Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/mm/page_alloc.c | |
3 | * | |
4 | * Manages the free list, the system allocates free pages here. | |
5 | * Note that kmalloc() lives in slab.c | |
6 | * | |
7 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
8 | * Swap reorganised 29.12.95, Stephen Tweedie | |
9 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
10 | * Reshaped it to be a zoned allocator, Ingo Molnar, Red Hat, 1999 | |
11 | * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999 | |
12 | * Zone balancing, Kanoj Sarcar, SGI, Jan 2000 | |
13 | * Per cpu hot/cold page lists, bulk allocation, Martin J. Bligh, Sept 2002 | |
14 | * (lots of bits borrowed from Ingo Molnar & Andrew Morton) | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/stddef.h> |
18 | #include <linux/mm.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/pagemap.h> | |
10ed273f | 22 | #include <linux/jiffies.h> |
1da177e4 | 23 | #include <linux/bootmem.h> |
edbe7d23 | 24 | #include <linux/memblock.h> |
1da177e4 | 25 | #include <linux/compiler.h> |
9f158333 | 26 | #include <linux/kernel.h> |
b1eeab67 | 27 | #include <linux/kmemcheck.h> |
b8c73fc2 | 28 | #include <linux/kasan.h> |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | #include <linux/suspend.h> | |
31 | #include <linux/pagevec.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <linux/slab.h> | |
a238ab5b | 34 | #include <linux/ratelimit.h> |
5a3135c2 | 35 | #include <linux/oom.h> |
1da177e4 LT |
36 | #include <linux/notifier.h> |
37 | #include <linux/topology.h> | |
38 | #include <linux/sysctl.h> | |
39 | #include <linux/cpu.h> | |
40 | #include <linux/cpuset.h> | |
bdc8cb98 | 41 | #include <linux/memory_hotplug.h> |
1da177e4 LT |
42 | #include <linux/nodemask.h> |
43 | #include <linux/vmalloc.h> | |
a6cccdc3 | 44 | #include <linux/vmstat.h> |
4be38e35 | 45 | #include <linux/mempolicy.h> |
4b94ffdc | 46 | #include <linux/memremap.h> |
6811378e | 47 | #include <linux/stop_machine.h> |
c713216d MG |
48 | #include <linux/sort.h> |
49 | #include <linux/pfn.h> | |
3fcfab16 | 50 | #include <linux/backing-dev.h> |
933e312e | 51 | #include <linux/fault-inject.h> |
a5d76b54 | 52 | #include <linux/page-isolation.h> |
eefa864b | 53 | #include <linux/page_ext.h> |
3ac7fe5a | 54 | #include <linux/debugobjects.h> |
dbb1f81c | 55 | #include <linux/kmemleak.h> |
56de7263 | 56 | #include <linux/compaction.h> |
0d3d062a | 57 | #include <trace/events/kmem.h> |
268bb0ce | 58 | #include <linux/prefetch.h> |
6e543d57 | 59 | #include <linux/mm_inline.h> |
041d3a8c | 60 | #include <linux/migrate.h> |
e30825f1 | 61 | #include <linux/page_ext.h> |
949f7ec5 | 62 | #include <linux/hugetlb.h> |
8bd75c77 | 63 | #include <linux/sched/rt.h> |
48c96a36 | 64 | #include <linux/page_owner.h> |
0e1cc95b | 65 | #include <linux/kthread.h> |
4949148a | 66 | #include <linux/memcontrol.h> |
1da177e4 | 67 | |
7ee3d4e8 | 68 | #include <asm/sections.h> |
1da177e4 | 69 | #include <asm/tlbflush.h> |
ac924c60 | 70 | #include <asm/div64.h> |
1da177e4 LT |
71 | #include "internal.h" |
72 | ||
c8e251fa CS |
73 | /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ |
74 | static DEFINE_MUTEX(pcp_batch_high_lock); | |
7cd2b0a3 | 75 | #define MIN_PERCPU_PAGELIST_FRACTION (8) |
c8e251fa | 76 | |
72812019 LS |
77 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
78 | DEFINE_PER_CPU(int, numa_node); | |
79 | EXPORT_PER_CPU_SYMBOL(numa_node); | |
80 | #endif | |
81 | ||
7aac7898 LS |
82 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
83 | /* | |
84 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
85 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
86 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem() | |
87 | * defined in <linux/topology.h>. | |
88 | */ | |
89 | DEFINE_PER_CPU(int, _numa_mem_); /* Kernel "local memory" node */ | |
90 | EXPORT_PER_CPU_SYMBOL(_numa_mem_); | |
ad2c8144 | 91 | int _node_numa_mem_[MAX_NUMNODES]; |
7aac7898 LS |
92 | #endif |
93 | ||
1da177e4 | 94 | /* |
13808910 | 95 | * Array of node states. |
1da177e4 | 96 | */ |
13808910 CL |
97 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
98 | [N_POSSIBLE] = NODE_MASK_ALL, | |
99 | [N_ONLINE] = { { [0] = 1UL } }, | |
100 | #ifndef CONFIG_NUMA | |
101 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
102 | #ifdef CONFIG_HIGHMEM | |
103 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
20b2f52b LJ |
104 | #endif |
105 | #ifdef CONFIG_MOVABLE_NODE | |
106 | [N_MEMORY] = { { [0] = 1UL } }, | |
13808910 CL |
107 | #endif |
108 | [N_CPU] = { { [0] = 1UL } }, | |
109 | #endif /* NUMA */ | |
110 | }; | |
111 | EXPORT_SYMBOL(node_states); | |
112 | ||
c3d5f5f0 JL |
113 | /* Protect totalram_pages and zone->managed_pages */ |
114 | static DEFINE_SPINLOCK(managed_page_count_lock); | |
115 | ||
6c231b7b | 116 | unsigned long totalram_pages __read_mostly; |
cb45b0e9 | 117 | unsigned long totalreserve_pages __read_mostly; |
e48322ab | 118 | unsigned long totalcma_pages __read_mostly; |
ab8fabd4 | 119 | |
1b76b02f | 120 | int percpu_pagelist_fraction; |
dcce284a | 121 | gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; |
1da177e4 | 122 | |
bb14c2c7 VB |
123 | /* |
124 | * A cached value of the page's pageblock's migratetype, used when the page is | |
125 | * put on a pcplist. Used to avoid the pageblock migratetype lookup when | |
126 | * freeing from pcplists in most cases, at the cost of possibly becoming stale. | |
127 | * Also the migratetype set in the page does not necessarily match the pcplist | |
128 | * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any | |
129 | * other index - this ensures that it will be put on the correct CMA freelist. | |
130 | */ | |
131 | static inline int get_pcppage_migratetype(struct page *page) | |
132 | { | |
133 | return page->index; | |
134 | } | |
135 | ||
136 | static inline void set_pcppage_migratetype(struct page *page, int migratetype) | |
137 | { | |
138 | page->index = migratetype; | |
139 | } | |
140 | ||
452aa699 RW |
141 | #ifdef CONFIG_PM_SLEEP |
142 | /* | |
143 | * The following functions are used by the suspend/hibernate code to temporarily | |
144 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations | |
145 | * while devices are suspended. To avoid races with the suspend/hibernate code, | |
146 | * they should always be called with pm_mutex held (gfp_allowed_mask also should | |
147 | * only be modified with pm_mutex held, unless the suspend/hibernate code is | |
148 | * guaranteed not to run in parallel with that modification). | |
149 | */ | |
c9e664f1 RW |
150 | |
151 | static gfp_t saved_gfp_mask; | |
152 | ||
153 | void pm_restore_gfp_mask(void) | |
452aa699 RW |
154 | { |
155 | WARN_ON(!mutex_is_locked(&pm_mutex)); | |
c9e664f1 RW |
156 | if (saved_gfp_mask) { |
157 | gfp_allowed_mask = saved_gfp_mask; | |
158 | saved_gfp_mask = 0; | |
159 | } | |
452aa699 RW |
160 | } |
161 | ||
c9e664f1 | 162 | void pm_restrict_gfp_mask(void) |
452aa699 | 163 | { |
452aa699 | 164 | WARN_ON(!mutex_is_locked(&pm_mutex)); |
c9e664f1 RW |
165 | WARN_ON(saved_gfp_mask); |
166 | saved_gfp_mask = gfp_allowed_mask; | |
d0164adc | 167 | gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS); |
452aa699 | 168 | } |
f90ac398 MG |
169 | |
170 | bool pm_suspended_storage(void) | |
171 | { | |
d0164adc | 172 | if ((gfp_allowed_mask & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) |
f90ac398 MG |
173 | return false; |
174 | return true; | |
175 | } | |
452aa699 RW |
176 | #endif /* CONFIG_PM_SLEEP */ |
177 | ||
d9c23400 | 178 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
d00181b9 | 179 | unsigned int pageblock_order __read_mostly; |
d9c23400 MG |
180 | #endif |
181 | ||
d98c7a09 | 182 | static void __free_pages_ok(struct page *page, unsigned int order); |
a226f6c8 | 183 | |
1da177e4 LT |
184 | /* |
185 | * results with 256, 32 in the lowmem_reserve sysctl: | |
186 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
187 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
188 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
189 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
84109e15 | 190 | * HIGHMEM allocation will leave (224M+784M)/256 of ram reserved in ZONE_DMA |
a2f1b424 AK |
191 | * |
192 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
193 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 194 | */ |
2f1b6248 | 195 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { |
4b51d669 | 196 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 197 | 256, |
4b51d669 | 198 | #endif |
fb0e7942 | 199 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 200 | 256, |
fb0e7942 | 201 | #endif |
e53ef38d | 202 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 203 | 32, |
e53ef38d | 204 | #endif |
2a1e274a | 205 | 32, |
2f1b6248 | 206 | }; |
1da177e4 LT |
207 | |
208 | EXPORT_SYMBOL(totalram_pages); | |
1da177e4 | 209 | |
15ad7cdc | 210 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 211 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 212 | "DMA", |
4b51d669 | 213 | #endif |
fb0e7942 | 214 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 215 | "DMA32", |
fb0e7942 | 216 | #endif |
2f1b6248 | 217 | "Normal", |
e53ef38d | 218 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 219 | "HighMem", |
e53ef38d | 220 | #endif |
2a1e274a | 221 | "Movable", |
033fbae9 DW |
222 | #ifdef CONFIG_ZONE_DEVICE |
223 | "Device", | |
224 | #endif | |
2f1b6248 CL |
225 | }; |
226 | ||
60f30350 VB |
227 | char * const migratetype_names[MIGRATE_TYPES] = { |
228 | "Unmovable", | |
229 | "Movable", | |
230 | "Reclaimable", | |
231 | "HighAtomic", | |
232 | #ifdef CONFIG_CMA | |
233 | "CMA", | |
234 | #endif | |
235 | #ifdef CONFIG_MEMORY_ISOLATION | |
236 | "Isolate", | |
237 | #endif | |
238 | }; | |
239 | ||
f1e61557 KS |
240 | compound_page_dtor * const compound_page_dtors[] = { |
241 | NULL, | |
242 | free_compound_page, | |
243 | #ifdef CONFIG_HUGETLB_PAGE | |
244 | free_huge_page, | |
245 | #endif | |
9a982250 KS |
246 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
247 | free_transhuge_page, | |
248 | #endif | |
f1e61557 KS |
249 | }; |
250 | ||
1da177e4 | 251 | int min_free_kbytes = 1024; |
42aa83cb | 252 | int user_min_free_kbytes = -1; |
795ae7a0 | 253 | int watermark_scale_factor = 10; |
1da177e4 | 254 | |
2c85f51d JB |
255 | static unsigned long __meminitdata nr_kernel_pages; |
256 | static unsigned long __meminitdata nr_all_pages; | |
a3142c8e | 257 | static unsigned long __meminitdata dma_reserve; |
1da177e4 | 258 | |
0ee332c1 TH |
259 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
260 | static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES]; | |
261 | static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; | |
262 | static unsigned long __initdata required_kernelcore; | |
263 | static unsigned long __initdata required_movablecore; | |
264 | static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; | |
342332e6 | 265 | static bool mirrored_kernelcore; |
0ee332c1 TH |
266 | |
267 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
268 | int movable_zone; | |
269 | EXPORT_SYMBOL(movable_zone); | |
270 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ | |
c713216d | 271 | |
418508c1 MS |
272 | #if MAX_NUMNODES > 1 |
273 | int nr_node_ids __read_mostly = MAX_NUMNODES; | |
62bc62a8 | 274 | int nr_online_nodes __read_mostly = 1; |
418508c1 | 275 | EXPORT_SYMBOL(nr_node_ids); |
62bc62a8 | 276 | EXPORT_SYMBOL(nr_online_nodes); |
418508c1 MS |
277 | #endif |
278 | ||
9ef9acb0 MG |
279 | int page_group_by_mobility_disabled __read_mostly; |
280 | ||
3a80a7fa MG |
281 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
282 | static inline void reset_deferred_meminit(pg_data_t *pgdat) | |
283 | { | |
284 | pgdat->first_deferred_pfn = ULONG_MAX; | |
285 | } | |
286 | ||
287 | /* Returns true if the struct page for the pfn is uninitialised */ | |
0e1cc95b | 288 | static inline bool __meminit early_page_uninitialised(unsigned long pfn) |
3a80a7fa | 289 | { |
ef70b6f4 MG |
290 | int nid = early_pfn_to_nid(pfn); |
291 | ||
292 | if (node_online(nid) && pfn >= NODE_DATA(nid)->first_deferred_pfn) | |
3a80a7fa MG |
293 | return true; |
294 | ||
295 | return false; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Returns false when the remaining initialisation should be deferred until | |
300 | * later in the boot cycle when it can be parallelised. | |
301 | */ | |
302 | static inline bool update_defer_init(pg_data_t *pgdat, | |
303 | unsigned long pfn, unsigned long zone_end, | |
304 | unsigned long *nr_initialised) | |
305 | { | |
987b3095 LZ |
306 | unsigned long max_initialise; |
307 | ||
3a80a7fa MG |
308 | /* Always populate low zones for address-contrained allocations */ |
309 | if (zone_end < pgdat_end_pfn(pgdat)) | |
310 | return true; | |
987b3095 LZ |
311 | /* |
312 | * Initialise at least 2G of a node but also take into account that | |
313 | * two large system hashes that can take up 1GB for 0.25TB/node. | |
314 | */ | |
315 | max_initialise = max(2UL << (30 - PAGE_SHIFT), | |
316 | (pgdat->node_spanned_pages >> 8)); | |
3a80a7fa | 317 | |
3a80a7fa | 318 | (*nr_initialised)++; |
987b3095 | 319 | if ((*nr_initialised > max_initialise) && |
3a80a7fa MG |
320 | (pfn & (PAGES_PER_SECTION - 1)) == 0) { |
321 | pgdat->first_deferred_pfn = pfn; | |
322 | return false; | |
323 | } | |
324 | ||
325 | return true; | |
326 | } | |
327 | #else | |
328 | static inline void reset_deferred_meminit(pg_data_t *pgdat) | |
329 | { | |
330 | } | |
331 | ||
332 | static inline bool early_page_uninitialised(unsigned long pfn) | |
333 | { | |
334 | return false; | |
335 | } | |
336 | ||
337 | static inline bool update_defer_init(pg_data_t *pgdat, | |
338 | unsigned long pfn, unsigned long zone_end, | |
339 | unsigned long *nr_initialised) | |
340 | { | |
341 | return true; | |
342 | } | |
343 | #endif | |
344 | ||
0b423ca2 MG |
345 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
346 | static inline unsigned long *get_pageblock_bitmap(struct page *page, | |
347 | unsigned long pfn) | |
348 | { | |
349 | #ifdef CONFIG_SPARSEMEM | |
350 | return __pfn_to_section(pfn)->pageblock_flags; | |
351 | #else | |
352 | return page_zone(page)->pageblock_flags; | |
353 | #endif /* CONFIG_SPARSEMEM */ | |
354 | } | |
355 | ||
356 | static inline int pfn_to_bitidx(struct page *page, unsigned long pfn) | |
357 | { | |
358 | #ifdef CONFIG_SPARSEMEM | |
359 | pfn &= (PAGES_PER_SECTION-1); | |
360 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; | |
361 | #else | |
362 | pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages); | |
363 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; | |
364 | #endif /* CONFIG_SPARSEMEM */ | |
365 | } | |
366 | ||
367 | /** | |
368 | * get_pfnblock_flags_mask - Return the requested group of flags for the pageblock_nr_pages block of pages | |
369 | * @page: The page within the block of interest | |
370 | * @pfn: The target page frame number | |
371 | * @end_bitidx: The last bit of interest to retrieve | |
372 | * @mask: mask of bits that the caller is interested in | |
373 | * | |
374 | * Return: pageblock_bits flags | |
375 | */ | |
376 | static __always_inline unsigned long __get_pfnblock_flags_mask(struct page *page, | |
377 | unsigned long pfn, | |
378 | unsigned long end_bitidx, | |
379 | unsigned long mask) | |
380 | { | |
381 | unsigned long *bitmap; | |
382 | unsigned long bitidx, word_bitidx; | |
383 | unsigned long word; | |
384 | ||
385 | bitmap = get_pageblock_bitmap(page, pfn); | |
386 | bitidx = pfn_to_bitidx(page, pfn); | |
387 | word_bitidx = bitidx / BITS_PER_LONG; | |
388 | bitidx &= (BITS_PER_LONG-1); | |
389 | ||
390 | word = bitmap[word_bitidx]; | |
391 | bitidx += end_bitidx; | |
392 | return (word >> (BITS_PER_LONG - bitidx - 1)) & mask; | |
393 | } | |
394 | ||
395 | unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn, | |
396 | unsigned long end_bitidx, | |
397 | unsigned long mask) | |
398 | { | |
399 | return __get_pfnblock_flags_mask(page, pfn, end_bitidx, mask); | |
400 | } | |
401 | ||
402 | static __always_inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn) | |
403 | { | |
404 | return __get_pfnblock_flags_mask(page, pfn, PB_migrate_end, MIGRATETYPE_MASK); | |
405 | } | |
406 | ||
407 | /** | |
408 | * set_pfnblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages | |
409 | * @page: The page within the block of interest | |
410 | * @flags: The flags to set | |
411 | * @pfn: The target page frame number | |
412 | * @end_bitidx: The last bit of interest | |
413 | * @mask: mask of bits that the caller is interested in | |
414 | */ | |
415 | void set_pfnblock_flags_mask(struct page *page, unsigned long flags, | |
416 | unsigned long pfn, | |
417 | unsigned long end_bitidx, | |
418 | unsigned long mask) | |
419 | { | |
420 | unsigned long *bitmap; | |
421 | unsigned long bitidx, word_bitidx; | |
422 | unsigned long old_word, word; | |
423 | ||
424 | BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); | |
425 | ||
426 | bitmap = get_pageblock_bitmap(page, pfn); | |
427 | bitidx = pfn_to_bitidx(page, pfn); | |
428 | word_bitidx = bitidx / BITS_PER_LONG; | |
429 | bitidx &= (BITS_PER_LONG-1); | |
430 | ||
431 | VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page); | |
432 | ||
433 | bitidx += end_bitidx; | |
434 | mask <<= (BITS_PER_LONG - bitidx - 1); | |
435 | flags <<= (BITS_PER_LONG - bitidx - 1); | |
436 | ||
437 | word = READ_ONCE(bitmap[word_bitidx]); | |
438 | for (;;) { | |
439 | old_word = cmpxchg(&bitmap[word_bitidx], word, (word & ~mask) | flags); | |
440 | if (word == old_word) | |
441 | break; | |
442 | word = old_word; | |
443 | } | |
444 | } | |
3a80a7fa | 445 | |
ee6f509c | 446 | void set_pageblock_migratetype(struct page *page, int migratetype) |
b2a0ac88 | 447 | { |
5d0f3f72 KM |
448 | if (unlikely(page_group_by_mobility_disabled && |
449 | migratetype < MIGRATE_PCPTYPES)) | |
49255c61 MG |
450 | migratetype = MIGRATE_UNMOVABLE; |
451 | ||
b2a0ac88 MG |
452 | set_pageblock_flags_group(page, (unsigned long)migratetype, |
453 | PB_migrate, PB_migrate_end); | |
454 | } | |
455 | ||
13e7444b | 456 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 457 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 458 | { |
bdc8cb98 DH |
459 | int ret = 0; |
460 | unsigned seq; | |
461 | unsigned long pfn = page_to_pfn(page); | |
b5e6a5a2 | 462 | unsigned long sp, start_pfn; |
c6a57e19 | 463 | |
bdc8cb98 DH |
464 | do { |
465 | seq = zone_span_seqbegin(zone); | |
b5e6a5a2 CS |
466 | start_pfn = zone->zone_start_pfn; |
467 | sp = zone->spanned_pages; | |
108bcc96 | 468 | if (!zone_spans_pfn(zone, pfn)) |
bdc8cb98 DH |
469 | ret = 1; |
470 | } while (zone_span_seqretry(zone, seq)); | |
471 | ||
b5e6a5a2 | 472 | if (ret) |
613813e8 DH |
473 | pr_err("page 0x%lx outside node %d zone %s [ 0x%lx - 0x%lx ]\n", |
474 | pfn, zone_to_nid(zone), zone->name, | |
475 | start_pfn, start_pfn + sp); | |
b5e6a5a2 | 476 | |
bdc8cb98 | 477 | return ret; |
c6a57e19 DH |
478 | } |
479 | ||
480 | static int page_is_consistent(struct zone *zone, struct page *page) | |
481 | { | |
14e07298 | 482 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 483 | return 0; |
1da177e4 | 484 | if (zone != page_zone(page)) |
c6a57e19 DH |
485 | return 0; |
486 | ||
487 | return 1; | |
488 | } | |
489 | /* | |
490 | * Temporary debugging check for pages not lying within a given zone. | |
491 | */ | |
492 | static int bad_range(struct zone *zone, struct page *page) | |
493 | { | |
494 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 495 | return 1; |
c6a57e19 DH |
496 | if (!page_is_consistent(zone, page)) |
497 | return 1; | |
498 | ||
1da177e4 LT |
499 | return 0; |
500 | } | |
13e7444b NP |
501 | #else |
502 | static inline int bad_range(struct zone *zone, struct page *page) | |
503 | { | |
504 | return 0; | |
505 | } | |
506 | #endif | |
507 | ||
d230dec1 KS |
508 | static void bad_page(struct page *page, const char *reason, |
509 | unsigned long bad_flags) | |
1da177e4 | 510 | { |
d936cf9b HD |
511 | static unsigned long resume; |
512 | static unsigned long nr_shown; | |
513 | static unsigned long nr_unshown; | |
514 | ||
515 | /* | |
516 | * Allow a burst of 60 reports, then keep quiet for that minute; | |
517 | * or allow a steady drip of one report per second. | |
518 | */ | |
519 | if (nr_shown == 60) { | |
520 | if (time_before(jiffies, resume)) { | |
521 | nr_unshown++; | |
522 | goto out; | |
523 | } | |
524 | if (nr_unshown) { | |
ff8e8116 | 525 | pr_alert( |
1e9e6365 | 526 | "BUG: Bad page state: %lu messages suppressed\n", |
d936cf9b HD |
527 | nr_unshown); |
528 | nr_unshown = 0; | |
529 | } | |
530 | nr_shown = 0; | |
531 | } | |
532 | if (nr_shown++ == 0) | |
533 | resume = jiffies + 60 * HZ; | |
534 | ||
ff8e8116 | 535 | pr_alert("BUG: Bad page state in process %s pfn:%05lx\n", |
3dc14741 | 536 | current->comm, page_to_pfn(page)); |
ff8e8116 VB |
537 | __dump_page(page, reason); |
538 | bad_flags &= page->flags; | |
539 | if (bad_flags) | |
540 | pr_alert("bad because of flags: %#lx(%pGp)\n", | |
541 | bad_flags, &bad_flags); | |
4e462112 | 542 | dump_page_owner(page); |
3dc14741 | 543 | |
4f31888c | 544 | print_modules(); |
1da177e4 | 545 | dump_stack(); |
d936cf9b | 546 | out: |
8cc3b392 | 547 | /* Leave bad fields for debug, except PageBuddy could make trouble */ |
22b751c3 | 548 | page_mapcount_reset(page); /* remove PageBuddy */ |
373d4d09 | 549 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
550 | } |
551 | ||
1da177e4 LT |
552 | /* |
553 | * Higher-order pages are called "compound pages". They are structured thusly: | |
554 | * | |
1d798ca3 | 555 | * The first PAGE_SIZE page is called the "head page" and have PG_head set. |
1da177e4 | 556 | * |
1d798ca3 KS |
557 | * The remaining PAGE_SIZE pages are called "tail pages". PageTail() is encoded |
558 | * in bit 0 of page->compound_head. The rest of bits is pointer to head page. | |
1da177e4 | 559 | * |
1d798ca3 KS |
560 | * The first tail page's ->compound_dtor holds the offset in array of compound |
561 | * page destructors. See compound_page_dtors. | |
1da177e4 | 562 | * |
1d798ca3 | 563 | * The first tail page's ->compound_order holds the order of allocation. |
41d78ba5 | 564 | * This usage means that zero-order pages may not be compound. |
1da177e4 | 565 | */ |
d98c7a09 | 566 | |
9a982250 | 567 | void free_compound_page(struct page *page) |
d98c7a09 | 568 | { |
d85f3385 | 569 | __free_pages_ok(page, compound_order(page)); |
d98c7a09 HD |
570 | } |
571 | ||
d00181b9 | 572 | void prep_compound_page(struct page *page, unsigned int order) |
18229df5 AW |
573 | { |
574 | int i; | |
575 | int nr_pages = 1 << order; | |
576 | ||
f1e61557 | 577 | set_compound_page_dtor(page, COMPOUND_PAGE_DTOR); |
18229df5 AW |
578 | set_compound_order(page, order); |
579 | __SetPageHead(page); | |
580 | for (i = 1; i < nr_pages; i++) { | |
581 | struct page *p = page + i; | |
58a84aa9 | 582 | set_page_count(p, 0); |
1c290f64 | 583 | p->mapping = TAIL_MAPPING; |
1d798ca3 | 584 | set_compound_head(p, page); |
18229df5 | 585 | } |
53f9263b | 586 | atomic_set(compound_mapcount_ptr(page), -1); |
18229df5 AW |
587 | } |
588 | ||
c0a32fc5 SG |
589 | #ifdef CONFIG_DEBUG_PAGEALLOC |
590 | unsigned int _debug_guardpage_minorder; | |
ea6eabb0 CB |
591 | bool _debug_pagealloc_enabled __read_mostly |
592 | = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); | |
505f6d22 | 593 | EXPORT_SYMBOL(_debug_pagealloc_enabled); |
e30825f1 JK |
594 | bool _debug_guardpage_enabled __read_mostly; |
595 | ||
031bc574 JK |
596 | static int __init early_debug_pagealloc(char *buf) |
597 | { | |
598 | if (!buf) | |
599 | return -EINVAL; | |
2a138dc7 | 600 | return kstrtobool(buf, &_debug_pagealloc_enabled); |
031bc574 JK |
601 | } |
602 | early_param("debug_pagealloc", early_debug_pagealloc); | |
603 | ||
e30825f1 JK |
604 | static bool need_debug_guardpage(void) |
605 | { | |
031bc574 JK |
606 | /* If we don't use debug_pagealloc, we don't need guard page */ |
607 | if (!debug_pagealloc_enabled()) | |
608 | return false; | |
609 | ||
e30825f1 JK |
610 | return true; |
611 | } | |
612 | ||
613 | static void init_debug_guardpage(void) | |
614 | { | |
031bc574 JK |
615 | if (!debug_pagealloc_enabled()) |
616 | return; | |
617 | ||
e30825f1 JK |
618 | _debug_guardpage_enabled = true; |
619 | } | |
620 | ||
621 | struct page_ext_operations debug_guardpage_ops = { | |
622 | .need = need_debug_guardpage, | |
623 | .init = init_debug_guardpage, | |
624 | }; | |
c0a32fc5 SG |
625 | |
626 | static int __init debug_guardpage_minorder_setup(char *buf) | |
627 | { | |
628 | unsigned long res; | |
629 | ||
630 | if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { | |
1170532b | 631 | pr_err("Bad debug_guardpage_minorder value\n"); |
c0a32fc5 SG |
632 | return 0; |
633 | } | |
634 | _debug_guardpage_minorder = res; | |
1170532b | 635 | pr_info("Setting debug_guardpage_minorder to %lu\n", res); |
c0a32fc5 SG |
636 | return 0; |
637 | } | |
638 | __setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup); | |
639 | ||
2847cf95 JK |
640 | static inline void set_page_guard(struct zone *zone, struct page *page, |
641 | unsigned int order, int migratetype) | |
c0a32fc5 | 642 | { |
e30825f1 JK |
643 | struct page_ext *page_ext; |
644 | ||
645 | if (!debug_guardpage_enabled()) | |
646 | return; | |
647 | ||
648 | page_ext = lookup_page_ext(page); | |
f86e4271 YS |
649 | if (unlikely(!page_ext)) |
650 | return; | |
651 | ||
e30825f1 JK |
652 | __set_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); |
653 | ||
2847cf95 JK |
654 | INIT_LIST_HEAD(&page->lru); |
655 | set_page_private(page, order); | |
656 | /* Guard pages are not available for any usage */ | |
657 | __mod_zone_freepage_state(zone, -(1 << order), migratetype); | |
c0a32fc5 SG |
658 | } |
659 | ||
2847cf95 JK |
660 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
661 | unsigned int order, int migratetype) | |
c0a32fc5 | 662 | { |
e30825f1 JK |
663 | struct page_ext *page_ext; |
664 | ||
665 | if (!debug_guardpage_enabled()) | |
666 | return; | |
667 | ||
668 | page_ext = lookup_page_ext(page); | |
f86e4271 YS |
669 | if (unlikely(!page_ext)) |
670 | return; | |
671 | ||
e30825f1 JK |
672 | __clear_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); |
673 | ||
2847cf95 JK |
674 | set_page_private(page, 0); |
675 | if (!is_migrate_isolate(migratetype)) | |
676 | __mod_zone_freepage_state(zone, (1 << order), migratetype); | |
c0a32fc5 SG |
677 | } |
678 | #else | |
e30825f1 | 679 | struct page_ext_operations debug_guardpage_ops = { NULL, }; |
2847cf95 JK |
680 | static inline void set_page_guard(struct zone *zone, struct page *page, |
681 | unsigned int order, int migratetype) {} | |
682 | static inline void clear_page_guard(struct zone *zone, struct page *page, | |
683 | unsigned int order, int migratetype) {} | |
c0a32fc5 SG |
684 | #endif |
685 | ||
7aeb09f9 | 686 | static inline void set_page_order(struct page *page, unsigned int order) |
6aa3001b | 687 | { |
4c21e2f2 | 688 | set_page_private(page, order); |
676165a8 | 689 | __SetPageBuddy(page); |
1da177e4 LT |
690 | } |
691 | ||
692 | static inline void rmv_page_order(struct page *page) | |
693 | { | |
676165a8 | 694 | __ClearPageBuddy(page); |
4c21e2f2 | 695 | set_page_private(page, 0); |
1da177e4 LT |
696 | } |
697 | ||
1da177e4 LT |
698 | /* |
699 | * This function checks whether a page is free && is the buddy | |
700 | * we can do coalesce a page and its buddy if | |
13e7444b | 701 | * (a) the buddy is not in a hole && |
676165a8 | 702 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
703 | * (c) a page and its buddy have the same order && |
704 | * (d) a page and its buddy are in the same zone. | |
676165a8 | 705 | * |
cf6fe945 WSH |
706 | * For recording whether a page is in the buddy system, we set ->_mapcount |
707 | * PAGE_BUDDY_MAPCOUNT_VALUE. | |
708 | * Setting, clearing, and testing _mapcount PAGE_BUDDY_MAPCOUNT_VALUE is | |
709 | * serialized by zone->lock. | |
1da177e4 | 710 | * |
676165a8 | 711 | * For recording page's order, we use page_private(page). |
1da177e4 | 712 | */ |
cb2b95e1 | 713 | static inline int page_is_buddy(struct page *page, struct page *buddy, |
7aeb09f9 | 714 | unsigned int order) |
1da177e4 | 715 | { |
14e07298 | 716 | if (!pfn_valid_within(page_to_pfn(buddy))) |
13e7444b | 717 | return 0; |
13e7444b | 718 | |
c0a32fc5 | 719 | if (page_is_guard(buddy) && page_order(buddy) == order) { |
d34c5fa0 MG |
720 | if (page_zone_id(page) != page_zone_id(buddy)) |
721 | return 0; | |
722 | ||
4c5018ce WY |
723 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
724 | ||
c0a32fc5 SG |
725 | return 1; |
726 | } | |
727 | ||
cb2b95e1 | 728 | if (PageBuddy(buddy) && page_order(buddy) == order) { |
d34c5fa0 MG |
729 | /* |
730 | * zone check is done late to avoid uselessly | |
731 | * calculating zone/node ids for pages that could | |
732 | * never merge. | |
733 | */ | |
734 | if (page_zone_id(page) != page_zone_id(buddy)) | |
735 | return 0; | |
736 | ||
4c5018ce WY |
737 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
738 | ||
6aa3001b | 739 | return 1; |
676165a8 | 740 | } |
6aa3001b | 741 | return 0; |
1da177e4 LT |
742 | } |
743 | ||
744 | /* | |
745 | * Freeing function for a buddy system allocator. | |
746 | * | |
747 | * The concept of a buddy system is to maintain direct-mapped table | |
748 | * (containing bit values) for memory blocks of various "orders". | |
749 | * The bottom level table contains the map for the smallest allocatable | |
750 | * units of memory (here, pages), and each level above it describes | |
751 | * pairs of units from the levels below, hence, "buddies". | |
752 | * At a high level, all that happens here is marking the table entry | |
753 | * at the bottom level available, and propagating the changes upward | |
754 | * as necessary, plus some accounting needed to play nicely with other | |
755 | * parts of the VM system. | |
756 | * At each level, we keep a list of pages, which are heads of continuous | |
cf6fe945 WSH |
757 | * free pages of length of (1 << order) and marked with _mapcount |
758 | * PAGE_BUDDY_MAPCOUNT_VALUE. Page's order is recorded in page_private(page) | |
759 | * field. | |
1da177e4 | 760 | * So when we are allocating or freeing one, we can derive the state of the |
5f63b720 MN |
761 | * other. That is, if we allocate a small block, and both were |
762 | * free, the remainder of the region must be split into blocks. | |
1da177e4 | 763 | * If a block is freed, and its buddy is also free, then this |
5f63b720 | 764 | * triggers coalescing into a block of larger size. |
1da177e4 | 765 | * |
6d49e352 | 766 | * -- nyc |
1da177e4 LT |
767 | */ |
768 | ||
48db57f8 | 769 | static inline void __free_one_page(struct page *page, |
dc4b0caf | 770 | unsigned long pfn, |
ed0ae21d MG |
771 | struct zone *zone, unsigned int order, |
772 | int migratetype) | |
1da177e4 LT |
773 | { |
774 | unsigned long page_idx; | |
6dda9d55 | 775 | unsigned long combined_idx; |
43506fad | 776 | unsigned long uninitialized_var(buddy_idx); |
6dda9d55 | 777 | struct page *buddy; |
d9dddbf5 VB |
778 | unsigned int max_order; |
779 | ||
780 | max_order = min_t(unsigned int, MAX_ORDER, pageblock_order + 1); | |
1da177e4 | 781 | |
d29bb978 | 782 | VM_BUG_ON(!zone_is_initialized(zone)); |
6e9f0d58 | 783 | VM_BUG_ON_PAGE(page->flags & PAGE_FLAGS_CHECK_AT_PREP, page); |
1da177e4 | 784 | |
ed0ae21d | 785 | VM_BUG_ON(migratetype == -1); |
d9dddbf5 | 786 | if (likely(!is_migrate_isolate(migratetype))) |
8f82b55d | 787 | __mod_zone_freepage_state(zone, 1 << order, migratetype); |
ed0ae21d | 788 | |
d9dddbf5 | 789 | page_idx = pfn & ((1 << MAX_ORDER) - 1); |
1da177e4 | 790 | |
309381fe SL |
791 | VM_BUG_ON_PAGE(page_idx & ((1 << order) - 1), page); |
792 | VM_BUG_ON_PAGE(bad_range(zone, page), page); | |
1da177e4 | 793 | |
d9dddbf5 | 794 | continue_merging: |
3c605096 | 795 | while (order < max_order - 1) { |
43506fad KC |
796 | buddy_idx = __find_buddy_index(page_idx, order); |
797 | buddy = page + (buddy_idx - page_idx); | |
cb2b95e1 | 798 | if (!page_is_buddy(page, buddy, order)) |
d9dddbf5 | 799 | goto done_merging; |
c0a32fc5 SG |
800 | /* |
801 | * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, | |
802 | * merge with it and move up one order. | |
803 | */ | |
804 | if (page_is_guard(buddy)) { | |
2847cf95 | 805 | clear_page_guard(zone, buddy, order, migratetype); |
c0a32fc5 SG |
806 | } else { |
807 | list_del(&buddy->lru); | |
808 | zone->free_area[order].nr_free--; | |
809 | rmv_page_order(buddy); | |
810 | } | |
43506fad | 811 | combined_idx = buddy_idx & page_idx; |
1da177e4 LT |
812 | page = page + (combined_idx - page_idx); |
813 | page_idx = combined_idx; | |
814 | order++; | |
815 | } | |
d9dddbf5 VB |
816 | if (max_order < MAX_ORDER) { |
817 | /* If we are here, it means order is >= pageblock_order. | |
818 | * We want to prevent merge between freepages on isolate | |
819 | * pageblock and normal pageblock. Without this, pageblock | |
820 | * isolation could cause incorrect freepage or CMA accounting. | |
821 | * | |
822 | * We don't want to hit this code for the more frequent | |
823 | * low-order merging. | |
824 | */ | |
825 | if (unlikely(has_isolate_pageblock(zone))) { | |
826 | int buddy_mt; | |
827 | ||
828 | buddy_idx = __find_buddy_index(page_idx, order); | |
829 | buddy = page + (buddy_idx - page_idx); | |
830 | buddy_mt = get_pageblock_migratetype(buddy); | |
831 | ||
832 | if (migratetype != buddy_mt | |
833 | && (is_migrate_isolate(migratetype) || | |
834 | is_migrate_isolate(buddy_mt))) | |
835 | goto done_merging; | |
836 | } | |
837 | max_order++; | |
838 | goto continue_merging; | |
839 | } | |
840 | ||
841 | done_merging: | |
1da177e4 | 842 | set_page_order(page, order); |
6dda9d55 CZ |
843 | |
844 | /* | |
845 | * If this is not the largest possible page, check if the buddy | |
846 | * of the next-highest order is free. If it is, it's possible | |
847 | * that pages are being freed that will coalesce soon. In case, | |
848 | * that is happening, add the free page to the tail of the list | |
849 | * so it's less likely to be used soon and more likely to be merged | |
850 | * as a higher order page | |
851 | */ | |
b7f50cfa | 852 | if ((order < MAX_ORDER-2) && pfn_valid_within(page_to_pfn(buddy))) { |
6dda9d55 | 853 | struct page *higher_page, *higher_buddy; |
43506fad KC |
854 | combined_idx = buddy_idx & page_idx; |
855 | higher_page = page + (combined_idx - page_idx); | |
856 | buddy_idx = __find_buddy_index(combined_idx, order + 1); | |
0ba8f2d5 | 857 | higher_buddy = higher_page + (buddy_idx - combined_idx); |
6dda9d55 CZ |
858 | if (page_is_buddy(higher_page, higher_buddy, order + 1)) { |
859 | list_add_tail(&page->lru, | |
860 | &zone->free_area[order].free_list[migratetype]); | |
861 | goto out; | |
862 | } | |
863 | } | |
864 | ||
865 | list_add(&page->lru, &zone->free_area[order].free_list[migratetype]); | |
866 | out: | |
1da177e4 LT |
867 | zone->free_area[order].nr_free++; |
868 | } | |
869 | ||
7bfec6f4 MG |
870 | /* |
871 | * A bad page could be due to a number of fields. Instead of multiple branches, | |
872 | * try and check multiple fields with one check. The caller must do a detailed | |
873 | * check if necessary. | |
874 | */ | |
875 | static inline bool page_expected_state(struct page *page, | |
876 | unsigned long check_flags) | |
877 | { | |
878 | if (unlikely(atomic_read(&page->_mapcount) != -1)) | |
879 | return false; | |
880 | ||
881 | if (unlikely((unsigned long)page->mapping | | |
882 | page_ref_count(page) | | |
883 | #ifdef CONFIG_MEMCG | |
884 | (unsigned long)page->mem_cgroup | | |
885 | #endif | |
886 | (page->flags & check_flags))) | |
887 | return false; | |
888 | ||
889 | return true; | |
890 | } | |
891 | ||
bb552ac6 | 892 | static void free_pages_check_bad(struct page *page) |
1da177e4 | 893 | { |
7bfec6f4 MG |
894 | const char *bad_reason; |
895 | unsigned long bad_flags; | |
896 | ||
7bfec6f4 MG |
897 | bad_reason = NULL; |
898 | bad_flags = 0; | |
f0b791a3 | 899 | |
53f9263b | 900 | if (unlikely(atomic_read(&page->_mapcount) != -1)) |
f0b791a3 DH |
901 | bad_reason = "nonzero mapcount"; |
902 | if (unlikely(page->mapping != NULL)) | |
903 | bad_reason = "non-NULL mapping"; | |
fe896d18 | 904 | if (unlikely(page_ref_count(page) != 0)) |
0139aa7b | 905 | bad_reason = "nonzero _refcount"; |
f0b791a3 DH |
906 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE)) { |
907 | bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set"; | |
908 | bad_flags = PAGE_FLAGS_CHECK_AT_FREE; | |
909 | } | |
9edad6ea JW |
910 | #ifdef CONFIG_MEMCG |
911 | if (unlikely(page->mem_cgroup)) | |
912 | bad_reason = "page still charged to cgroup"; | |
913 | #endif | |
7bfec6f4 | 914 | bad_page(page, bad_reason, bad_flags); |
bb552ac6 MG |
915 | } |
916 | ||
917 | static inline int free_pages_check(struct page *page) | |
918 | { | |
da838d4f | 919 | if (likely(page_expected_state(page, PAGE_FLAGS_CHECK_AT_FREE))) |
bb552ac6 | 920 | return 0; |
bb552ac6 MG |
921 | |
922 | /* Something has gone sideways, find it */ | |
923 | free_pages_check_bad(page); | |
7bfec6f4 | 924 | return 1; |
1da177e4 LT |
925 | } |
926 | ||
4db7548c MG |
927 | static int free_tail_pages_check(struct page *head_page, struct page *page) |
928 | { | |
929 | int ret = 1; | |
930 | ||
931 | /* | |
932 | * We rely page->lru.next never has bit 0 set, unless the page | |
933 | * is PageTail(). Let's make sure that's true even for poisoned ->lru. | |
934 | */ | |
935 | BUILD_BUG_ON((unsigned long)LIST_POISON1 & 1); | |
936 | ||
937 | if (!IS_ENABLED(CONFIG_DEBUG_VM)) { | |
938 | ret = 0; | |
939 | goto out; | |
940 | } | |
941 | switch (page - head_page) { | |
942 | case 1: | |
943 | /* the first tail page: ->mapping is compound_mapcount() */ | |
944 | if (unlikely(compound_mapcount(page))) { | |
945 | bad_page(page, "nonzero compound_mapcount", 0); | |
946 | goto out; | |
947 | } | |
948 | break; | |
949 | case 2: | |
950 | /* | |
951 | * the second tail page: ->mapping is | |
952 | * page_deferred_list().next -- ignore value. | |
953 | */ | |
954 | break; | |
955 | default: | |
956 | if (page->mapping != TAIL_MAPPING) { | |
957 | bad_page(page, "corrupted mapping in tail page", 0); | |
958 | goto out; | |
959 | } | |
960 | break; | |
961 | } | |
962 | if (unlikely(!PageTail(page))) { | |
963 | bad_page(page, "PageTail not set", 0); | |
964 | goto out; | |
965 | } | |
966 | if (unlikely(compound_head(page) != head_page)) { | |
967 | bad_page(page, "compound_head not consistent", 0); | |
968 | goto out; | |
969 | } | |
970 | ret = 0; | |
971 | out: | |
972 | page->mapping = NULL; | |
973 | clear_compound_head(page); | |
974 | return ret; | |
975 | } | |
976 | ||
e2769dbd MG |
977 | static __always_inline bool free_pages_prepare(struct page *page, |
978 | unsigned int order, bool check_free) | |
4db7548c | 979 | { |
e2769dbd | 980 | int bad = 0; |
4db7548c | 981 | |
4db7548c MG |
982 | VM_BUG_ON_PAGE(PageTail(page), page); |
983 | ||
e2769dbd MG |
984 | trace_mm_page_free(page, order); |
985 | kmemcheck_free_shadow(page, order); | |
e2769dbd MG |
986 | |
987 | /* | |
988 | * Check tail pages before head page information is cleared to | |
989 | * avoid checking PageCompound for order-0 pages. | |
990 | */ | |
991 | if (unlikely(order)) { | |
992 | bool compound = PageCompound(page); | |
993 | int i; | |
994 | ||
995 | VM_BUG_ON_PAGE(compound && compound_order(page) != order, page); | |
4db7548c | 996 | |
9a73f61b KS |
997 | if (compound) |
998 | ClearPageDoubleMap(page); | |
e2769dbd MG |
999 | for (i = 1; i < (1 << order); i++) { |
1000 | if (compound) | |
1001 | bad += free_tail_pages_check(page, page + i); | |
1002 | if (unlikely(free_pages_check(page + i))) { | |
1003 | bad++; | |
1004 | continue; | |
1005 | } | |
1006 | (page + i)->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1007 | } | |
1008 | } | |
bda807d4 | 1009 | if (PageMappingFlags(page)) |
4db7548c | 1010 | page->mapping = NULL; |
4949148a VD |
1011 | if (memcg_kmem_enabled() && PageKmemcg(page)) { |
1012 | memcg_kmem_uncharge(page, order); | |
1013 | __ClearPageKmemcg(page); | |
1014 | } | |
e2769dbd MG |
1015 | if (check_free) |
1016 | bad += free_pages_check(page); | |
1017 | if (bad) | |
1018 | return false; | |
4db7548c | 1019 | |
e2769dbd MG |
1020 | page_cpupid_reset_last(page); |
1021 | page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1022 | reset_page_owner(page, order); | |
4db7548c MG |
1023 | |
1024 | if (!PageHighMem(page)) { | |
1025 | debug_check_no_locks_freed(page_address(page), | |
e2769dbd | 1026 | PAGE_SIZE << order); |
4db7548c | 1027 | debug_check_no_obj_freed(page_address(page), |
e2769dbd | 1028 | PAGE_SIZE << order); |
4db7548c | 1029 | } |
e2769dbd MG |
1030 | arch_free_page(page, order); |
1031 | kernel_poison_pages(page, 1 << order, 0); | |
1032 | kernel_map_pages(page, 1 << order, 0); | |
29b52de1 | 1033 | kasan_free_pages(page, order); |
4db7548c | 1034 | |
4db7548c MG |
1035 | return true; |
1036 | } | |
1037 | ||
e2769dbd MG |
1038 | #ifdef CONFIG_DEBUG_VM |
1039 | static inline bool free_pcp_prepare(struct page *page) | |
1040 | { | |
1041 | return free_pages_prepare(page, 0, true); | |
1042 | } | |
1043 | ||
1044 | static inline bool bulkfree_pcp_prepare(struct page *page) | |
1045 | { | |
1046 | return false; | |
1047 | } | |
1048 | #else | |
1049 | static bool free_pcp_prepare(struct page *page) | |
1050 | { | |
1051 | return free_pages_prepare(page, 0, false); | |
1052 | } | |
1053 | ||
4db7548c MG |
1054 | static bool bulkfree_pcp_prepare(struct page *page) |
1055 | { | |
1056 | return free_pages_check(page); | |
1057 | } | |
1058 | #endif /* CONFIG_DEBUG_VM */ | |
1059 | ||
1da177e4 | 1060 | /* |
5f8dcc21 | 1061 | * Frees a number of pages from the PCP lists |
1da177e4 | 1062 | * Assumes all pages on list are in same zone, and of same order. |
207f36ee | 1063 | * count is the number of pages to free. |
1da177e4 LT |
1064 | * |
1065 | * If the zone was previously in an "all pages pinned" state then look to | |
1066 | * see if this freeing clears that state. | |
1067 | * | |
1068 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
1069 | * pinned" detection logic. | |
1070 | */ | |
5f8dcc21 MG |
1071 | static void free_pcppages_bulk(struct zone *zone, int count, |
1072 | struct per_cpu_pages *pcp) | |
1da177e4 | 1073 | { |
5f8dcc21 | 1074 | int migratetype = 0; |
a6f9edd6 | 1075 | int batch_free = 0; |
0d5d823a | 1076 | unsigned long nr_scanned; |
3777999d | 1077 | bool isolated_pageblocks; |
5f8dcc21 | 1078 | |
c54ad30c | 1079 | spin_lock(&zone->lock); |
3777999d | 1080 | isolated_pageblocks = has_isolate_pageblock(zone); |
599d0c95 | 1081 | nr_scanned = node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED); |
0d5d823a | 1082 | if (nr_scanned) |
599d0c95 | 1083 | __mod_node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED, -nr_scanned); |
f2260e6b | 1084 | |
e5b31ac2 | 1085 | while (count) { |
48db57f8 | 1086 | struct page *page; |
5f8dcc21 MG |
1087 | struct list_head *list; |
1088 | ||
1089 | /* | |
a6f9edd6 MG |
1090 | * Remove pages from lists in a round-robin fashion. A |
1091 | * batch_free count is maintained that is incremented when an | |
1092 | * empty list is encountered. This is so more pages are freed | |
1093 | * off fuller lists instead of spinning excessively around empty | |
1094 | * lists | |
5f8dcc21 MG |
1095 | */ |
1096 | do { | |
a6f9edd6 | 1097 | batch_free++; |
5f8dcc21 MG |
1098 | if (++migratetype == MIGRATE_PCPTYPES) |
1099 | migratetype = 0; | |
1100 | list = &pcp->lists[migratetype]; | |
1101 | } while (list_empty(list)); | |
48db57f8 | 1102 | |
1d16871d NK |
1103 | /* This is the only non-empty list. Free them all. */ |
1104 | if (batch_free == MIGRATE_PCPTYPES) | |
e5b31ac2 | 1105 | batch_free = count; |
1d16871d | 1106 | |
a6f9edd6 | 1107 | do { |
770c8aaa BZ |
1108 | int mt; /* migratetype of the to-be-freed page */ |
1109 | ||
a16601c5 | 1110 | page = list_last_entry(list, struct page, lru); |
a6f9edd6 MG |
1111 | /* must delete as __free_one_page list manipulates */ |
1112 | list_del(&page->lru); | |
aa016d14 | 1113 | |
bb14c2c7 | 1114 | mt = get_pcppage_migratetype(page); |
aa016d14 VB |
1115 | /* MIGRATE_ISOLATE page should not go to pcplists */ |
1116 | VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); | |
1117 | /* Pageblock could have been isolated meanwhile */ | |
3777999d | 1118 | if (unlikely(isolated_pageblocks)) |
51bb1a40 | 1119 | mt = get_pageblock_migratetype(page); |
51bb1a40 | 1120 | |
4db7548c MG |
1121 | if (bulkfree_pcp_prepare(page)) |
1122 | continue; | |
1123 | ||
dc4b0caf | 1124 | __free_one_page(page, page_to_pfn(page), zone, 0, mt); |
770c8aaa | 1125 | trace_mm_page_pcpu_drain(page, 0, mt); |
e5b31ac2 | 1126 | } while (--count && --batch_free && !list_empty(list)); |
1da177e4 | 1127 | } |
c54ad30c | 1128 | spin_unlock(&zone->lock); |
1da177e4 LT |
1129 | } |
1130 | ||
dc4b0caf MG |
1131 | static void free_one_page(struct zone *zone, |
1132 | struct page *page, unsigned long pfn, | |
7aeb09f9 | 1133 | unsigned int order, |
ed0ae21d | 1134 | int migratetype) |
1da177e4 | 1135 | { |
0d5d823a | 1136 | unsigned long nr_scanned; |
006d22d9 | 1137 | spin_lock(&zone->lock); |
599d0c95 | 1138 | nr_scanned = node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED); |
0d5d823a | 1139 | if (nr_scanned) |
599d0c95 | 1140 | __mod_node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED, -nr_scanned); |
f2260e6b | 1141 | |
ad53f92e JK |
1142 | if (unlikely(has_isolate_pageblock(zone) || |
1143 | is_migrate_isolate(migratetype))) { | |
1144 | migratetype = get_pfnblock_migratetype(page, pfn); | |
ad53f92e | 1145 | } |
dc4b0caf | 1146 | __free_one_page(page, pfn, zone, order, migratetype); |
006d22d9 | 1147 | spin_unlock(&zone->lock); |
48db57f8 NP |
1148 | } |
1149 | ||
1e8ce83c RH |
1150 | static void __meminit __init_single_page(struct page *page, unsigned long pfn, |
1151 | unsigned long zone, int nid) | |
1152 | { | |
1e8ce83c | 1153 | set_page_links(page, zone, nid, pfn); |
1e8ce83c RH |
1154 | init_page_count(page); |
1155 | page_mapcount_reset(page); | |
1156 | page_cpupid_reset_last(page); | |
1e8ce83c | 1157 | |
1e8ce83c RH |
1158 | INIT_LIST_HEAD(&page->lru); |
1159 | #ifdef WANT_PAGE_VIRTUAL | |
1160 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
1161 | if (!is_highmem_idx(zone)) | |
1162 | set_page_address(page, __va(pfn << PAGE_SHIFT)); | |
1163 | #endif | |
1164 | } | |
1165 | ||
1166 | static void __meminit __init_single_pfn(unsigned long pfn, unsigned long zone, | |
1167 | int nid) | |
1168 | { | |
1169 | return __init_single_page(pfn_to_page(pfn), pfn, zone, nid); | |
1170 | } | |
1171 | ||
7e18adb4 MG |
1172 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
1173 | static void init_reserved_page(unsigned long pfn) | |
1174 | { | |
1175 | pg_data_t *pgdat; | |
1176 | int nid, zid; | |
1177 | ||
1178 | if (!early_page_uninitialised(pfn)) | |
1179 | return; | |
1180 | ||
1181 | nid = early_pfn_to_nid(pfn); | |
1182 | pgdat = NODE_DATA(nid); | |
1183 | ||
1184 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1185 | struct zone *zone = &pgdat->node_zones[zid]; | |
1186 | ||
1187 | if (pfn >= zone->zone_start_pfn && pfn < zone_end_pfn(zone)) | |
1188 | break; | |
1189 | } | |
1190 | __init_single_pfn(pfn, zid, nid); | |
1191 | } | |
1192 | #else | |
1193 | static inline void init_reserved_page(unsigned long pfn) | |
1194 | { | |
1195 | } | |
1196 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
1197 | ||
92923ca3 NZ |
1198 | /* |
1199 | * Initialised pages do not have PageReserved set. This function is | |
1200 | * called for each range allocated by the bootmem allocator and | |
1201 | * marks the pages PageReserved. The remaining valid pages are later | |
1202 | * sent to the buddy page allocator. | |
1203 | */ | |
4b50bcc7 | 1204 | void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end) |
92923ca3 NZ |
1205 | { |
1206 | unsigned long start_pfn = PFN_DOWN(start); | |
1207 | unsigned long end_pfn = PFN_UP(end); | |
1208 | ||
7e18adb4 MG |
1209 | for (; start_pfn < end_pfn; start_pfn++) { |
1210 | if (pfn_valid(start_pfn)) { | |
1211 | struct page *page = pfn_to_page(start_pfn); | |
1212 | ||
1213 | init_reserved_page(start_pfn); | |
1d798ca3 KS |
1214 | |
1215 | /* Avoid false-positive PageTail() */ | |
1216 | INIT_LIST_HEAD(&page->lru); | |
1217 | ||
7e18adb4 MG |
1218 | SetPageReserved(page); |
1219 | } | |
1220 | } | |
92923ca3 NZ |
1221 | } |
1222 | ||
ec95f53a KM |
1223 | static void __free_pages_ok(struct page *page, unsigned int order) |
1224 | { | |
1225 | unsigned long flags; | |
95e34412 | 1226 | int migratetype; |
dc4b0caf | 1227 | unsigned long pfn = page_to_pfn(page); |
ec95f53a | 1228 | |
e2769dbd | 1229 | if (!free_pages_prepare(page, order, true)) |
ec95f53a KM |
1230 | return; |
1231 | ||
cfc47a28 | 1232 | migratetype = get_pfnblock_migratetype(page, pfn); |
c54ad30c | 1233 | local_irq_save(flags); |
f8891e5e | 1234 | __count_vm_events(PGFREE, 1 << order); |
dc4b0caf | 1235 | free_one_page(page_zone(page), page, pfn, order, migratetype); |
c54ad30c | 1236 | local_irq_restore(flags); |
1da177e4 LT |
1237 | } |
1238 | ||
949698a3 | 1239 | static void __init __free_pages_boot_core(struct page *page, unsigned int order) |
a226f6c8 | 1240 | { |
c3993076 | 1241 | unsigned int nr_pages = 1 << order; |
e2d0bd2b | 1242 | struct page *p = page; |
c3993076 | 1243 | unsigned int loop; |
a226f6c8 | 1244 | |
e2d0bd2b YL |
1245 | prefetchw(p); |
1246 | for (loop = 0; loop < (nr_pages - 1); loop++, p++) { | |
1247 | prefetchw(p + 1); | |
c3993076 JW |
1248 | __ClearPageReserved(p); |
1249 | set_page_count(p, 0); | |
a226f6c8 | 1250 | } |
e2d0bd2b YL |
1251 | __ClearPageReserved(p); |
1252 | set_page_count(p, 0); | |
c3993076 | 1253 | |
e2d0bd2b | 1254 | page_zone(page)->managed_pages += nr_pages; |
c3993076 JW |
1255 | set_page_refcounted(page); |
1256 | __free_pages(page, order); | |
a226f6c8 DH |
1257 | } |
1258 | ||
75a592a4 MG |
1259 | #if defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) || \ |
1260 | defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) | |
7ace9917 | 1261 | |
75a592a4 MG |
1262 | static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata; |
1263 | ||
1264 | int __meminit early_pfn_to_nid(unsigned long pfn) | |
1265 | { | |
7ace9917 | 1266 | static DEFINE_SPINLOCK(early_pfn_lock); |
75a592a4 MG |
1267 | int nid; |
1268 | ||
7ace9917 | 1269 | spin_lock(&early_pfn_lock); |
75a592a4 | 1270 | nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache); |
7ace9917 | 1271 | if (nid < 0) |
e4568d38 | 1272 | nid = first_online_node; |
7ace9917 MG |
1273 | spin_unlock(&early_pfn_lock); |
1274 | ||
1275 | return nid; | |
75a592a4 MG |
1276 | } |
1277 | #endif | |
1278 | ||
1279 | #ifdef CONFIG_NODES_SPAN_OTHER_NODES | |
1280 | static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node, | |
1281 | struct mminit_pfnnid_cache *state) | |
1282 | { | |
1283 | int nid; | |
1284 | ||
1285 | nid = __early_pfn_to_nid(pfn, state); | |
1286 | if (nid >= 0 && nid != node) | |
1287 | return false; | |
1288 | return true; | |
1289 | } | |
1290 | ||
1291 | /* Only safe to use early in boot when initialisation is single-threaded */ | |
1292 | static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) | |
1293 | { | |
1294 | return meminit_pfn_in_nid(pfn, node, &early_pfnnid_cache); | |
1295 | } | |
1296 | ||
1297 | #else | |
1298 | ||
1299 | static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) | |
1300 | { | |
1301 | return true; | |
1302 | } | |
1303 | static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node, | |
1304 | struct mminit_pfnnid_cache *state) | |
1305 | { | |
1306 | return true; | |
1307 | } | |
1308 | #endif | |
1309 | ||
1310 | ||
0e1cc95b | 1311 | void __init __free_pages_bootmem(struct page *page, unsigned long pfn, |
3a80a7fa MG |
1312 | unsigned int order) |
1313 | { | |
1314 | if (early_page_uninitialised(pfn)) | |
1315 | return; | |
949698a3 | 1316 | return __free_pages_boot_core(page, order); |
3a80a7fa MG |
1317 | } |
1318 | ||
7cf91a98 JK |
1319 | /* |
1320 | * Check that the whole (or subset of) a pageblock given by the interval of | |
1321 | * [start_pfn, end_pfn) is valid and within the same zone, before scanning it | |
1322 | * with the migration of free compaction scanner. The scanners then need to | |
1323 | * use only pfn_valid_within() check for arches that allow holes within | |
1324 | * pageblocks. | |
1325 | * | |
1326 | * Return struct page pointer of start_pfn, or NULL if checks were not passed. | |
1327 | * | |
1328 | * It's possible on some configurations to have a setup like node0 node1 node0 | |
1329 | * i.e. it's possible that all pages within a zones range of pages do not | |
1330 | * belong to a single zone. We assume that a border between node0 and node1 | |
1331 | * can occur within a single pageblock, but not a node0 node1 node0 | |
1332 | * interleaving within a single pageblock. It is therefore sufficient to check | |
1333 | * the first and last page of a pageblock and avoid checking each individual | |
1334 | * page in a pageblock. | |
1335 | */ | |
1336 | struct page *__pageblock_pfn_to_page(unsigned long start_pfn, | |
1337 | unsigned long end_pfn, struct zone *zone) | |
1338 | { | |
1339 | struct page *start_page; | |
1340 | struct page *end_page; | |
1341 | ||
1342 | /* end_pfn is one past the range we are checking */ | |
1343 | end_pfn--; | |
1344 | ||
1345 | if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn)) | |
1346 | return NULL; | |
1347 | ||
1348 | start_page = pfn_to_page(start_pfn); | |
1349 | ||
1350 | if (page_zone(start_page) != zone) | |
1351 | return NULL; | |
1352 | ||
1353 | end_page = pfn_to_page(end_pfn); | |
1354 | ||
1355 | /* This gives a shorter code than deriving page_zone(end_page) */ | |
1356 | if (page_zone_id(start_page) != page_zone_id(end_page)) | |
1357 | return NULL; | |
1358 | ||
1359 | return start_page; | |
1360 | } | |
1361 | ||
1362 | void set_zone_contiguous(struct zone *zone) | |
1363 | { | |
1364 | unsigned long block_start_pfn = zone->zone_start_pfn; | |
1365 | unsigned long block_end_pfn; | |
1366 | ||
1367 | block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages); | |
1368 | for (; block_start_pfn < zone_end_pfn(zone); | |
1369 | block_start_pfn = block_end_pfn, | |
1370 | block_end_pfn += pageblock_nr_pages) { | |
1371 | ||
1372 | block_end_pfn = min(block_end_pfn, zone_end_pfn(zone)); | |
1373 | ||
1374 | if (!__pageblock_pfn_to_page(block_start_pfn, | |
1375 | block_end_pfn, zone)) | |
1376 | return; | |
1377 | } | |
1378 | ||
1379 | /* We confirm that there is no hole */ | |
1380 | zone->contiguous = true; | |
1381 | } | |
1382 | ||
1383 | void clear_zone_contiguous(struct zone *zone) | |
1384 | { | |
1385 | zone->contiguous = false; | |
1386 | } | |
1387 | ||
7e18adb4 | 1388 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
0e1cc95b | 1389 | static void __init deferred_free_range(struct page *page, |
a4de83dd MG |
1390 | unsigned long pfn, int nr_pages) |
1391 | { | |
1392 | int i; | |
1393 | ||
1394 | if (!page) | |
1395 | return; | |
1396 | ||
1397 | /* Free a large naturally-aligned chunk if possible */ | |
1398 | if (nr_pages == MAX_ORDER_NR_PAGES && | |
1399 | (pfn & (MAX_ORDER_NR_PAGES-1)) == 0) { | |
ac5d2539 | 1400 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
949698a3 | 1401 | __free_pages_boot_core(page, MAX_ORDER-1); |
a4de83dd MG |
1402 | return; |
1403 | } | |
1404 | ||
949698a3 LZ |
1405 | for (i = 0; i < nr_pages; i++, page++) |
1406 | __free_pages_boot_core(page, 0); | |
a4de83dd MG |
1407 | } |
1408 | ||
d3cd131d NS |
1409 | /* Completion tracking for deferred_init_memmap() threads */ |
1410 | static atomic_t pgdat_init_n_undone __initdata; | |
1411 | static __initdata DECLARE_COMPLETION(pgdat_init_all_done_comp); | |
1412 | ||
1413 | static inline void __init pgdat_init_report_one_done(void) | |
1414 | { | |
1415 | if (atomic_dec_and_test(&pgdat_init_n_undone)) | |
1416 | complete(&pgdat_init_all_done_comp); | |
1417 | } | |
0e1cc95b | 1418 | |
7e18adb4 | 1419 | /* Initialise remaining memory on a node */ |
0e1cc95b | 1420 | static int __init deferred_init_memmap(void *data) |
7e18adb4 | 1421 | { |
0e1cc95b MG |
1422 | pg_data_t *pgdat = data; |
1423 | int nid = pgdat->node_id; | |
7e18adb4 MG |
1424 | struct mminit_pfnnid_cache nid_init_state = { }; |
1425 | unsigned long start = jiffies; | |
1426 | unsigned long nr_pages = 0; | |
1427 | unsigned long walk_start, walk_end; | |
1428 | int i, zid; | |
1429 | struct zone *zone; | |
7e18adb4 | 1430 | unsigned long first_init_pfn = pgdat->first_deferred_pfn; |
0e1cc95b | 1431 | const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); |
7e18adb4 | 1432 | |
0e1cc95b | 1433 | if (first_init_pfn == ULONG_MAX) { |
d3cd131d | 1434 | pgdat_init_report_one_done(); |
0e1cc95b MG |
1435 | return 0; |
1436 | } | |
1437 | ||
1438 | /* Bind memory initialisation thread to a local node if possible */ | |
1439 | if (!cpumask_empty(cpumask)) | |
1440 | set_cpus_allowed_ptr(current, cpumask); | |
7e18adb4 MG |
1441 | |
1442 | /* Sanity check boundaries */ | |
1443 | BUG_ON(pgdat->first_deferred_pfn < pgdat->node_start_pfn); | |
1444 | BUG_ON(pgdat->first_deferred_pfn > pgdat_end_pfn(pgdat)); | |
1445 | pgdat->first_deferred_pfn = ULONG_MAX; | |
1446 | ||
1447 | /* Only the highest zone is deferred so find it */ | |
1448 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1449 | zone = pgdat->node_zones + zid; | |
1450 | if (first_init_pfn < zone_end_pfn(zone)) | |
1451 | break; | |
1452 | } | |
1453 | ||
1454 | for_each_mem_pfn_range(i, nid, &walk_start, &walk_end, NULL) { | |
1455 | unsigned long pfn, end_pfn; | |
54608c3f | 1456 | struct page *page = NULL; |
a4de83dd MG |
1457 | struct page *free_base_page = NULL; |
1458 | unsigned long free_base_pfn = 0; | |
1459 | int nr_to_free = 0; | |
7e18adb4 MG |
1460 | |
1461 | end_pfn = min(walk_end, zone_end_pfn(zone)); | |
1462 | pfn = first_init_pfn; | |
1463 | if (pfn < walk_start) | |
1464 | pfn = walk_start; | |
1465 | if (pfn < zone->zone_start_pfn) | |
1466 | pfn = zone->zone_start_pfn; | |
1467 | ||
1468 | for (; pfn < end_pfn; pfn++) { | |
54608c3f | 1469 | if (!pfn_valid_within(pfn)) |
a4de83dd | 1470 | goto free_range; |
7e18adb4 | 1471 | |
54608c3f MG |
1472 | /* |
1473 | * Ensure pfn_valid is checked every | |
1474 | * MAX_ORDER_NR_PAGES for memory holes | |
1475 | */ | |
1476 | if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) { | |
1477 | if (!pfn_valid(pfn)) { | |
1478 | page = NULL; | |
a4de83dd | 1479 | goto free_range; |
54608c3f MG |
1480 | } |
1481 | } | |
1482 | ||
1483 | if (!meminit_pfn_in_nid(pfn, nid, &nid_init_state)) { | |
1484 | page = NULL; | |
a4de83dd | 1485 | goto free_range; |
54608c3f MG |
1486 | } |
1487 | ||
1488 | /* Minimise pfn page lookups and scheduler checks */ | |
1489 | if (page && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) { | |
1490 | page++; | |
1491 | } else { | |
a4de83dd MG |
1492 | nr_pages += nr_to_free; |
1493 | deferred_free_range(free_base_page, | |
1494 | free_base_pfn, nr_to_free); | |
1495 | free_base_page = NULL; | |
1496 | free_base_pfn = nr_to_free = 0; | |
1497 | ||
54608c3f MG |
1498 | page = pfn_to_page(pfn); |
1499 | cond_resched(); | |
1500 | } | |
7e18adb4 MG |
1501 | |
1502 | if (page->flags) { | |
1503 | VM_BUG_ON(page_zone(page) != zone); | |
a4de83dd | 1504 | goto free_range; |
7e18adb4 MG |
1505 | } |
1506 | ||
1507 | __init_single_page(page, pfn, zid, nid); | |
a4de83dd MG |
1508 | if (!free_base_page) { |
1509 | free_base_page = page; | |
1510 | free_base_pfn = pfn; | |
1511 | nr_to_free = 0; | |
1512 | } | |
1513 | nr_to_free++; | |
1514 | ||
1515 | /* Where possible, batch up pages for a single free */ | |
1516 | continue; | |
1517 | free_range: | |
1518 | /* Free the current block of pages to allocator */ | |
1519 | nr_pages += nr_to_free; | |
1520 | deferred_free_range(free_base_page, free_base_pfn, | |
1521 | nr_to_free); | |
1522 | free_base_page = NULL; | |
1523 | free_base_pfn = nr_to_free = 0; | |
7e18adb4 | 1524 | } |
a4de83dd | 1525 | |
7e18adb4 MG |
1526 | first_init_pfn = max(end_pfn, first_init_pfn); |
1527 | } | |
1528 | ||
1529 | /* Sanity check that the next zone really is unpopulated */ | |
1530 | WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); | |
1531 | ||
0e1cc95b | 1532 | pr_info("node %d initialised, %lu pages in %ums\n", nid, nr_pages, |
7e18adb4 | 1533 | jiffies_to_msecs(jiffies - start)); |
d3cd131d NS |
1534 | |
1535 | pgdat_init_report_one_done(); | |
0e1cc95b MG |
1536 | return 0; |
1537 | } | |
7cf91a98 | 1538 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ |
0e1cc95b MG |
1539 | |
1540 | void __init page_alloc_init_late(void) | |
1541 | { | |
7cf91a98 JK |
1542 | struct zone *zone; |
1543 | ||
1544 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
0e1cc95b MG |
1545 | int nid; |
1546 | ||
d3cd131d NS |
1547 | /* There will be num_node_state(N_MEMORY) threads */ |
1548 | atomic_set(&pgdat_init_n_undone, num_node_state(N_MEMORY)); | |
0e1cc95b | 1549 | for_each_node_state(nid, N_MEMORY) { |
0e1cc95b MG |
1550 | kthread_run(deferred_init_memmap, NODE_DATA(nid), "pgdatinit%d", nid); |
1551 | } | |
1552 | ||
1553 | /* Block until all are initialised */ | |
d3cd131d | 1554 | wait_for_completion(&pgdat_init_all_done_comp); |
4248b0da MG |
1555 | |
1556 | /* Reinit limits that are based on free pages after the kernel is up */ | |
1557 | files_maxfiles_init(); | |
7cf91a98 JK |
1558 | #endif |
1559 | ||
1560 | for_each_populated_zone(zone) | |
1561 | set_zone_contiguous(zone); | |
7e18adb4 | 1562 | } |
7e18adb4 | 1563 | |
47118af0 | 1564 | #ifdef CONFIG_CMA |
9cf510a5 | 1565 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ |
47118af0 MN |
1566 | void __init init_cma_reserved_pageblock(struct page *page) |
1567 | { | |
1568 | unsigned i = pageblock_nr_pages; | |
1569 | struct page *p = page; | |
1570 | ||
1571 | do { | |
1572 | __ClearPageReserved(p); | |
1573 | set_page_count(p, 0); | |
1574 | } while (++p, --i); | |
1575 | ||
47118af0 | 1576 | set_pageblock_migratetype(page, MIGRATE_CMA); |
dc78327c MN |
1577 | |
1578 | if (pageblock_order >= MAX_ORDER) { | |
1579 | i = pageblock_nr_pages; | |
1580 | p = page; | |
1581 | do { | |
1582 | set_page_refcounted(p); | |
1583 | __free_pages(p, MAX_ORDER - 1); | |
1584 | p += MAX_ORDER_NR_PAGES; | |
1585 | } while (i -= MAX_ORDER_NR_PAGES); | |
1586 | } else { | |
1587 | set_page_refcounted(page); | |
1588 | __free_pages(page, pageblock_order); | |
1589 | } | |
1590 | ||
3dcc0571 | 1591 | adjust_managed_page_count(page, pageblock_nr_pages); |
47118af0 MN |
1592 | } |
1593 | #endif | |
1da177e4 LT |
1594 | |
1595 | /* | |
1596 | * The order of subdivision here is critical for the IO subsystem. | |
1597 | * Please do not alter this order without good reasons and regression | |
1598 | * testing. Specifically, as large blocks of memory are subdivided, | |
1599 | * the order in which smaller blocks are delivered depends on the order | |
1600 | * they're subdivided in this function. This is the primary factor | |
1601 | * influencing the order in which pages are delivered to the IO | |
1602 | * subsystem according to empirical testing, and this is also justified | |
1603 | * by considering the behavior of a buddy system containing a single | |
1604 | * large block of memory acted on by a series of small allocations. | |
1605 | * This behavior is a critical factor in sglist merging's success. | |
1606 | * | |
6d49e352 | 1607 | * -- nyc |
1da177e4 | 1608 | */ |
085cc7d5 | 1609 | static inline void expand(struct zone *zone, struct page *page, |
b2a0ac88 MG |
1610 | int low, int high, struct free_area *area, |
1611 | int migratetype) | |
1da177e4 LT |
1612 | { |
1613 | unsigned long size = 1 << high; | |
1614 | ||
1615 | while (high > low) { | |
1616 | area--; | |
1617 | high--; | |
1618 | size >>= 1; | |
309381fe | 1619 | VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); |
c0a32fc5 | 1620 | |
2847cf95 | 1621 | if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && |
e30825f1 | 1622 | debug_guardpage_enabled() && |
2847cf95 | 1623 | high < debug_guardpage_minorder()) { |
c0a32fc5 SG |
1624 | /* |
1625 | * Mark as guard pages (or page), that will allow to | |
1626 | * merge back to allocator when buddy will be freed. | |
1627 | * Corresponding page table entries will not be touched, | |
1628 | * pages will stay not present in virtual address space | |
1629 | */ | |
2847cf95 | 1630 | set_page_guard(zone, &page[size], high, migratetype); |
c0a32fc5 SG |
1631 | continue; |
1632 | } | |
b2a0ac88 | 1633 | list_add(&page[size].lru, &area->free_list[migratetype]); |
1da177e4 LT |
1634 | area->nr_free++; |
1635 | set_page_order(&page[size], high); | |
1636 | } | |
1da177e4 LT |
1637 | } |
1638 | ||
4e611801 | 1639 | static void check_new_page_bad(struct page *page) |
1da177e4 | 1640 | { |
4e611801 VB |
1641 | const char *bad_reason = NULL; |
1642 | unsigned long bad_flags = 0; | |
7bfec6f4 | 1643 | |
53f9263b | 1644 | if (unlikely(atomic_read(&page->_mapcount) != -1)) |
f0b791a3 DH |
1645 | bad_reason = "nonzero mapcount"; |
1646 | if (unlikely(page->mapping != NULL)) | |
1647 | bad_reason = "non-NULL mapping"; | |
fe896d18 | 1648 | if (unlikely(page_ref_count(page) != 0)) |
f0b791a3 | 1649 | bad_reason = "nonzero _count"; |
f4c18e6f NH |
1650 | if (unlikely(page->flags & __PG_HWPOISON)) { |
1651 | bad_reason = "HWPoisoned (hardware-corrupted)"; | |
1652 | bad_flags = __PG_HWPOISON; | |
e570f56c NH |
1653 | /* Don't complain about hwpoisoned pages */ |
1654 | page_mapcount_reset(page); /* remove PageBuddy */ | |
1655 | return; | |
f4c18e6f | 1656 | } |
f0b791a3 DH |
1657 | if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP)) { |
1658 | bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set"; | |
1659 | bad_flags = PAGE_FLAGS_CHECK_AT_PREP; | |
1660 | } | |
9edad6ea JW |
1661 | #ifdef CONFIG_MEMCG |
1662 | if (unlikely(page->mem_cgroup)) | |
1663 | bad_reason = "page still charged to cgroup"; | |
1664 | #endif | |
4e611801 VB |
1665 | bad_page(page, bad_reason, bad_flags); |
1666 | } | |
1667 | ||
1668 | /* | |
1669 | * This page is about to be returned from the page allocator | |
1670 | */ | |
1671 | static inline int check_new_page(struct page *page) | |
1672 | { | |
1673 | if (likely(page_expected_state(page, | |
1674 | PAGE_FLAGS_CHECK_AT_PREP|__PG_HWPOISON))) | |
1675 | return 0; | |
1676 | ||
1677 | check_new_page_bad(page); | |
1678 | return 1; | |
2a7684a2 WF |
1679 | } |
1680 | ||
1414c7f4 LA |
1681 | static inline bool free_pages_prezeroed(bool poisoned) |
1682 | { | |
1683 | return IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) && | |
1684 | page_poisoning_enabled() && poisoned; | |
1685 | } | |
1686 | ||
479f854a MG |
1687 | #ifdef CONFIG_DEBUG_VM |
1688 | static bool check_pcp_refill(struct page *page) | |
1689 | { | |
1690 | return false; | |
1691 | } | |
1692 | ||
1693 | static bool check_new_pcp(struct page *page) | |
1694 | { | |
1695 | return check_new_page(page); | |
1696 | } | |
1697 | #else | |
1698 | static bool check_pcp_refill(struct page *page) | |
1699 | { | |
1700 | return check_new_page(page); | |
1701 | } | |
1702 | static bool check_new_pcp(struct page *page) | |
1703 | { | |
1704 | return false; | |
1705 | } | |
1706 | #endif /* CONFIG_DEBUG_VM */ | |
1707 | ||
1708 | static bool check_new_pages(struct page *page, unsigned int order) | |
1709 | { | |
1710 | int i; | |
1711 | for (i = 0; i < (1 << order); i++) { | |
1712 | struct page *p = page + i; | |
1713 | ||
1714 | if (unlikely(check_new_page(p))) | |
1715 | return true; | |
1716 | } | |
1717 | ||
1718 | return false; | |
1719 | } | |
1720 | ||
46f24fd8 JK |
1721 | inline void post_alloc_hook(struct page *page, unsigned int order, |
1722 | gfp_t gfp_flags) | |
1723 | { | |
1724 | set_page_private(page, 0); | |
1725 | set_page_refcounted(page); | |
1726 | ||
1727 | arch_alloc_page(page, order); | |
1728 | kernel_map_pages(page, 1 << order, 1); | |
1729 | kernel_poison_pages(page, 1 << order, 1); | |
1730 | kasan_alloc_pages(page, order); | |
1731 | set_page_owner(page, order, gfp_flags); | |
1732 | } | |
1733 | ||
479f854a | 1734 | static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, |
c603844b | 1735 | unsigned int alloc_flags) |
2a7684a2 WF |
1736 | { |
1737 | int i; | |
1414c7f4 | 1738 | bool poisoned = true; |
2a7684a2 WF |
1739 | |
1740 | for (i = 0; i < (1 << order); i++) { | |
1741 | struct page *p = page + i; | |
1414c7f4 LA |
1742 | if (poisoned) |
1743 | poisoned &= page_is_poisoned(p); | |
2a7684a2 | 1744 | } |
689bcebf | 1745 | |
46f24fd8 | 1746 | post_alloc_hook(page, order, gfp_flags); |
17cf4406 | 1747 | |
1414c7f4 | 1748 | if (!free_pages_prezeroed(poisoned) && (gfp_flags & __GFP_ZERO)) |
f4d2897b AA |
1749 | for (i = 0; i < (1 << order); i++) |
1750 | clear_highpage(page + i); | |
17cf4406 NP |
1751 | |
1752 | if (order && (gfp_flags & __GFP_COMP)) | |
1753 | prep_compound_page(page, order); | |
1754 | ||
75379191 | 1755 | /* |
2f064f34 | 1756 | * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to |
75379191 VB |
1757 | * allocate the page. The expectation is that the caller is taking |
1758 | * steps that will free more memory. The caller should avoid the page | |
1759 | * being used for !PFMEMALLOC purposes. | |
1760 | */ | |
2f064f34 MH |
1761 | if (alloc_flags & ALLOC_NO_WATERMARKS) |
1762 | set_page_pfmemalloc(page); | |
1763 | else | |
1764 | clear_page_pfmemalloc(page); | |
1da177e4 LT |
1765 | } |
1766 | ||
56fd56b8 MG |
1767 | /* |
1768 | * Go through the free lists for the given migratetype and remove | |
1769 | * the smallest available page from the freelists | |
1770 | */ | |
728ec980 MG |
1771 | static inline |
1772 | struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, | |
56fd56b8 MG |
1773 | int migratetype) |
1774 | { | |
1775 | unsigned int current_order; | |
b8af2941 | 1776 | struct free_area *area; |
56fd56b8 MG |
1777 | struct page *page; |
1778 | ||
1779 | /* Find a page of the appropriate size in the preferred list */ | |
1780 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
1781 | area = &(zone->free_area[current_order]); | |
a16601c5 | 1782 | page = list_first_entry_or_null(&area->free_list[migratetype], |
56fd56b8 | 1783 | struct page, lru); |
a16601c5 GT |
1784 | if (!page) |
1785 | continue; | |
56fd56b8 MG |
1786 | list_del(&page->lru); |
1787 | rmv_page_order(page); | |
1788 | area->nr_free--; | |
56fd56b8 | 1789 | expand(zone, page, order, current_order, area, migratetype); |
bb14c2c7 | 1790 | set_pcppage_migratetype(page, migratetype); |
56fd56b8 MG |
1791 | return page; |
1792 | } | |
1793 | ||
1794 | return NULL; | |
1795 | } | |
1796 | ||
1797 | ||
b2a0ac88 MG |
1798 | /* |
1799 | * This array describes the order lists are fallen back to when | |
1800 | * the free lists for the desirable migrate type are depleted | |
1801 | */ | |
47118af0 | 1802 | static int fallbacks[MIGRATE_TYPES][4] = { |
974a786e MG |
1803 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, |
1804 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, | |
1805 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_TYPES }, | |
47118af0 | 1806 | #ifdef CONFIG_CMA |
974a786e | 1807 | [MIGRATE_CMA] = { MIGRATE_TYPES }, /* Never used */ |
47118af0 | 1808 | #endif |
194159fb | 1809 | #ifdef CONFIG_MEMORY_ISOLATION |
974a786e | 1810 | [MIGRATE_ISOLATE] = { MIGRATE_TYPES }, /* Never used */ |
194159fb | 1811 | #endif |
b2a0ac88 MG |
1812 | }; |
1813 | ||
dc67647b JK |
1814 | #ifdef CONFIG_CMA |
1815 | static struct page *__rmqueue_cma_fallback(struct zone *zone, | |
1816 | unsigned int order) | |
1817 | { | |
1818 | return __rmqueue_smallest(zone, order, MIGRATE_CMA); | |
1819 | } | |
1820 | #else | |
1821 | static inline struct page *__rmqueue_cma_fallback(struct zone *zone, | |
1822 | unsigned int order) { return NULL; } | |
1823 | #endif | |
1824 | ||
c361be55 MG |
1825 | /* |
1826 | * Move the free pages in a range to the free lists of the requested type. | |
d9c23400 | 1827 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
1828 | * boundary. If alignment is required, use move_freepages_block() |
1829 | */ | |
435b405c | 1830 | int move_freepages(struct zone *zone, |
b69a7288 AB |
1831 | struct page *start_page, struct page *end_page, |
1832 | int migratetype) | |
c361be55 MG |
1833 | { |
1834 | struct page *page; | |
d00181b9 | 1835 | unsigned int order; |
d100313f | 1836 | int pages_moved = 0; |
c361be55 MG |
1837 | |
1838 | #ifndef CONFIG_HOLES_IN_ZONE | |
1839 | /* | |
1840 | * page_zone is not safe to call in this context when | |
1841 | * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant | |
1842 | * anyway as we check zone boundaries in move_freepages_block(). | |
1843 | * Remove at a later date when no bug reports exist related to | |
ac0e5b7a | 1844 | * grouping pages by mobility |
c361be55 | 1845 | */ |
97ee4ba7 | 1846 | VM_BUG_ON(page_zone(start_page) != page_zone(end_page)); |
c361be55 MG |
1847 | #endif |
1848 | ||
1849 | for (page = start_page; page <= end_page;) { | |
344c790e | 1850 | /* Make sure we are not inadvertently changing nodes */ |
309381fe | 1851 | VM_BUG_ON_PAGE(page_to_nid(page) != zone_to_nid(zone), page); |
344c790e | 1852 | |
c361be55 MG |
1853 | if (!pfn_valid_within(page_to_pfn(page))) { |
1854 | page++; | |
1855 | continue; | |
1856 | } | |
1857 | ||
1858 | if (!PageBuddy(page)) { | |
1859 | page++; | |
1860 | continue; | |
1861 | } | |
1862 | ||
1863 | order = page_order(page); | |
84be48d8 KS |
1864 | list_move(&page->lru, |
1865 | &zone->free_area[order].free_list[migratetype]); | |
c361be55 | 1866 | page += 1 << order; |
d100313f | 1867 | pages_moved += 1 << order; |
c361be55 MG |
1868 | } |
1869 | ||
d100313f | 1870 | return pages_moved; |
c361be55 MG |
1871 | } |
1872 | ||
ee6f509c | 1873 | int move_freepages_block(struct zone *zone, struct page *page, |
68e3e926 | 1874 | int migratetype) |
c361be55 MG |
1875 | { |
1876 | unsigned long start_pfn, end_pfn; | |
1877 | struct page *start_page, *end_page; | |
1878 | ||
1879 | start_pfn = page_to_pfn(page); | |
d9c23400 | 1880 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 1881 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
1882 | end_page = start_page + pageblock_nr_pages - 1; |
1883 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
1884 | |
1885 | /* Do not cross zone boundaries */ | |
108bcc96 | 1886 | if (!zone_spans_pfn(zone, start_pfn)) |
c361be55 | 1887 | start_page = page; |
108bcc96 | 1888 | if (!zone_spans_pfn(zone, end_pfn)) |
c361be55 MG |
1889 | return 0; |
1890 | ||
1891 | return move_freepages(zone, start_page, end_page, migratetype); | |
1892 | } | |
1893 | ||
2f66a68f MG |
1894 | static void change_pageblock_range(struct page *pageblock_page, |
1895 | int start_order, int migratetype) | |
1896 | { | |
1897 | int nr_pageblocks = 1 << (start_order - pageblock_order); | |
1898 | ||
1899 | while (nr_pageblocks--) { | |
1900 | set_pageblock_migratetype(pageblock_page, migratetype); | |
1901 | pageblock_page += pageblock_nr_pages; | |
1902 | } | |
1903 | } | |
1904 | ||
fef903ef | 1905 | /* |
9c0415eb VB |
1906 | * When we are falling back to another migratetype during allocation, try to |
1907 | * steal extra free pages from the same pageblocks to satisfy further | |
1908 | * allocations, instead of polluting multiple pageblocks. | |
1909 | * | |
1910 | * If we are stealing a relatively large buddy page, it is likely there will | |
1911 | * be more free pages in the pageblock, so try to steal them all. For | |
1912 | * reclaimable and unmovable allocations, we steal regardless of page size, | |
1913 | * as fragmentation caused by those allocations polluting movable pageblocks | |
1914 | * is worse than movable allocations stealing from unmovable and reclaimable | |
1915 | * pageblocks. | |
fef903ef | 1916 | */ |
4eb7dce6 JK |
1917 | static bool can_steal_fallback(unsigned int order, int start_mt) |
1918 | { | |
1919 | /* | |
1920 | * Leaving this order check is intended, although there is | |
1921 | * relaxed order check in next check. The reason is that | |
1922 | * we can actually steal whole pageblock if this condition met, | |
1923 | * but, below check doesn't guarantee it and that is just heuristic | |
1924 | * so could be changed anytime. | |
1925 | */ | |
1926 | if (order >= pageblock_order) | |
1927 | return true; | |
1928 | ||
1929 | if (order >= pageblock_order / 2 || | |
1930 | start_mt == MIGRATE_RECLAIMABLE || | |
1931 | start_mt == MIGRATE_UNMOVABLE || | |
1932 | page_group_by_mobility_disabled) | |
1933 | return true; | |
1934 | ||
1935 | return false; | |
1936 | } | |
1937 | ||
1938 | /* | |
1939 | * This function implements actual steal behaviour. If order is large enough, | |
1940 | * we can steal whole pageblock. If not, we first move freepages in this | |
1941 | * pageblock and check whether half of pages are moved or not. If half of | |
1942 | * pages are moved, we can change migratetype of pageblock and permanently | |
1943 | * use it's pages as requested migratetype in the future. | |
1944 | */ | |
1945 | static void steal_suitable_fallback(struct zone *zone, struct page *page, | |
1946 | int start_type) | |
fef903ef | 1947 | { |
d00181b9 | 1948 | unsigned int current_order = page_order(page); |
4eb7dce6 | 1949 | int pages; |
fef903ef | 1950 | |
fef903ef SB |
1951 | /* Take ownership for orders >= pageblock_order */ |
1952 | if (current_order >= pageblock_order) { | |
1953 | change_pageblock_range(page, current_order, start_type); | |
3a1086fb | 1954 | return; |
fef903ef SB |
1955 | } |
1956 | ||
4eb7dce6 | 1957 | pages = move_freepages_block(zone, page, start_type); |
fef903ef | 1958 | |
4eb7dce6 JK |
1959 | /* Claim the whole block if over half of it is free */ |
1960 | if (pages >= (1 << (pageblock_order-1)) || | |
1961 | page_group_by_mobility_disabled) | |
1962 | set_pageblock_migratetype(page, start_type); | |
1963 | } | |
1964 | ||
2149cdae JK |
1965 | /* |
1966 | * Check whether there is a suitable fallback freepage with requested order. | |
1967 | * If only_stealable is true, this function returns fallback_mt only if | |
1968 | * we can steal other freepages all together. This would help to reduce | |
1969 | * fragmentation due to mixed migratetype pages in one pageblock. | |
1970 | */ | |
1971 | int find_suitable_fallback(struct free_area *area, unsigned int order, | |
1972 | int migratetype, bool only_stealable, bool *can_steal) | |
4eb7dce6 JK |
1973 | { |
1974 | int i; | |
1975 | int fallback_mt; | |
1976 | ||
1977 | if (area->nr_free == 0) | |
1978 | return -1; | |
1979 | ||
1980 | *can_steal = false; | |
1981 | for (i = 0;; i++) { | |
1982 | fallback_mt = fallbacks[migratetype][i]; | |
974a786e | 1983 | if (fallback_mt == MIGRATE_TYPES) |
4eb7dce6 JK |
1984 | break; |
1985 | ||
1986 | if (list_empty(&area->free_list[fallback_mt])) | |
1987 | continue; | |
fef903ef | 1988 | |
4eb7dce6 JK |
1989 | if (can_steal_fallback(order, migratetype)) |
1990 | *can_steal = true; | |
1991 | ||
2149cdae JK |
1992 | if (!only_stealable) |
1993 | return fallback_mt; | |
1994 | ||
1995 | if (*can_steal) | |
1996 | return fallback_mt; | |
fef903ef | 1997 | } |
4eb7dce6 JK |
1998 | |
1999 | return -1; | |
fef903ef SB |
2000 | } |
2001 | ||
0aaa29a5 MG |
2002 | /* |
2003 | * Reserve a pageblock for exclusive use of high-order atomic allocations if | |
2004 | * there are no empty page blocks that contain a page with a suitable order | |
2005 | */ | |
2006 | static void reserve_highatomic_pageblock(struct page *page, struct zone *zone, | |
2007 | unsigned int alloc_order) | |
2008 | { | |
2009 | int mt; | |
2010 | unsigned long max_managed, flags; | |
2011 | ||
2012 | /* | |
2013 | * Limit the number reserved to 1 pageblock or roughly 1% of a zone. | |
2014 | * Check is race-prone but harmless. | |
2015 | */ | |
2016 | max_managed = (zone->managed_pages / 100) + pageblock_nr_pages; | |
2017 | if (zone->nr_reserved_highatomic >= max_managed) | |
2018 | return; | |
2019 | ||
2020 | spin_lock_irqsave(&zone->lock, flags); | |
2021 | ||
2022 | /* Recheck the nr_reserved_highatomic limit under the lock */ | |
2023 | if (zone->nr_reserved_highatomic >= max_managed) | |
2024 | goto out_unlock; | |
2025 | ||
2026 | /* Yoink! */ | |
2027 | mt = get_pageblock_migratetype(page); | |
2028 | if (mt != MIGRATE_HIGHATOMIC && | |
2029 | !is_migrate_isolate(mt) && !is_migrate_cma(mt)) { | |
2030 | zone->nr_reserved_highatomic += pageblock_nr_pages; | |
2031 | set_pageblock_migratetype(page, MIGRATE_HIGHATOMIC); | |
2032 | move_freepages_block(zone, page, MIGRATE_HIGHATOMIC); | |
2033 | } | |
2034 | ||
2035 | out_unlock: | |
2036 | spin_unlock_irqrestore(&zone->lock, flags); | |
2037 | } | |
2038 | ||
2039 | /* | |
2040 | * Used when an allocation is about to fail under memory pressure. This | |
2041 | * potentially hurts the reliability of high-order allocations when under | |
2042 | * intense memory pressure but failed atomic allocations should be easier | |
2043 | * to recover from than an OOM. | |
2044 | */ | |
2045 | static void unreserve_highatomic_pageblock(const struct alloc_context *ac) | |
2046 | { | |
2047 | struct zonelist *zonelist = ac->zonelist; | |
2048 | unsigned long flags; | |
2049 | struct zoneref *z; | |
2050 | struct zone *zone; | |
2051 | struct page *page; | |
2052 | int order; | |
2053 | ||
2054 | for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->high_zoneidx, | |
2055 | ac->nodemask) { | |
2056 | /* Preserve at least one pageblock */ | |
2057 | if (zone->nr_reserved_highatomic <= pageblock_nr_pages) | |
2058 | continue; | |
2059 | ||
2060 | spin_lock_irqsave(&zone->lock, flags); | |
2061 | for (order = 0; order < MAX_ORDER; order++) { | |
2062 | struct free_area *area = &(zone->free_area[order]); | |
2063 | ||
a16601c5 GT |
2064 | page = list_first_entry_or_null( |
2065 | &area->free_list[MIGRATE_HIGHATOMIC], | |
2066 | struct page, lru); | |
2067 | if (!page) | |
0aaa29a5 MG |
2068 | continue; |
2069 | ||
0aaa29a5 MG |
2070 | /* |
2071 | * It should never happen but changes to locking could | |
2072 | * inadvertently allow a per-cpu drain to add pages | |
2073 | * to MIGRATE_HIGHATOMIC while unreserving so be safe | |
2074 | * and watch for underflows. | |
2075 | */ | |
2076 | zone->nr_reserved_highatomic -= min(pageblock_nr_pages, | |
2077 | zone->nr_reserved_highatomic); | |
2078 | ||
2079 | /* | |
2080 | * Convert to ac->migratetype and avoid the normal | |
2081 | * pageblock stealing heuristics. Minimally, the caller | |
2082 | * is doing the work and needs the pages. More | |
2083 | * importantly, if the block was always converted to | |
2084 | * MIGRATE_UNMOVABLE or another type then the number | |
2085 | * of pageblocks that cannot be completely freed | |
2086 | * may increase. | |
2087 | */ | |
2088 | set_pageblock_migratetype(page, ac->migratetype); | |
2089 | move_freepages_block(zone, page, ac->migratetype); | |
2090 | spin_unlock_irqrestore(&zone->lock, flags); | |
2091 | return; | |
2092 | } | |
2093 | spin_unlock_irqrestore(&zone->lock, flags); | |
2094 | } | |
2095 | } | |
2096 | ||
b2a0ac88 | 2097 | /* Remove an element from the buddy allocator from the fallback list */ |
0ac3a409 | 2098 | static inline struct page * |
7aeb09f9 | 2099 | __rmqueue_fallback(struct zone *zone, unsigned int order, int start_migratetype) |
b2a0ac88 | 2100 | { |
b8af2941 | 2101 | struct free_area *area; |
7aeb09f9 | 2102 | unsigned int current_order; |
b2a0ac88 | 2103 | struct page *page; |
4eb7dce6 JK |
2104 | int fallback_mt; |
2105 | bool can_steal; | |
b2a0ac88 MG |
2106 | |
2107 | /* Find the largest possible block of pages in the other list */ | |
7aeb09f9 MG |
2108 | for (current_order = MAX_ORDER-1; |
2109 | current_order >= order && current_order <= MAX_ORDER-1; | |
2110 | --current_order) { | |
4eb7dce6 JK |
2111 | area = &(zone->free_area[current_order]); |
2112 | fallback_mt = find_suitable_fallback(area, current_order, | |
2149cdae | 2113 | start_migratetype, false, &can_steal); |
4eb7dce6 JK |
2114 | if (fallback_mt == -1) |
2115 | continue; | |
b2a0ac88 | 2116 | |
a16601c5 | 2117 | page = list_first_entry(&area->free_list[fallback_mt], |
4eb7dce6 JK |
2118 | struct page, lru); |
2119 | if (can_steal) | |
2120 | steal_suitable_fallback(zone, page, start_migratetype); | |
b2a0ac88 | 2121 | |
4eb7dce6 JK |
2122 | /* Remove the page from the freelists */ |
2123 | area->nr_free--; | |
2124 | list_del(&page->lru); | |
2125 | rmv_page_order(page); | |
3a1086fb | 2126 | |
4eb7dce6 JK |
2127 | expand(zone, page, order, current_order, area, |
2128 | start_migratetype); | |
2129 | /* | |
bb14c2c7 | 2130 | * The pcppage_migratetype may differ from pageblock's |
4eb7dce6 | 2131 | * migratetype depending on the decisions in |
bb14c2c7 VB |
2132 | * find_suitable_fallback(). This is OK as long as it does not |
2133 | * differ for MIGRATE_CMA pageblocks. Those can be used as | |
2134 | * fallback only via special __rmqueue_cma_fallback() function | |
4eb7dce6 | 2135 | */ |
bb14c2c7 | 2136 | set_pcppage_migratetype(page, start_migratetype); |
e0fff1bd | 2137 | |
4eb7dce6 JK |
2138 | trace_mm_page_alloc_extfrag(page, order, current_order, |
2139 | start_migratetype, fallback_mt); | |
e0fff1bd | 2140 | |
4eb7dce6 | 2141 | return page; |
b2a0ac88 MG |
2142 | } |
2143 | ||
728ec980 | 2144 | return NULL; |
b2a0ac88 MG |
2145 | } |
2146 | ||
56fd56b8 | 2147 | /* |
1da177e4 LT |
2148 | * Do the hard work of removing an element from the buddy allocator. |
2149 | * Call me with the zone->lock already held. | |
2150 | */ | |
b2a0ac88 | 2151 | static struct page *__rmqueue(struct zone *zone, unsigned int order, |
6ac0206b | 2152 | int migratetype) |
1da177e4 | 2153 | { |
1da177e4 LT |
2154 | struct page *page; |
2155 | ||
56fd56b8 | 2156 | page = __rmqueue_smallest(zone, order, migratetype); |
974a786e | 2157 | if (unlikely(!page)) { |
dc67647b JK |
2158 | if (migratetype == MIGRATE_MOVABLE) |
2159 | page = __rmqueue_cma_fallback(zone, order); | |
2160 | ||
2161 | if (!page) | |
2162 | page = __rmqueue_fallback(zone, order, migratetype); | |
728ec980 MG |
2163 | } |
2164 | ||
0d3d062a | 2165 | trace_mm_page_alloc_zone_locked(page, order, migratetype); |
b2a0ac88 | 2166 | return page; |
1da177e4 LT |
2167 | } |
2168 | ||
5f63b720 | 2169 | /* |
1da177e4 LT |
2170 | * Obtain a specified number of elements from the buddy allocator, all under |
2171 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
2172 | * Returns the number of new pages which were placed at *list. | |
2173 | */ | |
5f63b720 | 2174 | static int rmqueue_bulk(struct zone *zone, unsigned int order, |
b2a0ac88 | 2175 | unsigned long count, struct list_head *list, |
b745bc85 | 2176 | int migratetype, bool cold) |
1da177e4 | 2177 | { |
5bcc9f86 | 2178 | int i; |
5f63b720 | 2179 | |
c54ad30c | 2180 | spin_lock(&zone->lock); |
1da177e4 | 2181 | for (i = 0; i < count; ++i) { |
6ac0206b | 2182 | struct page *page = __rmqueue(zone, order, migratetype); |
085cc7d5 | 2183 | if (unlikely(page == NULL)) |
1da177e4 | 2184 | break; |
81eabcbe | 2185 | |
479f854a MG |
2186 | if (unlikely(check_pcp_refill(page))) |
2187 | continue; | |
2188 | ||
81eabcbe MG |
2189 | /* |
2190 | * Split buddy pages returned by expand() are received here | |
2191 | * in physical page order. The page is added to the callers and | |
2192 | * list and the list head then moves forward. From the callers | |
2193 | * perspective, the linked list is ordered by page number in | |
2194 | * some conditions. This is useful for IO devices that can | |
2195 | * merge IO requests if the physical pages are ordered | |
2196 | * properly. | |
2197 | */ | |
b745bc85 | 2198 | if (likely(!cold)) |
e084b2d9 MG |
2199 | list_add(&page->lru, list); |
2200 | else | |
2201 | list_add_tail(&page->lru, list); | |
81eabcbe | 2202 | list = &page->lru; |
bb14c2c7 | 2203 | if (is_migrate_cma(get_pcppage_migratetype(page))) |
d1ce749a BZ |
2204 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, |
2205 | -(1 << order)); | |
1da177e4 | 2206 | } |
f2260e6b | 2207 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); |
c54ad30c | 2208 | spin_unlock(&zone->lock); |
085cc7d5 | 2209 | return i; |
1da177e4 LT |
2210 | } |
2211 | ||
4ae7c039 | 2212 | #ifdef CONFIG_NUMA |
8fce4d8e | 2213 | /* |
4037d452 CL |
2214 | * Called from the vmstat counter updater to drain pagesets of this |
2215 | * currently executing processor on remote nodes after they have | |
2216 | * expired. | |
2217 | * | |
879336c3 CL |
2218 | * Note that this function must be called with the thread pinned to |
2219 | * a single processor. | |
8fce4d8e | 2220 | */ |
4037d452 | 2221 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 2222 | { |
4ae7c039 | 2223 | unsigned long flags; |
7be12fc9 | 2224 | int to_drain, batch; |
4ae7c039 | 2225 | |
4037d452 | 2226 | local_irq_save(flags); |
4db0c3c2 | 2227 | batch = READ_ONCE(pcp->batch); |
7be12fc9 | 2228 | to_drain = min(pcp->count, batch); |
2a13515c KM |
2229 | if (to_drain > 0) { |
2230 | free_pcppages_bulk(zone, to_drain, pcp); | |
2231 | pcp->count -= to_drain; | |
2232 | } | |
4037d452 | 2233 | local_irq_restore(flags); |
4ae7c039 CL |
2234 | } |
2235 | #endif | |
2236 | ||
9f8f2172 | 2237 | /* |
93481ff0 | 2238 | * Drain pcplists of the indicated processor and zone. |
9f8f2172 CL |
2239 | * |
2240 | * The processor must either be the current processor and the | |
2241 | * thread pinned to the current processor or a processor that | |
2242 | * is not online. | |
2243 | */ | |
93481ff0 | 2244 | static void drain_pages_zone(unsigned int cpu, struct zone *zone) |
1da177e4 | 2245 | { |
c54ad30c | 2246 | unsigned long flags; |
93481ff0 VB |
2247 | struct per_cpu_pageset *pset; |
2248 | struct per_cpu_pages *pcp; | |
1da177e4 | 2249 | |
93481ff0 VB |
2250 | local_irq_save(flags); |
2251 | pset = per_cpu_ptr(zone->pageset, cpu); | |
1da177e4 | 2252 | |
93481ff0 VB |
2253 | pcp = &pset->pcp; |
2254 | if (pcp->count) { | |
2255 | free_pcppages_bulk(zone, pcp->count, pcp); | |
2256 | pcp->count = 0; | |
2257 | } | |
2258 | local_irq_restore(flags); | |
2259 | } | |
3dfa5721 | 2260 | |
93481ff0 VB |
2261 | /* |
2262 | * Drain pcplists of all zones on the indicated processor. | |
2263 | * | |
2264 | * The processor must either be the current processor and the | |
2265 | * thread pinned to the current processor or a processor that | |
2266 | * is not online. | |
2267 | */ | |
2268 | static void drain_pages(unsigned int cpu) | |
2269 | { | |
2270 | struct zone *zone; | |
2271 | ||
2272 | for_each_populated_zone(zone) { | |
2273 | drain_pages_zone(cpu, zone); | |
1da177e4 LT |
2274 | } |
2275 | } | |
1da177e4 | 2276 | |
9f8f2172 CL |
2277 | /* |
2278 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
93481ff0 VB |
2279 | * |
2280 | * The CPU has to be pinned. When zone parameter is non-NULL, spill just | |
2281 | * the single zone's pages. | |
9f8f2172 | 2282 | */ |
93481ff0 | 2283 | void drain_local_pages(struct zone *zone) |
9f8f2172 | 2284 | { |
93481ff0 VB |
2285 | int cpu = smp_processor_id(); |
2286 | ||
2287 | if (zone) | |
2288 | drain_pages_zone(cpu, zone); | |
2289 | else | |
2290 | drain_pages(cpu); | |
9f8f2172 CL |
2291 | } |
2292 | ||
2293 | /* | |
74046494 GBY |
2294 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator. |
2295 | * | |
93481ff0 VB |
2296 | * When zone parameter is non-NULL, spill just the single zone's pages. |
2297 | * | |
74046494 GBY |
2298 | * Note that this code is protected against sending an IPI to an offline |
2299 | * CPU but does not guarantee sending an IPI to newly hotplugged CPUs: | |
2300 | * on_each_cpu_mask() blocks hotplug and won't talk to offlined CPUs but | |
2301 | * nothing keeps CPUs from showing up after we populated the cpumask and | |
2302 | * before the call to on_each_cpu_mask(). | |
9f8f2172 | 2303 | */ |
93481ff0 | 2304 | void drain_all_pages(struct zone *zone) |
9f8f2172 | 2305 | { |
74046494 | 2306 | int cpu; |
74046494 GBY |
2307 | |
2308 | /* | |
2309 | * Allocate in the BSS so we wont require allocation in | |
2310 | * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y | |
2311 | */ | |
2312 | static cpumask_t cpus_with_pcps; | |
2313 | ||
2314 | /* | |
2315 | * We don't care about racing with CPU hotplug event | |
2316 | * as offline notification will cause the notified | |
2317 | * cpu to drain that CPU pcps and on_each_cpu_mask | |
2318 | * disables preemption as part of its processing | |
2319 | */ | |
2320 | for_each_online_cpu(cpu) { | |
93481ff0 VB |
2321 | struct per_cpu_pageset *pcp; |
2322 | struct zone *z; | |
74046494 | 2323 | bool has_pcps = false; |
93481ff0 VB |
2324 | |
2325 | if (zone) { | |
74046494 | 2326 | pcp = per_cpu_ptr(zone->pageset, cpu); |
93481ff0 | 2327 | if (pcp->pcp.count) |
74046494 | 2328 | has_pcps = true; |
93481ff0 VB |
2329 | } else { |
2330 | for_each_populated_zone(z) { | |
2331 | pcp = per_cpu_ptr(z->pageset, cpu); | |
2332 | if (pcp->pcp.count) { | |
2333 | has_pcps = true; | |
2334 | break; | |
2335 | } | |
74046494 GBY |
2336 | } |
2337 | } | |
93481ff0 | 2338 | |
74046494 GBY |
2339 | if (has_pcps) |
2340 | cpumask_set_cpu(cpu, &cpus_with_pcps); | |
2341 | else | |
2342 | cpumask_clear_cpu(cpu, &cpus_with_pcps); | |
2343 | } | |
93481ff0 VB |
2344 | on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages, |
2345 | zone, 1); | |
9f8f2172 CL |
2346 | } |
2347 | ||
296699de | 2348 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
2349 | |
2350 | void mark_free_pages(struct zone *zone) | |
2351 | { | |
f623f0db RW |
2352 | unsigned long pfn, max_zone_pfn; |
2353 | unsigned long flags; | |
7aeb09f9 | 2354 | unsigned int order, t; |
86760a2c | 2355 | struct page *page; |
1da177e4 | 2356 | |
8080fc03 | 2357 | if (zone_is_empty(zone)) |
1da177e4 LT |
2358 | return; |
2359 | ||
2360 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db | 2361 | |
108bcc96 | 2362 | max_zone_pfn = zone_end_pfn(zone); |
f623f0db RW |
2363 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
2364 | if (pfn_valid(pfn)) { | |
86760a2c | 2365 | page = pfn_to_page(pfn); |
ba6b0979 JK |
2366 | |
2367 | if (page_zone(page) != zone) | |
2368 | continue; | |
2369 | ||
7be98234 RW |
2370 | if (!swsusp_page_is_forbidden(page)) |
2371 | swsusp_unset_page_free(page); | |
f623f0db | 2372 | } |
1da177e4 | 2373 | |
b2a0ac88 | 2374 | for_each_migratetype_order(order, t) { |
86760a2c GT |
2375 | list_for_each_entry(page, |
2376 | &zone->free_area[order].free_list[t], lru) { | |
f623f0db | 2377 | unsigned long i; |
1da177e4 | 2378 | |
86760a2c | 2379 | pfn = page_to_pfn(page); |
f623f0db | 2380 | for (i = 0; i < (1UL << order); i++) |
7be98234 | 2381 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
f623f0db | 2382 | } |
b2a0ac88 | 2383 | } |
1da177e4 LT |
2384 | spin_unlock_irqrestore(&zone->lock, flags); |
2385 | } | |
e2c55dc8 | 2386 | #endif /* CONFIG_PM */ |
1da177e4 | 2387 | |
1da177e4 LT |
2388 | /* |
2389 | * Free a 0-order page | |
b745bc85 | 2390 | * cold == true ? free a cold page : free a hot page |
1da177e4 | 2391 | */ |
b745bc85 | 2392 | void free_hot_cold_page(struct page *page, bool cold) |
1da177e4 LT |
2393 | { |
2394 | struct zone *zone = page_zone(page); | |
2395 | struct per_cpu_pages *pcp; | |
2396 | unsigned long flags; | |
dc4b0caf | 2397 | unsigned long pfn = page_to_pfn(page); |
5f8dcc21 | 2398 | int migratetype; |
1da177e4 | 2399 | |
4db7548c | 2400 | if (!free_pcp_prepare(page)) |
689bcebf HD |
2401 | return; |
2402 | ||
dc4b0caf | 2403 | migratetype = get_pfnblock_migratetype(page, pfn); |
bb14c2c7 | 2404 | set_pcppage_migratetype(page, migratetype); |
1da177e4 | 2405 | local_irq_save(flags); |
f8891e5e | 2406 | __count_vm_event(PGFREE); |
da456f14 | 2407 | |
5f8dcc21 MG |
2408 | /* |
2409 | * We only track unmovable, reclaimable and movable on pcp lists. | |
2410 | * Free ISOLATE pages back to the allocator because they are being | |
2411 | * offlined but treat RESERVE as movable pages so we can get those | |
2412 | * areas back if necessary. Otherwise, we may have to free | |
2413 | * excessively into the page allocator | |
2414 | */ | |
2415 | if (migratetype >= MIGRATE_PCPTYPES) { | |
194159fb | 2416 | if (unlikely(is_migrate_isolate(migratetype))) { |
dc4b0caf | 2417 | free_one_page(zone, page, pfn, 0, migratetype); |
5f8dcc21 MG |
2418 | goto out; |
2419 | } | |
2420 | migratetype = MIGRATE_MOVABLE; | |
2421 | } | |
2422 | ||
99dcc3e5 | 2423 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
b745bc85 | 2424 | if (!cold) |
5f8dcc21 | 2425 | list_add(&page->lru, &pcp->lists[migratetype]); |
b745bc85 MG |
2426 | else |
2427 | list_add_tail(&page->lru, &pcp->lists[migratetype]); | |
1da177e4 | 2428 | pcp->count++; |
48db57f8 | 2429 | if (pcp->count >= pcp->high) { |
4db0c3c2 | 2430 | unsigned long batch = READ_ONCE(pcp->batch); |
998d39cb CS |
2431 | free_pcppages_bulk(zone, batch, pcp); |
2432 | pcp->count -= batch; | |
48db57f8 | 2433 | } |
5f8dcc21 MG |
2434 | |
2435 | out: | |
1da177e4 | 2436 | local_irq_restore(flags); |
1da177e4 LT |
2437 | } |
2438 | ||
cc59850e KK |
2439 | /* |
2440 | * Free a list of 0-order pages | |
2441 | */ | |
b745bc85 | 2442 | void free_hot_cold_page_list(struct list_head *list, bool cold) |
cc59850e KK |
2443 | { |
2444 | struct page *page, *next; | |
2445 | ||
2446 | list_for_each_entry_safe(page, next, list, lru) { | |
b413d48a | 2447 | trace_mm_page_free_batched(page, cold); |
cc59850e KK |
2448 | free_hot_cold_page(page, cold); |
2449 | } | |
2450 | } | |
2451 | ||
8dfcc9ba NP |
2452 | /* |
2453 | * split_page takes a non-compound higher-order page, and splits it into | |
2454 | * n (1<<order) sub-pages: page[0..n] | |
2455 | * Each sub-page must be freed individually. | |
2456 | * | |
2457 | * Note: this is probably too low level an operation for use in drivers. | |
2458 | * Please consult with lkml before using this in your driver. | |
2459 | */ | |
2460 | void split_page(struct page *page, unsigned int order) | |
2461 | { | |
2462 | int i; | |
2463 | ||
309381fe SL |
2464 | VM_BUG_ON_PAGE(PageCompound(page), page); |
2465 | VM_BUG_ON_PAGE(!page_count(page), page); | |
b1eeab67 VN |
2466 | |
2467 | #ifdef CONFIG_KMEMCHECK | |
2468 | /* | |
2469 | * Split shadow pages too, because free(page[0]) would | |
2470 | * otherwise free the whole shadow. | |
2471 | */ | |
2472 | if (kmemcheck_page_is_tracked(page)) | |
2473 | split_page(virt_to_page(page[0].shadow), order); | |
2474 | #endif | |
2475 | ||
a9627bc5 | 2476 | for (i = 1; i < (1 << order); i++) |
7835e98b | 2477 | set_page_refcounted(page + i); |
a9627bc5 | 2478 | split_page_owner(page, order); |
8dfcc9ba | 2479 | } |
5853ff23 | 2480 | EXPORT_SYMBOL_GPL(split_page); |
8dfcc9ba | 2481 | |
3c605096 | 2482 | int __isolate_free_page(struct page *page, unsigned int order) |
748446bb | 2483 | { |
748446bb MG |
2484 | unsigned long watermark; |
2485 | struct zone *zone; | |
2139cbe6 | 2486 | int mt; |
748446bb MG |
2487 | |
2488 | BUG_ON(!PageBuddy(page)); | |
2489 | ||
2490 | zone = page_zone(page); | |
2e30abd1 | 2491 | mt = get_pageblock_migratetype(page); |
748446bb | 2492 | |
194159fb | 2493 | if (!is_migrate_isolate(mt)) { |
2e30abd1 MS |
2494 | /* Obey watermarks as if the page was being allocated */ |
2495 | watermark = low_wmark_pages(zone) + (1 << order); | |
2496 | if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) | |
2497 | return 0; | |
2498 | ||
8fb74b9f | 2499 | __mod_zone_freepage_state(zone, -(1UL << order), mt); |
2e30abd1 | 2500 | } |
748446bb MG |
2501 | |
2502 | /* Remove page from free list */ | |
2503 | list_del(&page->lru); | |
2504 | zone->free_area[order].nr_free--; | |
2505 | rmv_page_order(page); | |
2139cbe6 | 2506 | |
400bc7fd | 2507 | /* |
2508 | * Set the pageblock if the isolated page is at least half of a | |
2509 | * pageblock | |
2510 | */ | |
748446bb MG |
2511 | if (order >= pageblock_order - 1) { |
2512 | struct page *endpage = page + (1 << order) - 1; | |
47118af0 MN |
2513 | for (; page < endpage; page += pageblock_nr_pages) { |
2514 | int mt = get_pageblock_migratetype(page); | |
194159fb | 2515 | if (!is_migrate_isolate(mt) && !is_migrate_cma(mt)) |
47118af0 MN |
2516 | set_pageblock_migratetype(page, |
2517 | MIGRATE_MOVABLE); | |
2518 | } | |
748446bb MG |
2519 | } |
2520 | ||
f3a14ced | 2521 | |
8fb74b9f | 2522 | return 1UL << order; |
1fb3f8ca MG |
2523 | } |
2524 | ||
060e7417 MG |
2525 | /* |
2526 | * Update NUMA hit/miss statistics | |
2527 | * | |
2528 | * Must be called with interrupts disabled. | |
2529 | * | |
2530 | * When __GFP_OTHER_NODE is set assume the node of the preferred | |
2531 | * zone is the local node. This is useful for daemons who allocate | |
2532 | * memory on behalf of other processes. | |
2533 | */ | |
2534 | static inline void zone_statistics(struct zone *preferred_zone, struct zone *z, | |
2535 | gfp_t flags) | |
2536 | { | |
2537 | #ifdef CONFIG_NUMA | |
2538 | int local_nid = numa_node_id(); | |
2539 | enum zone_stat_item local_stat = NUMA_LOCAL; | |
2540 | ||
2541 | if (unlikely(flags & __GFP_OTHER_NODE)) { | |
2542 | local_stat = NUMA_OTHER; | |
2543 | local_nid = preferred_zone->node; | |
2544 | } | |
2545 | ||
2546 | if (z->node == local_nid) { | |
2547 | __inc_zone_state(z, NUMA_HIT); | |
2548 | __inc_zone_state(z, local_stat); | |
2549 | } else { | |
2550 | __inc_zone_state(z, NUMA_MISS); | |
2551 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); | |
2552 | } | |
2553 | #endif | |
2554 | } | |
2555 | ||
1da177e4 | 2556 | /* |
75379191 | 2557 | * Allocate a page from the given zone. Use pcplists for order-0 allocations. |
1da177e4 | 2558 | */ |
0a15c3e9 MG |
2559 | static inline |
2560 | struct page *buffered_rmqueue(struct zone *preferred_zone, | |
7aeb09f9 | 2561 | struct zone *zone, unsigned int order, |
c603844b MG |
2562 | gfp_t gfp_flags, unsigned int alloc_flags, |
2563 | int migratetype) | |
1da177e4 LT |
2564 | { |
2565 | unsigned long flags; | |
689bcebf | 2566 | struct page *page; |
b745bc85 | 2567 | bool cold = ((gfp_flags & __GFP_COLD) != 0); |
1da177e4 | 2568 | |
48db57f8 | 2569 | if (likely(order == 0)) { |
1da177e4 | 2570 | struct per_cpu_pages *pcp; |
5f8dcc21 | 2571 | struct list_head *list; |
1da177e4 | 2572 | |
1da177e4 | 2573 | local_irq_save(flags); |
479f854a MG |
2574 | do { |
2575 | pcp = &this_cpu_ptr(zone->pageset)->pcp; | |
2576 | list = &pcp->lists[migratetype]; | |
2577 | if (list_empty(list)) { | |
2578 | pcp->count += rmqueue_bulk(zone, 0, | |
2579 | pcp->batch, list, | |
2580 | migratetype, cold); | |
2581 | if (unlikely(list_empty(list))) | |
2582 | goto failed; | |
2583 | } | |
b92a6edd | 2584 | |
479f854a MG |
2585 | if (cold) |
2586 | page = list_last_entry(list, struct page, lru); | |
2587 | else | |
2588 | page = list_first_entry(list, struct page, lru); | |
5f8dcc21 | 2589 | |
83b9355b VB |
2590 | list_del(&page->lru); |
2591 | pcp->count--; | |
2592 | ||
2593 | } while (check_new_pcp(page)); | |
7fb1d9fc | 2594 | } else { |
0f352e53 MH |
2595 | /* |
2596 | * We most definitely don't want callers attempting to | |
2597 | * allocate greater than order-1 page units with __GFP_NOFAIL. | |
2598 | */ | |
2599 | WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); | |
1da177e4 | 2600 | spin_lock_irqsave(&zone->lock, flags); |
0aaa29a5 | 2601 | |
479f854a MG |
2602 | do { |
2603 | page = NULL; | |
2604 | if (alloc_flags & ALLOC_HARDER) { | |
2605 | page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC); | |
2606 | if (page) | |
2607 | trace_mm_page_alloc_zone_locked(page, order, migratetype); | |
2608 | } | |
2609 | if (!page) | |
2610 | page = __rmqueue(zone, order, migratetype); | |
2611 | } while (page && check_new_pages(page, order)); | |
a74609fa NP |
2612 | spin_unlock(&zone->lock); |
2613 | if (!page) | |
2614 | goto failed; | |
d1ce749a | 2615 | __mod_zone_freepage_state(zone, -(1 << order), |
bb14c2c7 | 2616 | get_pcppage_migratetype(page)); |
1da177e4 LT |
2617 | } |
2618 | ||
16709d1d | 2619 | __count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order); |
78afd561 | 2620 | zone_statistics(preferred_zone, zone, gfp_flags); |
a74609fa | 2621 | local_irq_restore(flags); |
1da177e4 | 2622 | |
309381fe | 2623 | VM_BUG_ON_PAGE(bad_range(zone, page), page); |
1da177e4 | 2624 | return page; |
a74609fa NP |
2625 | |
2626 | failed: | |
2627 | local_irq_restore(flags); | |
a74609fa | 2628 | return NULL; |
1da177e4 LT |
2629 | } |
2630 | ||
933e312e AM |
2631 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
2632 | ||
b2588c4b | 2633 | static struct { |
933e312e AM |
2634 | struct fault_attr attr; |
2635 | ||
621a5f7a | 2636 | bool ignore_gfp_highmem; |
71baba4b | 2637 | bool ignore_gfp_reclaim; |
54114994 | 2638 | u32 min_order; |
933e312e AM |
2639 | } fail_page_alloc = { |
2640 | .attr = FAULT_ATTR_INITIALIZER, | |
71baba4b | 2641 | .ignore_gfp_reclaim = true, |
621a5f7a | 2642 | .ignore_gfp_highmem = true, |
54114994 | 2643 | .min_order = 1, |
933e312e AM |
2644 | }; |
2645 | ||
2646 | static int __init setup_fail_page_alloc(char *str) | |
2647 | { | |
2648 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
2649 | } | |
2650 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
2651 | ||
deaf386e | 2652 | static bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 2653 | { |
54114994 | 2654 | if (order < fail_page_alloc.min_order) |
deaf386e | 2655 | return false; |
933e312e | 2656 | if (gfp_mask & __GFP_NOFAIL) |
deaf386e | 2657 | return false; |
933e312e | 2658 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) |
deaf386e | 2659 | return false; |
71baba4b MG |
2660 | if (fail_page_alloc.ignore_gfp_reclaim && |
2661 | (gfp_mask & __GFP_DIRECT_RECLAIM)) | |
deaf386e | 2662 | return false; |
933e312e AM |
2663 | |
2664 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
2665 | } | |
2666 | ||
2667 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
2668 | ||
2669 | static int __init fail_page_alloc_debugfs(void) | |
2670 | { | |
f4ae40a6 | 2671 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
933e312e | 2672 | struct dentry *dir; |
933e312e | 2673 | |
dd48c085 AM |
2674 | dir = fault_create_debugfs_attr("fail_page_alloc", NULL, |
2675 | &fail_page_alloc.attr); | |
2676 | if (IS_ERR(dir)) | |
2677 | return PTR_ERR(dir); | |
933e312e | 2678 | |
b2588c4b | 2679 | if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, |
71baba4b | 2680 | &fail_page_alloc.ignore_gfp_reclaim)) |
b2588c4b AM |
2681 | goto fail; |
2682 | if (!debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
2683 | &fail_page_alloc.ignore_gfp_highmem)) | |
2684 | goto fail; | |
2685 | if (!debugfs_create_u32("min-order", mode, dir, | |
2686 | &fail_page_alloc.min_order)) | |
2687 | goto fail; | |
2688 | ||
2689 | return 0; | |
2690 | fail: | |
dd48c085 | 2691 | debugfs_remove_recursive(dir); |
933e312e | 2692 | |
b2588c4b | 2693 | return -ENOMEM; |
933e312e AM |
2694 | } |
2695 | ||
2696 | late_initcall(fail_page_alloc_debugfs); | |
2697 | ||
2698 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
2699 | ||
2700 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
2701 | ||
deaf386e | 2702 | static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 2703 | { |
deaf386e | 2704 | return false; |
933e312e AM |
2705 | } |
2706 | ||
2707 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
2708 | ||
1da177e4 | 2709 | /* |
97a16fc8 MG |
2710 | * Return true if free base pages are above 'mark'. For high-order checks it |
2711 | * will return true of the order-0 watermark is reached and there is at least | |
2712 | * one free page of a suitable size. Checking now avoids taking the zone lock | |
2713 | * to check in the allocation paths if no pages are free. | |
1da177e4 | 2714 | */ |
86a294a8 MH |
2715 | bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
2716 | int classzone_idx, unsigned int alloc_flags, | |
2717 | long free_pages) | |
1da177e4 | 2718 | { |
d23ad423 | 2719 | long min = mark; |
1da177e4 | 2720 | int o; |
c603844b | 2721 | const bool alloc_harder = (alloc_flags & ALLOC_HARDER); |
1da177e4 | 2722 | |
0aaa29a5 | 2723 | /* free_pages may go negative - that's OK */ |
df0a6daa | 2724 | free_pages -= (1 << order) - 1; |
0aaa29a5 | 2725 | |
7fb1d9fc | 2726 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 2727 | min -= min / 2; |
0aaa29a5 MG |
2728 | |
2729 | /* | |
2730 | * If the caller does not have rights to ALLOC_HARDER then subtract | |
2731 | * the high-atomic reserves. This will over-estimate the size of the | |
2732 | * atomic reserve but it avoids a search. | |
2733 | */ | |
97a16fc8 | 2734 | if (likely(!alloc_harder)) |
0aaa29a5 MG |
2735 | free_pages -= z->nr_reserved_highatomic; |
2736 | else | |
1da177e4 | 2737 | min -= min / 4; |
e2b19197 | 2738 | |
d95ea5d1 BZ |
2739 | #ifdef CONFIG_CMA |
2740 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
2741 | if (!(alloc_flags & ALLOC_CMA)) | |
97a16fc8 | 2742 | free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES); |
d95ea5d1 | 2743 | #endif |
026b0814 | 2744 | |
97a16fc8 MG |
2745 | /* |
2746 | * Check watermarks for an order-0 allocation request. If these | |
2747 | * are not met, then a high-order request also cannot go ahead | |
2748 | * even if a suitable page happened to be free. | |
2749 | */ | |
2750 | if (free_pages <= min + z->lowmem_reserve[classzone_idx]) | |
88f5acf8 | 2751 | return false; |
1da177e4 | 2752 | |
97a16fc8 MG |
2753 | /* If this is an order-0 request then the watermark is fine */ |
2754 | if (!order) | |
2755 | return true; | |
2756 | ||
2757 | /* For a high-order request, check at least one suitable page is free */ | |
2758 | for (o = order; o < MAX_ORDER; o++) { | |
2759 | struct free_area *area = &z->free_area[o]; | |
2760 | int mt; | |
2761 | ||
2762 | if (!area->nr_free) | |
2763 | continue; | |
2764 | ||
2765 | if (alloc_harder) | |
2766 | return true; | |
1da177e4 | 2767 | |
97a16fc8 MG |
2768 | for (mt = 0; mt < MIGRATE_PCPTYPES; mt++) { |
2769 | if (!list_empty(&area->free_list[mt])) | |
2770 | return true; | |
2771 | } | |
2772 | ||
2773 | #ifdef CONFIG_CMA | |
2774 | if ((alloc_flags & ALLOC_CMA) && | |
2775 | !list_empty(&area->free_list[MIGRATE_CMA])) { | |
2776 | return true; | |
2777 | } | |
2778 | #endif | |
1da177e4 | 2779 | } |
97a16fc8 | 2780 | return false; |
88f5acf8 MG |
2781 | } |
2782 | ||
7aeb09f9 | 2783 | bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
c603844b | 2784 | int classzone_idx, unsigned int alloc_flags) |
88f5acf8 MG |
2785 | { |
2786 | return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, | |
2787 | zone_page_state(z, NR_FREE_PAGES)); | |
2788 | } | |
2789 | ||
48ee5f36 MG |
2790 | static inline bool zone_watermark_fast(struct zone *z, unsigned int order, |
2791 | unsigned long mark, int classzone_idx, unsigned int alloc_flags) | |
2792 | { | |
2793 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
2794 | long cma_pages = 0; | |
2795 | ||
2796 | #ifdef CONFIG_CMA | |
2797 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
2798 | if (!(alloc_flags & ALLOC_CMA)) | |
2799 | cma_pages = zone_page_state(z, NR_FREE_CMA_PAGES); | |
2800 | #endif | |
2801 | ||
2802 | /* | |
2803 | * Fast check for order-0 only. If this fails then the reserves | |
2804 | * need to be calculated. There is a corner case where the check | |
2805 | * passes but only the high-order atomic reserve are free. If | |
2806 | * the caller is !atomic then it'll uselessly search the free | |
2807 | * list. That corner case is then slower but it is harmless. | |
2808 | */ | |
2809 | if (!order && (free_pages - cma_pages) > mark + z->lowmem_reserve[classzone_idx]) | |
2810 | return true; | |
2811 | ||
2812 | return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, | |
2813 | free_pages); | |
2814 | } | |
2815 | ||
7aeb09f9 | 2816 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
e2b19197 | 2817 | unsigned long mark, int classzone_idx) |
88f5acf8 MG |
2818 | { |
2819 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
2820 | ||
2821 | if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) | |
2822 | free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); | |
2823 | ||
e2b19197 | 2824 | return __zone_watermark_ok(z, order, mark, classzone_idx, 0, |
88f5acf8 | 2825 | free_pages); |
1da177e4 LT |
2826 | } |
2827 | ||
9276b1bc | 2828 | #ifdef CONFIG_NUMA |
957f822a DR |
2829 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
2830 | { | |
5f7a75ac MG |
2831 | return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) < |
2832 | RECLAIM_DISTANCE; | |
957f822a | 2833 | } |
9276b1bc | 2834 | #else /* CONFIG_NUMA */ |
957f822a DR |
2835 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
2836 | { | |
2837 | return true; | |
2838 | } | |
9276b1bc PJ |
2839 | #endif /* CONFIG_NUMA */ |
2840 | ||
7fb1d9fc | 2841 | /* |
0798e519 | 2842 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
2843 | * a page. |
2844 | */ | |
2845 | static struct page * | |
a9263751 VB |
2846 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, |
2847 | const struct alloc_context *ac) | |
753ee728 | 2848 | { |
c33d6c06 | 2849 | struct zoneref *z = ac->preferred_zoneref; |
5117f45d | 2850 | struct zone *zone; |
3b8c0be4 MG |
2851 | struct pglist_data *last_pgdat_dirty_limit = NULL; |
2852 | ||
7fb1d9fc | 2853 | /* |
9276b1bc | 2854 | * Scan zonelist, looking for a zone with enough free. |
344736f2 | 2855 | * See also __cpuset_node_allowed() comment in kernel/cpuset.c. |
7fb1d9fc | 2856 | */ |
c33d6c06 | 2857 | for_next_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, |
a9263751 | 2858 | ac->nodemask) { |
be06af00 | 2859 | struct page *page; |
e085dbc5 JW |
2860 | unsigned long mark; |
2861 | ||
664eedde MG |
2862 | if (cpusets_enabled() && |
2863 | (alloc_flags & ALLOC_CPUSET) && | |
002f2906 | 2864 | !__cpuset_zone_allowed(zone, gfp_mask)) |
cd38b115 | 2865 | continue; |
a756cf59 JW |
2866 | /* |
2867 | * When allocating a page cache page for writing, we | |
281e3726 MG |
2868 | * want to get it from a node that is within its dirty |
2869 | * limit, such that no single node holds more than its | |
a756cf59 | 2870 | * proportional share of globally allowed dirty pages. |
281e3726 | 2871 | * The dirty limits take into account the node's |
a756cf59 JW |
2872 | * lowmem reserves and high watermark so that kswapd |
2873 | * should be able to balance it without having to | |
2874 | * write pages from its LRU list. | |
2875 | * | |
a756cf59 | 2876 | * XXX: For now, allow allocations to potentially |
281e3726 | 2877 | * exceed the per-node dirty limit in the slowpath |
c9ab0c4f | 2878 | * (spread_dirty_pages unset) before going into reclaim, |
a756cf59 | 2879 | * which is important when on a NUMA setup the allowed |
281e3726 | 2880 | * nodes are together not big enough to reach the |
a756cf59 | 2881 | * global limit. The proper fix for these situations |
281e3726 | 2882 | * will require awareness of nodes in the |
a756cf59 JW |
2883 | * dirty-throttling and the flusher threads. |
2884 | */ | |
3b8c0be4 MG |
2885 | if (ac->spread_dirty_pages) { |
2886 | if (last_pgdat_dirty_limit == zone->zone_pgdat) | |
2887 | continue; | |
2888 | ||
2889 | if (!node_dirty_ok(zone->zone_pgdat)) { | |
2890 | last_pgdat_dirty_limit = zone->zone_pgdat; | |
2891 | continue; | |
2892 | } | |
2893 | } | |
7fb1d9fc | 2894 | |
e085dbc5 | 2895 | mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK]; |
48ee5f36 | 2896 | if (!zone_watermark_fast(zone, order, mark, |
93ea9964 | 2897 | ac_classzone_idx(ac), alloc_flags)) { |
fa5e084e MG |
2898 | int ret; |
2899 | ||
5dab2911 MG |
2900 | /* Checked here to keep the fast path fast */ |
2901 | BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); | |
2902 | if (alloc_flags & ALLOC_NO_WATERMARKS) | |
2903 | goto try_this_zone; | |
2904 | ||
a5f5f91d | 2905 | if (node_reclaim_mode == 0 || |
c33d6c06 | 2906 | !zone_allows_reclaim(ac->preferred_zoneref->zone, zone)) |
cd38b115 MG |
2907 | continue; |
2908 | ||
a5f5f91d | 2909 | ret = node_reclaim(zone->zone_pgdat, gfp_mask, order); |
fa5e084e | 2910 | switch (ret) { |
a5f5f91d | 2911 | case NODE_RECLAIM_NOSCAN: |
fa5e084e | 2912 | /* did not scan */ |
cd38b115 | 2913 | continue; |
a5f5f91d | 2914 | case NODE_RECLAIM_FULL: |
fa5e084e | 2915 | /* scanned but unreclaimable */ |
cd38b115 | 2916 | continue; |
fa5e084e MG |
2917 | default: |
2918 | /* did we reclaim enough */ | |
fed2719e | 2919 | if (zone_watermark_ok(zone, order, mark, |
93ea9964 | 2920 | ac_classzone_idx(ac), alloc_flags)) |
fed2719e MG |
2921 | goto try_this_zone; |
2922 | ||
fed2719e | 2923 | continue; |
0798e519 | 2924 | } |
7fb1d9fc RS |
2925 | } |
2926 | ||
fa5e084e | 2927 | try_this_zone: |
c33d6c06 | 2928 | page = buffered_rmqueue(ac->preferred_zoneref->zone, zone, order, |
0aaa29a5 | 2929 | gfp_mask, alloc_flags, ac->migratetype); |
75379191 | 2930 | if (page) { |
479f854a | 2931 | prep_new_page(page, order, gfp_mask, alloc_flags); |
0aaa29a5 MG |
2932 | |
2933 | /* | |
2934 | * If this is a high-order atomic allocation then check | |
2935 | * if the pageblock should be reserved for the future | |
2936 | */ | |
2937 | if (unlikely(order && (alloc_flags & ALLOC_HARDER))) | |
2938 | reserve_highatomic_pageblock(page, zone, order); | |
2939 | ||
75379191 VB |
2940 | return page; |
2941 | } | |
54a6eb5c | 2942 | } |
9276b1bc | 2943 | |
4ffeaf35 | 2944 | return NULL; |
753ee728 MH |
2945 | } |
2946 | ||
29423e77 DR |
2947 | /* |
2948 | * Large machines with many possible nodes should not always dump per-node | |
2949 | * meminfo in irq context. | |
2950 | */ | |
2951 | static inline bool should_suppress_show_mem(void) | |
2952 | { | |
2953 | bool ret = false; | |
2954 | ||
2955 | #if NODES_SHIFT > 8 | |
2956 | ret = in_interrupt(); | |
2957 | #endif | |
2958 | return ret; | |
2959 | } | |
2960 | ||
a238ab5b DH |
2961 | static DEFINE_RATELIMIT_STATE(nopage_rs, |
2962 | DEFAULT_RATELIMIT_INTERVAL, | |
2963 | DEFAULT_RATELIMIT_BURST); | |
2964 | ||
d00181b9 | 2965 | void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...) |
a238ab5b | 2966 | { |
a238ab5b DH |
2967 | unsigned int filter = SHOW_MEM_FILTER_NODES; |
2968 | ||
c0a32fc5 SG |
2969 | if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) || |
2970 | debug_guardpage_minorder() > 0) | |
a238ab5b DH |
2971 | return; |
2972 | ||
2973 | /* | |
2974 | * This documents exceptions given to allocations in certain | |
2975 | * contexts that are allowed to allocate outside current's set | |
2976 | * of allowed nodes. | |
2977 | */ | |
2978 | if (!(gfp_mask & __GFP_NOMEMALLOC)) | |
2979 | if (test_thread_flag(TIF_MEMDIE) || | |
2980 | (current->flags & (PF_MEMALLOC | PF_EXITING))) | |
2981 | filter &= ~SHOW_MEM_FILTER_NODES; | |
d0164adc | 2982 | if (in_interrupt() || !(gfp_mask & __GFP_DIRECT_RECLAIM)) |
a238ab5b DH |
2983 | filter &= ~SHOW_MEM_FILTER_NODES; |
2984 | ||
2985 | if (fmt) { | |
3ee9a4f0 JP |
2986 | struct va_format vaf; |
2987 | va_list args; | |
2988 | ||
a238ab5b | 2989 | va_start(args, fmt); |
3ee9a4f0 JP |
2990 | |
2991 | vaf.fmt = fmt; | |
2992 | vaf.va = &args; | |
2993 | ||
2994 | pr_warn("%pV", &vaf); | |
2995 | ||
a238ab5b DH |
2996 | va_end(args); |
2997 | } | |
2998 | ||
c5c990e8 VB |
2999 | pr_warn("%s: page allocation failure: order:%u, mode:%#x(%pGg)\n", |
3000 | current->comm, order, gfp_mask, &gfp_mask); | |
a238ab5b DH |
3001 | dump_stack(); |
3002 | if (!should_suppress_show_mem()) | |
3003 | show_mem(filter); | |
3004 | } | |
3005 | ||
11e33f6a MG |
3006 | static inline struct page * |
3007 | __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 3008 | const struct alloc_context *ac, unsigned long *did_some_progress) |
11e33f6a | 3009 | { |
6e0fc46d DR |
3010 | struct oom_control oc = { |
3011 | .zonelist = ac->zonelist, | |
3012 | .nodemask = ac->nodemask, | |
2a966b77 | 3013 | .memcg = NULL, |
6e0fc46d DR |
3014 | .gfp_mask = gfp_mask, |
3015 | .order = order, | |
6e0fc46d | 3016 | }; |
11e33f6a MG |
3017 | struct page *page; |
3018 | ||
9879de73 JW |
3019 | *did_some_progress = 0; |
3020 | ||
9879de73 | 3021 | /* |
dc56401f JW |
3022 | * Acquire the oom lock. If that fails, somebody else is |
3023 | * making progress for us. | |
9879de73 | 3024 | */ |
dc56401f | 3025 | if (!mutex_trylock(&oom_lock)) { |
9879de73 | 3026 | *did_some_progress = 1; |
11e33f6a | 3027 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
3028 | return NULL; |
3029 | } | |
6b1de916 | 3030 | |
11e33f6a MG |
3031 | /* |
3032 | * Go through the zonelist yet one more time, keep very high watermark | |
3033 | * here, this is only to catch a parallel oom killing, we must fail if | |
3034 | * we're still under heavy pressure. | |
3035 | */ | |
a9263751 VB |
3036 | page = get_page_from_freelist(gfp_mask | __GFP_HARDWALL, order, |
3037 | ALLOC_WMARK_HIGH|ALLOC_CPUSET, ac); | |
7fb1d9fc | 3038 | if (page) |
11e33f6a MG |
3039 | goto out; |
3040 | ||
4365a567 | 3041 | if (!(gfp_mask & __GFP_NOFAIL)) { |
9879de73 JW |
3042 | /* Coredumps can quickly deplete all memory reserves */ |
3043 | if (current->flags & PF_DUMPCORE) | |
3044 | goto out; | |
4365a567 KH |
3045 | /* The OOM killer will not help higher order allocs */ |
3046 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
3047 | goto out; | |
03668b3c | 3048 | /* The OOM killer does not needlessly kill tasks for lowmem */ |
a9263751 | 3049 | if (ac->high_zoneidx < ZONE_NORMAL) |
03668b3c | 3050 | goto out; |
9083905a JW |
3051 | if (pm_suspended_storage()) |
3052 | goto out; | |
3da88fb3 MH |
3053 | /* |
3054 | * XXX: GFP_NOFS allocations should rather fail than rely on | |
3055 | * other request to make a forward progress. | |
3056 | * We are in an unfortunate situation where out_of_memory cannot | |
3057 | * do much for this context but let's try it to at least get | |
3058 | * access to memory reserved if the current task is killed (see | |
3059 | * out_of_memory). Once filesystems are ready to handle allocation | |
3060 | * failures more gracefully we should just bail out here. | |
3061 | */ | |
3062 | ||
4167e9b2 | 3063 | /* The OOM killer may not free memory on a specific node */ |
4365a567 KH |
3064 | if (gfp_mask & __GFP_THISNODE) |
3065 | goto out; | |
3066 | } | |
11e33f6a | 3067 | /* Exhausted what can be done so it's blamo time */ |
5020e285 | 3068 | if (out_of_memory(&oc) || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) { |
c32b3cbe | 3069 | *did_some_progress = 1; |
5020e285 MH |
3070 | |
3071 | if (gfp_mask & __GFP_NOFAIL) { | |
3072 | page = get_page_from_freelist(gfp_mask, order, | |
3073 | ALLOC_NO_WATERMARKS|ALLOC_CPUSET, ac); | |
3074 | /* | |
3075 | * fallback to ignore cpuset restriction if our nodes | |
3076 | * are depleted | |
3077 | */ | |
3078 | if (!page) | |
3079 | page = get_page_from_freelist(gfp_mask, order, | |
3080 | ALLOC_NO_WATERMARKS, ac); | |
3081 | } | |
3082 | } | |
11e33f6a | 3083 | out: |
dc56401f | 3084 | mutex_unlock(&oom_lock); |
11e33f6a MG |
3085 | return page; |
3086 | } | |
3087 | ||
33c2d214 MH |
3088 | |
3089 | /* | |
3090 | * Maximum number of compaction retries wit a progress before OOM | |
3091 | * killer is consider as the only way to move forward. | |
3092 | */ | |
3093 | #define MAX_COMPACT_RETRIES 16 | |
3094 | ||
56de7263 MG |
3095 | #ifdef CONFIG_COMPACTION |
3096 | /* Try memory compaction for high-order allocations before reclaim */ | |
3097 | static struct page * | |
3098 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 3099 | unsigned int alloc_flags, const struct alloc_context *ac, |
c5d01d0d | 3100 | enum migrate_mode mode, enum compact_result *compact_result) |
56de7263 | 3101 | { |
98dd3b48 | 3102 | struct page *page; |
c5d01d0d | 3103 | int contended_compaction; |
53853e2d VB |
3104 | |
3105 | if (!order) | |
66199712 | 3106 | return NULL; |
66199712 | 3107 | |
c06b1fca | 3108 | current->flags |= PF_MEMALLOC; |
c5d01d0d MH |
3109 | *compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac, |
3110 | mode, &contended_compaction); | |
c06b1fca | 3111 | current->flags &= ~PF_MEMALLOC; |
56de7263 | 3112 | |
c5d01d0d | 3113 | if (*compact_result <= COMPACT_INACTIVE) |
98dd3b48 | 3114 | return NULL; |
53853e2d | 3115 | |
98dd3b48 VB |
3116 | /* |
3117 | * At least in one zone compaction wasn't deferred or skipped, so let's | |
3118 | * count a compaction stall | |
3119 | */ | |
3120 | count_vm_event(COMPACTSTALL); | |
8fb74b9f | 3121 | |
31a6c190 | 3122 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); |
53853e2d | 3123 | |
98dd3b48 VB |
3124 | if (page) { |
3125 | struct zone *zone = page_zone(page); | |
53853e2d | 3126 | |
98dd3b48 VB |
3127 | zone->compact_blockskip_flush = false; |
3128 | compaction_defer_reset(zone, order, true); | |
3129 | count_vm_event(COMPACTSUCCESS); | |
3130 | return page; | |
3131 | } | |
56de7263 | 3132 | |
98dd3b48 VB |
3133 | /* |
3134 | * It's bad if compaction run occurs and fails. The most likely reason | |
3135 | * is that pages exist, but not enough to satisfy watermarks. | |
3136 | */ | |
3137 | count_vm_event(COMPACTFAIL); | |
66199712 | 3138 | |
c5d01d0d MH |
3139 | /* |
3140 | * In all zones where compaction was attempted (and not | |
3141 | * deferred or skipped), lock contention has been detected. | |
3142 | * For THP allocation we do not want to disrupt the others | |
3143 | * so we fallback to base pages instead. | |
3144 | */ | |
3145 | if (contended_compaction == COMPACT_CONTENDED_LOCK) | |
3146 | *compact_result = COMPACT_CONTENDED; | |
3147 | ||
3148 | /* | |
3149 | * If compaction was aborted due to need_resched(), we do not | |
3150 | * want to further increase allocation latency, unless it is | |
3151 | * khugepaged trying to collapse. | |
3152 | */ | |
3153 | if (contended_compaction == COMPACT_CONTENDED_SCHED | |
3154 | && !(current->flags & PF_KTHREAD)) | |
3155 | *compact_result = COMPACT_CONTENDED; | |
3156 | ||
98dd3b48 | 3157 | cond_resched(); |
56de7263 MG |
3158 | |
3159 | return NULL; | |
3160 | } | |
33c2d214 MH |
3161 | |
3162 | static inline bool | |
86a294a8 MH |
3163 | should_compact_retry(struct alloc_context *ac, int order, int alloc_flags, |
3164 | enum compact_result compact_result, enum migrate_mode *migrate_mode, | |
33c2d214 MH |
3165 | int compaction_retries) |
3166 | { | |
7854ea6c MH |
3167 | int max_retries = MAX_COMPACT_RETRIES; |
3168 | ||
33c2d214 MH |
3169 | if (!order) |
3170 | return false; | |
3171 | ||
3172 | /* | |
3173 | * compaction considers all the zone as desperately out of memory | |
3174 | * so it doesn't really make much sense to retry except when the | |
3175 | * failure could be caused by weak migration mode. | |
3176 | */ | |
3177 | if (compaction_failed(compact_result)) { | |
3178 | if (*migrate_mode == MIGRATE_ASYNC) { | |
3179 | *migrate_mode = MIGRATE_SYNC_LIGHT; | |
3180 | return true; | |
3181 | } | |
3182 | return false; | |
3183 | } | |
3184 | ||
3185 | /* | |
7854ea6c MH |
3186 | * make sure the compaction wasn't deferred or didn't bail out early |
3187 | * due to locks contention before we declare that we should give up. | |
86a294a8 MH |
3188 | * But do not retry if the given zonelist is not suitable for |
3189 | * compaction. | |
33c2d214 | 3190 | */ |
7854ea6c | 3191 | if (compaction_withdrawn(compact_result)) |
86a294a8 | 3192 | return compaction_zonelist_suitable(ac, order, alloc_flags); |
7854ea6c MH |
3193 | |
3194 | /* | |
3195 | * !costly requests are much more important than __GFP_REPEAT | |
3196 | * costly ones because they are de facto nofail and invoke OOM | |
3197 | * killer to move on while costly can fail and users are ready | |
3198 | * to cope with that. 1/4 retries is rather arbitrary but we | |
3199 | * would need much more detailed feedback from compaction to | |
3200 | * make a better decision. | |
3201 | */ | |
3202 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
3203 | max_retries /= 4; | |
3204 | if (compaction_retries <= max_retries) | |
3205 | return true; | |
33c2d214 MH |
3206 | |
3207 | return false; | |
3208 | } | |
56de7263 MG |
3209 | #else |
3210 | static inline struct page * | |
3211 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 3212 | unsigned int alloc_flags, const struct alloc_context *ac, |
c5d01d0d | 3213 | enum migrate_mode mode, enum compact_result *compact_result) |
56de7263 | 3214 | { |
33c2d214 | 3215 | *compact_result = COMPACT_SKIPPED; |
56de7263 MG |
3216 | return NULL; |
3217 | } | |
33c2d214 MH |
3218 | |
3219 | static inline bool | |
86a294a8 MH |
3220 | should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_flags, |
3221 | enum compact_result compact_result, | |
33c2d214 MH |
3222 | enum migrate_mode *migrate_mode, |
3223 | int compaction_retries) | |
3224 | { | |
31e49bfd MH |
3225 | struct zone *zone; |
3226 | struct zoneref *z; | |
3227 | ||
3228 | if (!order || order > PAGE_ALLOC_COSTLY_ORDER) | |
3229 | return false; | |
3230 | ||
3231 | /* | |
3232 | * There are setups with compaction disabled which would prefer to loop | |
3233 | * inside the allocator rather than hit the oom killer prematurely. | |
3234 | * Let's give them a good hope and keep retrying while the order-0 | |
3235 | * watermarks are OK. | |
3236 | */ | |
3237 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, | |
3238 | ac->nodemask) { | |
3239 | if (zone_watermark_ok(zone, 0, min_wmark_pages(zone), | |
3240 | ac_classzone_idx(ac), alloc_flags)) | |
3241 | return true; | |
3242 | } | |
33c2d214 MH |
3243 | return false; |
3244 | } | |
56de7263 MG |
3245 | #endif /* CONFIG_COMPACTION */ |
3246 | ||
bba90710 MS |
3247 | /* Perform direct synchronous page reclaim */ |
3248 | static int | |
a9263751 VB |
3249 | __perform_reclaim(gfp_t gfp_mask, unsigned int order, |
3250 | const struct alloc_context *ac) | |
11e33f6a | 3251 | { |
11e33f6a | 3252 | struct reclaim_state reclaim_state; |
bba90710 | 3253 | int progress; |
11e33f6a MG |
3254 | |
3255 | cond_resched(); | |
3256 | ||
3257 | /* We now go into synchronous reclaim */ | |
3258 | cpuset_memory_pressure_bump(); | |
c06b1fca | 3259 | current->flags |= PF_MEMALLOC; |
11e33f6a MG |
3260 | lockdep_set_current_reclaim_state(gfp_mask); |
3261 | reclaim_state.reclaimed_slab = 0; | |
c06b1fca | 3262 | current->reclaim_state = &reclaim_state; |
11e33f6a | 3263 | |
a9263751 VB |
3264 | progress = try_to_free_pages(ac->zonelist, order, gfp_mask, |
3265 | ac->nodemask); | |
11e33f6a | 3266 | |
c06b1fca | 3267 | current->reclaim_state = NULL; |
11e33f6a | 3268 | lockdep_clear_current_reclaim_state(); |
c06b1fca | 3269 | current->flags &= ~PF_MEMALLOC; |
11e33f6a MG |
3270 | |
3271 | cond_resched(); | |
3272 | ||
bba90710 MS |
3273 | return progress; |
3274 | } | |
3275 | ||
3276 | /* The really slow allocator path where we enter direct reclaim */ | |
3277 | static inline struct page * | |
3278 | __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, | |
c603844b | 3279 | unsigned int alloc_flags, const struct alloc_context *ac, |
a9263751 | 3280 | unsigned long *did_some_progress) |
bba90710 MS |
3281 | { |
3282 | struct page *page = NULL; | |
3283 | bool drained = false; | |
3284 | ||
a9263751 | 3285 | *did_some_progress = __perform_reclaim(gfp_mask, order, ac); |
9ee493ce MG |
3286 | if (unlikely(!(*did_some_progress))) |
3287 | return NULL; | |
11e33f6a | 3288 | |
9ee493ce | 3289 | retry: |
31a6c190 | 3290 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); |
9ee493ce MG |
3291 | |
3292 | /* | |
3293 | * If an allocation failed after direct reclaim, it could be because | |
0aaa29a5 MG |
3294 | * pages are pinned on the per-cpu lists or in high alloc reserves. |
3295 | * Shrink them them and try again | |
9ee493ce MG |
3296 | */ |
3297 | if (!page && !drained) { | |
0aaa29a5 | 3298 | unreserve_highatomic_pageblock(ac); |
93481ff0 | 3299 | drain_all_pages(NULL); |
9ee493ce MG |
3300 | drained = true; |
3301 | goto retry; | |
3302 | } | |
3303 | ||
11e33f6a MG |
3304 | return page; |
3305 | } | |
3306 | ||
a9263751 | 3307 | static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) |
3a025760 JW |
3308 | { |
3309 | struct zoneref *z; | |
3310 | struct zone *zone; | |
e1a55637 | 3311 | pg_data_t *last_pgdat = NULL; |
3a025760 | 3312 | |
a9263751 | 3313 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
e1a55637 MG |
3314 | ac->high_zoneidx, ac->nodemask) { |
3315 | if (last_pgdat != zone->zone_pgdat) | |
52e9f87a | 3316 | wakeup_kswapd(zone, order, ac->high_zoneidx); |
e1a55637 MG |
3317 | last_pgdat = zone->zone_pgdat; |
3318 | } | |
3a025760 JW |
3319 | } |
3320 | ||
c603844b | 3321 | static inline unsigned int |
341ce06f PZ |
3322 | gfp_to_alloc_flags(gfp_t gfp_mask) |
3323 | { | |
c603844b | 3324 | unsigned int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; |
1da177e4 | 3325 | |
a56f57ff | 3326 | /* __GFP_HIGH is assumed to be the same as ALLOC_HIGH to save a branch. */ |
e6223a3b | 3327 | BUILD_BUG_ON(__GFP_HIGH != (__force gfp_t) ALLOC_HIGH); |
933e312e | 3328 | |
341ce06f PZ |
3329 | /* |
3330 | * The caller may dip into page reserves a bit more if the caller | |
3331 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
3332 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will | |
d0164adc | 3333 | * set both ALLOC_HARDER (__GFP_ATOMIC) and ALLOC_HIGH (__GFP_HIGH). |
341ce06f | 3334 | */ |
e6223a3b | 3335 | alloc_flags |= (__force int) (gfp_mask & __GFP_HIGH); |
1da177e4 | 3336 | |
d0164adc | 3337 | if (gfp_mask & __GFP_ATOMIC) { |
5c3240d9 | 3338 | /* |
b104a35d DR |
3339 | * Not worth trying to allocate harder for __GFP_NOMEMALLOC even |
3340 | * if it can't schedule. | |
5c3240d9 | 3341 | */ |
b104a35d | 3342 | if (!(gfp_mask & __GFP_NOMEMALLOC)) |
5c3240d9 | 3343 | alloc_flags |= ALLOC_HARDER; |
523b9458 | 3344 | /* |
b104a35d | 3345 | * Ignore cpuset mems for GFP_ATOMIC rather than fail, see the |
344736f2 | 3346 | * comment for __cpuset_node_allowed(). |
523b9458 | 3347 | */ |
341ce06f | 3348 | alloc_flags &= ~ALLOC_CPUSET; |
c06b1fca | 3349 | } else if (unlikely(rt_task(current)) && !in_interrupt()) |
341ce06f PZ |
3350 | alloc_flags |= ALLOC_HARDER; |
3351 | ||
d95ea5d1 | 3352 | #ifdef CONFIG_CMA |
43e7a34d | 3353 | if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE) |
d95ea5d1 BZ |
3354 | alloc_flags |= ALLOC_CMA; |
3355 | #endif | |
341ce06f PZ |
3356 | return alloc_flags; |
3357 | } | |
3358 | ||
072bb0aa MG |
3359 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) |
3360 | { | |
31a6c190 VB |
3361 | if (unlikely(gfp_mask & __GFP_NOMEMALLOC)) |
3362 | return false; | |
3363 | ||
3364 | if (gfp_mask & __GFP_MEMALLOC) | |
3365 | return true; | |
3366 | if (in_serving_softirq() && (current->flags & PF_MEMALLOC)) | |
3367 | return true; | |
3368 | if (!in_interrupt() && | |
3369 | ((current->flags & PF_MEMALLOC) || | |
3370 | unlikely(test_thread_flag(TIF_MEMDIE)))) | |
3371 | return true; | |
3372 | ||
3373 | return false; | |
072bb0aa MG |
3374 | } |
3375 | ||
d0164adc MG |
3376 | static inline bool is_thp_gfp_mask(gfp_t gfp_mask) |
3377 | { | |
3378 | return (gfp_mask & (GFP_TRANSHUGE | __GFP_KSWAPD_RECLAIM)) == GFP_TRANSHUGE; | |
3379 | } | |
3380 | ||
0a0337e0 MH |
3381 | /* |
3382 | * Maximum number of reclaim retries without any progress before OOM killer | |
3383 | * is consider as the only way to move forward. | |
3384 | */ | |
3385 | #define MAX_RECLAIM_RETRIES 16 | |
3386 | ||
3387 | /* | |
3388 | * Checks whether it makes sense to retry the reclaim to make a forward progress | |
3389 | * for the given allocation request. | |
3390 | * The reclaim feedback represented by did_some_progress (any progress during | |
7854ea6c MH |
3391 | * the last reclaim round) and no_progress_loops (number of reclaim rounds without |
3392 | * any progress in a row) is considered as well as the reclaimable pages on the | |
3393 | * applicable zone list (with a backoff mechanism which is a function of | |
3394 | * no_progress_loops). | |
0a0337e0 MH |
3395 | * |
3396 | * Returns true if a retry is viable or false to enter the oom path. | |
3397 | */ | |
3398 | static inline bool | |
3399 | should_reclaim_retry(gfp_t gfp_mask, unsigned order, | |
3400 | struct alloc_context *ac, int alloc_flags, | |
7854ea6c | 3401 | bool did_some_progress, int no_progress_loops) |
0a0337e0 MH |
3402 | { |
3403 | struct zone *zone; | |
3404 | struct zoneref *z; | |
3405 | ||
3406 | /* | |
3407 | * Make sure we converge to OOM if we cannot make any progress | |
3408 | * several times in the row. | |
3409 | */ | |
3410 | if (no_progress_loops > MAX_RECLAIM_RETRIES) | |
3411 | return false; | |
3412 | ||
bca67592 MG |
3413 | /* |
3414 | * Keep reclaiming pages while there is a chance this will lead | |
3415 | * somewhere. If none of the target zones can satisfy our allocation | |
3416 | * request even if all reclaimable pages are considered then we are | |
3417 | * screwed and have to go OOM. | |
0a0337e0 MH |
3418 | */ |
3419 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, | |
3420 | ac->nodemask) { | |
3421 | unsigned long available; | |
ede37713 | 3422 | unsigned long reclaimable; |
0a0337e0 | 3423 | |
5a1c84b4 | 3424 | available = reclaimable = zone_reclaimable_pages(zone); |
0a0337e0 MH |
3425 | available -= DIV_ROUND_UP(no_progress_loops * available, |
3426 | MAX_RECLAIM_RETRIES); | |
5a1c84b4 | 3427 | available += zone_page_state_snapshot(zone, NR_FREE_PAGES); |
0a0337e0 MH |
3428 | |
3429 | /* | |
3430 | * Would the allocation succeed if we reclaimed the whole | |
5a1c84b4 | 3431 | * available? |
0a0337e0 | 3432 | */ |
5a1c84b4 MG |
3433 | if (__zone_watermark_ok(zone, order, min_wmark_pages(zone), |
3434 | ac_classzone_idx(ac), alloc_flags, available)) { | |
ede37713 MH |
3435 | /* |
3436 | * If we didn't make any progress and have a lot of | |
3437 | * dirty + writeback pages then we should wait for | |
3438 | * an IO to complete to slow down the reclaim and | |
3439 | * prevent from pre mature OOM | |
3440 | */ | |
3441 | if (!did_some_progress) { | |
11fb9989 | 3442 | unsigned long write_pending; |
ede37713 | 3443 | |
5a1c84b4 MG |
3444 | write_pending = zone_page_state_snapshot(zone, |
3445 | NR_ZONE_WRITE_PENDING); | |
ede37713 | 3446 | |
11fb9989 | 3447 | if (2 * write_pending > reclaimable) { |
ede37713 MH |
3448 | congestion_wait(BLK_RW_ASYNC, HZ/10); |
3449 | return true; | |
3450 | } | |
3451 | } | |
5a1c84b4 | 3452 | |
ede37713 MH |
3453 | /* |
3454 | * Memory allocation/reclaim might be called from a WQ | |
3455 | * context and the current implementation of the WQ | |
3456 | * concurrency control doesn't recognize that | |
3457 | * a particular WQ is congested if the worker thread is | |
3458 | * looping without ever sleeping. Therefore we have to | |
3459 | * do a short sleep here rather than calling | |
3460 | * cond_resched(). | |
3461 | */ | |
3462 | if (current->flags & PF_WQ_WORKER) | |
3463 | schedule_timeout_uninterruptible(1); | |
3464 | else | |
3465 | cond_resched(); | |
3466 | ||
0a0337e0 MH |
3467 | return true; |
3468 | } | |
3469 | } | |
3470 | ||
3471 | return false; | |
3472 | } | |
3473 | ||
11e33f6a MG |
3474 | static inline struct page * |
3475 | __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 3476 | struct alloc_context *ac) |
11e33f6a | 3477 | { |
d0164adc | 3478 | bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM; |
11e33f6a | 3479 | struct page *page = NULL; |
c603844b | 3480 | unsigned int alloc_flags; |
11e33f6a | 3481 | unsigned long did_some_progress; |
a8161d1e | 3482 | enum migrate_mode migration_mode = MIGRATE_SYNC_LIGHT; |
c5d01d0d | 3483 | enum compact_result compact_result; |
33c2d214 | 3484 | int compaction_retries = 0; |
0a0337e0 | 3485 | int no_progress_loops = 0; |
1da177e4 | 3486 | |
72807a74 MG |
3487 | /* |
3488 | * In the slowpath, we sanity check order to avoid ever trying to | |
3489 | * reclaim >= MAX_ORDER areas which will never succeed. Callers may | |
3490 | * be using allocators in order of preference for an area that is | |
3491 | * too large. | |
3492 | */ | |
1fc28b70 MG |
3493 | if (order >= MAX_ORDER) { |
3494 | WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN)); | |
72807a74 | 3495 | return NULL; |
1fc28b70 | 3496 | } |
1da177e4 | 3497 | |
d0164adc MG |
3498 | /* |
3499 | * We also sanity check to catch abuse of atomic reserves being used by | |
3500 | * callers that are not in atomic context. | |
3501 | */ | |
3502 | if (WARN_ON_ONCE((gfp_mask & (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM)) == | |
3503 | (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM))) | |
3504 | gfp_mask &= ~__GFP_ATOMIC; | |
3505 | ||
9bf2229f | 3506 | /* |
31a6c190 VB |
3507 | * The fast path uses conservative alloc_flags to succeed only until |
3508 | * kswapd needs to be woken up, and to avoid the cost of setting up | |
3509 | * alloc_flags precisely. So we do that now. | |
9bf2229f | 3510 | */ |
341ce06f | 3511 | alloc_flags = gfp_to_alloc_flags(gfp_mask); |
1da177e4 | 3512 | |
23771235 VB |
3513 | if (gfp_mask & __GFP_KSWAPD_RECLAIM) |
3514 | wake_all_kswapds(order, ac); | |
3515 | ||
3516 | /* | |
3517 | * The adjusted alloc_flags might result in immediate success, so try | |
3518 | * that first | |
3519 | */ | |
3520 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); | |
3521 | if (page) | |
3522 | goto got_pg; | |
3523 | ||
a8161d1e VB |
3524 | /* |
3525 | * For costly allocations, try direct compaction first, as it's likely | |
3526 | * that we have enough base pages and don't need to reclaim. Don't try | |
3527 | * that for allocations that are allowed to ignore watermarks, as the | |
3528 | * ALLOC_NO_WATERMARKS attempt didn't yet happen. | |
3529 | */ | |
3530 | if (can_direct_reclaim && order > PAGE_ALLOC_COSTLY_ORDER && | |
3531 | !gfp_pfmemalloc_allowed(gfp_mask)) { | |
3532 | page = __alloc_pages_direct_compact(gfp_mask, order, | |
3533 | alloc_flags, ac, | |
3534 | MIGRATE_ASYNC, | |
3535 | &compact_result); | |
3536 | if (page) | |
3537 | goto got_pg; | |
3538 | ||
3539 | /* Checks for THP-specific high-order allocations */ | |
3540 | if (is_thp_gfp_mask(gfp_mask)) { | |
3541 | /* | |
3542 | * If compaction is deferred for high-order allocations, | |
3543 | * it is because sync compaction recently failed. If | |
3544 | * this is the case and the caller requested a THP | |
3545 | * allocation, we do not want to heavily disrupt the | |
3546 | * system, so we fail the allocation instead of entering | |
3547 | * direct reclaim. | |
3548 | */ | |
3549 | if (compact_result == COMPACT_DEFERRED) | |
3550 | goto nopage; | |
3551 | ||
3552 | /* | |
3553 | * Compaction is contended so rather back off than cause | |
3554 | * excessive stalls. | |
3555 | */ | |
3556 | if (compact_result == COMPACT_CONTENDED) | |
3557 | goto nopage; | |
3558 | ||
3559 | /* | |
3560 | * It can become very expensive to allocate transparent | |
3561 | * hugepages at fault, so use asynchronous memory | |
3562 | * compaction for THP unless it is khugepaged trying to | |
3563 | * collapse. All other requests should tolerate at | |
3564 | * least light sync migration. | |
3565 | */ | |
3566 | if (!(current->flags & PF_KTHREAD)) | |
3567 | migration_mode = MIGRATE_ASYNC; | |
3568 | } | |
3569 | } | |
23771235 | 3570 | |
31a6c190 | 3571 | retry: |
23771235 | 3572 | /* Ensure kswapd doesn't accidentally go to sleep as long as we loop */ |
31a6c190 VB |
3573 | if (gfp_mask & __GFP_KSWAPD_RECLAIM) |
3574 | wake_all_kswapds(order, ac); | |
3575 | ||
23771235 VB |
3576 | if (gfp_pfmemalloc_allowed(gfp_mask)) |
3577 | alloc_flags = ALLOC_NO_WATERMARKS; | |
3578 | ||
e46e7b77 MG |
3579 | /* |
3580 | * Reset the zonelist iterators if memory policies can be ignored. | |
3581 | * These allocations are high priority and system rather than user | |
3582 | * orientated. | |
3583 | */ | |
23771235 | 3584 | if (!(alloc_flags & ALLOC_CPUSET) || (alloc_flags & ALLOC_NO_WATERMARKS)) { |
e46e7b77 MG |
3585 | ac->zonelist = node_zonelist(numa_node_id(), gfp_mask); |
3586 | ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, | |
3587 | ac->high_zoneidx, ac->nodemask); | |
3588 | } | |
3589 | ||
23771235 | 3590 | /* Attempt with potentially adjusted zonelist and alloc_flags */ |
31a6c190 | 3591 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); |
7fb1d9fc RS |
3592 | if (page) |
3593 | goto got_pg; | |
1da177e4 | 3594 | |
d0164adc MG |
3595 | /* Caller is not willing to reclaim, we can't balance anything */ |
3596 | if (!can_direct_reclaim) { | |
aed0a0e3 | 3597 | /* |
33d53103 MH |
3598 | * All existing users of the __GFP_NOFAIL are blockable, so warn |
3599 | * of any new users that actually allow this type of allocation | |
3600 | * to fail. | |
aed0a0e3 DR |
3601 | */ |
3602 | WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL); | |
1da177e4 | 3603 | goto nopage; |
aed0a0e3 | 3604 | } |
1da177e4 | 3605 | |
341ce06f | 3606 | /* Avoid recursion of direct reclaim */ |
33d53103 MH |
3607 | if (current->flags & PF_MEMALLOC) { |
3608 | /* | |
3609 | * __GFP_NOFAIL request from this context is rather bizarre | |
3610 | * because we cannot reclaim anything and only can loop waiting | |
3611 | * for somebody to do a work for us. | |
3612 | */ | |
3613 | if (WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) { | |
3614 | cond_resched(); | |
3615 | goto retry; | |
3616 | } | |
341ce06f | 3617 | goto nopage; |
33d53103 | 3618 | } |
341ce06f | 3619 | |
6583bb64 DR |
3620 | /* Avoid allocations with no watermarks from looping endlessly */ |
3621 | if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL)) | |
3622 | goto nopage; | |
3623 | ||
a8161d1e VB |
3624 | |
3625 | /* Try direct reclaim and then allocating */ | |
3626 | page = __alloc_pages_direct_reclaim(gfp_mask, order, alloc_flags, ac, | |
3627 | &did_some_progress); | |
3628 | if (page) | |
3629 | goto got_pg; | |
3630 | ||
3631 | /* Try direct compaction and then allocating */ | |
a9263751 VB |
3632 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac, |
3633 | migration_mode, | |
c5d01d0d | 3634 | &compact_result); |
56de7263 MG |
3635 | if (page) |
3636 | goto got_pg; | |
75f30861 | 3637 | |
33c2d214 MH |
3638 | if (order && compaction_made_progress(compact_result)) |
3639 | compaction_retries++; | |
8fe78048 | 3640 | |
9083905a JW |
3641 | /* Do not loop if specifically requested */ |
3642 | if (gfp_mask & __GFP_NORETRY) | |
a8161d1e | 3643 | goto nopage; |
9083905a | 3644 | |
0a0337e0 MH |
3645 | /* |
3646 | * Do not retry costly high order allocations unless they are | |
3647 | * __GFP_REPEAT | |
3648 | */ | |
3649 | if (order > PAGE_ALLOC_COSTLY_ORDER && !(gfp_mask & __GFP_REPEAT)) | |
a8161d1e | 3650 | goto nopage; |
0a0337e0 | 3651 | |
7854ea6c MH |
3652 | /* |
3653 | * Costly allocations might have made a progress but this doesn't mean | |
3654 | * their order will become available due to high fragmentation so | |
3655 | * always increment the no progress counter for them | |
3656 | */ | |
3657 | if (did_some_progress && order <= PAGE_ALLOC_COSTLY_ORDER) | |
0a0337e0 | 3658 | no_progress_loops = 0; |
7854ea6c | 3659 | else |
0a0337e0 | 3660 | no_progress_loops++; |
1da177e4 | 3661 | |
0a0337e0 | 3662 | if (should_reclaim_retry(gfp_mask, order, ac, alloc_flags, |
7854ea6c | 3663 | did_some_progress > 0, no_progress_loops)) |
0a0337e0 MH |
3664 | goto retry; |
3665 | ||
33c2d214 MH |
3666 | /* |
3667 | * It doesn't make any sense to retry for the compaction if the order-0 | |
3668 | * reclaim is not able to make any progress because the current | |
3669 | * implementation of the compaction depends on the sufficient amount | |
3670 | * of free memory (see __compaction_suitable) | |
3671 | */ | |
3672 | if (did_some_progress > 0 && | |
86a294a8 MH |
3673 | should_compact_retry(ac, order, alloc_flags, |
3674 | compact_result, &migration_mode, | |
3675 | compaction_retries)) | |
33c2d214 MH |
3676 | goto retry; |
3677 | ||
9083905a JW |
3678 | /* Reclaim has failed us, start killing things */ |
3679 | page = __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress); | |
3680 | if (page) | |
3681 | goto got_pg; | |
3682 | ||
3683 | /* Retry as long as the OOM killer is making progress */ | |
0a0337e0 MH |
3684 | if (did_some_progress) { |
3685 | no_progress_loops = 0; | |
9083905a | 3686 | goto retry; |
0a0337e0 | 3687 | } |
9083905a | 3688 | |
1da177e4 | 3689 | nopage: |
a238ab5b | 3690 | warn_alloc_failed(gfp_mask, order, NULL); |
1da177e4 | 3691 | got_pg: |
072bb0aa | 3692 | return page; |
1da177e4 | 3693 | } |
11e33f6a MG |
3694 | |
3695 | /* | |
3696 | * This is the 'heart' of the zoned buddy allocator. | |
3697 | */ | |
3698 | struct page * | |
3699 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, | |
3700 | struct zonelist *zonelist, nodemask_t *nodemask) | |
3701 | { | |
5bb1b169 | 3702 | struct page *page; |
cc9a6c87 | 3703 | unsigned int cpuset_mems_cookie; |
e6cbd7f2 | 3704 | unsigned int alloc_flags = ALLOC_WMARK_LOW; |
83d4ca81 | 3705 | gfp_t alloc_mask = gfp_mask; /* The gfp_t that was actually used for allocation */ |
a9263751 VB |
3706 | struct alloc_context ac = { |
3707 | .high_zoneidx = gfp_zone(gfp_mask), | |
682a3385 | 3708 | .zonelist = zonelist, |
a9263751 VB |
3709 | .nodemask = nodemask, |
3710 | .migratetype = gfpflags_to_migratetype(gfp_mask), | |
3711 | }; | |
11e33f6a | 3712 | |
682a3385 | 3713 | if (cpusets_enabled()) { |
83d4ca81 | 3714 | alloc_mask |= __GFP_HARDWALL; |
682a3385 MG |
3715 | alloc_flags |= ALLOC_CPUSET; |
3716 | if (!ac.nodemask) | |
3717 | ac.nodemask = &cpuset_current_mems_allowed; | |
3718 | } | |
3719 | ||
dcce284a BH |
3720 | gfp_mask &= gfp_allowed_mask; |
3721 | ||
11e33f6a MG |
3722 | lockdep_trace_alloc(gfp_mask); |
3723 | ||
d0164adc | 3724 | might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM); |
11e33f6a MG |
3725 | |
3726 | if (should_fail_alloc_page(gfp_mask, order)) | |
3727 | return NULL; | |
3728 | ||
3729 | /* | |
3730 | * Check the zones suitable for the gfp_mask contain at least one | |
3731 | * valid zone. It's possible to have an empty zonelist as a result | |
4167e9b2 | 3732 | * of __GFP_THISNODE and a memoryless node |
11e33f6a MG |
3733 | */ |
3734 | if (unlikely(!zonelist->_zonerefs->zone)) | |
3735 | return NULL; | |
3736 | ||
a9263751 | 3737 | if (IS_ENABLED(CONFIG_CMA) && ac.migratetype == MIGRATE_MOVABLE) |
21bb9bd1 VB |
3738 | alloc_flags |= ALLOC_CMA; |
3739 | ||
cc9a6c87 | 3740 | retry_cpuset: |
d26914d1 | 3741 | cpuset_mems_cookie = read_mems_allowed_begin(); |
cc9a6c87 | 3742 | |
c9ab0c4f MG |
3743 | /* Dirty zone balancing only done in the fast path */ |
3744 | ac.spread_dirty_pages = (gfp_mask & __GFP_WRITE); | |
3745 | ||
e46e7b77 MG |
3746 | /* |
3747 | * The preferred zone is used for statistics but crucially it is | |
3748 | * also used as the starting point for the zonelist iterator. It | |
3749 | * may get reset for allocations that ignore memory policies. | |
3750 | */ | |
c33d6c06 MG |
3751 | ac.preferred_zoneref = first_zones_zonelist(ac.zonelist, |
3752 | ac.high_zoneidx, ac.nodemask); | |
3753 | if (!ac.preferred_zoneref) { | |
5bb1b169 | 3754 | page = NULL; |
4fcb0971 | 3755 | goto no_zone; |
5bb1b169 MG |
3756 | } |
3757 | ||
5117f45d | 3758 | /* First allocation attempt */ |
a9263751 | 3759 | page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac); |
4fcb0971 MG |
3760 | if (likely(page)) |
3761 | goto out; | |
11e33f6a | 3762 | |
4fcb0971 MG |
3763 | /* |
3764 | * Runtime PM, block IO and its error handling path can deadlock | |
3765 | * because I/O on the device might not complete. | |
3766 | */ | |
3767 | alloc_mask = memalloc_noio_flags(gfp_mask); | |
3768 | ac.spread_dirty_pages = false; | |
23f086f9 | 3769 | |
4741526b MG |
3770 | /* |
3771 | * Restore the original nodemask if it was potentially replaced with | |
3772 | * &cpuset_current_mems_allowed to optimize the fast-path attempt. | |
3773 | */ | |
3774 | if (cpusets_enabled()) | |
3775 | ac.nodemask = nodemask; | |
4fcb0971 | 3776 | page = __alloc_pages_slowpath(alloc_mask, order, &ac); |
cc9a6c87 | 3777 | |
4fcb0971 | 3778 | no_zone: |
cc9a6c87 MG |
3779 | /* |
3780 | * When updating a task's mems_allowed, it is possible to race with | |
3781 | * parallel threads in such a way that an allocation can fail while | |
3782 | * the mask is being updated. If a page allocation is about to fail, | |
3783 | * check if the cpuset changed during allocation and if so, retry. | |
3784 | */ | |
83d4ca81 MG |
3785 | if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) { |
3786 | alloc_mask = gfp_mask; | |
cc9a6c87 | 3787 | goto retry_cpuset; |
83d4ca81 | 3788 | } |
cc9a6c87 | 3789 | |
4fcb0971 | 3790 | out: |
4949148a VD |
3791 | if (memcg_kmem_enabled() && (gfp_mask & __GFP_ACCOUNT) && page) { |
3792 | if (unlikely(memcg_kmem_charge(page, gfp_mask, order))) { | |
3793 | __free_pages(page, order); | |
3794 | page = NULL; | |
3795 | } else | |
3796 | __SetPageKmemcg(page); | |
3797 | } | |
3798 | ||
4fcb0971 MG |
3799 | if (kmemcheck_enabled && page) |
3800 | kmemcheck_pagealloc_alloc(page, order, gfp_mask); | |
3801 | ||
3802 | trace_mm_page_alloc(page, order, alloc_mask, ac.migratetype); | |
3803 | ||
11e33f6a | 3804 | return page; |
1da177e4 | 3805 | } |
d239171e | 3806 | EXPORT_SYMBOL(__alloc_pages_nodemask); |
1da177e4 LT |
3807 | |
3808 | /* | |
3809 | * Common helper functions. | |
3810 | */ | |
920c7a5d | 3811 | unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 3812 | { |
945a1113 AM |
3813 | struct page *page; |
3814 | ||
3815 | /* | |
3816 | * __get_free_pages() returns a 32-bit address, which cannot represent | |
3817 | * a highmem page | |
3818 | */ | |
3819 | VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); | |
3820 | ||
1da177e4 LT |
3821 | page = alloc_pages(gfp_mask, order); |
3822 | if (!page) | |
3823 | return 0; | |
3824 | return (unsigned long) page_address(page); | |
3825 | } | |
1da177e4 LT |
3826 | EXPORT_SYMBOL(__get_free_pages); |
3827 | ||
920c7a5d | 3828 | unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 | 3829 | { |
945a1113 | 3830 | return __get_free_pages(gfp_mask | __GFP_ZERO, 0); |
1da177e4 | 3831 | } |
1da177e4 LT |
3832 | EXPORT_SYMBOL(get_zeroed_page); |
3833 | ||
920c7a5d | 3834 | void __free_pages(struct page *page, unsigned int order) |
1da177e4 | 3835 | { |
b5810039 | 3836 | if (put_page_testzero(page)) { |
1da177e4 | 3837 | if (order == 0) |
b745bc85 | 3838 | free_hot_cold_page(page, false); |
1da177e4 LT |
3839 | else |
3840 | __free_pages_ok(page, order); | |
3841 | } | |
3842 | } | |
3843 | ||
3844 | EXPORT_SYMBOL(__free_pages); | |
3845 | ||
920c7a5d | 3846 | void free_pages(unsigned long addr, unsigned int order) |
1da177e4 LT |
3847 | { |
3848 | if (addr != 0) { | |
725d704e | 3849 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
3850 | __free_pages(virt_to_page((void *)addr), order); |
3851 | } | |
3852 | } | |
3853 | ||
3854 | EXPORT_SYMBOL(free_pages); | |
3855 | ||
b63ae8ca AD |
3856 | /* |
3857 | * Page Fragment: | |
3858 | * An arbitrary-length arbitrary-offset area of memory which resides | |
3859 | * within a 0 or higher order page. Multiple fragments within that page | |
3860 | * are individually refcounted, in the page's reference counter. | |
3861 | * | |
3862 | * The page_frag functions below provide a simple allocation framework for | |
3863 | * page fragments. This is used by the network stack and network device | |
3864 | * drivers to provide a backing region of memory for use as either an | |
3865 | * sk_buff->head, or to be used in the "frags" portion of skb_shared_info. | |
3866 | */ | |
3867 | static struct page *__page_frag_refill(struct page_frag_cache *nc, | |
3868 | gfp_t gfp_mask) | |
3869 | { | |
3870 | struct page *page = NULL; | |
3871 | gfp_t gfp = gfp_mask; | |
3872 | ||
3873 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3874 | gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY | | |
3875 | __GFP_NOMEMALLOC; | |
3876 | page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, | |
3877 | PAGE_FRAG_CACHE_MAX_ORDER); | |
3878 | nc->size = page ? PAGE_FRAG_CACHE_MAX_SIZE : PAGE_SIZE; | |
3879 | #endif | |
3880 | if (unlikely(!page)) | |
3881 | page = alloc_pages_node(NUMA_NO_NODE, gfp, 0); | |
3882 | ||
3883 | nc->va = page ? page_address(page) : NULL; | |
3884 | ||
3885 | return page; | |
3886 | } | |
3887 | ||
3888 | void *__alloc_page_frag(struct page_frag_cache *nc, | |
3889 | unsigned int fragsz, gfp_t gfp_mask) | |
3890 | { | |
3891 | unsigned int size = PAGE_SIZE; | |
3892 | struct page *page; | |
3893 | int offset; | |
3894 | ||
3895 | if (unlikely(!nc->va)) { | |
3896 | refill: | |
3897 | page = __page_frag_refill(nc, gfp_mask); | |
3898 | if (!page) | |
3899 | return NULL; | |
3900 | ||
3901 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3902 | /* if size can vary use size else just use PAGE_SIZE */ | |
3903 | size = nc->size; | |
3904 | #endif | |
3905 | /* Even if we own the page, we do not use atomic_set(). | |
3906 | * This would break get_page_unless_zero() users. | |
3907 | */ | |
fe896d18 | 3908 | page_ref_add(page, size - 1); |
b63ae8ca AD |
3909 | |
3910 | /* reset page count bias and offset to start of new frag */ | |
2f064f34 | 3911 | nc->pfmemalloc = page_is_pfmemalloc(page); |
b63ae8ca AD |
3912 | nc->pagecnt_bias = size; |
3913 | nc->offset = size; | |
3914 | } | |
3915 | ||
3916 | offset = nc->offset - fragsz; | |
3917 | if (unlikely(offset < 0)) { | |
3918 | page = virt_to_page(nc->va); | |
3919 | ||
fe896d18 | 3920 | if (!page_ref_sub_and_test(page, nc->pagecnt_bias)) |
b63ae8ca AD |
3921 | goto refill; |
3922 | ||
3923 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
3924 | /* if size can vary use size else just use PAGE_SIZE */ | |
3925 | size = nc->size; | |
3926 | #endif | |
3927 | /* OK, page count is 0, we can safely set it */ | |
fe896d18 | 3928 | set_page_count(page, size); |
b63ae8ca AD |
3929 | |
3930 | /* reset page count bias and offset to start of new frag */ | |
3931 | nc->pagecnt_bias = size; | |
3932 | offset = size - fragsz; | |
3933 | } | |
3934 | ||
3935 | nc->pagecnt_bias--; | |
3936 | nc->offset = offset; | |
3937 | ||
3938 | return nc->va + offset; | |
3939 | } | |
3940 | EXPORT_SYMBOL(__alloc_page_frag); | |
3941 | ||
3942 | /* | |
3943 | * Frees a page fragment allocated out of either a compound or order 0 page. | |
3944 | */ | |
3945 | void __free_page_frag(void *addr) | |
3946 | { | |
3947 | struct page *page = virt_to_head_page(addr); | |
3948 | ||
3949 | if (unlikely(put_page_testzero(page))) | |
3950 | __free_pages_ok(page, compound_order(page)); | |
3951 | } | |
3952 | EXPORT_SYMBOL(__free_page_frag); | |
3953 | ||
d00181b9 KS |
3954 | static void *make_alloc_exact(unsigned long addr, unsigned int order, |
3955 | size_t size) | |
ee85c2e1 AK |
3956 | { |
3957 | if (addr) { | |
3958 | unsigned long alloc_end = addr + (PAGE_SIZE << order); | |
3959 | unsigned long used = addr + PAGE_ALIGN(size); | |
3960 | ||
3961 | split_page(virt_to_page((void *)addr), order); | |
3962 | while (used < alloc_end) { | |
3963 | free_page(used); | |
3964 | used += PAGE_SIZE; | |
3965 | } | |
3966 | } | |
3967 | return (void *)addr; | |
3968 | } | |
3969 | ||
2be0ffe2 TT |
3970 | /** |
3971 | * alloc_pages_exact - allocate an exact number physically-contiguous pages. | |
3972 | * @size: the number of bytes to allocate | |
3973 | * @gfp_mask: GFP flags for the allocation | |
3974 | * | |
3975 | * This function is similar to alloc_pages(), except that it allocates the | |
3976 | * minimum number of pages to satisfy the request. alloc_pages() can only | |
3977 | * allocate memory in power-of-two pages. | |
3978 | * | |
3979 | * This function is also limited by MAX_ORDER. | |
3980 | * | |
3981 | * Memory allocated by this function must be released by free_pages_exact(). | |
3982 | */ | |
3983 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask) | |
3984 | { | |
3985 | unsigned int order = get_order(size); | |
3986 | unsigned long addr; | |
3987 | ||
3988 | addr = __get_free_pages(gfp_mask, order); | |
ee85c2e1 | 3989 | return make_alloc_exact(addr, order, size); |
2be0ffe2 TT |
3990 | } |
3991 | EXPORT_SYMBOL(alloc_pages_exact); | |
3992 | ||
ee85c2e1 AK |
3993 | /** |
3994 | * alloc_pages_exact_nid - allocate an exact number of physically-contiguous | |
3995 | * pages on a node. | |
b5e6ab58 | 3996 | * @nid: the preferred node ID where memory should be allocated |
ee85c2e1 AK |
3997 | * @size: the number of bytes to allocate |
3998 | * @gfp_mask: GFP flags for the allocation | |
3999 | * | |
4000 | * Like alloc_pages_exact(), but try to allocate on node nid first before falling | |
4001 | * back. | |
ee85c2e1 | 4002 | */ |
e1931811 | 4003 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) |
ee85c2e1 | 4004 | { |
d00181b9 | 4005 | unsigned int order = get_order(size); |
ee85c2e1 AK |
4006 | struct page *p = alloc_pages_node(nid, gfp_mask, order); |
4007 | if (!p) | |
4008 | return NULL; | |
4009 | return make_alloc_exact((unsigned long)page_address(p), order, size); | |
4010 | } | |
ee85c2e1 | 4011 | |
2be0ffe2 TT |
4012 | /** |
4013 | * free_pages_exact - release memory allocated via alloc_pages_exact() | |
4014 | * @virt: the value returned by alloc_pages_exact. | |
4015 | * @size: size of allocation, same value as passed to alloc_pages_exact(). | |
4016 | * | |
4017 | * Release the memory allocated by a previous call to alloc_pages_exact. | |
4018 | */ | |
4019 | void free_pages_exact(void *virt, size_t size) | |
4020 | { | |
4021 | unsigned long addr = (unsigned long)virt; | |
4022 | unsigned long end = addr + PAGE_ALIGN(size); | |
4023 | ||
4024 | while (addr < end) { | |
4025 | free_page(addr); | |
4026 | addr += PAGE_SIZE; | |
4027 | } | |
4028 | } | |
4029 | EXPORT_SYMBOL(free_pages_exact); | |
4030 | ||
e0fb5815 ZY |
4031 | /** |
4032 | * nr_free_zone_pages - count number of pages beyond high watermark | |
4033 | * @offset: The zone index of the highest zone | |
4034 | * | |
4035 | * nr_free_zone_pages() counts the number of counts pages which are beyond the | |
4036 | * high watermark within all zones at or below a given zone index. For each | |
4037 | * zone, the number of pages is calculated as: | |
834405c3 | 4038 | * managed_pages - high_pages |
e0fb5815 | 4039 | */ |
ebec3862 | 4040 | static unsigned long nr_free_zone_pages(int offset) |
1da177e4 | 4041 | { |
dd1a239f | 4042 | struct zoneref *z; |
54a6eb5c MG |
4043 | struct zone *zone; |
4044 | ||
e310fd43 | 4045 | /* Just pick one node, since fallback list is circular */ |
ebec3862 | 4046 | unsigned long sum = 0; |
1da177e4 | 4047 | |
0e88460d | 4048 | struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); |
1da177e4 | 4049 | |
54a6eb5c | 4050 | for_each_zone_zonelist(zone, z, zonelist, offset) { |
b40da049 | 4051 | unsigned long size = zone->managed_pages; |
41858966 | 4052 | unsigned long high = high_wmark_pages(zone); |
e310fd43 MB |
4053 | if (size > high) |
4054 | sum += size - high; | |
1da177e4 LT |
4055 | } |
4056 | ||
4057 | return sum; | |
4058 | } | |
4059 | ||
e0fb5815 ZY |
4060 | /** |
4061 | * nr_free_buffer_pages - count number of pages beyond high watermark | |
4062 | * | |
4063 | * nr_free_buffer_pages() counts the number of pages which are beyond the high | |
4064 | * watermark within ZONE_DMA and ZONE_NORMAL. | |
1da177e4 | 4065 | */ |
ebec3862 | 4066 | unsigned long nr_free_buffer_pages(void) |
1da177e4 | 4067 | { |
af4ca457 | 4068 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 4069 | } |
c2f1a551 | 4070 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 | 4071 | |
e0fb5815 ZY |
4072 | /** |
4073 | * nr_free_pagecache_pages - count number of pages beyond high watermark | |
4074 | * | |
4075 | * nr_free_pagecache_pages() counts the number of pages which are beyond the | |
4076 | * high watermark within all zones. | |
1da177e4 | 4077 | */ |
ebec3862 | 4078 | unsigned long nr_free_pagecache_pages(void) |
1da177e4 | 4079 | { |
2a1e274a | 4080 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
1da177e4 | 4081 | } |
08e0f6a9 CL |
4082 | |
4083 | static inline void show_node(struct zone *zone) | |
1da177e4 | 4084 | { |
e5adfffc | 4085 | if (IS_ENABLED(CONFIG_NUMA)) |
25ba77c1 | 4086 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 4087 | } |
1da177e4 | 4088 | |
d02bd27b IR |
4089 | long si_mem_available(void) |
4090 | { | |
4091 | long available; | |
4092 | unsigned long pagecache; | |
4093 | unsigned long wmark_low = 0; | |
4094 | unsigned long pages[NR_LRU_LISTS]; | |
4095 | struct zone *zone; | |
4096 | int lru; | |
4097 | ||
4098 | for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) | |
4099 | pages[lru] = global_page_state(NR_LRU_BASE + lru); | |
4100 | ||
4101 | for_each_zone(zone) | |
4102 | wmark_low += zone->watermark[WMARK_LOW]; | |
4103 | ||
4104 | /* | |
4105 | * Estimate the amount of memory available for userspace allocations, | |
4106 | * without causing swapping. | |
4107 | */ | |
4108 | available = global_page_state(NR_FREE_PAGES) - totalreserve_pages; | |
4109 | ||
4110 | /* | |
4111 | * Not all the page cache can be freed, otherwise the system will | |
4112 | * start swapping. Assume at least half of the page cache, or the | |
4113 | * low watermark worth of cache, needs to stay. | |
4114 | */ | |
4115 | pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; | |
4116 | pagecache -= min(pagecache / 2, wmark_low); | |
4117 | available += pagecache; | |
4118 | ||
4119 | /* | |
4120 | * Part of the reclaimable slab consists of items that are in use, | |
4121 | * and cannot be freed. Cap this estimate at the low watermark. | |
4122 | */ | |
4123 | available += global_page_state(NR_SLAB_RECLAIMABLE) - | |
4124 | min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low); | |
4125 | ||
4126 | if (available < 0) | |
4127 | available = 0; | |
4128 | return available; | |
4129 | } | |
4130 | EXPORT_SYMBOL_GPL(si_mem_available); | |
4131 | ||
1da177e4 LT |
4132 | void si_meminfo(struct sysinfo *val) |
4133 | { | |
4134 | val->totalram = totalram_pages; | |
11fb9989 | 4135 | val->sharedram = global_node_page_state(NR_SHMEM); |
d23ad423 | 4136 | val->freeram = global_page_state(NR_FREE_PAGES); |
1da177e4 | 4137 | val->bufferram = nr_blockdev_pages(); |
1da177e4 LT |
4138 | val->totalhigh = totalhigh_pages; |
4139 | val->freehigh = nr_free_highpages(); | |
1da177e4 LT |
4140 | val->mem_unit = PAGE_SIZE; |
4141 | } | |
4142 | ||
4143 | EXPORT_SYMBOL(si_meminfo); | |
4144 | ||
4145 | #ifdef CONFIG_NUMA | |
4146 | void si_meminfo_node(struct sysinfo *val, int nid) | |
4147 | { | |
cdd91a77 JL |
4148 | int zone_type; /* needs to be signed */ |
4149 | unsigned long managed_pages = 0; | |
fc2bd799 JK |
4150 | unsigned long managed_highpages = 0; |
4151 | unsigned long free_highpages = 0; | |
1da177e4 LT |
4152 | pg_data_t *pgdat = NODE_DATA(nid); |
4153 | ||
cdd91a77 JL |
4154 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) |
4155 | managed_pages += pgdat->node_zones[zone_type].managed_pages; | |
4156 | val->totalram = managed_pages; | |
11fb9989 | 4157 | val->sharedram = node_page_state(pgdat, NR_SHMEM); |
75ef7184 | 4158 | val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 4159 | #ifdef CONFIG_HIGHMEM |
fc2bd799 JK |
4160 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { |
4161 | struct zone *zone = &pgdat->node_zones[zone_type]; | |
4162 | ||
4163 | if (is_highmem(zone)) { | |
4164 | managed_highpages += zone->managed_pages; | |
4165 | free_highpages += zone_page_state(zone, NR_FREE_PAGES); | |
4166 | } | |
4167 | } | |
4168 | val->totalhigh = managed_highpages; | |
4169 | val->freehigh = free_highpages; | |
98d2b0eb | 4170 | #else |
fc2bd799 JK |
4171 | val->totalhigh = managed_highpages; |
4172 | val->freehigh = free_highpages; | |
98d2b0eb | 4173 | #endif |
1da177e4 LT |
4174 | val->mem_unit = PAGE_SIZE; |
4175 | } | |
4176 | #endif | |
4177 | ||
ddd588b5 | 4178 | /* |
7bf02ea2 DR |
4179 | * Determine whether the node should be displayed or not, depending on whether |
4180 | * SHOW_MEM_FILTER_NODES was passed to show_free_areas(). | |
ddd588b5 | 4181 | */ |
7bf02ea2 | 4182 | bool skip_free_areas_node(unsigned int flags, int nid) |
ddd588b5 DR |
4183 | { |
4184 | bool ret = false; | |
cc9a6c87 | 4185 | unsigned int cpuset_mems_cookie; |
ddd588b5 DR |
4186 | |
4187 | if (!(flags & SHOW_MEM_FILTER_NODES)) | |
4188 | goto out; | |
4189 | ||
cc9a6c87 | 4190 | do { |
d26914d1 | 4191 | cpuset_mems_cookie = read_mems_allowed_begin(); |
cc9a6c87 | 4192 | ret = !node_isset(nid, cpuset_current_mems_allowed); |
d26914d1 | 4193 | } while (read_mems_allowed_retry(cpuset_mems_cookie)); |
ddd588b5 DR |
4194 | out: |
4195 | return ret; | |
4196 | } | |
4197 | ||
1da177e4 LT |
4198 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
4199 | ||
377e4f16 RV |
4200 | static void show_migration_types(unsigned char type) |
4201 | { | |
4202 | static const char types[MIGRATE_TYPES] = { | |
4203 | [MIGRATE_UNMOVABLE] = 'U', | |
377e4f16 | 4204 | [MIGRATE_MOVABLE] = 'M', |
475a2f90 VB |
4205 | [MIGRATE_RECLAIMABLE] = 'E', |
4206 | [MIGRATE_HIGHATOMIC] = 'H', | |
377e4f16 RV |
4207 | #ifdef CONFIG_CMA |
4208 | [MIGRATE_CMA] = 'C', | |
4209 | #endif | |
194159fb | 4210 | #ifdef CONFIG_MEMORY_ISOLATION |
377e4f16 | 4211 | [MIGRATE_ISOLATE] = 'I', |
194159fb | 4212 | #endif |
377e4f16 RV |
4213 | }; |
4214 | char tmp[MIGRATE_TYPES + 1]; | |
4215 | char *p = tmp; | |
4216 | int i; | |
4217 | ||
4218 | for (i = 0; i < MIGRATE_TYPES; i++) { | |
4219 | if (type & (1 << i)) | |
4220 | *p++ = types[i]; | |
4221 | } | |
4222 | ||
4223 | *p = '\0'; | |
4224 | printk("(%s) ", tmp); | |
4225 | } | |
4226 | ||
1da177e4 LT |
4227 | /* |
4228 | * Show free area list (used inside shift_scroll-lock stuff) | |
4229 | * We also calculate the percentage fragmentation. We do this by counting the | |
4230 | * memory on each free list with the exception of the first item on the list. | |
d1bfcdb8 KK |
4231 | * |
4232 | * Bits in @filter: | |
4233 | * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's | |
4234 | * cpuset. | |
1da177e4 | 4235 | */ |
7bf02ea2 | 4236 | void show_free_areas(unsigned int filter) |
1da177e4 | 4237 | { |
d1bfcdb8 | 4238 | unsigned long free_pcp = 0; |
c7241913 | 4239 | int cpu; |
1da177e4 | 4240 | struct zone *zone; |
599d0c95 | 4241 | pg_data_t *pgdat; |
1da177e4 | 4242 | |
ee99c71c | 4243 | for_each_populated_zone(zone) { |
7bf02ea2 | 4244 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 4245 | continue; |
d1bfcdb8 | 4246 | |
761b0677 KK |
4247 | for_each_online_cpu(cpu) |
4248 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
1da177e4 LT |
4249 | } |
4250 | ||
a731286d KM |
4251 | printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" |
4252 | " active_file:%lu inactive_file:%lu isolated_file:%lu\n" | |
d1bfcdb8 KK |
4253 | " unevictable:%lu dirty:%lu writeback:%lu unstable:%lu\n" |
4254 | " slab_reclaimable:%lu slab_unreclaimable:%lu\n" | |
d1ce749a | 4255 | " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n" |
d1bfcdb8 | 4256 | " free:%lu free_pcp:%lu free_cma:%lu\n", |
599d0c95 MG |
4257 | global_node_page_state(NR_ACTIVE_ANON), |
4258 | global_node_page_state(NR_INACTIVE_ANON), | |
4259 | global_node_page_state(NR_ISOLATED_ANON), | |
4260 | global_node_page_state(NR_ACTIVE_FILE), | |
4261 | global_node_page_state(NR_INACTIVE_FILE), | |
4262 | global_node_page_state(NR_ISOLATED_FILE), | |
4263 | global_node_page_state(NR_UNEVICTABLE), | |
11fb9989 MG |
4264 | global_node_page_state(NR_FILE_DIRTY), |
4265 | global_node_page_state(NR_WRITEBACK), | |
4266 | global_node_page_state(NR_UNSTABLE_NFS), | |
3701b033 KM |
4267 | global_page_state(NR_SLAB_RECLAIMABLE), |
4268 | global_page_state(NR_SLAB_UNRECLAIMABLE), | |
50658e2e | 4269 | global_node_page_state(NR_FILE_MAPPED), |
11fb9989 | 4270 | global_node_page_state(NR_SHMEM), |
a25700a5 | 4271 | global_page_state(NR_PAGETABLE), |
d1ce749a | 4272 | global_page_state(NR_BOUNCE), |
d1bfcdb8 KK |
4273 | global_page_state(NR_FREE_PAGES), |
4274 | free_pcp, | |
d1ce749a | 4275 | global_page_state(NR_FREE_CMA_PAGES)); |
1da177e4 | 4276 | |
599d0c95 MG |
4277 | for_each_online_pgdat(pgdat) { |
4278 | printk("Node %d" | |
4279 | " active_anon:%lukB" | |
4280 | " inactive_anon:%lukB" | |
4281 | " active_file:%lukB" | |
4282 | " inactive_file:%lukB" | |
4283 | " unevictable:%lukB" | |
4284 | " isolated(anon):%lukB" | |
4285 | " isolated(file):%lukB" | |
50658e2e | 4286 | " mapped:%lukB" |
11fb9989 MG |
4287 | " dirty:%lukB" |
4288 | " writeback:%lukB" | |
4289 | " shmem:%lukB" | |
4290 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
4291 | " shmem_thp: %lukB" | |
4292 | " shmem_pmdmapped: %lukB" | |
4293 | " anon_thp: %lukB" | |
4294 | #endif | |
4295 | " writeback_tmp:%lukB" | |
4296 | " unstable:%lukB" | |
33e077bd | 4297 | " pages_scanned:%lu" |
599d0c95 MG |
4298 | " all_unreclaimable? %s" |
4299 | "\n", | |
4300 | pgdat->node_id, | |
4301 | K(node_page_state(pgdat, NR_ACTIVE_ANON)), | |
4302 | K(node_page_state(pgdat, NR_INACTIVE_ANON)), | |
4303 | K(node_page_state(pgdat, NR_ACTIVE_FILE)), | |
4304 | K(node_page_state(pgdat, NR_INACTIVE_FILE)), | |
4305 | K(node_page_state(pgdat, NR_UNEVICTABLE)), | |
4306 | K(node_page_state(pgdat, NR_ISOLATED_ANON)), | |
4307 | K(node_page_state(pgdat, NR_ISOLATED_FILE)), | |
50658e2e | 4308 | K(node_page_state(pgdat, NR_FILE_MAPPED)), |
11fb9989 MG |
4309 | K(node_page_state(pgdat, NR_FILE_DIRTY)), |
4310 | K(node_page_state(pgdat, NR_WRITEBACK)), | |
4311 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
4312 | K(node_page_state(pgdat, NR_SHMEM_THPS) * HPAGE_PMD_NR), | |
4313 | K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) | |
4314 | * HPAGE_PMD_NR), | |
4315 | K(node_page_state(pgdat, NR_ANON_THPS) * HPAGE_PMD_NR), | |
4316 | #endif | |
4317 | K(node_page_state(pgdat, NR_SHMEM)), | |
4318 | K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), | |
4319 | K(node_page_state(pgdat, NR_UNSTABLE_NFS)), | |
33e077bd | 4320 | node_page_state(pgdat, NR_PAGES_SCANNED), |
599d0c95 MG |
4321 | !pgdat_reclaimable(pgdat) ? "yes" : "no"); |
4322 | } | |
4323 | ||
ee99c71c | 4324 | for_each_populated_zone(zone) { |
1da177e4 LT |
4325 | int i; |
4326 | ||
7bf02ea2 | 4327 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 4328 | continue; |
d1bfcdb8 KK |
4329 | |
4330 | free_pcp = 0; | |
4331 | for_each_online_cpu(cpu) | |
4332 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
4333 | ||
1da177e4 LT |
4334 | show_node(zone); |
4335 | printk("%s" | |
4336 | " free:%lukB" | |
4337 | " min:%lukB" | |
4338 | " low:%lukB" | |
4339 | " high:%lukB" | |
71c799f4 MK |
4340 | " active_anon:%lukB" |
4341 | " inactive_anon:%lukB" | |
4342 | " active_file:%lukB" | |
4343 | " inactive_file:%lukB" | |
4344 | " unevictable:%lukB" | |
5a1c84b4 | 4345 | " writepending:%lukB" |
1da177e4 | 4346 | " present:%lukB" |
9feedc9d | 4347 | " managed:%lukB" |
4a0aa73f | 4348 | " mlocked:%lukB" |
4a0aa73f KM |
4349 | " slab_reclaimable:%lukB" |
4350 | " slab_unreclaimable:%lukB" | |
c6a7f572 | 4351 | " kernel_stack:%lukB" |
4a0aa73f | 4352 | " pagetables:%lukB" |
4a0aa73f | 4353 | " bounce:%lukB" |
d1bfcdb8 KK |
4354 | " free_pcp:%lukB" |
4355 | " local_pcp:%ukB" | |
d1ce749a | 4356 | " free_cma:%lukB" |
1da177e4 LT |
4357 | "\n", |
4358 | zone->name, | |
88f5acf8 | 4359 | K(zone_page_state(zone, NR_FREE_PAGES)), |
41858966 MG |
4360 | K(min_wmark_pages(zone)), |
4361 | K(low_wmark_pages(zone)), | |
4362 | K(high_wmark_pages(zone)), | |
71c799f4 MK |
4363 | K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON)), |
4364 | K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON)), | |
4365 | K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE)), | |
4366 | K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)), | |
4367 | K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)), | |
5a1c84b4 | 4368 | K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)), |
1da177e4 | 4369 | K(zone->present_pages), |
9feedc9d | 4370 | K(zone->managed_pages), |
4a0aa73f | 4371 | K(zone_page_state(zone, NR_MLOCK)), |
4a0aa73f KM |
4372 | K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)), |
4373 | K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)), | |
d30dd8be | 4374 | zone_page_state(zone, NR_KERNEL_STACK_KB), |
4a0aa73f | 4375 | K(zone_page_state(zone, NR_PAGETABLE)), |
4a0aa73f | 4376 | K(zone_page_state(zone, NR_BOUNCE)), |
d1bfcdb8 KK |
4377 | K(free_pcp), |
4378 | K(this_cpu_read(zone->pageset->pcp.count)), | |
33e077bd | 4379 | K(zone_page_state(zone, NR_FREE_CMA_PAGES))); |
1da177e4 LT |
4380 | printk("lowmem_reserve[]:"); |
4381 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3484b2de | 4382 | printk(" %ld", zone->lowmem_reserve[i]); |
1da177e4 LT |
4383 | printk("\n"); |
4384 | } | |
4385 | ||
ee99c71c | 4386 | for_each_populated_zone(zone) { |
d00181b9 KS |
4387 | unsigned int order; |
4388 | unsigned long nr[MAX_ORDER], flags, total = 0; | |
377e4f16 | 4389 | unsigned char types[MAX_ORDER]; |
1da177e4 | 4390 | |
7bf02ea2 | 4391 | if (skip_free_areas_node(filter, zone_to_nid(zone))) |
ddd588b5 | 4392 | continue; |
1da177e4 LT |
4393 | show_node(zone); |
4394 | printk("%s: ", zone->name); | |
1da177e4 LT |
4395 | |
4396 | spin_lock_irqsave(&zone->lock, flags); | |
4397 | for (order = 0; order < MAX_ORDER; order++) { | |
377e4f16 RV |
4398 | struct free_area *area = &zone->free_area[order]; |
4399 | int type; | |
4400 | ||
4401 | nr[order] = area->nr_free; | |
8f9de51a | 4402 | total += nr[order] << order; |
377e4f16 RV |
4403 | |
4404 | types[order] = 0; | |
4405 | for (type = 0; type < MIGRATE_TYPES; type++) { | |
4406 | if (!list_empty(&area->free_list[type])) | |
4407 | types[order] |= 1 << type; | |
4408 | } | |
1da177e4 LT |
4409 | } |
4410 | spin_unlock_irqrestore(&zone->lock, flags); | |
377e4f16 | 4411 | for (order = 0; order < MAX_ORDER; order++) { |
8f9de51a | 4412 | printk("%lu*%lukB ", nr[order], K(1UL) << order); |
377e4f16 RV |
4413 | if (nr[order]) |
4414 | show_migration_types(types[order]); | |
4415 | } | |
1da177e4 LT |
4416 | printk("= %lukB\n", K(total)); |
4417 | } | |
4418 | ||
949f7ec5 DR |
4419 | hugetlb_show_meminfo(); |
4420 | ||
11fb9989 | 4421 | printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES)); |
e6f3602d | 4422 | |
1da177e4 LT |
4423 | show_swap_cache_info(); |
4424 | } | |
4425 | ||
19770b32 MG |
4426 | static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) |
4427 | { | |
4428 | zoneref->zone = zone; | |
4429 | zoneref->zone_idx = zone_idx(zone); | |
4430 | } | |
4431 | ||
1da177e4 LT |
4432 | /* |
4433 | * Builds allocation fallback zone lists. | |
1a93205b CL |
4434 | * |
4435 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 4436 | */ |
f0c0b2b8 | 4437 | static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, |
bc732f1d | 4438 | int nr_zones) |
1da177e4 | 4439 | { |
1a93205b | 4440 | struct zone *zone; |
bc732f1d | 4441 | enum zone_type zone_type = MAX_NR_ZONES; |
02a68a5e CL |
4442 | |
4443 | do { | |
2f6726e5 | 4444 | zone_type--; |
070f8032 | 4445 | zone = pgdat->node_zones + zone_type; |
1a93205b | 4446 | if (populated_zone(zone)) { |
dd1a239f MG |
4447 | zoneref_set_zone(zone, |
4448 | &zonelist->_zonerefs[nr_zones++]); | |
070f8032 | 4449 | check_highest_zone(zone_type); |
1da177e4 | 4450 | } |
2f6726e5 | 4451 | } while (zone_type); |
bc732f1d | 4452 | |
070f8032 | 4453 | return nr_zones; |
1da177e4 LT |
4454 | } |
4455 | ||
f0c0b2b8 KH |
4456 | |
4457 | /* | |
4458 | * zonelist_order: | |
4459 | * 0 = automatic detection of better ordering. | |
4460 | * 1 = order by ([node] distance, -zonetype) | |
4461 | * 2 = order by (-zonetype, [node] distance) | |
4462 | * | |
4463 | * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create | |
4464 | * the same zonelist. So only NUMA can configure this param. | |
4465 | */ | |
4466 | #define ZONELIST_ORDER_DEFAULT 0 | |
4467 | #define ZONELIST_ORDER_NODE 1 | |
4468 | #define ZONELIST_ORDER_ZONE 2 | |
4469 | ||
4470 | /* zonelist order in the kernel. | |
4471 | * set_zonelist_order() will set this to NODE or ZONE. | |
4472 | */ | |
4473 | static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
4474 | static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; | |
4475 | ||
4476 | ||
1da177e4 | 4477 | #ifdef CONFIG_NUMA |
f0c0b2b8 KH |
4478 | /* The value user specified ....changed by config */ |
4479 | static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
4480 | /* string for sysctl */ | |
4481 | #define NUMA_ZONELIST_ORDER_LEN 16 | |
4482 | char numa_zonelist_order[16] = "default"; | |
4483 | ||
4484 | /* | |
4485 | * interface for configure zonelist ordering. | |
4486 | * command line option "numa_zonelist_order" | |
4487 | * = "[dD]efault - default, automatic configuration. | |
4488 | * = "[nN]ode - order by node locality, then by zone within node | |
4489 | * = "[zZ]one - order by zone, then by locality within zone | |
4490 | */ | |
4491 | ||
4492 | static int __parse_numa_zonelist_order(char *s) | |
4493 | { | |
4494 | if (*s == 'd' || *s == 'D') { | |
4495 | user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
4496 | } else if (*s == 'n' || *s == 'N') { | |
4497 | user_zonelist_order = ZONELIST_ORDER_NODE; | |
4498 | } else if (*s == 'z' || *s == 'Z') { | |
4499 | user_zonelist_order = ZONELIST_ORDER_ZONE; | |
4500 | } else { | |
1170532b | 4501 | pr_warn("Ignoring invalid numa_zonelist_order value: %s\n", s); |
f0c0b2b8 KH |
4502 | return -EINVAL; |
4503 | } | |
4504 | return 0; | |
4505 | } | |
4506 | ||
4507 | static __init int setup_numa_zonelist_order(char *s) | |
4508 | { | |
ecb256f8 VL |
4509 | int ret; |
4510 | ||
4511 | if (!s) | |
4512 | return 0; | |
4513 | ||
4514 | ret = __parse_numa_zonelist_order(s); | |
4515 | if (ret == 0) | |
4516 | strlcpy(numa_zonelist_order, s, NUMA_ZONELIST_ORDER_LEN); | |
4517 | ||
4518 | return ret; | |
f0c0b2b8 KH |
4519 | } |
4520 | early_param("numa_zonelist_order", setup_numa_zonelist_order); | |
4521 | ||
4522 | /* | |
4523 | * sysctl handler for numa_zonelist_order | |
4524 | */ | |
cccad5b9 | 4525 | int numa_zonelist_order_handler(struct ctl_table *table, int write, |
8d65af78 | 4526 | void __user *buffer, size_t *length, |
f0c0b2b8 KH |
4527 | loff_t *ppos) |
4528 | { | |
4529 | char saved_string[NUMA_ZONELIST_ORDER_LEN]; | |
4530 | int ret; | |
443c6f14 | 4531 | static DEFINE_MUTEX(zl_order_mutex); |
f0c0b2b8 | 4532 | |
443c6f14 | 4533 | mutex_lock(&zl_order_mutex); |
dacbde09 CG |
4534 | if (write) { |
4535 | if (strlen((char *)table->data) >= NUMA_ZONELIST_ORDER_LEN) { | |
4536 | ret = -EINVAL; | |
4537 | goto out; | |
4538 | } | |
4539 | strcpy(saved_string, (char *)table->data); | |
4540 | } | |
8d65af78 | 4541 | ret = proc_dostring(table, write, buffer, length, ppos); |
f0c0b2b8 | 4542 | if (ret) |
443c6f14 | 4543 | goto out; |
f0c0b2b8 KH |
4544 | if (write) { |
4545 | int oldval = user_zonelist_order; | |
dacbde09 CG |
4546 | |
4547 | ret = __parse_numa_zonelist_order((char *)table->data); | |
4548 | if (ret) { | |
f0c0b2b8 KH |
4549 | /* |
4550 | * bogus value. restore saved string | |
4551 | */ | |
dacbde09 | 4552 | strncpy((char *)table->data, saved_string, |
f0c0b2b8 KH |
4553 | NUMA_ZONELIST_ORDER_LEN); |
4554 | user_zonelist_order = oldval; | |
4eaf3f64 HL |
4555 | } else if (oldval != user_zonelist_order) { |
4556 | mutex_lock(&zonelists_mutex); | |
9adb62a5 | 4557 | build_all_zonelists(NULL, NULL); |
4eaf3f64 HL |
4558 | mutex_unlock(&zonelists_mutex); |
4559 | } | |
f0c0b2b8 | 4560 | } |
443c6f14 AK |
4561 | out: |
4562 | mutex_unlock(&zl_order_mutex); | |
4563 | return ret; | |
f0c0b2b8 KH |
4564 | } |
4565 | ||
4566 | ||
62bc62a8 | 4567 | #define MAX_NODE_LOAD (nr_online_nodes) |
f0c0b2b8 KH |
4568 | static int node_load[MAX_NUMNODES]; |
4569 | ||
1da177e4 | 4570 | /** |
4dc3b16b | 4571 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
4572 | * @node: node whose fallback list we're appending |
4573 | * @used_node_mask: nodemask_t of already used nodes | |
4574 | * | |
4575 | * We use a number of factors to determine which is the next node that should | |
4576 | * appear on a given node's fallback list. The node should not have appeared | |
4577 | * already in @node's fallback list, and it should be the next closest node | |
4578 | * according to the distance array (which contains arbitrary distance values | |
4579 | * from each node to each node in the system), and should also prefer nodes | |
4580 | * with no CPUs, since presumably they'll have very little allocation pressure | |
4581 | * on them otherwise. | |
4582 | * It returns -1 if no node is found. | |
4583 | */ | |
f0c0b2b8 | 4584 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 4585 | { |
4cf808eb | 4586 | int n, val; |
1da177e4 | 4587 | int min_val = INT_MAX; |
00ef2d2f | 4588 | int best_node = NUMA_NO_NODE; |
a70f7302 | 4589 | const struct cpumask *tmp = cpumask_of_node(0); |
1da177e4 | 4590 | |
4cf808eb LT |
4591 | /* Use the local node if we haven't already */ |
4592 | if (!node_isset(node, *used_node_mask)) { | |
4593 | node_set(node, *used_node_mask); | |
4594 | return node; | |
4595 | } | |
1da177e4 | 4596 | |
4b0ef1fe | 4597 | for_each_node_state(n, N_MEMORY) { |
1da177e4 LT |
4598 | |
4599 | /* Don't want a node to appear more than once */ | |
4600 | if (node_isset(n, *used_node_mask)) | |
4601 | continue; | |
4602 | ||
1da177e4 LT |
4603 | /* Use the distance array to find the distance */ |
4604 | val = node_distance(node, n); | |
4605 | ||
4cf808eb LT |
4606 | /* Penalize nodes under us ("prefer the next node") */ |
4607 | val += (n < node); | |
4608 | ||
1da177e4 | 4609 | /* Give preference to headless and unused nodes */ |
a70f7302 RR |
4610 | tmp = cpumask_of_node(n); |
4611 | if (!cpumask_empty(tmp)) | |
1da177e4 LT |
4612 | val += PENALTY_FOR_NODE_WITH_CPUS; |
4613 | ||
4614 | /* Slight preference for less loaded node */ | |
4615 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
4616 | val += node_load[n]; | |
4617 | ||
4618 | if (val < min_val) { | |
4619 | min_val = val; | |
4620 | best_node = n; | |
4621 | } | |
4622 | } | |
4623 | ||
4624 | if (best_node >= 0) | |
4625 | node_set(best_node, *used_node_mask); | |
4626 | ||
4627 | return best_node; | |
4628 | } | |
4629 | ||
f0c0b2b8 KH |
4630 | |
4631 | /* | |
4632 | * Build zonelists ordered by node and zones within node. | |
4633 | * This results in maximum locality--normal zone overflows into local | |
4634 | * DMA zone, if any--but risks exhausting DMA zone. | |
4635 | */ | |
4636 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) | |
1da177e4 | 4637 | { |
f0c0b2b8 | 4638 | int j; |
1da177e4 | 4639 | struct zonelist *zonelist; |
f0c0b2b8 | 4640 | |
54a6eb5c | 4641 | zonelist = &pgdat->node_zonelists[0]; |
dd1a239f | 4642 | for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++) |
54a6eb5c | 4643 | ; |
bc732f1d | 4644 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
dd1a239f MG |
4645 | zonelist->_zonerefs[j].zone = NULL; |
4646 | zonelist->_zonerefs[j].zone_idx = 0; | |
f0c0b2b8 KH |
4647 | } |
4648 | ||
523b9458 CL |
4649 | /* |
4650 | * Build gfp_thisnode zonelists | |
4651 | */ | |
4652 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
4653 | { | |
523b9458 CL |
4654 | int j; |
4655 | struct zonelist *zonelist; | |
4656 | ||
54a6eb5c | 4657 | zonelist = &pgdat->node_zonelists[1]; |
bc732f1d | 4658 | j = build_zonelists_node(pgdat, zonelist, 0); |
dd1a239f MG |
4659 | zonelist->_zonerefs[j].zone = NULL; |
4660 | zonelist->_zonerefs[j].zone_idx = 0; | |
523b9458 CL |
4661 | } |
4662 | ||
f0c0b2b8 KH |
4663 | /* |
4664 | * Build zonelists ordered by zone and nodes within zones. | |
4665 | * This results in conserving DMA zone[s] until all Normal memory is | |
4666 | * exhausted, but results in overflowing to remote node while memory | |
4667 | * may still exist in local DMA zone. | |
4668 | */ | |
4669 | static int node_order[MAX_NUMNODES]; | |
4670 | ||
4671 | static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) | |
4672 | { | |
f0c0b2b8 KH |
4673 | int pos, j, node; |
4674 | int zone_type; /* needs to be signed */ | |
4675 | struct zone *z; | |
4676 | struct zonelist *zonelist; | |
4677 | ||
54a6eb5c MG |
4678 | zonelist = &pgdat->node_zonelists[0]; |
4679 | pos = 0; | |
4680 | for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) { | |
4681 | for (j = 0; j < nr_nodes; j++) { | |
4682 | node = node_order[j]; | |
4683 | z = &NODE_DATA(node)->node_zones[zone_type]; | |
4684 | if (populated_zone(z)) { | |
dd1a239f MG |
4685 | zoneref_set_zone(z, |
4686 | &zonelist->_zonerefs[pos++]); | |
54a6eb5c | 4687 | check_highest_zone(zone_type); |
f0c0b2b8 KH |
4688 | } |
4689 | } | |
f0c0b2b8 | 4690 | } |
dd1a239f MG |
4691 | zonelist->_zonerefs[pos].zone = NULL; |
4692 | zonelist->_zonerefs[pos].zone_idx = 0; | |
f0c0b2b8 KH |
4693 | } |
4694 | ||
3193913c MG |
4695 | #if defined(CONFIG_64BIT) |
4696 | /* | |
4697 | * Devices that require DMA32/DMA are relatively rare and do not justify a | |
4698 | * penalty to every machine in case the specialised case applies. Default | |
4699 | * to Node-ordering on 64-bit NUMA machines | |
4700 | */ | |
4701 | static int default_zonelist_order(void) | |
4702 | { | |
4703 | return ZONELIST_ORDER_NODE; | |
4704 | } | |
4705 | #else | |
4706 | /* | |
4707 | * On 32-bit, the Normal zone needs to be preserved for allocations accessible | |
4708 | * by the kernel. If processes running on node 0 deplete the low memory zone | |
4709 | * then reclaim will occur more frequency increasing stalls and potentially | |
4710 | * be easier to OOM if a large percentage of the zone is under writeback or | |
4711 | * dirty. The problem is significantly worse if CONFIG_HIGHPTE is not set. | |
4712 | * Hence, default to zone ordering on 32-bit. | |
4713 | */ | |
f0c0b2b8 KH |
4714 | static int default_zonelist_order(void) |
4715 | { | |
f0c0b2b8 KH |
4716 | return ZONELIST_ORDER_ZONE; |
4717 | } | |
3193913c | 4718 | #endif /* CONFIG_64BIT */ |
f0c0b2b8 KH |
4719 | |
4720 | static void set_zonelist_order(void) | |
4721 | { | |
4722 | if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) | |
4723 | current_zonelist_order = default_zonelist_order(); | |
4724 | else | |
4725 | current_zonelist_order = user_zonelist_order; | |
4726 | } | |
4727 | ||
4728 | static void build_zonelists(pg_data_t *pgdat) | |
4729 | { | |
c00eb15a | 4730 | int i, node, load; |
1da177e4 | 4731 | nodemask_t used_mask; |
f0c0b2b8 KH |
4732 | int local_node, prev_node; |
4733 | struct zonelist *zonelist; | |
d00181b9 | 4734 | unsigned int order = current_zonelist_order; |
1da177e4 LT |
4735 | |
4736 | /* initialize zonelists */ | |
523b9458 | 4737 | for (i = 0; i < MAX_ZONELISTS; i++) { |
1da177e4 | 4738 | zonelist = pgdat->node_zonelists + i; |
dd1a239f MG |
4739 | zonelist->_zonerefs[0].zone = NULL; |
4740 | zonelist->_zonerefs[0].zone_idx = 0; | |
1da177e4 LT |
4741 | } |
4742 | ||
4743 | /* NUMA-aware ordering of nodes */ | |
4744 | local_node = pgdat->node_id; | |
62bc62a8 | 4745 | load = nr_online_nodes; |
1da177e4 LT |
4746 | prev_node = local_node; |
4747 | nodes_clear(used_mask); | |
f0c0b2b8 | 4748 | |
f0c0b2b8 | 4749 | memset(node_order, 0, sizeof(node_order)); |
c00eb15a | 4750 | i = 0; |
f0c0b2b8 | 4751 | |
1da177e4 LT |
4752 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
4753 | /* | |
4754 | * We don't want to pressure a particular node. | |
4755 | * So adding penalty to the first node in same | |
4756 | * distance group to make it round-robin. | |
4757 | */ | |
957f822a DR |
4758 | if (node_distance(local_node, node) != |
4759 | node_distance(local_node, prev_node)) | |
f0c0b2b8 KH |
4760 | node_load[node] = load; |
4761 | ||
1da177e4 LT |
4762 | prev_node = node; |
4763 | load--; | |
f0c0b2b8 KH |
4764 | if (order == ZONELIST_ORDER_NODE) |
4765 | build_zonelists_in_node_order(pgdat, node); | |
4766 | else | |
c00eb15a | 4767 | node_order[i++] = node; /* remember order */ |
f0c0b2b8 | 4768 | } |
1da177e4 | 4769 | |
f0c0b2b8 KH |
4770 | if (order == ZONELIST_ORDER_ZONE) { |
4771 | /* calculate node order -- i.e., DMA last! */ | |
c00eb15a | 4772 | build_zonelists_in_zone_order(pgdat, i); |
1da177e4 | 4773 | } |
523b9458 CL |
4774 | |
4775 | build_thisnode_zonelists(pgdat); | |
1da177e4 LT |
4776 | } |
4777 | ||
7aac7898 LS |
4778 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
4779 | /* | |
4780 | * Return node id of node used for "local" allocations. | |
4781 | * I.e., first node id of first zone in arg node's generic zonelist. | |
4782 | * Used for initializing percpu 'numa_mem', which is used primarily | |
4783 | * for kernel allocations, so use GFP_KERNEL flags to locate zonelist. | |
4784 | */ | |
4785 | int local_memory_node(int node) | |
4786 | { | |
c33d6c06 | 4787 | struct zoneref *z; |
7aac7898 | 4788 | |
c33d6c06 | 4789 | z = first_zones_zonelist(node_zonelist(node, GFP_KERNEL), |
7aac7898 | 4790 | gfp_zone(GFP_KERNEL), |
c33d6c06 MG |
4791 | NULL); |
4792 | return z->zone->node; | |
7aac7898 LS |
4793 | } |
4794 | #endif | |
f0c0b2b8 | 4795 | |
1da177e4 LT |
4796 | #else /* CONFIG_NUMA */ |
4797 | ||
f0c0b2b8 KH |
4798 | static void set_zonelist_order(void) |
4799 | { | |
4800 | current_zonelist_order = ZONELIST_ORDER_ZONE; | |
4801 | } | |
4802 | ||
4803 | static void build_zonelists(pg_data_t *pgdat) | |
1da177e4 | 4804 | { |
19655d34 | 4805 | int node, local_node; |
54a6eb5c MG |
4806 | enum zone_type j; |
4807 | struct zonelist *zonelist; | |
1da177e4 LT |
4808 | |
4809 | local_node = pgdat->node_id; | |
1da177e4 | 4810 | |
54a6eb5c | 4811 | zonelist = &pgdat->node_zonelists[0]; |
bc732f1d | 4812 | j = build_zonelists_node(pgdat, zonelist, 0); |
1da177e4 | 4813 | |
54a6eb5c MG |
4814 | /* |
4815 | * Now we build the zonelist so that it contains the zones | |
4816 | * of all the other nodes. | |
4817 | * We don't want to pressure a particular node, so when | |
4818 | * building the zones for node N, we make sure that the | |
4819 | * zones coming right after the local ones are those from | |
4820 | * node N+1 (modulo N) | |
4821 | */ | |
4822 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
4823 | if (!node_online(node)) | |
4824 | continue; | |
bc732f1d | 4825 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
1da177e4 | 4826 | } |
54a6eb5c MG |
4827 | for (node = 0; node < local_node; node++) { |
4828 | if (!node_online(node)) | |
4829 | continue; | |
bc732f1d | 4830 | j = build_zonelists_node(NODE_DATA(node), zonelist, j); |
54a6eb5c MG |
4831 | } |
4832 | ||
dd1a239f MG |
4833 | zonelist->_zonerefs[j].zone = NULL; |
4834 | zonelist->_zonerefs[j].zone_idx = 0; | |
1da177e4 LT |
4835 | } |
4836 | ||
4837 | #endif /* CONFIG_NUMA */ | |
4838 | ||
99dcc3e5 CL |
4839 | /* |
4840 | * Boot pageset table. One per cpu which is going to be used for all | |
4841 | * zones and all nodes. The parameters will be set in such a way | |
4842 | * that an item put on a list will immediately be handed over to | |
4843 | * the buddy list. This is safe since pageset manipulation is done | |
4844 | * with interrupts disabled. | |
4845 | * | |
4846 | * The boot_pagesets must be kept even after bootup is complete for | |
4847 | * unused processors and/or zones. They do play a role for bootstrapping | |
4848 | * hotplugged processors. | |
4849 | * | |
4850 | * zoneinfo_show() and maybe other functions do | |
4851 | * not check if the processor is online before following the pageset pointer. | |
4852 | * Other parts of the kernel may not check if the zone is available. | |
4853 | */ | |
4854 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); | |
4855 | static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); | |
1f522509 | 4856 | static void setup_zone_pageset(struct zone *zone); |
99dcc3e5 | 4857 | |
4eaf3f64 HL |
4858 | /* |
4859 | * Global mutex to protect against size modification of zonelists | |
4860 | * as well as to serialize pageset setup for the new populated zone. | |
4861 | */ | |
4862 | DEFINE_MUTEX(zonelists_mutex); | |
4863 | ||
9b1a4d38 | 4864 | /* return values int ....just for stop_machine() */ |
4ed7e022 | 4865 | static int __build_all_zonelists(void *data) |
1da177e4 | 4866 | { |
6811378e | 4867 | int nid; |
99dcc3e5 | 4868 | int cpu; |
9adb62a5 | 4869 | pg_data_t *self = data; |
9276b1bc | 4870 | |
7f9cfb31 BL |
4871 | #ifdef CONFIG_NUMA |
4872 | memset(node_load, 0, sizeof(node_load)); | |
4873 | #endif | |
9adb62a5 JL |
4874 | |
4875 | if (self && !node_online(self->node_id)) { | |
4876 | build_zonelists(self); | |
9adb62a5 JL |
4877 | } |
4878 | ||
9276b1bc | 4879 | for_each_online_node(nid) { |
7ea1530a CL |
4880 | pg_data_t *pgdat = NODE_DATA(nid); |
4881 | ||
4882 | build_zonelists(pgdat); | |
9276b1bc | 4883 | } |
99dcc3e5 CL |
4884 | |
4885 | /* | |
4886 | * Initialize the boot_pagesets that are going to be used | |
4887 | * for bootstrapping processors. The real pagesets for | |
4888 | * each zone will be allocated later when the per cpu | |
4889 | * allocator is available. | |
4890 | * | |
4891 | * boot_pagesets are used also for bootstrapping offline | |
4892 | * cpus if the system is already booted because the pagesets | |
4893 | * are needed to initialize allocators on a specific cpu too. | |
4894 | * F.e. the percpu allocator needs the page allocator which | |
4895 | * needs the percpu allocator in order to allocate its pagesets | |
4896 | * (a chicken-egg dilemma). | |
4897 | */ | |
7aac7898 | 4898 | for_each_possible_cpu(cpu) { |
99dcc3e5 CL |
4899 | setup_pageset(&per_cpu(boot_pageset, cpu), 0); |
4900 | ||
7aac7898 LS |
4901 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
4902 | /* | |
4903 | * We now know the "local memory node" for each node-- | |
4904 | * i.e., the node of the first zone in the generic zonelist. | |
4905 | * Set up numa_mem percpu variable for on-line cpus. During | |
4906 | * boot, only the boot cpu should be on-line; we'll init the | |
4907 | * secondary cpus' numa_mem as they come on-line. During | |
4908 | * node/memory hotplug, we'll fixup all on-line cpus. | |
4909 | */ | |
4910 | if (cpu_online(cpu)) | |
4911 | set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); | |
4912 | #endif | |
4913 | } | |
4914 | ||
6811378e YG |
4915 | return 0; |
4916 | } | |
4917 | ||
061f67bc RV |
4918 | static noinline void __init |
4919 | build_all_zonelists_init(void) | |
4920 | { | |
4921 | __build_all_zonelists(NULL); | |
4922 | mminit_verify_zonelist(); | |
4923 | cpuset_init_current_mems_allowed(); | |
4924 | } | |
4925 | ||
4eaf3f64 HL |
4926 | /* |
4927 | * Called with zonelists_mutex held always | |
4928 | * unless system_state == SYSTEM_BOOTING. | |
061f67bc RV |
4929 | * |
4930 | * __ref due to (1) call of __meminit annotated setup_zone_pageset | |
4931 | * [we're only called with non-NULL zone through __meminit paths] and | |
4932 | * (2) call of __init annotated helper build_all_zonelists_init | |
4933 | * [protected by SYSTEM_BOOTING]. | |
4eaf3f64 | 4934 | */ |
9adb62a5 | 4935 | void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) |
6811378e | 4936 | { |
f0c0b2b8 KH |
4937 | set_zonelist_order(); |
4938 | ||
6811378e | 4939 | if (system_state == SYSTEM_BOOTING) { |
061f67bc | 4940 | build_all_zonelists_init(); |
6811378e | 4941 | } else { |
e9959f0f | 4942 | #ifdef CONFIG_MEMORY_HOTPLUG |
9adb62a5 JL |
4943 | if (zone) |
4944 | setup_zone_pageset(zone); | |
e9959f0f | 4945 | #endif |
dd1895e2 CS |
4946 | /* we have to stop all cpus to guarantee there is no user |
4947 | of zonelist */ | |
9adb62a5 | 4948 | stop_machine(__build_all_zonelists, pgdat, NULL); |
6811378e YG |
4949 | /* cpuset refresh routine should be here */ |
4950 | } | |
bd1e22b8 | 4951 | vm_total_pages = nr_free_pagecache_pages(); |
9ef9acb0 MG |
4952 | /* |
4953 | * Disable grouping by mobility if the number of pages in the | |
4954 | * system is too low to allow the mechanism to work. It would be | |
4955 | * more accurate, but expensive to check per-zone. This check is | |
4956 | * made on memory-hotadd so a system can start with mobility | |
4957 | * disabled and enable it later | |
4958 | */ | |
d9c23400 | 4959 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
4960 | page_group_by_mobility_disabled = 1; |
4961 | else | |
4962 | page_group_by_mobility_disabled = 0; | |
4963 | ||
756a025f JP |
4964 | pr_info("Built %i zonelists in %s order, mobility grouping %s. Total pages: %ld\n", |
4965 | nr_online_nodes, | |
4966 | zonelist_order_name[current_zonelist_order], | |
4967 | page_group_by_mobility_disabled ? "off" : "on", | |
4968 | vm_total_pages); | |
f0c0b2b8 | 4969 | #ifdef CONFIG_NUMA |
f88dfff5 | 4970 | pr_info("Policy zone: %s\n", zone_names[policy_zone]); |
f0c0b2b8 | 4971 | #endif |
1da177e4 LT |
4972 | } |
4973 | ||
4974 | /* | |
4975 | * Helper functions to size the waitqueue hash table. | |
4976 | * Essentially these want to choose hash table sizes sufficiently | |
4977 | * large so that collisions trying to wait on pages are rare. | |
4978 | * But in fact, the number of active page waitqueues on typical | |
4979 | * systems is ridiculously low, less than 200. So this is even | |
4980 | * conservative, even though it seems large. | |
4981 | * | |
4982 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to | |
4983 | * waitqueues, i.e. the size of the waitq table given the number of pages. | |
4984 | */ | |
4985 | #define PAGES_PER_WAITQUEUE 256 | |
4986 | ||
cca448fe | 4987 | #ifndef CONFIG_MEMORY_HOTPLUG |
02b694de | 4988 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
1da177e4 LT |
4989 | { |
4990 | unsigned long size = 1; | |
4991 | ||
4992 | pages /= PAGES_PER_WAITQUEUE; | |
4993 | ||
4994 | while (size < pages) | |
4995 | size <<= 1; | |
4996 | ||
4997 | /* | |
4998 | * Once we have dozens or even hundreds of threads sleeping | |
4999 | * on IO we've got bigger problems than wait queue collision. | |
5000 | * Limit the size of the wait table to a reasonable size. | |
5001 | */ | |
5002 | size = min(size, 4096UL); | |
5003 | ||
5004 | return max(size, 4UL); | |
5005 | } | |
cca448fe YG |
5006 | #else |
5007 | /* | |
5008 | * A zone's size might be changed by hot-add, so it is not possible to determine | |
5009 | * a suitable size for its wait_table. So we use the maximum size now. | |
5010 | * | |
5011 | * The max wait table size = 4096 x sizeof(wait_queue_head_t). ie: | |
5012 | * | |
5013 | * i386 (preemption config) : 4096 x 16 = 64Kbyte. | |
5014 | * ia64, x86-64 (no preemption): 4096 x 20 = 80Kbyte. | |
5015 | * ia64, x86-64 (preemption) : 4096 x 24 = 96Kbyte. | |
5016 | * | |
5017 | * The maximum entries are prepared when a zone's memory is (512K + 256) pages | |
5018 | * or more by the traditional way. (See above). It equals: | |
5019 | * | |
5020 | * i386, x86-64, powerpc(4K page size) : = ( 2G + 1M)byte. | |
5021 | * ia64(16K page size) : = ( 8G + 4M)byte. | |
5022 | * powerpc (64K page size) : = (32G +16M)byte. | |
5023 | */ | |
5024 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) | |
5025 | { | |
5026 | return 4096UL; | |
5027 | } | |
5028 | #endif | |
1da177e4 LT |
5029 | |
5030 | /* | |
5031 | * This is an integer logarithm so that shifts can be used later | |
5032 | * to extract the more random high bits from the multiplicative | |
5033 | * hash function before the remainder is taken. | |
5034 | */ | |
5035 | static inline unsigned long wait_table_bits(unsigned long size) | |
5036 | { | |
5037 | return ffz(~size); | |
5038 | } | |
5039 | ||
1da177e4 LT |
5040 | /* |
5041 | * Initially all pages are reserved - free ones are freed | |
5042 | * up by free_all_bootmem() once the early boot process is | |
5043 | * done. Non-atomic initialization, single-pass. | |
5044 | */ | |
c09b4240 | 5045 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
a2f3aa02 | 5046 | unsigned long start_pfn, enum memmap_context context) |
1da177e4 | 5047 | { |
4b94ffdc | 5048 | struct vmem_altmap *altmap = to_vmem_altmap(__pfn_to_phys(start_pfn)); |
29751f69 | 5049 | unsigned long end_pfn = start_pfn + size; |
4b94ffdc | 5050 | pg_data_t *pgdat = NODE_DATA(nid); |
29751f69 | 5051 | unsigned long pfn; |
3a80a7fa | 5052 | unsigned long nr_initialised = 0; |
342332e6 TI |
5053 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
5054 | struct memblock_region *r = NULL, *tmp; | |
5055 | #endif | |
1da177e4 | 5056 | |
22b31eec HD |
5057 | if (highest_memmap_pfn < end_pfn - 1) |
5058 | highest_memmap_pfn = end_pfn - 1; | |
5059 | ||
4b94ffdc DW |
5060 | /* |
5061 | * Honor reservation requested by the driver for this ZONE_DEVICE | |
5062 | * memory | |
5063 | */ | |
5064 | if (altmap && start_pfn == altmap->base_pfn) | |
5065 | start_pfn += altmap->reserve; | |
5066 | ||
cbe8dd4a | 5067 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
a2f3aa02 | 5068 | /* |
b72d0ffb AM |
5069 | * There can be holes in boot-time mem_map[]s handed to this |
5070 | * function. They do not exist on hotplugged memory. | |
a2f3aa02 | 5071 | */ |
b72d0ffb AM |
5072 | if (context != MEMMAP_EARLY) |
5073 | goto not_early; | |
5074 | ||
5075 | if (!early_pfn_valid(pfn)) | |
5076 | continue; | |
5077 | if (!early_pfn_in_nid(pfn, nid)) | |
5078 | continue; | |
5079 | if (!update_defer_init(pgdat, pfn, end_pfn, &nr_initialised)) | |
5080 | break; | |
342332e6 TI |
5081 | |
5082 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP | |
b72d0ffb AM |
5083 | /* |
5084 | * If not mirrored_kernelcore and ZONE_MOVABLE exists, range | |
5085 | * from zone_movable_pfn[nid] to end of each node should be | |
5086 | * ZONE_MOVABLE not ZONE_NORMAL. skip it. | |
5087 | */ | |
5088 | if (!mirrored_kernelcore && zone_movable_pfn[nid]) | |
5089 | if (zone == ZONE_NORMAL && pfn >= zone_movable_pfn[nid]) | |
5090 | continue; | |
342332e6 | 5091 | |
b72d0ffb AM |
5092 | /* |
5093 | * Check given memblock attribute by firmware which can affect | |
5094 | * kernel memory layout. If zone==ZONE_MOVABLE but memory is | |
5095 | * mirrored, it's an overlapped memmap init. skip it. | |
5096 | */ | |
5097 | if (mirrored_kernelcore && zone == ZONE_MOVABLE) { | |
5098 | if (!r || pfn >= memblock_region_memory_end_pfn(r)) { | |
5099 | for_each_memblock(memory, tmp) | |
5100 | if (pfn < memblock_region_memory_end_pfn(tmp)) | |
5101 | break; | |
5102 | r = tmp; | |
5103 | } | |
5104 | if (pfn >= memblock_region_memory_base_pfn(r) && | |
5105 | memblock_is_mirror(r)) { | |
5106 | /* already initialized as NORMAL */ | |
5107 | pfn = memblock_region_memory_end_pfn(r); | |
5108 | continue; | |
342332e6 | 5109 | } |
a2f3aa02 | 5110 | } |
b72d0ffb | 5111 | #endif |
ac5d2539 | 5112 | |
b72d0ffb | 5113 | not_early: |
ac5d2539 MG |
5114 | /* |
5115 | * Mark the block movable so that blocks are reserved for | |
5116 | * movable at startup. This will force kernel allocations | |
5117 | * to reserve their blocks rather than leaking throughout | |
5118 | * the address space during boot when many long-lived | |
974a786e | 5119 | * kernel allocations are made. |
ac5d2539 MG |
5120 | * |
5121 | * bitmap is created for zone's valid pfn range. but memmap | |
5122 | * can be created for invalid pages (for alignment) | |
5123 | * check here not to call set_pageblock_migratetype() against | |
5124 | * pfn out of zone. | |
5125 | */ | |
5126 | if (!(pfn & (pageblock_nr_pages - 1))) { | |
5127 | struct page *page = pfn_to_page(pfn); | |
5128 | ||
5129 | __init_single_page(page, pfn, zone, nid); | |
5130 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
5131 | } else { | |
5132 | __init_single_pfn(pfn, zone, nid); | |
5133 | } | |
1da177e4 LT |
5134 | } |
5135 | } | |
5136 | ||
1e548deb | 5137 | static void __meminit zone_init_free_lists(struct zone *zone) |
1da177e4 | 5138 | { |
7aeb09f9 | 5139 | unsigned int order, t; |
b2a0ac88 MG |
5140 | for_each_migratetype_order(order, t) { |
5141 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
5142 | zone->free_area[order].nr_free = 0; |
5143 | } | |
5144 | } | |
5145 | ||
5146 | #ifndef __HAVE_ARCH_MEMMAP_INIT | |
5147 | #define memmap_init(size, nid, zone, start_pfn) \ | |
a2f3aa02 | 5148 | memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY) |
1da177e4 LT |
5149 | #endif |
5150 | ||
7cd2b0a3 | 5151 | static int zone_batchsize(struct zone *zone) |
e7c8d5c9 | 5152 | { |
3a6be87f | 5153 | #ifdef CONFIG_MMU |
e7c8d5c9 CL |
5154 | int batch; |
5155 | ||
5156 | /* | |
5157 | * The per-cpu-pages pools are set to around 1000th of the | |
ba56e91c | 5158 | * size of the zone. But no more than 1/2 of a meg. |
e7c8d5c9 CL |
5159 | * |
5160 | * OK, so we don't know how big the cache is. So guess. | |
5161 | */ | |
b40da049 | 5162 | batch = zone->managed_pages / 1024; |
ba56e91c SR |
5163 | if (batch * PAGE_SIZE > 512 * 1024) |
5164 | batch = (512 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
5165 | batch /= 4; /* We effectively *= 4 below */ |
5166 | if (batch < 1) | |
5167 | batch = 1; | |
5168 | ||
5169 | /* | |
0ceaacc9 NP |
5170 | * Clamp the batch to a 2^n - 1 value. Having a power |
5171 | * of 2 value was found to be more likely to have | |
5172 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 5173 | * |
0ceaacc9 NP |
5174 | * For example if 2 tasks are alternately allocating |
5175 | * batches of pages, one task can end up with a lot | |
5176 | * of pages of one half of the possible page colors | |
5177 | * and the other with pages of the other colors. | |
e7c8d5c9 | 5178 | */ |
9155203a | 5179 | batch = rounddown_pow_of_two(batch + batch/2) - 1; |
ba56e91c | 5180 | |
e7c8d5c9 | 5181 | return batch; |
3a6be87f DH |
5182 | |
5183 | #else | |
5184 | /* The deferral and batching of frees should be suppressed under NOMMU | |
5185 | * conditions. | |
5186 | * | |
5187 | * The problem is that NOMMU needs to be able to allocate large chunks | |
5188 | * of contiguous memory as there's no hardware page translation to | |
5189 | * assemble apparent contiguous memory from discontiguous pages. | |
5190 | * | |
5191 | * Queueing large contiguous runs of pages for batching, however, | |
5192 | * causes the pages to actually be freed in smaller chunks. As there | |
5193 | * can be a significant delay between the individual batches being | |
5194 | * recycled, this leads to the once large chunks of space being | |
5195 | * fragmented and becoming unavailable for high-order allocations. | |
5196 | */ | |
5197 | return 0; | |
5198 | #endif | |
e7c8d5c9 CL |
5199 | } |
5200 | ||
8d7a8fa9 CS |
5201 | /* |
5202 | * pcp->high and pcp->batch values are related and dependent on one another: | |
5203 | * ->batch must never be higher then ->high. | |
5204 | * The following function updates them in a safe manner without read side | |
5205 | * locking. | |
5206 | * | |
5207 | * Any new users of pcp->batch and pcp->high should ensure they can cope with | |
5208 | * those fields changing asynchronously (acording the the above rule). | |
5209 | * | |
5210 | * mutex_is_locked(&pcp_batch_high_lock) required when calling this function | |
5211 | * outside of boot time (or some other assurance that no concurrent updaters | |
5212 | * exist). | |
5213 | */ | |
5214 | static void pageset_update(struct per_cpu_pages *pcp, unsigned long high, | |
5215 | unsigned long batch) | |
5216 | { | |
5217 | /* start with a fail safe value for batch */ | |
5218 | pcp->batch = 1; | |
5219 | smp_wmb(); | |
5220 | ||
5221 | /* Update high, then batch, in order */ | |
5222 | pcp->high = high; | |
5223 | smp_wmb(); | |
5224 | ||
5225 | pcp->batch = batch; | |
5226 | } | |
5227 | ||
3664033c | 5228 | /* a companion to pageset_set_high() */ |
4008bab7 CS |
5229 | static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch) |
5230 | { | |
8d7a8fa9 | 5231 | pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch)); |
4008bab7 CS |
5232 | } |
5233 | ||
88c90dbc | 5234 | static void pageset_init(struct per_cpu_pageset *p) |
2caaad41 CL |
5235 | { |
5236 | struct per_cpu_pages *pcp; | |
5f8dcc21 | 5237 | int migratetype; |
2caaad41 | 5238 | |
1c6fe946 MD |
5239 | memset(p, 0, sizeof(*p)); |
5240 | ||
3dfa5721 | 5241 | pcp = &p->pcp; |
2caaad41 | 5242 | pcp->count = 0; |
5f8dcc21 MG |
5243 | for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) |
5244 | INIT_LIST_HEAD(&pcp->lists[migratetype]); | |
2caaad41 CL |
5245 | } |
5246 | ||
88c90dbc CS |
5247 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
5248 | { | |
5249 | pageset_init(p); | |
5250 | pageset_set_batch(p, batch); | |
5251 | } | |
5252 | ||
8ad4b1fb | 5253 | /* |
3664033c | 5254 | * pageset_set_high() sets the high water mark for hot per_cpu_pagelist |
8ad4b1fb RS |
5255 | * to the value high for the pageset p. |
5256 | */ | |
3664033c | 5257 | static void pageset_set_high(struct per_cpu_pageset *p, |
8ad4b1fb RS |
5258 | unsigned long high) |
5259 | { | |
8d7a8fa9 CS |
5260 | unsigned long batch = max(1UL, high / 4); |
5261 | if ((high / 4) > (PAGE_SHIFT * 8)) | |
5262 | batch = PAGE_SHIFT * 8; | |
8ad4b1fb | 5263 | |
8d7a8fa9 | 5264 | pageset_update(&p->pcp, high, batch); |
8ad4b1fb RS |
5265 | } |
5266 | ||
7cd2b0a3 DR |
5267 | static void pageset_set_high_and_batch(struct zone *zone, |
5268 | struct per_cpu_pageset *pcp) | |
56cef2b8 | 5269 | { |
56cef2b8 | 5270 | if (percpu_pagelist_fraction) |
3664033c | 5271 | pageset_set_high(pcp, |
56cef2b8 CS |
5272 | (zone->managed_pages / |
5273 | percpu_pagelist_fraction)); | |
5274 | else | |
5275 | pageset_set_batch(pcp, zone_batchsize(zone)); | |
5276 | } | |
5277 | ||
169f6c19 CS |
5278 | static void __meminit zone_pageset_init(struct zone *zone, int cpu) |
5279 | { | |
5280 | struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); | |
5281 | ||
5282 | pageset_init(pcp); | |
5283 | pageset_set_high_and_batch(zone, pcp); | |
5284 | } | |
5285 | ||
4ed7e022 | 5286 | static void __meminit setup_zone_pageset(struct zone *zone) |
319774e2 WF |
5287 | { |
5288 | int cpu; | |
319774e2 | 5289 | zone->pageset = alloc_percpu(struct per_cpu_pageset); |
56cef2b8 CS |
5290 | for_each_possible_cpu(cpu) |
5291 | zone_pageset_init(zone, cpu); | |
75ef7184 MG |
5292 | |
5293 | if (!zone->zone_pgdat->per_cpu_nodestats) { | |
5294 | zone->zone_pgdat->per_cpu_nodestats = | |
5295 | alloc_percpu(struct per_cpu_nodestat); | |
5296 | } | |
319774e2 WF |
5297 | } |
5298 | ||
2caaad41 | 5299 | /* |
99dcc3e5 CL |
5300 | * Allocate per cpu pagesets and initialize them. |
5301 | * Before this call only boot pagesets were available. | |
e7c8d5c9 | 5302 | */ |
99dcc3e5 | 5303 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 | 5304 | { |
99dcc3e5 | 5305 | struct zone *zone; |
e7c8d5c9 | 5306 | |
319774e2 WF |
5307 | for_each_populated_zone(zone) |
5308 | setup_zone_pageset(zone); | |
e7c8d5c9 CL |
5309 | } |
5310 | ||
577a32f6 | 5311 | static noinline __init_refok |
cca448fe | 5312 | int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) |
ed8ece2e DH |
5313 | { |
5314 | int i; | |
cca448fe | 5315 | size_t alloc_size; |
ed8ece2e DH |
5316 | |
5317 | /* | |
5318 | * The per-page waitqueue mechanism uses hashed waitqueues | |
5319 | * per zone. | |
5320 | */ | |
02b694de YG |
5321 | zone->wait_table_hash_nr_entries = |
5322 | wait_table_hash_nr_entries(zone_size_pages); | |
5323 | zone->wait_table_bits = | |
5324 | wait_table_bits(zone->wait_table_hash_nr_entries); | |
cca448fe YG |
5325 | alloc_size = zone->wait_table_hash_nr_entries |
5326 | * sizeof(wait_queue_head_t); | |
5327 | ||
cd94b9db | 5328 | if (!slab_is_available()) { |
cca448fe | 5329 | zone->wait_table = (wait_queue_head_t *) |
6782832e SS |
5330 | memblock_virt_alloc_node_nopanic( |
5331 | alloc_size, zone->zone_pgdat->node_id); | |
cca448fe YG |
5332 | } else { |
5333 | /* | |
5334 | * This case means that a zone whose size was 0 gets new memory | |
5335 | * via memory hot-add. | |
5336 | * But it may be the case that a new node was hot-added. In | |
5337 | * this case vmalloc() will not be able to use this new node's | |
5338 | * memory - this wait_table must be initialized to use this new | |
5339 | * node itself as well. | |
5340 | * To use this new node's memory, further consideration will be | |
5341 | * necessary. | |
5342 | */ | |
8691f3a7 | 5343 | zone->wait_table = vmalloc(alloc_size); |
cca448fe YG |
5344 | } |
5345 | if (!zone->wait_table) | |
5346 | return -ENOMEM; | |
ed8ece2e | 5347 | |
b8af2941 | 5348 | for (i = 0; i < zone->wait_table_hash_nr_entries; ++i) |
ed8ece2e | 5349 | init_waitqueue_head(zone->wait_table + i); |
cca448fe YG |
5350 | |
5351 | return 0; | |
ed8ece2e DH |
5352 | } |
5353 | ||
c09b4240 | 5354 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e | 5355 | { |
99dcc3e5 CL |
5356 | /* |
5357 | * per cpu subsystem is not up at this point. The following code | |
5358 | * relies on the ability of the linker to provide the | |
5359 | * offset of a (static) per cpu variable into the per cpu area. | |
5360 | */ | |
5361 | zone->pageset = &boot_pageset; | |
ed8ece2e | 5362 | |
b38a8725 | 5363 | if (populated_zone(zone)) |
99dcc3e5 CL |
5364 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n", |
5365 | zone->name, zone->present_pages, | |
5366 | zone_batchsize(zone)); | |
ed8ece2e DH |
5367 | } |
5368 | ||
4ed7e022 | 5369 | int __meminit init_currently_empty_zone(struct zone *zone, |
718127cc | 5370 | unsigned long zone_start_pfn, |
b171e409 | 5371 | unsigned long size) |
ed8ece2e DH |
5372 | { |
5373 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe YG |
5374 | int ret; |
5375 | ret = zone_wait_table_init(zone, size); | |
5376 | if (ret) | |
5377 | return ret; | |
ed8ece2e DH |
5378 | pgdat->nr_zones = zone_idx(zone) + 1; |
5379 | ||
ed8ece2e DH |
5380 | zone->zone_start_pfn = zone_start_pfn; |
5381 | ||
708614e6 MG |
5382 | mminit_dprintk(MMINIT_TRACE, "memmap_init", |
5383 | "Initialising map node %d zone %lu pfns %lu -> %lu\n", | |
5384 | pgdat->node_id, | |
5385 | (unsigned long)zone_idx(zone), | |
5386 | zone_start_pfn, (zone_start_pfn + size)); | |
5387 | ||
1e548deb | 5388 | zone_init_free_lists(zone); |
718127cc YG |
5389 | |
5390 | return 0; | |
ed8ece2e DH |
5391 | } |
5392 | ||
0ee332c1 | 5393 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 5394 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
8a942fde | 5395 | |
c713216d MG |
5396 | /* |
5397 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
c713216d | 5398 | */ |
8a942fde MG |
5399 | int __meminit __early_pfn_to_nid(unsigned long pfn, |
5400 | struct mminit_pfnnid_cache *state) | |
c713216d | 5401 | { |
c13291a5 | 5402 | unsigned long start_pfn, end_pfn; |
e76b63f8 | 5403 | int nid; |
7c243c71 | 5404 | |
8a942fde MG |
5405 | if (state->last_start <= pfn && pfn < state->last_end) |
5406 | return state->last_nid; | |
c713216d | 5407 | |
e76b63f8 YL |
5408 | nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn); |
5409 | if (nid != -1) { | |
8a942fde MG |
5410 | state->last_start = start_pfn; |
5411 | state->last_end = end_pfn; | |
5412 | state->last_nid = nid; | |
e76b63f8 YL |
5413 | } |
5414 | ||
5415 | return nid; | |
c713216d MG |
5416 | } |
5417 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
5418 | ||
c713216d | 5419 | /** |
6782832e | 5420 | * free_bootmem_with_active_regions - Call memblock_free_early_nid for each active range |
88ca3b94 | 5421 | * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. |
6782832e | 5422 | * @max_low_pfn: The highest PFN that will be passed to memblock_free_early_nid |
c713216d | 5423 | * |
7d018176 ZZ |
5424 | * If an architecture guarantees that all ranges registered contain no holes |
5425 | * and may be freed, this this function may be used instead of calling | |
5426 | * memblock_free_early_nid() manually. | |
c713216d | 5427 | */ |
c13291a5 | 5428 | void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn) |
cc289894 | 5429 | { |
c13291a5 TH |
5430 | unsigned long start_pfn, end_pfn; |
5431 | int i, this_nid; | |
edbe7d23 | 5432 | |
c13291a5 TH |
5433 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) { |
5434 | start_pfn = min(start_pfn, max_low_pfn); | |
5435 | end_pfn = min(end_pfn, max_low_pfn); | |
edbe7d23 | 5436 | |
c13291a5 | 5437 | if (start_pfn < end_pfn) |
6782832e SS |
5438 | memblock_free_early_nid(PFN_PHYS(start_pfn), |
5439 | (end_pfn - start_pfn) << PAGE_SHIFT, | |
5440 | this_nid); | |
edbe7d23 | 5441 | } |
edbe7d23 | 5442 | } |
edbe7d23 | 5443 | |
c713216d MG |
5444 | /** |
5445 | * sparse_memory_present_with_active_regions - Call memory_present for each active range | |
88ca3b94 | 5446 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
c713216d | 5447 | * |
7d018176 ZZ |
5448 | * If an architecture guarantees that all ranges registered contain no holes and may |
5449 | * be freed, this function may be used instead of calling memory_present() manually. | |
c713216d MG |
5450 | */ |
5451 | void __init sparse_memory_present_with_active_regions(int nid) | |
5452 | { | |
c13291a5 TH |
5453 | unsigned long start_pfn, end_pfn; |
5454 | int i, this_nid; | |
c713216d | 5455 | |
c13291a5 TH |
5456 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) |
5457 | memory_present(this_nid, start_pfn, end_pfn); | |
c713216d MG |
5458 | } |
5459 | ||
5460 | /** | |
5461 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
5462 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
5463 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
5464 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
5465 | * |
5466 | * It returns the start and end page frame of a node based on information | |
7d018176 | 5467 | * provided by memblock_set_node(). If called for a node |
c713216d | 5468 | * with no available memory, a warning is printed and the start and end |
88ca3b94 | 5469 | * PFNs will be 0. |
c713216d | 5470 | */ |
a3142c8e | 5471 | void __meminit get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
5472 | unsigned long *start_pfn, unsigned long *end_pfn) |
5473 | { | |
c13291a5 | 5474 | unsigned long this_start_pfn, this_end_pfn; |
c713216d | 5475 | int i; |
c13291a5 | 5476 | |
c713216d MG |
5477 | *start_pfn = -1UL; |
5478 | *end_pfn = 0; | |
5479 | ||
c13291a5 TH |
5480 | for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) { |
5481 | *start_pfn = min(*start_pfn, this_start_pfn); | |
5482 | *end_pfn = max(*end_pfn, this_end_pfn); | |
c713216d MG |
5483 | } |
5484 | ||
633c0666 | 5485 | if (*start_pfn == -1UL) |
c713216d | 5486 | *start_pfn = 0; |
c713216d MG |
5487 | } |
5488 | ||
2a1e274a MG |
5489 | /* |
5490 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
5491 | * assumption is made that zones within a node are ordered in monotonic | |
5492 | * increasing memory addresses so that the "highest" populated zone is used | |
5493 | */ | |
b69a7288 | 5494 | static void __init find_usable_zone_for_movable(void) |
2a1e274a MG |
5495 | { |
5496 | int zone_index; | |
5497 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
5498 | if (zone_index == ZONE_MOVABLE) | |
5499 | continue; | |
5500 | ||
5501 | if (arch_zone_highest_possible_pfn[zone_index] > | |
5502 | arch_zone_lowest_possible_pfn[zone_index]) | |
5503 | break; | |
5504 | } | |
5505 | ||
5506 | VM_BUG_ON(zone_index == -1); | |
5507 | movable_zone = zone_index; | |
5508 | } | |
5509 | ||
5510 | /* | |
5511 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
25985edc | 5512 | * because it is sized independent of architecture. Unlike the other zones, |
2a1e274a MG |
5513 | * the starting point for ZONE_MOVABLE is not fixed. It may be different |
5514 | * in each node depending on the size of each node and how evenly kernelcore | |
5515 | * is distributed. This helper function adjusts the zone ranges | |
5516 | * provided by the architecture for a given node by using the end of the | |
5517 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
5518 | * zones within a node are in order of monotonic increases memory addresses | |
5519 | */ | |
b69a7288 | 5520 | static void __meminit adjust_zone_range_for_zone_movable(int nid, |
2a1e274a MG |
5521 | unsigned long zone_type, |
5522 | unsigned long node_start_pfn, | |
5523 | unsigned long node_end_pfn, | |
5524 | unsigned long *zone_start_pfn, | |
5525 | unsigned long *zone_end_pfn) | |
5526 | { | |
5527 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
5528 | if (zone_movable_pfn[nid]) { | |
5529 | /* Size ZONE_MOVABLE */ | |
5530 | if (zone_type == ZONE_MOVABLE) { | |
5531 | *zone_start_pfn = zone_movable_pfn[nid]; | |
5532 | *zone_end_pfn = min(node_end_pfn, | |
5533 | arch_zone_highest_possible_pfn[movable_zone]); | |
5534 | ||
2a1e274a MG |
5535 | /* Check if this whole range is within ZONE_MOVABLE */ |
5536 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
5537 | *zone_start_pfn = *zone_end_pfn; | |
5538 | } | |
5539 | } | |
5540 | ||
c713216d MG |
5541 | /* |
5542 | * Return the number of pages a zone spans in a node, including holes | |
5543 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
5544 | */ | |
6ea6e688 | 5545 | static unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d | 5546 | unsigned long zone_type, |
7960aedd ZY |
5547 | unsigned long node_start_pfn, |
5548 | unsigned long node_end_pfn, | |
d91749c1 TI |
5549 | unsigned long *zone_start_pfn, |
5550 | unsigned long *zone_end_pfn, | |
c713216d MG |
5551 | unsigned long *ignored) |
5552 | { | |
b5685e92 | 5553 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
5554 | if (!node_start_pfn && !node_end_pfn) |
5555 | return 0; | |
5556 | ||
7960aedd | 5557 | /* Get the start and end of the zone */ |
d91749c1 TI |
5558 | *zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; |
5559 | *zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; | |
2a1e274a MG |
5560 | adjust_zone_range_for_zone_movable(nid, zone_type, |
5561 | node_start_pfn, node_end_pfn, | |
d91749c1 | 5562 | zone_start_pfn, zone_end_pfn); |
c713216d MG |
5563 | |
5564 | /* Check that this node has pages within the zone's required range */ | |
d91749c1 | 5565 | if (*zone_end_pfn < node_start_pfn || *zone_start_pfn > node_end_pfn) |
c713216d MG |
5566 | return 0; |
5567 | ||
5568 | /* Move the zone boundaries inside the node if necessary */ | |
d91749c1 TI |
5569 | *zone_end_pfn = min(*zone_end_pfn, node_end_pfn); |
5570 | *zone_start_pfn = max(*zone_start_pfn, node_start_pfn); | |
c713216d MG |
5571 | |
5572 | /* Return the spanned pages */ | |
d91749c1 | 5573 | return *zone_end_pfn - *zone_start_pfn; |
c713216d MG |
5574 | } |
5575 | ||
5576 | /* | |
5577 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 5578 | * then all holes in the requested range will be accounted for. |
c713216d | 5579 | */ |
32996250 | 5580 | unsigned long __meminit __absent_pages_in_range(int nid, |
c713216d MG |
5581 | unsigned long range_start_pfn, |
5582 | unsigned long range_end_pfn) | |
5583 | { | |
96e907d1 TH |
5584 | unsigned long nr_absent = range_end_pfn - range_start_pfn; |
5585 | unsigned long start_pfn, end_pfn; | |
5586 | int i; | |
c713216d | 5587 | |
96e907d1 TH |
5588 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
5589 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); | |
5590 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); | |
5591 | nr_absent -= end_pfn - start_pfn; | |
c713216d | 5592 | } |
96e907d1 | 5593 | return nr_absent; |
c713216d MG |
5594 | } |
5595 | ||
5596 | /** | |
5597 | * absent_pages_in_range - Return number of page frames in holes within a range | |
5598 | * @start_pfn: The start PFN to start searching for holes | |
5599 | * @end_pfn: The end PFN to stop searching for holes | |
5600 | * | |
88ca3b94 | 5601 | * It returns the number of pages frames in memory holes within a range. |
c713216d MG |
5602 | */ |
5603 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
5604 | unsigned long end_pfn) | |
5605 | { | |
5606 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
5607 | } | |
5608 | ||
5609 | /* Return the number of page frames in holes in a zone on a node */ | |
6ea6e688 | 5610 | static unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d | 5611 | unsigned long zone_type, |
7960aedd ZY |
5612 | unsigned long node_start_pfn, |
5613 | unsigned long node_end_pfn, | |
c713216d MG |
5614 | unsigned long *ignored) |
5615 | { | |
96e907d1 TH |
5616 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
5617 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; | |
9c7cd687 | 5618 | unsigned long zone_start_pfn, zone_end_pfn; |
342332e6 | 5619 | unsigned long nr_absent; |
9c7cd687 | 5620 | |
b5685e92 | 5621 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
5622 | if (!node_start_pfn && !node_end_pfn) |
5623 | return 0; | |
5624 | ||
96e907d1 TH |
5625 | zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
5626 | zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); | |
9c7cd687 | 5627 | |
2a1e274a MG |
5628 | adjust_zone_range_for_zone_movable(nid, zone_type, |
5629 | node_start_pfn, node_end_pfn, | |
5630 | &zone_start_pfn, &zone_end_pfn); | |
342332e6 TI |
5631 | nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
5632 | ||
5633 | /* | |
5634 | * ZONE_MOVABLE handling. | |
5635 | * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages | |
5636 | * and vice versa. | |
5637 | */ | |
5638 | if (zone_movable_pfn[nid]) { | |
5639 | if (mirrored_kernelcore) { | |
5640 | unsigned long start_pfn, end_pfn; | |
5641 | struct memblock_region *r; | |
5642 | ||
5643 | for_each_memblock(memory, r) { | |
5644 | start_pfn = clamp(memblock_region_memory_base_pfn(r), | |
5645 | zone_start_pfn, zone_end_pfn); | |
5646 | end_pfn = clamp(memblock_region_memory_end_pfn(r), | |
5647 | zone_start_pfn, zone_end_pfn); | |
5648 | ||
5649 | if (zone_type == ZONE_MOVABLE && | |
5650 | memblock_is_mirror(r)) | |
5651 | nr_absent += end_pfn - start_pfn; | |
5652 | ||
5653 | if (zone_type == ZONE_NORMAL && | |
5654 | !memblock_is_mirror(r)) | |
5655 | nr_absent += end_pfn - start_pfn; | |
5656 | } | |
5657 | } else { | |
5658 | if (zone_type == ZONE_NORMAL) | |
5659 | nr_absent += node_end_pfn - zone_movable_pfn[nid]; | |
5660 | } | |
5661 | } | |
5662 | ||
5663 | return nr_absent; | |
c713216d | 5664 | } |
0e0b864e | 5665 | |
0ee332c1 | 5666 | #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
6ea6e688 | 5667 | static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d | 5668 | unsigned long zone_type, |
7960aedd ZY |
5669 | unsigned long node_start_pfn, |
5670 | unsigned long node_end_pfn, | |
d91749c1 TI |
5671 | unsigned long *zone_start_pfn, |
5672 | unsigned long *zone_end_pfn, | |
c713216d MG |
5673 | unsigned long *zones_size) |
5674 | { | |
d91749c1 TI |
5675 | unsigned int zone; |
5676 | ||
5677 | *zone_start_pfn = node_start_pfn; | |
5678 | for (zone = 0; zone < zone_type; zone++) | |
5679 | *zone_start_pfn += zones_size[zone]; | |
5680 | ||
5681 | *zone_end_pfn = *zone_start_pfn + zones_size[zone_type]; | |
5682 | ||
c713216d MG |
5683 | return zones_size[zone_type]; |
5684 | } | |
5685 | ||
6ea6e688 | 5686 | static inline unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d | 5687 | unsigned long zone_type, |
7960aedd ZY |
5688 | unsigned long node_start_pfn, |
5689 | unsigned long node_end_pfn, | |
c713216d MG |
5690 | unsigned long *zholes_size) |
5691 | { | |
5692 | if (!zholes_size) | |
5693 | return 0; | |
5694 | ||
5695 | return zholes_size[zone_type]; | |
5696 | } | |
20e6926d | 5697 | |
0ee332c1 | 5698 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 5699 | |
a3142c8e | 5700 | static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, |
7960aedd ZY |
5701 | unsigned long node_start_pfn, |
5702 | unsigned long node_end_pfn, | |
5703 | unsigned long *zones_size, | |
5704 | unsigned long *zholes_size) | |
c713216d | 5705 | { |
febd5949 | 5706 | unsigned long realtotalpages = 0, totalpages = 0; |
c713216d MG |
5707 | enum zone_type i; |
5708 | ||
febd5949 GZ |
5709 | for (i = 0; i < MAX_NR_ZONES; i++) { |
5710 | struct zone *zone = pgdat->node_zones + i; | |
d91749c1 | 5711 | unsigned long zone_start_pfn, zone_end_pfn; |
febd5949 | 5712 | unsigned long size, real_size; |
c713216d | 5713 | |
febd5949 GZ |
5714 | size = zone_spanned_pages_in_node(pgdat->node_id, i, |
5715 | node_start_pfn, | |
5716 | node_end_pfn, | |
d91749c1 TI |
5717 | &zone_start_pfn, |
5718 | &zone_end_pfn, | |
febd5949 GZ |
5719 | zones_size); |
5720 | real_size = size - zone_absent_pages_in_node(pgdat->node_id, i, | |
7960aedd ZY |
5721 | node_start_pfn, node_end_pfn, |
5722 | zholes_size); | |
d91749c1 TI |
5723 | if (size) |
5724 | zone->zone_start_pfn = zone_start_pfn; | |
5725 | else | |
5726 | zone->zone_start_pfn = 0; | |
febd5949 GZ |
5727 | zone->spanned_pages = size; |
5728 | zone->present_pages = real_size; | |
5729 | ||
5730 | totalpages += size; | |
5731 | realtotalpages += real_size; | |
5732 | } | |
5733 | ||
5734 | pgdat->node_spanned_pages = totalpages; | |
c713216d MG |
5735 | pgdat->node_present_pages = realtotalpages; |
5736 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
5737 | realtotalpages); | |
5738 | } | |
5739 | ||
835c134e MG |
5740 | #ifndef CONFIG_SPARSEMEM |
5741 | /* | |
5742 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
5743 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
5744 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
5745 | * round what is now in bits to nearest long in bits, then return it in |
5746 | * bytes. | |
5747 | */ | |
7c45512d | 5748 | static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize) |
835c134e MG |
5749 | { |
5750 | unsigned long usemapsize; | |
5751 | ||
7c45512d | 5752 | zonesize += zone_start_pfn & (pageblock_nr_pages-1); |
d9c23400 MG |
5753 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
5754 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
5755 | usemapsize *= NR_PAGEBLOCK_BITS; |
5756 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
5757 | ||
5758 | return usemapsize / 8; | |
5759 | } | |
5760 | ||
5761 | static void __init setup_usemap(struct pglist_data *pgdat, | |
7c45512d LT |
5762 | struct zone *zone, |
5763 | unsigned long zone_start_pfn, | |
5764 | unsigned long zonesize) | |
835c134e | 5765 | { |
7c45512d | 5766 | unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize); |
835c134e | 5767 | zone->pageblock_flags = NULL; |
58a01a45 | 5768 | if (usemapsize) |
6782832e SS |
5769 | zone->pageblock_flags = |
5770 | memblock_virt_alloc_node_nopanic(usemapsize, | |
5771 | pgdat->node_id); | |
835c134e MG |
5772 | } |
5773 | #else | |
7c45512d LT |
5774 | static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone, |
5775 | unsigned long zone_start_pfn, unsigned long zonesize) {} | |
835c134e MG |
5776 | #endif /* CONFIG_SPARSEMEM */ |
5777 | ||
d9c23400 | 5778 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
ba72cb8c | 5779 | |
d9c23400 | 5780 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ |
15ca220e | 5781 | void __paginginit set_pageblock_order(void) |
d9c23400 | 5782 | { |
955c1cd7 AM |
5783 | unsigned int order; |
5784 | ||
d9c23400 MG |
5785 | /* Check that pageblock_nr_pages has not already been setup */ |
5786 | if (pageblock_order) | |
5787 | return; | |
5788 | ||
955c1cd7 AM |
5789 | if (HPAGE_SHIFT > PAGE_SHIFT) |
5790 | order = HUGETLB_PAGE_ORDER; | |
5791 | else | |
5792 | order = MAX_ORDER - 1; | |
5793 | ||
d9c23400 MG |
5794 | /* |
5795 | * Assume the largest contiguous order of interest is a huge page. | |
955c1cd7 AM |
5796 | * This value may be variable depending on boot parameters on IA64 and |
5797 | * powerpc. | |
d9c23400 MG |
5798 | */ |
5799 | pageblock_order = order; | |
5800 | } | |
5801 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
5802 | ||
ba72cb8c MG |
5803 | /* |
5804 | * When CONFIG_HUGETLB_PAGE_SIZE_VARIABLE is not set, set_pageblock_order() | |
955c1cd7 AM |
5805 | * is unused as pageblock_order is set at compile-time. See |
5806 | * include/linux/pageblock-flags.h for the values of pageblock_order based on | |
5807 | * the kernel config | |
ba72cb8c | 5808 | */ |
15ca220e | 5809 | void __paginginit set_pageblock_order(void) |
ba72cb8c | 5810 | { |
ba72cb8c | 5811 | } |
d9c23400 MG |
5812 | |
5813 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
5814 | ||
01cefaef JL |
5815 | static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages, |
5816 | unsigned long present_pages) | |
5817 | { | |
5818 | unsigned long pages = spanned_pages; | |
5819 | ||
5820 | /* | |
5821 | * Provide a more accurate estimation if there are holes within | |
5822 | * the zone and SPARSEMEM is in use. If there are holes within the | |
5823 | * zone, each populated memory region may cost us one or two extra | |
5824 | * memmap pages due to alignment because memmap pages for each | |
5825 | * populated regions may not naturally algined on page boundary. | |
5826 | * So the (present_pages >> 4) heuristic is a tradeoff for that. | |
5827 | */ | |
5828 | if (spanned_pages > present_pages + (present_pages >> 4) && | |
5829 | IS_ENABLED(CONFIG_SPARSEMEM)) | |
5830 | pages = present_pages; | |
5831 | ||
5832 | return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; | |
5833 | } | |
5834 | ||
1da177e4 LT |
5835 | /* |
5836 | * Set up the zone data structures: | |
5837 | * - mark all pages reserved | |
5838 | * - mark all memory queues empty | |
5839 | * - clear the memory bitmaps | |
6527af5d MK |
5840 | * |
5841 | * NOTE: pgdat should get zeroed by caller. | |
1da177e4 | 5842 | */ |
7f3eb55b | 5843 | static void __paginginit free_area_init_core(struct pglist_data *pgdat) |
1da177e4 | 5844 | { |
2f1b6248 | 5845 | enum zone_type j; |
ed8ece2e | 5846 | int nid = pgdat->node_id; |
718127cc | 5847 | int ret; |
1da177e4 | 5848 | |
208d54e5 | 5849 | pgdat_resize_init(pgdat); |
8177a420 AA |
5850 | #ifdef CONFIG_NUMA_BALANCING |
5851 | spin_lock_init(&pgdat->numabalancing_migrate_lock); | |
5852 | pgdat->numabalancing_migrate_nr_pages = 0; | |
5853 | pgdat->numabalancing_migrate_next_window = jiffies; | |
a3d0a918 KS |
5854 | #endif |
5855 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
5856 | spin_lock_init(&pgdat->split_queue_lock); | |
5857 | INIT_LIST_HEAD(&pgdat->split_queue); | |
5858 | pgdat->split_queue_len = 0; | |
8177a420 | 5859 | #endif |
1da177e4 | 5860 | init_waitqueue_head(&pgdat->kswapd_wait); |
5515061d | 5861 | init_waitqueue_head(&pgdat->pfmemalloc_wait); |
698b1b30 VB |
5862 | #ifdef CONFIG_COMPACTION |
5863 | init_waitqueue_head(&pgdat->kcompactd_wait); | |
5864 | #endif | |
eefa864b | 5865 | pgdat_page_ext_init(pgdat); |
a52633d8 | 5866 | spin_lock_init(&pgdat->lru_lock); |
a9dd0a83 | 5867 | lruvec_init(node_lruvec(pgdat)); |
5f63b720 | 5868 | |
1da177e4 LT |
5869 | for (j = 0; j < MAX_NR_ZONES; j++) { |
5870 | struct zone *zone = pgdat->node_zones + j; | |
9feedc9d | 5871 | unsigned long size, realsize, freesize, memmap_pages; |
d91749c1 | 5872 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
1da177e4 | 5873 | |
febd5949 GZ |
5874 | size = zone->spanned_pages; |
5875 | realsize = freesize = zone->present_pages; | |
1da177e4 | 5876 | |
0e0b864e | 5877 | /* |
9feedc9d | 5878 | * Adjust freesize so that it accounts for how much memory |
0e0b864e MG |
5879 | * is used by this zone for memmap. This affects the watermark |
5880 | * and per-cpu initialisations | |
5881 | */ | |
01cefaef | 5882 | memmap_pages = calc_memmap_size(size, realsize); |
ba914f48 ZH |
5883 | if (!is_highmem_idx(j)) { |
5884 | if (freesize >= memmap_pages) { | |
5885 | freesize -= memmap_pages; | |
5886 | if (memmap_pages) | |
5887 | printk(KERN_DEBUG | |
5888 | " %s zone: %lu pages used for memmap\n", | |
5889 | zone_names[j], memmap_pages); | |
5890 | } else | |
1170532b | 5891 | pr_warn(" %s zone: %lu pages exceeds freesize %lu\n", |
ba914f48 ZH |
5892 | zone_names[j], memmap_pages, freesize); |
5893 | } | |
0e0b864e | 5894 | |
6267276f | 5895 | /* Account for reserved pages */ |
9feedc9d JL |
5896 | if (j == 0 && freesize > dma_reserve) { |
5897 | freesize -= dma_reserve; | |
d903ef9f | 5898 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
6267276f | 5899 | zone_names[0], dma_reserve); |
0e0b864e MG |
5900 | } |
5901 | ||
98d2b0eb | 5902 | if (!is_highmem_idx(j)) |
9feedc9d | 5903 | nr_kernel_pages += freesize; |
01cefaef JL |
5904 | /* Charge for highmem memmap if there are enough kernel pages */ |
5905 | else if (nr_kernel_pages > memmap_pages * 2) | |
5906 | nr_kernel_pages -= memmap_pages; | |
9feedc9d | 5907 | nr_all_pages += freesize; |
1da177e4 | 5908 | |
9feedc9d JL |
5909 | /* |
5910 | * Set an approximate value for lowmem here, it will be adjusted | |
5911 | * when the bootmem allocator frees pages into the buddy system. | |
5912 | * And all highmem pages will be managed by the buddy system. | |
5913 | */ | |
5914 | zone->managed_pages = is_highmem_idx(j) ? realsize : freesize; | |
9614634f | 5915 | #ifdef CONFIG_NUMA |
d5f541ed | 5916 | zone->node = nid; |
a5f5f91d | 5917 | pgdat->min_unmapped_pages += (freesize*sysctl_min_unmapped_ratio) |
9614634f | 5918 | / 100; |
a5f5f91d | 5919 | pgdat->min_slab_pages += (freesize * sysctl_min_slab_ratio) / 100; |
9614634f | 5920 | #endif |
1da177e4 | 5921 | zone->name = zone_names[j]; |
a52633d8 | 5922 | zone->zone_pgdat = pgdat; |
1da177e4 | 5923 | spin_lock_init(&zone->lock); |
bdc8cb98 | 5924 | zone_seqlock_init(zone); |
ed8ece2e | 5925 | zone_pcp_init(zone); |
81c0a2bb | 5926 | |
1da177e4 LT |
5927 | if (!size) |
5928 | continue; | |
5929 | ||
955c1cd7 | 5930 | set_pageblock_order(); |
7c45512d | 5931 | setup_usemap(pgdat, zone, zone_start_pfn, size); |
b171e409 | 5932 | ret = init_currently_empty_zone(zone, zone_start_pfn, size); |
718127cc | 5933 | BUG_ON(ret); |
76cdd58e | 5934 | memmap_init(size, nid, j, zone_start_pfn); |
1da177e4 LT |
5935 | } |
5936 | } | |
5937 | ||
577a32f6 | 5938 | static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 5939 | { |
b0aeba74 | 5940 | unsigned long __maybe_unused start = 0; |
a1c34a3b LA |
5941 | unsigned long __maybe_unused offset = 0; |
5942 | ||
1da177e4 LT |
5943 | /* Skip empty nodes */ |
5944 | if (!pgdat->node_spanned_pages) | |
5945 | return; | |
5946 | ||
d41dee36 | 5947 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
b0aeba74 TL |
5948 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); |
5949 | offset = pgdat->node_start_pfn - start; | |
1da177e4 LT |
5950 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
5951 | if (!pgdat->node_mem_map) { | |
b0aeba74 | 5952 | unsigned long size, end; |
d41dee36 AW |
5953 | struct page *map; |
5954 | ||
e984bb43 BP |
5955 | /* |
5956 | * The zone's endpoints aren't required to be MAX_ORDER | |
5957 | * aligned but the node_mem_map endpoints must be in order | |
5958 | * for the buddy allocator to function correctly. | |
5959 | */ | |
108bcc96 | 5960 | end = pgdat_end_pfn(pgdat); |
e984bb43 BP |
5961 | end = ALIGN(end, MAX_ORDER_NR_PAGES); |
5962 | size = (end - start) * sizeof(struct page); | |
6f167ec7 DH |
5963 | map = alloc_remap(pgdat->node_id, size); |
5964 | if (!map) | |
6782832e SS |
5965 | map = memblock_virt_alloc_node_nopanic(size, |
5966 | pgdat->node_id); | |
a1c34a3b | 5967 | pgdat->node_mem_map = map + offset; |
1da177e4 | 5968 | } |
12d810c1 | 5969 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
5970 | /* |
5971 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
5972 | */ | |
c713216d | 5973 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 5974 | mem_map = NODE_DATA(0)->node_mem_map; |
a1c34a3b | 5975 | #if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM) |
c713216d | 5976 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) |
a1c34a3b | 5977 | mem_map -= offset; |
0ee332c1 | 5978 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 5979 | } |
1da177e4 | 5980 | #endif |
d41dee36 | 5981 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
1da177e4 LT |
5982 | } |
5983 | ||
9109fb7b JW |
5984 | void __paginginit free_area_init_node(int nid, unsigned long *zones_size, |
5985 | unsigned long node_start_pfn, unsigned long *zholes_size) | |
1da177e4 | 5986 | { |
9109fb7b | 5987 | pg_data_t *pgdat = NODE_DATA(nid); |
7960aedd ZY |
5988 | unsigned long start_pfn = 0; |
5989 | unsigned long end_pfn = 0; | |
9109fb7b | 5990 | |
88fdf75d | 5991 | /* pg_data_t should be reset to zero when it's allocated */ |
38087d9b | 5992 | WARN_ON(pgdat->nr_zones || pgdat->kswapd_classzone_idx); |
88fdf75d | 5993 | |
3a80a7fa | 5994 | reset_deferred_meminit(pgdat); |
1da177e4 LT |
5995 | pgdat->node_id = nid; |
5996 | pgdat->node_start_pfn = node_start_pfn; | |
75ef7184 | 5997 | pgdat->per_cpu_nodestats = NULL; |
7960aedd ZY |
5998 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
5999 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); | |
8d29e18a | 6000 | pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid, |
4ada0c5a ZL |
6001 | (u64)start_pfn << PAGE_SHIFT, |
6002 | end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0); | |
d91749c1 TI |
6003 | #else |
6004 | start_pfn = node_start_pfn; | |
7960aedd ZY |
6005 | #endif |
6006 | calculate_node_totalpages(pgdat, start_pfn, end_pfn, | |
6007 | zones_size, zholes_size); | |
1da177e4 LT |
6008 | |
6009 | alloc_node_mem_map(pgdat); | |
e8c27ac9 YL |
6010 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
6011 | printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n", | |
6012 | nid, (unsigned long)pgdat, | |
6013 | (unsigned long)pgdat->node_mem_map); | |
6014 | #endif | |
1da177e4 | 6015 | |
7f3eb55b | 6016 | free_area_init_core(pgdat); |
1da177e4 LT |
6017 | } |
6018 | ||
0ee332c1 | 6019 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
418508c1 MS |
6020 | |
6021 | #if MAX_NUMNODES > 1 | |
6022 | /* | |
6023 | * Figure out the number of possible node ids. | |
6024 | */ | |
f9872caf | 6025 | void __init setup_nr_node_ids(void) |
418508c1 | 6026 | { |
904a9553 | 6027 | unsigned int highest; |
418508c1 | 6028 | |
904a9553 | 6029 | highest = find_last_bit(node_possible_map.bits, MAX_NUMNODES); |
418508c1 MS |
6030 | nr_node_ids = highest + 1; |
6031 | } | |
418508c1 MS |
6032 | #endif |
6033 | ||
1e01979c TH |
6034 | /** |
6035 | * node_map_pfn_alignment - determine the maximum internode alignment | |
6036 | * | |
6037 | * This function should be called after node map is populated and sorted. | |
6038 | * It calculates the maximum power of two alignment which can distinguish | |
6039 | * all the nodes. | |
6040 | * | |
6041 | * For example, if all nodes are 1GiB and aligned to 1GiB, the return value | |
6042 | * would indicate 1GiB alignment with (1 << (30 - PAGE_SHIFT)). If the | |
6043 | * nodes are shifted by 256MiB, 256MiB. Note that if only the last node is | |
6044 | * shifted, 1GiB is enough and this function will indicate so. | |
6045 | * | |
6046 | * This is used to test whether pfn -> nid mapping of the chosen memory | |
6047 | * model has fine enough granularity to avoid incorrect mapping for the | |
6048 | * populated node map. | |
6049 | * | |
6050 | * Returns the determined alignment in pfn's. 0 if there is no alignment | |
6051 | * requirement (single node). | |
6052 | */ | |
6053 | unsigned long __init node_map_pfn_alignment(void) | |
6054 | { | |
6055 | unsigned long accl_mask = 0, last_end = 0; | |
c13291a5 | 6056 | unsigned long start, end, mask; |
1e01979c | 6057 | int last_nid = -1; |
c13291a5 | 6058 | int i, nid; |
1e01979c | 6059 | |
c13291a5 | 6060 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) { |
1e01979c TH |
6061 | if (!start || last_nid < 0 || last_nid == nid) { |
6062 | last_nid = nid; | |
6063 | last_end = end; | |
6064 | continue; | |
6065 | } | |
6066 | ||
6067 | /* | |
6068 | * Start with a mask granular enough to pin-point to the | |
6069 | * start pfn and tick off bits one-by-one until it becomes | |
6070 | * too coarse to separate the current node from the last. | |
6071 | */ | |
6072 | mask = ~((1 << __ffs(start)) - 1); | |
6073 | while (mask && last_end <= (start & (mask << 1))) | |
6074 | mask <<= 1; | |
6075 | ||
6076 | /* accumulate all internode masks */ | |
6077 | accl_mask |= mask; | |
6078 | } | |
6079 | ||
6080 | /* convert mask to number of pages */ | |
6081 | return ~accl_mask + 1; | |
6082 | } | |
6083 | ||
a6af2bc3 | 6084 | /* Find the lowest pfn for a node */ |
b69a7288 | 6085 | static unsigned long __init find_min_pfn_for_node(int nid) |
c713216d | 6086 | { |
a6af2bc3 | 6087 | unsigned long min_pfn = ULONG_MAX; |
c13291a5 TH |
6088 | unsigned long start_pfn; |
6089 | int i; | |
1abbfb41 | 6090 | |
c13291a5 TH |
6091 | for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL) |
6092 | min_pfn = min(min_pfn, start_pfn); | |
c713216d | 6093 | |
a6af2bc3 | 6094 | if (min_pfn == ULONG_MAX) { |
1170532b | 6095 | pr_warn("Could not find start_pfn for node %d\n", nid); |
a6af2bc3 MG |
6096 | return 0; |
6097 | } | |
6098 | ||
6099 | return min_pfn; | |
c713216d MG |
6100 | } |
6101 | ||
6102 | /** | |
6103 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
6104 | * | |
6105 | * It returns the minimum PFN based on information provided via | |
7d018176 | 6106 | * memblock_set_node(). |
c713216d MG |
6107 | */ |
6108 | unsigned long __init find_min_pfn_with_active_regions(void) | |
6109 | { | |
6110 | return find_min_pfn_for_node(MAX_NUMNODES); | |
6111 | } | |
6112 | ||
37b07e41 LS |
6113 | /* |
6114 | * early_calculate_totalpages() | |
6115 | * Sum pages in active regions for movable zone. | |
4b0ef1fe | 6116 | * Populate N_MEMORY for calculating usable_nodes. |
37b07e41 | 6117 | */ |
484f51f8 | 6118 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef | 6119 | { |
7e63efef | 6120 | unsigned long totalpages = 0; |
c13291a5 TH |
6121 | unsigned long start_pfn, end_pfn; |
6122 | int i, nid; | |
6123 | ||
6124 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { | |
6125 | unsigned long pages = end_pfn - start_pfn; | |
7e63efef | 6126 | |
37b07e41 LS |
6127 | totalpages += pages; |
6128 | if (pages) | |
4b0ef1fe | 6129 | node_set_state(nid, N_MEMORY); |
37b07e41 | 6130 | } |
b8af2941 | 6131 | return totalpages; |
7e63efef MG |
6132 | } |
6133 | ||
2a1e274a MG |
6134 | /* |
6135 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
6136 | * is spread evenly between nodes as long as the nodes have enough | |
6137 | * memory. When they don't, some nodes will have more kernelcore than | |
6138 | * others | |
6139 | */ | |
b224ef85 | 6140 | static void __init find_zone_movable_pfns_for_nodes(void) |
2a1e274a MG |
6141 | { |
6142 | int i, nid; | |
6143 | unsigned long usable_startpfn; | |
6144 | unsigned long kernelcore_node, kernelcore_remaining; | |
66918dcd | 6145 | /* save the state before borrow the nodemask */ |
4b0ef1fe | 6146 | nodemask_t saved_node_state = node_states[N_MEMORY]; |
37b07e41 | 6147 | unsigned long totalpages = early_calculate_totalpages(); |
4b0ef1fe | 6148 | int usable_nodes = nodes_weight(node_states[N_MEMORY]); |
136199f0 | 6149 | struct memblock_region *r; |
b2f3eebe TC |
6150 | |
6151 | /* Need to find movable_zone earlier when movable_node is specified. */ | |
6152 | find_usable_zone_for_movable(); | |
6153 | ||
6154 | /* | |
6155 | * If movable_node is specified, ignore kernelcore and movablecore | |
6156 | * options. | |
6157 | */ | |
6158 | if (movable_node_is_enabled()) { | |
136199f0 EM |
6159 | for_each_memblock(memory, r) { |
6160 | if (!memblock_is_hotpluggable(r)) | |
b2f3eebe TC |
6161 | continue; |
6162 | ||
136199f0 | 6163 | nid = r->nid; |
b2f3eebe | 6164 | |
136199f0 | 6165 | usable_startpfn = PFN_DOWN(r->base); |
b2f3eebe TC |
6166 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? |
6167 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
6168 | usable_startpfn; | |
6169 | } | |
6170 | ||
6171 | goto out2; | |
6172 | } | |
2a1e274a | 6173 | |
342332e6 TI |
6174 | /* |
6175 | * If kernelcore=mirror is specified, ignore movablecore option | |
6176 | */ | |
6177 | if (mirrored_kernelcore) { | |
6178 | bool mem_below_4gb_not_mirrored = false; | |
6179 | ||
6180 | for_each_memblock(memory, r) { | |
6181 | if (memblock_is_mirror(r)) | |
6182 | continue; | |
6183 | ||
6184 | nid = r->nid; | |
6185 | ||
6186 | usable_startpfn = memblock_region_memory_base_pfn(r); | |
6187 | ||
6188 | if (usable_startpfn < 0x100000) { | |
6189 | mem_below_4gb_not_mirrored = true; | |
6190 | continue; | |
6191 | } | |
6192 | ||
6193 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? | |
6194 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
6195 | usable_startpfn; | |
6196 | } | |
6197 | ||
6198 | if (mem_below_4gb_not_mirrored) | |
6199 | pr_warn("This configuration results in unmirrored kernel memory."); | |
6200 | ||
6201 | goto out2; | |
6202 | } | |
6203 | ||
7e63efef | 6204 | /* |
b2f3eebe | 6205 | * If movablecore=nn[KMG] was specified, calculate what size of |
7e63efef MG |
6206 | * kernelcore that corresponds so that memory usable for |
6207 | * any allocation type is evenly spread. If both kernelcore | |
6208 | * and movablecore are specified, then the value of kernelcore | |
6209 | * will be used for required_kernelcore if it's greater than | |
6210 | * what movablecore would have allowed. | |
6211 | */ | |
6212 | if (required_movablecore) { | |
7e63efef MG |
6213 | unsigned long corepages; |
6214 | ||
6215 | /* | |
6216 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
6217 | * was requested by the user | |
6218 | */ | |
6219 | required_movablecore = | |
6220 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
9fd745d4 | 6221 | required_movablecore = min(totalpages, required_movablecore); |
7e63efef MG |
6222 | corepages = totalpages - required_movablecore; |
6223 | ||
6224 | required_kernelcore = max(required_kernelcore, corepages); | |
6225 | } | |
6226 | ||
bde304bd XQ |
6227 | /* |
6228 | * If kernelcore was not specified or kernelcore size is larger | |
6229 | * than totalpages, there is no ZONE_MOVABLE. | |
6230 | */ | |
6231 | if (!required_kernelcore || required_kernelcore >= totalpages) | |
66918dcd | 6232 | goto out; |
2a1e274a MG |
6233 | |
6234 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
2a1e274a MG |
6235 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; |
6236 | ||
6237 | restart: | |
6238 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
6239 | kernelcore_node = required_kernelcore / usable_nodes; | |
4b0ef1fe | 6240 | for_each_node_state(nid, N_MEMORY) { |
c13291a5 TH |
6241 | unsigned long start_pfn, end_pfn; |
6242 | ||
2a1e274a MG |
6243 | /* |
6244 | * Recalculate kernelcore_node if the division per node | |
6245 | * now exceeds what is necessary to satisfy the requested | |
6246 | * amount of memory for the kernel | |
6247 | */ | |
6248 | if (required_kernelcore < kernelcore_node) | |
6249 | kernelcore_node = required_kernelcore / usable_nodes; | |
6250 | ||
6251 | /* | |
6252 | * As the map is walked, we track how much memory is usable | |
6253 | * by the kernel using kernelcore_remaining. When it is | |
6254 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
6255 | */ | |
6256 | kernelcore_remaining = kernelcore_node; | |
6257 | ||
6258 | /* Go through each range of PFNs within this node */ | |
c13291a5 | 6259 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
2a1e274a MG |
6260 | unsigned long size_pages; |
6261 | ||
c13291a5 | 6262 | start_pfn = max(start_pfn, zone_movable_pfn[nid]); |
2a1e274a MG |
6263 | if (start_pfn >= end_pfn) |
6264 | continue; | |
6265 | ||
6266 | /* Account for what is only usable for kernelcore */ | |
6267 | if (start_pfn < usable_startpfn) { | |
6268 | unsigned long kernel_pages; | |
6269 | kernel_pages = min(end_pfn, usable_startpfn) | |
6270 | - start_pfn; | |
6271 | ||
6272 | kernelcore_remaining -= min(kernel_pages, | |
6273 | kernelcore_remaining); | |
6274 | required_kernelcore -= min(kernel_pages, | |
6275 | required_kernelcore); | |
6276 | ||
6277 | /* Continue if range is now fully accounted */ | |
6278 | if (end_pfn <= usable_startpfn) { | |
6279 | ||
6280 | /* | |
6281 | * Push zone_movable_pfn to the end so | |
6282 | * that if we have to rebalance | |
6283 | * kernelcore across nodes, we will | |
6284 | * not double account here | |
6285 | */ | |
6286 | zone_movable_pfn[nid] = end_pfn; | |
6287 | continue; | |
6288 | } | |
6289 | start_pfn = usable_startpfn; | |
6290 | } | |
6291 | ||
6292 | /* | |
6293 | * The usable PFN range for ZONE_MOVABLE is from | |
6294 | * start_pfn->end_pfn. Calculate size_pages as the | |
6295 | * number of pages used as kernelcore | |
6296 | */ | |
6297 | size_pages = end_pfn - start_pfn; | |
6298 | if (size_pages > kernelcore_remaining) | |
6299 | size_pages = kernelcore_remaining; | |
6300 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
6301 | ||
6302 | /* | |
6303 | * Some kernelcore has been met, update counts and | |
6304 | * break if the kernelcore for this node has been | |
b8af2941 | 6305 | * satisfied |
2a1e274a MG |
6306 | */ |
6307 | required_kernelcore -= min(required_kernelcore, | |
6308 | size_pages); | |
6309 | kernelcore_remaining -= size_pages; | |
6310 | if (!kernelcore_remaining) | |
6311 | break; | |
6312 | } | |
6313 | } | |
6314 | ||
6315 | /* | |
6316 | * If there is still required_kernelcore, we do another pass with one | |
6317 | * less node in the count. This will push zone_movable_pfn[nid] further | |
6318 | * along on the nodes that still have memory until kernelcore is | |
b8af2941 | 6319 | * satisfied |
2a1e274a MG |
6320 | */ |
6321 | usable_nodes--; | |
6322 | if (usable_nodes && required_kernelcore > usable_nodes) | |
6323 | goto restart; | |
6324 | ||
b2f3eebe | 6325 | out2: |
2a1e274a MG |
6326 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ |
6327 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
6328 | zone_movable_pfn[nid] = | |
6329 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
66918dcd | 6330 | |
20e6926d | 6331 | out: |
66918dcd | 6332 | /* restore the node_state */ |
4b0ef1fe | 6333 | node_states[N_MEMORY] = saved_node_state; |
2a1e274a MG |
6334 | } |
6335 | ||
4b0ef1fe LJ |
6336 | /* Any regular or high memory on that node ? */ |
6337 | static void check_for_memory(pg_data_t *pgdat, int nid) | |
37b07e41 | 6338 | { |
37b07e41 LS |
6339 | enum zone_type zone_type; |
6340 | ||
4b0ef1fe LJ |
6341 | if (N_MEMORY == N_NORMAL_MEMORY) |
6342 | return; | |
6343 | ||
6344 | for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) { | |
37b07e41 | 6345 | struct zone *zone = &pgdat->node_zones[zone_type]; |
b38a8725 | 6346 | if (populated_zone(zone)) { |
4b0ef1fe LJ |
6347 | node_set_state(nid, N_HIGH_MEMORY); |
6348 | if (N_NORMAL_MEMORY != N_HIGH_MEMORY && | |
6349 | zone_type <= ZONE_NORMAL) | |
6350 | node_set_state(nid, N_NORMAL_MEMORY); | |
d0048b0e BL |
6351 | break; |
6352 | } | |
37b07e41 | 6353 | } |
37b07e41 LS |
6354 | } |
6355 | ||
c713216d MG |
6356 | /** |
6357 | * free_area_init_nodes - Initialise all pg_data_t and zone data | |
88ca3b94 | 6358 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
6359 | * |
6360 | * This will call free_area_init_node() for each active node in the system. | |
7d018176 | 6361 | * Using the page ranges provided by memblock_set_node(), the size of each |
c713216d MG |
6362 | * zone in each node and their holes is calculated. If the maximum PFN |
6363 | * between two adjacent zones match, it is assumed that the zone is empty. | |
6364 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
6365 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
6366 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
6367 | * at arch_max_dma_pfn. | |
6368 | */ | |
6369 | void __init free_area_init_nodes(unsigned long *max_zone_pfn) | |
6370 | { | |
c13291a5 TH |
6371 | unsigned long start_pfn, end_pfn; |
6372 | int i, nid; | |
a6af2bc3 | 6373 | |
c713216d MG |
6374 | /* Record where the zone boundaries are */ |
6375 | memset(arch_zone_lowest_possible_pfn, 0, | |
6376 | sizeof(arch_zone_lowest_possible_pfn)); | |
6377 | memset(arch_zone_highest_possible_pfn, 0, | |
6378 | sizeof(arch_zone_highest_possible_pfn)); | |
90cae1fe OH |
6379 | |
6380 | start_pfn = find_min_pfn_with_active_regions(); | |
6381 | ||
6382 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2a1e274a MG |
6383 | if (i == ZONE_MOVABLE) |
6384 | continue; | |
90cae1fe OH |
6385 | |
6386 | end_pfn = max(max_zone_pfn[i], start_pfn); | |
6387 | arch_zone_lowest_possible_pfn[i] = start_pfn; | |
6388 | arch_zone_highest_possible_pfn[i] = end_pfn; | |
6389 | ||
6390 | start_pfn = end_pfn; | |
c713216d | 6391 | } |
2a1e274a MG |
6392 | arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0; |
6393 | arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0; | |
6394 | ||
6395 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
6396 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
b224ef85 | 6397 | find_zone_movable_pfns_for_nodes(); |
c713216d | 6398 | |
c713216d | 6399 | /* Print out the zone ranges */ |
f88dfff5 | 6400 | pr_info("Zone ranges:\n"); |
2a1e274a MG |
6401 | for (i = 0; i < MAX_NR_ZONES; i++) { |
6402 | if (i == ZONE_MOVABLE) | |
6403 | continue; | |
f88dfff5 | 6404 | pr_info(" %-8s ", zone_names[i]); |
72f0ba02 DR |
6405 | if (arch_zone_lowest_possible_pfn[i] == |
6406 | arch_zone_highest_possible_pfn[i]) | |
f88dfff5 | 6407 | pr_cont("empty\n"); |
72f0ba02 | 6408 | else |
8d29e18a JG |
6409 | pr_cont("[mem %#018Lx-%#018Lx]\n", |
6410 | (u64)arch_zone_lowest_possible_pfn[i] | |
6411 | << PAGE_SHIFT, | |
6412 | ((u64)arch_zone_highest_possible_pfn[i] | |
a62e2f4f | 6413 | << PAGE_SHIFT) - 1); |
2a1e274a MG |
6414 | } |
6415 | ||
6416 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
f88dfff5 | 6417 | pr_info("Movable zone start for each node\n"); |
2a1e274a MG |
6418 | for (i = 0; i < MAX_NUMNODES; i++) { |
6419 | if (zone_movable_pfn[i]) | |
8d29e18a JG |
6420 | pr_info(" Node %d: %#018Lx\n", i, |
6421 | (u64)zone_movable_pfn[i] << PAGE_SHIFT); | |
2a1e274a | 6422 | } |
c713216d | 6423 | |
f2d52fe5 | 6424 | /* Print out the early node map */ |
f88dfff5 | 6425 | pr_info("Early memory node ranges\n"); |
c13291a5 | 6426 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) |
8d29e18a JG |
6427 | pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, |
6428 | (u64)start_pfn << PAGE_SHIFT, | |
6429 | ((u64)end_pfn << PAGE_SHIFT) - 1); | |
c713216d MG |
6430 | |
6431 | /* Initialise every node */ | |
708614e6 | 6432 | mminit_verify_pageflags_layout(); |
8ef82866 | 6433 | setup_nr_node_ids(); |
c713216d MG |
6434 | for_each_online_node(nid) { |
6435 | pg_data_t *pgdat = NODE_DATA(nid); | |
9109fb7b | 6436 | free_area_init_node(nid, NULL, |
c713216d | 6437 | find_min_pfn_for_node(nid), NULL); |
37b07e41 LS |
6438 | |
6439 | /* Any memory on that node */ | |
6440 | if (pgdat->node_present_pages) | |
4b0ef1fe LJ |
6441 | node_set_state(nid, N_MEMORY); |
6442 | check_for_memory(pgdat, nid); | |
c713216d MG |
6443 | } |
6444 | } | |
2a1e274a | 6445 | |
7e63efef | 6446 | static int __init cmdline_parse_core(char *p, unsigned long *core) |
2a1e274a MG |
6447 | { |
6448 | unsigned long long coremem; | |
6449 | if (!p) | |
6450 | return -EINVAL; | |
6451 | ||
6452 | coremem = memparse(p, &p); | |
7e63efef | 6453 | *core = coremem >> PAGE_SHIFT; |
2a1e274a | 6454 | |
7e63efef | 6455 | /* Paranoid check that UL is enough for the coremem value */ |
2a1e274a MG |
6456 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); |
6457 | ||
6458 | return 0; | |
6459 | } | |
ed7ed365 | 6460 | |
7e63efef MG |
6461 | /* |
6462 | * kernelcore=size sets the amount of memory for use for allocations that | |
6463 | * cannot be reclaimed or migrated. | |
6464 | */ | |
6465 | static int __init cmdline_parse_kernelcore(char *p) | |
6466 | { | |
342332e6 TI |
6467 | /* parse kernelcore=mirror */ |
6468 | if (parse_option_str(p, "mirror")) { | |
6469 | mirrored_kernelcore = true; | |
6470 | return 0; | |
6471 | } | |
6472 | ||
7e63efef MG |
6473 | return cmdline_parse_core(p, &required_kernelcore); |
6474 | } | |
6475 | ||
6476 | /* | |
6477 | * movablecore=size sets the amount of memory for use for allocations that | |
6478 | * can be reclaimed or migrated. | |
6479 | */ | |
6480 | static int __init cmdline_parse_movablecore(char *p) | |
6481 | { | |
6482 | return cmdline_parse_core(p, &required_movablecore); | |
6483 | } | |
6484 | ||
ed7ed365 | 6485 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 6486 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 6487 | |
0ee332c1 | 6488 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
c713216d | 6489 | |
c3d5f5f0 JL |
6490 | void adjust_managed_page_count(struct page *page, long count) |
6491 | { | |
6492 | spin_lock(&managed_page_count_lock); | |
6493 | page_zone(page)->managed_pages += count; | |
6494 | totalram_pages += count; | |
3dcc0571 JL |
6495 | #ifdef CONFIG_HIGHMEM |
6496 | if (PageHighMem(page)) | |
6497 | totalhigh_pages += count; | |
6498 | #endif | |
c3d5f5f0 JL |
6499 | spin_unlock(&managed_page_count_lock); |
6500 | } | |
3dcc0571 | 6501 | EXPORT_SYMBOL(adjust_managed_page_count); |
c3d5f5f0 | 6502 | |
11199692 | 6503 | unsigned long free_reserved_area(void *start, void *end, int poison, char *s) |
69afade7 | 6504 | { |
11199692 JL |
6505 | void *pos; |
6506 | unsigned long pages = 0; | |
69afade7 | 6507 | |
11199692 JL |
6508 | start = (void *)PAGE_ALIGN((unsigned long)start); |
6509 | end = (void *)((unsigned long)end & PAGE_MASK); | |
6510 | for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { | |
dbe67df4 | 6511 | if ((unsigned int)poison <= 0xFF) |
11199692 JL |
6512 | memset(pos, poison, PAGE_SIZE); |
6513 | free_reserved_page(virt_to_page(pos)); | |
69afade7 JL |
6514 | } |
6515 | ||
6516 | if (pages && s) | |
11199692 | 6517 | pr_info("Freeing %s memory: %ldK (%p - %p)\n", |
69afade7 JL |
6518 | s, pages << (PAGE_SHIFT - 10), start, end); |
6519 | ||
6520 | return pages; | |
6521 | } | |
11199692 | 6522 | EXPORT_SYMBOL(free_reserved_area); |
69afade7 | 6523 | |
cfa11e08 JL |
6524 | #ifdef CONFIG_HIGHMEM |
6525 | void free_highmem_page(struct page *page) | |
6526 | { | |
6527 | __free_reserved_page(page); | |
6528 | totalram_pages++; | |
7b4b2a0d | 6529 | page_zone(page)->managed_pages++; |
cfa11e08 JL |
6530 | totalhigh_pages++; |
6531 | } | |
6532 | #endif | |
6533 | ||
7ee3d4e8 JL |
6534 | |
6535 | void __init mem_init_print_info(const char *str) | |
6536 | { | |
6537 | unsigned long physpages, codesize, datasize, rosize, bss_size; | |
6538 | unsigned long init_code_size, init_data_size; | |
6539 | ||
6540 | physpages = get_num_physpages(); | |
6541 | codesize = _etext - _stext; | |
6542 | datasize = _edata - _sdata; | |
6543 | rosize = __end_rodata - __start_rodata; | |
6544 | bss_size = __bss_stop - __bss_start; | |
6545 | init_data_size = __init_end - __init_begin; | |
6546 | init_code_size = _einittext - _sinittext; | |
6547 | ||
6548 | /* | |
6549 | * Detect special cases and adjust section sizes accordingly: | |
6550 | * 1) .init.* may be embedded into .data sections | |
6551 | * 2) .init.text.* may be out of [__init_begin, __init_end], | |
6552 | * please refer to arch/tile/kernel/vmlinux.lds.S. | |
6553 | * 3) .rodata.* may be embedded into .text or .data sections. | |
6554 | */ | |
6555 | #define adj_init_size(start, end, size, pos, adj) \ | |
b8af2941 PK |
6556 | do { \ |
6557 | if (start <= pos && pos < end && size > adj) \ | |
6558 | size -= adj; \ | |
6559 | } while (0) | |
7ee3d4e8 JL |
6560 | |
6561 | adj_init_size(__init_begin, __init_end, init_data_size, | |
6562 | _sinittext, init_code_size); | |
6563 | adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size); | |
6564 | adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size); | |
6565 | adj_init_size(_stext, _etext, codesize, __start_rodata, rosize); | |
6566 | adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize); | |
6567 | ||
6568 | #undef adj_init_size | |
6569 | ||
756a025f | 6570 | pr_info("Memory: %luK/%luK available (%luK kernel code, %luK rwdata, %luK rodata, %luK init, %luK bss, %luK reserved, %luK cma-reserved" |
7ee3d4e8 | 6571 | #ifdef CONFIG_HIGHMEM |
756a025f | 6572 | ", %luK highmem" |
7ee3d4e8 | 6573 | #endif |
756a025f JP |
6574 | "%s%s)\n", |
6575 | nr_free_pages() << (PAGE_SHIFT - 10), | |
6576 | physpages << (PAGE_SHIFT - 10), | |
6577 | codesize >> 10, datasize >> 10, rosize >> 10, | |
6578 | (init_data_size + init_code_size) >> 10, bss_size >> 10, | |
6579 | (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - 10), | |
6580 | totalcma_pages << (PAGE_SHIFT - 10), | |
7ee3d4e8 | 6581 | #ifdef CONFIG_HIGHMEM |
756a025f | 6582 | totalhigh_pages << (PAGE_SHIFT - 10), |
7ee3d4e8 | 6583 | #endif |
756a025f | 6584 | str ? ", " : "", str ? str : ""); |
7ee3d4e8 JL |
6585 | } |
6586 | ||
0e0b864e | 6587 | /** |
88ca3b94 RD |
6588 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
6589 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e | 6590 | * |
013110a7 | 6591 | * The per-cpu batchsize and zone watermarks are determined by managed_pages. |
0e0b864e MG |
6592 | * In the DMA zone, a significant percentage may be consumed by kernel image |
6593 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
6594 | * function may optionally be used to account for unfreeable pages in the |
6595 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
6596 | * smaller per-cpu batchsize. | |
0e0b864e MG |
6597 | */ |
6598 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
6599 | { | |
6600 | dma_reserve = new_dma_reserve; | |
6601 | } | |
6602 | ||
1da177e4 LT |
6603 | void __init free_area_init(unsigned long *zones_size) |
6604 | { | |
9109fb7b | 6605 | free_area_init_node(0, zones_size, |
1da177e4 LT |
6606 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
6607 | } | |
1da177e4 | 6608 | |
1da177e4 LT |
6609 | static int page_alloc_cpu_notify(struct notifier_block *self, |
6610 | unsigned long action, void *hcpu) | |
6611 | { | |
6612 | int cpu = (unsigned long)hcpu; | |
1da177e4 | 6613 | |
8bb78442 | 6614 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
f0cb3c76 | 6615 | lru_add_drain_cpu(cpu); |
9f8f2172 CL |
6616 | drain_pages(cpu); |
6617 | ||
6618 | /* | |
6619 | * Spill the event counters of the dead processor | |
6620 | * into the current processors event counters. | |
6621 | * This artificially elevates the count of the current | |
6622 | * processor. | |
6623 | */ | |
f8891e5e | 6624 | vm_events_fold_cpu(cpu); |
9f8f2172 CL |
6625 | |
6626 | /* | |
6627 | * Zero the differential counters of the dead processor | |
6628 | * so that the vm statistics are consistent. | |
6629 | * | |
6630 | * This is only okay since the processor is dead and cannot | |
6631 | * race with what we are doing. | |
6632 | */ | |
2bb921e5 | 6633 | cpu_vm_stats_fold(cpu); |
1da177e4 LT |
6634 | } |
6635 | return NOTIFY_OK; | |
6636 | } | |
1da177e4 LT |
6637 | |
6638 | void __init page_alloc_init(void) | |
6639 | { | |
6640 | hotcpu_notifier(page_alloc_cpu_notify, 0); | |
6641 | } | |
6642 | ||
cb45b0e9 | 6643 | /* |
34b10060 | 6644 | * calculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio |
cb45b0e9 HA |
6645 | * or min_free_kbytes changes. |
6646 | */ | |
6647 | static void calculate_totalreserve_pages(void) | |
6648 | { | |
6649 | struct pglist_data *pgdat; | |
6650 | unsigned long reserve_pages = 0; | |
2f6726e5 | 6651 | enum zone_type i, j; |
cb45b0e9 HA |
6652 | |
6653 | for_each_online_pgdat(pgdat) { | |
281e3726 MG |
6654 | |
6655 | pgdat->totalreserve_pages = 0; | |
6656 | ||
cb45b0e9 HA |
6657 | for (i = 0; i < MAX_NR_ZONES; i++) { |
6658 | struct zone *zone = pgdat->node_zones + i; | |
3484b2de | 6659 | long max = 0; |
cb45b0e9 HA |
6660 | |
6661 | /* Find valid and maximum lowmem_reserve in the zone */ | |
6662 | for (j = i; j < MAX_NR_ZONES; j++) { | |
6663 | if (zone->lowmem_reserve[j] > max) | |
6664 | max = zone->lowmem_reserve[j]; | |
6665 | } | |
6666 | ||
41858966 MG |
6667 | /* we treat the high watermark as reserved pages. */ |
6668 | max += high_wmark_pages(zone); | |
cb45b0e9 | 6669 | |
b40da049 JL |
6670 | if (max > zone->managed_pages) |
6671 | max = zone->managed_pages; | |
a8d01437 | 6672 | |
281e3726 | 6673 | pgdat->totalreserve_pages += max; |
a8d01437 | 6674 | |
cb45b0e9 HA |
6675 | reserve_pages += max; |
6676 | } | |
6677 | } | |
6678 | totalreserve_pages = reserve_pages; | |
6679 | } | |
6680 | ||
1da177e4 LT |
6681 | /* |
6682 | * setup_per_zone_lowmem_reserve - called whenever | |
34b10060 | 6683 | * sysctl_lowmem_reserve_ratio changes. Ensures that each zone |
1da177e4 LT |
6684 | * has a correct pages reserved value, so an adequate number of |
6685 | * pages are left in the zone after a successful __alloc_pages(). | |
6686 | */ | |
6687 | static void setup_per_zone_lowmem_reserve(void) | |
6688 | { | |
6689 | struct pglist_data *pgdat; | |
2f6726e5 | 6690 | enum zone_type j, idx; |
1da177e4 | 6691 | |
ec936fc5 | 6692 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
6693 | for (j = 0; j < MAX_NR_ZONES; j++) { |
6694 | struct zone *zone = pgdat->node_zones + j; | |
b40da049 | 6695 | unsigned long managed_pages = zone->managed_pages; |
1da177e4 LT |
6696 | |
6697 | zone->lowmem_reserve[j] = 0; | |
6698 | ||
2f6726e5 CL |
6699 | idx = j; |
6700 | while (idx) { | |
1da177e4 LT |
6701 | struct zone *lower_zone; |
6702 | ||
2f6726e5 CL |
6703 | idx--; |
6704 | ||
1da177e4 LT |
6705 | if (sysctl_lowmem_reserve_ratio[idx] < 1) |
6706 | sysctl_lowmem_reserve_ratio[idx] = 1; | |
6707 | ||
6708 | lower_zone = pgdat->node_zones + idx; | |
b40da049 | 6709 | lower_zone->lowmem_reserve[j] = managed_pages / |
1da177e4 | 6710 | sysctl_lowmem_reserve_ratio[idx]; |
b40da049 | 6711 | managed_pages += lower_zone->managed_pages; |
1da177e4 LT |
6712 | } |
6713 | } | |
6714 | } | |
cb45b0e9 HA |
6715 | |
6716 | /* update totalreserve_pages */ | |
6717 | calculate_totalreserve_pages(); | |
1da177e4 LT |
6718 | } |
6719 | ||
cfd3da1e | 6720 | static void __setup_per_zone_wmarks(void) |
1da177e4 LT |
6721 | { |
6722 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
6723 | unsigned long lowmem_pages = 0; | |
6724 | struct zone *zone; | |
6725 | unsigned long flags; | |
6726 | ||
6727 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
6728 | for_each_zone(zone) { | |
6729 | if (!is_highmem(zone)) | |
b40da049 | 6730 | lowmem_pages += zone->managed_pages; |
1da177e4 LT |
6731 | } |
6732 | ||
6733 | for_each_zone(zone) { | |
ac924c60 AM |
6734 | u64 tmp; |
6735 | ||
1125b4e3 | 6736 | spin_lock_irqsave(&zone->lock, flags); |
b40da049 | 6737 | tmp = (u64)pages_min * zone->managed_pages; |
ac924c60 | 6738 | do_div(tmp, lowmem_pages); |
1da177e4 LT |
6739 | if (is_highmem(zone)) { |
6740 | /* | |
669ed175 NP |
6741 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
6742 | * need highmem pages, so cap pages_min to a small | |
6743 | * value here. | |
6744 | * | |
41858966 | 6745 | * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN) |
42ff2703 | 6746 | * deltas control asynch page reclaim, and so should |
669ed175 | 6747 | * not be capped for highmem. |
1da177e4 | 6748 | */ |
90ae8d67 | 6749 | unsigned long min_pages; |
1da177e4 | 6750 | |
b40da049 | 6751 | min_pages = zone->managed_pages / 1024; |
90ae8d67 | 6752 | min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); |
41858966 | 6753 | zone->watermark[WMARK_MIN] = min_pages; |
1da177e4 | 6754 | } else { |
669ed175 NP |
6755 | /* |
6756 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
6757 | * proportionate to the zone's size. |
6758 | */ | |
41858966 | 6759 | zone->watermark[WMARK_MIN] = tmp; |
1da177e4 LT |
6760 | } |
6761 | ||
795ae7a0 JW |
6762 | /* |
6763 | * Set the kswapd watermarks distance according to the | |
6764 | * scale factor in proportion to available memory, but | |
6765 | * ensure a minimum size on small systems. | |
6766 | */ | |
6767 | tmp = max_t(u64, tmp >> 2, | |
6768 | mult_frac(zone->managed_pages, | |
6769 | watermark_scale_factor, 10000)); | |
6770 | ||
6771 | zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; | |
6772 | zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2; | |
49f223a9 | 6773 | |
1125b4e3 | 6774 | spin_unlock_irqrestore(&zone->lock, flags); |
1da177e4 | 6775 | } |
cb45b0e9 HA |
6776 | |
6777 | /* update totalreserve_pages */ | |
6778 | calculate_totalreserve_pages(); | |
1da177e4 LT |
6779 | } |
6780 | ||
cfd3da1e MG |
6781 | /** |
6782 | * setup_per_zone_wmarks - called when min_free_kbytes changes | |
6783 | * or when memory is hot-{added|removed} | |
6784 | * | |
6785 | * Ensures that the watermark[min,low,high] values for each zone are set | |
6786 | * correctly with respect to min_free_kbytes. | |
6787 | */ | |
6788 | void setup_per_zone_wmarks(void) | |
6789 | { | |
6790 | mutex_lock(&zonelists_mutex); | |
6791 | __setup_per_zone_wmarks(); | |
6792 | mutex_unlock(&zonelists_mutex); | |
6793 | } | |
6794 | ||
1da177e4 LT |
6795 | /* |
6796 | * Initialise min_free_kbytes. | |
6797 | * | |
6798 | * For small machines we want it small (128k min). For large machines | |
6799 | * we want it large (64MB max). But it is not linear, because network | |
6800 | * bandwidth does not increase linearly with machine size. We use | |
6801 | * | |
b8af2941 | 6802 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: |
1da177e4 LT |
6803 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) |
6804 | * | |
6805 | * which yields | |
6806 | * | |
6807 | * 16MB: 512k | |
6808 | * 32MB: 724k | |
6809 | * 64MB: 1024k | |
6810 | * 128MB: 1448k | |
6811 | * 256MB: 2048k | |
6812 | * 512MB: 2896k | |
6813 | * 1024MB: 4096k | |
6814 | * 2048MB: 5792k | |
6815 | * 4096MB: 8192k | |
6816 | * 8192MB: 11584k | |
6817 | * 16384MB: 16384k | |
6818 | */ | |
1b79acc9 | 6819 | int __meminit init_per_zone_wmark_min(void) |
1da177e4 LT |
6820 | { |
6821 | unsigned long lowmem_kbytes; | |
5f12733e | 6822 | int new_min_free_kbytes; |
1da177e4 LT |
6823 | |
6824 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
5f12733e MH |
6825 | new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16); |
6826 | ||
6827 | if (new_min_free_kbytes > user_min_free_kbytes) { | |
6828 | min_free_kbytes = new_min_free_kbytes; | |
6829 | if (min_free_kbytes < 128) | |
6830 | min_free_kbytes = 128; | |
6831 | if (min_free_kbytes > 65536) | |
6832 | min_free_kbytes = 65536; | |
6833 | } else { | |
6834 | pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n", | |
6835 | new_min_free_kbytes, user_min_free_kbytes); | |
6836 | } | |
bc75d33f | 6837 | setup_per_zone_wmarks(); |
a6cccdc3 | 6838 | refresh_zone_stat_thresholds(); |
1da177e4 LT |
6839 | setup_per_zone_lowmem_reserve(); |
6840 | return 0; | |
6841 | } | |
bc22af74 | 6842 | core_initcall(init_per_zone_wmark_min) |
1da177e4 LT |
6843 | |
6844 | /* | |
b8af2941 | 6845 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so |
1da177e4 LT |
6846 | * that we can call two helper functions whenever min_free_kbytes |
6847 | * changes. | |
6848 | */ | |
cccad5b9 | 6849 | int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6850 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 6851 | { |
da8c757b HP |
6852 | int rc; |
6853 | ||
6854 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
6855 | if (rc) | |
6856 | return rc; | |
6857 | ||
5f12733e MH |
6858 | if (write) { |
6859 | user_min_free_kbytes = min_free_kbytes; | |
bc75d33f | 6860 | setup_per_zone_wmarks(); |
5f12733e | 6861 | } |
1da177e4 LT |
6862 | return 0; |
6863 | } | |
6864 | ||
795ae7a0 JW |
6865 | int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, |
6866 | void __user *buffer, size_t *length, loff_t *ppos) | |
6867 | { | |
6868 | int rc; | |
6869 | ||
6870 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
6871 | if (rc) | |
6872 | return rc; | |
6873 | ||
6874 | if (write) | |
6875 | setup_per_zone_wmarks(); | |
6876 | ||
6877 | return 0; | |
6878 | } | |
6879 | ||
9614634f | 6880 | #ifdef CONFIG_NUMA |
cccad5b9 | 6881 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6882 | void __user *buffer, size_t *length, loff_t *ppos) |
9614634f | 6883 | { |
a5f5f91d | 6884 | struct pglist_data *pgdat; |
9614634f CL |
6885 | struct zone *zone; |
6886 | int rc; | |
6887 | ||
8d65af78 | 6888 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
9614634f CL |
6889 | if (rc) |
6890 | return rc; | |
6891 | ||
a5f5f91d MG |
6892 | for_each_online_pgdat(pgdat) |
6893 | pgdat->min_slab_pages = 0; | |
6894 | ||
9614634f | 6895 | for_each_zone(zone) |
a5f5f91d | 6896 | zone->zone_pgdat->min_unmapped_pages += (zone->managed_pages * |
9614634f CL |
6897 | sysctl_min_unmapped_ratio) / 100; |
6898 | return 0; | |
6899 | } | |
0ff38490 | 6900 | |
cccad5b9 | 6901 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6902 | void __user *buffer, size_t *length, loff_t *ppos) |
0ff38490 | 6903 | { |
a5f5f91d | 6904 | struct pglist_data *pgdat; |
0ff38490 CL |
6905 | struct zone *zone; |
6906 | int rc; | |
6907 | ||
8d65af78 | 6908 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
0ff38490 CL |
6909 | if (rc) |
6910 | return rc; | |
6911 | ||
a5f5f91d MG |
6912 | for_each_online_pgdat(pgdat) |
6913 | pgdat->min_slab_pages = 0; | |
6914 | ||
0ff38490 | 6915 | for_each_zone(zone) |
a5f5f91d | 6916 | zone->zone_pgdat->min_slab_pages += (zone->managed_pages * |
0ff38490 CL |
6917 | sysctl_min_slab_ratio) / 100; |
6918 | return 0; | |
6919 | } | |
9614634f CL |
6920 | #endif |
6921 | ||
1da177e4 LT |
6922 | /* |
6923 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
6924 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
6925 | * whenever sysctl_lowmem_reserve_ratio changes. | |
6926 | * | |
6927 | * The reserve ratio obviously has absolutely no relation with the | |
41858966 | 6928 | * minimum watermarks. The lowmem reserve ratio can only make sense |
1da177e4 LT |
6929 | * if in function of the boot time zone sizes. |
6930 | */ | |
cccad5b9 | 6931 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6932 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 6933 | { |
8d65af78 | 6934 | proc_dointvec_minmax(table, write, buffer, length, ppos); |
1da177e4 LT |
6935 | setup_per_zone_lowmem_reserve(); |
6936 | return 0; | |
6937 | } | |
6938 | ||
8ad4b1fb RS |
6939 | /* |
6940 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
b8af2941 PK |
6941 | * cpu. It is the fraction of total pages in each zone that a hot per cpu |
6942 | * pagelist can have before it gets flushed back to buddy allocator. | |
8ad4b1fb | 6943 | */ |
cccad5b9 | 6944 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write, |
8d65af78 | 6945 | void __user *buffer, size_t *length, loff_t *ppos) |
8ad4b1fb RS |
6946 | { |
6947 | struct zone *zone; | |
7cd2b0a3 | 6948 | int old_percpu_pagelist_fraction; |
8ad4b1fb RS |
6949 | int ret; |
6950 | ||
7cd2b0a3 DR |
6951 | mutex_lock(&pcp_batch_high_lock); |
6952 | old_percpu_pagelist_fraction = percpu_pagelist_fraction; | |
6953 | ||
8d65af78 | 6954 | ret = proc_dointvec_minmax(table, write, buffer, length, ppos); |
7cd2b0a3 DR |
6955 | if (!write || ret < 0) |
6956 | goto out; | |
6957 | ||
6958 | /* Sanity checking to avoid pcp imbalance */ | |
6959 | if (percpu_pagelist_fraction && | |
6960 | percpu_pagelist_fraction < MIN_PERCPU_PAGELIST_FRACTION) { | |
6961 | percpu_pagelist_fraction = old_percpu_pagelist_fraction; | |
6962 | ret = -EINVAL; | |
6963 | goto out; | |
6964 | } | |
6965 | ||
6966 | /* No change? */ | |
6967 | if (percpu_pagelist_fraction == old_percpu_pagelist_fraction) | |
6968 | goto out; | |
c8e251fa | 6969 | |
364df0eb | 6970 | for_each_populated_zone(zone) { |
7cd2b0a3 DR |
6971 | unsigned int cpu; |
6972 | ||
22a7f12b | 6973 | for_each_possible_cpu(cpu) |
7cd2b0a3 DR |
6974 | pageset_set_high_and_batch(zone, |
6975 | per_cpu_ptr(zone->pageset, cpu)); | |
8ad4b1fb | 6976 | } |
7cd2b0a3 | 6977 | out: |
c8e251fa | 6978 | mutex_unlock(&pcp_batch_high_lock); |
7cd2b0a3 | 6979 | return ret; |
8ad4b1fb RS |
6980 | } |
6981 | ||
a9919c79 | 6982 | #ifdef CONFIG_NUMA |
f034b5d4 | 6983 | int hashdist = HASHDIST_DEFAULT; |
1da177e4 | 6984 | |
1da177e4 LT |
6985 | static int __init set_hashdist(char *str) |
6986 | { | |
6987 | if (!str) | |
6988 | return 0; | |
6989 | hashdist = simple_strtoul(str, &str, 0); | |
6990 | return 1; | |
6991 | } | |
6992 | __setup("hashdist=", set_hashdist); | |
6993 | #endif | |
6994 | ||
6995 | /* | |
6996 | * allocate a large system hash table from bootmem | |
6997 | * - it is assumed that the hash table must contain an exact power-of-2 | |
6998 | * quantity of entries | |
6999 | * - limit is the number of hash buckets, not the total allocation size | |
7000 | */ | |
7001 | void *__init alloc_large_system_hash(const char *tablename, | |
7002 | unsigned long bucketsize, | |
7003 | unsigned long numentries, | |
7004 | int scale, | |
7005 | int flags, | |
7006 | unsigned int *_hash_shift, | |
7007 | unsigned int *_hash_mask, | |
31fe62b9 TB |
7008 | unsigned long low_limit, |
7009 | unsigned long high_limit) | |
1da177e4 | 7010 | { |
31fe62b9 | 7011 | unsigned long long max = high_limit; |
1da177e4 LT |
7012 | unsigned long log2qty, size; |
7013 | void *table = NULL; | |
7014 | ||
7015 | /* allow the kernel cmdline to have a say */ | |
7016 | if (!numentries) { | |
7017 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 7018 | numentries = nr_kernel_pages; |
a7e83318 JZ |
7019 | |
7020 | /* It isn't necessary when PAGE_SIZE >= 1MB */ | |
7021 | if (PAGE_SHIFT < 20) | |
7022 | numentries = round_up(numentries, (1<<20)/PAGE_SIZE); | |
1da177e4 LT |
7023 | |
7024 | /* limit to 1 bucket per 2^scale bytes of low memory */ | |
7025 | if (scale > PAGE_SHIFT) | |
7026 | numentries >>= (scale - PAGE_SHIFT); | |
7027 | else | |
7028 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
7029 | |
7030 | /* Make sure we've got at least a 0-order allocation.. */ | |
2c85f51d JB |
7031 | if (unlikely(flags & HASH_SMALL)) { |
7032 | /* Makes no sense without HASH_EARLY */ | |
7033 | WARN_ON(!(flags & HASH_EARLY)); | |
7034 | if (!(numentries >> *_hash_shift)) { | |
7035 | numentries = 1UL << *_hash_shift; | |
7036 | BUG_ON(!numentries); | |
7037 | } | |
7038 | } else if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
9ab37b8f | 7039 | numentries = PAGE_SIZE / bucketsize; |
1da177e4 | 7040 | } |
6e692ed3 | 7041 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
7042 | |
7043 | /* limit allocation size to 1/16 total memory by default */ | |
7044 | if (max == 0) { | |
7045 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
7046 | do_div(max, bucketsize); | |
7047 | } | |
074b8517 | 7048 | max = min(max, 0x80000000ULL); |
1da177e4 | 7049 | |
31fe62b9 TB |
7050 | if (numentries < low_limit) |
7051 | numentries = low_limit; | |
1da177e4 LT |
7052 | if (numentries > max) |
7053 | numentries = max; | |
7054 | ||
f0d1b0b3 | 7055 | log2qty = ilog2(numentries); |
1da177e4 LT |
7056 | |
7057 | do { | |
7058 | size = bucketsize << log2qty; | |
7059 | if (flags & HASH_EARLY) | |
6782832e | 7060 | table = memblock_virt_alloc_nopanic(size, 0); |
1da177e4 LT |
7061 | else if (hashdist) |
7062 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); | |
7063 | else { | |
1037b83b ED |
7064 | /* |
7065 | * If bucketsize is not a power-of-two, we may free | |
a1dd268c MG |
7066 | * some pages at the end of hash table which |
7067 | * alloc_pages_exact() automatically does | |
1037b83b | 7068 | */ |
264ef8a9 | 7069 | if (get_order(size) < MAX_ORDER) { |
a1dd268c | 7070 | table = alloc_pages_exact(size, GFP_ATOMIC); |
264ef8a9 CM |
7071 | kmemleak_alloc(table, size, 1, GFP_ATOMIC); |
7072 | } | |
1da177e4 LT |
7073 | } |
7074 | } while (!table && size > PAGE_SIZE && --log2qty); | |
7075 | ||
7076 | if (!table) | |
7077 | panic("Failed to allocate %s hash table\n", tablename); | |
7078 | ||
1170532b JP |
7079 | pr_info("%s hash table entries: %ld (order: %d, %lu bytes)\n", |
7080 | tablename, 1UL << log2qty, ilog2(size) - PAGE_SHIFT, size); | |
1da177e4 LT |
7081 | |
7082 | if (_hash_shift) | |
7083 | *_hash_shift = log2qty; | |
7084 | if (_hash_mask) | |
7085 | *_hash_mask = (1 << log2qty) - 1; | |
7086 | ||
7087 | return table; | |
7088 | } | |
a117e66e | 7089 | |
a5d76b54 | 7090 | /* |
80934513 MK |
7091 | * This function checks whether pageblock includes unmovable pages or not. |
7092 | * If @count is not zero, it is okay to include less @count unmovable pages | |
7093 | * | |
b8af2941 | 7094 | * PageLRU check without isolation or lru_lock could race so that |
80934513 MK |
7095 | * MIGRATE_MOVABLE block might include unmovable pages. It means you can't |
7096 | * expect this function should be exact. | |
a5d76b54 | 7097 | */ |
b023f468 WC |
7098 | bool has_unmovable_pages(struct zone *zone, struct page *page, int count, |
7099 | bool skip_hwpoisoned_pages) | |
49ac8255 KH |
7100 | { |
7101 | unsigned long pfn, iter, found; | |
47118af0 MN |
7102 | int mt; |
7103 | ||
49ac8255 KH |
7104 | /* |
7105 | * For avoiding noise data, lru_add_drain_all() should be called | |
80934513 | 7106 | * If ZONE_MOVABLE, the zone never contains unmovable pages |
49ac8255 KH |
7107 | */ |
7108 | if (zone_idx(zone) == ZONE_MOVABLE) | |
80934513 | 7109 | return false; |
47118af0 MN |
7110 | mt = get_pageblock_migratetype(page); |
7111 | if (mt == MIGRATE_MOVABLE || is_migrate_cma(mt)) | |
80934513 | 7112 | return false; |
49ac8255 KH |
7113 | |
7114 | pfn = page_to_pfn(page); | |
7115 | for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) { | |
7116 | unsigned long check = pfn + iter; | |
7117 | ||
29723fcc | 7118 | if (!pfn_valid_within(check)) |
49ac8255 | 7119 | continue; |
29723fcc | 7120 | |
49ac8255 | 7121 | page = pfn_to_page(check); |
c8721bbb NH |
7122 | |
7123 | /* | |
7124 | * Hugepages are not in LRU lists, but they're movable. | |
7125 | * We need not scan over tail pages bacause we don't | |
7126 | * handle each tail page individually in migration. | |
7127 | */ | |
7128 | if (PageHuge(page)) { | |
7129 | iter = round_up(iter + 1, 1<<compound_order(page)) - 1; | |
7130 | continue; | |
7131 | } | |
7132 | ||
97d255c8 MK |
7133 | /* |
7134 | * We can't use page_count without pin a page | |
7135 | * because another CPU can free compound page. | |
7136 | * This check already skips compound tails of THP | |
0139aa7b | 7137 | * because their page->_refcount is zero at all time. |
97d255c8 | 7138 | */ |
fe896d18 | 7139 | if (!page_ref_count(page)) { |
49ac8255 KH |
7140 | if (PageBuddy(page)) |
7141 | iter += (1 << page_order(page)) - 1; | |
7142 | continue; | |
7143 | } | |
97d255c8 | 7144 | |
b023f468 WC |
7145 | /* |
7146 | * The HWPoisoned page may be not in buddy system, and | |
7147 | * page_count() is not 0. | |
7148 | */ | |
7149 | if (skip_hwpoisoned_pages && PageHWPoison(page)) | |
7150 | continue; | |
7151 | ||
49ac8255 KH |
7152 | if (!PageLRU(page)) |
7153 | found++; | |
7154 | /* | |
6b4f7799 JW |
7155 | * If there are RECLAIMABLE pages, we need to check |
7156 | * it. But now, memory offline itself doesn't call | |
7157 | * shrink_node_slabs() and it still to be fixed. | |
49ac8255 KH |
7158 | */ |
7159 | /* | |
7160 | * If the page is not RAM, page_count()should be 0. | |
7161 | * we don't need more check. This is an _used_ not-movable page. | |
7162 | * | |
7163 | * The problematic thing here is PG_reserved pages. PG_reserved | |
7164 | * is set to both of a memory hole page and a _used_ kernel | |
7165 | * page at boot. | |
7166 | */ | |
7167 | if (found > count) | |
80934513 | 7168 | return true; |
49ac8255 | 7169 | } |
80934513 | 7170 | return false; |
49ac8255 KH |
7171 | } |
7172 | ||
7173 | bool is_pageblock_removable_nolock(struct page *page) | |
7174 | { | |
656a0706 MH |
7175 | struct zone *zone; |
7176 | unsigned long pfn; | |
687875fb MH |
7177 | |
7178 | /* | |
7179 | * We have to be careful here because we are iterating over memory | |
7180 | * sections which are not zone aware so we might end up outside of | |
7181 | * the zone but still within the section. | |
656a0706 MH |
7182 | * We have to take care about the node as well. If the node is offline |
7183 | * its NODE_DATA will be NULL - see page_zone. | |
687875fb | 7184 | */ |
656a0706 MH |
7185 | if (!node_online(page_to_nid(page))) |
7186 | return false; | |
7187 | ||
7188 | zone = page_zone(page); | |
7189 | pfn = page_to_pfn(page); | |
108bcc96 | 7190 | if (!zone_spans_pfn(zone, pfn)) |
687875fb MH |
7191 | return false; |
7192 | ||
b023f468 | 7193 | return !has_unmovable_pages(zone, page, 0, true); |
a5d76b54 | 7194 | } |
0c0e6195 | 7195 | |
080fe206 | 7196 | #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA) |
041d3a8c MN |
7197 | |
7198 | static unsigned long pfn_max_align_down(unsigned long pfn) | |
7199 | { | |
7200 | return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
7201 | pageblock_nr_pages) - 1); | |
7202 | } | |
7203 | ||
7204 | static unsigned long pfn_max_align_up(unsigned long pfn) | |
7205 | { | |
7206 | return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
7207 | pageblock_nr_pages)); | |
7208 | } | |
7209 | ||
041d3a8c | 7210 | /* [start, end) must belong to a single zone. */ |
bb13ffeb MG |
7211 | static int __alloc_contig_migrate_range(struct compact_control *cc, |
7212 | unsigned long start, unsigned long end) | |
041d3a8c MN |
7213 | { |
7214 | /* This function is based on compact_zone() from compaction.c. */ | |
beb51eaa | 7215 | unsigned long nr_reclaimed; |
041d3a8c MN |
7216 | unsigned long pfn = start; |
7217 | unsigned int tries = 0; | |
7218 | int ret = 0; | |
7219 | ||
be49a6e1 | 7220 | migrate_prep(); |
041d3a8c | 7221 | |
bb13ffeb | 7222 | while (pfn < end || !list_empty(&cc->migratepages)) { |
041d3a8c MN |
7223 | if (fatal_signal_pending(current)) { |
7224 | ret = -EINTR; | |
7225 | break; | |
7226 | } | |
7227 | ||
bb13ffeb MG |
7228 | if (list_empty(&cc->migratepages)) { |
7229 | cc->nr_migratepages = 0; | |
edc2ca61 | 7230 | pfn = isolate_migratepages_range(cc, pfn, end); |
041d3a8c MN |
7231 | if (!pfn) { |
7232 | ret = -EINTR; | |
7233 | break; | |
7234 | } | |
7235 | tries = 0; | |
7236 | } else if (++tries == 5) { | |
7237 | ret = ret < 0 ? ret : -EBUSY; | |
7238 | break; | |
7239 | } | |
7240 | ||
beb51eaa MK |
7241 | nr_reclaimed = reclaim_clean_pages_from_list(cc->zone, |
7242 | &cc->migratepages); | |
7243 | cc->nr_migratepages -= nr_reclaimed; | |
02c6de8d | 7244 | |
9c620e2b | 7245 | ret = migrate_pages(&cc->migratepages, alloc_migrate_target, |
e0b9daeb | 7246 | NULL, 0, cc->mode, MR_CMA); |
041d3a8c | 7247 | } |
2a6f5124 SP |
7248 | if (ret < 0) { |
7249 | putback_movable_pages(&cc->migratepages); | |
7250 | return ret; | |
7251 | } | |
7252 | return 0; | |
041d3a8c MN |
7253 | } |
7254 | ||
7255 | /** | |
7256 | * alloc_contig_range() -- tries to allocate given range of pages | |
7257 | * @start: start PFN to allocate | |
7258 | * @end: one-past-the-last PFN to allocate | |
0815f3d8 MN |
7259 | * @migratetype: migratetype of the underlaying pageblocks (either |
7260 | * #MIGRATE_MOVABLE or #MIGRATE_CMA). All pageblocks | |
7261 | * in range must have the same migratetype and it must | |
7262 | * be either of the two. | |
041d3a8c MN |
7263 | * |
7264 | * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES | |
7265 | * aligned, however it's the caller's responsibility to guarantee that | |
7266 | * we are the only thread that changes migrate type of pageblocks the | |
7267 | * pages fall in. | |
7268 | * | |
7269 | * The PFN range must belong to a single zone. | |
7270 | * | |
7271 | * Returns zero on success or negative error code. On success all | |
7272 | * pages which PFN is in [start, end) are allocated for the caller and | |
7273 | * need to be freed with free_contig_range(). | |
7274 | */ | |
0815f3d8 MN |
7275 | int alloc_contig_range(unsigned long start, unsigned long end, |
7276 | unsigned migratetype) | |
041d3a8c | 7277 | { |
041d3a8c | 7278 | unsigned long outer_start, outer_end; |
d00181b9 KS |
7279 | unsigned int order; |
7280 | int ret = 0; | |
041d3a8c | 7281 | |
bb13ffeb MG |
7282 | struct compact_control cc = { |
7283 | .nr_migratepages = 0, | |
7284 | .order = -1, | |
7285 | .zone = page_zone(pfn_to_page(start)), | |
e0b9daeb | 7286 | .mode = MIGRATE_SYNC, |
bb13ffeb MG |
7287 | .ignore_skip_hint = true, |
7288 | }; | |
7289 | INIT_LIST_HEAD(&cc.migratepages); | |
7290 | ||
041d3a8c MN |
7291 | /* |
7292 | * What we do here is we mark all pageblocks in range as | |
7293 | * MIGRATE_ISOLATE. Because pageblock and max order pages may | |
7294 | * have different sizes, and due to the way page allocator | |
7295 | * work, we align the range to biggest of the two pages so | |
7296 | * that page allocator won't try to merge buddies from | |
7297 | * different pageblocks and change MIGRATE_ISOLATE to some | |
7298 | * other migration type. | |
7299 | * | |
7300 | * Once the pageblocks are marked as MIGRATE_ISOLATE, we | |
7301 | * migrate the pages from an unaligned range (ie. pages that | |
7302 | * we are interested in). This will put all the pages in | |
7303 | * range back to page allocator as MIGRATE_ISOLATE. | |
7304 | * | |
7305 | * When this is done, we take the pages in range from page | |
7306 | * allocator removing them from the buddy system. This way | |
7307 | * page allocator will never consider using them. | |
7308 | * | |
7309 | * This lets us mark the pageblocks back as | |
7310 | * MIGRATE_CMA/MIGRATE_MOVABLE so that free pages in the | |
7311 | * aligned range but not in the unaligned, original range are | |
7312 | * put back to page allocator so that buddy can use them. | |
7313 | */ | |
7314 | ||
7315 | ret = start_isolate_page_range(pfn_max_align_down(start), | |
b023f468 WC |
7316 | pfn_max_align_up(end), migratetype, |
7317 | false); | |
041d3a8c | 7318 | if (ret) |
86a595f9 | 7319 | return ret; |
041d3a8c | 7320 | |
8ef5849f JK |
7321 | /* |
7322 | * In case of -EBUSY, we'd like to know which page causes problem. | |
7323 | * So, just fall through. We will check it in test_pages_isolated(). | |
7324 | */ | |
bb13ffeb | 7325 | ret = __alloc_contig_migrate_range(&cc, start, end); |
8ef5849f | 7326 | if (ret && ret != -EBUSY) |
041d3a8c MN |
7327 | goto done; |
7328 | ||
7329 | /* | |
7330 | * Pages from [start, end) are within a MAX_ORDER_NR_PAGES | |
7331 | * aligned blocks that are marked as MIGRATE_ISOLATE. What's | |
7332 | * more, all pages in [start, end) are free in page allocator. | |
7333 | * What we are going to do is to allocate all pages from | |
7334 | * [start, end) (that is remove them from page allocator). | |
7335 | * | |
7336 | * The only problem is that pages at the beginning and at the | |
7337 | * end of interesting range may be not aligned with pages that | |
7338 | * page allocator holds, ie. they can be part of higher order | |
7339 | * pages. Because of this, we reserve the bigger range and | |
7340 | * once this is done free the pages we are not interested in. | |
7341 | * | |
7342 | * We don't have to hold zone->lock here because the pages are | |
7343 | * isolated thus they won't get removed from buddy. | |
7344 | */ | |
7345 | ||
7346 | lru_add_drain_all(); | |
510f5507 | 7347 | drain_all_pages(cc.zone); |
041d3a8c MN |
7348 | |
7349 | order = 0; | |
7350 | outer_start = start; | |
7351 | while (!PageBuddy(pfn_to_page(outer_start))) { | |
7352 | if (++order >= MAX_ORDER) { | |
8ef5849f JK |
7353 | outer_start = start; |
7354 | break; | |
041d3a8c MN |
7355 | } |
7356 | outer_start &= ~0UL << order; | |
7357 | } | |
7358 | ||
8ef5849f JK |
7359 | if (outer_start != start) { |
7360 | order = page_order(pfn_to_page(outer_start)); | |
7361 | ||
7362 | /* | |
7363 | * outer_start page could be small order buddy page and | |
7364 | * it doesn't include start page. Adjust outer_start | |
7365 | * in this case to report failed page properly | |
7366 | * on tracepoint in test_pages_isolated() | |
7367 | */ | |
7368 | if (outer_start + (1UL << order) <= start) | |
7369 | outer_start = start; | |
7370 | } | |
7371 | ||
041d3a8c | 7372 | /* Make sure the range is really isolated. */ |
b023f468 | 7373 | if (test_pages_isolated(outer_start, end, false)) { |
dae803e1 MN |
7374 | pr_info("%s: [%lx, %lx) PFNs busy\n", |
7375 | __func__, outer_start, end); | |
041d3a8c MN |
7376 | ret = -EBUSY; |
7377 | goto done; | |
7378 | } | |
7379 | ||
49f223a9 | 7380 | /* Grab isolated pages from freelists. */ |
bb13ffeb | 7381 | outer_end = isolate_freepages_range(&cc, outer_start, end); |
041d3a8c MN |
7382 | if (!outer_end) { |
7383 | ret = -EBUSY; | |
7384 | goto done; | |
7385 | } | |
7386 | ||
7387 | /* Free head and tail (if any) */ | |
7388 | if (start != outer_start) | |
7389 | free_contig_range(outer_start, start - outer_start); | |
7390 | if (end != outer_end) | |
7391 | free_contig_range(end, outer_end - end); | |
7392 | ||
7393 | done: | |
7394 | undo_isolate_page_range(pfn_max_align_down(start), | |
0815f3d8 | 7395 | pfn_max_align_up(end), migratetype); |
041d3a8c MN |
7396 | return ret; |
7397 | } | |
7398 | ||
7399 | void free_contig_range(unsigned long pfn, unsigned nr_pages) | |
7400 | { | |
bcc2b02f MS |
7401 | unsigned int count = 0; |
7402 | ||
7403 | for (; nr_pages--; pfn++) { | |
7404 | struct page *page = pfn_to_page(pfn); | |
7405 | ||
7406 | count += page_count(page) != 1; | |
7407 | __free_page(page); | |
7408 | } | |
7409 | WARN(count != 0, "%d pages are still in use!\n", count); | |
041d3a8c MN |
7410 | } |
7411 | #endif | |
7412 | ||
4ed7e022 | 7413 | #ifdef CONFIG_MEMORY_HOTPLUG |
0a647f38 CS |
7414 | /* |
7415 | * The zone indicated has a new number of managed_pages; batch sizes and percpu | |
7416 | * page high values need to be recalulated. | |
7417 | */ | |
4ed7e022 JL |
7418 | void __meminit zone_pcp_update(struct zone *zone) |
7419 | { | |
0a647f38 | 7420 | unsigned cpu; |
c8e251fa | 7421 | mutex_lock(&pcp_batch_high_lock); |
0a647f38 | 7422 | for_each_possible_cpu(cpu) |
169f6c19 CS |
7423 | pageset_set_high_and_batch(zone, |
7424 | per_cpu_ptr(zone->pageset, cpu)); | |
c8e251fa | 7425 | mutex_unlock(&pcp_batch_high_lock); |
4ed7e022 JL |
7426 | } |
7427 | #endif | |
7428 | ||
340175b7 JL |
7429 | void zone_pcp_reset(struct zone *zone) |
7430 | { | |
7431 | unsigned long flags; | |
5a883813 MK |
7432 | int cpu; |
7433 | struct per_cpu_pageset *pset; | |
340175b7 JL |
7434 | |
7435 | /* avoid races with drain_pages() */ | |
7436 | local_irq_save(flags); | |
7437 | if (zone->pageset != &boot_pageset) { | |
5a883813 MK |
7438 | for_each_online_cpu(cpu) { |
7439 | pset = per_cpu_ptr(zone->pageset, cpu); | |
7440 | drain_zonestat(zone, pset); | |
7441 | } | |
340175b7 JL |
7442 | free_percpu(zone->pageset); |
7443 | zone->pageset = &boot_pageset; | |
7444 | } | |
7445 | local_irq_restore(flags); | |
7446 | } | |
7447 | ||
6dcd73d7 | 7448 | #ifdef CONFIG_MEMORY_HOTREMOVE |
0c0e6195 | 7449 | /* |
b9eb6319 JK |
7450 | * All pages in the range must be in a single zone and isolated |
7451 | * before calling this. | |
0c0e6195 KH |
7452 | */ |
7453 | void | |
7454 | __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
7455 | { | |
7456 | struct page *page; | |
7457 | struct zone *zone; | |
7aeb09f9 | 7458 | unsigned int order, i; |
0c0e6195 KH |
7459 | unsigned long pfn; |
7460 | unsigned long flags; | |
7461 | /* find the first valid pfn */ | |
7462 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
7463 | if (pfn_valid(pfn)) | |
7464 | break; | |
7465 | if (pfn == end_pfn) | |
7466 | return; | |
7467 | zone = page_zone(pfn_to_page(pfn)); | |
7468 | spin_lock_irqsave(&zone->lock, flags); | |
7469 | pfn = start_pfn; | |
7470 | while (pfn < end_pfn) { | |
7471 | if (!pfn_valid(pfn)) { | |
7472 | pfn++; | |
7473 | continue; | |
7474 | } | |
7475 | page = pfn_to_page(pfn); | |
b023f468 WC |
7476 | /* |
7477 | * The HWPoisoned page may be not in buddy system, and | |
7478 | * page_count() is not 0. | |
7479 | */ | |
7480 | if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { | |
7481 | pfn++; | |
7482 | SetPageReserved(page); | |
7483 | continue; | |
7484 | } | |
7485 | ||
0c0e6195 KH |
7486 | BUG_ON(page_count(page)); |
7487 | BUG_ON(!PageBuddy(page)); | |
7488 | order = page_order(page); | |
7489 | #ifdef CONFIG_DEBUG_VM | |
1170532b JP |
7490 | pr_info("remove from free list %lx %d %lx\n", |
7491 | pfn, 1 << order, end_pfn); | |
0c0e6195 KH |
7492 | #endif |
7493 | list_del(&page->lru); | |
7494 | rmv_page_order(page); | |
7495 | zone->free_area[order].nr_free--; | |
0c0e6195 KH |
7496 | for (i = 0; i < (1 << order); i++) |
7497 | SetPageReserved((page+i)); | |
7498 | pfn += (1 << order); | |
7499 | } | |
7500 | spin_unlock_irqrestore(&zone->lock, flags); | |
7501 | } | |
7502 | #endif | |
8d22ba1b | 7503 | |
8d22ba1b WF |
7504 | bool is_free_buddy_page(struct page *page) |
7505 | { | |
7506 | struct zone *zone = page_zone(page); | |
7507 | unsigned long pfn = page_to_pfn(page); | |
7508 | unsigned long flags; | |
7aeb09f9 | 7509 | unsigned int order; |
8d22ba1b WF |
7510 | |
7511 | spin_lock_irqsave(&zone->lock, flags); | |
7512 | for (order = 0; order < MAX_ORDER; order++) { | |
7513 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
7514 | ||
7515 | if (PageBuddy(page_head) && page_order(page_head) >= order) | |
7516 | break; | |
7517 | } | |
7518 | spin_unlock_irqrestore(&zone->lock, flags); | |
7519 | ||
7520 | return order < MAX_ORDER; | |
7521 | } |