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> | |
22 | #include <linux/bootmem.h> | |
23 | #include <linux/compiler.h> | |
9f158333 | 24 | #include <linux/kernel.h> |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/suspend.h> | |
27 | #include <linux/pagevec.h> | |
28 | #include <linux/blkdev.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/notifier.h> | |
31 | #include <linux/topology.h> | |
32 | #include <linux/sysctl.h> | |
33 | #include <linux/cpu.h> | |
34 | #include <linux/cpuset.h> | |
bdc8cb98 | 35 | #include <linux/memory_hotplug.h> |
1da177e4 LT |
36 | #include <linux/nodemask.h> |
37 | #include <linux/vmalloc.h> | |
4be38e35 | 38 | #include <linux/mempolicy.h> |
6811378e | 39 | #include <linux/stop_machine.h> |
c713216d MG |
40 | #include <linux/sort.h> |
41 | #include <linux/pfn.h> | |
3fcfab16 | 42 | #include <linux/backing-dev.h> |
933e312e | 43 | #include <linux/fault-inject.h> |
a5d76b54 | 44 | #include <linux/page-isolation.h> |
1da177e4 LT |
45 | |
46 | #include <asm/tlbflush.h> | |
ac924c60 | 47 | #include <asm/div64.h> |
1da177e4 LT |
48 | #include "internal.h" |
49 | ||
50 | /* | |
13808910 | 51 | * Array of node states. |
1da177e4 | 52 | */ |
13808910 CL |
53 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
54 | [N_POSSIBLE] = NODE_MASK_ALL, | |
55 | [N_ONLINE] = { { [0] = 1UL } }, | |
56 | #ifndef CONFIG_NUMA | |
57 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
58 | #ifdef CONFIG_HIGHMEM | |
59 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
60 | #endif | |
61 | [N_CPU] = { { [0] = 1UL } }, | |
62 | #endif /* NUMA */ | |
63 | }; | |
64 | EXPORT_SYMBOL(node_states); | |
65 | ||
6c231b7b | 66 | unsigned long totalram_pages __read_mostly; |
cb45b0e9 | 67 | unsigned long totalreserve_pages __read_mostly; |
1da177e4 | 68 | long nr_swap_pages; |
8ad4b1fb | 69 | int percpu_pagelist_fraction; |
1da177e4 | 70 | |
d9c23400 MG |
71 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
72 | int pageblock_order __read_mostly; | |
73 | #endif | |
74 | ||
d98c7a09 | 75 | static void __free_pages_ok(struct page *page, unsigned int order); |
a226f6c8 | 76 | |
1da177e4 LT |
77 | /* |
78 | * results with 256, 32 in the lowmem_reserve sysctl: | |
79 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
80 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
81 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
82 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
83 | * HIGHMEM allocation will (224M+784M)/256 of ram reserved in ZONE_DMA | |
a2f1b424 AK |
84 | * |
85 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
86 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 87 | */ |
2f1b6248 | 88 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { |
4b51d669 | 89 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 90 | 256, |
4b51d669 | 91 | #endif |
fb0e7942 | 92 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 93 | 256, |
fb0e7942 | 94 | #endif |
e53ef38d | 95 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 96 | 32, |
e53ef38d | 97 | #endif |
2a1e274a | 98 | 32, |
2f1b6248 | 99 | }; |
1da177e4 LT |
100 | |
101 | EXPORT_SYMBOL(totalram_pages); | |
1da177e4 | 102 | |
15ad7cdc | 103 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 104 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 105 | "DMA", |
4b51d669 | 106 | #endif |
fb0e7942 | 107 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 108 | "DMA32", |
fb0e7942 | 109 | #endif |
2f1b6248 | 110 | "Normal", |
e53ef38d | 111 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 112 | "HighMem", |
e53ef38d | 113 | #endif |
2a1e274a | 114 | "Movable", |
2f1b6248 CL |
115 | }; |
116 | ||
1da177e4 LT |
117 | int min_free_kbytes = 1024; |
118 | ||
86356ab1 YG |
119 | unsigned long __meminitdata nr_kernel_pages; |
120 | unsigned long __meminitdata nr_all_pages; | |
a3142c8e | 121 | static unsigned long __meminitdata dma_reserve; |
1da177e4 | 122 | |
c713216d MG |
123 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
124 | /* | |
125 | * MAX_ACTIVE_REGIONS determines the maxmimum number of distinct | |
126 | * ranges of memory (RAM) that may be registered with add_active_range(). | |
127 | * Ranges passed to add_active_range() will be merged if possible | |
128 | * so the number of times add_active_range() can be called is | |
129 | * related to the number of nodes and the number of holes | |
130 | */ | |
131 | #ifdef CONFIG_MAX_ACTIVE_REGIONS | |
132 | /* Allow an architecture to set MAX_ACTIVE_REGIONS to save memory */ | |
133 | #define MAX_ACTIVE_REGIONS CONFIG_MAX_ACTIVE_REGIONS | |
134 | #else | |
135 | #if MAX_NUMNODES >= 32 | |
136 | /* If there can be many nodes, allow up to 50 holes per node */ | |
137 | #define MAX_ACTIVE_REGIONS (MAX_NUMNODES*50) | |
138 | #else | |
139 | /* By default, allow up to 256 distinct regions */ | |
140 | #define MAX_ACTIVE_REGIONS 256 | |
141 | #endif | |
142 | #endif | |
143 | ||
98011f56 JB |
144 | static struct node_active_region __meminitdata early_node_map[MAX_ACTIVE_REGIONS]; |
145 | static int __meminitdata nr_nodemap_entries; | |
146 | static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES]; | |
147 | static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; | |
fb01439c | 148 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE |
98011f56 JB |
149 | static unsigned long __meminitdata node_boundary_start_pfn[MAX_NUMNODES]; |
150 | static unsigned long __meminitdata node_boundary_end_pfn[MAX_NUMNODES]; | |
fb01439c | 151 | #endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */ |
2a1e274a | 152 | unsigned long __initdata required_kernelcore; |
484f51f8 | 153 | static unsigned long __initdata required_movablecore; |
e228929b | 154 | unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; |
2a1e274a MG |
155 | |
156 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
157 | int movable_zone; | |
158 | EXPORT_SYMBOL(movable_zone); | |
c713216d MG |
159 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
160 | ||
418508c1 MS |
161 | #if MAX_NUMNODES > 1 |
162 | int nr_node_ids __read_mostly = MAX_NUMNODES; | |
163 | EXPORT_SYMBOL(nr_node_ids); | |
164 | #endif | |
165 | ||
9ef9acb0 MG |
166 | int page_group_by_mobility_disabled __read_mostly; |
167 | ||
b2a0ac88 MG |
168 | static void set_pageblock_migratetype(struct page *page, int migratetype) |
169 | { | |
170 | set_pageblock_flags_group(page, (unsigned long)migratetype, | |
171 | PB_migrate, PB_migrate_end); | |
172 | } | |
173 | ||
13e7444b | 174 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 175 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 176 | { |
bdc8cb98 DH |
177 | int ret = 0; |
178 | unsigned seq; | |
179 | unsigned long pfn = page_to_pfn(page); | |
c6a57e19 | 180 | |
bdc8cb98 DH |
181 | do { |
182 | seq = zone_span_seqbegin(zone); | |
183 | if (pfn >= zone->zone_start_pfn + zone->spanned_pages) | |
184 | ret = 1; | |
185 | else if (pfn < zone->zone_start_pfn) | |
186 | ret = 1; | |
187 | } while (zone_span_seqretry(zone, seq)); | |
188 | ||
189 | return ret; | |
c6a57e19 DH |
190 | } |
191 | ||
192 | static int page_is_consistent(struct zone *zone, struct page *page) | |
193 | { | |
14e07298 | 194 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 195 | return 0; |
1da177e4 | 196 | if (zone != page_zone(page)) |
c6a57e19 DH |
197 | return 0; |
198 | ||
199 | return 1; | |
200 | } | |
201 | /* | |
202 | * Temporary debugging check for pages not lying within a given zone. | |
203 | */ | |
204 | static int bad_range(struct zone *zone, struct page *page) | |
205 | { | |
206 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 207 | return 1; |
c6a57e19 DH |
208 | if (!page_is_consistent(zone, page)) |
209 | return 1; | |
210 | ||
1da177e4 LT |
211 | return 0; |
212 | } | |
13e7444b NP |
213 | #else |
214 | static inline int bad_range(struct zone *zone, struct page *page) | |
215 | { | |
216 | return 0; | |
217 | } | |
218 | #endif | |
219 | ||
224abf92 | 220 | static void bad_page(struct page *page) |
1da177e4 | 221 | { |
224abf92 | 222 | printk(KERN_EMERG "Bad page state in process '%s'\n" |
7365f3d1 HD |
223 | KERN_EMERG "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n" |
224 | KERN_EMERG "Trying to fix it up, but a reboot is needed\n" | |
225 | KERN_EMERG "Backtrace:\n", | |
224abf92 NP |
226 | current->comm, page, (int)(2*sizeof(unsigned long)), |
227 | (unsigned long)page->flags, page->mapping, | |
228 | page_mapcount(page), page_count(page)); | |
1da177e4 | 229 | dump_stack(); |
334795ec HD |
230 | page->flags &= ~(1 << PG_lru | |
231 | 1 << PG_private | | |
1da177e4 | 232 | 1 << PG_locked | |
1da177e4 LT |
233 | 1 << PG_active | |
234 | 1 << PG_dirty | | |
334795ec HD |
235 | 1 << PG_reclaim | |
236 | 1 << PG_slab | | |
1da177e4 | 237 | 1 << PG_swapcache | |
676165a8 NP |
238 | 1 << PG_writeback | |
239 | 1 << PG_buddy ); | |
1da177e4 LT |
240 | set_page_count(page, 0); |
241 | reset_page_mapcount(page); | |
242 | page->mapping = NULL; | |
9f158333 | 243 | add_taint(TAINT_BAD_PAGE); |
1da177e4 LT |
244 | } |
245 | ||
1da177e4 LT |
246 | /* |
247 | * Higher-order pages are called "compound pages". They are structured thusly: | |
248 | * | |
249 | * The first PAGE_SIZE page is called the "head page". | |
250 | * | |
251 | * The remaining PAGE_SIZE pages are called "tail pages". | |
252 | * | |
253 | * All pages have PG_compound set. All pages have their ->private pointing at | |
254 | * the head page (even the head page has this). | |
255 | * | |
41d78ba5 HD |
256 | * The first tail page's ->lru.next holds the address of the compound page's |
257 | * put_page() function. Its ->lru.prev holds the order of allocation. | |
258 | * This usage means that zero-order pages may not be compound. | |
1da177e4 | 259 | */ |
d98c7a09 HD |
260 | |
261 | static void free_compound_page(struct page *page) | |
262 | { | |
d85f3385 | 263 | __free_pages_ok(page, compound_order(page)); |
d98c7a09 HD |
264 | } |
265 | ||
1da177e4 LT |
266 | static void prep_compound_page(struct page *page, unsigned long order) |
267 | { | |
268 | int i; | |
269 | int nr_pages = 1 << order; | |
270 | ||
33f2ef89 | 271 | set_compound_page_dtor(page, free_compound_page); |
d85f3385 | 272 | set_compound_order(page, order); |
6d777953 | 273 | __SetPageHead(page); |
d85f3385 | 274 | for (i = 1; i < nr_pages; i++) { |
1da177e4 LT |
275 | struct page *p = page + i; |
276 | ||
d85f3385 | 277 | __SetPageTail(p); |
d85f3385 | 278 | p->first_page = page; |
1da177e4 LT |
279 | } |
280 | } | |
281 | ||
282 | static void destroy_compound_page(struct page *page, unsigned long order) | |
283 | { | |
284 | int i; | |
285 | int nr_pages = 1 << order; | |
286 | ||
d85f3385 | 287 | if (unlikely(compound_order(page) != order)) |
224abf92 | 288 | bad_page(page); |
1da177e4 | 289 | |
6d777953 | 290 | if (unlikely(!PageHead(page))) |
d85f3385 | 291 | bad_page(page); |
6d777953 | 292 | __ClearPageHead(page); |
d85f3385 | 293 | for (i = 1; i < nr_pages; i++) { |
1da177e4 LT |
294 | struct page *p = page + i; |
295 | ||
6d777953 | 296 | if (unlikely(!PageTail(p) | |
d85f3385 | 297 | (p->first_page != page))) |
224abf92 | 298 | bad_page(page); |
d85f3385 | 299 | __ClearPageTail(p); |
1da177e4 LT |
300 | } |
301 | } | |
1da177e4 | 302 | |
17cf4406 NP |
303 | static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags) |
304 | { | |
305 | int i; | |
306 | ||
725d704e | 307 | VM_BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM); |
6626c5d5 AM |
308 | /* |
309 | * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO | |
310 | * and __GFP_HIGHMEM from hard or soft interrupt context. | |
311 | */ | |
725d704e | 312 | VM_BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt()); |
17cf4406 NP |
313 | for (i = 0; i < (1 << order); i++) |
314 | clear_highpage(page + i); | |
315 | } | |
316 | ||
6aa3001b AM |
317 | static inline void set_page_order(struct page *page, int order) |
318 | { | |
4c21e2f2 | 319 | set_page_private(page, order); |
676165a8 | 320 | __SetPageBuddy(page); |
1da177e4 LT |
321 | } |
322 | ||
323 | static inline void rmv_page_order(struct page *page) | |
324 | { | |
676165a8 | 325 | __ClearPageBuddy(page); |
4c21e2f2 | 326 | set_page_private(page, 0); |
1da177e4 LT |
327 | } |
328 | ||
329 | /* | |
330 | * Locate the struct page for both the matching buddy in our | |
331 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
332 | * | |
333 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
334 | * the following equation: | |
335 | * B2 = B1 ^ (1 << O) | |
336 | * For example, if the starting buddy (buddy2) is #8 its order | |
337 | * 1 buddy is #10: | |
338 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
339 | * | |
340 | * 2) Any buddy B will have an order O+1 parent P which | |
341 | * satisfies the following equation: | |
342 | * P = B & ~(1 << O) | |
343 | * | |
d6e05edc | 344 | * Assumption: *_mem_map is contiguous at least up to MAX_ORDER |
1da177e4 LT |
345 | */ |
346 | static inline struct page * | |
347 | __page_find_buddy(struct page *page, unsigned long page_idx, unsigned int order) | |
348 | { | |
349 | unsigned long buddy_idx = page_idx ^ (1 << order); | |
350 | ||
351 | return page + (buddy_idx - page_idx); | |
352 | } | |
353 | ||
354 | static inline unsigned long | |
355 | __find_combined_index(unsigned long page_idx, unsigned int order) | |
356 | { | |
357 | return (page_idx & ~(1 << order)); | |
358 | } | |
359 | ||
360 | /* | |
361 | * This function checks whether a page is free && is the buddy | |
362 | * we can do coalesce a page and its buddy if | |
13e7444b | 363 | * (a) the buddy is not in a hole && |
676165a8 | 364 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
365 | * (c) a page and its buddy have the same order && |
366 | * (d) a page and its buddy are in the same zone. | |
676165a8 NP |
367 | * |
368 | * For recording whether a page is in the buddy system, we use PG_buddy. | |
369 | * Setting, clearing, and testing PG_buddy is serialized by zone->lock. | |
1da177e4 | 370 | * |
676165a8 | 371 | * For recording page's order, we use page_private(page). |
1da177e4 | 372 | */ |
cb2b95e1 AW |
373 | static inline int page_is_buddy(struct page *page, struct page *buddy, |
374 | int order) | |
1da177e4 | 375 | { |
14e07298 | 376 | if (!pfn_valid_within(page_to_pfn(buddy))) |
13e7444b | 377 | return 0; |
13e7444b | 378 | |
cb2b95e1 AW |
379 | if (page_zone_id(page) != page_zone_id(buddy)) |
380 | return 0; | |
381 | ||
382 | if (PageBuddy(buddy) && page_order(buddy) == order) { | |
383 | BUG_ON(page_count(buddy) != 0); | |
6aa3001b | 384 | return 1; |
676165a8 | 385 | } |
6aa3001b | 386 | return 0; |
1da177e4 LT |
387 | } |
388 | ||
389 | /* | |
390 | * Freeing function for a buddy system allocator. | |
391 | * | |
392 | * The concept of a buddy system is to maintain direct-mapped table | |
393 | * (containing bit values) for memory blocks of various "orders". | |
394 | * The bottom level table contains the map for the smallest allocatable | |
395 | * units of memory (here, pages), and each level above it describes | |
396 | * pairs of units from the levels below, hence, "buddies". | |
397 | * At a high level, all that happens here is marking the table entry | |
398 | * at the bottom level available, and propagating the changes upward | |
399 | * as necessary, plus some accounting needed to play nicely with other | |
400 | * parts of the VM system. | |
401 | * At each level, we keep a list of pages, which are heads of continuous | |
676165a8 | 402 | * free pages of length of (1 << order) and marked with PG_buddy. Page's |
4c21e2f2 | 403 | * order is recorded in page_private(page) field. |
1da177e4 LT |
404 | * So when we are allocating or freeing one, we can derive the state of the |
405 | * other. That is, if we allocate a small block, and both were | |
406 | * free, the remainder of the region must be split into blocks. | |
407 | * If a block is freed, and its buddy is also free, then this | |
408 | * triggers coalescing into a block of larger size. | |
409 | * | |
410 | * -- wli | |
411 | */ | |
412 | ||
48db57f8 | 413 | static inline void __free_one_page(struct page *page, |
1da177e4 LT |
414 | struct zone *zone, unsigned int order) |
415 | { | |
416 | unsigned long page_idx; | |
417 | int order_size = 1 << order; | |
b2a0ac88 | 418 | int migratetype = get_pageblock_migratetype(page); |
1da177e4 | 419 | |
224abf92 | 420 | if (unlikely(PageCompound(page))) |
1da177e4 LT |
421 | destroy_compound_page(page, order); |
422 | ||
423 | page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1); | |
424 | ||
725d704e NP |
425 | VM_BUG_ON(page_idx & (order_size - 1)); |
426 | VM_BUG_ON(bad_range(zone, page)); | |
1da177e4 | 427 | |
d23ad423 | 428 | __mod_zone_page_state(zone, NR_FREE_PAGES, order_size); |
1da177e4 LT |
429 | while (order < MAX_ORDER-1) { |
430 | unsigned long combined_idx; | |
1da177e4 LT |
431 | struct page *buddy; |
432 | ||
1da177e4 | 433 | buddy = __page_find_buddy(page, page_idx, order); |
cb2b95e1 | 434 | if (!page_is_buddy(page, buddy, order)) |
1da177e4 | 435 | break; /* Move the buddy up one level. */ |
13e7444b | 436 | |
1da177e4 | 437 | list_del(&buddy->lru); |
b2a0ac88 | 438 | zone->free_area[order].nr_free--; |
1da177e4 | 439 | rmv_page_order(buddy); |
13e7444b | 440 | combined_idx = __find_combined_index(page_idx, order); |
1da177e4 LT |
441 | page = page + (combined_idx - page_idx); |
442 | page_idx = combined_idx; | |
443 | order++; | |
444 | } | |
445 | set_page_order(page, order); | |
b2a0ac88 MG |
446 | list_add(&page->lru, |
447 | &zone->free_area[order].free_list[migratetype]); | |
1da177e4 LT |
448 | zone->free_area[order].nr_free++; |
449 | } | |
450 | ||
224abf92 | 451 | static inline int free_pages_check(struct page *page) |
1da177e4 | 452 | { |
92be2e33 NP |
453 | if (unlikely(page_mapcount(page) | |
454 | (page->mapping != NULL) | | |
455 | (page_count(page) != 0) | | |
1da177e4 LT |
456 | (page->flags & ( |
457 | 1 << PG_lru | | |
458 | 1 << PG_private | | |
459 | 1 << PG_locked | | |
460 | 1 << PG_active | | |
1da177e4 LT |
461 | 1 << PG_slab | |
462 | 1 << PG_swapcache | | |
b5810039 | 463 | 1 << PG_writeback | |
676165a8 NP |
464 | 1 << PG_reserved | |
465 | 1 << PG_buddy )))) | |
224abf92 | 466 | bad_page(page); |
1da177e4 | 467 | if (PageDirty(page)) |
242e5468 | 468 | __ClearPageDirty(page); |
689bcebf HD |
469 | /* |
470 | * For now, we report if PG_reserved was found set, but do not | |
471 | * clear it, and do not free the page. But we shall soon need | |
472 | * to do more, for when the ZERO_PAGE count wraps negative. | |
473 | */ | |
474 | return PageReserved(page); | |
1da177e4 LT |
475 | } |
476 | ||
477 | /* | |
478 | * Frees a list of pages. | |
479 | * Assumes all pages on list are in same zone, and of same order. | |
207f36ee | 480 | * count is the number of pages to free. |
1da177e4 LT |
481 | * |
482 | * If the zone was previously in an "all pages pinned" state then look to | |
483 | * see if this freeing clears that state. | |
484 | * | |
485 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
486 | * pinned" detection logic. | |
487 | */ | |
48db57f8 NP |
488 | static void free_pages_bulk(struct zone *zone, int count, |
489 | struct list_head *list, int order) | |
1da177e4 | 490 | { |
c54ad30c | 491 | spin_lock(&zone->lock); |
1da177e4 LT |
492 | zone->all_unreclaimable = 0; |
493 | zone->pages_scanned = 0; | |
48db57f8 NP |
494 | while (count--) { |
495 | struct page *page; | |
496 | ||
725d704e | 497 | VM_BUG_ON(list_empty(list)); |
1da177e4 | 498 | page = list_entry(list->prev, struct page, lru); |
48db57f8 | 499 | /* have to delete it as __free_one_page list manipulates */ |
1da177e4 | 500 | list_del(&page->lru); |
48db57f8 | 501 | __free_one_page(page, zone, order); |
1da177e4 | 502 | } |
c54ad30c | 503 | spin_unlock(&zone->lock); |
1da177e4 LT |
504 | } |
505 | ||
48db57f8 | 506 | static void free_one_page(struct zone *zone, struct page *page, int order) |
1da177e4 | 507 | { |
006d22d9 CL |
508 | spin_lock(&zone->lock); |
509 | zone->all_unreclaimable = 0; | |
510 | zone->pages_scanned = 0; | |
0798e519 | 511 | __free_one_page(page, zone, order); |
006d22d9 | 512 | spin_unlock(&zone->lock); |
48db57f8 NP |
513 | } |
514 | ||
515 | static void __free_pages_ok(struct page *page, unsigned int order) | |
516 | { | |
517 | unsigned long flags; | |
1da177e4 | 518 | int i; |
689bcebf | 519 | int reserved = 0; |
1da177e4 | 520 | |
1da177e4 | 521 | for (i = 0 ; i < (1 << order) ; ++i) |
224abf92 | 522 | reserved += free_pages_check(page + i); |
689bcebf HD |
523 | if (reserved) |
524 | return; | |
525 | ||
9858db50 NP |
526 | if (!PageHighMem(page)) |
527 | debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order); | |
dafb1367 | 528 | arch_free_page(page, order); |
48db57f8 | 529 | kernel_map_pages(page, 1 << order, 0); |
dafb1367 | 530 | |
c54ad30c | 531 | local_irq_save(flags); |
f8891e5e | 532 | __count_vm_events(PGFREE, 1 << order); |
48db57f8 | 533 | free_one_page(page_zone(page), page, order); |
c54ad30c | 534 | local_irq_restore(flags); |
1da177e4 LT |
535 | } |
536 | ||
a226f6c8 DH |
537 | /* |
538 | * permit the bootmem allocator to evade page validation on high-order frees | |
539 | */ | |
540 | void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order) | |
541 | { | |
542 | if (order == 0) { | |
543 | __ClearPageReserved(page); | |
544 | set_page_count(page, 0); | |
7835e98b | 545 | set_page_refcounted(page); |
545b1ea9 | 546 | __free_page(page); |
a226f6c8 | 547 | } else { |
a226f6c8 DH |
548 | int loop; |
549 | ||
545b1ea9 | 550 | prefetchw(page); |
a226f6c8 DH |
551 | for (loop = 0; loop < BITS_PER_LONG; loop++) { |
552 | struct page *p = &page[loop]; | |
553 | ||
545b1ea9 NP |
554 | if (loop + 1 < BITS_PER_LONG) |
555 | prefetchw(p + 1); | |
a226f6c8 DH |
556 | __ClearPageReserved(p); |
557 | set_page_count(p, 0); | |
558 | } | |
559 | ||
7835e98b | 560 | set_page_refcounted(page); |
545b1ea9 | 561 | __free_pages(page, order); |
a226f6c8 DH |
562 | } |
563 | } | |
564 | ||
1da177e4 LT |
565 | |
566 | /* | |
567 | * The order of subdivision here is critical for the IO subsystem. | |
568 | * Please do not alter this order without good reasons and regression | |
569 | * testing. Specifically, as large blocks of memory are subdivided, | |
570 | * the order in which smaller blocks are delivered depends on the order | |
571 | * they're subdivided in this function. This is the primary factor | |
572 | * influencing the order in which pages are delivered to the IO | |
573 | * subsystem according to empirical testing, and this is also justified | |
574 | * by considering the behavior of a buddy system containing a single | |
575 | * large block of memory acted on by a series of small allocations. | |
576 | * This behavior is a critical factor in sglist merging's success. | |
577 | * | |
578 | * -- wli | |
579 | */ | |
085cc7d5 | 580 | static inline void expand(struct zone *zone, struct page *page, |
b2a0ac88 MG |
581 | int low, int high, struct free_area *area, |
582 | int migratetype) | |
1da177e4 LT |
583 | { |
584 | unsigned long size = 1 << high; | |
585 | ||
586 | while (high > low) { | |
587 | area--; | |
588 | high--; | |
589 | size >>= 1; | |
725d704e | 590 | VM_BUG_ON(bad_range(zone, &page[size])); |
b2a0ac88 | 591 | list_add(&page[size].lru, &area->free_list[migratetype]); |
1da177e4 LT |
592 | area->nr_free++; |
593 | set_page_order(&page[size], high); | |
594 | } | |
1da177e4 LT |
595 | } |
596 | ||
1da177e4 LT |
597 | /* |
598 | * This page is about to be returned from the page allocator | |
599 | */ | |
17cf4406 | 600 | static int prep_new_page(struct page *page, int order, gfp_t gfp_flags) |
1da177e4 | 601 | { |
92be2e33 NP |
602 | if (unlikely(page_mapcount(page) | |
603 | (page->mapping != NULL) | | |
604 | (page_count(page) != 0) | | |
334795ec HD |
605 | (page->flags & ( |
606 | 1 << PG_lru | | |
1da177e4 LT |
607 | 1 << PG_private | |
608 | 1 << PG_locked | | |
1da177e4 LT |
609 | 1 << PG_active | |
610 | 1 << PG_dirty | | |
334795ec | 611 | 1 << PG_slab | |
1da177e4 | 612 | 1 << PG_swapcache | |
b5810039 | 613 | 1 << PG_writeback | |
676165a8 NP |
614 | 1 << PG_reserved | |
615 | 1 << PG_buddy )))) | |
224abf92 | 616 | bad_page(page); |
1da177e4 | 617 | |
689bcebf HD |
618 | /* |
619 | * For now, we report if PG_reserved was found set, but do not | |
620 | * clear it, and do not allocate the page: as a safety net. | |
621 | */ | |
622 | if (PageReserved(page)) | |
623 | return 1; | |
624 | ||
d77c2d7c | 625 | page->flags &= ~(1 << PG_uptodate | 1 << PG_error | 1 << PG_readahead | |
1da177e4 | 626 | 1 << PG_referenced | 1 << PG_arch_1 | |
5409bae0 | 627 | 1 << PG_owner_priv_1 | 1 << PG_mappedtodisk); |
4c21e2f2 | 628 | set_page_private(page, 0); |
7835e98b | 629 | set_page_refcounted(page); |
cc102509 NP |
630 | |
631 | arch_alloc_page(page, order); | |
1da177e4 | 632 | kernel_map_pages(page, 1 << order, 1); |
17cf4406 NP |
633 | |
634 | if (gfp_flags & __GFP_ZERO) | |
635 | prep_zero_page(page, order, gfp_flags); | |
636 | ||
637 | if (order && (gfp_flags & __GFP_COMP)) | |
638 | prep_compound_page(page, order); | |
639 | ||
689bcebf | 640 | return 0; |
1da177e4 LT |
641 | } |
642 | ||
56fd56b8 MG |
643 | /* |
644 | * Go through the free lists for the given migratetype and remove | |
645 | * the smallest available page from the freelists | |
646 | */ | |
647 | static struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, | |
648 | int migratetype) | |
649 | { | |
650 | unsigned int current_order; | |
651 | struct free_area * area; | |
652 | struct page *page; | |
653 | ||
654 | /* Find a page of the appropriate size in the preferred list */ | |
655 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
656 | area = &(zone->free_area[current_order]); | |
657 | if (list_empty(&area->free_list[migratetype])) | |
658 | continue; | |
659 | ||
660 | page = list_entry(area->free_list[migratetype].next, | |
661 | struct page, lru); | |
662 | list_del(&page->lru); | |
663 | rmv_page_order(page); | |
664 | area->nr_free--; | |
665 | __mod_zone_page_state(zone, NR_FREE_PAGES, - (1UL << order)); | |
666 | expand(zone, page, order, current_order, area, migratetype); | |
667 | return page; | |
668 | } | |
669 | ||
670 | return NULL; | |
671 | } | |
672 | ||
673 | ||
b2a0ac88 MG |
674 | /* |
675 | * This array describes the order lists are fallen back to when | |
676 | * the free lists for the desirable migrate type are depleted | |
677 | */ | |
678 | static int fallbacks[MIGRATE_TYPES][MIGRATE_TYPES-1] = { | |
64c5e135 MG |
679 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, |
680 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, | |
681 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE }, | |
682 | [MIGRATE_RESERVE] = { MIGRATE_RESERVE, MIGRATE_RESERVE, MIGRATE_RESERVE }, /* Never used */ | |
b2a0ac88 MG |
683 | }; |
684 | ||
c361be55 MG |
685 | /* |
686 | * Move the free pages in a range to the free lists of the requested type. | |
d9c23400 | 687 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
688 | * boundary. If alignment is required, use move_freepages_block() |
689 | */ | |
690 | int move_freepages(struct zone *zone, | |
691 | struct page *start_page, struct page *end_page, | |
692 | int migratetype) | |
693 | { | |
694 | struct page *page; | |
695 | unsigned long order; | |
d100313f | 696 | int pages_moved = 0; |
c361be55 MG |
697 | |
698 | #ifndef CONFIG_HOLES_IN_ZONE | |
699 | /* | |
700 | * page_zone is not safe to call in this context when | |
701 | * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant | |
702 | * anyway as we check zone boundaries in move_freepages_block(). | |
703 | * Remove at a later date when no bug reports exist related to | |
ac0e5b7a | 704 | * grouping pages by mobility |
c361be55 MG |
705 | */ |
706 | BUG_ON(page_zone(start_page) != page_zone(end_page)); | |
707 | #endif | |
708 | ||
709 | for (page = start_page; page <= end_page;) { | |
710 | if (!pfn_valid_within(page_to_pfn(page))) { | |
711 | page++; | |
712 | continue; | |
713 | } | |
714 | ||
715 | if (!PageBuddy(page)) { | |
716 | page++; | |
717 | continue; | |
718 | } | |
719 | ||
720 | order = page_order(page); | |
721 | list_del(&page->lru); | |
722 | list_add(&page->lru, | |
723 | &zone->free_area[order].free_list[migratetype]); | |
724 | page += 1 << order; | |
d100313f | 725 | pages_moved += 1 << order; |
c361be55 MG |
726 | } |
727 | ||
d100313f | 728 | return pages_moved; |
c361be55 MG |
729 | } |
730 | ||
731 | int move_freepages_block(struct zone *zone, struct page *page, int migratetype) | |
732 | { | |
733 | unsigned long start_pfn, end_pfn; | |
734 | struct page *start_page, *end_page; | |
735 | ||
736 | start_pfn = page_to_pfn(page); | |
d9c23400 | 737 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 738 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
739 | end_page = start_page + pageblock_nr_pages - 1; |
740 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
741 | |
742 | /* Do not cross zone boundaries */ | |
743 | if (start_pfn < zone->zone_start_pfn) | |
744 | start_page = page; | |
745 | if (end_pfn >= zone->zone_start_pfn + zone->spanned_pages) | |
746 | return 0; | |
747 | ||
748 | return move_freepages(zone, start_page, end_page, migratetype); | |
749 | } | |
750 | ||
5adc5be7 MG |
751 | /* Return the page with the lowest PFN in the list */ |
752 | static struct page *min_page(struct list_head *list) | |
753 | { | |
754 | unsigned long min_pfn = -1UL; | |
755 | struct page *min_page = NULL, *page;; | |
756 | ||
757 | list_for_each_entry(page, list, lru) { | |
758 | unsigned long pfn = page_to_pfn(page); | |
759 | if (pfn < min_pfn) { | |
760 | min_pfn = pfn; | |
761 | min_page = page; | |
762 | } | |
763 | } | |
764 | ||
765 | return min_page; | |
766 | } | |
767 | ||
b2a0ac88 MG |
768 | /* Remove an element from the buddy allocator from the fallback list */ |
769 | static struct page *__rmqueue_fallback(struct zone *zone, int order, | |
770 | int start_migratetype) | |
771 | { | |
772 | struct free_area * area; | |
773 | int current_order; | |
774 | struct page *page; | |
775 | int migratetype, i; | |
776 | ||
777 | /* Find the largest possible block of pages in the other list */ | |
778 | for (current_order = MAX_ORDER-1; current_order >= order; | |
779 | --current_order) { | |
780 | for (i = 0; i < MIGRATE_TYPES - 1; i++) { | |
781 | migratetype = fallbacks[start_migratetype][i]; | |
782 | ||
56fd56b8 MG |
783 | /* MIGRATE_RESERVE handled later if necessary */ |
784 | if (migratetype == MIGRATE_RESERVE) | |
785 | continue; | |
e010487d | 786 | |
b2a0ac88 MG |
787 | area = &(zone->free_area[current_order]); |
788 | if (list_empty(&area->free_list[migratetype])) | |
789 | continue; | |
790 | ||
5adc5be7 | 791 | /* Bias kernel allocations towards low pfns */ |
b2a0ac88 MG |
792 | page = list_entry(area->free_list[migratetype].next, |
793 | struct page, lru); | |
5adc5be7 MG |
794 | if (unlikely(start_migratetype != MIGRATE_MOVABLE)) |
795 | page = min_page(&area->free_list[migratetype]); | |
b2a0ac88 MG |
796 | area->nr_free--; |
797 | ||
798 | /* | |
c361be55 | 799 | * If breaking a large block of pages, move all free |
46dafbca MG |
800 | * pages to the preferred allocation list. If falling |
801 | * back for a reclaimable kernel allocation, be more | |
802 | * agressive about taking ownership of free pages | |
b2a0ac88 | 803 | */ |
d9c23400 | 804 | if (unlikely(current_order >= (pageblock_order >> 1)) || |
46dafbca MG |
805 | start_migratetype == MIGRATE_RECLAIMABLE) { |
806 | unsigned long pages; | |
807 | pages = move_freepages_block(zone, page, | |
808 | start_migratetype); | |
809 | ||
810 | /* Claim the whole block if over half of it is free */ | |
d9c23400 | 811 | if (pages >= (1 << (pageblock_order-1))) |
46dafbca MG |
812 | set_pageblock_migratetype(page, |
813 | start_migratetype); | |
814 | ||
b2a0ac88 | 815 | migratetype = start_migratetype; |
c361be55 | 816 | } |
b2a0ac88 MG |
817 | |
818 | /* Remove the page from the freelists */ | |
819 | list_del(&page->lru); | |
820 | rmv_page_order(page); | |
821 | __mod_zone_page_state(zone, NR_FREE_PAGES, | |
822 | -(1UL << order)); | |
823 | ||
d9c23400 | 824 | if (current_order == pageblock_order) |
b2a0ac88 MG |
825 | set_pageblock_migratetype(page, |
826 | start_migratetype); | |
827 | ||
828 | expand(zone, page, order, current_order, area, migratetype); | |
829 | return page; | |
830 | } | |
831 | } | |
832 | ||
56fd56b8 MG |
833 | /* Use MIGRATE_RESERVE rather than fail an allocation */ |
834 | return __rmqueue_smallest(zone, order, MIGRATE_RESERVE); | |
b2a0ac88 MG |
835 | } |
836 | ||
56fd56b8 | 837 | /* |
1da177e4 LT |
838 | * Do the hard work of removing an element from the buddy allocator. |
839 | * Call me with the zone->lock already held. | |
840 | */ | |
b2a0ac88 MG |
841 | static struct page *__rmqueue(struct zone *zone, unsigned int order, |
842 | int migratetype) | |
1da177e4 | 843 | { |
1da177e4 LT |
844 | struct page *page; |
845 | ||
56fd56b8 | 846 | page = __rmqueue_smallest(zone, order, migratetype); |
b2a0ac88 | 847 | |
56fd56b8 MG |
848 | if (unlikely(!page)) |
849 | page = __rmqueue_fallback(zone, order, migratetype); | |
b2a0ac88 MG |
850 | |
851 | return page; | |
1da177e4 LT |
852 | } |
853 | ||
854 | /* | |
855 | * Obtain a specified number of elements from the buddy allocator, all under | |
856 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
857 | * Returns the number of new pages which were placed at *list. | |
858 | */ | |
859 | static int rmqueue_bulk(struct zone *zone, unsigned int order, | |
b2a0ac88 MG |
860 | unsigned long count, struct list_head *list, |
861 | int migratetype) | |
1da177e4 | 862 | { |
1da177e4 | 863 | int i; |
1da177e4 | 864 | |
c54ad30c | 865 | spin_lock(&zone->lock); |
1da177e4 | 866 | for (i = 0; i < count; ++i) { |
b2a0ac88 | 867 | struct page *page = __rmqueue(zone, order, migratetype); |
085cc7d5 | 868 | if (unlikely(page == NULL)) |
1da177e4 | 869 | break; |
535131e6 MG |
870 | list_add(&page->lru, list); |
871 | set_page_private(page, migratetype); | |
1da177e4 | 872 | } |
c54ad30c | 873 | spin_unlock(&zone->lock); |
085cc7d5 | 874 | return i; |
1da177e4 LT |
875 | } |
876 | ||
4ae7c039 | 877 | #ifdef CONFIG_NUMA |
8fce4d8e | 878 | /* |
4037d452 CL |
879 | * Called from the vmstat counter updater to drain pagesets of this |
880 | * currently executing processor on remote nodes after they have | |
881 | * expired. | |
882 | * | |
879336c3 CL |
883 | * Note that this function must be called with the thread pinned to |
884 | * a single processor. | |
8fce4d8e | 885 | */ |
4037d452 | 886 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 887 | { |
4ae7c039 | 888 | unsigned long flags; |
4037d452 | 889 | int to_drain; |
4ae7c039 | 890 | |
4037d452 CL |
891 | local_irq_save(flags); |
892 | if (pcp->count >= pcp->batch) | |
893 | to_drain = pcp->batch; | |
894 | else | |
895 | to_drain = pcp->count; | |
896 | free_pages_bulk(zone, to_drain, &pcp->list, 0); | |
897 | pcp->count -= to_drain; | |
898 | local_irq_restore(flags); | |
4ae7c039 CL |
899 | } |
900 | #endif | |
901 | ||
1da177e4 LT |
902 | static void __drain_pages(unsigned int cpu) |
903 | { | |
c54ad30c | 904 | unsigned long flags; |
1da177e4 LT |
905 | struct zone *zone; |
906 | int i; | |
907 | ||
908 | for_each_zone(zone) { | |
909 | struct per_cpu_pageset *pset; | |
910 | ||
f2e12bb2 CL |
911 | if (!populated_zone(zone)) |
912 | continue; | |
913 | ||
e7c8d5c9 | 914 | pset = zone_pcp(zone, cpu); |
1da177e4 LT |
915 | for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) { |
916 | struct per_cpu_pages *pcp; | |
917 | ||
918 | pcp = &pset->pcp[i]; | |
c54ad30c | 919 | local_irq_save(flags); |
48db57f8 NP |
920 | free_pages_bulk(zone, pcp->count, &pcp->list, 0); |
921 | pcp->count = 0; | |
c54ad30c | 922 | local_irq_restore(flags); |
1da177e4 LT |
923 | } |
924 | } | |
925 | } | |
1da177e4 | 926 | |
296699de | 927 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
928 | |
929 | void mark_free_pages(struct zone *zone) | |
930 | { | |
f623f0db RW |
931 | unsigned long pfn, max_zone_pfn; |
932 | unsigned long flags; | |
b2a0ac88 | 933 | int order, t; |
1da177e4 LT |
934 | struct list_head *curr; |
935 | ||
936 | if (!zone->spanned_pages) | |
937 | return; | |
938 | ||
939 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db RW |
940 | |
941 | max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
942 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) | |
943 | if (pfn_valid(pfn)) { | |
944 | struct page *page = pfn_to_page(pfn); | |
945 | ||
7be98234 RW |
946 | if (!swsusp_page_is_forbidden(page)) |
947 | swsusp_unset_page_free(page); | |
f623f0db | 948 | } |
1da177e4 | 949 | |
b2a0ac88 MG |
950 | for_each_migratetype_order(order, t) { |
951 | list_for_each(curr, &zone->free_area[order].free_list[t]) { | |
f623f0db | 952 | unsigned long i; |
1da177e4 | 953 | |
f623f0db RW |
954 | pfn = page_to_pfn(list_entry(curr, struct page, lru)); |
955 | for (i = 0; i < (1UL << order); i++) | |
7be98234 | 956 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
f623f0db | 957 | } |
b2a0ac88 | 958 | } |
1da177e4 LT |
959 | spin_unlock_irqrestore(&zone->lock, flags); |
960 | } | |
e2c55dc8 | 961 | #endif /* CONFIG_PM */ |
1da177e4 LT |
962 | |
963 | /* | |
964 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
965 | */ | |
966 | void drain_local_pages(void) | |
967 | { | |
968 | unsigned long flags; | |
969 | ||
970 | local_irq_save(flags); | |
971 | __drain_pages(smp_processor_id()); | |
972 | local_irq_restore(flags); | |
973 | } | |
e2c55dc8 MG |
974 | |
975 | void smp_drain_local_pages(void *arg) | |
976 | { | |
977 | drain_local_pages(); | |
978 | } | |
979 | ||
980 | /* | |
981 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator | |
982 | */ | |
983 | void drain_all_local_pages(void) | |
984 | { | |
985 | unsigned long flags; | |
986 | ||
987 | local_irq_save(flags); | |
988 | __drain_pages(smp_processor_id()); | |
989 | local_irq_restore(flags); | |
990 | ||
991 | smp_call_function(smp_drain_local_pages, NULL, 0, 1); | |
992 | } | |
1da177e4 | 993 | |
1da177e4 LT |
994 | /* |
995 | * Free a 0-order page | |
996 | */ | |
1da177e4 LT |
997 | static void fastcall free_hot_cold_page(struct page *page, int cold) |
998 | { | |
999 | struct zone *zone = page_zone(page); | |
1000 | struct per_cpu_pages *pcp; | |
1001 | unsigned long flags; | |
1002 | ||
1da177e4 LT |
1003 | if (PageAnon(page)) |
1004 | page->mapping = NULL; | |
224abf92 | 1005 | if (free_pages_check(page)) |
689bcebf HD |
1006 | return; |
1007 | ||
9858db50 NP |
1008 | if (!PageHighMem(page)) |
1009 | debug_check_no_locks_freed(page_address(page), PAGE_SIZE); | |
dafb1367 | 1010 | arch_free_page(page, 0); |
689bcebf HD |
1011 | kernel_map_pages(page, 1, 0); |
1012 | ||
e7c8d5c9 | 1013 | pcp = &zone_pcp(zone, get_cpu())->pcp[cold]; |
1da177e4 | 1014 | local_irq_save(flags); |
f8891e5e | 1015 | __count_vm_event(PGFREE); |
1da177e4 | 1016 | list_add(&page->lru, &pcp->list); |
535131e6 | 1017 | set_page_private(page, get_pageblock_migratetype(page)); |
1da177e4 | 1018 | pcp->count++; |
48db57f8 NP |
1019 | if (pcp->count >= pcp->high) { |
1020 | free_pages_bulk(zone, pcp->batch, &pcp->list, 0); | |
1021 | pcp->count -= pcp->batch; | |
1022 | } | |
1da177e4 LT |
1023 | local_irq_restore(flags); |
1024 | put_cpu(); | |
1025 | } | |
1026 | ||
1027 | void fastcall free_hot_page(struct page *page) | |
1028 | { | |
1029 | free_hot_cold_page(page, 0); | |
1030 | } | |
1031 | ||
1032 | void fastcall free_cold_page(struct page *page) | |
1033 | { | |
1034 | free_hot_cold_page(page, 1); | |
1035 | } | |
1036 | ||
8dfcc9ba NP |
1037 | /* |
1038 | * split_page takes a non-compound higher-order page, and splits it into | |
1039 | * n (1<<order) sub-pages: page[0..n] | |
1040 | * Each sub-page must be freed individually. | |
1041 | * | |
1042 | * Note: this is probably too low level an operation for use in drivers. | |
1043 | * Please consult with lkml before using this in your driver. | |
1044 | */ | |
1045 | void split_page(struct page *page, unsigned int order) | |
1046 | { | |
1047 | int i; | |
1048 | ||
725d704e NP |
1049 | VM_BUG_ON(PageCompound(page)); |
1050 | VM_BUG_ON(!page_count(page)); | |
7835e98b NP |
1051 | for (i = 1; i < (1 << order); i++) |
1052 | set_page_refcounted(page + i); | |
8dfcc9ba | 1053 | } |
8dfcc9ba | 1054 | |
1da177e4 LT |
1055 | /* |
1056 | * Really, prep_compound_page() should be called from __rmqueue_bulk(). But | |
1057 | * we cheat by calling it from here, in the order > 0 path. Saves a branch | |
1058 | * or two. | |
1059 | */ | |
a74609fa NP |
1060 | static struct page *buffered_rmqueue(struct zonelist *zonelist, |
1061 | struct zone *zone, int order, gfp_t gfp_flags) | |
1da177e4 LT |
1062 | { |
1063 | unsigned long flags; | |
689bcebf | 1064 | struct page *page; |
1da177e4 | 1065 | int cold = !!(gfp_flags & __GFP_COLD); |
a74609fa | 1066 | int cpu; |
64c5e135 | 1067 | int migratetype = allocflags_to_migratetype(gfp_flags); |
1da177e4 | 1068 | |
689bcebf | 1069 | again: |
a74609fa | 1070 | cpu = get_cpu(); |
48db57f8 | 1071 | if (likely(order == 0)) { |
1da177e4 LT |
1072 | struct per_cpu_pages *pcp; |
1073 | ||
a74609fa | 1074 | pcp = &zone_pcp(zone, cpu)->pcp[cold]; |
1da177e4 | 1075 | local_irq_save(flags); |
a74609fa | 1076 | if (!pcp->count) { |
941c7105 | 1077 | pcp->count = rmqueue_bulk(zone, 0, |
b2a0ac88 | 1078 | pcp->batch, &pcp->list, migratetype); |
a74609fa NP |
1079 | if (unlikely(!pcp->count)) |
1080 | goto failed; | |
1da177e4 | 1081 | } |
b92a6edd | 1082 | |
535131e6 | 1083 | /* Find a page of the appropriate migrate type */ |
b92a6edd MG |
1084 | list_for_each_entry(page, &pcp->list, lru) |
1085 | if (page_private(page) == migratetype) | |
535131e6 | 1086 | break; |
535131e6 | 1087 | |
b92a6edd MG |
1088 | /* Allocate more to the pcp list if necessary */ |
1089 | if (unlikely(&page->lru == &pcp->list)) { | |
535131e6 MG |
1090 | pcp->count += rmqueue_bulk(zone, 0, |
1091 | pcp->batch, &pcp->list, migratetype); | |
1092 | page = list_entry(pcp->list.next, struct page, lru); | |
535131e6 | 1093 | } |
b92a6edd MG |
1094 | |
1095 | list_del(&page->lru); | |
1096 | pcp->count--; | |
7fb1d9fc | 1097 | } else { |
1da177e4 | 1098 | spin_lock_irqsave(&zone->lock, flags); |
b2a0ac88 | 1099 | page = __rmqueue(zone, order, migratetype); |
a74609fa NP |
1100 | spin_unlock(&zone->lock); |
1101 | if (!page) | |
1102 | goto failed; | |
1da177e4 LT |
1103 | } |
1104 | ||
f8891e5e | 1105 | __count_zone_vm_events(PGALLOC, zone, 1 << order); |
ca889e6c | 1106 | zone_statistics(zonelist, zone); |
a74609fa NP |
1107 | local_irq_restore(flags); |
1108 | put_cpu(); | |
1da177e4 | 1109 | |
725d704e | 1110 | VM_BUG_ON(bad_range(zone, page)); |
17cf4406 | 1111 | if (prep_new_page(page, order, gfp_flags)) |
a74609fa | 1112 | goto again; |
1da177e4 | 1113 | return page; |
a74609fa NP |
1114 | |
1115 | failed: | |
1116 | local_irq_restore(flags); | |
1117 | put_cpu(); | |
1118 | return NULL; | |
1da177e4 LT |
1119 | } |
1120 | ||
7fb1d9fc | 1121 | #define ALLOC_NO_WATERMARKS 0x01 /* don't check watermarks at all */ |
3148890b NP |
1122 | #define ALLOC_WMARK_MIN 0x02 /* use pages_min watermark */ |
1123 | #define ALLOC_WMARK_LOW 0x04 /* use pages_low watermark */ | |
1124 | #define ALLOC_WMARK_HIGH 0x08 /* use pages_high watermark */ | |
1125 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ | |
1126 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
1127 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
7fb1d9fc | 1128 | |
933e312e AM |
1129 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
1130 | ||
1131 | static struct fail_page_alloc_attr { | |
1132 | struct fault_attr attr; | |
1133 | ||
1134 | u32 ignore_gfp_highmem; | |
1135 | u32 ignore_gfp_wait; | |
54114994 | 1136 | u32 min_order; |
933e312e AM |
1137 | |
1138 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
1139 | ||
1140 | struct dentry *ignore_gfp_highmem_file; | |
1141 | struct dentry *ignore_gfp_wait_file; | |
54114994 | 1142 | struct dentry *min_order_file; |
933e312e AM |
1143 | |
1144 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
1145 | ||
1146 | } fail_page_alloc = { | |
1147 | .attr = FAULT_ATTR_INITIALIZER, | |
6b1b60f4 DM |
1148 | .ignore_gfp_wait = 1, |
1149 | .ignore_gfp_highmem = 1, | |
54114994 | 1150 | .min_order = 1, |
933e312e AM |
1151 | }; |
1152 | ||
1153 | static int __init setup_fail_page_alloc(char *str) | |
1154 | { | |
1155 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
1156 | } | |
1157 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
1158 | ||
1159 | static int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | |
1160 | { | |
54114994 AM |
1161 | if (order < fail_page_alloc.min_order) |
1162 | return 0; | |
933e312e AM |
1163 | if (gfp_mask & __GFP_NOFAIL) |
1164 | return 0; | |
1165 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) | |
1166 | return 0; | |
1167 | if (fail_page_alloc.ignore_gfp_wait && (gfp_mask & __GFP_WAIT)) | |
1168 | return 0; | |
1169 | ||
1170 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
1171 | } | |
1172 | ||
1173 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
1174 | ||
1175 | static int __init fail_page_alloc_debugfs(void) | |
1176 | { | |
1177 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
1178 | struct dentry *dir; | |
1179 | int err; | |
1180 | ||
1181 | err = init_fault_attr_dentries(&fail_page_alloc.attr, | |
1182 | "fail_page_alloc"); | |
1183 | if (err) | |
1184 | return err; | |
1185 | dir = fail_page_alloc.attr.dentries.dir; | |
1186 | ||
1187 | fail_page_alloc.ignore_gfp_wait_file = | |
1188 | debugfs_create_bool("ignore-gfp-wait", mode, dir, | |
1189 | &fail_page_alloc.ignore_gfp_wait); | |
1190 | ||
1191 | fail_page_alloc.ignore_gfp_highmem_file = | |
1192 | debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
1193 | &fail_page_alloc.ignore_gfp_highmem); | |
54114994 AM |
1194 | fail_page_alloc.min_order_file = |
1195 | debugfs_create_u32("min-order", mode, dir, | |
1196 | &fail_page_alloc.min_order); | |
933e312e AM |
1197 | |
1198 | if (!fail_page_alloc.ignore_gfp_wait_file || | |
54114994 AM |
1199 | !fail_page_alloc.ignore_gfp_highmem_file || |
1200 | !fail_page_alloc.min_order_file) { | |
933e312e AM |
1201 | err = -ENOMEM; |
1202 | debugfs_remove(fail_page_alloc.ignore_gfp_wait_file); | |
1203 | debugfs_remove(fail_page_alloc.ignore_gfp_highmem_file); | |
54114994 | 1204 | debugfs_remove(fail_page_alloc.min_order_file); |
933e312e AM |
1205 | cleanup_fault_attr_dentries(&fail_page_alloc.attr); |
1206 | } | |
1207 | ||
1208 | return err; | |
1209 | } | |
1210 | ||
1211 | late_initcall(fail_page_alloc_debugfs); | |
1212 | ||
1213 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
1214 | ||
1215 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
1216 | ||
1217 | static inline int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | |
1218 | { | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
1223 | ||
1da177e4 LT |
1224 | /* |
1225 | * Return 1 if free pages are above 'mark'. This takes into account the order | |
1226 | * of the allocation. | |
1227 | */ | |
1228 | int zone_watermark_ok(struct zone *z, int order, unsigned long mark, | |
7fb1d9fc | 1229 | int classzone_idx, int alloc_flags) |
1da177e4 LT |
1230 | { |
1231 | /* free_pages my go negative - that's OK */ | |
d23ad423 CL |
1232 | long min = mark; |
1233 | long free_pages = zone_page_state(z, NR_FREE_PAGES) - (1 << order) + 1; | |
1da177e4 LT |
1234 | int o; |
1235 | ||
7fb1d9fc | 1236 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 1237 | min -= min / 2; |
7fb1d9fc | 1238 | if (alloc_flags & ALLOC_HARDER) |
1da177e4 LT |
1239 | min -= min / 4; |
1240 | ||
1241 | if (free_pages <= min + z->lowmem_reserve[classzone_idx]) | |
1242 | return 0; | |
1243 | for (o = 0; o < order; o++) { | |
1244 | /* At the next order, this order's pages become unavailable */ | |
1245 | free_pages -= z->free_area[o].nr_free << o; | |
1246 | ||
1247 | /* Require fewer higher order pages to be free */ | |
1248 | min >>= 1; | |
1249 | ||
1250 | if (free_pages <= min) | |
1251 | return 0; | |
1252 | } | |
1253 | return 1; | |
1254 | } | |
1255 | ||
9276b1bc PJ |
1256 | #ifdef CONFIG_NUMA |
1257 | /* | |
1258 | * zlc_setup - Setup for "zonelist cache". Uses cached zone data to | |
1259 | * skip over zones that are not allowed by the cpuset, or that have | |
1260 | * been recently (in last second) found to be nearly full. See further | |
1261 | * comments in mmzone.h. Reduces cache footprint of zonelist scans | |
1262 | * that have to skip over alot of full or unallowed zones. | |
1263 | * | |
1264 | * If the zonelist cache is present in the passed in zonelist, then | |
1265 | * returns a pointer to the allowed node mask (either the current | |
37b07e41 | 1266 | * tasks mems_allowed, or node_states[N_HIGH_MEMORY].) |
9276b1bc PJ |
1267 | * |
1268 | * If the zonelist cache is not available for this zonelist, does | |
1269 | * nothing and returns NULL. | |
1270 | * | |
1271 | * If the fullzones BITMAP in the zonelist cache is stale (more than | |
1272 | * a second since last zap'd) then we zap it out (clear its bits.) | |
1273 | * | |
1274 | * We hold off even calling zlc_setup, until after we've checked the | |
1275 | * first zone in the zonelist, on the theory that most allocations will | |
1276 | * be satisfied from that first zone, so best to examine that zone as | |
1277 | * quickly as we can. | |
1278 | */ | |
1279 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) | |
1280 | { | |
1281 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1282 | nodemask_t *allowednodes; /* zonelist_cache approximation */ | |
1283 | ||
1284 | zlc = zonelist->zlcache_ptr; | |
1285 | if (!zlc) | |
1286 | return NULL; | |
1287 | ||
1288 | if (jiffies - zlc->last_full_zap > 1 * HZ) { | |
1289 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); | |
1290 | zlc->last_full_zap = jiffies; | |
1291 | } | |
1292 | ||
1293 | allowednodes = !in_interrupt() && (alloc_flags & ALLOC_CPUSET) ? | |
1294 | &cpuset_current_mems_allowed : | |
37b07e41 | 1295 | &node_states[N_HIGH_MEMORY]; |
9276b1bc PJ |
1296 | return allowednodes; |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * Given 'z' scanning a zonelist, run a couple of quick checks to see | |
1301 | * if it is worth looking at further for free memory: | |
1302 | * 1) Check that the zone isn't thought to be full (doesn't have its | |
1303 | * bit set in the zonelist_cache fullzones BITMAP). | |
1304 | * 2) Check that the zones node (obtained from the zonelist_cache | |
1305 | * z_to_n[] mapping) is allowed in the passed in allowednodes mask. | |
1306 | * Return true (non-zero) if zone is worth looking at further, or | |
1307 | * else return false (zero) if it is not. | |
1308 | * | |
1309 | * This check -ignores- the distinction between various watermarks, | |
1310 | * such as GFP_HIGH, GFP_ATOMIC, PF_MEMALLOC, ... If a zone is | |
1311 | * found to be full for any variation of these watermarks, it will | |
1312 | * be considered full for up to one second by all requests, unless | |
1313 | * we are so low on memory on all allowed nodes that we are forced | |
1314 | * into the second scan of the zonelist. | |
1315 | * | |
1316 | * In the second scan we ignore this zonelist cache and exactly | |
1317 | * apply the watermarks to all zones, even it is slower to do so. | |
1318 | * We are low on memory in the second scan, and should leave no stone | |
1319 | * unturned looking for a free page. | |
1320 | */ | |
1321 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zone **z, | |
1322 | nodemask_t *allowednodes) | |
1323 | { | |
1324 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1325 | int i; /* index of *z in zonelist zones */ | |
1326 | int n; /* node that zone *z is on */ | |
1327 | ||
1328 | zlc = zonelist->zlcache_ptr; | |
1329 | if (!zlc) | |
1330 | return 1; | |
1331 | ||
1332 | i = z - zonelist->zones; | |
1333 | n = zlc->z_to_n[i]; | |
1334 | ||
1335 | /* This zone is worth trying if it is allowed but not full */ | |
1336 | return node_isset(n, *allowednodes) && !test_bit(i, zlc->fullzones); | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Given 'z' scanning a zonelist, set the corresponding bit in | |
1341 | * zlc->fullzones, so that subsequent attempts to allocate a page | |
1342 | * from that zone don't waste time re-examining it. | |
1343 | */ | |
1344 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zone **z) | |
1345 | { | |
1346 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1347 | int i; /* index of *z in zonelist zones */ | |
1348 | ||
1349 | zlc = zonelist->zlcache_ptr; | |
1350 | if (!zlc) | |
1351 | return; | |
1352 | ||
1353 | i = z - zonelist->zones; | |
1354 | ||
1355 | set_bit(i, zlc->fullzones); | |
1356 | } | |
1357 | ||
1358 | #else /* CONFIG_NUMA */ | |
1359 | ||
1360 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) | |
1361 | { | |
1362 | return NULL; | |
1363 | } | |
1364 | ||
1365 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zone **z, | |
1366 | nodemask_t *allowednodes) | |
1367 | { | |
1368 | return 1; | |
1369 | } | |
1370 | ||
1371 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zone **z) | |
1372 | { | |
1373 | } | |
1374 | #endif /* CONFIG_NUMA */ | |
1375 | ||
7fb1d9fc | 1376 | /* |
0798e519 | 1377 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
1378 | * a page. |
1379 | */ | |
1380 | static struct page * | |
1381 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, | |
1382 | struct zonelist *zonelist, int alloc_flags) | |
753ee728 | 1383 | { |
9276b1bc | 1384 | struct zone **z; |
7fb1d9fc | 1385 | struct page *page = NULL; |
9276b1bc | 1386 | int classzone_idx = zone_idx(zonelist->zones[0]); |
1192d526 | 1387 | struct zone *zone; |
9276b1bc PJ |
1388 | nodemask_t *allowednodes = NULL;/* zonelist_cache approximation */ |
1389 | int zlc_active = 0; /* set if using zonelist_cache */ | |
1390 | int did_zlc_setup = 0; /* just call zlc_setup() one time */ | |
b377fd39 | 1391 | enum zone_type highest_zoneidx = -1; /* Gets set for policy zonelists */ |
7fb1d9fc | 1392 | |
9276b1bc | 1393 | zonelist_scan: |
7fb1d9fc | 1394 | /* |
9276b1bc | 1395 | * Scan zonelist, looking for a zone with enough free. |
7fb1d9fc RS |
1396 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. |
1397 | */ | |
9276b1bc PJ |
1398 | z = zonelist->zones; |
1399 | ||
7fb1d9fc | 1400 | do { |
b377fd39 MG |
1401 | /* |
1402 | * In NUMA, this could be a policy zonelist which contains | |
1403 | * zones that may not be allowed by the current gfp_mask. | |
1404 | * Check the zone is allowed by the current flags | |
1405 | */ | |
1406 | if (unlikely(alloc_should_filter_zonelist(zonelist))) { | |
1407 | if (highest_zoneidx == -1) | |
1408 | highest_zoneidx = gfp_zone(gfp_mask); | |
1409 | if (zone_idx(*z) > highest_zoneidx) | |
1410 | continue; | |
1411 | } | |
1412 | ||
9276b1bc PJ |
1413 | if (NUMA_BUILD && zlc_active && |
1414 | !zlc_zone_worth_trying(zonelist, z, allowednodes)) | |
1415 | continue; | |
1192d526 | 1416 | zone = *z; |
7fb1d9fc | 1417 | if ((alloc_flags & ALLOC_CPUSET) && |
02a0e53d | 1418 | !cpuset_zone_allowed_softwall(zone, gfp_mask)) |
9276b1bc | 1419 | goto try_next_zone; |
7fb1d9fc RS |
1420 | |
1421 | if (!(alloc_flags & ALLOC_NO_WATERMARKS)) { | |
3148890b NP |
1422 | unsigned long mark; |
1423 | if (alloc_flags & ALLOC_WMARK_MIN) | |
1192d526 | 1424 | mark = zone->pages_min; |
3148890b | 1425 | else if (alloc_flags & ALLOC_WMARK_LOW) |
1192d526 | 1426 | mark = zone->pages_low; |
3148890b | 1427 | else |
1192d526 | 1428 | mark = zone->pages_high; |
0798e519 PJ |
1429 | if (!zone_watermark_ok(zone, order, mark, |
1430 | classzone_idx, alloc_flags)) { | |
9eeff239 | 1431 | if (!zone_reclaim_mode || |
1192d526 | 1432 | !zone_reclaim(zone, gfp_mask, order)) |
9276b1bc | 1433 | goto this_zone_full; |
0798e519 | 1434 | } |
7fb1d9fc RS |
1435 | } |
1436 | ||
1192d526 | 1437 | page = buffered_rmqueue(zonelist, zone, order, gfp_mask); |
0798e519 | 1438 | if (page) |
7fb1d9fc | 1439 | break; |
9276b1bc PJ |
1440 | this_zone_full: |
1441 | if (NUMA_BUILD) | |
1442 | zlc_mark_zone_full(zonelist, z); | |
1443 | try_next_zone: | |
1444 | if (NUMA_BUILD && !did_zlc_setup) { | |
1445 | /* we do zlc_setup after the first zone is tried */ | |
1446 | allowednodes = zlc_setup(zonelist, alloc_flags); | |
1447 | zlc_active = 1; | |
1448 | did_zlc_setup = 1; | |
1449 | } | |
7fb1d9fc | 1450 | } while (*(++z) != NULL); |
9276b1bc PJ |
1451 | |
1452 | if (unlikely(NUMA_BUILD && page == NULL && zlc_active)) { | |
1453 | /* Disable zlc cache for second zonelist scan */ | |
1454 | zlc_active = 0; | |
1455 | goto zonelist_scan; | |
1456 | } | |
7fb1d9fc | 1457 | return page; |
753ee728 MH |
1458 | } |
1459 | ||
1da177e4 LT |
1460 | /* |
1461 | * This is the 'heart' of the zoned buddy allocator. | |
1462 | */ | |
1463 | struct page * fastcall | |
dd0fc66f | 1464 | __alloc_pages(gfp_t gfp_mask, unsigned int order, |
1da177e4 LT |
1465 | struct zonelist *zonelist) |
1466 | { | |
260b2367 | 1467 | const gfp_t wait = gfp_mask & __GFP_WAIT; |
7fb1d9fc | 1468 | struct zone **z; |
1da177e4 LT |
1469 | struct page *page; |
1470 | struct reclaim_state reclaim_state; | |
1471 | struct task_struct *p = current; | |
1da177e4 | 1472 | int do_retry; |
7fb1d9fc | 1473 | int alloc_flags; |
1da177e4 LT |
1474 | int did_some_progress; |
1475 | ||
1476 | might_sleep_if(wait); | |
1477 | ||
933e312e AM |
1478 | if (should_fail_alloc_page(gfp_mask, order)) |
1479 | return NULL; | |
1480 | ||
6b1de916 | 1481 | restart: |
7fb1d9fc | 1482 | z = zonelist->zones; /* the list of zones suitable for gfp_mask */ |
1da177e4 | 1483 | |
7fb1d9fc | 1484 | if (unlikely(*z == NULL)) { |
523b9458 CL |
1485 | /* |
1486 | * Happens if we have an empty zonelist as a result of | |
1487 | * GFP_THISNODE being used on a memoryless node | |
1488 | */ | |
1da177e4 LT |
1489 | return NULL; |
1490 | } | |
6b1de916 | 1491 | |
7fb1d9fc | 1492 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order, |
3148890b | 1493 | zonelist, ALLOC_WMARK_LOW|ALLOC_CPUSET); |
7fb1d9fc RS |
1494 | if (page) |
1495 | goto got_pg; | |
1da177e4 | 1496 | |
952f3b51 CL |
1497 | /* |
1498 | * GFP_THISNODE (meaning __GFP_THISNODE, __GFP_NORETRY and | |
1499 | * __GFP_NOWARN set) should not cause reclaim since the subsystem | |
1500 | * (f.e. slab) using GFP_THISNODE may choose to trigger reclaim | |
1501 | * using a larger set of nodes after it has established that the | |
1502 | * allowed per node queues are empty and that nodes are | |
1503 | * over allocated. | |
1504 | */ | |
1505 | if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE) | |
1506 | goto nopage; | |
1507 | ||
0798e519 | 1508 | for (z = zonelist->zones; *z; z++) |
43b0bc00 | 1509 | wakeup_kswapd(*z, order); |
1da177e4 | 1510 | |
9bf2229f | 1511 | /* |
7fb1d9fc RS |
1512 | * OK, we're below the kswapd watermark and have kicked background |
1513 | * reclaim. Now things get more complex, so set up alloc_flags according | |
1514 | * to how we want to proceed. | |
1515 | * | |
1516 | * The caller may dip into page reserves a bit more if the caller | |
1517 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
4eac915d PJ |
1518 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will |
1519 | * set both ALLOC_HARDER (!wait) and ALLOC_HIGH (__GFP_HIGH). | |
9bf2229f | 1520 | */ |
3148890b | 1521 | alloc_flags = ALLOC_WMARK_MIN; |
7fb1d9fc RS |
1522 | if ((unlikely(rt_task(p)) && !in_interrupt()) || !wait) |
1523 | alloc_flags |= ALLOC_HARDER; | |
1524 | if (gfp_mask & __GFP_HIGH) | |
1525 | alloc_flags |= ALLOC_HIGH; | |
bdd804f4 PJ |
1526 | if (wait) |
1527 | alloc_flags |= ALLOC_CPUSET; | |
1da177e4 LT |
1528 | |
1529 | /* | |
1530 | * Go through the zonelist again. Let __GFP_HIGH and allocations | |
7fb1d9fc | 1531 | * coming from realtime tasks go deeper into reserves. |
1da177e4 LT |
1532 | * |
1533 | * This is the last chance, in general, before the goto nopage. | |
1534 | * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc. | |
9bf2229f | 1535 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. |
1da177e4 | 1536 | */ |
7fb1d9fc RS |
1537 | page = get_page_from_freelist(gfp_mask, order, zonelist, alloc_flags); |
1538 | if (page) | |
1539 | goto got_pg; | |
1da177e4 LT |
1540 | |
1541 | /* This allocation should allow future memory freeing. */ | |
b84a35be | 1542 | |
b43a57bb | 1543 | rebalance: |
b84a35be NP |
1544 | if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE))) |
1545 | && !in_interrupt()) { | |
1546 | if (!(gfp_mask & __GFP_NOMEMALLOC)) { | |
885036d3 | 1547 | nofail_alloc: |
b84a35be | 1548 | /* go through the zonelist yet again, ignoring mins */ |
7fb1d9fc | 1549 | page = get_page_from_freelist(gfp_mask, order, |
47f3a867 | 1550 | zonelist, ALLOC_NO_WATERMARKS); |
7fb1d9fc RS |
1551 | if (page) |
1552 | goto got_pg; | |
885036d3 | 1553 | if (gfp_mask & __GFP_NOFAIL) { |
3fcfab16 | 1554 | congestion_wait(WRITE, HZ/50); |
885036d3 KK |
1555 | goto nofail_alloc; |
1556 | } | |
1da177e4 LT |
1557 | } |
1558 | goto nopage; | |
1559 | } | |
1560 | ||
1561 | /* Atomic allocations - we can't balance anything */ | |
1562 | if (!wait) | |
1563 | goto nopage; | |
1564 | ||
1da177e4 LT |
1565 | cond_resched(); |
1566 | ||
1567 | /* We now go into synchronous reclaim */ | |
3e0d98b9 | 1568 | cpuset_memory_pressure_bump(); |
1da177e4 LT |
1569 | p->flags |= PF_MEMALLOC; |
1570 | reclaim_state.reclaimed_slab = 0; | |
1571 | p->reclaim_state = &reclaim_state; | |
1572 | ||
5ad333eb | 1573 | did_some_progress = try_to_free_pages(zonelist->zones, order, gfp_mask); |
1da177e4 LT |
1574 | |
1575 | p->reclaim_state = NULL; | |
1576 | p->flags &= ~PF_MEMALLOC; | |
1577 | ||
1578 | cond_resched(); | |
1579 | ||
e2c55dc8 MG |
1580 | if (order != 0) |
1581 | drain_all_local_pages(); | |
1582 | ||
1da177e4 | 1583 | if (likely(did_some_progress)) { |
7fb1d9fc RS |
1584 | page = get_page_from_freelist(gfp_mask, order, |
1585 | zonelist, alloc_flags); | |
1586 | if (page) | |
1587 | goto got_pg; | |
1da177e4 LT |
1588 | } else if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) { |
1589 | /* | |
1590 | * Go through the zonelist yet one more time, keep | |
1591 | * very high watermark here, this is only to catch | |
1592 | * a parallel oom killing, we must fail if we're still | |
1593 | * under heavy pressure. | |
1594 | */ | |
7fb1d9fc | 1595 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order, |
3148890b | 1596 | zonelist, ALLOC_WMARK_HIGH|ALLOC_CPUSET); |
7fb1d9fc RS |
1597 | if (page) |
1598 | goto got_pg; | |
1da177e4 | 1599 | |
a8bbf72a MG |
1600 | /* The OOM killer will not help higher order allocs so fail */ |
1601 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
1602 | goto nopage; | |
1603 | ||
9b0f8b04 | 1604 | out_of_memory(zonelist, gfp_mask, order); |
1da177e4 LT |
1605 | goto restart; |
1606 | } | |
1607 | ||
1608 | /* | |
1609 | * Don't let big-order allocations loop unless the caller explicitly | |
1610 | * requests that. Wait for some write requests to complete then retry. | |
1611 | * | |
1612 | * In this implementation, __GFP_REPEAT means __GFP_NOFAIL for order | |
1613 | * <= 3, but that may not be true in other implementations. | |
1614 | */ | |
1615 | do_retry = 0; | |
1616 | if (!(gfp_mask & __GFP_NORETRY)) { | |
5ad333eb AW |
1617 | if ((order <= PAGE_ALLOC_COSTLY_ORDER) || |
1618 | (gfp_mask & __GFP_REPEAT)) | |
1da177e4 LT |
1619 | do_retry = 1; |
1620 | if (gfp_mask & __GFP_NOFAIL) | |
1621 | do_retry = 1; | |
1622 | } | |
1623 | if (do_retry) { | |
3fcfab16 | 1624 | congestion_wait(WRITE, HZ/50); |
1da177e4 LT |
1625 | goto rebalance; |
1626 | } | |
1627 | ||
1628 | nopage: | |
1629 | if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) { | |
1630 | printk(KERN_WARNING "%s: page allocation failure." | |
1631 | " order:%d, mode:0x%x\n", | |
1632 | p->comm, order, gfp_mask); | |
1633 | dump_stack(); | |
578c2fd6 | 1634 | show_mem(); |
1da177e4 | 1635 | } |
1da177e4 | 1636 | got_pg: |
1da177e4 LT |
1637 | return page; |
1638 | } | |
1639 | ||
1640 | EXPORT_SYMBOL(__alloc_pages); | |
1641 | ||
1642 | /* | |
1643 | * Common helper functions. | |
1644 | */ | |
dd0fc66f | 1645 | fastcall unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 LT |
1646 | { |
1647 | struct page * page; | |
1648 | page = alloc_pages(gfp_mask, order); | |
1649 | if (!page) | |
1650 | return 0; | |
1651 | return (unsigned long) page_address(page); | |
1652 | } | |
1653 | ||
1654 | EXPORT_SYMBOL(__get_free_pages); | |
1655 | ||
dd0fc66f | 1656 | fastcall unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 LT |
1657 | { |
1658 | struct page * page; | |
1659 | ||
1660 | /* | |
1661 | * get_zeroed_page() returns a 32-bit address, which cannot represent | |
1662 | * a highmem page | |
1663 | */ | |
725d704e | 1664 | VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); |
1da177e4 LT |
1665 | |
1666 | page = alloc_pages(gfp_mask | __GFP_ZERO, 0); | |
1667 | if (page) | |
1668 | return (unsigned long) page_address(page); | |
1669 | return 0; | |
1670 | } | |
1671 | ||
1672 | EXPORT_SYMBOL(get_zeroed_page); | |
1673 | ||
1674 | void __pagevec_free(struct pagevec *pvec) | |
1675 | { | |
1676 | int i = pagevec_count(pvec); | |
1677 | ||
1678 | while (--i >= 0) | |
1679 | free_hot_cold_page(pvec->pages[i], pvec->cold); | |
1680 | } | |
1681 | ||
1682 | fastcall void __free_pages(struct page *page, unsigned int order) | |
1683 | { | |
b5810039 | 1684 | if (put_page_testzero(page)) { |
1da177e4 LT |
1685 | if (order == 0) |
1686 | free_hot_page(page); | |
1687 | else | |
1688 | __free_pages_ok(page, order); | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | EXPORT_SYMBOL(__free_pages); | |
1693 | ||
1694 | fastcall void free_pages(unsigned long addr, unsigned int order) | |
1695 | { | |
1696 | if (addr != 0) { | |
725d704e | 1697 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
1698 | __free_pages(virt_to_page((void *)addr), order); |
1699 | } | |
1700 | } | |
1701 | ||
1702 | EXPORT_SYMBOL(free_pages); | |
1703 | ||
1da177e4 LT |
1704 | static unsigned int nr_free_zone_pages(int offset) |
1705 | { | |
e310fd43 MB |
1706 | /* Just pick one node, since fallback list is circular */ |
1707 | pg_data_t *pgdat = NODE_DATA(numa_node_id()); | |
1da177e4 LT |
1708 | unsigned int sum = 0; |
1709 | ||
e310fd43 MB |
1710 | struct zonelist *zonelist = pgdat->node_zonelists + offset; |
1711 | struct zone **zonep = zonelist->zones; | |
1712 | struct zone *zone; | |
1da177e4 | 1713 | |
e310fd43 MB |
1714 | for (zone = *zonep++; zone; zone = *zonep++) { |
1715 | unsigned long size = zone->present_pages; | |
1716 | unsigned long high = zone->pages_high; | |
1717 | if (size > high) | |
1718 | sum += size - high; | |
1da177e4 LT |
1719 | } |
1720 | ||
1721 | return sum; | |
1722 | } | |
1723 | ||
1724 | /* | |
1725 | * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL | |
1726 | */ | |
1727 | unsigned int nr_free_buffer_pages(void) | |
1728 | { | |
af4ca457 | 1729 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 1730 | } |
c2f1a551 | 1731 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 LT |
1732 | |
1733 | /* | |
1734 | * Amount of free RAM allocatable within all zones | |
1735 | */ | |
1736 | unsigned int nr_free_pagecache_pages(void) | |
1737 | { | |
2a1e274a | 1738 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
1da177e4 | 1739 | } |
08e0f6a9 CL |
1740 | |
1741 | static inline void show_node(struct zone *zone) | |
1da177e4 | 1742 | { |
08e0f6a9 | 1743 | if (NUMA_BUILD) |
25ba77c1 | 1744 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 1745 | } |
1da177e4 | 1746 | |
1da177e4 LT |
1747 | void si_meminfo(struct sysinfo *val) |
1748 | { | |
1749 | val->totalram = totalram_pages; | |
1750 | val->sharedram = 0; | |
d23ad423 | 1751 | val->freeram = global_page_state(NR_FREE_PAGES); |
1da177e4 | 1752 | val->bufferram = nr_blockdev_pages(); |
1da177e4 LT |
1753 | val->totalhigh = totalhigh_pages; |
1754 | val->freehigh = nr_free_highpages(); | |
1da177e4 LT |
1755 | val->mem_unit = PAGE_SIZE; |
1756 | } | |
1757 | ||
1758 | EXPORT_SYMBOL(si_meminfo); | |
1759 | ||
1760 | #ifdef CONFIG_NUMA | |
1761 | void si_meminfo_node(struct sysinfo *val, int nid) | |
1762 | { | |
1763 | pg_data_t *pgdat = NODE_DATA(nid); | |
1764 | ||
1765 | val->totalram = pgdat->node_present_pages; | |
d23ad423 | 1766 | val->freeram = node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 1767 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 1768 | val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages; |
d23ad423 CL |
1769 | val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM], |
1770 | NR_FREE_PAGES); | |
98d2b0eb CL |
1771 | #else |
1772 | val->totalhigh = 0; | |
1773 | val->freehigh = 0; | |
1774 | #endif | |
1da177e4 LT |
1775 | val->mem_unit = PAGE_SIZE; |
1776 | } | |
1777 | #endif | |
1778 | ||
1779 | #define K(x) ((x) << (PAGE_SHIFT-10)) | |
1780 | ||
1781 | /* | |
1782 | * Show free area list (used inside shift_scroll-lock stuff) | |
1783 | * We also calculate the percentage fragmentation. We do this by counting the | |
1784 | * memory on each free list with the exception of the first item on the list. | |
1785 | */ | |
1786 | void show_free_areas(void) | |
1787 | { | |
c7241913 | 1788 | int cpu; |
1da177e4 LT |
1789 | struct zone *zone; |
1790 | ||
1791 | for_each_zone(zone) { | |
c7241913 | 1792 | if (!populated_zone(zone)) |
1da177e4 | 1793 | continue; |
c7241913 JS |
1794 | |
1795 | show_node(zone); | |
1796 | printk("%s per-cpu:\n", zone->name); | |
1da177e4 | 1797 | |
6b482c67 | 1798 | for_each_online_cpu(cpu) { |
1da177e4 LT |
1799 | struct per_cpu_pageset *pageset; |
1800 | ||
e7c8d5c9 | 1801 | pageset = zone_pcp(zone, cpu); |
1da177e4 | 1802 | |
c7241913 JS |
1803 | printk("CPU %4d: Hot: hi:%5d, btch:%4d usd:%4d " |
1804 | "Cold: hi:%5d, btch:%4d usd:%4d\n", | |
1805 | cpu, pageset->pcp[0].high, | |
1806 | pageset->pcp[0].batch, pageset->pcp[0].count, | |
1807 | pageset->pcp[1].high, pageset->pcp[1].batch, | |
1808 | pageset->pcp[1].count); | |
1da177e4 LT |
1809 | } |
1810 | } | |
1811 | ||
a25700a5 | 1812 | printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n" |
d23ad423 | 1813 | " free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n", |
65e458d4 CL |
1814 | global_page_state(NR_ACTIVE), |
1815 | global_page_state(NR_INACTIVE), | |
b1e7a8fd | 1816 | global_page_state(NR_FILE_DIRTY), |
ce866b34 | 1817 | global_page_state(NR_WRITEBACK), |
fd39fc85 | 1818 | global_page_state(NR_UNSTABLE_NFS), |
d23ad423 | 1819 | global_page_state(NR_FREE_PAGES), |
972d1a7b CL |
1820 | global_page_state(NR_SLAB_RECLAIMABLE) + |
1821 | global_page_state(NR_SLAB_UNRECLAIMABLE), | |
65ba55f5 | 1822 | global_page_state(NR_FILE_MAPPED), |
a25700a5 AM |
1823 | global_page_state(NR_PAGETABLE), |
1824 | global_page_state(NR_BOUNCE)); | |
1da177e4 LT |
1825 | |
1826 | for_each_zone(zone) { | |
1827 | int i; | |
1828 | ||
c7241913 JS |
1829 | if (!populated_zone(zone)) |
1830 | continue; | |
1831 | ||
1da177e4 LT |
1832 | show_node(zone); |
1833 | printk("%s" | |
1834 | " free:%lukB" | |
1835 | " min:%lukB" | |
1836 | " low:%lukB" | |
1837 | " high:%lukB" | |
1838 | " active:%lukB" | |
1839 | " inactive:%lukB" | |
1840 | " present:%lukB" | |
1841 | " pages_scanned:%lu" | |
1842 | " all_unreclaimable? %s" | |
1843 | "\n", | |
1844 | zone->name, | |
d23ad423 | 1845 | K(zone_page_state(zone, NR_FREE_PAGES)), |
1da177e4 LT |
1846 | K(zone->pages_min), |
1847 | K(zone->pages_low), | |
1848 | K(zone->pages_high), | |
c8785385 CL |
1849 | K(zone_page_state(zone, NR_ACTIVE)), |
1850 | K(zone_page_state(zone, NR_INACTIVE)), | |
1da177e4 LT |
1851 | K(zone->present_pages), |
1852 | zone->pages_scanned, | |
1853 | (zone->all_unreclaimable ? "yes" : "no") | |
1854 | ); | |
1855 | printk("lowmem_reserve[]:"); | |
1856 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1857 | printk(" %lu", zone->lowmem_reserve[i]); | |
1858 | printk("\n"); | |
1859 | } | |
1860 | ||
1861 | for_each_zone(zone) { | |
8f9de51a | 1862 | unsigned long nr[MAX_ORDER], flags, order, total = 0; |
1da177e4 | 1863 | |
c7241913 JS |
1864 | if (!populated_zone(zone)) |
1865 | continue; | |
1866 | ||
1da177e4 LT |
1867 | show_node(zone); |
1868 | printk("%s: ", zone->name); | |
1da177e4 LT |
1869 | |
1870 | spin_lock_irqsave(&zone->lock, flags); | |
1871 | for (order = 0; order < MAX_ORDER; order++) { | |
8f9de51a KK |
1872 | nr[order] = zone->free_area[order].nr_free; |
1873 | total += nr[order] << order; | |
1da177e4 LT |
1874 | } |
1875 | spin_unlock_irqrestore(&zone->lock, flags); | |
8f9de51a KK |
1876 | for (order = 0; order < MAX_ORDER; order++) |
1877 | printk("%lu*%lukB ", nr[order], K(1UL) << order); | |
1da177e4 LT |
1878 | printk("= %lukB\n", K(total)); |
1879 | } | |
1880 | ||
1881 | show_swap_cache_info(); | |
1882 | } | |
1883 | ||
1884 | /* | |
1885 | * Builds allocation fallback zone lists. | |
1a93205b CL |
1886 | * |
1887 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 1888 | */ |
f0c0b2b8 KH |
1889 | static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, |
1890 | int nr_zones, enum zone_type zone_type) | |
1da177e4 | 1891 | { |
1a93205b CL |
1892 | struct zone *zone; |
1893 | ||
98d2b0eb | 1894 | BUG_ON(zone_type >= MAX_NR_ZONES); |
2f6726e5 | 1895 | zone_type++; |
02a68a5e CL |
1896 | |
1897 | do { | |
2f6726e5 | 1898 | zone_type--; |
070f8032 | 1899 | zone = pgdat->node_zones + zone_type; |
1a93205b | 1900 | if (populated_zone(zone)) { |
070f8032 CL |
1901 | zonelist->zones[nr_zones++] = zone; |
1902 | check_highest_zone(zone_type); | |
1da177e4 | 1903 | } |
02a68a5e | 1904 | |
2f6726e5 | 1905 | } while (zone_type); |
070f8032 | 1906 | return nr_zones; |
1da177e4 LT |
1907 | } |
1908 | ||
f0c0b2b8 KH |
1909 | |
1910 | /* | |
1911 | * zonelist_order: | |
1912 | * 0 = automatic detection of better ordering. | |
1913 | * 1 = order by ([node] distance, -zonetype) | |
1914 | * 2 = order by (-zonetype, [node] distance) | |
1915 | * | |
1916 | * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create | |
1917 | * the same zonelist. So only NUMA can configure this param. | |
1918 | */ | |
1919 | #define ZONELIST_ORDER_DEFAULT 0 | |
1920 | #define ZONELIST_ORDER_NODE 1 | |
1921 | #define ZONELIST_ORDER_ZONE 2 | |
1922 | ||
1923 | /* zonelist order in the kernel. | |
1924 | * set_zonelist_order() will set this to NODE or ZONE. | |
1925 | */ | |
1926 | static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
1927 | static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; | |
1928 | ||
1929 | ||
1da177e4 | 1930 | #ifdef CONFIG_NUMA |
f0c0b2b8 KH |
1931 | /* The value user specified ....changed by config */ |
1932 | static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
1933 | /* string for sysctl */ | |
1934 | #define NUMA_ZONELIST_ORDER_LEN 16 | |
1935 | char numa_zonelist_order[16] = "default"; | |
1936 | ||
1937 | /* | |
1938 | * interface for configure zonelist ordering. | |
1939 | * command line option "numa_zonelist_order" | |
1940 | * = "[dD]efault - default, automatic configuration. | |
1941 | * = "[nN]ode - order by node locality, then by zone within node | |
1942 | * = "[zZ]one - order by zone, then by locality within zone | |
1943 | */ | |
1944 | ||
1945 | static int __parse_numa_zonelist_order(char *s) | |
1946 | { | |
1947 | if (*s == 'd' || *s == 'D') { | |
1948 | user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
1949 | } else if (*s == 'n' || *s == 'N') { | |
1950 | user_zonelist_order = ZONELIST_ORDER_NODE; | |
1951 | } else if (*s == 'z' || *s == 'Z') { | |
1952 | user_zonelist_order = ZONELIST_ORDER_ZONE; | |
1953 | } else { | |
1954 | printk(KERN_WARNING | |
1955 | "Ignoring invalid numa_zonelist_order value: " | |
1956 | "%s\n", s); | |
1957 | return -EINVAL; | |
1958 | } | |
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | static __init int setup_numa_zonelist_order(char *s) | |
1963 | { | |
1964 | if (s) | |
1965 | return __parse_numa_zonelist_order(s); | |
1966 | return 0; | |
1967 | } | |
1968 | early_param("numa_zonelist_order", setup_numa_zonelist_order); | |
1969 | ||
1970 | /* | |
1971 | * sysctl handler for numa_zonelist_order | |
1972 | */ | |
1973 | int numa_zonelist_order_handler(ctl_table *table, int write, | |
1974 | struct file *file, void __user *buffer, size_t *length, | |
1975 | loff_t *ppos) | |
1976 | { | |
1977 | char saved_string[NUMA_ZONELIST_ORDER_LEN]; | |
1978 | int ret; | |
1979 | ||
1980 | if (write) | |
1981 | strncpy(saved_string, (char*)table->data, | |
1982 | NUMA_ZONELIST_ORDER_LEN); | |
1983 | ret = proc_dostring(table, write, file, buffer, length, ppos); | |
1984 | if (ret) | |
1985 | return ret; | |
1986 | if (write) { | |
1987 | int oldval = user_zonelist_order; | |
1988 | if (__parse_numa_zonelist_order((char*)table->data)) { | |
1989 | /* | |
1990 | * bogus value. restore saved string | |
1991 | */ | |
1992 | strncpy((char*)table->data, saved_string, | |
1993 | NUMA_ZONELIST_ORDER_LEN); | |
1994 | user_zonelist_order = oldval; | |
1995 | } else if (oldval != user_zonelist_order) | |
1996 | build_all_zonelists(); | |
1997 | } | |
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | ||
1da177e4 | 2002 | #define MAX_NODE_LOAD (num_online_nodes()) |
f0c0b2b8 KH |
2003 | static int node_load[MAX_NUMNODES]; |
2004 | ||
1da177e4 | 2005 | /** |
4dc3b16b | 2006 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
2007 | * @node: node whose fallback list we're appending |
2008 | * @used_node_mask: nodemask_t of already used nodes | |
2009 | * | |
2010 | * We use a number of factors to determine which is the next node that should | |
2011 | * appear on a given node's fallback list. The node should not have appeared | |
2012 | * already in @node's fallback list, and it should be the next closest node | |
2013 | * according to the distance array (which contains arbitrary distance values | |
2014 | * from each node to each node in the system), and should also prefer nodes | |
2015 | * with no CPUs, since presumably they'll have very little allocation pressure | |
2016 | * on them otherwise. | |
2017 | * It returns -1 if no node is found. | |
2018 | */ | |
f0c0b2b8 | 2019 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 2020 | { |
4cf808eb | 2021 | int n, val; |
1da177e4 LT |
2022 | int min_val = INT_MAX; |
2023 | int best_node = -1; | |
2024 | ||
4cf808eb LT |
2025 | /* Use the local node if we haven't already */ |
2026 | if (!node_isset(node, *used_node_mask)) { | |
2027 | node_set(node, *used_node_mask); | |
2028 | return node; | |
2029 | } | |
1da177e4 | 2030 | |
37b07e41 | 2031 | for_each_node_state(n, N_HIGH_MEMORY) { |
4cf808eb | 2032 | cpumask_t tmp; |
1da177e4 LT |
2033 | |
2034 | /* Don't want a node to appear more than once */ | |
2035 | if (node_isset(n, *used_node_mask)) | |
2036 | continue; | |
2037 | ||
1da177e4 LT |
2038 | /* Use the distance array to find the distance */ |
2039 | val = node_distance(node, n); | |
2040 | ||
4cf808eb LT |
2041 | /* Penalize nodes under us ("prefer the next node") */ |
2042 | val += (n < node); | |
2043 | ||
1da177e4 LT |
2044 | /* Give preference to headless and unused nodes */ |
2045 | tmp = node_to_cpumask(n); | |
2046 | if (!cpus_empty(tmp)) | |
2047 | val += PENALTY_FOR_NODE_WITH_CPUS; | |
2048 | ||
2049 | /* Slight preference for less loaded node */ | |
2050 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
2051 | val += node_load[n]; | |
2052 | ||
2053 | if (val < min_val) { | |
2054 | min_val = val; | |
2055 | best_node = n; | |
2056 | } | |
2057 | } | |
2058 | ||
2059 | if (best_node >= 0) | |
2060 | node_set(best_node, *used_node_mask); | |
2061 | ||
2062 | return best_node; | |
2063 | } | |
2064 | ||
f0c0b2b8 KH |
2065 | |
2066 | /* | |
2067 | * Build zonelists ordered by node and zones within node. | |
2068 | * This results in maximum locality--normal zone overflows into local | |
2069 | * DMA zone, if any--but risks exhausting DMA zone. | |
2070 | */ | |
2071 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) | |
1da177e4 | 2072 | { |
19655d34 | 2073 | enum zone_type i; |
f0c0b2b8 | 2074 | int j; |
1da177e4 | 2075 | struct zonelist *zonelist; |
f0c0b2b8 KH |
2076 | |
2077 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2078 | zonelist = pgdat->node_zonelists + i; | |
2079 | for (j = 0; zonelist->zones[j] != NULL; j++) | |
2080 | ; | |
2081 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, i); | |
2082 | zonelist->zones[j] = NULL; | |
2083 | } | |
2084 | } | |
2085 | ||
523b9458 CL |
2086 | /* |
2087 | * Build gfp_thisnode zonelists | |
2088 | */ | |
2089 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
2090 | { | |
2091 | enum zone_type i; | |
2092 | int j; | |
2093 | struct zonelist *zonelist; | |
2094 | ||
2095 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2096 | zonelist = pgdat->node_zonelists + MAX_NR_ZONES + i; | |
2097 | j = build_zonelists_node(pgdat, zonelist, 0, i); | |
2098 | zonelist->zones[j] = NULL; | |
2099 | } | |
2100 | } | |
2101 | ||
f0c0b2b8 KH |
2102 | /* |
2103 | * Build zonelists ordered by zone and nodes within zones. | |
2104 | * This results in conserving DMA zone[s] until all Normal memory is | |
2105 | * exhausted, but results in overflowing to remote node while memory | |
2106 | * may still exist in local DMA zone. | |
2107 | */ | |
2108 | static int node_order[MAX_NUMNODES]; | |
2109 | ||
2110 | static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) | |
2111 | { | |
2112 | enum zone_type i; | |
2113 | int pos, j, node; | |
2114 | int zone_type; /* needs to be signed */ | |
2115 | struct zone *z; | |
2116 | struct zonelist *zonelist; | |
2117 | ||
2118 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2119 | zonelist = pgdat->node_zonelists + i; | |
2120 | pos = 0; | |
2121 | for (zone_type = i; zone_type >= 0; zone_type--) { | |
2122 | for (j = 0; j < nr_nodes; j++) { | |
2123 | node = node_order[j]; | |
2124 | z = &NODE_DATA(node)->node_zones[zone_type]; | |
2125 | if (populated_zone(z)) { | |
2126 | zonelist->zones[pos++] = z; | |
2127 | check_highest_zone(zone_type); | |
2128 | } | |
2129 | } | |
2130 | } | |
2131 | zonelist->zones[pos] = NULL; | |
2132 | } | |
2133 | } | |
2134 | ||
2135 | static int default_zonelist_order(void) | |
2136 | { | |
2137 | int nid, zone_type; | |
2138 | unsigned long low_kmem_size,total_size; | |
2139 | struct zone *z; | |
2140 | int average_size; | |
2141 | /* | |
2142 | * ZONE_DMA and ZONE_DMA32 can be very small area in the sytem. | |
2143 | * If they are really small and used heavily, the system can fall | |
2144 | * into OOM very easily. | |
2145 | * This function detect ZONE_DMA/DMA32 size and confgigures zone order. | |
2146 | */ | |
2147 | /* Is there ZONE_NORMAL ? (ex. ppc has only DMA zone..) */ | |
2148 | low_kmem_size = 0; | |
2149 | total_size = 0; | |
2150 | for_each_online_node(nid) { | |
2151 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { | |
2152 | z = &NODE_DATA(nid)->node_zones[zone_type]; | |
2153 | if (populated_zone(z)) { | |
2154 | if (zone_type < ZONE_NORMAL) | |
2155 | low_kmem_size += z->present_pages; | |
2156 | total_size += z->present_pages; | |
2157 | } | |
2158 | } | |
2159 | } | |
2160 | if (!low_kmem_size || /* there are no DMA area. */ | |
2161 | low_kmem_size > total_size/2) /* DMA/DMA32 is big. */ | |
2162 | return ZONELIST_ORDER_NODE; | |
2163 | /* | |
2164 | * look into each node's config. | |
2165 | * If there is a node whose DMA/DMA32 memory is very big area on | |
2166 | * local memory, NODE_ORDER may be suitable. | |
2167 | */ | |
37b07e41 LS |
2168 | average_size = total_size / |
2169 | (nodes_weight(node_states[N_HIGH_MEMORY]) + 1); | |
f0c0b2b8 KH |
2170 | for_each_online_node(nid) { |
2171 | low_kmem_size = 0; | |
2172 | total_size = 0; | |
2173 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { | |
2174 | z = &NODE_DATA(nid)->node_zones[zone_type]; | |
2175 | if (populated_zone(z)) { | |
2176 | if (zone_type < ZONE_NORMAL) | |
2177 | low_kmem_size += z->present_pages; | |
2178 | total_size += z->present_pages; | |
2179 | } | |
2180 | } | |
2181 | if (low_kmem_size && | |
2182 | total_size > average_size && /* ignore small node */ | |
2183 | low_kmem_size > total_size * 70/100) | |
2184 | return ZONELIST_ORDER_NODE; | |
2185 | } | |
2186 | return ZONELIST_ORDER_ZONE; | |
2187 | } | |
2188 | ||
2189 | static void set_zonelist_order(void) | |
2190 | { | |
2191 | if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) | |
2192 | current_zonelist_order = default_zonelist_order(); | |
2193 | else | |
2194 | current_zonelist_order = user_zonelist_order; | |
2195 | } | |
2196 | ||
2197 | static void build_zonelists(pg_data_t *pgdat) | |
2198 | { | |
2199 | int j, node, load; | |
2200 | enum zone_type i; | |
1da177e4 | 2201 | nodemask_t used_mask; |
f0c0b2b8 KH |
2202 | int local_node, prev_node; |
2203 | struct zonelist *zonelist; | |
2204 | int order = current_zonelist_order; | |
1da177e4 LT |
2205 | |
2206 | /* initialize zonelists */ | |
523b9458 | 2207 | for (i = 0; i < MAX_ZONELISTS; i++) { |
1da177e4 LT |
2208 | zonelist = pgdat->node_zonelists + i; |
2209 | zonelist->zones[0] = NULL; | |
2210 | } | |
2211 | ||
2212 | /* NUMA-aware ordering of nodes */ | |
2213 | local_node = pgdat->node_id; | |
2214 | load = num_online_nodes(); | |
2215 | prev_node = local_node; | |
2216 | nodes_clear(used_mask); | |
f0c0b2b8 KH |
2217 | |
2218 | memset(node_load, 0, sizeof(node_load)); | |
2219 | memset(node_order, 0, sizeof(node_order)); | |
2220 | j = 0; | |
2221 | ||
1da177e4 | 2222 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
9eeff239 CL |
2223 | int distance = node_distance(local_node, node); |
2224 | ||
2225 | /* | |
2226 | * If another node is sufficiently far away then it is better | |
2227 | * to reclaim pages in a zone before going off node. | |
2228 | */ | |
2229 | if (distance > RECLAIM_DISTANCE) | |
2230 | zone_reclaim_mode = 1; | |
2231 | ||
1da177e4 LT |
2232 | /* |
2233 | * We don't want to pressure a particular node. | |
2234 | * So adding penalty to the first node in same | |
2235 | * distance group to make it round-robin. | |
2236 | */ | |
9eeff239 | 2237 | if (distance != node_distance(local_node, prev_node)) |
f0c0b2b8 KH |
2238 | node_load[node] = load; |
2239 | ||
1da177e4 LT |
2240 | prev_node = node; |
2241 | load--; | |
f0c0b2b8 KH |
2242 | if (order == ZONELIST_ORDER_NODE) |
2243 | build_zonelists_in_node_order(pgdat, node); | |
2244 | else | |
2245 | node_order[j++] = node; /* remember order */ | |
2246 | } | |
1da177e4 | 2247 | |
f0c0b2b8 KH |
2248 | if (order == ZONELIST_ORDER_ZONE) { |
2249 | /* calculate node order -- i.e., DMA last! */ | |
2250 | build_zonelists_in_zone_order(pgdat, j); | |
1da177e4 | 2251 | } |
523b9458 CL |
2252 | |
2253 | build_thisnode_zonelists(pgdat); | |
1da177e4 LT |
2254 | } |
2255 | ||
9276b1bc | 2256 | /* Construct the zonelist performance cache - see further mmzone.h */ |
f0c0b2b8 | 2257 | static void build_zonelist_cache(pg_data_t *pgdat) |
9276b1bc PJ |
2258 | { |
2259 | int i; | |
2260 | ||
2261 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2262 | struct zonelist *zonelist; | |
2263 | struct zonelist_cache *zlc; | |
2264 | struct zone **z; | |
2265 | ||
2266 | zonelist = pgdat->node_zonelists + i; | |
2267 | zonelist->zlcache_ptr = zlc = &zonelist->zlcache; | |
2268 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); | |
2269 | for (z = zonelist->zones; *z; z++) | |
2270 | zlc->z_to_n[z - zonelist->zones] = zone_to_nid(*z); | |
2271 | } | |
2272 | } | |
2273 | ||
f0c0b2b8 | 2274 | |
1da177e4 LT |
2275 | #else /* CONFIG_NUMA */ |
2276 | ||
f0c0b2b8 KH |
2277 | static void set_zonelist_order(void) |
2278 | { | |
2279 | current_zonelist_order = ZONELIST_ORDER_ZONE; | |
2280 | } | |
2281 | ||
2282 | static void build_zonelists(pg_data_t *pgdat) | |
1da177e4 | 2283 | { |
19655d34 CL |
2284 | int node, local_node; |
2285 | enum zone_type i,j; | |
1da177e4 LT |
2286 | |
2287 | local_node = pgdat->node_id; | |
19655d34 | 2288 | for (i = 0; i < MAX_NR_ZONES; i++) { |
1da177e4 LT |
2289 | struct zonelist *zonelist; |
2290 | ||
2291 | zonelist = pgdat->node_zonelists + i; | |
2292 | ||
19655d34 | 2293 | j = build_zonelists_node(pgdat, zonelist, 0, i); |
1da177e4 LT |
2294 | /* |
2295 | * Now we build the zonelist so that it contains the zones | |
2296 | * of all the other nodes. | |
2297 | * We don't want to pressure a particular node, so when | |
2298 | * building the zones for node N, we make sure that the | |
2299 | * zones coming right after the local ones are those from | |
2300 | * node N+1 (modulo N) | |
2301 | */ | |
2302 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
2303 | if (!node_online(node)) | |
2304 | continue; | |
19655d34 | 2305 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, i); |
1da177e4 LT |
2306 | } |
2307 | for (node = 0; node < local_node; node++) { | |
2308 | if (!node_online(node)) | |
2309 | continue; | |
19655d34 | 2310 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, i); |
1da177e4 LT |
2311 | } |
2312 | ||
2313 | zonelist->zones[j] = NULL; | |
2314 | } | |
2315 | } | |
2316 | ||
9276b1bc | 2317 | /* non-NUMA variant of zonelist performance cache - just NULL zlcache_ptr */ |
f0c0b2b8 | 2318 | static void build_zonelist_cache(pg_data_t *pgdat) |
9276b1bc PJ |
2319 | { |
2320 | int i; | |
2321 | ||
2322 | for (i = 0; i < MAX_NR_ZONES; i++) | |
2323 | pgdat->node_zonelists[i].zlcache_ptr = NULL; | |
2324 | } | |
2325 | ||
1da177e4 LT |
2326 | #endif /* CONFIG_NUMA */ |
2327 | ||
6811378e | 2328 | /* return values int ....just for stop_machine_run() */ |
f0c0b2b8 | 2329 | static int __build_all_zonelists(void *dummy) |
1da177e4 | 2330 | { |
6811378e | 2331 | int nid; |
9276b1bc PJ |
2332 | |
2333 | for_each_online_node(nid) { | |
7ea1530a CL |
2334 | pg_data_t *pgdat = NODE_DATA(nid); |
2335 | ||
2336 | build_zonelists(pgdat); | |
2337 | build_zonelist_cache(pgdat); | |
9276b1bc | 2338 | } |
6811378e YG |
2339 | return 0; |
2340 | } | |
2341 | ||
f0c0b2b8 | 2342 | void build_all_zonelists(void) |
6811378e | 2343 | { |
f0c0b2b8 KH |
2344 | set_zonelist_order(); |
2345 | ||
6811378e | 2346 | if (system_state == SYSTEM_BOOTING) { |
423b41d7 | 2347 | __build_all_zonelists(NULL); |
6811378e YG |
2348 | cpuset_init_current_mems_allowed(); |
2349 | } else { | |
2350 | /* we have to stop all cpus to guaranntee there is no user | |
2351 | of zonelist */ | |
2352 | stop_machine_run(__build_all_zonelists, NULL, NR_CPUS); | |
2353 | /* cpuset refresh routine should be here */ | |
2354 | } | |
bd1e22b8 | 2355 | vm_total_pages = nr_free_pagecache_pages(); |
9ef9acb0 MG |
2356 | /* |
2357 | * Disable grouping by mobility if the number of pages in the | |
2358 | * system is too low to allow the mechanism to work. It would be | |
2359 | * more accurate, but expensive to check per-zone. This check is | |
2360 | * made on memory-hotadd so a system can start with mobility | |
2361 | * disabled and enable it later | |
2362 | */ | |
d9c23400 | 2363 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
2364 | page_group_by_mobility_disabled = 1; |
2365 | else | |
2366 | page_group_by_mobility_disabled = 0; | |
2367 | ||
2368 | printk("Built %i zonelists in %s order, mobility grouping %s. " | |
2369 | "Total pages: %ld\n", | |
f0c0b2b8 KH |
2370 | num_online_nodes(), |
2371 | zonelist_order_name[current_zonelist_order], | |
9ef9acb0 | 2372 | page_group_by_mobility_disabled ? "off" : "on", |
f0c0b2b8 KH |
2373 | vm_total_pages); |
2374 | #ifdef CONFIG_NUMA | |
2375 | printk("Policy zone: %s\n", zone_names[policy_zone]); | |
2376 | #endif | |
1da177e4 LT |
2377 | } |
2378 | ||
2379 | /* | |
2380 | * Helper functions to size the waitqueue hash table. | |
2381 | * Essentially these want to choose hash table sizes sufficiently | |
2382 | * large so that collisions trying to wait on pages are rare. | |
2383 | * But in fact, the number of active page waitqueues on typical | |
2384 | * systems is ridiculously low, less than 200. So this is even | |
2385 | * conservative, even though it seems large. | |
2386 | * | |
2387 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to | |
2388 | * waitqueues, i.e. the size of the waitq table given the number of pages. | |
2389 | */ | |
2390 | #define PAGES_PER_WAITQUEUE 256 | |
2391 | ||
cca448fe | 2392 | #ifndef CONFIG_MEMORY_HOTPLUG |
02b694de | 2393 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
1da177e4 LT |
2394 | { |
2395 | unsigned long size = 1; | |
2396 | ||
2397 | pages /= PAGES_PER_WAITQUEUE; | |
2398 | ||
2399 | while (size < pages) | |
2400 | size <<= 1; | |
2401 | ||
2402 | /* | |
2403 | * Once we have dozens or even hundreds of threads sleeping | |
2404 | * on IO we've got bigger problems than wait queue collision. | |
2405 | * Limit the size of the wait table to a reasonable size. | |
2406 | */ | |
2407 | size = min(size, 4096UL); | |
2408 | ||
2409 | return max(size, 4UL); | |
2410 | } | |
cca448fe YG |
2411 | #else |
2412 | /* | |
2413 | * A zone's size might be changed by hot-add, so it is not possible to determine | |
2414 | * a suitable size for its wait_table. So we use the maximum size now. | |
2415 | * | |
2416 | * The max wait table size = 4096 x sizeof(wait_queue_head_t). ie: | |
2417 | * | |
2418 | * i386 (preemption config) : 4096 x 16 = 64Kbyte. | |
2419 | * ia64, x86-64 (no preemption): 4096 x 20 = 80Kbyte. | |
2420 | * ia64, x86-64 (preemption) : 4096 x 24 = 96Kbyte. | |
2421 | * | |
2422 | * The maximum entries are prepared when a zone's memory is (512K + 256) pages | |
2423 | * or more by the traditional way. (See above). It equals: | |
2424 | * | |
2425 | * i386, x86-64, powerpc(4K page size) : = ( 2G + 1M)byte. | |
2426 | * ia64(16K page size) : = ( 8G + 4M)byte. | |
2427 | * powerpc (64K page size) : = (32G +16M)byte. | |
2428 | */ | |
2429 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) | |
2430 | { | |
2431 | return 4096UL; | |
2432 | } | |
2433 | #endif | |
1da177e4 LT |
2434 | |
2435 | /* | |
2436 | * This is an integer logarithm so that shifts can be used later | |
2437 | * to extract the more random high bits from the multiplicative | |
2438 | * hash function before the remainder is taken. | |
2439 | */ | |
2440 | static inline unsigned long wait_table_bits(unsigned long size) | |
2441 | { | |
2442 | return ffz(~size); | |
2443 | } | |
2444 | ||
2445 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
2446 | ||
56fd56b8 | 2447 | /* |
d9c23400 | 2448 | * Mark a number of pageblocks as MIGRATE_RESERVE. The number |
56fd56b8 MG |
2449 | * of blocks reserved is based on zone->pages_min. The memory within the |
2450 | * reserve will tend to store contiguous free pages. Setting min_free_kbytes | |
2451 | * higher will lead to a bigger reserve which will get freed as contiguous | |
2452 | * blocks as reclaim kicks in | |
2453 | */ | |
2454 | static void setup_zone_migrate_reserve(struct zone *zone) | |
2455 | { | |
2456 | unsigned long start_pfn, pfn, end_pfn; | |
2457 | struct page *page; | |
2458 | unsigned long reserve, block_migratetype; | |
2459 | ||
2460 | /* Get the start pfn, end pfn and the number of blocks to reserve */ | |
2461 | start_pfn = zone->zone_start_pfn; | |
2462 | end_pfn = start_pfn + zone->spanned_pages; | |
d9c23400 MG |
2463 | reserve = roundup(zone->pages_min, pageblock_nr_pages) >> |
2464 | pageblock_order; | |
56fd56b8 | 2465 | |
d9c23400 | 2466 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
56fd56b8 MG |
2467 | if (!pfn_valid(pfn)) |
2468 | continue; | |
2469 | page = pfn_to_page(pfn); | |
2470 | ||
2471 | /* Blocks with reserved pages will never free, skip them. */ | |
2472 | if (PageReserved(page)) | |
2473 | continue; | |
2474 | ||
2475 | block_migratetype = get_pageblock_migratetype(page); | |
2476 | ||
2477 | /* If this block is reserved, account for it */ | |
2478 | if (reserve > 0 && block_migratetype == MIGRATE_RESERVE) { | |
2479 | reserve--; | |
2480 | continue; | |
2481 | } | |
2482 | ||
2483 | /* Suitable for reserving if this block is movable */ | |
2484 | if (reserve > 0 && block_migratetype == MIGRATE_MOVABLE) { | |
2485 | set_pageblock_migratetype(page, MIGRATE_RESERVE); | |
2486 | move_freepages_block(zone, page, MIGRATE_RESERVE); | |
2487 | reserve--; | |
2488 | continue; | |
2489 | } | |
2490 | ||
2491 | /* | |
2492 | * If the reserve is met and this is a previous reserved block, | |
2493 | * take it back | |
2494 | */ | |
2495 | if (block_migratetype == MIGRATE_RESERVE) { | |
2496 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
2497 | move_freepages_block(zone, page, MIGRATE_MOVABLE); | |
2498 | } | |
2499 | } | |
2500 | } | |
ac0e5b7a | 2501 | |
1da177e4 LT |
2502 | /* |
2503 | * Initially all pages are reserved - free ones are freed | |
2504 | * up by free_all_bootmem() once the early boot process is | |
2505 | * done. Non-atomic initialization, single-pass. | |
2506 | */ | |
c09b4240 | 2507 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
a2f3aa02 | 2508 | unsigned long start_pfn, enum memmap_context context) |
1da177e4 | 2509 | { |
1da177e4 | 2510 | struct page *page; |
29751f69 AW |
2511 | unsigned long end_pfn = start_pfn + size; |
2512 | unsigned long pfn; | |
1da177e4 | 2513 | |
cbe8dd4a | 2514 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
a2f3aa02 DH |
2515 | /* |
2516 | * There can be holes in boot-time mem_map[]s | |
2517 | * handed to this function. They do not | |
2518 | * exist on hotplugged memory. | |
2519 | */ | |
2520 | if (context == MEMMAP_EARLY) { | |
2521 | if (!early_pfn_valid(pfn)) | |
2522 | continue; | |
2523 | if (!early_pfn_in_nid(pfn, nid)) | |
2524 | continue; | |
2525 | } | |
d41dee36 AW |
2526 | page = pfn_to_page(pfn); |
2527 | set_page_links(page, zone, nid, pfn); | |
7835e98b | 2528 | init_page_count(page); |
1da177e4 LT |
2529 | reset_page_mapcount(page); |
2530 | SetPageReserved(page); | |
b2a0ac88 MG |
2531 | |
2532 | /* | |
2533 | * Mark the block movable so that blocks are reserved for | |
2534 | * movable at startup. This will force kernel allocations | |
2535 | * to reserve their blocks rather than leaking throughout | |
2536 | * the address space during boot when many long-lived | |
56fd56b8 MG |
2537 | * kernel allocations are made. Later some blocks near |
2538 | * the start are marked MIGRATE_RESERVE by | |
2539 | * setup_zone_migrate_reserve() | |
b2a0ac88 | 2540 | */ |
d9c23400 | 2541 | if ((pfn & (pageblock_nr_pages-1))) |
56fd56b8 | 2542 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
b2a0ac88 | 2543 | |
1da177e4 LT |
2544 | INIT_LIST_HEAD(&page->lru); |
2545 | #ifdef WANT_PAGE_VIRTUAL | |
2546 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
2547 | if (!is_highmem_idx(zone)) | |
3212c6be | 2548 | set_page_address(page, __va(pfn << PAGE_SHIFT)); |
1da177e4 | 2549 | #endif |
1da177e4 LT |
2550 | } |
2551 | } | |
2552 | ||
6ea6e688 PM |
2553 | static void __meminit zone_init_free_lists(struct pglist_data *pgdat, |
2554 | struct zone *zone, unsigned long size) | |
1da177e4 | 2555 | { |
b2a0ac88 MG |
2556 | int order, t; |
2557 | for_each_migratetype_order(order, t) { | |
2558 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
2559 | zone->free_area[order].nr_free = 0; |
2560 | } | |
2561 | } | |
2562 | ||
2563 | #ifndef __HAVE_ARCH_MEMMAP_INIT | |
2564 | #define memmap_init(size, nid, zone, start_pfn) \ | |
a2f3aa02 | 2565 | memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY) |
1da177e4 LT |
2566 | #endif |
2567 | ||
d09c6b80 | 2568 | static int __devinit zone_batchsize(struct zone *zone) |
e7c8d5c9 CL |
2569 | { |
2570 | int batch; | |
2571 | ||
2572 | /* | |
2573 | * The per-cpu-pages pools are set to around 1000th of the | |
ba56e91c | 2574 | * size of the zone. But no more than 1/2 of a meg. |
e7c8d5c9 CL |
2575 | * |
2576 | * OK, so we don't know how big the cache is. So guess. | |
2577 | */ | |
2578 | batch = zone->present_pages / 1024; | |
ba56e91c SR |
2579 | if (batch * PAGE_SIZE > 512 * 1024) |
2580 | batch = (512 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
2581 | batch /= 4; /* We effectively *= 4 below */ |
2582 | if (batch < 1) | |
2583 | batch = 1; | |
2584 | ||
2585 | /* | |
0ceaacc9 NP |
2586 | * Clamp the batch to a 2^n - 1 value. Having a power |
2587 | * of 2 value was found to be more likely to have | |
2588 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 2589 | * |
0ceaacc9 NP |
2590 | * For example if 2 tasks are alternately allocating |
2591 | * batches of pages, one task can end up with a lot | |
2592 | * of pages of one half of the possible page colors | |
2593 | * and the other with pages of the other colors. | |
e7c8d5c9 | 2594 | */ |
0ceaacc9 | 2595 | batch = (1 << (fls(batch + batch/2)-1)) - 1; |
ba56e91c | 2596 | |
e7c8d5c9 CL |
2597 | return batch; |
2598 | } | |
2599 | ||
2caaad41 CL |
2600 | inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
2601 | { | |
2602 | struct per_cpu_pages *pcp; | |
2603 | ||
1c6fe946 MD |
2604 | memset(p, 0, sizeof(*p)); |
2605 | ||
2caaad41 CL |
2606 | pcp = &p->pcp[0]; /* hot */ |
2607 | pcp->count = 0; | |
2caaad41 CL |
2608 | pcp->high = 6 * batch; |
2609 | pcp->batch = max(1UL, 1 * batch); | |
2610 | INIT_LIST_HEAD(&pcp->list); | |
2611 | ||
2612 | pcp = &p->pcp[1]; /* cold*/ | |
2613 | pcp->count = 0; | |
2caaad41 | 2614 | pcp->high = 2 * batch; |
e46a5e28 | 2615 | pcp->batch = max(1UL, batch/2); |
2caaad41 CL |
2616 | INIT_LIST_HEAD(&pcp->list); |
2617 | } | |
2618 | ||
8ad4b1fb RS |
2619 | /* |
2620 | * setup_pagelist_highmark() sets the high water mark for hot per_cpu_pagelist | |
2621 | * to the value high for the pageset p. | |
2622 | */ | |
2623 | ||
2624 | static void setup_pagelist_highmark(struct per_cpu_pageset *p, | |
2625 | unsigned long high) | |
2626 | { | |
2627 | struct per_cpu_pages *pcp; | |
2628 | ||
2629 | pcp = &p->pcp[0]; /* hot list */ | |
2630 | pcp->high = high; | |
2631 | pcp->batch = max(1UL, high/4); | |
2632 | if ((high/4) > (PAGE_SHIFT * 8)) | |
2633 | pcp->batch = PAGE_SHIFT * 8; | |
2634 | } | |
2635 | ||
2636 | ||
e7c8d5c9 CL |
2637 | #ifdef CONFIG_NUMA |
2638 | /* | |
2caaad41 CL |
2639 | * Boot pageset table. One per cpu which is going to be used for all |
2640 | * zones and all nodes. The parameters will be set in such a way | |
2641 | * that an item put on a list will immediately be handed over to | |
2642 | * the buddy list. This is safe since pageset manipulation is done | |
2643 | * with interrupts disabled. | |
2644 | * | |
2645 | * Some NUMA counter updates may also be caught by the boot pagesets. | |
b7c84c6a CL |
2646 | * |
2647 | * The boot_pagesets must be kept even after bootup is complete for | |
2648 | * unused processors and/or zones. They do play a role for bootstrapping | |
2649 | * hotplugged processors. | |
2650 | * | |
2651 | * zoneinfo_show() and maybe other functions do | |
2652 | * not check if the processor is online before following the pageset pointer. | |
2653 | * Other parts of the kernel may not check if the zone is available. | |
2caaad41 | 2654 | */ |
88a2a4ac | 2655 | static struct per_cpu_pageset boot_pageset[NR_CPUS]; |
2caaad41 CL |
2656 | |
2657 | /* | |
2658 | * Dynamically allocate memory for the | |
e7c8d5c9 CL |
2659 | * per cpu pageset array in struct zone. |
2660 | */ | |
6292d9aa | 2661 | static int __cpuinit process_zones(int cpu) |
e7c8d5c9 CL |
2662 | { |
2663 | struct zone *zone, *dzone; | |
37c0708d CL |
2664 | int node = cpu_to_node(cpu); |
2665 | ||
2666 | node_set_state(node, N_CPU); /* this node has a cpu */ | |
e7c8d5c9 CL |
2667 | |
2668 | for_each_zone(zone) { | |
e7c8d5c9 | 2669 | |
66a55030 CL |
2670 | if (!populated_zone(zone)) |
2671 | continue; | |
2672 | ||
23316bc8 | 2673 | zone_pcp(zone, cpu) = kmalloc_node(sizeof(struct per_cpu_pageset), |
37c0708d | 2674 | GFP_KERNEL, node); |
23316bc8 | 2675 | if (!zone_pcp(zone, cpu)) |
e7c8d5c9 | 2676 | goto bad; |
e7c8d5c9 | 2677 | |
23316bc8 | 2678 | setup_pageset(zone_pcp(zone, cpu), zone_batchsize(zone)); |
8ad4b1fb RS |
2679 | |
2680 | if (percpu_pagelist_fraction) | |
2681 | setup_pagelist_highmark(zone_pcp(zone, cpu), | |
2682 | (zone->present_pages / percpu_pagelist_fraction)); | |
e7c8d5c9 CL |
2683 | } |
2684 | ||
2685 | return 0; | |
2686 | bad: | |
2687 | for_each_zone(dzone) { | |
64191688 AM |
2688 | if (!populated_zone(dzone)) |
2689 | continue; | |
e7c8d5c9 CL |
2690 | if (dzone == zone) |
2691 | break; | |
23316bc8 NP |
2692 | kfree(zone_pcp(dzone, cpu)); |
2693 | zone_pcp(dzone, cpu) = NULL; | |
e7c8d5c9 CL |
2694 | } |
2695 | return -ENOMEM; | |
2696 | } | |
2697 | ||
2698 | static inline void free_zone_pagesets(int cpu) | |
2699 | { | |
e7c8d5c9 CL |
2700 | struct zone *zone; |
2701 | ||
2702 | for_each_zone(zone) { | |
2703 | struct per_cpu_pageset *pset = zone_pcp(zone, cpu); | |
2704 | ||
f3ef9ead DR |
2705 | /* Free per_cpu_pageset if it is slab allocated */ |
2706 | if (pset != &boot_pageset[cpu]) | |
2707 | kfree(pset); | |
e7c8d5c9 | 2708 | zone_pcp(zone, cpu) = NULL; |
e7c8d5c9 | 2709 | } |
e7c8d5c9 CL |
2710 | } |
2711 | ||
9c7b216d | 2712 | static int __cpuinit pageset_cpuup_callback(struct notifier_block *nfb, |
e7c8d5c9 CL |
2713 | unsigned long action, |
2714 | void *hcpu) | |
2715 | { | |
2716 | int cpu = (long)hcpu; | |
2717 | int ret = NOTIFY_OK; | |
2718 | ||
2719 | switch (action) { | |
ce421c79 | 2720 | case CPU_UP_PREPARE: |
8bb78442 | 2721 | case CPU_UP_PREPARE_FROZEN: |
ce421c79 AW |
2722 | if (process_zones(cpu)) |
2723 | ret = NOTIFY_BAD; | |
2724 | break; | |
2725 | case CPU_UP_CANCELED: | |
8bb78442 | 2726 | case CPU_UP_CANCELED_FROZEN: |
ce421c79 | 2727 | case CPU_DEAD: |
8bb78442 | 2728 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
2729 | free_zone_pagesets(cpu); |
2730 | break; | |
2731 | default: | |
2732 | break; | |
e7c8d5c9 CL |
2733 | } |
2734 | return ret; | |
2735 | } | |
2736 | ||
74b85f37 | 2737 | static struct notifier_block __cpuinitdata pageset_notifier = |
e7c8d5c9 CL |
2738 | { &pageset_cpuup_callback, NULL, 0 }; |
2739 | ||
78d9955b | 2740 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 CL |
2741 | { |
2742 | int err; | |
2743 | ||
2744 | /* Initialize per_cpu_pageset for cpu 0. | |
2745 | * A cpuup callback will do this for every cpu | |
2746 | * as it comes online | |
2747 | */ | |
2748 | err = process_zones(smp_processor_id()); | |
2749 | BUG_ON(err); | |
2750 | register_cpu_notifier(&pageset_notifier); | |
2751 | } | |
2752 | ||
2753 | #endif | |
2754 | ||
577a32f6 | 2755 | static noinline __init_refok |
cca448fe | 2756 | int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) |
ed8ece2e DH |
2757 | { |
2758 | int i; | |
2759 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe | 2760 | size_t alloc_size; |
ed8ece2e DH |
2761 | |
2762 | /* | |
2763 | * The per-page waitqueue mechanism uses hashed waitqueues | |
2764 | * per zone. | |
2765 | */ | |
02b694de YG |
2766 | zone->wait_table_hash_nr_entries = |
2767 | wait_table_hash_nr_entries(zone_size_pages); | |
2768 | zone->wait_table_bits = | |
2769 | wait_table_bits(zone->wait_table_hash_nr_entries); | |
cca448fe YG |
2770 | alloc_size = zone->wait_table_hash_nr_entries |
2771 | * sizeof(wait_queue_head_t); | |
2772 | ||
2773 | if (system_state == SYSTEM_BOOTING) { | |
2774 | zone->wait_table = (wait_queue_head_t *) | |
2775 | alloc_bootmem_node(pgdat, alloc_size); | |
2776 | } else { | |
2777 | /* | |
2778 | * This case means that a zone whose size was 0 gets new memory | |
2779 | * via memory hot-add. | |
2780 | * But it may be the case that a new node was hot-added. In | |
2781 | * this case vmalloc() will not be able to use this new node's | |
2782 | * memory - this wait_table must be initialized to use this new | |
2783 | * node itself as well. | |
2784 | * To use this new node's memory, further consideration will be | |
2785 | * necessary. | |
2786 | */ | |
8691f3a7 | 2787 | zone->wait_table = vmalloc(alloc_size); |
cca448fe YG |
2788 | } |
2789 | if (!zone->wait_table) | |
2790 | return -ENOMEM; | |
ed8ece2e | 2791 | |
02b694de | 2792 | for(i = 0; i < zone->wait_table_hash_nr_entries; ++i) |
ed8ece2e | 2793 | init_waitqueue_head(zone->wait_table + i); |
cca448fe YG |
2794 | |
2795 | return 0; | |
ed8ece2e DH |
2796 | } |
2797 | ||
c09b4240 | 2798 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e DH |
2799 | { |
2800 | int cpu; | |
2801 | unsigned long batch = zone_batchsize(zone); | |
2802 | ||
2803 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
2804 | #ifdef CONFIG_NUMA | |
2805 | /* Early boot. Slab allocator not functional yet */ | |
23316bc8 | 2806 | zone_pcp(zone, cpu) = &boot_pageset[cpu]; |
ed8ece2e DH |
2807 | setup_pageset(&boot_pageset[cpu],0); |
2808 | #else | |
2809 | setup_pageset(zone_pcp(zone,cpu), batch); | |
2810 | #endif | |
2811 | } | |
f5335c0f AB |
2812 | if (zone->present_pages) |
2813 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n", | |
2814 | zone->name, zone->present_pages, batch); | |
ed8ece2e DH |
2815 | } |
2816 | ||
718127cc YG |
2817 | __meminit int init_currently_empty_zone(struct zone *zone, |
2818 | unsigned long zone_start_pfn, | |
a2f3aa02 DH |
2819 | unsigned long size, |
2820 | enum memmap_context context) | |
ed8ece2e DH |
2821 | { |
2822 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe YG |
2823 | int ret; |
2824 | ret = zone_wait_table_init(zone, size); | |
2825 | if (ret) | |
2826 | return ret; | |
ed8ece2e DH |
2827 | pgdat->nr_zones = zone_idx(zone) + 1; |
2828 | ||
ed8ece2e DH |
2829 | zone->zone_start_pfn = zone_start_pfn; |
2830 | ||
2831 | memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn); | |
2832 | ||
2833 | zone_init_free_lists(pgdat, zone, zone->spanned_pages); | |
718127cc YG |
2834 | |
2835 | return 0; | |
ed8ece2e DH |
2836 | } |
2837 | ||
c713216d MG |
2838 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
2839 | /* | |
2840 | * Basic iterator support. Return the first range of PFNs for a node | |
2841 | * Note: nid == MAX_NUMNODES returns first region regardless of node | |
2842 | */ | |
a3142c8e | 2843 | static int __meminit first_active_region_index_in_nid(int nid) |
c713216d MG |
2844 | { |
2845 | int i; | |
2846 | ||
2847 | for (i = 0; i < nr_nodemap_entries; i++) | |
2848 | if (nid == MAX_NUMNODES || early_node_map[i].nid == nid) | |
2849 | return i; | |
2850 | ||
2851 | return -1; | |
2852 | } | |
2853 | ||
2854 | /* | |
2855 | * Basic iterator support. Return the next active range of PFNs for a node | |
2856 | * Note: nid == MAX_NUMNODES returns next region regardles of node | |
2857 | */ | |
a3142c8e | 2858 | static int __meminit next_active_region_index_in_nid(int index, int nid) |
c713216d MG |
2859 | { |
2860 | for (index = index + 1; index < nr_nodemap_entries; index++) | |
2861 | if (nid == MAX_NUMNODES || early_node_map[index].nid == nid) | |
2862 | return index; | |
2863 | ||
2864 | return -1; | |
2865 | } | |
2866 | ||
2867 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID | |
2868 | /* | |
2869 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
2870 | * Architectures may implement their own version but if add_active_range() | |
2871 | * was used and there are no special requirements, this is a convenient | |
2872 | * alternative | |
2873 | */ | |
6f076f5d | 2874 | int __meminit early_pfn_to_nid(unsigned long pfn) |
c713216d MG |
2875 | { |
2876 | int i; | |
2877 | ||
2878 | for (i = 0; i < nr_nodemap_entries; i++) { | |
2879 | unsigned long start_pfn = early_node_map[i].start_pfn; | |
2880 | unsigned long end_pfn = early_node_map[i].end_pfn; | |
2881 | ||
2882 | if (start_pfn <= pfn && pfn < end_pfn) | |
2883 | return early_node_map[i].nid; | |
2884 | } | |
2885 | ||
2886 | return 0; | |
2887 | } | |
2888 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
2889 | ||
2890 | /* Basic iterator support to walk early_node_map[] */ | |
2891 | #define for_each_active_range_index_in_nid(i, nid) \ | |
2892 | for (i = first_active_region_index_in_nid(nid); i != -1; \ | |
2893 | i = next_active_region_index_in_nid(i, nid)) | |
2894 | ||
2895 | /** | |
2896 | * free_bootmem_with_active_regions - Call free_bootmem_node for each active range | |
88ca3b94 RD |
2897 | * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. |
2898 | * @max_low_pfn: The highest PFN that will be passed to free_bootmem_node | |
c713216d MG |
2899 | * |
2900 | * If an architecture guarantees that all ranges registered with | |
2901 | * add_active_ranges() contain no holes and may be freed, this | |
2902 | * this function may be used instead of calling free_bootmem() manually. | |
2903 | */ | |
2904 | void __init free_bootmem_with_active_regions(int nid, | |
2905 | unsigned long max_low_pfn) | |
2906 | { | |
2907 | int i; | |
2908 | ||
2909 | for_each_active_range_index_in_nid(i, nid) { | |
2910 | unsigned long size_pages = 0; | |
2911 | unsigned long end_pfn = early_node_map[i].end_pfn; | |
2912 | ||
2913 | if (early_node_map[i].start_pfn >= max_low_pfn) | |
2914 | continue; | |
2915 | ||
2916 | if (end_pfn > max_low_pfn) | |
2917 | end_pfn = max_low_pfn; | |
2918 | ||
2919 | size_pages = end_pfn - early_node_map[i].start_pfn; | |
2920 | free_bootmem_node(NODE_DATA(early_node_map[i].nid), | |
2921 | PFN_PHYS(early_node_map[i].start_pfn), | |
2922 | size_pages << PAGE_SHIFT); | |
2923 | } | |
2924 | } | |
2925 | ||
2926 | /** | |
2927 | * sparse_memory_present_with_active_regions - Call memory_present for each active range | |
88ca3b94 | 2928 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
c713216d MG |
2929 | * |
2930 | * If an architecture guarantees that all ranges registered with | |
2931 | * add_active_ranges() contain no holes and may be freed, this | |
88ca3b94 | 2932 | * function may be used instead of calling memory_present() manually. |
c713216d MG |
2933 | */ |
2934 | void __init sparse_memory_present_with_active_regions(int nid) | |
2935 | { | |
2936 | int i; | |
2937 | ||
2938 | for_each_active_range_index_in_nid(i, nid) | |
2939 | memory_present(early_node_map[i].nid, | |
2940 | early_node_map[i].start_pfn, | |
2941 | early_node_map[i].end_pfn); | |
2942 | } | |
2943 | ||
fb01439c MG |
2944 | /** |
2945 | * push_node_boundaries - Push node boundaries to at least the requested boundary | |
2946 | * @nid: The nid of the node to push the boundary for | |
2947 | * @start_pfn: The start pfn of the node | |
2948 | * @end_pfn: The end pfn of the node | |
2949 | * | |
2950 | * In reserve-based hot-add, mem_map is allocated that is unused until hotadd | |
2951 | * time. Specifically, on x86_64, SRAT will report ranges that can potentially | |
2952 | * be hotplugged even though no physical memory exists. This function allows | |
2953 | * an arch to push out the node boundaries so mem_map is allocated that can | |
2954 | * be used later. | |
2955 | */ | |
2956 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE | |
2957 | void __init push_node_boundaries(unsigned int nid, | |
2958 | unsigned long start_pfn, unsigned long end_pfn) | |
2959 | { | |
2960 | printk(KERN_DEBUG "Entering push_node_boundaries(%u, %lu, %lu)\n", | |
2961 | nid, start_pfn, end_pfn); | |
2962 | ||
2963 | /* Initialise the boundary for this node if necessary */ | |
2964 | if (node_boundary_end_pfn[nid] == 0) | |
2965 | node_boundary_start_pfn[nid] = -1UL; | |
2966 | ||
2967 | /* Update the boundaries */ | |
2968 | if (node_boundary_start_pfn[nid] > start_pfn) | |
2969 | node_boundary_start_pfn[nid] = start_pfn; | |
2970 | if (node_boundary_end_pfn[nid] < end_pfn) | |
2971 | node_boundary_end_pfn[nid] = end_pfn; | |
2972 | } | |
2973 | ||
2974 | /* If necessary, push the node boundary out for reserve hotadd */ | |
98011f56 | 2975 | static void __meminit account_node_boundary(unsigned int nid, |
fb01439c MG |
2976 | unsigned long *start_pfn, unsigned long *end_pfn) |
2977 | { | |
2978 | printk(KERN_DEBUG "Entering account_node_boundary(%u, %lu, %lu)\n", | |
2979 | nid, *start_pfn, *end_pfn); | |
2980 | ||
2981 | /* Return if boundary information has not been provided */ | |
2982 | if (node_boundary_end_pfn[nid] == 0) | |
2983 | return; | |
2984 | ||
2985 | /* Check the boundaries and update if necessary */ | |
2986 | if (node_boundary_start_pfn[nid] < *start_pfn) | |
2987 | *start_pfn = node_boundary_start_pfn[nid]; | |
2988 | if (node_boundary_end_pfn[nid] > *end_pfn) | |
2989 | *end_pfn = node_boundary_end_pfn[nid]; | |
2990 | } | |
2991 | #else | |
2992 | void __init push_node_boundaries(unsigned int nid, | |
2993 | unsigned long start_pfn, unsigned long end_pfn) {} | |
2994 | ||
98011f56 | 2995 | static void __meminit account_node_boundary(unsigned int nid, |
fb01439c MG |
2996 | unsigned long *start_pfn, unsigned long *end_pfn) {} |
2997 | #endif | |
2998 | ||
2999 | ||
c713216d MG |
3000 | /** |
3001 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
3002 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
3003 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
3004 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
3005 | * |
3006 | * It returns the start and end page frame of a node based on information | |
3007 | * provided by an arch calling add_active_range(). If called for a node | |
3008 | * with no available memory, a warning is printed and the start and end | |
88ca3b94 | 3009 | * PFNs will be 0. |
c713216d | 3010 | */ |
a3142c8e | 3011 | void __meminit get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
3012 | unsigned long *start_pfn, unsigned long *end_pfn) |
3013 | { | |
3014 | int i; | |
3015 | *start_pfn = -1UL; | |
3016 | *end_pfn = 0; | |
3017 | ||
3018 | for_each_active_range_index_in_nid(i, nid) { | |
3019 | *start_pfn = min(*start_pfn, early_node_map[i].start_pfn); | |
3020 | *end_pfn = max(*end_pfn, early_node_map[i].end_pfn); | |
3021 | } | |
3022 | ||
633c0666 | 3023 | if (*start_pfn == -1UL) |
c713216d | 3024 | *start_pfn = 0; |
fb01439c MG |
3025 | |
3026 | /* Push the node boundaries out if requested */ | |
3027 | account_node_boundary(nid, start_pfn, end_pfn); | |
c713216d MG |
3028 | } |
3029 | ||
2a1e274a MG |
3030 | /* |
3031 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
3032 | * assumption is made that zones within a node are ordered in monotonic | |
3033 | * increasing memory addresses so that the "highest" populated zone is used | |
3034 | */ | |
3035 | void __init find_usable_zone_for_movable(void) | |
3036 | { | |
3037 | int zone_index; | |
3038 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
3039 | if (zone_index == ZONE_MOVABLE) | |
3040 | continue; | |
3041 | ||
3042 | if (arch_zone_highest_possible_pfn[zone_index] > | |
3043 | arch_zone_lowest_possible_pfn[zone_index]) | |
3044 | break; | |
3045 | } | |
3046 | ||
3047 | VM_BUG_ON(zone_index == -1); | |
3048 | movable_zone = zone_index; | |
3049 | } | |
3050 | ||
3051 | /* | |
3052 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
3053 | * because it is sized independant of architecture. Unlike the other zones, | |
3054 | * the starting point for ZONE_MOVABLE is not fixed. It may be different | |
3055 | * in each node depending on the size of each node and how evenly kernelcore | |
3056 | * is distributed. This helper function adjusts the zone ranges | |
3057 | * provided by the architecture for a given node by using the end of the | |
3058 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
3059 | * zones within a node are in order of monotonic increases memory addresses | |
3060 | */ | |
3061 | void __meminit adjust_zone_range_for_zone_movable(int nid, | |
3062 | unsigned long zone_type, | |
3063 | unsigned long node_start_pfn, | |
3064 | unsigned long node_end_pfn, | |
3065 | unsigned long *zone_start_pfn, | |
3066 | unsigned long *zone_end_pfn) | |
3067 | { | |
3068 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
3069 | if (zone_movable_pfn[nid]) { | |
3070 | /* Size ZONE_MOVABLE */ | |
3071 | if (zone_type == ZONE_MOVABLE) { | |
3072 | *zone_start_pfn = zone_movable_pfn[nid]; | |
3073 | *zone_end_pfn = min(node_end_pfn, | |
3074 | arch_zone_highest_possible_pfn[movable_zone]); | |
3075 | ||
3076 | /* Adjust for ZONE_MOVABLE starting within this range */ | |
3077 | } else if (*zone_start_pfn < zone_movable_pfn[nid] && | |
3078 | *zone_end_pfn > zone_movable_pfn[nid]) { | |
3079 | *zone_end_pfn = zone_movable_pfn[nid]; | |
3080 | ||
3081 | /* Check if this whole range is within ZONE_MOVABLE */ | |
3082 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
3083 | *zone_start_pfn = *zone_end_pfn; | |
3084 | } | |
3085 | } | |
3086 | ||
c713216d MG |
3087 | /* |
3088 | * Return the number of pages a zone spans in a node, including holes | |
3089 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
3090 | */ | |
6ea6e688 | 3091 | static unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d MG |
3092 | unsigned long zone_type, |
3093 | unsigned long *ignored) | |
3094 | { | |
3095 | unsigned long node_start_pfn, node_end_pfn; | |
3096 | unsigned long zone_start_pfn, zone_end_pfn; | |
3097 | ||
3098 | /* Get the start and end of the node and zone */ | |
3099 | get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); | |
3100 | zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; | |
3101 | zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; | |
2a1e274a MG |
3102 | adjust_zone_range_for_zone_movable(nid, zone_type, |
3103 | node_start_pfn, node_end_pfn, | |
3104 | &zone_start_pfn, &zone_end_pfn); | |
c713216d MG |
3105 | |
3106 | /* Check that this node has pages within the zone's required range */ | |
3107 | if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn) | |
3108 | return 0; | |
3109 | ||
3110 | /* Move the zone boundaries inside the node if necessary */ | |
3111 | zone_end_pfn = min(zone_end_pfn, node_end_pfn); | |
3112 | zone_start_pfn = max(zone_start_pfn, node_start_pfn); | |
3113 | ||
3114 | /* Return the spanned pages */ | |
3115 | return zone_end_pfn - zone_start_pfn; | |
3116 | } | |
3117 | ||
3118 | /* | |
3119 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 3120 | * then all holes in the requested range will be accounted for. |
c713216d | 3121 | */ |
a3142c8e | 3122 | unsigned long __meminit __absent_pages_in_range(int nid, |
c713216d MG |
3123 | unsigned long range_start_pfn, |
3124 | unsigned long range_end_pfn) | |
3125 | { | |
3126 | int i = 0; | |
3127 | unsigned long prev_end_pfn = 0, hole_pages = 0; | |
3128 | unsigned long start_pfn; | |
3129 | ||
3130 | /* Find the end_pfn of the first active range of pfns in the node */ | |
3131 | i = first_active_region_index_in_nid(nid); | |
3132 | if (i == -1) | |
3133 | return 0; | |
3134 | ||
b5445f95 MG |
3135 | prev_end_pfn = min(early_node_map[i].start_pfn, range_end_pfn); |
3136 | ||
9c7cd687 MG |
3137 | /* Account for ranges before physical memory on this node */ |
3138 | if (early_node_map[i].start_pfn > range_start_pfn) | |
b5445f95 | 3139 | hole_pages = prev_end_pfn - range_start_pfn; |
c713216d MG |
3140 | |
3141 | /* Find all holes for the zone within the node */ | |
3142 | for (; i != -1; i = next_active_region_index_in_nid(i, nid)) { | |
3143 | ||
3144 | /* No need to continue if prev_end_pfn is outside the zone */ | |
3145 | if (prev_end_pfn >= range_end_pfn) | |
3146 | break; | |
3147 | ||
3148 | /* Make sure the end of the zone is not within the hole */ | |
3149 | start_pfn = min(early_node_map[i].start_pfn, range_end_pfn); | |
3150 | prev_end_pfn = max(prev_end_pfn, range_start_pfn); | |
3151 | ||
3152 | /* Update the hole size cound and move on */ | |
3153 | if (start_pfn > range_start_pfn) { | |
3154 | BUG_ON(prev_end_pfn > start_pfn); | |
3155 | hole_pages += start_pfn - prev_end_pfn; | |
3156 | } | |
3157 | prev_end_pfn = early_node_map[i].end_pfn; | |
3158 | } | |
3159 | ||
9c7cd687 MG |
3160 | /* Account for ranges past physical memory on this node */ |
3161 | if (range_end_pfn > prev_end_pfn) | |
0c6cb974 | 3162 | hole_pages += range_end_pfn - |
9c7cd687 MG |
3163 | max(range_start_pfn, prev_end_pfn); |
3164 | ||
c713216d MG |
3165 | return hole_pages; |
3166 | } | |
3167 | ||
3168 | /** | |
3169 | * absent_pages_in_range - Return number of page frames in holes within a range | |
3170 | * @start_pfn: The start PFN to start searching for holes | |
3171 | * @end_pfn: The end PFN to stop searching for holes | |
3172 | * | |
88ca3b94 | 3173 | * It returns the number of pages frames in memory holes within a range. |
c713216d MG |
3174 | */ |
3175 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
3176 | unsigned long end_pfn) | |
3177 | { | |
3178 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
3179 | } | |
3180 | ||
3181 | /* Return the number of page frames in holes in a zone on a node */ | |
6ea6e688 | 3182 | static unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d MG |
3183 | unsigned long zone_type, |
3184 | unsigned long *ignored) | |
3185 | { | |
9c7cd687 MG |
3186 | unsigned long node_start_pfn, node_end_pfn; |
3187 | unsigned long zone_start_pfn, zone_end_pfn; | |
3188 | ||
3189 | get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); | |
3190 | zone_start_pfn = max(arch_zone_lowest_possible_pfn[zone_type], | |
3191 | node_start_pfn); | |
3192 | zone_end_pfn = min(arch_zone_highest_possible_pfn[zone_type], | |
3193 | node_end_pfn); | |
3194 | ||
2a1e274a MG |
3195 | adjust_zone_range_for_zone_movable(nid, zone_type, |
3196 | node_start_pfn, node_end_pfn, | |
3197 | &zone_start_pfn, &zone_end_pfn); | |
9c7cd687 | 3198 | return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
c713216d | 3199 | } |
0e0b864e | 3200 | |
c713216d | 3201 | #else |
6ea6e688 | 3202 | static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d MG |
3203 | unsigned long zone_type, |
3204 | unsigned long *zones_size) | |
3205 | { | |
3206 | return zones_size[zone_type]; | |
3207 | } | |
3208 | ||
6ea6e688 | 3209 | static inline unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d MG |
3210 | unsigned long zone_type, |
3211 | unsigned long *zholes_size) | |
3212 | { | |
3213 | if (!zholes_size) | |
3214 | return 0; | |
3215 | ||
3216 | return zholes_size[zone_type]; | |
3217 | } | |
0e0b864e | 3218 | |
c713216d MG |
3219 | #endif |
3220 | ||
a3142c8e | 3221 | static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, |
c713216d MG |
3222 | unsigned long *zones_size, unsigned long *zholes_size) |
3223 | { | |
3224 | unsigned long realtotalpages, totalpages = 0; | |
3225 | enum zone_type i; | |
3226 | ||
3227 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3228 | totalpages += zone_spanned_pages_in_node(pgdat->node_id, i, | |
3229 | zones_size); | |
3230 | pgdat->node_spanned_pages = totalpages; | |
3231 | ||
3232 | realtotalpages = totalpages; | |
3233 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3234 | realtotalpages -= | |
3235 | zone_absent_pages_in_node(pgdat->node_id, i, | |
3236 | zholes_size); | |
3237 | pgdat->node_present_pages = realtotalpages; | |
3238 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
3239 | realtotalpages); | |
3240 | } | |
3241 | ||
835c134e MG |
3242 | #ifndef CONFIG_SPARSEMEM |
3243 | /* | |
3244 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
3245 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
3246 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
3247 | * round what is now in bits to nearest long in bits, then return it in |
3248 | * bytes. | |
3249 | */ | |
3250 | static unsigned long __init usemap_size(unsigned long zonesize) | |
3251 | { | |
3252 | unsigned long usemapsize; | |
3253 | ||
d9c23400 MG |
3254 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
3255 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
3256 | usemapsize *= NR_PAGEBLOCK_BITS; |
3257 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
3258 | ||
3259 | return usemapsize / 8; | |
3260 | } | |
3261 | ||
3262 | static void __init setup_usemap(struct pglist_data *pgdat, | |
3263 | struct zone *zone, unsigned long zonesize) | |
3264 | { | |
3265 | unsigned long usemapsize = usemap_size(zonesize); | |
3266 | zone->pageblock_flags = NULL; | |
3267 | if (usemapsize) { | |
3268 | zone->pageblock_flags = alloc_bootmem_node(pgdat, usemapsize); | |
3269 | memset(zone->pageblock_flags, 0, usemapsize); | |
3270 | } | |
3271 | } | |
3272 | #else | |
3273 | static void inline setup_usemap(struct pglist_data *pgdat, | |
3274 | struct zone *zone, unsigned long zonesize) {} | |
3275 | #endif /* CONFIG_SPARSEMEM */ | |
3276 | ||
d9c23400 MG |
3277 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
3278 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ | |
3279 | static inline void __init set_pageblock_order(unsigned int order) | |
3280 | { | |
3281 | /* Check that pageblock_nr_pages has not already been setup */ | |
3282 | if (pageblock_order) | |
3283 | return; | |
3284 | ||
3285 | /* | |
3286 | * Assume the largest contiguous order of interest is a huge page. | |
3287 | * This value may be variable depending on boot parameters on IA64 | |
3288 | */ | |
3289 | pageblock_order = order; | |
3290 | } | |
3291 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
3292 | ||
3293 | /* Defined this way to avoid accidently referencing HUGETLB_PAGE_ORDER */ | |
3294 | #define set_pageblock_order(x) do {} while (0) | |
3295 | ||
3296 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
3297 | ||
1da177e4 LT |
3298 | /* |
3299 | * Set up the zone data structures: | |
3300 | * - mark all pages reserved | |
3301 | * - mark all memory queues empty | |
3302 | * - clear the memory bitmaps | |
3303 | */ | |
86356ab1 | 3304 | static void __meminit free_area_init_core(struct pglist_data *pgdat, |
1da177e4 LT |
3305 | unsigned long *zones_size, unsigned long *zholes_size) |
3306 | { | |
2f1b6248 | 3307 | enum zone_type j; |
ed8ece2e | 3308 | int nid = pgdat->node_id; |
1da177e4 | 3309 | unsigned long zone_start_pfn = pgdat->node_start_pfn; |
718127cc | 3310 | int ret; |
1da177e4 | 3311 | |
208d54e5 | 3312 | pgdat_resize_init(pgdat); |
1da177e4 LT |
3313 | pgdat->nr_zones = 0; |
3314 | init_waitqueue_head(&pgdat->kswapd_wait); | |
3315 | pgdat->kswapd_max_order = 0; | |
3316 | ||
3317 | for (j = 0; j < MAX_NR_ZONES; j++) { | |
3318 | struct zone *zone = pgdat->node_zones + j; | |
0e0b864e | 3319 | unsigned long size, realsize, memmap_pages; |
1da177e4 | 3320 | |
c713216d MG |
3321 | size = zone_spanned_pages_in_node(nid, j, zones_size); |
3322 | realsize = size - zone_absent_pages_in_node(nid, j, | |
3323 | zholes_size); | |
1da177e4 | 3324 | |
0e0b864e MG |
3325 | /* |
3326 | * Adjust realsize so that it accounts for how much memory | |
3327 | * is used by this zone for memmap. This affects the watermark | |
3328 | * and per-cpu initialisations | |
3329 | */ | |
3330 | memmap_pages = (size * sizeof(struct page)) >> PAGE_SHIFT; | |
3331 | if (realsize >= memmap_pages) { | |
3332 | realsize -= memmap_pages; | |
3333 | printk(KERN_DEBUG | |
3334 | " %s zone: %lu pages used for memmap\n", | |
3335 | zone_names[j], memmap_pages); | |
3336 | } else | |
3337 | printk(KERN_WARNING | |
3338 | " %s zone: %lu pages exceeds realsize %lu\n", | |
3339 | zone_names[j], memmap_pages, realsize); | |
3340 | ||
6267276f CL |
3341 | /* Account for reserved pages */ |
3342 | if (j == 0 && realsize > dma_reserve) { | |
0e0b864e | 3343 | realsize -= dma_reserve; |
6267276f CL |
3344 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
3345 | zone_names[0], dma_reserve); | |
0e0b864e MG |
3346 | } |
3347 | ||
98d2b0eb | 3348 | if (!is_highmem_idx(j)) |
1da177e4 LT |
3349 | nr_kernel_pages += realsize; |
3350 | nr_all_pages += realsize; | |
3351 | ||
3352 | zone->spanned_pages = size; | |
3353 | zone->present_pages = realsize; | |
9614634f | 3354 | #ifdef CONFIG_NUMA |
d5f541ed | 3355 | zone->node = nid; |
8417bba4 | 3356 | zone->min_unmapped_pages = (realsize*sysctl_min_unmapped_ratio) |
9614634f | 3357 | / 100; |
0ff38490 | 3358 | zone->min_slab_pages = (realsize * sysctl_min_slab_ratio) / 100; |
9614634f | 3359 | #endif |
1da177e4 LT |
3360 | zone->name = zone_names[j]; |
3361 | spin_lock_init(&zone->lock); | |
3362 | spin_lock_init(&zone->lru_lock); | |
bdc8cb98 | 3363 | zone_seqlock_init(zone); |
1da177e4 | 3364 | zone->zone_pgdat = pgdat; |
1da177e4 | 3365 | |
3bb1a852 | 3366 | zone->prev_priority = DEF_PRIORITY; |
1da177e4 | 3367 | |
ed8ece2e | 3368 | zone_pcp_init(zone); |
1da177e4 LT |
3369 | INIT_LIST_HEAD(&zone->active_list); |
3370 | INIT_LIST_HEAD(&zone->inactive_list); | |
3371 | zone->nr_scan_active = 0; | |
3372 | zone->nr_scan_inactive = 0; | |
2244b95a | 3373 | zap_zone_vm_stats(zone); |
53e9a615 | 3374 | atomic_set(&zone->reclaim_in_progress, 0); |
1da177e4 LT |
3375 | if (!size) |
3376 | continue; | |
3377 | ||
d9c23400 | 3378 | set_pageblock_order(HUGETLB_PAGE_ORDER); |
835c134e | 3379 | setup_usemap(pgdat, zone, size); |
a2f3aa02 DH |
3380 | ret = init_currently_empty_zone(zone, zone_start_pfn, |
3381 | size, MEMMAP_EARLY); | |
718127cc | 3382 | BUG_ON(ret); |
1da177e4 | 3383 | zone_start_pfn += size; |
1da177e4 LT |
3384 | } |
3385 | } | |
3386 | ||
577a32f6 | 3387 | static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 3388 | { |
1da177e4 LT |
3389 | /* Skip empty nodes */ |
3390 | if (!pgdat->node_spanned_pages) | |
3391 | return; | |
3392 | ||
d41dee36 | 3393 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
1da177e4 LT |
3394 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
3395 | if (!pgdat->node_mem_map) { | |
e984bb43 | 3396 | unsigned long size, start, end; |
d41dee36 AW |
3397 | struct page *map; |
3398 | ||
e984bb43 BP |
3399 | /* |
3400 | * The zone's endpoints aren't required to be MAX_ORDER | |
3401 | * aligned but the node_mem_map endpoints must be in order | |
3402 | * for the buddy allocator to function correctly. | |
3403 | */ | |
3404 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); | |
3405 | end = pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
3406 | end = ALIGN(end, MAX_ORDER_NR_PAGES); | |
3407 | size = (end - start) * sizeof(struct page); | |
6f167ec7 DH |
3408 | map = alloc_remap(pgdat->node_id, size); |
3409 | if (!map) | |
3410 | map = alloc_bootmem_node(pgdat, size); | |
e984bb43 | 3411 | pgdat->node_mem_map = map + (pgdat->node_start_pfn - start); |
1da177e4 | 3412 | } |
12d810c1 | 3413 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
3414 | /* |
3415 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
3416 | */ | |
c713216d | 3417 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 3418 | mem_map = NODE_DATA(0)->node_mem_map; |
c713216d MG |
3419 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
3420 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) | |
3421 | mem_map -= pgdat->node_start_pfn; | |
3422 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ | |
3423 | } | |
1da177e4 | 3424 | #endif |
d41dee36 | 3425 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
1da177e4 LT |
3426 | } |
3427 | ||
86356ab1 | 3428 | void __meminit free_area_init_node(int nid, struct pglist_data *pgdat, |
1da177e4 LT |
3429 | unsigned long *zones_size, unsigned long node_start_pfn, |
3430 | unsigned long *zholes_size) | |
3431 | { | |
3432 | pgdat->node_id = nid; | |
3433 | pgdat->node_start_pfn = node_start_pfn; | |
c713216d | 3434 | calculate_node_totalpages(pgdat, zones_size, zholes_size); |
1da177e4 LT |
3435 | |
3436 | alloc_node_mem_map(pgdat); | |
3437 | ||
3438 | free_area_init_core(pgdat, zones_size, zholes_size); | |
3439 | } | |
3440 | ||
c713216d | 3441 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
418508c1 MS |
3442 | |
3443 | #if MAX_NUMNODES > 1 | |
3444 | /* | |
3445 | * Figure out the number of possible node ids. | |
3446 | */ | |
3447 | static void __init setup_nr_node_ids(void) | |
3448 | { | |
3449 | unsigned int node; | |
3450 | unsigned int highest = 0; | |
3451 | ||
3452 | for_each_node_mask(node, node_possible_map) | |
3453 | highest = node; | |
3454 | nr_node_ids = highest + 1; | |
3455 | } | |
3456 | #else | |
3457 | static inline void setup_nr_node_ids(void) | |
3458 | { | |
3459 | } | |
3460 | #endif | |
3461 | ||
c713216d MG |
3462 | /** |
3463 | * add_active_range - Register a range of PFNs backed by physical memory | |
3464 | * @nid: The node ID the range resides on | |
3465 | * @start_pfn: The start PFN of the available physical memory | |
3466 | * @end_pfn: The end PFN of the available physical memory | |
3467 | * | |
3468 | * These ranges are stored in an early_node_map[] and later used by | |
3469 | * free_area_init_nodes() to calculate zone sizes and holes. If the | |
3470 | * range spans a memory hole, it is up to the architecture to ensure | |
3471 | * the memory is not freed by the bootmem allocator. If possible | |
3472 | * the range being registered will be merged with existing ranges. | |
3473 | */ | |
3474 | void __init add_active_range(unsigned int nid, unsigned long start_pfn, | |
3475 | unsigned long end_pfn) | |
3476 | { | |
3477 | int i; | |
3478 | ||
3479 | printk(KERN_DEBUG "Entering add_active_range(%d, %lu, %lu) " | |
3480 | "%d entries of %d used\n", | |
3481 | nid, start_pfn, end_pfn, | |
3482 | nr_nodemap_entries, MAX_ACTIVE_REGIONS); | |
3483 | ||
3484 | /* Merge with existing active regions if possible */ | |
3485 | for (i = 0; i < nr_nodemap_entries; i++) { | |
3486 | if (early_node_map[i].nid != nid) | |
3487 | continue; | |
3488 | ||
3489 | /* Skip if an existing region covers this new one */ | |
3490 | if (start_pfn >= early_node_map[i].start_pfn && | |
3491 | end_pfn <= early_node_map[i].end_pfn) | |
3492 | return; | |
3493 | ||
3494 | /* Merge forward if suitable */ | |
3495 | if (start_pfn <= early_node_map[i].end_pfn && | |
3496 | end_pfn > early_node_map[i].end_pfn) { | |
3497 | early_node_map[i].end_pfn = end_pfn; | |
3498 | return; | |
3499 | } | |
3500 | ||
3501 | /* Merge backward if suitable */ | |
3502 | if (start_pfn < early_node_map[i].end_pfn && | |
3503 | end_pfn >= early_node_map[i].start_pfn) { | |
3504 | early_node_map[i].start_pfn = start_pfn; | |
3505 | return; | |
3506 | } | |
3507 | } | |
3508 | ||
3509 | /* Check that early_node_map is large enough */ | |
3510 | if (i >= MAX_ACTIVE_REGIONS) { | |
3511 | printk(KERN_CRIT "More than %d memory regions, truncating\n", | |
3512 | MAX_ACTIVE_REGIONS); | |
3513 | return; | |
3514 | } | |
3515 | ||
3516 | early_node_map[i].nid = nid; | |
3517 | early_node_map[i].start_pfn = start_pfn; | |
3518 | early_node_map[i].end_pfn = end_pfn; | |
3519 | nr_nodemap_entries = i + 1; | |
3520 | } | |
3521 | ||
3522 | /** | |
3523 | * shrink_active_range - Shrink an existing registered range of PFNs | |
3524 | * @nid: The node id the range is on that should be shrunk | |
3525 | * @old_end_pfn: The old end PFN of the range | |
3526 | * @new_end_pfn: The new PFN of the range | |
3527 | * | |
3528 | * i386 with NUMA use alloc_remap() to store a node_mem_map on a local node. | |
3529 | * The map is kept at the end physical page range that has already been | |
3530 | * registered with add_active_range(). This function allows an arch to shrink | |
3531 | * an existing registered range. | |
3532 | */ | |
3533 | void __init shrink_active_range(unsigned int nid, unsigned long old_end_pfn, | |
3534 | unsigned long new_end_pfn) | |
3535 | { | |
3536 | int i; | |
3537 | ||
3538 | /* Find the old active region end and shrink */ | |
3539 | for_each_active_range_index_in_nid(i, nid) | |
3540 | if (early_node_map[i].end_pfn == old_end_pfn) { | |
3541 | early_node_map[i].end_pfn = new_end_pfn; | |
3542 | break; | |
3543 | } | |
3544 | } | |
3545 | ||
3546 | /** | |
3547 | * remove_all_active_ranges - Remove all currently registered regions | |
88ca3b94 | 3548 | * |
c713216d MG |
3549 | * During discovery, it may be found that a table like SRAT is invalid |
3550 | * and an alternative discovery method must be used. This function removes | |
3551 | * all currently registered regions. | |
3552 | */ | |
88ca3b94 | 3553 | void __init remove_all_active_ranges(void) |
c713216d MG |
3554 | { |
3555 | memset(early_node_map, 0, sizeof(early_node_map)); | |
3556 | nr_nodemap_entries = 0; | |
fb01439c MG |
3557 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE |
3558 | memset(node_boundary_start_pfn, 0, sizeof(node_boundary_start_pfn)); | |
3559 | memset(node_boundary_end_pfn, 0, sizeof(node_boundary_end_pfn)); | |
3560 | #endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */ | |
c713216d MG |
3561 | } |
3562 | ||
3563 | /* Compare two active node_active_regions */ | |
3564 | static int __init cmp_node_active_region(const void *a, const void *b) | |
3565 | { | |
3566 | struct node_active_region *arange = (struct node_active_region *)a; | |
3567 | struct node_active_region *brange = (struct node_active_region *)b; | |
3568 | ||
3569 | /* Done this way to avoid overflows */ | |
3570 | if (arange->start_pfn > brange->start_pfn) | |
3571 | return 1; | |
3572 | if (arange->start_pfn < brange->start_pfn) | |
3573 | return -1; | |
3574 | ||
3575 | return 0; | |
3576 | } | |
3577 | ||
3578 | /* sort the node_map by start_pfn */ | |
3579 | static void __init sort_node_map(void) | |
3580 | { | |
3581 | sort(early_node_map, (size_t)nr_nodemap_entries, | |
3582 | sizeof(struct node_active_region), | |
3583 | cmp_node_active_region, NULL); | |
3584 | } | |
3585 | ||
a6af2bc3 | 3586 | /* Find the lowest pfn for a node */ |
c713216d MG |
3587 | unsigned long __init find_min_pfn_for_node(unsigned long nid) |
3588 | { | |
3589 | int i; | |
a6af2bc3 | 3590 | unsigned long min_pfn = ULONG_MAX; |
1abbfb41 | 3591 | |
c713216d MG |
3592 | /* Assuming a sorted map, the first range found has the starting pfn */ |
3593 | for_each_active_range_index_in_nid(i, nid) | |
a6af2bc3 | 3594 | min_pfn = min(min_pfn, early_node_map[i].start_pfn); |
c713216d | 3595 | |
a6af2bc3 MG |
3596 | if (min_pfn == ULONG_MAX) { |
3597 | printk(KERN_WARNING | |
3598 | "Could not find start_pfn for node %lu\n", nid); | |
3599 | return 0; | |
3600 | } | |
3601 | ||
3602 | return min_pfn; | |
c713216d MG |
3603 | } |
3604 | ||
3605 | /** | |
3606 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
3607 | * | |
3608 | * It returns the minimum PFN based on information provided via | |
88ca3b94 | 3609 | * add_active_range(). |
c713216d MG |
3610 | */ |
3611 | unsigned long __init find_min_pfn_with_active_regions(void) | |
3612 | { | |
3613 | return find_min_pfn_for_node(MAX_NUMNODES); | |
3614 | } | |
3615 | ||
3616 | /** | |
3617 | * find_max_pfn_with_active_regions - Find the maximum PFN registered | |
3618 | * | |
3619 | * It returns the maximum PFN based on information provided via | |
88ca3b94 | 3620 | * add_active_range(). |
c713216d MG |
3621 | */ |
3622 | unsigned long __init find_max_pfn_with_active_regions(void) | |
3623 | { | |
3624 | int i; | |
3625 | unsigned long max_pfn = 0; | |
3626 | ||
3627 | for (i = 0; i < nr_nodemap_entries; i++) | |
3628 | max_pfn = max(max_pfn, early_node_map[i].end_pfn); | |
3629 | ||
3630 | return max_pfn; | |
3631 | } | |
3632 | ||
37b07e41 LS |
3633 | /* |
3634 | * early_calculate_totalpages() | |
3635 | * Sum pages in active regions for movable zone. | |
3636 | * Populate N_HIGH_MEMORY for calculating usable_nodes. | |
3637 | */ | |
484f51f8 | 3638 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef MG |
3639 | { |
3640 | int i; | |
3641 | unsigned long totalpages = 0; | |
3642 | ||
37b07e41 LS |
3643 | for (i = 0; i < nr_nodemap_entries; i++) { |
3644 | unsigned long pages = early_node_map[i].end_pfn - | |
7e63efef | 3645 | early_node_map[i].start_pfn; |
37b07e41 LS |
3646 | totalpages += pages; |
3647 | if (pages) | |
3648 | node_set_state(early_node_map[i].nid, N_HIGH_MEMORY); | |
3649 | } | |
3650 | return totalpages; | |
7e63efef MG |
3651 | } |
3652 | ||
2a1e274a MG |
3653 | /* |
3654 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
3655 | * is spread evenly between nodes as long as the nodes have enough | |
3656 | * memory. When they don't, some nodes will have more kernelcore than | |
3657 | * others | |
3658 | */ | |
3659 | void __init find_zone_movable_pfns_for_nodes(unsigned long *movable_pfn) | |
3660 | { | |
3661 | int i, nid; | |
3662 | unsigned long usable_startpfn; | |
3663 | unsigned long kernelcore_node, kernelcore_remaining; | |
37b07e41 LS |
3664 | unsigned long totalpages = early_calculate_totalpages(); |
3665 | int usable_nodes = nodes_weight(node_states[N_HIGH_MEMORY]); | |
2a1e274a | 3666 | |
7e63efef MG |
3667 | /* |
3668 | * If movablecore was specified, calculate what size of | |
3669 | * kernelcore that corresponds so that memory usable for | |
3670 | * any allocation type is evenly spread. If both kernelcore | |
3671 | * and movablecore are specified, then the value of kernelcore | |
3672 | * will be used for required_kernelcore if it's greater than | |
3673 | * what movablecore would have allowed. | |
3674 | */ | |
3675 | if (required_movablecore) { | |
7e63efef MG |
3676 | unsigned long corepages; |
3677 | ||
3678 | /* | |
3679 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
3680 | * was requested by the user | |
3681 | */ | |
3682 | required_movablecore = | |
3683 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
3684 | corepages = totalpages - required_movablecore; | |
3685 | ||
3686 | required_kernelcore = max(required_kernelcore, corepages); | |
3687 | } | |
3688 | ||
2a1e274a MG |
3689 | /* If kernelcore was not specified, there is no ZONE_MOVABLE */ |
3690 | if (!required_kernelcore) | |
3691 | return; | |
3692 | ||
3693 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
3694 | find_usable_zone_for_movable(); | |
3695 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; | |
3696 | ||
3697 | restart: | |
3698 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
3699 | kernelcore_node = required_kernelcore / usable_nodes; | |
37b07e41 | 3700 | for_each_node_state(nid, N_HIGH_MEMORY) { |
2a1e274a MG |
3701 | /* |
3702 | * Recalculate kernelcore_node if the division per node | |
3703 | * now exceeds what is necessary to satisfy the requested | |
3704 | * amount of memory for the kernel | |
3705 | */ | |
3706 | if (required_kernelcore < kernelcore_node) | |
3707 | kernelcore_node = required_kernelcore / usable_nodes; | |
3708 | ||
3709 | /* | |
3710 | * As the map is walked, we track how much memory is usable | |
3711 | * by the kernel using kernelcore_remaining. When it is | |
3712 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
3713 | */ | |
3714 | kernelcore_remaining = kernelcore_node; | |
3715 | ||
3716 | /* Go through each range of PFNs within this node */ | |
3717 | for_each_active_range_index_in_nid(i, nid) { | |
3718 | unsigned long start_pfn, end_pfn; | |
3719 | unsigned long size_pages; | |
3720 | ||
3721 | start_pfn = max(early_node_map[i].start_pfn, | |
3722 | zone_movable_pfn[nid]); | |
3723 | end_pfn = early_node_map[i].end_pfn; | |
3724 | if (start_pfn >= end_pfn) | |
3725 | continue; | |
3726 | ||
3727 | /* Account for what is only usable for kernelcore */ | |
3728 | if (start_pfn < usable_startpfn) { | |
3729 | unsigned long kernel_pages; | |
3730 | kernel_pages = min(end_pfn, usable_startpfn) | |
3731 | - start_pfn; | |
3732 | ||
3733 | kernelcore_remaining -= min(kernel_pages, | |
3734 | kernelcore_remaining); | |
3735 | required_kernelcore -= min(kernel_pages, | |
3736 | required_kernelcore); | |
3737 | ||
3738 | /* Continue if range is now fully accounted */ | |
3739 | if (end_pfn <= usable_startpfn) { | |
3740 | ||
3741 | /* | |
3742 | * Push zone_movable_pfn to the end so | |
3743 | * that if we have to rebalance | |
3744 | * kernelcore across nodes, we will | |
3745 | * not double account here | |
3746 | */ | |
3747 | zone_movable_pfn[nid] = end_pfn; | |
3748 | continue; | |
3749 | } | |
3750 | start_pfn = usable_startpfn; | |
3751 | } | |
3752 | ||
3753 | /* | |
3754 | * The usable PFN range for ZONE_MOVABLE is from | |
3755 | * start_pfn->end_pfn. Calculate size_pages as the | |
3756 | * number of pages used as kernelcore | |
3757 | */ | |
3758 | size_pages = end_pfn - start_pfn; | |
3759 | if (size_pages > kernelcore_remaining) | |
3760 | size_pages = kernelcore_remaining; | |
3761 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
3762 | ||
3763 | /* | |
3764 | * Some kernelcore has been met, update counts and | |
3765 | * break if the kernelcore for this node has been | |
3766 | * satisified | |
3767 | */ | |
3768 | required_kernelcore -= min(required_kernelcore, | |
3769 | size_pages); | |
3770 | kernelcore_remaining -= size_pages; | |
3771 | if (!kernelcore_remaining) | |
3772 | break; | |
3773 | } | |
3774 | } | |
3775 | ||
3776 | /* | |
3777 | * If there is still required_kernelcore, we do another pass with one | |
3778 | * less node in the count. This will push zone_movable_pfn[nid] further | |
3779 | * along on the nodes that still have memory until kernelcore is | |
3780 | * satisified | |
3781 | */ | |
3782 | usable_nodes--; | |
3783 | if (usable_nodes && required_kernelcore > usable_nodes) | |
3784 | goto restart; | |
3785 | ||
3786 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ | |
3787 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
3788 | zone_movable_pfn[nid] = | |
3789 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
3790 | } | |
3791 | ||
37b07e41 LS |
3792 | /* Any regular memory on that node ? */ |
3793 | static void check_for_regular_memory(pg_data_t *pgdat) | |
3794 | { | |
3795 | #ifdef CONFIG_HIGHMEM | |
3796 | enum zone_type zone_type; | |
3797 | ||
3798 | for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) { | |
3799 | struct zone *zone = &pgdat->node_zones[zone_type]; | |
3800 | if (zone->present_pages) | |
3801 | node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
3802 | } | |
3803 | #endif | |
3804 | } | |
3805 | ||
c713216d MG |
3806 | /** |
3807 | * free_area_init_nodes - Initialise all pg_data_t and zone data | |
88ca3b94 | 3808 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
3809 | * |
3810 | * This will call free_area_init_node() for each active node in the system. | |
3811 | * Using the page ranges provided by add_active_range(), the size of each | |
3812 | * zone in each node and their holes is calculated. If the maximum PFN | |
3813 | * between two adjacent zones match, it is assumed that the zone is empty. | |
3814 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
3815 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
3816 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
3817 | * at arch_max_dma_pfn. | |
3818 | */ | |
3819 | void __init free_area_init_nodes(unsigned long *max_zone_pfn) | |
3820 | { | |
3821 | unsigned long nid; | |
3822 | enum zone_type i; | |
3823 | ||
a6af2bc3 MG |
3824 | /* Sort early_node_map as initialisation assumes it is sorted */ |
3825 | sort_node_map(); | |
3826 | ||
c713216d MG |
3827 | /* Record where the zone boundaries are */ |
3828 | memset(arch_zone_lowest_possible_pfn, 0, | |
3829 | sizeof(arch_zone_lowest_possible_pfn)); | |
3830 | memset(arch_zone_highest_possible_pfn, 0, | |
3831 | sizeof(arch_zone_highest_possible_pfn)); | |
3832 | arch_zone_lowest_possible_pfn[0] = find_min_pfn_with_active_regions(); | |
3833 | arch_zone_highest_possible_pfn[0] = max_zone_pfn[0]; | |
3834 | for (i = 1; i < MAX_NR_ZONES; i++) { | |
2a1e274a MG |
3835 | if (i == ZONE_MOVABLE) |
3836 | continue; | |
c713216d MG |
3837 | arch_zone_lowest_possible_pfn[i] = |
3838 | arch_zone_highest_possible_pfn[i-1]; | |
3839 | arch_zone_highest_possible_pfn[i] = | |
3840 | max(max_zone_pfn[i], arch_zone_lowest_possible_pfn[i]); | |
3841 | } | |
2a1e274a MG |
3842 | arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0; |
3843 | arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0; | |
3844 | ||
3845 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
3846 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
3847 | find_zone_movable_pfns_for_nodes(zone_movable_pfn); | |
c713216d | 3848 | |
c713216d MG |
3849 | /* Print out the zone ranges */ |
3850 | printk("Zone PFN ranges:\n"); | |
2a1e274a MG |
3851 | for (i = 0; i < MAX_NR_ZONES; i++) { |
3852 | if (i == ZONE_MOVABLE) | |
3853 | continue; | |
c713216d MG |
3854 | printk(" %-8s %8lu -> %8lu\n", |
3855 | zone_names[i], | |
3856 | arch_zone_lowest_possible_pfn[i], | |
3857 | arch_zone_highest_possible_pfn[i]); | |
2a1e274a MG |
3858 | } |
3859 | ||
3860 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
3861 | printk("Movable zone start PFN for each node\n"); | |
3862 | for (i = 0; i < MAX_NUMNODES; i++) { | |
3863 | if (zone_movable_pfn[i]) | |
3864 | printk(" Node %d: %lu\n", i, zone_movable_pfn[i]); | |
3865 | } | |
c713216d MG |
3866 | |
3867 | /* Print out the early_node_map[] */ | |
3868 | printk("early_node_map[%d] active PFN ranges\n", nr_nodemap_entries); | |
3869 | for (i = 0; i < nr_nodemap_entries; i++) | |
3870 | printk(" %3d: %8lu -> %8lu\n", early_node_map[i].nid, | |
3871 | early_node_map[i].start_pfn, | |
3872 | early_node_map[i].end_pfn); | |
3873 | ||
3874 | /* Initialise every node */ | |
8ef82866 | 3875 | setup_nr_node_ids(); |
c713216d MG |
3876 | for_each_online_node(nid) { |
3877 | pg_data_t *pgdat = NODE_DATA(nid); | |
3878 | free_area_init_node(nid, pgdat, NULL, | |
3879 | find_min_pfn_for_node(nid), NULL); | |
37b07e41 LS |
3880 | |
3881 | /* Any memory on that node */ | |
3882 | if (pgdat->node_present_pages) | |
3883 | node_set_state(nid, N_HIGH_MEMORY); | |
3884 | check_for_regular_memory(pgdat); | |
c713216d MG |
3885 | } |
3886 | } | |
2a1e274a | 3887 | |
7e63efef | 3888 | static int __init cmdline_parse_core(char *p, unsigned long *core) |
2a1e274a MG |
3889 | { |
3890 | unsigned long long coremem; | |
3891 | if (!p) | |
3892 | return -EINVAL; | |
3893 | ||
3894 | coremem = memparse(p, &p); | |
7e63efef | 3895 | *core = coremem >> PAGE_SHIFT; |
2a1e274a | 3896 | |
7e63efef | 3897 | /* Paranoid check that UL is enough for the coremem value */ |
2a1e274a MG |
3898 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); |
3899 | ||
3900 | return 0; | |
3901 | } | |
ed7ed365 | 3902 | |
7e63efef MG |
3903 | /* |
3904 | * kernelcore=size sets the amount of memory for use for allocations that | |
3905 | * cannot be reclaimed or migrated. | |
3906 | */ | |
3907 | static int __init cmdline_parse_kernelcore(char *p) | |
3908 | { | |
3909 | return cmdline_parse_core(p, &required_kernelcore); | |
3910 | } | |
3911 | ||
3912 | /* | |
3913 | * movablecore=size sets the amount of memory for use for allocations that | |
3914 | * can be reclaimed or migrated. | |
3915 | */ | |
3916 | static int __init cmdline_parse_movablecore(char *p) | |
3917 | { | |
3918 | return cmdline_parse_core(p, &required_movablecore); | |
3919 | } | |
3920 | ||
ed7ed365 | 3921 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 3922 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 3923 | |
c713216d MG |
3924 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
3925 | ||
0e0b864e | 3926 | /** |
88ca3b94 RD |
3927 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
3928 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e MG |
3929 | * |
3930 | * The per-cpu batchsize and zone watermarks are determined by present_pages. | |
3931 | * In the DMA zone, a significant percentage may be consumed by kernel image | |
3932 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
3933 | * function may optionally be used to account for unfreeable pages in the |
3934 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
3935 | * smaller per-cpu batchsize. | |
0e0b864e MG |
3936 | */ |
3937 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
3938 | { | |
3939 | dma_reserve = new_dma_reserve; | |
3940 | } | |
3941 | ||
93b7504e | 3942 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
3943 | static bootmem_data_t contig_bootmem_data; |
3944 | struct pglist_data contig_page_data = { .bdata = &contig_bootmem_data }; | |
3945 | ||
3946 | EXPORT_SYMBOL(contig_page_data); | |
93b7504e | 3947 | #endif |
1da177e4 LT |
3948 | |
3949 | void __init free_area_init(unsigned long *zones_size) | |
3950 | { | |
93b7504e | 3951 | free_area_init_node(0, NODE_DATA(0), zones_size, |
1da177e4 LT |
3952 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
3953 | } | |
1da177e4 | 3954 | |
1da177e4 LT |
3955 | static int page_alloc_cpu_notify(struct notifier_block *self, |
3956 | unsigned long action, void *hcpu) | |
3957 | { | |
3958 | int cpu = (unsigned long)hcpu; | |
1da177e4 | 3959 | |
8bb78442 | 3960 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
1da177e4 LT |
3961 | local_irq_disable(); |
3962 | __drain_pages(cpu); | |
f8891e5e | 3963 | vm_events_fold_cpu(cpu); |
1da177e4 | 3964 | local_irq_enable(); |
2244b95a | 3965 | refresh_cpu_vm_stats(cpu); |
1da177e4 LT |
3966 | } |
3967 | return NOTIFY_OK; | |
3968 | } | |
1da177e4 LT |
3969 | |
3970 | void __init page_alloc_init(void) | |
3971 | { | |
3972 | hotcpu_notifier(page_alloc_cpu_notify, 0); | |
3973 | } | |
3974 | ||
cb45b0e9 HA |
3975 | /* |
3976 | * calculate_totalreserve_pages - called when sysctl_lower_zone_reserve_ratio | |
3977 | * or min_free_kbytes changes. | |
3978 | */ | |
3979 | static void calculate_totalreserve_pages(void) | |
3980 | { | |
3981 | struct pglist_data *pgdat; | |
3982 | unsigned long reserve_pages = 0; | |
2f6726e5 | 3983 | enum zone_type i, j; |
cb45b0e9 HA |
3984 | |
3985 | for_each_online_pgdat(pgdat) { | |
3986 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
3987 | struct zone *zone = pgdat->node_zones + i; | |
3988 | unsigned long max = 0; | |
3989 | ||
3990 | /* Find valid and maximum lowmem_reserve in the zone */ | |
3991 | for (j = i; j < MAX_NR_ZONES; j++) { | |
3992 | if (zone->lowmem_reserve[j] > max) | |
3993 | max = zone->lowmem_reserve[j]; | |
3994 | } | |
3995 | ||
3996 | /* we treat pages_high as reserved pages. */ | |
3997 | max += zone->pages_high; | |
3998 | ||
3999 | if (max > zone->present_pages) | |
4000 | max = zone->present_pages; | |
4001 | reserve_pages += max; | |
4002 | } | |
4003 | } | |
4004 | totalreserve_pages = reserve_pages; | |
4005 | } | |
4006 | ||
1da177e4 LT |
4007 | /* |
4008 | * setup_per_zone_lowmem_reserve - called whenever | |
4009 | * sysctl_lower_zone_reserve_ratio changes. Ensures that each zone | |
4010 | * has a correct pages reserved value, so an adequate number of | |
4011 | * pages are left in the zone after a successful __alloc_pages(). | |
4012 | */ | |
4013 | static void setup_per_zone_lowmem_reserve(void) | |
4014 | { | |
4015 | struct pglist_data *pgdat; | |
2f6726e5 | 4016 | enum zone_type j, idx; |
1da177e4 | 4017 | |
ec936fc5 | 4018 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
4019 | for (j = 0; j < MAX_NR_ZONES; j++) { |
4020 | struct zone *zone = pgdat->node_zones + j; | |
4021 | unsigned long present_pages = zone->present_pages; | |
4022 | ||
4023 | zone->lowmem_reserve[j] = 0; | |
4024 | ||
2f6726e5 CL |
4025 | idx = j; |
4026 | while (idx) { | |
1da177e4 LT |
4027 | struct zone *lower_zone; |
4028 | ||
2f6726e5 CL |
4029 | idx--; |
4030 | ||
1da177e4 LT |
4031 | if (sysctl_lowmem_reserve_ratio[idx] < 1) |
4032 | sysctl_lowmem_reserve_ratio[idx] = 1; | |
4033 | ||
4034 | lower_zone = pgdat->node_zones + idx; | |
4035 | lower_zone->lowmem_reserve[j] = present_pages / | |
4036 | sysctl_lowmem_reserve_ratio[idx]; | |
4037 | present_pages += lower_zone->present_pages; | |
4038 | } | |
4039 | } | |
4040 | } | |
cb45b0e9 HA |
4041 | |
4042 | /* update totalreserve_pages */ | |
4043 | calculate_totalreserve_pages(); | |
1da177e4 LT |
4044 | } |
4045 | ||
88ca3b94 RD |
4046 | /** |
4047 | * setup_per_zone_pages_min - called when min_free_kbytes changes. | |
4048 | * | |
4049 | * Ensures that the pages_{min,low,high} values for each zone are set correctly | |
4050 | * with respect to min_free_kbytes. | |
1da177e4 | 4051 | */ |
3947be19 | 4052 | void setup_per_zone_pages_min(void) |
1da177e4 LT |
4053 | { |
4054 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
4055 | unsigned long lowmem_pages = 0; | |
4056 | struct zone *zone; | |
4057 | unsigned long flags; | |
4058 | ||
4059 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
4060 | for_each_zone(zone) { | |
4061 | if (!is_highmem(zone)) | |
4062 | lowmem_pages += zone->present_pages; | |
4063 | } | |
4064 | ||
4065 | for_each_zone(zone) { | |
ac924c60 AM |
4066 | u64 tmp; |
4067 | ||
1da177e4 | 4068 | spin_lock_irqsave(&zone->lru_lock, flags); |
ac924c60 AM |
4069 | tmp = (u64)pages_min * zone->present_pages; |
4070 | do_div(tmp, lowmem_pages); | |
1da177e4 LT |
4071 | if (is_highmem(zone)) { |
4072 | /* | |
669ed175 NP |
4073 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
4074 | * need highmem pages, so cap pages_min to a small | |
4075 | * value here. | |
4076 | * | |
4077 | * The (pages_high-pages_low) and (pages_low-pages_min) | |
4078 | * deltas controls asynch page reclaim, and so should | |
4079 | * not be capped for highmem. | |
1da177e4 LT |
4080 | */ |
4081 | int min_pages; | |
4082 | ||
4083 | min_pages = zone->present_pages / 1024; | |
4084 | if (min_pages < SWAP_CLUSTER_MAX) | |
4085 | min_pages = SWAP_CLUSTER_MAX; | |
4086 | if (min_pages > 128) | |
4087 | min_pages = 128; | |
4088 | zone->pages_min = min_pages; | |
4089 | } else { | |
669ed175 NP |
4090 | /* |
4091 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
4092 | * proportionate to the zone's size. |
4093 | */ | |
669ed175 | 4094 | zone->pages_min = tmp; |
1da177e4 LT |
4095 | } |
4096 | ||
ac924c60 AM |
4097 | zone->pages_low = zone->pages_min + (tmp >> 2); |
4098 | zone->pages_high = zone->pages_min + (tmp >> 1); | |
56fd56b8 | 4099 | setup_zone_migrate_reserve(zone); |
1da177e4 LT |
4100 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
4101 | } | |
cb45b0e9 HA |
4102 | |
4103 | /* update totalreserve_pages */ | |
4104 | calculate_totalreserve_pages(); | |
1da177e4 LT |
4105 | } |
4106 | ||
4107 | /* | |
4108 | * Initialise min_free_kbytes. | |
4109 | * | |
4110 | * For small machines we want it small (128k min). For large machines | |
4111 | * we want it large (64MB max). But it is not linear, because network | |
4112 | * bandwidth does not increase linearly with machine size. We use | |
4113 | * | |
4114 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: | |
4115 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) | |
4116 | * | |
4117 | * which yields | |
4118 | * | |
4119 | * 16MB: 512k | |
4120 | * 32MB: 724k | |
4121 | * 64MB: 1024k | |
4122 | * 128MB: 1448k | |
4123 | * 256MB: 2048k | |
4124 | * 512MB: 2896k | |
4125 | * 1024MB: 4096k | |
4126 | * 2048MB: 5792k | |
4127 | * 4096MB: 8192k | |
4128 | * 8192MB: 11584k | |
4129 | * 16384MB: 16384k | |
4130 | */ | |
4131 | static int __init init_per_zone_pages_min(void) | |
4132 | { | |
4133 | unsigned long lowmem_kbytes; | |
4134 | ||
4135 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
4136 | ||
4137 | min_free_kbytes = int_sqrt(lowmem_kbytes * 16); | |
4138 | if (min_free_kbytes < 128) | |
4139 | min_free_kbytes = 128; | |
4140 | if (min_free_kbytes > 65536) | |
4141 | min_free_kbytes = 65536; | |
4142 | setup_per_zone_pages_min(); | |
4143 | setup_per_zone_lowmem_reserve(); | |
4144 | return 0; | |
4145 | } | |
4146 | module_init(init_per_zone_pages_min) | |
4147 | ||
4148 | /* | |
4149 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so | |
4150 | * that we can call two helper functions whenever min_free_kbytes | |
4151 | * changes. | |
4152 | */ | |
4153 | int min_free_kbytes_sysctl_handler(ctl_table *table, int write, | |
4154 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4155 | { | |
4156 | proc_dointvec(table, write, file, buffer, length, ppos); | |
3b1d92c5 MG |
4157 | if (write) |
4158 | setup_per_zone_pages_min(); | |
1da177e4 LT |
4159 | return 0; |
4160 | } | |
4161 | ||
9614634f CL |
4162 | #ifdef CONFIG_NUMA |
4163 | int sysctl_min_unmapped_ratio_sysctl_handler(ctl_table *table, int write, | |
4164 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4165 | { | |
4166 | struct zone *zone; | |
4167 | int rc; | |
4168 | ||
4169 | rc = proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4170 | if (rc) | |
4171 | return rc; | |
4172 | ||
4173 | for_each_zone(zone) | |
8417bba4 | 4174 | zone->min_unmapped_pages = (zone->present_pages * |
9614634f CL |
4175 | sysctl_min_unmapped_ratio) / 100; |
4176 | return 0; | |
4177 | } | |
0ff38490 CL |
4178 | |
4179 | int sysctl_min_slab_ratio_sysctl_handler(ctl_table *table, int write, | |
4180 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4181 | { | |
4182 | struct zone *zone; | |
4183 | int rc; | |
4184 | ||
4185 | rc = proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4186 | if (rc) | |
4187 | return rc; | |
4188 | ||
4189 | for_each_zone(zone) | |
4190 | zone->min_slab_pages = (zone->present_pages * | |
4191 | sysctl_min_slab_ratio) / 100; | |
4192 | return 0; | |
4193 | } | |
9614634f CL |
4194 | #endif |
4195 | ||
1da177e4 LT |
4196 | /* |
4197 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
4198 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
4199 | * whenever sysctl_lowmem_reserve_ratio changes. | |
4200 | * | |
4201 | * The reserve ratio obviously has absolutely no relation with the | |
4202 | * pages_min watermarks. The lowmem reserve ratio can only make sense | |
4203 | * if in function of the boot time zone sizes. | |
4204 | */ | |
4205 | int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write, | |
4206 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4207 | { | |
4208 | proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4209 | setup_per_zone_lowmem_reserve(); | |
4210 | return 0; | |
4211 | } | |
4212 | ||
8ad4b1fb RS |
4213 | /* |
4214 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
4215 | * cpu. It is the fraction of total pages in each zone that a hot per cpu pagelist | |
4216 | * can have before it gets flushed back to buddy allocator. | |
4217 | */ | |
4218 | ||
4219 | int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, | |
4220 | struct file *file, void __user *buffer, size_t *length, loff_t *ppos) | |
4221 | { | |
4222 | struct zone *zone; | |
4223 | unsigned int cpu; | |
4224 | int ret; | |
4225 | ||
4226 | ret = proc_dointvec_minmax(table, write, file, buffer, length, ppos); | |
4227 | if (!write || (ret == -EINVAL)) | |
4228 | return ret; | |
4229 | for_each_zone(zone) { | |
4230 | for_each_online_cpu(cpu) { | |
4231 | unsigned long high; | |
4232 | high = zone->present_pages / percpu_pagelist_fraction; | |
4233 | setup_pagelist_highmark(zone_pcp(zone, cpu), high); | |
4234 | } | |
4235 | } | |
4236 | return 0; | |
4237 | } | |
4238 | ||
f034b5d4 | 4239 | int hashdist = HASHDIST_DEFAULT; |
1da177e4 LT |
4240 | |
4241 | #ifdef CONFIG_NUMA | |
4242 | static int __init set_hashdist(char *str) | |
4243 | { | |
4244 | if (!str) | |
4245 | return 0; | |
4246 | hashdist = simple_strtoul(str, &str, 0); | |
4247 | return 1; | |
4248 | } | |
4249 | __setup("hashdist=", set_hashdist); | |
4250 | #endif | |
4251 | ||
4252 | /* | |
4253 | * allocate a large system hash table from bootmem | |
4254 | * - it is assumed that the hash table must contain an exact power-of-2 | |
4255 | * quantity of entries | |
4256 | * - limit is the number of hash buckets, not the total allocation size | |
4257 | */ | |
4258 | void *__init alloc_large_system_hash(const char *tablename, | |
4259 | unsigned long bucketsize, | |
4260 | unsigned long numentries, | |
4261 | int scale, | |
4262 | int flags, | |
4263 | unsigned int *_hash_shift, | |
4264 | unsigned int *_hash_mask, | |
4265 | unsigned long limit) | |
4266 | { | |
4267 | unsigned long long max = limit; | |
4268 | unsigned long log2qty, size; | |
4269 | void *table = NULL; | |
4270 | ||
4271 | /* allow the kernel cmdline to have a say */ | |
4272 | if (!numentries) { | |
4273 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 4274 | numentries = nr_kernel_pages; |
1da177e4 LT |
4275 | numentries += (1UL << (20 - PAGE_SHIFT)) - 1; |
4276 | numentries >>= 20 - PAGE_SHIFT; | |
4277 | numentries <<= 20 - PAGE_SHIFT; | |
4278 | ||
4279 | /* limit to 1 bucket per 2^scale bytes of low memory */ | |
4280 | if (scale > PAGE_SHIFT) | |
4281 | numentries >>= (scale - PAGE_SHIFT); | |
4282 | else | |
4283 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
4284 | |
4285 | /* Make sure we've got at least a 0-order allocation.. */ | |
4286 | if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
4287 | numentries = PAGE_SIZE / bucketsize; | |
1da177e4 | 4288 | } |
6e692ed3 | 4289 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
4290 | |
4291 | /* limit allocation size to 1/16 total memory by default */ | |
4292 | if (max == 0) { | |
4293 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
4294 | do_div(max, bucketsize); | |
4295 | } | |
4296 | ||
4297 | if (numentries > max) | |
4298 | numentries = max; | |
4299 | ||
f0d1b0b3 | 4300 | log2qty = ilog2(numentries); |
1da177e4 LT |
4301 | |
4302 | do { | |
4303 | size = bucketsize << log2qty; | |
4304 | if (flags & HASH_EARLY) | |
4305 | table = alloc_bootmem(size); | |
4306 | else if (hashdist) | |
4307 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); | |
4308 | else { | |
4309 | unsigned long order; | |
4310 | for (order = 0; ((1UL << order) << PAGE_SHIFT) < size; order++) | |
4311 | ; | |
4312 | table = (void*) __get_free_pages(GFP_ATOMIC, order); | |
1037b83b ED |
4313 | /* |
4314 | * If bucketsize is not a power-of-two, we may free | |
4315 | * some pages at the end of hash table. | |
4316 | */ | |
4317 | if (table) { | |
4318 | unsigned long alloc_end = (unsigned long)table + | |
4319 | (PAGE_SIZE << order); | |
4320 | unsigned long used = (unsigned long)table + | |
4321 | PAGE_ALIGN(size); | |
4322 | split_page(virt_to_page(table), order); | |
4323 | while (used < alloc_end) { | |
4324 | free_page(used); | |
4325 | used += PAGE_SIZE; | |
4326 | } | |
4327 | } | |
1da177e4 LT |
4328 | } |
4329 | } while (!table && size > PAGE_SIZE && --log2qty); | |
4330 | ||
4331 | if (!table) | |
4332 | panic("Failed to allocate %s hash table\n", tablename); | |
4333 | ||
b49ad484 | 4334 | printk(KERN_INFO "%s hash table entries: %d (order: %d, %lu bytes)\n", |
1da177e4 LT |
4335 | tablename, |
4336 | (1U << log2qty), | |
f0d1b0b3 | 4337 | ilog2(size) - PAGE_SHIFT, |
1da177e4 LT |
4338 | size); |
4339 | ||
4340 | if (_hash_shift) | |
4341 | *_hash_shift = log2qty; | |
4342 | if (_hash_mask) | |
4343 | *_hash_mask = (1 << log2qty) - 1; | |
4344 | ||
4345 | return table; | |
4346 | } | |
a117e66e KH |
4347 | |
4348 | #ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE | |
a117e66e KH |
4349 | struct page *pfn_to_page(unsigned long pfn) |
4350 | { | |
67de6482 | 4351 | return __pfn_to_page(pfn); |
a117e66e KH |
4352 | } |
4353 | unsigned long page_to_pfn(struct page *page) | |
4354 | { | |
67de6482 | 4355 | return __page_to_pfn(page); |
a117e66e | 4356 | } |
a117e66e KH |
4357 | EXPORT_SYMBOL(pfn_to_page); |
4358 | EXPORT_SYMBOL(page_to_pfn); | |
4359 | #endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */ | |
6220ec78 | 4360 | |
835c134e MG |
4361 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
4362 | static inline unsigned long *get_pageblock_bitmap(struct zone *zone, | |
4363 | unsigned long pfn) | |
4364 | { | |
4365 | #ifdef CONFIG_SPARSEMEM | |
4366 | return __pfn_to_section(pfn)->pageblock_flags; | |
4367 | #else | |
4368 | return zone->pageblock_flags; | |
4369 | #endif /* CONFIG_SPARSEMEM */ | |
4370 | } | |
4371 | ||
4372 | static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn) | |
4373 | { | |
4374 | #ifdef CONFIG_SPARSEMEM | |
4375 | pfn &= (PAGES_PER_SECTION-1); | |
d9c23400 | 4376 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e MG |
4377 | #else |
4378 | pfn = pfn - zone->zone_start_pfn; | |
d9c23400 | 4379 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e MG |
4380 | #endif /* CONFIG_SPARSEMEM */ |
4381 | } | |
4382 | ||
4383 | /** | |
d9c23400 | 4384 | * get_pageblock_flags_group - Return the requested group of flags for the pageblock_nr_pages block of pages |
835c134e MG |
4385 | * @page: The page within the block of interest |
4386 | * @start_bitidx: The first bit of interest to retrieve | |
4387 | * @end_bitidx: The last bit of interest | |
4388 | * returns pageblock_bits flags | |
4389 | */ | |
4390 | unsigned long get_pageblock_flags_group(struct page *page, | |
4391 | int start_bitidx, int end_bitidx) | |
4392 | { | |
4393 | struct zone *zone; | |
4394 | unsigned long *bitmap; | |
4395 | unsigned long pfn, bitidx; | |
4396 | unsigned long flags = 0; | |
4397 | unsigned long value = 1; | |
4398 | ||
4399 | zone = page_zone(page); | |
4400 | pfn = page_to_pfn(page); | |
4401 | bitmap = get_pageblock_bitmap(zone, pfn); | |
4402 | bitidx = pfn_to_bitidx(zone, pfn); | |
4403 | ||
4404 | for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1) | |
4405 | if (test_bit(bitidx + start_bitidx, bitmap)) | |
4406 | flags |= value; | |
6220ec78 | 4407 | |
835c134e MG |
4408 | return flags; |
4409 | } | |
4410 | ||
4411 | /** | |
d9c23400 | 4412 | * set_pageblock_flags_group - Set the requested group of flags for a pageblock_nr_pages block of pages |
835c134e MG |
4413 | * @page: The page within the block of interest |
4414 | * @start_bitidx: The first bit of interest | |
4415 | * @end_bitidx: The last bit of interest | |
4416 | * @flags: The flags to set | |
4417 | */ | |
4418 | void set_pageblock_flags_group(struct page *page, unsigned long flags, | |
4419 | int start_bitidx, int end_bitidx) | |
4420 | { | |
4421 | struct zone *zone; | |
4422 | unsigned long *bitmap; | |
4423 | unsigned long pfn, bitidx; | |
4424 | unsigned long value = 1; | |
4425 | ||
4426 | zone = page_zone(page); | |
4427 | pfn = page_to_pfn(page); | |
4428 | bitmap = get_pageblock_bitmap(zone, pfn); | |
4429 | bitidx = pfn_to_bitidx(zone, pfn); | |
4430 | ||
4431 | for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1) | |
4432 | if (flags & value) | |
4433 | __set_bit(bitidx + start_bitidx, bitmap); | |
4434 | else | |
4435 | __clear_bit(bitidx + start_bitidx, bitmap); | |
4436 | } | |
a5d76b54 KH |
4437 | |
4438 | /* | |
4439 | * This is designed as sub function...plz see page_isolation.c also. | |
4440 | * set/clear page block's type to be ISOLATE. | |
4441 | * page allocater never alloc memory from ISOLATE block. | |
4442 | */ | |
4443 | ||
4444 | int set_migratetype_isolate(struct page *page) | |
4445 | { | |
4446 | struct zone *zone; | |
4447 | unsigned long flags; | |
4448 | int ret = -EBUSY; | |
4449 | ||
4450 | zone = page_zone(page); | |
4451 | spin_lock_irqsave(&zone->lock, flags); | |
4452 | /* | |
4453 | * In future, more migrate types will be able to be isolation target. | |
4454 | */ | |
4455 | if (get_pageblock_migratetype(page) != MIGRATE_MOVABLE) | |
4456 | goto out; | |
4457 | set_pageblock_migratetype(page, MIGRATE_ISOLATE); | |
4458 | move_freepages_block(zone, page, MIGRATE_ISOLATE); | |
4459 | ret = 0; | |
4460 | out: | |
4461 | spin_unlock_irqrestore(&zone->lock, flags); | |
4462 | if (!ret) | |
4463 | drain_all_local_pages(); | |
4464 | return ret; | |
4465 | } | |
4466 | ||
4467 | void unset_migratetype_isolate(struct page *page) | |
4468 | { | |
4469 | struct zone *zone; | |
4470 | unsigned long flags; | |
4471 | zone = page_zone(page); | |
4472 | spin_lock_irqsave(&zone->lock, flags); | |
4473 | if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE) | |
4474 | goto out; | |
4475 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
4476 | move_freepages_block(zone, page, MIGRATE_MOVABLE); | |
4477 | out: | |
4478 | spin_unlock_irqrestore(&zone->lock, flags); | |
4479 | } | |
0c0e6195 KH |
4480 | |
4481 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
4482 | /* | |
4483 | * All pages in the range must be isolated before calling this. | |
4484 | */ | |
4485 | void | |
4486 | __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
4487 | { | |
4488 | struct page *page; | |
4489 | struct zone *zone; | |
4490 | int order, i; | |
4491 | unsigned long pfn; | |
4492 | unsigned long flags; | |
4493 | /* find the first valid pfn */ | |
4494 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
4495 | if (pfn_valid(pfn)) | |
4496 | break; | |
4497 | if (pfn == end_pfn) | |
4498 | return; | |
4499 | zone = page_zone(pfn_to_page(pfn)); | |
4500 | spin_lock_irqsave(&zone->lock, flags); | |
4501 | pfn = start_pfn; | |
4502 | while (pfn < end_pfn) { | |
4503 | if (!pfn_valid(pfn)) { | |
4504 | pfn++; | |
4505 | continue; | |
4506 | } | |
4507 | page = pfn_to_page(pfn); | |
4508 | BUG_ON(page_count(page)); | |
4509 | BUG_ON(!PageBuddy(page)); | |
4510 | order = page_order(page); | |
4511 | #ifdef CONFIG_DEBUG_VM | |
4512 | printk(KERN_INFO "remove from free list %lx %d %lx\n", | |
4513 | pfn, 1 << order, end_pfn); | |
4514 | #endif | |
4515 | list_del(&page->lru); | |
4516 | rmv_page_order(page); | |
4517 | zone->free_area[order].nr_free--; | |
4518 | __mod_zone_page_state(zone, NR_FREE_PAGES, | |
4519 | - (1UL << order)); | |
4520 | for (i = 0; i < (1 << order); i++) | |
4521 | SetPageReserved((page+i)); | |
4522 | pfn += (1 << order); | |
4523 | } | |
4524 | spin_unlock_irqrestore(&zone->lock, flags); | |
4525 | } | |
4526 | #endif |