Commit | Line | Data |
---|---|---|
81819f0f CL |
1 | /* |
2 | * SLUB: A slab allocator that limits cache line use instead of queuing | |
3 | * objects in per cpu and per node lists. | |
4 | * | |
881db7fb CL |
5 | * The allocator synchronizes using per slab locks or atomic operatios |
6 | * and only uses a centralized lock to manage a pool of partial slabs. | |
81819f0f | 7 | * |
cde53535 | 8 | * (C) 2007 SGI, Christoph Lameter |
881db7fb | 9 | * (C) 2011 Linux Foundation, Christoph Lameter |
81819f0f CL |
10 | */ |
11 | ||
12 | #include <linux/mm.h> | |
1eb5ac64 | 13 | #include <linux/swap.h> /* struct reclaim_state */ |
81819f0f CL |
14 | #include <linux/module.h> |
15 | #include <linux/bit_spinlock.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <linux/slab.h> | |
97d06609 | 19 | #include "slab.h" |
7b3c3a50 | 20 | #include <linux/proc_fs.h> |
3ac38faa | 21 | #include <linux/notifier.h> |
81819f0f | 22 | #include <linux/seq_file.h> |
5a896d9e | 23 | #include <linux/kmemcheck.h> |
81819f0f CL |
24 | #include <linux/cpu.h> |
25 | #include <linux/cpuset.h> | |
26 | #include <linux/mempolicy.h> | |
27 | #include <linux/ctype.h> | |
3ac7fe5a | 28 | #include <linux/debugobjects.h> |
81819f0f | 29 | #include <linux/kallsyms.h> |
b9049e23 | 30 | #include <linux/memory.h> |
f8bd2258 | 31 | #include <linux/math64.h> |
773ff60e | 32 | #include <linux/fault-inject.h> |
bfa71457 | 33 | #include <linux/stacktrace.h> |
4de900b4 | 34 | #include <linux/prefetch.h> |
2633d7a0 | 35 | #include <linux/memcontrol.h> |
81819f0f | 36 | |
4a92379b RK |
37 | #include <trace/events/kmem.h> |
38 | ||
072bb0aa MG |
39 | #include "internal.h" |
40 | ||
81819f0f CL |
41 | /* |
42 | * Lock order: | |
18004c5d | 43 | * 1. slab_mutex (Global Mutex) |
881db7fb CL |
44 | * 2. node->list_lock |
45 | * 3. slab_lock(page) (Only on some arches and for debugging) | |
81819f0f | 46 | * |
18004c5d | 47 | * slab_mutex |
881db7fb | 48 | * |
18004c5d | 49 | * The role of the slab_mutex is to protect the list of all the slabs |
881db7fb CL |
50 | * and to synchronize major metadata changes to slab cache structures. |
51 | * | |
52 | * The slab_lock is only used for debugging and on arches that do not | |
53 | * have the ability to do a cmpxchg_double. It only protects the second | |
54 | * double word in the page struct. Meaning | |
55 | * A. page->freelist -> List of object free in a page | |
56 | * B. page->counters -> Counters of objects | |
57 | * C. page->frozen -> frozen state | |
58 | * | |
59 | * If a slab is frozen then it is exempt from list management. It is not | |
60 | * on any list. The processor that froze the slab is the one who can | |
61 | * perform list operations on the page. Other processors may put objects | |
62 | * onto the freelist but the processor that froze the slab is the only | |
63 | * one that can retrieve the objects from the page's freelist. | |
81819f0f CL |
64 | * |
65 | * The list_lock protects the partial and full list on each node and | |
66 | * the partial slab counter. If taken then no new slabs may be added or | |
67 | * removed from the lists nor make the number of partial slabs be modified. | |
68 | * (Note that the total number of slabs is an atomic value that may be | |
69 | * modified without taking the list lock). | |
70 | * | |
71 | * The list_lock is a centralized lock and thus we avoid taking it as | |
72 | * much as possible. As long as SLUB does not have to handle partial | |
73 | * slabs, operations can continue without any centralized lock. F.e. | |
74 | * allocating a long series of objects that fill up slabs does not require | |
75 | * the list lock. | |
81819f0f CL |
76 | * Interrupts are disabled during allocation and deallocation in order to |
77 | * make the slab allocator safe to use in the context of an irq. In addition | |
78 | * interrupts are disabled to ensure that the processor does not change | |
79 | * while handling per_cpu slabs, due to kernel preemption. | |
80 | * | |
81 | * SLUB assigns one slab for allocation to each processor. | |
82 | * Allocations only occur from these slabs called cpu slabs. | |
83 | * | |
672bba3a CL |
84 | * Slabs with free elements are kept on a partial list and during regular |
85 | * operations no list for full slabs is used. If an object in a full slab is | |
81819f0f | 86 | * freed then the slab will show up again on the partial lists. |
672bba3a CL |
87 | * We track full slabs for debugging purposes though because otherwise we |
88 | * cannot scan all objects. | |
81819f0f CL |
89 | * |
90 | * Slabs are freed when they become empty. Teardown and setup is | |
91 | * minimal so we rely on the page allocators per cpu caches for | |
92 | * fast frees and allocs. | |
93 | * | |
94 | * Overloading of page flags that are otherwise used for LRU management. | |
95 | * | |
4b6f0750 CL |
96 | * PageActive The slab is frozen and exempt from list processing. |
97 | * This means that the slab is dedicated to a purpose | |
98 | * such as satisfying allocations for a specific | |
99 | * processor. Objects may be freed in the slab while | |
100 | * it is frozen but slab_free will then skip the usual | |
101 | * list operations. It is up to the processor holding | |
102 | * the slab to integrate the slab into the slab lists | |
103 | * when the slab is no longer needed. | |
104 | * | |
105 | * One use of this flag is to mark slabs that are | |
106 | * used for allocations. Then such a slab becomes a cpu | |
107 | * slab. The cpu slab may be equipped with an additional | |
dfb4f096 | 108 | * freelist that allows lockless access to |
894b8788 CL |
109 | * free objects in addition to the regular freelist |
110 | * that requires the slab lock. | |
81819f0f CL |
111 | * |
112 | * PageError Slab requires special handling due to debug | |
113 | * options set. This moves slab handling out of | |
894b8788 | 114 | * the fast path and disables lockless freelists. |
81819f0f CL |
115 | */ |
116 | ||
af537b0a CL |
117 | static inline int kmem_cache_debug(struct kmem_cache *s) |
118 | { | |
5577bd8a | 119 | #ifdef CONFIG_SLUB_DEBUG |
af537b0a | 120 | return unlikely(s->flags & SLAB_DEBUG_FLAGS); |
5577bd8a | 121 | #else |
af537b0a | 122 | return 0; |
5577bd8a | 123 | #endif |
af537b0a | 124 | } |
5577bd8a | 125 | |
81819f0f CL |
126 | /* |
127 | * Issues still to be resolved: | |
128 | * | |
81819f0f CL |
129 | * - Support PAGE_ALLOC_DEBUG. Should be easy to do. |
130 | * | |
81819f0f CL |
131 | * - Variable sizing of the per node arrays |
132 | */ | |
133 | ||
134 | /* Enable to test recovery from slab corruption on boot */ | |
135 | #undef SLUB_RESILIENCY_TEST | |
136 | ||
b789ef51 CL |
137 | /* Enable to log cmpxchg failures */ |
138 | #undef SLUB_DEBUG_CMPXCHG | |
139 | ||
2086d26a CL |
140 | /* |
141 | * Mininum number of partial slabs. These will be left on the partial | |
142 | * lists even if they are empty. kmem_cache_shrink may reclaim them. | |
143 | */ | |
76be8950 | 144 | #define MIN_PARTIAL 5 |
e95eed57 | 145 | |
2086d26a CL |
146 | /* |
147 | * Maximum number of desirable partial slabs. | |
148 | * The existence of more partial slabs makes kmem_cache_shrink | |
149 | * sort the partial list by the number of objects in the. | |
150 | */ | |
151 | #define MAX_PARTIAL 10 | |
152 | ||
81819f0f CL |
153 | #define DEBUG_DEFAULT_FLAGS (SLAB_DEBUG_FREE | SLAB_RED_ZONE | \ |
154 | SLAB_POISON | SLAB_STORE_USER) | |
672bba3a | 155 | |
fa5ec8a1 | 156 | /* |
3de47213 DR |
157 | * Debugging flags that require metadata to be stored in the slab. These get |
158 | * disabled when slub_debug=O is used and a cache's min order increases with | |
159 | * metadata. | |
fa5ec8a1 | 160 | */ |
3de47213 | 161 | #define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
fa5ec8a1 | 162 | |
81819f0f CL |
163 | /* |
164 | * Set of flags that will prevent slab merging | |
165 | */ | |
166 | #define SLUB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ | |
4c13dd3b DM |
167 | SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE | \ |
168 | SLAB_FAILSLAB) | |
81819f0f CL |
169 | |
170 | #define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \ | |
5a896d9e | 171 | SLAB_CACHE_DMA | SLAB_NOTRACK) |
81819f0f | 172 | |
210b5c06 CG |
173 | #define OO_SHIFT 16 |
174 | #define OO_MASK ((1 << OO_SHIFT) - 1) | |
50d5c41c | 175 | #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */ |
210b5c06 | 176 | |
81819f0f | 177 | /* Internal SLUB flags */ |
f90ec390 | 178 | #define __OBJECT_POISON 0x80000000UL /* Poison object */ |
b789ef51 | 179 | #define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */ |
81819f0f | 180 | |
81819f0f CL |
181 | #ifdef CONFIG_SMP |
182 | static struct notifier_block slab_notifier; | |
183 | #endif | |
184 | ||
02cbc874 CL |
185 | /* |
186 | * Tracking user of a slab. | |
187 | */ | |
d6543e39 | 188 | #define TRACK_ADDRS_COUNT 16 |
02cbc874 | 189 | struct track { |
ce71e27c | 190 | unsigned long addr; /* Called from address */ |
d6543e39 BG |
191 | #ifdef CONFIG_STACKTRACE |
192 | unsigned long addrs[TRACK_ADDRS_COUNT]; /* Called from address */ | |
193 | #endif | |
02cbc874 CL |
194 | int cpu; /* Was running on cpu */ |
195 | int pid; /* Pid context */ | |
196 | unsigned long when; /* When did the operation occur */ | |
197 | }; | |
198 | ||
199 | enum track_item { TRACK_ALLOC, TRACK_FREE }; | |
200 | ||
ab4d5ed5 | 201 | #ifdef CONFIG_SYSFS |
81819f0f CL |
202 | static int sysfs_slab_add(struct kmem_cache *); |
203 | static int sysfs_slab_alias(struct kmem_cache *, const char *); | |
204 | static void sysfs_slab_remove(struct kmem_cache *); | |
107dab5c | 205 | static void memcg_propagate_slab_attrs(struct kmem_cache *s); |
81819f0f | 206 | #else |
0c710013 CL |
207 | static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } |
208 | static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) | |
209 | { return 0; } | |
db265eca | 210 | static inline void sysfs_slab_remove(struct kmem_cache *s) { } |
8ff12cfc | 211 | |
107dab5c | 212 | static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { } |
81819f0f CL |
213 | #endif |
214 | ||
4fdccdfb | 215 | static inline void stat(const struct kmem_cache *s, enum stat_item si) |
8ff12cfc CL |
216 | { |
217 | #ifdef CONFIG_SLUB_STATS | |
84e554e6 | 218 | __this_cpu_inc(s->cpu_slab->stat[si]); |
8ff12cfc CL |
219 | #endif |
220 | } | |
221 | ||
81819f0f CL |
222 | /******************************************************************** |
223 | * Core slab cache functions | |
224 | *******************************************************************/ | |
225 | ||
81819f0f CL |
226 | static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) |
227 | { | |
81819f0f | 228 | return s->node[node]; |
81819f0f CL |
229 | } |
230 | ||
6446faa2 | 231 | /* Verify that a pointer has an address that is valid within a slab page */ |
02cbc874 CL |
232 | static inline int check_valid_pointer(struct kmem_cache *s, |
233 | struct page *page, const void *object) | |
234 | { | |
235 | void *base; | |
236 | ||
a973e9dd | 237 | if (!object) |
02cbc874 CL |
238 | return 1; |
239 | ||
a973e9dd | 240 | base = page_address(page); |
39b26464 | 241 | if (object < base || object >= base + page->objects * s->size || |
02cbc874 CL |
242 | (object - base) % s->size) { |
243 | return 0; | |
244 | } | |
245 | ||
246 | return 1; | |
247 | } | |
248 | ||
7656c72b CL |
249 | static inline void *get_freepointer(struct kmem_cache *s, void *object) |
250 | { | |
251 | return *(void **)(object + s->offset); | |
252 | } | |
253 | ||
0ad9500e ED |
254 | static void prefetch_freepointer(const struct kmem_cache *s, void *object) |
255 | { | |
256 | prefetch(object + s->offset); | |
257 | } | |
258 | ||
1393d9a1 CL |
259 | static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) |
260 | { | |
261 | void *p; | |
262 | ||
263 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
264 | probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p)); | |
265 | #else | |
266 | p = get_freepointer(s, object); | |
267 | #endif | |
268 | return p; | |
269 | } | |
270 | ||
7656c72b CL |
271 | static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) |
272 | { | |
273 | *(void **)(object + s->offset) = fp; | |
274 | } | |
275 | ||
276 | /* Loop over all objects in a slab */ | |
224a88be CL |
277 | #define for_each_object(__p, __s, __addr, __objects) \ |
278 | for (__p = (__addr); __p < (__addr) + (__objects) * (__s)->size;\ | |
7656c72b CL |
279 | __p += (__s)->size) |
280 | ||
7656c72b CL |
281 | /* Determine object index from a given position */ |
282 | static inline int slab_index(void *p, struct kmem_cache *s, void *addr) | |
283 | { | |
284 | return (p - addr) / s->size; | |
285 | } | |
286 | ||
d71f606f MK |
287 | static inline size_t slab_ksize(const struct kmem_cache *s) |
288 | { | |
289 | #ifdef CONFIG_SLUB_DEBUG | |
290 | /* | |
291 | * Debugging requires use of the padding between object | |
292 | * and whatever may come after it. | |
293 | */ | |
294 | if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) | |
3b0efdfa | 295 | return s->object_size; |
d71f606f MK |
296 | |
297 | #endif | |
298 | /* | |
299 | * If we have the need to store the freelist pointer | |
300 | * back there or track user information then we can | |
301 | * only use the space before that information. | |
302 | */ | |
303 | if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER)) | |
304 | return s->inuse; | |
305 | /* | |
306 | * Else we can use all the padding etc for the allocation | |
307 | */ | |
308 | return s->size; | |
309 | } | |
310 | ||
ab9a0f19 LJ |
311 | static inline int order_objects(int order, unsigned long size, int reserved) |
312 | { | |
313 | return ((PAGE_SIZE << order) - reserved) / size; | |
314 | } | |
315 | ||
834f3d11 | 316 | static inline struct kmem_cache_order_objects oo_make(int order, |
ab9a0f19 | 317 | unsigned long size, int reserved) |
834f3d11 CL |
318 | { |
319 | struct kmem_cache_order_objects x = { | |
ab9a0f19 | 320 | (order << OO_SHIFT) + order_objects(order, size, reserved) |
834f3d11 CL |
321 | }; |
322 | ||
323 | return x; | |
324 | } | |
325 | ||
326 | static inline int oo_order(struct kmem_cache_order_objects x) | |
327 | { | |
210b5c06 | 328 | return x.x >> OO_SHIFT; |
834f3d11 CL |
329 | } |
330 | ||
331 | static inline int oo_objects(struct kmem_cache_order_objects x) | |
332 | { | |
210b5c06 | 333 | return x.x & OO_MASK; |
834f3d11 CL |
334 | } |
335 | ||
881db7fb CL |
336 | /* |
337 | * Per slab locking using the pagelock | |
338 | */ | |
339 | static __always_inline void slab_lock(struct page *page) | |
340 | { | |
341 | bit_spin_lock(PG_locked, &page->flags); | |
342 | } | |
343 | ||
344 | static __always_inline void slab_unlock(struct page *page) | |
345 | { | |
346 | __bit_spin_unlock(PG_locked, &page->flags); | |
347 | } | |
348 | ||
1d07171c CL |
349 | /* Interrupts must be disabled (for the fallback code to work right) */ |
350 | static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page, | |
351 | void *freelist_old, unsigned long counters_old, | |
352 | void *freelist_new, unsigned long counters_new, | |
353 | const char *n) | |
354 | { | |
355 | VM_BUG_ON(!irqs_disabled()); | |
2565409f HC |
356 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
357 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
1d07171c | 358 | if (s->flags & __CMPXCHG_DOUBLE) { |
cdcd6298 | 359 | if (cmpxchg_double(&page->freelist, &page->counters, |
1d07171c CL |
360 | freelist_old, counters_old, |
361 | freelist_new, counters_new)) | |
362 | return 1; | |
363 | } else | |
364 | #endif | |
365 | { | |
366 | slab_lock(page); | |
367 | if (page->freelist == freelist_old && page->counters == counters_old) { | |
368 | page->freelist = freelist_new; | |
369 | page->counters = counters_new; | |
370 | slab_unlock(page); | |
371 | return 1; | |
372 | } | |
373 | slab_unlock(page); | |
374 | } | |
375 | ||
376 | cpu_relax(); | |
377 | stat(s, CMPXCHG_DOUBLE_FAIL); | |
378 | ||
379 | #ifdef SLUB_DEBUG_CMPXCHG | |
380 | printk(KERN_INFO "%s %s: cmpxchg double redo ", n, s->name); | |
381 | #endif | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
b789ef51 CL |
386 | static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
387 | void *freelist_old, unsigned long counters_old, | |
388 | void *freelist_new, unsigned long counters_new, | |
389 | const char *n) | |
390 | { | |
2565409f HC |
391 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
392 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
b789ef51 | 393 | if (s->flags & __CMPXCHG_DOUBLE) { |
cdcd6298 | 394 | if (cmpxchg_double(&page->freelist, &page->counters, |
b789ef51 CL |
395 | freelist_old, counters_old, |
396 | freelist_new, counters_new)) | |
397 | return 1; | |
398 | } else | |
399 | #endif | |
400 | { | |
1d07171c CL |
401 | unsigned long flags; |
402 | ||
403 | local_irq_save(flags); | |
881db7fb | 404 | slab_lock(page); |
b789ef51 CL |
405 | if (page->freelist == freelist_old && page->counters == counters_old) { |
406 | page->freelist = freelist_new; | |
407 | page->counters = counters_new; | |
881db7fb | 408 | slab_unlock(page); |
1d07171c | 409 | local_irq_restore(flags); |
b789ef51 CL |
410 | return 1; |
411 | } | |
881db7fb | 412 | slab_unlock(page); |
1d07171c | 413 | local_irq_restore(flags); |
b789ef51 CL |
414 | } |
415 | ||
416 | cpu_relax(); | |
417 | stat(s, CMPXCHG_DOUBLE_FAIL); | |
418 | ||
419 | #ifdef SLUB_DEBUG_CMPXCHG | |
420 | printk(KERN_INFO "%s %s: cmpxchg double redo ", n, s->name); | |
421 | #endif | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
41ecc55b | 426 | #ifdef CONFIG_SLUB_DEBUG |
5f80b13a CL |
427 | /* |
428 | * Determine a map of object in use on a page. | |
429 | * | |
881db7fb | 430 | * Node listlock must be held to guarantee that the page does |
5f80b13a CL |
431 | * not vanish from under us. |
432 | */ | |
433 | static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map) | |
434 | { | |
435 | void *p; | |
436 | void *addr = page_address(page); | |
437 | ||
438 | for (p = page->freelist; p; p = get_freepointer(s, p)) | |
439 | set_bit(slab_index(p, s, addr), map); | |
440 | } | |
441 | ||
41ecc55b CL |
442 | /* |
443 | * Debug settings: | |
444 | */ | |
f0630fff CL |
445 | #ifdef CONFIG_SLUB_DEBUG_ON |
446 | static int slub_debug = DEBUG_DEFAULT_FLAGS; | |
447 | #else | |
41ecc55b | 448 | static int slub_debug; |
f0630fff | 449 | #endif |
41ecc55b CL |
450 | |
451 | static char *slub_debug_slabs; | |
fa5ec8a1 | 452 | static int disable_higher_order_debug; |
41ecc55b | 453 | |
81819f0f CL |
454 | /* |
455 | * Object debugging | |
456 | */ | |
457 | static void print_section(char *text, u8 *addr, unsigned int length) | |
458 | { | |
ffc79d28 SAS |
459 | print_hex_dump(KERN_ERR, text, DUMP_PREFIX_ADDRESS, 16, 1, addr, |
460 | length, 1); | |
81819f0f CL |
461 | } |
462 | ||
81819f0f CL |
463 | static struct track *get_track(struct kmem_cache *s, void *object, |
464 | enum track_item alloc) | |
465 | { | |
466 | struct track *p; | |
467 | ||
468 | if (s->offset) | |
469 | p = object + s->offset + sizeof(void *); | |
470 | else | |
471 | p = object + s->inuse; | |
472 | ||
473 | return p + alloc; | |
474 | } | |
475 | ||
476 | static void set_track(struct kmem_cache *s, void *object, | |
ce71e27c | 477 | enum track_item alloc, unsigned long addr) |
81819f0f | 478 | { |
1a00df4a | 479 | struct track *p = get_track(s, object, alloc); |
81819f0f | 480 | |
81819f0f | 481 | if (addr) { |
d6543e39 BG |
482 | #ifdef CONFIG_STACKTRACE |
483 | struct stack_trace trace; | |
484 | int i; | |
485 | ||
486 | trace.nr_entries = 0; | |
487 | trace.max_entries = TRACK_ADDRS_COUNT; | |
488 | trace.entries = p->addrs; | |
489 | trace.skip = 3; | |
490 | save_stack_trace(&trace); | |
491 | ||
492 | /* See rant in lockdep.c */ | |
493 | if (trace.nr_entries != 0 && | |
494 | trace.entries[trace.nr_entries - 1] == ULONG_MAX) | |
495 | trace.nr_entries--; | |
496 | ||
497 | for (i = trace.nr_entries; i < TRACK_ADDRS_COUNT; i++) | |
498 | p->addrs[i] = 0; | |
499 | #endif | |
81819f0f CL |
500 | p->addr = addr; |
501 | p->cpu = smp_processor_id(); | |
88e4ccf2 | 502 | p->pid = current->pid; |
81819f0f CL |
503 | p->when = jiffies; |
504 | } else | |
505 | memset(p, 0, sizeof(struct track)); | |
506 | } | |
507 | ||
81819f0f CL |
508 | static void init_tracking(struct kmem_cache *s, void *object) |
509 | { | |
24922684 CL |
510 | if (!(s->flags & SLAB_STORE_USER)) |
511 | return; | |
512 | ||
ce71e27c EGM |
513 | set_track(s, object, TRACK_FREE, 0UL); |
514 | set_track(s, object, TRACK_ALLOC, 0UL); | |
81819f0f CL |
515 | } |
516 | ||
517 | static void print_track(const char *s, struct track *t) | |
518 | { | |
519 | if (!t->addr) | |
520 | return; | |
521 | ||
7daf705f | 522 | printk(KERN_ERR "INFO: %s in %pS age=%lu cpu=%u pid=%d\n", |
ce71e27c | 523 | s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); |
d6543e39 BG |
524 | #ifdef CONFIG_STACKTRACE |
525 | { | |
526 | int i; | |
527 | for (i = 0; i < TRACK_ADDRS_COUNT; i++) | |
528 | if (t->addrs[i]) | |
529 | printk(KERN_ERR "\t%pS\n", (void *)t->addrs[i]); | |
530 | else | |
531 | break; | |
532 | } | |
533 | #endif | |
24922684 CL |
534 | } |
535 | ||
536 | static void print_tracking(struct kmem_cache *s, void *object) | |
537 | { | |
538 | if (!(s->flags & SLAB_STORE_USER)) | |
539 | return; | |
540 | ||
541 | print_track("Allocated", get_track(s, object, TRACK_ALLOC)); | |
542 | print_track("Freed", get_track(s, object, TRACK_FREE)); | |
543 | } | |
544 | ||
545 | static void print_page_info(struct page *page) | |
546 | { | |
39b26464 CL |
547 | printk(KERN_ERR "INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n", |
548 | page, page->objects, page->inuse, page->freelist, page->flags); | |
24922684 CL |
549 | |
550 | } | |
551 | ||
552 | static void slab_bug(struct kmem_cache *s, char *fmt, ...) | |
553 | { | |
554 | va_list args; | |
555 | char buf[100]; | |
556 | ||
557 | va_start(args, fmt); | |
558 | vsnprintf(buf, sizeof(buf), fmt, args); | |
559 | va_end(args); | |
560 | printk(KERN_ERR "========================================" | |
561 | "=====================================\n"); | |
265d47e7 | 562 | printk(KERN_ERR "BUG %s (%s): %s\n", s->name, print_tainted(), buf); |
24922684 CL |
563 | printk(KERN_ERR "----------------------------------------" |
564 | "-------------------------------------\n\n"); | |
645df230 | 565 | |
373d4d09 | 566 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
81819f0f CL |
567 | } |
568 | ||
24922684 CL |
569 | static void slab_fix(struct kmem_cache *s, char *fmt, ...) |
570 | { | |
571 | va_list args; | |
572 | char buf[100]; | |
573 | ||
574 | va_start(args, fmt); | |
575 | vsnprintf(buf, sizeof(buf), fmt, args); | |
576 | va_end(args); | |
577 | printk(KERN_ERR "FIX %s: %s\n", s->name, buf); | |
578 | } | |
579 | ||
580 | static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) | |
81819f0f CL |
581 | { |
582 | unsigned int off; /* Offset of last byte */ | |
a973e9dd | 583 | u8 *addr = page_address(page); |
24922684 CL |
584 | |
585 | print_tracking(s, p); | |
586 | ||
587 | print_page_info(page); | |
588 | ||
589 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu fp=0x%p\n\n", | |
590 | p, p - addr, get_freepointer(s, p)); | |
591 | ||
592 | if (p > addr + 16) | |
ffc79d28 | 593 | print_section("Bytes b4 ", p - 16, 16); |
81819f0f | 594 | |
3b0efdfa | 595 | print_section("Object ", p, min_t(unsigned long, s->object_size, |
ffc79d28 | 596 | PAGE_SIZE)); |
81819f0f | 597 | if (s->flags & SLAB_RED_ZONE) |
3b0efdfa CL |
598 | print_section("Redzone ", p + s->object_size, |
599 | s->inuse - s->object_size); | |
81819f0f | 600 | |
81819f0f CL |
601 | if (s->offset) |
602 | off = s->offset + sizeof(void *); | |
603 | else | |
604 | off = s->inuse; | |
605 | ||
24922684 | 606 | if (s->flags & SLAB_STORE_USER) |
81819f0f | 607 | off += 2 * sizeof(struct track); |
81819f0f CL |
608 | |
609 | if (off != s->size) | |
610 | /* Beginning of the filler is the free pointer */ | |
ffc79d28 | 611 | print_section("Padding ", p + off, s->size - off); |
24922684 CL |
612 | |
613 | dump_stack(); | |
81819f0f CL |
614 | } |
615 | ||
616 | static void object_err(struct kmem_cache *s, struct page *page, | |
617 | u8 *object, char *reason) | |
618 | { | |
3dc50637 | 619 | slab_bug(s, "%s", reason); |
24922684 | 620 | print_trailer(s, page, object); |
81819f0f CL |
621 | } |
622 | ||
945cf2b6 | 623 | static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...) |
81819f0f CL |
624 | { |
625 | va_list args; | |
626 | char buf[100]; | |
627 | ||
24922684 CL |
628 | va_start(args, fmt); |
629 | vsnprintf(buf, sizeof(buf), fmt, args); | |
81819f0f | 630 | va_end(args); |
3dc50637 | 631 | slab_bug(s, "%s", buf); |
24922684 | 632 | print_page_info(page); |
81819f0f CL |
633 | dump_stack(); |
634 | } | |
635 | ||
f7cb1933 | 636 | static void init_object(struct kmem_cache *s, void *object, u8 val) |
81819f0f CL |
637 | { |
638 | u8 *p = object; | |
639 | ||
640 | if (s->flags & __OBJECT_POISON) { | |
3b0efdfa CL |
641 | memset(p, POISON_FREE, s->object_size - 1); |
642 | p[s->object_size - 1] = POISON_END; | |
81819f0f CL |
643 | } |
644 | ||
645 | if (s->flags & SLAB_RED_ZONE) | |
3b0efdfa | 646 | memset(p + s->object_size, val, s->inuse - s->object_size); |
81819f0f CL |
647 | } |
648 | ||
24922684 CL |
649 | static void restore_bytes(struct kmem_cache *s, char *message, u8 data, |
650 | void *from, void *to) | |
651 | { | |
652 | slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data); | |
653 | memset(from, data, to - from); | |
654 | } | |
655 | ||
656 | static int check_bytes_and_report(struct kmem_cache *s, struct page *page, | |
657 | u8 *object, char *what, | |
06428780 | 658 | u8 *start, unsigned int value, unsigned int bytes) |
24922684 CL |
659 | { |
660 | u8 *fault; | |
661 | u8 *end; | |
662 | ||
79824820 | 663 | fault = memchr_inv(start, value, bytes); |
24922684 CL |
664 | if (!fault) |
665 | return 1; | |
666 | ||
667 | end = start + bytes; | |
668 | while (end > fault && end[-1] == value) | |
669 | end--; | |
670 | ||
671 | slab_bug(s, "%s overwritten", what); | |
672 | printk(KERN_ERR "INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n", | |
673 | fault, end - 1, fault[0], value); | |
674 | print_trailer(s, page, object); | |
675 | ||
676 | restore_bytes(s, what, value, fault, end); | |
677 | return 0; | |
81819f0f CL |
678 | } |
679 | ||
81819f0f CL |
680 | /* |
681 | * Object layout: | |
682 | * | |
683 | * object address | |
684 | * Bytes of the object to be managed. | |
685 | * If the freepointer may overlay the object then the free | |
686 | * pointer is the first word of the object. | |
672bba3a | 687 | * |
81819f0f CL |
688 | * Poisoning uses 0x6b (POISON_FREE) and the last byte is |
689 | * 0xa5 (POISON_END) | |
690 | * | |
3b0efdfa | 691 | * object + s->object_size |
81819f0f | 692 | * Padding to reach word boundary. This is also used for Redzoning. |
672bba3a | 693 | * Padding is extended by another word if Redzoning is enabled and |
3b0efdfa | 694 | * object_size == inuse. |
672bba3a | 695 | * |
81819f0f CL |
696 | * We fill with 0xbb (RED_INACTIVE) for inactive objects and with |
697 | * 0xcc (RED_ACTIVE) for objects in use. | |
698 | * | |
699 | * object + s->inuse | |
672bba3a CL |
700 | * Meta data starts here. |
701 | * | |
81819f0f CL |
702 | * A. Free pointer (if we cannot overwrite object on free) |
703 | * B. Tracking data for SLAB_STORE_USER | |
672bba3a | 704 | * C. Padding to reach required alignment boundary or at mininum |
6446faa2 | 705 | * one word if debugging is on to be able to detect writes |
672bba3a CL |
706 | * before the word boundary. |
707 | * | |
708 | * Padding is done using 0x5a (POISON_INUSE) | |
81819f0f CL |
709 | * |
710 | * object + s->size | |
672bba3a | 711 | * Nothing is used beyond s->size. |
81819f0f | 712 | * |
3b0efdfa | 713 | * If slabcaches are merged then the object_size and inuse boundaries are mostly |
672bba3a | 714 | * ignored. And therefore no slab options that rely on these boundaries |
81819f0f CL |
715 | * may be used with merged slabcaches. |
716 | */ | |
717 | ||
81819f0f CL |
718 | static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) |
719 | { | |
720 | unsigned long off = s->inuse; /* The end of info */ | |
721 | ||
722 | if (s->offset) | |
723 | /* Freepointer is placed after the object. */ | |
724 | off += sizeof(void *); | |
725 | ||
726 | if (s->flags & SLAB_STORE_USER) | |
727 | /* We also have user information there */ | |
728 | off += 2 * sizeof(struct track); | |
729 | ||
730 | if (s->size == off) | |
731 | return 1; | |
732 | ||
24922684 CL |
733 | return check_bytes_and_report(s, page, p, "Object padding", |
734 | p + off, POISON_INUSE, s->size - off); | |
81819f0f CL |
735 | } |
736 | ||
39b26464 | 737 | /* Check the pad bytes at the end of a slab page */ |
81819f0f CL |
738 | static int slab_pad_check(struct kmem_cache *s, struct page *page) |
739 | { | |
24922684 CL |
740 | u8 *start; |
741 | u8 *fault; | |
742 | u8 *end; | |
743 | int length; | |
744 | int remainder; | |
81819f0f CL |
745 | |
746 | if (!(s->flags & SLAB_POISON)) | |
747 | return 1; | |
748 | ||
a973e9dd | 749 | start = page_address(page); |
ab9a0f19 | 750 | length = (PAGE_SIZE << compound_order(page)) - s->reserved; |
39b26464 CL |
751 | end = start + length; |
752 | remainder = length % s->size; | |
81819f0f CL |
753 | if (!remainder) |
754 | return 1; | |
755 | ||
79824820 | 756 | fault = memchr_inv(end - remainder, POISON_INUSE, remainder); |
24922684 CL |
757 | if (!fault) |
758 | return 1; | |
759 | while (end > fault && end[-1] == POISON_INUSE) | |
760 | end--; | |
761 | ||
762 | slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1); | |
ffc79d28 | 763 | print_section("Padding ", end - remainder, remainder); |
24922684 | 764 | |
8a3d271d | 765 | restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end); |
24922684 | 766 | return 0; |
81819f0f CL |
767 | } |
768 | ||
769 | static int check_object(struct kmem_cache *s, struct page *page, | |
f7cb1933 | 770 | void *object, u8 val) |
81819f0f CL |
771 | { |
772 | u8 *p = object; | |
3b0efdfa | 773 | u8 *endobject = object + s->object_size; |
81819f0f CL |
774 | |
775 | if (s->flags & SLAB_RED_ZONE) { | |
24922684 | 776 | if (!check_bytes_and_report(s, page, object, "Redzone", |
3b0efdfa | 777 | endobject, val, s->inuse - s->object_size)) |
81819f0f | 778 | return 0; |
81819f0f | 779 | } else { |
3b0efdfa | 780 | if ((s->flags & SLAB_POISON) && s->object_size < s->inuse) { |
3adbefee | 781 | check_bytes_and_report(s, page, p, "Alignment padding", |
3b0efdfa | 782 | endobject, POISON_INUSE, s->inuse - s->object_size); |
3adbefee | 783 | } |
81819f0f CL |
784 | } |
785 | ||
786 | if (s->flags & SLAB_POISON) { | |
f7cb1933 | 787 | if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) && |
24922684 | 788 | (!check_bytes_and_report(s, page, p, "Poison", p, |
3b0efdfa | 789 | POISON_FREE, s->object_size - 1) || |
24922684 | 790 | !check_bytes_and_report(s, page, p, "Poison", |
3b0efdfa | 791 | p + s->object_size - 1, POISON_END, 1))) |
81819f0f | 792 | return 0; |
81819f0f CL |
793 | /* |
794 | * check_pad_bytes cleans up on its own. | |
795 | */ | |
796 | check_pad_bytes(s, page, p); | |
797 | } | |
798 | ||
f7cb1933 | 799 | if (!s->offset && val == SLUB_RED_ACTIVE) |
81819f0f CL |
800 | /* |
801 | * Object and freepointer overlap. Cannot check | |
802 | * freepointer while object is allocated. | |
803 | */ | |
804 | return 1; | |
805 | ||
806 | /* Check free pointer validity */ | |
807 | if (!check_valid_pointer(s, page, get_freepointer(s, p))) { | |
808 | object_err(s, page, p, "Freepointer corrupt"); | |
809 | /* | |
9f6c708e | 810 | * No choice but to zap it and thus lose the remainder |
81819f0f | 811 | * of the free objects in this slab. May cause |
672bba3a | 812 | * another error because the object count is now wrong. |
81819f0f | 813 | */ |
a973e9dd | 814 | set_freepointer(s, p, NULL); |
81819f0f CL |
815 | return 0; |
816 | } | |
817 | return 1; | |
818 | } | |
819 | ||
820 | static int check_slab(struct kmem_cache *s, struct page *page) | |
821 | { | |
39b26464 CL |
822 | int maxobj; |
823 | ||
81819f0f CL |
824 | VM_BUG_ON(!irqs_disabled()); |
825 | ||
826 | if (!PageSlab(page)) { | |
24922684 | 827 | slab_err(s, page, "Not a valid slab page"); |
81819f0f CL |
828 | return 0; |
829 | } | |
39b26464 | 830 | |
ab9a0f19 | 831 | maxobj = order_objects(compound_order(page), s->size, s->reserved); |
39b26464 CL |
832 | if (page->objects > maxobj) { |
833 | slab_err(s, page, "objects %u > max %u", | |
834 | s->name, page->objects, maxobj); | |
835 | return 0; | |
836 | } | |
837 | if (page->inuse > page->objects) { | |
24922684 | 838 | slab_err(s, page, "inuse %u > max %u", |
39b26464 | 839 | s->name, page->inuse, page->objects); |
81819f0f CL |
840 | return 0; |
841 | } | |
842 | /* Slab_pad_check fixes things up after itself */ | |
843 | slab_pad_check(s, page); | |
844 | return 1; | |
845 | } | |
846 | ||
847 | /* | |
672bba3a CL |
848 | * Determine if a certain object on a page is on the freelist. Must hold the |
849 | * slab lock to guarantee that the chains are in a consistent state. | |
81819f0f CL |
850 | */ |
851 | static int on_freelist(struct kmem_cache *s, struct page *page, void *search) | |
852 | { | |
853 | int nr = 0; | |
881db7fb | 854 | void *fp; |
81819f0f | 855 | void *object = NULL; |
224a88be | 856 | unsigned long max_objects; |
81819f0f | 857 | |
881db7fb | 858 | fp = page->freelist; |
39b26464 | 859 | while (fp && nr <= page->objects) { |
81819f0f CL |
860 | if (fp == search) |
861 | return 1; | |
862 | if (!check_valid_pointer(s, page, fp)) { | |
863 | if (object) { | |
864 | object_err(s, page, object, | |
865 | "Freechain corrupt"); | |
a973e9dd | 866 | set_freepointer(s, object, NULL); |
81819f0f CL |
867 | break; |
868 | } else { | |
24922684 | 869 | slab_err(s, page, "Freepointer corrupt"); |
a973e9dd | 870 | page->freelist = NULL; |
39b26464 | 871 | page->inuse = page->objects; |
24922684 | 872 | slab_fix(s, "Freelist cleared"); |
81819f0f CL |
873 | return 0; |
874 | } | |
875 | break; | |
876 | } | |
877 | object = fp; | |
878 | fp = get_freepointer(s, object); | |
879 | nr++; | |
880 | } | |
881 | ||
ab9a0f19 | 882 | max_objects = order_objects(compound_order(page), s->size, s->reserved); |
210b5c06 CG |
883 | if (max_objects > MAX_OBJS_PER_PAGE) |
884 | max_objects = MAX_OBJS_PER_PAGE; | |
224a88be CL |
885 | |
886 | if (page->objects != max_objects) { | |
887 | slab_err(s, page, "Wrong number of objects. Found %d but " | |
888 | "should be %d", page->objects, max_objects); | |
889 | page->objects = max_objects; | |
890 | slab_fix(s, "Number of objects adjusted."); | |
891 | } | |
39b26464 | 892 | if (page->inuse != page->objects - nr) { |
70d71228 | 893 | slab_err(s, page, "Wrong object count. Counter is %d but " |
39b26464 CL |
894 | "counted were %d", page->inuse, page->objects - nr); |
895 | page->inuse = page->objects - nr; | |
24922684 | 896 | slab_fix(s, "Object count adjusted."); |
81819f0f CL |
897 | } |
898 | return search == NULL; | |
899 | } | |
900 | ||
0121c619 CL |
901 | static void trace(struct kmem_cache *s, struct page *page, void *object, |
902 | int alloc) | |
3ec09742 CL |
903 | { |
904 | if (s->flags & SLAB_TRACE) { | |
905 | printk(KERN_INFO "TRACE %s %s 0x%p inuse=%d fp=0x%p\n", | |
906 | s->name, | |
907 | alloc ? "alloc" : "free", | |
908 | object, page->inuse, | |
909 | page->freelist); | |
910 | ||
911 | if (!alloc) | |
3b0efdfa | 912 | print_section("Object ", (void *)object, s->object_size); |
3ec09742 CL |
913 | |
914 | dump_stack(); | |
915 | } | |
916 | } | |
917 | ||
c016b0bd CL |
918 | /* |
919 | * Hooks for other subsystems that check memory allocations. In a typical | |
920 | * production configuration these hooks all should produce no code at all. | |
921 | */ | |
922 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) | |
923 | { | |
c1d50836 | 924 | flags &= gfp_allowed_mask; |
c016b0bd CL |
925 | lockdep_trace_alloc(flags); |
926 | might_sleep_if(flags & __GFP_WAIT); | |
927 | ||
3b0efdfa | 928 | return should_failslab(s->object_size, flags, s->flags); |
c016b0bd CL |
929 | } |
930 | ||
931 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, void *object) | |
932 | { | |
c1d50836 | 933 | flags &= gfp_allowed_mask; |
b3d41885 | 934 | kmemcheck_slab_alloc(s, flags, object, slab_ksize(s)); |
3b0efdfa | 935 | kmemleak_alloc_recursive(object, s->object_size, 1, s->flags, flags); |
c016b0bd CL |
936 | } |
937 | ||
938 | static inline void slab_free_hook(struct kmem_cache *s, void *x) | |
939 | { | |
940 | kmemleak_free_recursive(x, s->flags); | |
c016b0bd | 941 | |
d3f661d6 CL |
942 | /* |
943 | * Trouble is that we may no longer disable interupts in the fast path | |
944 | * So in order to make the debug calls that expect irqs to be | |
945 | * disabled we need to disable interrupts temporarily. | |
946 | */ | |
947 | #if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP) | |
948 | { | |
949 | unsigned long flags; | |
950 | ||
951 | local_irq_save(flags); | |
3b0efdfa CL |
952 | kmemcheck_slab_free(s, x, s->object_size); |
953 | debug_check_no_locks_freed(x, s->object_size); | |
d3f661d6 CL |
954 | local_irq_restore(flags); |
955 | } | |
956 | #endif | |
f9b615de | 957 | if (!(s->flags & SLAB_DEBUG_OBJECTS)) |
3b0efdfa | 958 | debug_check_no_obj_freed(x, s->object_size); |
c016b0bd CL |
959 | } |
960 | ||
643b1138 | 961 | /* |
672bba3a | 962 | * Tracking of fully allocated slabs for debugging purposes. |
5cc6eee8 CL |
963 | * |
964 | * list_lock must be held. | |
643b1138 | 965 | */ |
5cc6eee8 CL |
966 | static void add_full(struct kmem_cache *s, |
967 | struct kmem_cache_node *n, struct page *page) | |
643b1138 | 968 | { |
5cc6eee8 CL |
969 | if (!(s->flags & SLAB_STORE_USER)) |
970 | return; | |
971 | ||
643b1138 | 972 | list_add(&page->lru, &n->full); |
643b1138 CL |
973 | } |
974 | ||
5cc6eee8 CL |
975 | /* |
976 | * list_lock must be held. | |
977 | */ | |
643b1138 CL |
978 | static void remove_full(struct kmem_cache *s, struct page *page) |
979 | { | |
643b1138 CL |
980 | if (!(s->flags & SLAB_STORE_USER)) |
981 | return; | |
982 | ||
643b1138 | 983 | list_del(&page->lru); |
643b1138 CL |
984 | } |
985 | ||
0f389ec6 CL |
986 | /* Tracking of the number of slabs for debugging purposes */ |
987 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) | |
988 | { | |
989 | struct kmem_cache_node *n = get_node(s, node); | |
990 | ||
991 | return atomic_long_read(&n->nr_slabs); | |
992 | } | |
993 | ||
26c02cf0 AB |
994 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
995 | { | |
996 | return atomic_long_read(&n->nr_slabs); | |
997 | } | |
998 | ||
205ab99d | 999 | static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects) |
0f389ec6 CL |
1000 | { |
1001 | struct kmem_cache_node *n = get_node(s, node); | |
1002 | ||
1003 | /* | |
1004 | * May be called early in order to allocate a slab for the | |
1005 | * kmem_cache_node structure. Solve the chicken-egg | |
1006 | * dilemma by deferring the increment of the count during | |
1007 | * bootstrap (see early_kmem_cache_node_alloc). | |
1008 | */ | |
338b2642 | 1009 | if (likely(n)) { |
0f389ec6 | 1010 | atomic_long_inc(&n->nr_slabs); |
205ab99d CL |
1011 | atomic_long_add(objects, &n->total_objects); |
1012 | } | |
0f389ec6 | 1013 | } |
205ab99d | 1014 | static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects) |
0f389ec6 CL |
1015 | { |
1016 | struct kmem_cache_node *n = get_node(s, node); | |
1017 | ||
1018 | atomic_long_dec(&n->nr_slabs); | |
205ab99d | 1019 | atomic_long_sub(objects, &n->total_objects); |
0f389ec6 CL |
1020 | } |
1021 | ||
1022 | /* Object debug checks for alloc/free paths */ | |
3ec09742 CL |
1023 | static void setup_object_debug(struct kmem_cache *s, struct page *page, |
1024 | void *object) | |
1025 | { | |
1026 | if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON))) | |
1027 | return; | |
1028 | ||
f7cb1933 | 1029 | init_object(s, object, SLUB_RED_INACTIVE); |
3ec09742 CL |
1030 | init_tracking(s, object); |
1031 | } | |
1032 | ||
1537066c | 1033 | static noinline int alloc_debug_processing(struct kmem_cache *s, struct page *page, |
ce71e27c | 1034 | void *object, unsigned long addr) |
81819f0f CL |
1035 | { |
1036 | if (!check_slab(s, page)) | |
1037 | goto bad; | |
1038 | ||
81819f0f CL |
1039 | if (!check_valid_pointer(s, page, object)) { |
1040 | object_err(s, page, object, "Freelist Pointer check fails"); | |
70d71228 | 1041 | goto bad; |
81819f0f CL |
1042 | } |
1043 | ||
f7cb1933 | 1044 | if (!check_object(s, page, object, SLUB_RED_INACTIVE)) |
81819f0f | 1045 | goto bad; |
81819f0f | 1046 | |
3ec09742 CL |
1047 | /* Success perform special debug activities for allocs */ |
1048 | if (s->flags & SLAB_STORE_USER) | |
1049 | set_track(s, object, TRACK_ALLOC, addr); | |
1050 | trace(s, page, object, 1); | |
f7cb1933 | 1051 | init_object(s, object, SLUB_RED_ACTIVE); |
81819f0f | 1052 | return 1; |
3ec09742 | 1053 | |
81819f0f CL |
1054 | bad: |
1055 | if (PageSlab(page)) { | |
1056 | /* | |
1057 | * If this is a slab page then lets do the best we can | |
1058 | * to avoid issues in the future. Marking all objects | |
672bba3a | 1059 | * as used avoids touching the remaining objects. |
81819f0f | 1060 | */ |
24922684 | 1061 | slab_fix(s, "Marking all objects used"); |
39b26464 | 1062 | page->inuse = page->objects; |
a973e9dd | 1063 | page->freelist = NULL; |
81819f0f CL |
1064 | } |
1065 | return 0; | |
1066 | } | |
1067 | ||
19c7ff9e CL |
1068 | static noinline struct kmem_cache_node *free_debug_processing( |
1069 | struct kmem_cache *s, struct page *page, void *object, | |
1070 | unsigned long addr, unsigned long *flags) | |
81819f0f | 1071 | { |
19c7ff9e | 1072 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
5c2e4bbb | 1073 | |
19c7ff9e | 1074 | spin_lock_irqsave(&n->list_lock, *flags); |
881db7fb CL |
1075 | slab_lock(page); |
1076 | ||
81819f0f CL |
1077 | if (!check_slab(s, page)) |
1078 | goto fail; | |
1079 | ||
1080 | if (!check_valid_pointer(s, page, object)) { | |
70d71228 | 1081 | slab_err(s, page, "Invalid object pointer 0x%p", object); |
81819f0f CL |
1082 | goto fail; |
1083 | } | |
1084 | ||
1085 | if (on_freelist(s, page, object)) { | |
24922684 | 1086 | object_err(s, page, object, "Object already free"); |
81819f0f CL |
1087 | goto fail; |
1088 | } | |
1089 | ||
f7cb1933 | 1090 | if (!check_object(s, page, object, SLUB_RED_ACTIVE)) |
5c2e4bbb | 1091 | goto out; |
81819f0f | 1092 | |
1b4f59e3 | 1093 | if (unlikely(s != page->slab_cache)) { |
3adbefee | 1094 | if (!PageSlab(page)) { |
70d71228 CL |
1095 | slab_err(s, page, "Attempt to free object(0x%p) " |
1096 | "outside of slab", object); | |
1b4f59e3 | 1097 | } else if (!page->slab_cache) { |
81819f0f | 1098 | printk(KERN_ERR |
70d71228 | 1099 | "SLUB <none>: no slab for object 0x%p.\n", |
81819f0f | 1100 | object); |
70d71228 | 1101 | dump_stack(); |
06428780 | 1102 | } else |
24922684 CL |
1103 | object_err(s, page, object, |
1104 | "page slab pointer corrupt."); | |
81819f0f CL |
1105 | goto fail; |
1106 | } | |
3ec09742 | 1107 | |
3ec09742 CL |
1108 | if (s->flags & SLAB_STORE_USER) |
1109 | set_track(s, object, TRACK_FREE, addr); | |
1110 | trace(s, page, object, 0); | |
f7cb1933 | 1111 | init_object(s, object, SLUB_RED_INACTIVE); |
5c2e4bbb | 1112 | out: |
881db7fb | 1113 | slab_unlock(page); |
19c7ff9e CL |
1114 | /* |
1115 | * Keep node_lock to preserve integrity | |
1116 | * until the object is actually freed | |
1117 | */ | |
1118 | return n; | |
3ec09742 | 1119 | |
81819f0f | 1120 | fail: |
19c7ff9e CL |
1121 | slab_unlock(page); |
1122 | spin_unlock_irqrestore(&n->list_lock, *flags); | |
24922684 | 1123 | slab_fix(s, "Object at 0x%p not freed", object); |
19c7ff9e | 1124 | return NULL; |
81819f0f CL |
1125 | } |
1126 | ||
41ecc55b CL |
1127 | static int __init setup_slub_debug(char *str) |
1128 | { | |
f0630fff CL |
1129 | slub_debug = DEBUG_DEFAULT_FLAGS; |
1130 | if (*str++ != '=' || !*str) | |
1131 | /* | |
1132 | * No options specified. Switch on full debugging. | |
1133 | */ | |
1134 | goto out; | |
1135 | ||
1136 | if (*str == ',') | |
1137 | /* | |
1138 | * No options but restriction on slabs. This means full | |
1139 | * debugging for slabs matching a pattern. | |
1140 | */ | |
1141 | goto check_slabs; | |
1142 | ||
fa5ec8a1 DR |
1143 | if (tolower(*str) == 'o') { |
1144 | /* | |
1145 | * Avoid enabling debugging on caches if its minimum order | |
1146 | * would increase as a result. | |
1147 | */ | |
1148 | disable_higher_order_debug = 1; | |
1149 | goto out; | |
1150 | } | |
1151 | ||
f0630fff CL |
1152 | slub_debug = 0; |
1153 | if (*str == '-') | |
1154 | /* | |
1155 | * Switch off all debugging measures. | |
1156 | */ | |
1157 | goto out; | |
1158 | ||
1159 | /* | |
1160 | * Determine which debug features should be switched on | |
1161 | */ | |
06428780 | 1162 | for (; *str && *str != ','; str++) { |
f0630fff CL |
1163 | switch (tolower(*str)) { |
1164 | case 'f': | |
1165 | slub_debug |= SLAB_DEBUG_FREE; | |
1166 | break; | |
1167 | case 'z': | |
1168 | slub_debug |= SLAB_RED_ZONE; | |
1169 | break; | |
1170 | case 'p': | |
1171 | slub_debug |= SLAB_POISON; | |
1172 | break; | |
1173 | case 'u': | |
1174 | slub_debug |= SLAB_STORE_USER; | |
1175 | break; | |
1176 | case 't': | |
1177 | slub_debug |= SLAB_TRACE; | |
1178 | break; | |
4c13dd3b DM |
1179 | case 'a': |
1180 | slub_debug |= SLAB_FAILSLAB; | |
1181 | break; | |
f0630fff CL |
1182 | default: |
1183 | printk(KERN_ERR "slub_debug option '%c' " | |
06428780 | 1184 | "unknown. skipped\n", *str); |
f0630fff | 1185 | } |
41ecc55b CL |
1186 | } |
1187 | ||
f0630fff | 1188 | check_slabs: |
41ecc55b CL |
1189 | if (*str == ',') |
1190 | slub_debug_slabs = str + 1; | |
f0630fff | 1191 | out: |
41ecc55b CL |
1192 | return 1; |
1193 | } | |
1194 | ||
1195 | __setup("slub_debug", setup_slub_debug); | |
1196 | ||
3b0efdfa | 1197 | static unsigned long kmem_cache_flags(unsigned long object_size, |
ba0268a8 | 1198 | unsigned long flags, const char *name, |
51cc5068 | 1199 | void (*ctor)(void *)) |
41ecc55b CL |
1200 | { |
1201 | /* | |
e153362a | 1202 | * Enable debugging if selected on the kernel commandline. |
41ecc55b | 1203 | */ |
e153362a | 1204 | if (slub_debug && (!slub_debug_slabs || |
3de47213 DR |
1205 | !strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs)))) |
1206 | flags |= slub_debug; | |
ba0268a8 CL |
1207 | |
1208 | return flags; | |
41ecc55b CL |
1209 | } |
1210 | #else | |
3ec09742 CL |
1211 | static inline void setup_object_debug(struct kmem_cache *s, |
1212 | struct page *page, void *object) {} | |
41ecc55b | 1213 | |
3ec09742 | 1214 | static inline int alloc_debug_processing(struct kmem_cache *s, |
ce71e27c | 1215 | struct page *page, void *object, unsigned long addr) { return 0; } |
41ecc55b | 1216 | |
19c7ff9e CL |
1217 | static inline struct kmem_cache_node *free_debug_processing( |
1218 | struct kmem_cache *s, struct page *page, void *object, | |
1219 | unsigned long addr, unsigned long *flags) { return NULL; } | |
41ecc55b | 1220 | |
41ecc55b CL |
1221 | static inline int slab_pad_check(struct kmem_cache *s, struct page *page) |
1222 | { return 1; } | |
1223 | static inline int check_object(struct kmem_cache *s, struct page *page, | |
f7cb1933 | 1224 | void *object, u8 val) { return 1; } |
5cc6eee8 CL |
1225 | static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, |
1226 | struct page *page) {} | |
2cfb7455 | 1227 | static inline void remove_full(struct kmem_cache *s, struct page *page) {} |
3b0efdfa | 1228 | static inline unsigned long kmem_cache_flags(unsigned long object_size, |
ba0268a8 | 1229 | unsigned long flags, const char *name, |
51cc5068 | 1230 | void (*ctor)(void *)) |
ba0268a8 CL |
1231 | { |
1232 | return flags; | |
1233 | } | |
41ecc55b | 1234 | #define slub_debug 0 |
0f389ec6 | 1235 | |
fdaa45e9 IM |
1236 | #define disable_higher_order_debug 0 |
1237 | ||
0f389ec6 CL |
1238 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
1239 | { return 0; } | |
26c02cf0 AB |
1240 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
1241 | { return 0; } | |
205ab99d CL |
1242 | static inline void inc_slabs_node(struct kmem_cache *s, int node, |
1243 | int objects) {} | |
1244 | static inline void dec_slabs_node(struct kmem_cache *s, int node, | |
1245 | int objects) {} | |
7d550c56 CL |
1246 | |
1247 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) | |
1248 | { return 0; } | |
1249 | ||
1250 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, | |
1251 | void *object) {} | |
1252 | ||
1253 | static inline void slab_free_hook(struct kmem_cache *s, void *x) {} | |
1254 | ||
ab4d5ed5 | 1255 | #endif /* CONFIG_SLUB_DEBUG */ |
205ab99d | 1256 | |
81819f0f CL |
1257 | /* |
1258 | * Slab allocation and freeing | |
1259 | */ | |
65c3376a CL |
1260 | static inline struct page *alloc_slab_page(gfp_t flags, int node, |
1261 | struct kmem_cache_order_objects oo) | |
1262 | { | |
1263 | int order = oo_order(oo); | |
1264 | ||
b1eeab67 VN |
1265 | flags |= __GFP_NOTRACK; |
1266 | ||
2154a336 | 1267 | if (node == NUMA_NO_NODE) |
65c3376a CL |
1268 | return alloc_pages(flags, order); |
1269 | else | |
6b65aaf3 | 1270 | return alloc_pages_exact_node(node, flags, order); |
65c3376a CL |
1271 | } |
1272 | ||
81819f0f CL |
1273 | static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) |
1274 | { | |
06428780 | 1275 | struct page *page; |
834f3d11 | 1276 | struct kmem_cache_order_objects oo = s->oo; |
ba52270d | 1277 | gfp_t alloc_gfp; |
81819f0f | 1278 | |
7e0528da CL |
1279 | flags &= gfp_allowed_mask; |
1280 | ||
1281 | if (flags & __GFP_WAIT) | |
1282 | local_irq_enable(); | |
1283 | ||
b7a49f0d | 1284 | flags |= s->allocflags; |
e12ba74d | 1285 | |
ba52270d PE |
1286 | /* |
1287 | * Let the initial higher-order allocation fail under memory pressure | |
1288 | * so we fall-back to the minimum order allocation. | |
1289 | */ | |
1290 | alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; | |
1291 | ||
1292 | page = alloc_slab_page(alloc_gfp, node, oo); | |
65c3376a CL |
1293 | if (unlikely(!page)) { |
1294 | oo = s->min; | |
1295 | /* | |
1296 | * Allocation may have failed due to fragmentation. | |
1297 | * Try a lower order alloc if possible | |
1298 | */ | |
1299 | page = alloc_slab_page(flags, node, oo); | |
81819f0f | 1300 | |
7e0528da CL |
1301 | if (page) |
1302 | stat(s, ORDER_FALLBACK); | |
65c3376a | 1303 | } |
5a896d9e | 1304 | |
737b719e | 1305 | if (kmemcheck_enabled && page |
5086c389 | 1306 | && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { |
b1eeab67 VN |
1307 | int pages = 1 << oo_order(oo); |
1308 | ||
1309 | kmemcheck_alloc_shadow(page, oo_order(oo), flags, node); | |
1310 | ||
1311 | /* | |
1312 | * Objects from caches that have a constructor don't get | |
1313 | * cleared when they're allocated, so we need to do it here. | |
1314 | */ | |
1315 | if (s->ctor) | |
1316 | kmemcheck_mark_uninitialized_pages(page, pages); | |
1317 | else | |
1318 | kmemcheck_mark_unallocated_pages(page, pages); | |
5a896d9e VN |
1319 | } |
1320 | ||
737b719e DR |
1321 | if (flags & __GFP_WAIT) |
1322 | local_irq_disable(); | |
1323 | if (!page) | |
1324 | return NULL; | |
1325 | ||
834f3d11 | 1326 | page->objects = oo_objects(oo); |
81819f0f CL |
1327 | mod_zone_page_state(page_zone(page), |
1328 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? | |
1329 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, | |
65c3376a | 1330 | 1 << oo_order(oo)); |
81819f0f CL |
1331 | |
1332 | return page; | |
1333 | } | |
1334 | ||
1335 | static void setup_object(struct kmem_cache *s, struct page *page, | |
1336 | void *object) | |
1337 | { | |
3ec09742 | 1338 | setup_object_debug(s, page, object); |
4f104934 | 1339 | if (unlikely(s->ctor)) |
51cc5068 | 1340 | s->ctor(object); |
81819f0f CL |
1341 | } |
1342 | ||
1343 | static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) | |
1344 | { | |
1345 | struct page *page; | |
81819f0f | 1346 | void *start; |
81819f0f CL |
1347 | void *last; |
1348 | void *p; | |
1f458cbf | 1349 | int order; |
81819f0f | 1350 | |
6cb06229 | 1351 | BUG_ON(flags & GFP_SLAB_BUG_MASK); |
81819f0f | 1352 | |
6cb06229 CL |
1353 | page = allocate_slab(s, |
1354 | flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); | |
81819f0f CL |
1355 | if (!page) |
1356 | goto out; | |
1357 | ||
1f458cbf | 1358 | order = compound_order(page); |
205ab99d | 1359 | inc_slabs_node(s, page_to_nid(page), page->objects); |
1f458cbf | 1360 | memcg_bind_pages(s, order); |
1b4f59e3 | 1361 | page->slab_cache = s; |
c03f94cc | 1362 | __SetPageSlab(page); |
072bb0aa MG |
1363 | if (page->pfmemalloc) |
1364 | SetPageSlabPfmemalloc(page); | |
81819f0f CL |
1365 | |
1366 | start = page_address(page); | |
81819f0f CL |
1367 | |
1368 | if (unlikely(s->flags & SLAB_POISON)) | |
1f458cbf | 1369 | memset(start, POISON_INUSE, PAGE_SIZE << order); |
81819f0f CL |
1370 | |
1371 | last = start; | |
224a88be | 1372 | for_each_object(p, s, start, page->objects) { |
81819f0f CL |
1373 | setup_object(s, page, last); |
1374 | set_freepointer(s, last, p); | |
1375 | last = p; | |
1376 | } | |
1377 | setup_object(s, page, last); | |
a973e9dd | 1378 | set_freepointer(s, last, NULL); |
81819f0f CL |
1379 | |
1380 | page->freelist = start; | |
e6e82ea1 | 1381 | page->inuse = page->objects; |
8cb0a506 | 1382 | page->frozen = 1; |
81819f0f | 1383 | out: |
81819f0f CL |
1384 | return page; |
1385 | } | |
1386 | ||
1387 | static void __free_slab(struct kmem_cache *s, struct page *page) | |
1388 | { | |
834f3d11 CL |
1389 | int order = compound_order(page); |
1390 | int pages = 1 << order; | |
81819f0f | 1391 | |
af537b0a | 1392 | if (kmem_cache_debug(s)) { |
81819f0f CL |
1393 | void *p; |
1394 | ||
1395 | slab_pad_check(s, page); | |
224a88be CL |
1396 | for_each_object(p, s, page_address(page), |
1397 | page->objects) | |
f7cb1933 | 1398 | check_object(s, page, p, SLUB_RED_INACTIVE); |
81819f0f CL |
1399 | } |
1400 | ||
b1eeab67 | 1401 | kmemcheck_free_shadow(page, compound_order(page)); |
5a896d9e | 1402 | |
81819f0f CL |
1403 | mod_zone_page_state(page_zone(page), |
1404 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? | |
1405 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, | |
06428780 | 1406 | -pages); |
81819f0f | 1407 | |
072bb0aa | 1408 | __ClearPageSlabPfmemalloc(page); |
49bd5221 | 1409 | __ClearPageSlab(page); |
1f458cbf GC |
1410 | |
1411 | memcg_release_pages(s, order); | |
22b751c3 | 1412 | page_mapcount_reset(page); |
1eb5ac64 NP |
1413 | if (current->reclaim_state) |
1414 | current->reclaim_state->reclaimed_slab += pages; | |
d79923fa | 1415 | __free_memcg_kmem_pages(page, order); |
81819f0f CL |
1416 | } |
1417 | ||
da9a638c LJ |
1418 | #define need_reserve_slab_rcu \ |
1419 | (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)) | |
1420 | ||
81819f0f CL |
1421 | static void rcu_free_slab(struct rcu_head *h) |
1422 | { | |
1423 | struct page *page; | |
1424 | ||
da9a638c LJ |
1425 | if (need_reserve_slab_rcu) |
1426 | page = virt_to_head_page(h); | |
1427 | else | |
1428 | page = container_of((struct list_head *)h, struct page, lru); | |
1429 | ||
1b4f59e3 | 1430 | __free_slab(page->slab_cache, page); |
81819f0f CL |
1431 | } |
1432 | ||
1433 | static void free_slab(struct kmem_cache *s, struct page *page) | |
1434 | { | |
1435 | if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) { | |
da9a638c LJ |
1436 | struct rcu_head *head; |
1437 | ||
1438 | if (need_reserve_slab_rcu) { | |
1439 | int order = compound_order(page); | |
1440 | int offset = (PAGE_SIZE << order) - s->reserved; | |
1441 | ||
1442 | VM_BUG_ON(s->reserved != sizeof(*head)); | |
1443 | head = page_address(page) + offset; | |
1444 | } else { | |
1445 | /* | |
1446 | * RCU free overloads the RCU head over the LRU | |
1447 | */ | |
1448 | head = (void *)&page->lru; | |
1449 | } | |
81819f0f CL |
1450 | |
1451 | call_rcu(head, rcu_free_slab); | |
1452 | } else | |
1453 | __free_slab(s, page); | |
1454 | } | |
1455 | ||
1456 | static void discard_slab(struct kmem_cache *s, struct page *page) | |
1457 | { | |
205ab99d | 1458 | dec_slabs_node(s, page_to_nid(page), page->objects); |
81819f0f CL |
1459 | free_slab(s, page); |
1460 | } | |
1461 | ||
1462 | /* | |
5cc6eee8 CL |
1463 | * Management of partially allocated slabs. |
1464 | * | |
1465 | * list_lock must be held. | |
81819f0f | 1466 | */ |
5cc6eee8 | 1467 | static inline void add_partial(struct kmem_cache_node *n, |
7c2e132c | 1468 | struct page *page, int tail) |
81819f0f | 1469 | { |
e95eed57 | 1470 | n->nr_partial++; |
136333d1 | 1471 | if (tail == DEACTIVATE_TO_TAIL) |
7c2e132c CL |
1472 | list_add_tail(&page->lru, &n->partial); |
1473 | else | |
1474 | list_add(&page->lru, &n->partial); | |
81819f0f CL |
1475 | } |
1476 | ||
5cc6eee8 CL |
1477 | /* |
1478 | * list_lock must be held. | |
1479 | */ | |
1480 | static inline void remove_partial(struct kmem_cache_node *n, | |
62e346a8 CL |
1481 | struct page *page) |
1482 | { | |
1483 | list_del(&page->lru); | |
1484 | n->nr_partial--; | |
1485 | } | |
1486 | ||
81819f0f | 1487 | /* |
7ced3719 CL |
1488 | * Remove slab from the partial list, freeze it and |
1489 | * return the pointer to the freelist. | |
81819f0f | 1490 | * |
497b66f2 CL |
1491 | * Returns a list of objects or NULL if it fails. |
1492 | * | |
7ced3719 | 1493 | * Must hold list_lock since we modify the partial list. |
81819f0f | 1494 | */ |
497b66f2 | 1495 | static inline void *acquire_slab(struct kmem_cache *s, |
acd19fd1 | 1496 | struct kmem_cache_node *n, struct page *page, |
633b0764 | 1497 | int mode, int *objects) |
81819f0f | 1498 | { |
2cfb7455 CL |
1499 | void *freelist; |
1500 | unsigned long counters; | |
1501 | struct page new; | |
1502 | ||
2cfb7455 CL |
1503 | /* |
1504 | * Zap the freelist and set the frozen bit. | |
1505 | * The old freelist is the list of objects for the | |
1506 | * per cpu allocation list. | |
1507 | */ | |
7ced3719 CL |
1508 | freelist = page->freelist; |
1509 | counters = page->counters; | |
1510 | new.counters = counters; | |
633b0764 | 1511 | *objects = new.objects - new.inuse; |
23910c50 | 1512 | if (mode) { |
7ced3719 | 1513 | new.inuse = page->objects; |
23910c50 PE |
1514 | new.freelist = NULL; |
1515 | } else { | |
1516 | new.freelist = freelist; | |
1517 | } | |
2cfb7455 | 1518 | |
7ced3719 CL |
1519 | VM_BUG_ON(new.frozen); |
1520 | new.frozen = 1; | |
2cfb7455 | 1521 | |
7ced3719 | 1522 | if (!__cmpxchg_double_slab(s, page, |
2cfb7455 | 1523 | freelist, counters, |
02d7633f | 1524 | new.freelist, new.counters, |
7ced3719 | 1525 | "acquire_slab")) |
7ced3719 | 1526 | return NULL; |
2cfb7455 CL |
1527 | |
1528 | remove_partial(n, page); | |
7ced3719 | 1529 | WARN_ON(!freelist); |
49e22585 | 1530 | return freelist; |
81819f0f CL |
1531 | } |
1532 | ||
633b0764 | 1533 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain); |
8ba00bb6 | 1534 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags); |
49e22585 | 1535 | |
81819f0f | 1536 | /* |
672bba3a | 1537 | * Try to allocate a partial slab from a specific node. |
81819f0f | 1538 | */ |
8ba00bb6 JK |
1539 | static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, |
1540 | struct kmem_cache_cpu *c, gfp_t flags) | |
81819f0f | 1541 | { |
49e22585 CL |
1542 | struct page *page, *page2; |
1543 | void *object = NULL; | |
633b0764 JK |
1544 | int available = 0; |
1545 | int objects; | |
81819f0f CL |
1546 | |
1547 | /* | |
1548 | * Racy check. If we mistakenly see no partial slabs then we | |
1549 | * just allocate an empty slab. If we mistakenly try to get a | |
672bba3a CL |
1550 | * partial slab and there is none available then get_partials() |
1551 | * will return NULL. | |
81819f0f CL |
1552 | */ |
1553 | if (!n || !n->nr_partial) | |
1554 | return NULL; | |
1555 | ||
1556 | spin_lock(&n->list_lock); | |
49e22585 | 1557 | list_for_each_entry_safe(page, page2, &n->partial, lru) { |
8ba00bb6 | 1558 | void *t; |
49e22585 | 1559 | |
8ba00bb6 JK |
1560 | if (!pfmemalloc_match(page, flags)) |
1561 | continue; | |
1562 | ||
633b0764 | 1563 | t = acquire_slab(s, n, page, object == NULL, &objects); |
49e22585 CL |
1564 | if (!t) |
1565 | break; | |
1566 | ||
633b0764 | 1567 | available += objects; |
12d79634 | 1568 | if (!object) { |
49e22585 | 1569 | c->page = page; |
49e22585 | 1570 | stat(s, ALLOC_FROM_PARTIAL); |
49e22585 | 1571 | object = t; |
49e22585 | 1572 | } else { |
633b0764 | 1573 | put_cpu_partial(s, page, 0); |
8028dcea | 1574 | stat(s, CPU_PARTIAL_NODE); |
49e22585 CL |
1575 | } |
1576 | if (kmem_cache_debug(s) || available > s->cpu_partial / 2) | |
1577 | break; | |
1578 | ||
497b66f2 | 1579 | } |
81819f0f | 1580 | spin_unlock(&n->list_lock); |
497b66f2 | 1581 | return object; |
81819f0f CL |
1582 | } |
1583 | ||
1584 | /* | |
672bba3a | 1585 | * Get a page from somewhere. Search in increasing NUMA distances. |
81819f0f | 1586 | */ |
de3ec035 | 1587 | static void *get_any_partial(struct kmem_cache *s, gfp_t flags, |
acd19fd1 | 1588 | struct kmem_cache_cpu *c) |
81819f0f CL |
1589 | { |
1590 | #ifdef CONFIG_NUMA | |
1591 | struct zonelist *zonelist; | |
dd1a239f | 1592 | struct zoneref *z; |
54a6eb5c MG |
1593 | struct zone *zone; |
1594 | enum zone_type high_zoneidx = gfp_zone(flags); | |
497b66f2 | 1595 | void *object; |
cc9a6c87 | 1596 | unsigned int cpuset_mems_cookie; |
81819f0f CL |
1597 | |
1598 | /* | |
672bba3a CL |
1599 | * The defrag ratio allows a configuration of the tradeoffs between |
1600 | * inter node defragmentation and node local allocations. A lower | |
1601 | * defrag_ratio increases the tendency to do local allocations | |
1602 | * instead of attempting to obtain partial slabs from other nodes. | |
81819f0f | 1603 | * |
672bba3a CL |
1604 | * If the defrag_ratio is set to 0 then kmalloc() always |
1605 | * returns node local objects. If the ratio is higher then kmalloc() | |
1606 | * may return off node objects because partial slabs are obtained | |
1607 | * from other nodes and filled up. | |
81819f0f | 1608 | * |
6446faa2 | 1609 | * If /sys/kernel/slab/xx/defrag_ratio is set to 100 (which makes |
672bba3a CL |
1610 | * defrag_ratio = 1000) then every (well almost) allocation will |
1611 | * first attempt to defrag slab caches on other nodes. This means | |
1612 | * scanning over all nodes to look for partial slabs which may be | |
1613 | * expensive if we do it every time we are trying to find a slab | |
1614 | * with available objects. | |
81819f0f | 1615 | */ |
9824601e CL |
1616 | if (!s->remote_node_defrag_ratio || |
1617 | get_cycles() % 1024 > s->remote_node_defrag_ratio) | |
81819f0f CL |
1618 | return NULL; |
1619 | ||
cc9a6c87 MG |
1620 | do { |
1621 | cpuset_mems_cookie = get_mems_allowed(); | |
e7b691b0 | 1622 | zonelist = node_zonelist(slab_node(), flags); |
cc9a6c87 MG |
1623 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
1624 | struct kmem_cache_node *n; | |
1625 | ||
1626 | n = get_node(s, zone_to_nid(zone)); | |
1627 | ||
1628 | if (n && cpuset_zone_allowed_hardwall(zone, flags) && | |
1629 | n->nr_partial > s->min_partial) { | |
8ba00bb6 | 1630 | object = get_partial_node(s, n, c, flags); |
cc9a6c87 MG |
1631 | if (object) { |
1632 | /* | |
1633 | * Return the object even if | |
1634 | * put_mems_allowed indicated that | |
1635 | * the cpuset mems_allowed was | |
1636 | * updated in parallel. It's a | |
1637 | * harmless race between the alloc | |
1638 | * and the cpuset update. | |
1639 | */ | |
1640 | put_mems_allowed(cpuset_mems_cookie); | |
1641 | return object; | |
1642 | } | |
c0ff7453 | 1643 | } |
81819f0f | 1644 | } |
cc9a6c87 | 1645 | } while (!put_mems_allowed(cpuset_mems_cookie)); |
81819f0f CL |
1646 | #endif |
1647 | return NULL; | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * Get a partial page, lock it and return it. | |
1652 | */ | |
497b66f2 | 1653 | static void *get_partial(struct kmem_cache *s, gfp_t flags, int node, |
acd19fd1 | 1654 | struct kmem_cache_cpu *c) |
81819f0f | 1655 | { |
497b66f2 | 1656 | void *object; |
2154a336 | 1657 | int searchnode = (node == NUMA_NO_NODE) ? numa_node_id() : node; |
81819f0f | 1658 | |
8ba00bb6 | 1659 | object = get_partial_node(s, get_node(s, searchnode), c, flags); |
497b66f2 CL |
1660 | if (object || node != NUMA_NO_NODE) |
1661 | return object; | |
81819f0f | 1662 | |
acd19fd1 | 1663 | return get_any_partial(s, flags, c); |
81819f0f CL |
1664 | } |
1665 | ||
8a5ec0ba CL |
1666 | #ifdef CONFIG_PREEMPT |
1667 | /* | |
1668 | * Calculate the next globally unique transaction for disambiguiation | |
1669 | * during cmpxchg. The transactions start with the cpu number and are then | |
1670 | * incremented by CONFIG_NR_CPUS. | |
1671 | */ | |
1672 | #define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS) | |
1673 | #else | |
1674 | /* | |
1675 | * No preemption supported therefore also no need to check for | |
1676 | * different cpus. | |
1677 | */ | |
1678 | #define TID_STEP 1 | |
1679 | #endif | |
1680 | ||
1681 | static inline unsigned long next_tid(unsigned long tid) | |
1682 | { | |
1683 | return tid + TID_STEP; | |
1684 | } | |
1685 | ||
1686 | static inline unsigned int tid_to_cpu(unsigned long tid) | |
1687 | { | |
1688 | return tid % TID_STEP; | |
1689 | } | |
1690 | ||
1691 | static inline unsigned long tid_to_event(unsigned long tid) | |
1692 | { | |
1693 | return tid / TID_STEP; | |
1694 | } | |
1695 | ||
1696 | static inline unsigned int init_tid(int cpu) | |
1697 | { | |
1698 | return cpu; | |
1699 | } | |
1700 | ||
1701 | static inline void note_cmpxchg_failure(const char *n, | |
1702 | const struct kmem_cache *s, unsigned long tid) | |
1703 | { | |
1704 | #ifdef SLUB_DEBUG_CMPXCHG | |
1705 | unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid); | |
1706 | ||
1707 | printk(KERN_INFO "%s %s: cmpxchg redo ", n, s->name); | |
1708 | ||
1709 | #ifdef CONFIG_PREEMPT | |
1710 | if (tid_to_cpu(tid) != tid_to_cpu(actual_tid)) | |
1711 | printk("due to cpu change %d -> %d\n", | |
1712 | tid_to_cpu(tid), tid_to_cpu(actual_tid)); | |
1713 | else | |
1714 | #endif | |
1715 | if (tid_to_event(tid) != tid_to_event(actual_tid)) | |
1716 | printk("due to cpu running other code. Event %ld->%ld\n", | |
1717 | tid_to_event(tid), tid_to_event(actual_tid)); | |
1718 | else | |
1719 | printk("for unknown reason: actual=%lx was=%lx target=%lx\n", | |
1720 | actual_tid, tid, next_tid(tid)); | |
1721 | #endif | |
4fdccdfb | 1722 | stat(s, CMPXCHG_DOUBLE_CPU_FAIL); |
8a5ec0ba CL |
1723 | } |
1724 | ||
788e1aad | 1725 | static void init_kmem_cache_cpus(struct kmem_cache *s) |
8a5ec0ba | 1726 | { |
8a5ec0ba CL |
1727 | int cpu; |
1728 | ||
1729 | for_each_possible_cpu(cpu) | |
1730 | per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu); | |
8a5ec0ba | 1731 | } |
2cfb7455 | 1732 | |
81819f0f CL |
1733 | /* |
1734 | * Remove the cpu slab | |
1735 | */ | |
c17dda40 | 1736 | static void deactivate_slab(struct kmem_cache *s, struct page *page, void *freelist) |
81819f0f | 1737 | { |
2cfb7455 | 1738 | enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; |
2cfb7455 CL |
1739 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
1740 | int lock = 0; | |
1741 | enum slab_modes l = M_NONE, m = M_NONE; | |
2cfb7455 | 1742 | void *nextfree; |
136333d1 | 1743 | int tail = DEACTIVATE_TO_HEAD; |
2cfb7455 CL |
1744 | struct page new; |
1745 | struct page old; | |
1746 | ||
1747 | if (page->freelist) { | |
84e554e6 | 1748 | stat(s, DEACTIVATE_REMOTE_FREES); |
136333d1 | 1749 | tail = DEACTIVATE_TO_TAIL; |
2cfb7455 CL |
1750 | } |
1751 | ||
894b8788 | 1752 | /* |
2cfb7455 CL |
1753 | * Stage one: Free all available per cpu objects back |
1754 | * to the page freelist while it is still frozen. Leave the | |
1755 | * last one. | |
1756 | * | |
1757 | * There is no need to take the list->lock because the page | |
1758 | * is still frozen. | |
1759 | */ | |
1760 | while (freelist && (nextfree = get_freepointer(s, freelist))) { | |
1761 | void *prior; | |
1762 | unsigned long counters; | |
1763 | ||
1764 | do { | |
1765 | prior = page->freelist; | |
1766 | counters = page->counters; | |
1767 | set_freepointer(s, freelist, prior); | |
1768 | new.counters = counters; | |
1769 | new.inuse--; | |
1770 | VM_BUG_ON(!new.frozen); | |
1771 | ||
1d07171c | 1772 | } while (!__cmpxchg_double_slab(s, page, |
2cfb7455 CL |
1773 | prior, counters, |
1774 | freelist, new.counters, | |
1775 | "drain percpu freelist")); | |
1776 | ||
1777 | freelist = nextfree; | |
1778 | } | |
1779 | ||
894b8788 | 1780 | /* |
2cfb7455 CL |
1781 | * Stage two: Ensure that the page is unfrozen while the |
1782 | * list presence reflects the actual number of objects | |
1783 | * during unfreeze. | |
1784 | * | |
1785 | * We setup the list membership and then perform a cmpxchg | |
1786 | * with the count. If there is a mismatch then the page | |
1787 | * is not unfrozen but the page is on the wrong list. | |
1788 | * | |
1789 | * Then we restart the process which may have to remove | |
1790 | * the page from the list that we just put it on again | |
1791 | * because the number of objects in the slab may have | |
1792 | * changed. | |
894b8788 | 1793 | */ |
2cfb7455 | 1794 | redo: |
894b8788 | 1795 | |
2cfb7455 CL |
1796 | old.freelist = page->freelist; |
1797 | old.counters = page->counters; | |
1798 | VM_BUG_ON(!old.frozen); | |
7c2e132c | 1799 | |
2cfb7455 CL |
1800 | /* Determine target state of the slab */ |
1801 | new.counters = old.counters; | |
1802 | if (freelist) { | |
1803 | new.inuse--; | |
1804 | set_freepointer(s, freelist, old.freelist); | |
1805 | new.freelist = freelist; | |
1806 | } else | |
1807 | new.freelist = old.freelist; | |
1808 | ||
1809 | new.frozen = 0; | |
1810 | ||
81107188 | 1811 | if (!new.inuse && n->nr_partial > s->min_partial) |
2cfb7455 CL |
1812 | m = M_FREE; |
1813 | else if (new.freelist) { | |
1814 | m = M_PARTIAL; | |
1815 | if (!lock) { | |
1816 | lock = 1; | |
1817 | /* | |
1818 | * Taking the spinlock removes the possiblity | |
1819 | * that acquire_slab() will see a slab page that | |
1820 | * is frozen | |
1821 | */ | |
1822 | spin_lock(&n->list_lock); | |
1823 | } | |
1824 | } else { | |
1825 | m = M_FULL; | |
1826 | if (kmem_cache_debug(s) && !lock) { | |
1827 | lock = 1; | |
1828 | /* | |
1829 | * This also ensures that the scanning of full | |
1830 | * slabs from diagnostic functions will not see | |
1831 | * any frozen slabs. | |
1832 | */ | |
1833 | spin_lock(&n->list_lock); | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | if (l != m) { | |
1838 | ||
1839 | if (l == M_PARTIAL) | |
1840 | ||
1841 | remove_partial(n, page); | |
1842 | ||
1843 | else if (l == M_FULL) | |
894b8788 | 1844 | |
2cfb7455 CL |
1845 | remove_full(s, page); |
1846 | ||
1847 | if (m == M_PARTIAL) { | |
1848 | ||
1849 | add_partial(n, page, tail); | |
136333d1 | 1850 | stat(s, tail); |
2cfb7455 CL |
1851 | |
1852 | } else if (m == M_FULL) { | |
894b8788 | 1853 | |
2cfb7455 CL |
1854 | stat(s, DEACTIVATE_FULL); |
1855 | add_full(s, n, page); | |
1856 | ||
1857 | } | |
1858 | } | |
1859 | ||
1860 | l = m; | |
1d07171c | 1861 | if (!__cmpxchg_double_slab(s, page, |
2cfb7455 CL |
1862 | old.freelist, old.counters, |
1863 | new.freelist, new.counters, | |
1864 | "unfreezing slab")) | |
1865 | goto redo; | |
1866 | ||
2cfb7455 CL |
1867 | if (lock) |
1868 | spin_unlock(&n->list_lock); | |
1869 | ||
1870 | if (m == M_FREE) { | |
1871 | stat(s, DEACTIVATE_EMPTY); | |
1872 | discard_slab(s, page); | |
1873 | stat(s, FREE_SLAB); | |
894b8788 | 1874 | } |
81819f0f CL |
1875 | } |
1876 | ||
d24ac77f JK |
1877 | /* |
1878 | * Unfreeze all the cpu partial slabs. | |
1879 | * | |
59a09917 CL |
1880 | * This function must be called with interrupts disabled |
1881 | * for the cpu using c (or some other guarantee must be there | |
1882 | * to guarantee no concurrent accesses). | |
d24ac77f | 1883 | */ |
59a09917 CL |
1884 | static void unfreeze_partials(struct kmem_cache *s, |
1885 | struct kmem_cache_cpu *c) | |
49e22585 | 1886 | { |
43d77867 | 1887 | struct kmem_cache_node *n = NULL, *n2 = NULL; |
9ada1934 | 1888 | struct page *page, *discard_page = NULL; |
49e22585 CL |
1889 | |
1890 | while ((page = c->partial)) { | |
49e22585 CL |
1891 | struct page new; |
1892 | struct page old; | |
1893 | ||
1894 | c->partial = page->next; | |
43d77867 JK |
1895 | |
1896 | n2 = get_node(s, page_to_nid(page)); | |
1897 | if (n != n2) { | |
1898 | if (n) | |
1899 | spin_unlock(&n->list_lock); | |
1900 | ||
1901 | n = n2; | |
1902 | spin_lock(&n->list_lock); | |
1903 | } | |
49e22585 CL |
1904 | |
1905 | do { | |
1906 | ||
1907 | old.freelist = page->freelist; | |
1908 | old.counters = page->counters; | |
1909 | VM_BUG_ON(!old.frozen); | |
1910 | ||
1911 | new.counters = old.counters; | |
1912 | new.freelist = old.freelist; | |
1913 | ||
1914 | new.frozen = 0; | |
1915 | ||
d24ac77f | 1916 | } while (!__cmpxchg_double_slab(s, page, |
49e22585 CL |
1917 | old.freelist, old.counters, |
1918 | new.freelist, new.counters, | |
1919 | "unfreezing slab")); | |
1920 | ||
43d77867 | 1921 | if (unlikely(!new.inuse && n->nr_partial > s->min_partial)) { |
9ada1934 SL |
1922 | page->next = discard_page; |
1923 | discard_page = page; | |
43d77867 JK |
1924 | } else { |
1925 | add_partial(n, page, DEACTIVATE_TO_TAIL); | |
1926 | stat(s, FREE_ADD_PARTIAL); | |
49e22585 CL |
1927 | } |
1928 | } | |
1929 | ||
1930 | if (n) | |
1931 | spin_unlock(&n->list_lock); | |
9ada1934 SL |
1932 | |
1933 | while (discard_page) { | |
1934 | page = discard_page; | |
1935 | discard_page = discard_page->next; | |
1936 | ||
1937 | stat(s, DEACTIVATE_EMPTY); | |
1938 | discard_slab(s, page); | |
1939 | stat(s, FREE_SLAB); | |
1940 | } | |
49e22585 CL |
1941 | } |
1942 | ||
1943 | /* | |
1944 | * Put a page that was just frozen (in __slab_free) into a partial page | |
1945 | * slot if available. This is done without interrupts disabled and without | |
1946 | * preemption disabled. The cmpxchg is racy and may put the partial page | |
1947 | * onto a random cpus partial slot. | |
1948 | * | |
1949 | * If we did not find a slot then simply move all the partials to the | |
1950 | * per node partial list. | |
1951 | */ | |
633b0764 | 1952 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) |
49e22585 CL |
1953 | { |
1954 | struct page *oldpage; | |
1955 | int pages; | |
1956 | int pobjects; | |
1957 | ||
1958 | do { | |
1959 | pages = 0; | |
1960 | pobjects = 0; | |
1961 | oldpage = this_cpu_read(s->cpu_slab->partial); | |
1962 | ||
1963 | if (oldpage) { | |
1964 | pobjects = oldpage->pobjects; | |
1965 | pages = oldpage->pages; | |
1966 | if (drain && pobjects > s->cpu_partial) { | |
1967 | unsigned long flags; | |
1968 | /* | |
1969 | * partial array is full. Move the existing | |
1970 | * set to the per node partial list. | |
1971 | */ | |
1972 | local_irq_save(flags); | |
59a09917 | 1973 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); |
49e22585 | 1974 | local_irq_restore(flags); |
e24fc410 | 1975 | oldpage = NULL; |
49e22585 CL |
1976 | pobjects = 0; |
1977 | pages = 0; | |
8028dcea | 1978 | stat(s, CPU_PARTIAL_DRAIN); |
49e22585 CL |
1979 | } |
1980 | } | |
1981 | ||
1982 | pages++; | |
1983 | pobjects += page->objects - page->inuse; | |
1984 | ||
1985 | page->pages = pages; | |
1986 | page->pobjects = pobjects; | |
1987 | page->next = oldpage; | |
1988 | ||
933393f5 | 1989 | } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage); |
49e22585 CL |
1990 | } |
1991 | ||
dfb4f096 | 1992 | static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) |
81819f0f | 1993 | { |
84e554e6 | 1994 | stat(s, CPUSLAB_FLUSH); |
c17dda40 CL |
1995 | deactivate_slab(s, c->page, c->freelist); |
1996 | ||
1997 | c->tid = next_tid(c->tid); | |
1998 | c->page = NULL; | |
1999 | c->freelist = NULL; | |
81819f0f CL |
2000 | } |
2001 | ||
2002 | /* | |
2003 | * Flush cpu slab. | |
6446faa2 | 2004 | * |
81819f0f CL |
2005 | * Called from IPI handler with interrupts disabled. |
2006 | */ | |
0c710013 | 2007 | static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) |
81819f0f | 2008 | { |
9dfc6e68 | 2009 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
81819f0f | 2010 | |
49e22585 CL |
2011 | if (likely(c)) { |
2012 | if (c->page) | |
2013 | flush_slab(s, c); | |
2014 | ||
59a09917 | 2015 | unfreeze_partials(s, c); |
49e22585 | 2016 | } |
81819f0f CL |
2017 | } |
2018 | ||
2019 | static void flush_cpu_slab(void *d) | |
2020 | { | |
2021 | struct kmem_cache *s = d; | |
81819f0f | 2022 | |
dfb4f096 | 2023 | __flush_cpu_slab(s, smp_processor_id()); |
81819f0f CL |
2024 | } |
2025 | ||
a8364d55 GBY |
2026 | static bool has_cpu_slab(int cpu, void *info) |
2027 | { | |
2028 | struct kmem_cache *s = info; | |
2029 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); | |
2030 | ||
02e1a9cd | 2031 | return c->page || c->partial; |
a8364d55 GBY |
2032 | } |
2033 | ||
81819f0f CL |
2034 | static void flush_all(struct kmem_cache *s) |
2035 | { | |
a8364d55 | 2036 | on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC); |
81819f0f CL |
2037 | } |
2038 | ||
dfb4f096 CL |
2039 | /* |
2040 | * Check if the objects in a per cpu structure fit numa | |
2041 | * locality expectations. | |
2042 | */ | |
57d437d2 | 2043 | static inline int node_match(struct page *page, int node) |
dfb4f096 CL |
2044 | { |
2045 | #ifdef CONFIG_NUMA | |
4d7868e6 | 2046 | if (!page || (node != NUMA_NO_NODE && page_to_nid(page) != node)) |
dfb4f096 CL |
2047 | return 0; |
2048 | #endif | |
2049 | return 1; | |
2050 | } | |
2051 | ||
781b2ba6 PE |
2052 | static int count_free(struct page *page) |
2053 | { | |
2054 | return page->objects - page->inuse; | |
2055 | } | |
2056 | ||
2057 | static unsigned long count_partial(struct kmem_cache_node *n, | |
2058 | int (*get_count)(struct page *)) | |
2059 | { | |
2060 | unsigned long flags; | |
2061 | unsigned long x = 0; | |
2062 | struct page *page; | |
2063 | ||
2064 | spin_lock_irqsave(&n->list_lock, flags); | |
2065 | list_for_each_entry(page, &n->partial, lru) | |
2066 | x += get_count(page); | |
2067 | spin_unlock_irqrestore(&n->list_lock, flags); | |
2068 | return x; | |
2069 | } | |
2070 | ||
26c02cf0 AB |
2071 | static inline unsigned long node_nr_objs(struct kmem_cache_node *n) |
2072 | { | |
2073 | #ifdef CONFIG_SLUB_DEBUG | |
2074 | return atomic_long_read(&n->total_objects); | |
2075 | #else | |
2076 | return 0; | |
2077 | #endif | |
2078 | } | |
2079 | ||
781b2ba6 PE |
2080 | static noinline void |
2081 | slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid) | |
2082 | { | |
2083 | int node; | |
2084 | ||
2085 | printk(KERN_WARNING | |
2086 | "SLUB: Unable to allocate memory on node %d (gfp=0x%x)\n", | |
2087 | nid, gfpflags); | |
2088 | printk(KERN_WARNING " cache: %s, object size: %d, buffer size: %d, " | |
3b0efdfa | 2089 | "default order: %d, min order: %d\n", s->name, s->object_size, |
781b2ba6 PE |
2090 | s->size, oo_order(s->oo), oo_order(s->min)); |
2091 | ||
3b0efdfa | 2092 | if (oo_order(s->min) > get_order(s->object_size)) |
fa5ec8a1 DR |
2093 | printk(KERN_WARNING " %s debugging increased min order, use " |
2094 | "slub_debug=O to disable.\n", s->name); | |
2095 | ||
781b2ba6 PE |
2096 | for_each_online_node(node) { |
2097 | struct kmem_cache_node *n = get_node(s, node); | |
2098 | unsigned long nr_slabs; | |
2099 | unsigned long nr_objs; | |
2100 | unsigned long nr_free; | |
2101 | ||
2102 | if (!n) | |
2103 | continue; | |
2104 | ||
26c02cf0 AB |
2105 | nr_free = count_partial(n, count_free); |
2106 | nr_slabs = node_nr_slabs(n); | |
2107 | nr_objs = node_nr_objs(n); | |
781b2ba6 PE |
2108 | |
2109 | printk(KERN_WARNING | |
2110 | " node %d: slabs: %ld, objs: %ld, free: %ld\n", | |
2111 | node, nr_slabs, nr_objs, nr_free); | |
2112 | } | |
2113 | } | |
2114 | ||
497b66f2 CL |
2115 | static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags, |
2116 | int node, struct kmem_cache_cpu **pc) | |
2117 | { | |
6faa6833 | 2118 | void *freelist; |
188fd063 CL |
2119 | struct kmem_cache_cpu *c = *pc; |
2120 | struct page *page; | |
497b66f2 | 2121 | |
188fd063 | 2122 | freelist = get_partial(s, flags, node, c); |
497b66f2 | 2123 | |
188fd063 CL |
2124 | if (freelist) |
2125 | return freelist; | |
2126 | ||
2127 | page = new_slab(s, flags, node); | |
497b66f2 CL |
2128 | if (page) { |
2129 | c = __this_cpu_ptr(s->cpu_slab); | |
2130 | if (c->page) | |
2131 | flush_slab(s, c); | |
2132 | ||
2133 | /* | |
2134 | * No other reference to the page yet so we can | |
2135 | * muck around with it freely without cmpxchg | |
2136 | */ | |
6faa6833 | 2137 | freelist = page->freelist; |
497b66f2 CL |
2138 | page->freelist = NULL; |
2139 | ||
2140 | stat(s, ALLOC_SLAB); | |
497b66f2 CL |
2141 | c->page = page; |
2142 | *pc = c; | |
2143 | } else | |
6faa6833 | 2144 | freelist = NULL; |
497b66f2 | 2145 | |
6faa6833 | 2146 | return freelist; |
497b66f2 CL |
2147 | } |
2148 | ||
072bb0aa MG |
2149 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags) |
2150 | { | |
2151 | if (unlikely(PageSlabPfmemalloc(page))) | |
2152 | return gfp_pfmemalloc_allowed(gfpflags); | |
2153 | ||
2154 | return true; | |
2155 | } | |
2156 | ||
213eeb9f CL |
2157 | /* |
2158 | * Check the page->freelist of a page and either transfer the freelist to the per cpu freelist | |
2159 | * or deactivate the page. | |
2160 | * | |
2161 | * The page is still frozen if the return value is not NULL. | |
2162 | * | |
2163 | * If this function returns NULL then the page has been unfrozen. | |
d24ac77f JK |
2164 | * |
2165 | * This function must be called with interrupt disabled. | |
213eeb9f CL |
2166 | */ |
2167 | static inline void *get_freelist(struct kmem_cache *s, struct page *page) | |
2168 | { | |
2169 | struct page new; | |
2170 | unsigned long counters; | |
2171 | void *freelist; | |
2172 | ||
2173 | do { | |
2174 | freelist = page->freelist; | |
2175 | counters = page->counters; | |
6faa6833 | 2176 | |
213eeb9f CL |
2177 | new.counters = counters; |
2178 | VM_BUG_ON(!new.frozen); | |
2179 | ||
2180 | new.inuse = page->objects; | |
2181 | new.frozen = freelist != NULL; | |
2182 | ||
d24ac77f | 2183 | } while (!__cmpxchg_double_slab(s, page, |
213eeb9f CL |
2184 | freelist, counters, |
2185 | NULL, new.counters, | |
2186 | "get_freelist")); | |
2187 | ||
2188 | return freelist; | |
2189 | } | |
2190 | ||
81819f0f | 2191 | /* |
894b8788 CL |
2192 | * Slow path. The lockless freelist is empty or we need to perform |
2193 | * debugging duties. | |
2194 | * | |
894b8788 CL |
2195 | * Processing is still very fast if new objects have been freed to the |
2196 | * regular freelist. In that case we simply take over the regular freelist | |
2197 | * as the lockless freelist and zap the regular freelist. | |
81819f0f | 2198 | * |
894b8788 CL |
2199 | * If that is not working then we fall back to the partial lists. We take the |
2200 | * first element of the freelist as the object to allocate now and move the | |
2201 | * rest of the freelist to the lockless freelist. | |
81819f0f | 2202 | * |
894b8788 | 2203 | * And if we were unable to get a new slab from the partial slab lists then |
6446faa2 CL |
2204 | * we need to allocate a new slab. This is the slowest path since it involves |
2205 | * a call to the page allocator and the setup of a new slab. | |
81819f0f | 2206 | */ |
ce71e27c EGM |
2207 | static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
2208 | unsigned long addr, struct kmem_cache_cpu *c) | |
81819f0f | 2209 | { |
6faa6833 | 2210 | void *freelist; |
f6e7def7 | 2211 | struct page *page; |
8a5ec0ba CL |
2212 | unsigned long flags; |
2213 | ||
2214 | local_irq_save(flags); | |
2215 | #ifdef CONFIG_PREEMPT | |
2216 | /* | |
2217 | * We may have been preempted and rescheduled on a different | |
2218 | * cpu before disabling interrupts. Need to reload cpu area | |
2219 | * pointer. | |
2220 | */ | |
2221 | c = this_cpu_ptr(s->cpu_slab); | |
8a5ec0ba | 2222 | #endif |
81819f0f | 2223 | |
f6e7def7 CL |
2224 | page = c->page; |
2225 | if (!page) | |
81819f0f | 2226 | goto new_slab; |
49e22585 | 2227 | redo: |
6faa6833 | 2228 | |
57d437d2 | 2229 | if (unlikely(!node_match(page, node))) { |
e36a2652 | 2230 | stat(s, ALLOC_NODE_MISMATCH); |
f6e7def7 | 2231 | deactivate_slab(s, page, c->freelist); |
c17dda40 CL |
2232 | c->page = NULL; |
2233 | c->freelist = NULL; | |
fc59c053 CL |
2234 | goto new_slab; |
2235 | } | |
6446faa2 | 2236 | |
072bb0aa MG |
2237 | /* |
2238 | * By rights, we should be searching for a slab page that was | |
2239 | * PFMEMALLOC but right now, we are losing the pfmemalloc | |
2240 | * information when the page leaves the per-cpu allocator | |
2241 | */ | |
2242 | if (unlikely(!pfmemalloc_match(page, gfpflags))) { | |
2243 | deactivate_slab(s, page, c->freelist); | |
2244 | c->page = NULL; | |
2245 | c->freelist = NULL; | |
2246 | goto new_slab; | |
2247 | } | |
2248 | ||
73736e03 | 2249 | /* must check again c->freelist in case of cpu migration or IRQ */ |
6faa6833 CL |
2250 | freelist = c->freelist; |
2251 | if (freelist) | |
73736e03 | 2252 | goto load_freelist; |
03e404af | 2253 | |
2cfb7455 | 2254 | stat(s, ALLOC_SLOWPATH); |
03e404af | 2255 | |
f6e7def7 | 2256 | freelist = get_freelist(s, page); |
6446faa2 | 2257 | |
6faa6833 | 2258 | if (!freelist) { |
03e404af CL |
2259 | c->page = NULL; |
2260 | stat(s, DEACTIVATE_BYPASS); | |
fc59c053 | 2261 | goto new_slab; |
03e404af | 2262 | } |
6446faa2 | 2263 | |
84e554e6 | 2264 | stat(s, ALLOC_REFILL); |
6446faa2 | 2265 | |
894b8788 | 2266 | load_freelist: |
507effea CL |
2267 | /* |
2268 | * freelist is pointing to the list of objects to be used. | |
2269 | * page is pointing to the page from which the objects are obtained. | |
2270 | * That page must be frozen for per cpu allocations to work. | |
2271 | */ | |
2272 | VM_BUG_ON(!c->page->frozen); | |
6faa6833 | 2273 | c->freelist = get_freepointer(s, freelist); |
8a5ec0ba CL |
2274 | c->tid = next_tid(c->tid); |
2275 | local_irq_restore(flags); | |
6faa6833 | 2276 | return freelist; |
81819f0f | 2277 | |
81819f0f | 2278 | new_slab: |
2cfb7455 | 2279 | |
49e22585 | 2280 | if (c->partial) { |
f6e7def7 CL |
2281 | page = c->page = c->partial; |
2282 | c->partial = page->next; | |
49e22585 CL |
2283 | stat(s, CPU_PARTIAL_ALLOC); |
2284 | c->freelist = NULL; | |
2285 | goto redo; | |
81819f0f CL |
2286 | } |
2287 | ||
188fd063 | 2288 | freelist = new_slab_objects(s, gfpflags, node, &c); |
01ad8a7b | 2289 | |
f4697436 CL |
2290 | if (unlikely(!freelist)) { |
2291 | if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit()) | |
2292 | slab_out_of_memory(s, gfpflags, node); | |
2cfb7455 | 2293 | |
f4697436 CL |
2294 | local_irq_restore(flags); |
2295 | return NULL; | |
81819f0f | 2296 | } |
2cfb7455 | 2297 | |
f6e7def7 | 2298 | page = c->page; |
5091b74a | 2299 | if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) |
4b6f0750 | 2300 | goto load_freelist; |
2cfb7455 | 2301 | |
497b66f2 | 2302 | /* Only entered in the debug case */ |
5091b74a | 2303 | if (kmem_cache_debug(s) && !alloc_debug_processing(s, page, freelist, addr)) |
497b66f2 | 2304 | goto new_slab; /* Slab failed checks. Next slab needed */ |
894b8788 | 2305 | |
f6e7def7 | 2306 | deactivate_slab(s, page, get_freepointer(s, freelist)); |
c17dda40 CL |
2307 | c->page = NULL; |
2308 | c->freelist = NULL; | |
a71ae47a | 2309 | local_irq_restore(flags); |
6faa6833 | 2310 | return freelist; |
894b8788 CL |
2311 | } |
2312 | ||
2313 | /* | |
2314 | * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc) | |
2315 | * have the fastpath folded into their functions. So no function call | |
2316 | * overhead for requests that can be satisfied on the fastpath. | |
2317 | * | |
2318 | * The fastpath works by first checking if the lockless freelist can be used. | |
2319 | * If not then __slab_alloc is called for slow processing. | |
2320 | * | |
2321 | * Otherwise we can simply pick the next object from the lockless free list. | |
2322 | */ | |
2b847c3c | 2323 | static __always_inline void *slab_alloc_node(struct kmem_cache *s, |
ce71e27c | 2324 | gfp_t gfpflags, int node, unsigned long addr) |
894b8788 | 2325 | { |
894b8788 | 2326 | void **object; |
dfb4f096 | 2327 | struct kmem_cache_cpu *c; |
57d437d2 | 2328 | struct page *page; |
8a5ec0ba | 2329 | unsigned long tid; |
1f84260c | 2330 | |
c016b0bd | 2331 | if (slab_pre_alloc_hook(s, gfpflags)) |
773ff60e | 2332 | return NULL; |
1f84260c | 2333 | |
d79923fa | 2334 | s = memcg_kmem_get_cache(s, gfpflags); |
8a5ec0ba | 2335 | redo: |
8a5ec0ba CL |
2336 | /* |
2337 | * Must read kmem_cache cpu data via this cpu ptr. Preemption is | |
2338 | * enabled. We may switch back and forth between cpus while | |
2339 | * reading from one cpu area. That does not matter as long | |
2340 | * as we end up on the original cpu again when doing the cmpxchg. | |
7cccd80b CL |
2341 | * |
2342 | * Preemption is disabled for the retrieval of the tid because that | |
2343 | * must occur from the current processor. We cannot allow rescheduling | |
2344 | * on a different processor between the determination of the pointer | |
2345 | * and the retrieval of the tid. | |
8a5ec0ba | 2346 | */ |
7cccd80b | 2347 | preempt_disable(); |
9dfc6e68 | 2348 | c = __this_cpu_ptr(s->cpu_slab); |
8a5ec0ba | 2349 | |
8a5ec0ba CL |
2350 | /* |
2351 | * The transaction ids are globally unique per cpu and per operation on | |
2352 | * a per cpu queue. Thus they can be guarantee that the cmpxchg_double | |
2353 | * occurs on the right processor and that there was no operation on the | |
2354 | * linked list in between. | |
2355 | */ | |
2356 | tid = c->tid; | |
7cccd80b | 2357 | preempt_enable(); |
8a5ec0ba | 2358 | |
9dfc6e68 | 2359 | object = c->freelist; |
57d437d2 | 2360 | page = c->page; |
5091b74a | 2361 | if (unlikely(!object || !node_match(page, node))) |
dfb4f096 | 2362 | object = __slab_alloc(s, gfpflags, node, addr, c); |
894b8788 CL |
2363 | |
2364 | else { | |
0ad9500e ED |
2365 | void *next_object = get_freepointer_safe(s, object); |
2366 | ||
8a5ec0ba | 2367 | /* |
25985edc | 2368 | * The cmpxchg will only match if there was no additional |
8a5ec0ba CL |
2369 | * operation and if we are on the right processor. |
2370 | * | |
2371 | * The cmpxchg does the following atomically (without lock semantics!) | |
2372 | * 1. Relocate first pointer to the current per cpu area. | |
2373 | * 2. Verify that tid and freelist have not been changed | |
2374 | * 3. If they were not changed replace tid and freelist | |
2375 | * | |
2376 | * Since this is without lock semantics the protection is only against | |
2377 | * code executing on this cpu *not* from access by other cpus. | |
2378 | */ | |
933393f5 | 2379 | if (unlikely(!this_cpu_cmpxchg_double( |
8a5ec0ba CL |
2380 | s->cpu_slab->freelist, s->cpu_slab->tid, |
2381 | object, tid, | |
0ad9500e | 2382 | next_object, next_tid(tid)))) { |
8a5ec0ba CL |
2383 | |
2384 | note_cmpxchg_failure("slab_alloc", s, tid); | |
2385 | goto redo; | |
2386 | } | |
0ad9500e | 2387 | prefetch_freepointer(s, next_object); |
84e554e6 | 2388 | stat(s, ALLOC_FASTPATH); |
894b8788 | 2389 | } |
8a5ec0ba | 2390 | |
74e2134f | 2391 | if (unlikely(gfpflags & __GFP_ZERO) && object) |
3b0efdfa | 2392 | memset(object, 0, s->object_size); |
d07dbea4 | 2393 | |
c016b0bd | 2394 | slab_post_alloc_hook(s, gfpflags, object); |
5a896d9e | 2395 | |
894b8788 | 2396 | return object; |
81819f0f CL |
2397 | } |
2398 | ||
2b847c3c EG |
2399 | static __always_inline void *slab_alloc(struct kmem_cache *s, |
2400 | gfp_t gfpflags, unsigned long addr) | |
2401 | { | |
2402 | return slab_alloc_node(s, gfpflags, NUMA_NO_NODE, addr); | |
2403 | } | |
2404 | ||
81819f0f CL |
2405 | void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) |
2406 | { | |
2b847c3c | 2407 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
5b882be4 | 2408 | |
3b0efdfa | 2409 | trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size, s->size, gfpflags); |
5b882be4 EGM |
2410 | |
2411 | return ret; | |
81819f0f CL |
2412 | } |
2413 | EXPORT_SYMBOL(kmem_cache_alloc); | |
2414 | ||
0f24f128 | 2415 | #ifdef CONFIG_TRACING |
4a92379b RK |
2416 | void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) |
2417 | { | |
2b847c3c | 2418 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
4a92379b RK |
2419 | trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); |
2420 | return ret; | |
2421 | } | |
2422 | EXPORT_SYMBOL(kmem_cache_alloc_trace); | |
2423 | ||
2424 | void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) | |
5b882be4 | 2425 | { |
4a92379b RK |
2426 | void *ret = kmalloc_order(size, flags, order); |
2427 | trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << order, flags); | |
2428 | return ret; | |
5b882be4 | 2429 | } |
4a92379b | 2430 | EXPORT_SYMBOL(kmalloc_order_trace); |
5b882be4 EGM |
2431 | #endif |
2432 | ||
81819f0f CL |
2433 | #ifdef CONFIG_NUMA |
2434 | void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) | |
2435 | { | |
2b847c3c | 2436 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
5b882be4 | 2437 | |
ca2b84cb | 2438 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
3b0efdfa | 2439 | s->object_size, s->size, gfpflags, node); |
5b882be4 EGM |
2440 | |
2441 | return ret; | |
81819f0f CL |
2442 | } |
2443 | EXPORT_SYMBOL(kmem_cache_alloc_node); | |
81819f0f | 2444 | |
0f24f128 | 2445 | #ifdef CONFIG_TRACING |
4a92379b | 2446 | void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
5b882be4 | 2447 | gfp_t gfpflags, |
4a92379b | 2448 | int node, size_t size) |
5b882be4 | 2449 | { |
2b847c3c | 2450 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
4a92379b RK |
2451 | |
2452 | trace_kmalloc_node(_RET_IP_, ret, | |
2453 | size, s->size, gfpflags, node); | |
2454 | return ret; | |
5b882be4 | 2455 | } |
4a92379b | 2456 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
5b882be4 | 2457 | #endif |
5d1f57e4 | 2458 | #endif |
5b882be4 | 2459 | |
81819f0f | 2460 | /* |
894b8788 CL |
2461 | * Slow patch handling. This may still be called frequently since objects |
2462 | * have a longer lifetime than the cpu slabs in most processing loads. | |
81819f0f | 2463 | * |
894b8788 CL |
2464 | * So we still attempt to reduce cache line usage. Just take the slab |
2465 | * lock and free the item. If there is no additional partial page | |
2466 | * handling required then we can return immediately. | |
81819f0f | 2467 | */ |
894b8788 | 2468 | static void __slab_free(struct kmem_cache *s, struct page *page, |
ff12059e | 2469 | void *x, unsigned long addr) |
81819f0f CL |
2470 | { |
2471 | void *prior; | |
2472 | void **object = (void *)x; | |
2cfb7455 | 2473 | int was_frozen; |
2cfb7455 CL |
2474 | struct page new; |
2475 | unsigned long counters; | |
2476 | struct kmem_cache_node *n = NULL; | |
61728d1e | 2477 | unsigned long uninitialized_var(flags); |
81819f0f | 2478 | |
8a5ec0ba | 2479 | stat(s, FREE_SLOWPATH); |
81819f0f | 2480 | |
19c7ff9e CL |
2481 | if (kmem_cache_debug(s) && |
2482 | !(n = free_debug_processing(s, page, x, addr, &flags))) | |
80f08c19 | 2483 | return; |
6446faa2 | 2484 | |
2cfb7455 | 2485 | do { |
837d678d JK |
2486 | if (unlikely(n)) { |
2487 | spin_unlock_irqrestore(&n->list_lock, flags); | |
2488 | n = NULL; | |
2489 | } | |
2cfb7455 CL |
2490 | prior = page->freelist; |
2491 | counters = page->counters; | |
2492 | set_freepointer(s, object, prior); | |
2493 | new.counters = counters; | |
2494 | was_frozen = new.frozen; | |
2495 | new.inuse--; | |
837d678d | 2496 | if ((!new.inuse || !prior) && !was_frozen) { |
49e22585 CL |
2497 | |
2498 | if (!kmem_cache_debug(s) && !prior) | |
2499 | ||
2500 | /* | |
2501 | * Slab was on no list before and will be partially empty | |
2502 | * We can defer the list move and instead freeze it. | |
2503 | */ | |
2504 | new.frozen = 1; | |
2505 | ||
2506 | else { /* Needs to be taken off a list */ | |
2507 | ||
2508 | n = get_node(s, page_to_nid(page)); | |
2509 | /* | |
2510 | * Speculatively acquire the list_lock. | |
2511 | * If the cmpxchg does not succeed then we may | |
2512 | * drop the list_lock without any processing. | |
2513 | * | |
2514 | * Otherwise the list_lock will synchronize with | |
2515 | * other processors updating the list of slabs. | |
2516 | */ | |
2517 | spin_lock_irqsave(&n->list_lock, flags); | |
2518 | ||
2519 | } | |
2cfb7455 | 2520 | } |
81819f0f | 2521 | |
2cfb7455 CL |
2522 | } while (!cmpxchg_double_slab(s, page, |
2523 | prior, counters, | |
2524 | object, new.counters, | |
2525 | "__slab_free")); | |
81819f0f | 2526 | |
2cfb7455 | 2527 | if (likely(!n)) { |
49e22585 CL |
2528 | |
2529 | /* | |
2530 | * If we just froze the page then put it onto the | |
2531 | * per cpu partial list. | |
2532 | */ | |
8028dcea | 2533 | if (new.frozen && !was_frozen) { |
49e22585 | 2534 | put_cpu_partial(s, page, 1); |
8028dcea AS |
2535 | stat(s, CPU_PARTIAL_FREE); |
2536 | } | |
49e22585 | 2537 | /* |
2cfb7455 CL |
2538 | * The list lock was not taken therefore no list |
2539 | * activity can be necessary. | |
2540 | */ | |
2541 | if (was_frozen) | |
2542 | stat(s, FREE_FROZEN); | |
80f08c19 | 2543 | return; |
2cfb7455 | 2544 | } |
81819f0f | 2545 | |
837d678d JK |
2546 | if (unlikely(!new.inuse && n->nr_partial > s->min_partial)) |
2547 | goto slab_empty; | |
2548 | ||
81819f0f | 2549 | /* |
837d678d JK |
2550 | * Objects left in the slab. If it was not on the partial list before |
2551 | * then add it. | |
81819f0f | 2552 | */ |
837d678d JK |
2553 | if (kmem_cache_debug(s) && unlikely(!prior)) { |
2554 | remove_full(s, page); | |
2555 | add_partial(n, page, DEACTIVATE_TO_TAIL); | |
2556 | stat(s, FREE_ADD_PARTIAL); | |
8ff12cfc | 2557 | } |
80f08c19 | 2558 | spin_unlock_irqrestore(&n->list_lock, flags); |
81819f0f CL |
2559 | return; |
2560 | ||
2561 | slab_empty: | |
a973e9dd | 2562 | if (prior) { |
81819f0f | 2563 | /* |
6fbabb20 | 2564 | * Slab on the partial list. |
81819f0f | 2565 | */ |
5cc6eee8 | 2566 | remove_partial(n, page); |
84e554e6 | 2567 | stat(s, FREE_REMOVE_PARTIAL); |
6fbabb20 CL |
2568 | } else |
2569 | /* Slab must be on the full list */ | |
2570 | remove_full(s, page); | |
2cfb7455 | 2571 | |
80f08c19 | 2572 | spin_unlock_irqrestore(&n->list_lock, flags); |
84e554e6 | 2573 | stat(s, FREE_SLAB); |
81819f0f | 2574 | discard_slab(s, page); |
81819f0f CL |
2575 | } |
2576 | ||
894b8788 CL |
2577 | /* |
2578 | * Fastpath with forced inlining to produce a kfree and kmem_cache_free that | |
2579 | * can perform fastpath freeing without additional function calls. | |
2580 | * | |
2581 | * The fastpath is only possible if we are freeing to the current cpu slab | |
2582 | * of this processor. This typically the case if we have just allocated | |
2583 | * the item before. | |
2584 | * | |
2585 | * If fastpath is not possible then fall back to __slab_free where we deal | |
2586 | * with all sorts of special processing. | |
2587 | */ | |
06428780 | 2588 | static __always_inline void slab_free(struct kmem_cache *s, |
ce71e27c | 2589 | struct page *page, void *x, unsigned long addr) |
894b8788 CL |
2590 | { |
2591 | void **object = (void *)x; | |
dfb4f096 | 2592 | struct kmem_cache_cpu *c; |
8a5ec0ba | 2593 | unsigned long tid; |
1f84260c | 2594 | |
c016b0bd CL |
2595 | slab_free_hook(s, x); |
2596 | ||
8a5ec0ba CL |
2597 | redo: |
2598 | /* | |
2599 | * Determine the currently cpus per cpu slab. | |
2600 | * The cpu may change afterward. However that does not matter since | |
2601 | * data is retrieved via this pointer. If we are on the same cpu | |
2602 | * during the cmpxchg then the free will succedd. | |
2603 | */ | |
7cccd80b | 2604 | preempt_disable(); |
9dfc6e68 | 2605 | c = __this_cpu_ptr(s->cpu_slab); |
c016b0bd | 2606 | |
8a5ec0ba | 2607 | tid = c->tid; |
7cccd80b | 2608 | preempt_enable(); |
c016b0bd | 2609 | |
442b06bc | 2610 | if (likely(page == c->page)) { |
ff12059e | 2611 | set_freepointer(s, object, c->freelist); |
8a5ec0ba | 2612 | |
933393f5 | 2613 | if (unlikely(!this_cpu_cmpxchg_double( |
8a5ec0ba CL |
2614 | s->cpu_slab->freelist, s->cpu_slab->tid, |
2615 | c->freelist, tid, | |
2616 | object, next_tid(tid)))) { | |
2617 | ||
2618 | note_cmpxchg_failure("slab_free", s, tid); | |
2619 | goto redo; | |
2620 | } | |
84e554e6 | 2621 | stat(s, FREE_FASTPATH); |
894b8788 | 2622 | } else |
ff12059e | 2623 | __slab_free(s, page, x, addr); |
894b8788 | 2624 | |
894b8788 CL |
2625 | } |
2626 | ||
81819f0f CL |
2627 | void kmem_cache_free(struct kmem_cache *s, void *x) |
2628 | { | |
b9ce5ef4 GC |
2629 | s = cache_from_obj(s, x); |
2630 | if (!s) | |
79576102 | 2631 | return; |
b9ce5ef4 | 2632 | slab_free(s, virt_to_head_page(x), x, _RET_IP_); |
ca2b84cb | 2633 | trace_kmem_cache_free(_RET_IP_, x); |
81819f0f CL |
2634 | } |
2635 | EXPORT_SYMBOL(kmem_cache_free); | |
2636 | ||
81819f0f | 2637 | /* |
672bba3a CL |
2638 | * Object placement in a slab is made very easy because we always start at |
2639 | * offset 0. If we tune the size of the object to the alignment then we can | |
2640 | * get the required alignment by putting one properly sized object after | |
2641 | * another. | |
81819f0f CL |
2642 | * |
2643 | * Notice that the allocation order determines the sizes of the per cpu | |
2644 | * caches. Each processor has always one slab available for allocations. | |
2645 | * Increasing the allocation order reduces the number of times that slabs | |
672bba3a | 2646 | * must be moved on and off the partial lists and is therefore a factor in |
81819f0f | 2647 | * locking overhead. |
81819f0f CL |
2648 | */ |
2649 | ||
2650 | /* | |
2651 | * Mininum / Maximum order of slab pages. This influences locking overhead | |
2652 | * and slab fragmentation. A higher order reduces the number of partial slabs | |
2653 | * and increases the number of allocations possible without having to | |
2654 | * take the list_lock. | |
2655 | */ | |
2656 | static int slub_min_order; | |
114e9e89 | 2657 | static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; |
9b2cd506 | 2658 | static int slub_min_objects; |
81819f0f CL |
2659 | |
2660 | /* | |
2661 | * Merge control. If this is set then no merging of slab caches will occur. | |
672bba3a | 2662 | * (Could be removed. This was introduced to pacify the merge skeptics.) |
81819f0f CL |
2663 | */ |
2664 | static int slub_nomerge; | |
2665 | ||
81819f0f CL |
2666 | /* |
2667 | * Calculate the order of allocation given an slab object size. | |
2668 | * | |
672bba3a CL |
2669 | * The order of allocation has significant impact on performance and other |
2670 | * system components. Generally order 0 allocations should be preferred since | |
2671 | * order 0 does not cause fragmentation in the page allocator. Larger objects | |
2672 | * be problematic to put into order 0 slabs because there may be too much | |
c124f5b5 | 2673 | * unused space left. We go to a higher order if more than 1/16th of the slab |
672bba3a CL |
2674 | * would be wasted. |
2675 | * | |
2676 | * In order to reach satisfactory performance we must ensure that a minimum | |
2677 | * number of objects is in one slab. Otherwise we may generate too much | |
2678 | * activity on the partial lists which requires taking the list_lock. This is | |
2679 | * less a concern for large slabs though which are rarely used. | |
81819f0f | 2680 | * |
672bba3a CL |
2681 | * slub_max_order specifies the order where we begin to stop considering the |
2682 | * number of objects in a slab as critical. If we reach slub_max_order then | |
2683 | * we try to keep the page order as low as possible. So we accept more waste | |
2684 | * of space in favor of a small page order. | |
81819f0f | 2685 | * |
672bba3a CL |
2686 | * Higher order allocations also allow the placement of more objects in a |
2687 | * slab and thereby reduce object handling overhead. If the user has | |
2688 | * requested a higher mininum order then we start with that one instead of | |
2689 | * the smallest order which will fit the object. | |
81819f0f | 2690 | */ |
5e6d444e | 2691 | static inline int slab_order(int size, int min_objects, |
ab9a0f19 | 2692 | int max_order, int fract_leftover, int reserved) |
81819f0f CL |
2693 | { |
2694 | int order; | |
2695 | int rem; | |
6300ea75 | 2696 | int min_order = slub_min_order; |
81819f0f | 2697 | |
ab9a0f19 | 2698 | if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE) |
210b5c06 | 2699 | return get_order(size * MAX_OBJS_PER_PAGE) - 1; |
39b26464 | 2700 | |
6300ea75 | 2701 | for (order = max(min_order, |
5e6d444e CL |
2702 | fls(min_objects * size - 1) - PAGE_SHIFT); |
2703 | order <= max_order; order++) { | |
81819f0f | 2704 | |
5e6d444e | 2705 | unsigned long slab_size = PAGE_SIZE << order; |
81819f0f | 2706 | |
ab9a0f19 | 2707 | if (slab_size < min_objects * size + reserved) |
81819f0f CL |
2708 | continue; |
2709 | ||
ab9a0f19 | 2710 | rem = (slab_size - reserved) % size; |
81819f0f | 2711 | |
5e6d444e | 2712 | if (rem <= slab_size / fract_leftover) |
81819f0f CL |
2713 | break; |
2714 | ||
2715 | } | |
672bba3a | 2716 | |
81819f0f CL |
2717 | return order; |
2718 | } | |
2719 | ||
ab9a0f19 | 2720 | static inline int calculate_order(int size, int reserved) |
5e6d444e CL |
2721 | { |
2722 | int order; | |
2723 | int min_objects; | |
2724 | int fraction; | |
e8120ff1 | 2725 | int max_objects; |
5e6d444e CL |
2726 | |
2727 | /* | |
2728 | * Attempt to find best configuration for a slab. This | |
2729 | * works by first attempting to generate a layout with | |
2730 | * the best configuration and backing off gradually. | |
2731 | * | |
2732 | * First we reduce the acceptable waste in a slab. Then | |
2733 | * we reduce the minimum objects required in a slab. | |
2734 | */ | |
2735 | min_objects = slub_min_objects; | |
9b2cd506 CL |
2736 | if (!min_objects) |
2737 | min_objects = 4 * (fls(nr_cpu_ids) + 1); | |
ab9a0f19 | 2738 | max_objects = order_objects(slub_max_order, size, reserved); |
e8120ff1 ZY |
2739 | min_objects = min(min_objects, max_objects); |
2740 | ||
5e6d444e | 2741 | while (min_objects > 1) { |
c124f5b5 | 2742 | fraction = 16; |
5e6d444e CL |
2743 | while (fraction >= 4) { |
2744 | order = slab_order(size, min_objects, | |
ab9a0f19 | 2745 | slub_max_order, fraction, reserved); |
5e6d444e CL |
2746 | if (order <= slub_max_order) |
2747 | return order; | |
2748 | fraction /= 2; | |
2749 | } | |
5086c389 | 2750 | min_objects--; |
5e6d444e CL |
2751 | } |
2752 | ||
2753 | /* | |
2754 | * We were unable to place multiple objects in a slab. Now | |
2755 | * lets see if we can place a single object there. | |
2756 | */ | |
ab9a0f19 | 2757 | order = slab_order(size, 1, slub_max_order, 1, reserved); |
5e6d444e CL |
2758 | if (order <= slub_max_order) |
2759 | return order; | |
2760 | ||
2761 | /* | |
2762 | * Doh this slab cannot be placed using slub_max_order. | |
2763 | */ | |
ab9a0f19 | 2764 | order = slab_order(size, 1, MAX_ORDER, 1, reserved); |
818cf590 | 2765 | if (order < MAX_ORDER) |
5e6d444e CL |
2766 | return order; |
2767 | return -ENOSYS; | |
2768 | } | |
2769 | ||
5595cffc | 2770 | static void |
4053497d | 2771 | init_kmem_cache_node(struct kmem_cache_node *n) |
81819f0f CL |
2772 | { |
2773 | n->nr_partial = 0; | |
81819f0f CL |
2774 | spin_lock_init(&n->list_lock); |
2775 | INIT_LIST_HEAD(&n->partial); | |
8ab1372f | 2776 | #ifdef CONFIG_SLUB_DEBUG |
0f389ec6 | 2777 | atomic_long_set(&n->nr_slabs, 0); |
02b71b70 | 2778 | atomic_long_set(&n->total_objects, 0); |
643b1138 | 2779 | INIT_LIST_HEAD(&n->full); |
8ab1372f | 2780 | #endif |
81819f0f CL |
2781 | } |
2782 | ||
55136592 | 2783 | static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) |
4c93c355 | 2784 | { |
6c182dc0 | 2785 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < |
95a05b42 | 2786 | KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu)); |
4c93c355 | 2787 | |
8a5ec0ba | 2788 | /* |
d4d84fef CM |
2789 | * Must align to double word boundary for the double cmpxchg |
2790 | * instructions to work; see __pcpu_double_call_return_bool(). | |
8a5ec0ba | 2791 | */ |
d4d84fef CM |
2792 | s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), |
2793 | 2 * sizeof(void *)); | |
8a5ec0ba CL |
2794 | |
2795 | if (!s->cpu_slab) | |
2796 | return 0; | |
2797 | ||
2798 | init_kmem_cache_cpus(s); | |
4c93c355 | 2799 | |
8a5ec0ba | 2800 | return 1; |
4c93c355 | 2801 | } |
4c93c355 | 2802 | |
51df1142 CL |
2803 | static struct kmem_cache *kmem_cache_node; |
2804 | ||
81819f0f CL |
2805 | /* |
2806 | * No kmalloc_node yet so do it by hand. We know that this is the first | |
2807 | * slab on the node for this slabcache. There are no concurrent accesses | |
2808 | * possible. | |
2809 | * | |
2810 | * Note that this function only works on the kmalloc_node_cache | |
4c93c355 CL |
2811 | * when allocating for the kmalloc_node_cache. This is used for bootstrapping |
2812 | * memory on a fresh node that has no slab structures yet. | |
81819f0f | 2813 | */ |
55136592 | 2814 | static void early_kmem_cache_node_alloc(int node) |
81819f0f CL |
2815 | { |
2816 | struct page *page; | |
2817 | struct kmem_cache_node *n; | |
2818 | ||
51df1142 | 2819 | BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node)); |
81819f0f | 2820 | |
51df1142 | 2821 | page = new_slab(kmem_cache_node, GFP_NOWAIT, node); |
81819f0f CL |
2822 | |
2823 | BUG_ON(!page); | |
a2f92ee7 CL |
2824 | if (page_to_nid(page) != node) { |
2825 | printk(KERN_ERR "SLUB: Unable to allocate memory from " | |
2826 | "node %d\n", node); | |
2827 | printk(KERN_ERR "SLUB: Allocating a useless per node structure " | |
2828 | "in order to be able to continue\n"); | |
2829 | } | |
2830 | ||
81819f0f CL |
2831 | n = page->freelist; |
2832 | BUG_ON(!n); | |
51df1142 | 2833 | page->freelist = get_freepointer(kmem_cache_node, n); |
e6e82ea1 | 2834 | page->inuse = 1; |
8cb0a506 | 2835 | page->frozen = 0; |
51df1142 | 2836 | kmem_cache_node->node[node] = n; |
8ab1372f | 2837 | #ifdef CONFIG_SLUB_DEBUG |
f7cb1933 | 2838 | init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); |
51df1142 | 2839 | init_tracking(kmem_cache_node, n); |
8ab1372f | 2840 | #endif |
4053497d | 2841 | init_kmem_cache_node(n); |
51df1142 | 2842 | inc_slabs_node(kmem_cache_node, node, page->objects); |
6446faa2 | 2843 | |
136333d1 | 2844 | add_partial(n, page, DEACTIVATE_TO_HEAD); |
81819f0f CL |
2845 | } |
2846 | ||
2847 | static void free_kmem_cache_nodes(struct kmem_cache *s) | |
2848 | { | |
2849 | int node; | |
2850 | ||
f64dc58c | 2851 | for_each_node_state(node, N_NORMAL_MEMORY) { |
81819f0f | 2852 | struct kmem_cache_node *n = s->node[node]; |
51df1142 | 2853 | |
73367bd8 | 2854 | if (n) |
51df1142 CL |
2855 | kmem_cache_free(kmem_cache_node, n); |
2856 | ||
81819f0f CL |
2857 | s->node[node] = NULL; |
2858 | } | |
2859 | } | |
2860 | ||
55136592 | 2861 | static int init_kmem_cache_nodes(struct kmem_cache *s) |
81819f0f CL |
2862 | { |
2863 | int node; | |
81819f0f | 2864 | |
f64dc58c | 2865 | for_each_node_state(node, N_NORMAL_MEMORY) { |
81819f0f CL |
2866 | struct kmem_cache_node *n; |
2867 | ||
73367bd8 | 2868 | if (slab_state == DOWN) { |
55136592 | 2869 | early_kmem_cache_node_alloc(node); |
73367bd8 AD |
2870 | continue; |
2871 | } | |
51df1142 | 2872 | n = kmem_cache_alloc_node(kmem_cache_node, |
55136592 | 2873 | GFP_KERNEL, node); |
81819f0f | 2874 | |
73367bd8 AD |
2875 | if (!n) { |
2876 | free_kmem_cache_nodes(s); | |
2877 | return 0; | |
81819f0f | 2878 | } |
73367bd8 | 2879 | |
81819f0f | 2880 | s->node[node] = n; |
4053497d | 2881 | init_kmem_cache_node(n); |
81819f0f CL |
2882 | } |
2883 | return 1; | |
2884 | } | |
81819f0f | 2885 | |
c0bdb232 | 2886 | static void set_min_partial(struct kmem_cache *s, unsigned long min) |
3b89d7d8 DR |
2887 | { |
2888 | if (min < MIN_PARTIAL) | |
2889 | min = MIN_PARTIAL; | |
2890 | else if (min > MAX_PARTIAL) | |
2891 | min = MAX_PARTIAL; | |
2892 | s->min_partial = min; | |
2893 | } | |
2894 | ||
81819f0f CL |
2895 | /* |
2896 | * calculate_sizes() determines the order and the distribution of data within | |
2897 | * a slab object. | |
2898 | */ | |
06b285dc | 2899 | static int calculate_sizes(struct kmem_cache *s, int forced_order) |
81819f0f CL |
2900 | { |
2901 | unsigned long flags = s->flags; | |
3b0efdfa | 2902 | unsigned long size = s->object_size; |
834f3d11 | 2903 | int order; |
81819f0f | 2904 | |
d8b42bf5 CL |
2905 | /* |
2906 | * Round up object size to the next word boundary. We can only | |
2907 | * place the free pointer at word boundaries and this determines | |
2908 | * the possible location of the free pointer. | |
2909 | */ | |
2910 | size = ALIGN(size, sizeof(void *)); | |
2911 | ||
2912 | #ifdef CONFIG_SLUB_DEBUG | |
81819f0f CL |
2913 | /* |
2914 | * Determine if we can poison the object itself. If the user of | |
2915 | * the slab may touch the object after free or before allocation | |
2916 | * then we should never poison the object itself. | |
2917 | */ | |
2918 | if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) && | |
c59def9f | 2919 | !s->ctor) |
81819f0f CL |
2920 | s->flags |= __OBJECT_POISON; |
2921 | else | |
2922 | s->flags &= ~__OBJECT_POISON; | |
2923 | ||
81819f0f CL |
2924 | |
2925 | /* | |
672bba3a | 2926 | * If we are Redzoning then check if there is some space between the |
81819f0f | 2927 | * end of the object and the free pointer. If not then add an |
672bba3a | 2928 | * additional word to have some bytes to store Redzone information. |
81819f0f | 2929 | */ |
3b0efdfa | 2930 | if ((flags & SLAB_RED_ZONE) && size == s->object_size) |
81819f0f | 2931 | size += sizeof(void *); |
41ecc55b | 2932 | #endif |
81819f0f CL |
2933 | |
2934 | /* | |
672bba3a CL |
2935 | * With that we have determined the number of bytes in actual use |
2936 | * by the object. This is the potential offset to the free pointer. | |
81819f0f CL |
2937 | */ |
2938 | s->inuse = size; | |
2939 | ||
2940 | if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) || | |
c59def9f | 2941 | s->ctor)) { |
81819f0f CL |
2942 | /* |
2943 | * Relocate free pointer after the object if it is not | |
2944 | * permitted to overwrite the first word of the object on | |
2945 | * kmem_cache_free. | |
2946 | * | |
2947 | * This is the case if we do RCU, have a constructor or | |
2948 | * destructor or are poisoning the objects. | |
2949 | */ | |
2950 | s->offset = size; | |
2951 | size += sizeof(void *); | |
2952 | } | |
2953 | ||
c12b3c62 | 2954 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f CL |
2955 | if (flags & SLAB_STORE_USER) |
2956 | /* | |
2957 | * Need to store information about allocs and frees after | |
2958 | * the object. | |
2959 | */ | |
2960 | size += 2 * sizeof(struct track); | |
2961 | ||
be7b3fbc | 2962 | if (flags & SLAB_RED_ZONE) |
81819f0f CL |
2963 | /* |
2964 | * Add some empty padding so that we can catch | |
2965 | * overwrites from earlier objects rather than let | |
2966 | * tracking information or the free pointer be | |
0211a9c8 | 2967 | * corrupted if a user writes before the start |
81819f0f CL |
2968 | * of the object. |
2969 | */ | |
2970 | size += sizeof(void *); | |
41ecc55b | 2971 | #endif |
672bba3a | 2972 | |
81819f0f CL |
2973 | /* |
2974 | * SLUB stores one object immediately after another beginning from | |
2975 | * offset 0. In order to align the objects we have to simply size | |
2976 | * each object to conform to the alignment. | |
2977 | */ | |
45906855 | 2978 | size = ALIGN(size, s->align); |
81819f0f | 2979 | s->size = size; |
06b285dc CL |
2980 | if (forced_order >= 0) |
2981 | order = forced_order; | |
2982 | else | |
ab9a0f19 | 2983 | order = calculate_order(size, s->reserved); |
81819f0f | 2984 | |
834f3d11 | 2985 | if (order < 0) |
81819f0f CL |
2986 | return 0; |
2987 | ||
b7a49f0d | 2988 | s->allocflags = 0; |
834f3d11 | 2989 | if (order) |
b7a49f0d CL |
2990 | s->allocflags |= __GFP_COMP; |
2991 | ||
2992 | if (s->flags & SLAB_CACHE_DMA) | |
2c59dd65 | 2993 | s->allocflags |= GFP_DMA; |
b7a49f0d CL |
2994 | |
2995 | if (s->flags & SLAB_RECLAIM_ACCOUNT) | |
2996 | s->allocflags |= __GFP_RECLAIMABLE; | |
2997 | ||
81819f0f CL |
2998 | /* |
2999 | * Determine the number of objects per slab | |
3000 | */ | |
ab9a0f19 LJ |
3001 | s->oo = oo_make(order, size, s->reserved); |
3002 | s->min = oo_make(get_order(size), size, s->reserved); | |
205ab99d CL |
3003 | if (oo_objects(s->oo) > oo_objects(s->max)) |
3004 | s->max = s->oo; | |
81819f0f | 3005 | |
834f3d11 | 3006 | return !!oo_objects(s->oo); |
81819f0f CL |
3007 | } |
3008 | ||
8a13a4cc | 3009 | static int kmem_cache_open(struct kmem_cache *s, unsigned long flags) |
81819f0f | 3010 | { |
8a13a4cc | 3011 | s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor); |
ab9a0f19 | 3012 | s->reserved = 0; |
81819f0f | 3013 | |
da9a638c LJ |
3014 | if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU)) |
3015 | s->reserved = sizeof(struct rcu_head); | |
81819f0f | 3016 | |
06b285dc | 3017 | if (!calculate_sizes(s, -1)) |
81819f0f | 3018 | goto error; |
3de47213 DR |
3019 | if (disable_higher_order_debug) { |
3020 | /* | |
3021 | * Disable debugging flags that store metadata if the min slab | |
3022 | * order increased. | |
3023 | */ | |
3b0efdfa | 3024 | if (get_order(s->size) > get_order(s->object_size)) { |
3de47213 DR |
3025 | s->flags &= ~DEBUG_METADATA_FLAGS; |
3026 | s->offset = 0; | |
3027 | if (!calculate_sizes(s, -1)) | |
3028 | goto error; | |
3029 | } | |
3030 | } | |
81819f0f | 3031 | |
2565409f HC |
3032 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
3033 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
b789ef51 CL |
3034 | if (system_has_cmpxchg_double() && (s->flags & SLAB_DEBUG_FLAGS) == 0) |
3035 | /* Enable fast mode */ | |
3036 | s->flags |= __CMPXCHG_DOUBLE; | |
3037 | #endif | |
3038 | ||
3b89d7d8 DR |
3039 | /* |
3040 | * The larger the object size is, the more pages we want on the partial | |
3041 | * list to avoid pounding the page allocator excessively. | |
3042 | */ | |
49e22585 CL |
3043 | set_min_partial(s, ilog2(s->size) / 2); |
3044 | ||
3045 | /* | |
3046 | * cpu_partial determined the maximum number of objects kept in the | |
3047 | * per cpu partial lists of a processor. | |
3048 | * | |
3049 | * Per cpu partial lists mainly contain slabs that just have one | |
3050 | * object freed. If they are used for allocation then they can be | |
3051 | * filled up again with minimal effort. The slab will never hit the | |
3052 | * per node partial lists and therefore no locking will be required. | |
3053 | * | |
3054 | * This setting also determines | |
3055 | * | |
3056 | * A) The number of objects from per cpu partial slabs dumped to the | |
3057 | * per node list when we reach the limit. | |
9f264904 | 3058 | * B) The number of objects in cpu partial slabs to extract from the |
49e22585 CL |
3059 | * per node list when we run out of per cpu objects. We only fetch 50% |
3060 | * to keep some capacity around for frees. | |
3061 | */ | |
8f1e33da CL |
3062 | if (kmem_cache_debug(s)) |
3063 | s->cpu_partial = 0; | |
3064 | else if (s->size >= PAGE_SIZE) | |
49e22585 CL |
3065 | s->cpu_partial = 2; |
3066 | else if (s->size >= 1024) | |
3067 | s->cpu_partial = 6; | |
3068 | else if (s->size >= 256) | |
3069 | s->cpu_partial = 13; | |
3070 | else | |
3071 | s->cpu_partial = 30; | |
3072 | ||
81819f0f | 3073 | #ifdef CONFIG_NUMA |
e2cb96b7 | 3074 | s->remote_node_defrag_ratio = 1000; |
81819f0f | 3075 | #endif |
55136592 | 3076 | if (!init_kmem_cache_nodes(s)) |
dfb4f096 | 3077 | goto error; |
81819f0f | 3078 | |
55136592 | 3079 | if (alloc_kmem_cache_cpus(s)) |
278b1bb1 | 3080 | return 0; |
ff12059e | 3081 | |
4c93c355 | 3082 | free_kmem_cache_nodes(s); |
81819f0f CL |
3083 | error: |
3084 | if (flags & SLAB_PANIC) | |
3085 | panic("Cannot create slab %s size=%lu realsize=%u " | |
3086 | "order=%u offset=%u flags=%lx\n", | |
8a13a4cc | 3087 | s->name, (unsigned long)s->size, s->size, oo_order(s->oo), |
81819f0f | 3088 | s->offset, flags); |
278b1bb1 | 3089 | return -EINVAL; |
81819f0f | 3090 | } |
81819f0f | 3091 | |
33b12c38 CL |
3092 | static void list_slab_objects(struct kmem_cache *s, struct page *page, |
3093 | const char *text) | |
3094 | { | |
3095 | #ifdef CONFIG_SLUB_DEBUG | |
3096 | void *addr = page_address(page); | |
3097 | void *p; | |
a5dd5c11 NK |
3098 | unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) * |
3099 | sizeof(long), GFP_ATOMIC); | |
bbd7d57b ED |
3100 | if (!map) |
3101 | return; | |
945cf2b6 | 3102 | slab_err(s, page, text, s->name); |
33b12c38 | 3103 | slab_lock(page); |
33b12c38 | 3104 | |
5f80b13a | 3105 | get_map(s, page, map); |
33b12c38 CL |
3106 | for_each_object(p, s, addr, page->objects) { |
3107 | ||
3108 | if (!test_bit(slab_index(p, s, addr), map)) { | |
3109 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu\n", | |
3110 | p, p - addr); | |
3111 | print_tracking(s, p); | |
3112 | } | |
3113 | } | |
3114 | slab_unlock(page); | |
bbd7d57b | 3115 | kfree(map); |
33b12c38 CL |
3116 | #endif |
3117 | } | |
3118 | ||
81819f0f | 3119 | /* |
599870b1 | 3120 | * Attempt to free all partial slabs on a node. |
69cb8e6b CL |
3121 | * This is called from kmem_cache_close(). We must be the last thread |
3122 | * using the cache and therefore we do not need to lock anymore. | |
81819f0f | 3123 | */ |
599870b1 | 3124 | static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) |
81819f0f | 3125 | { |
81819f0f CL |
3126 | struct page *page, *h; |
3127 | ||
33b12c38 | 3128 | list_for_each_entry_safe(page, h, &n->partial, lru) { |
81819f0f | 3129 | if (!page->inuse) { |
5cc6eee8 | 3130 | remove_partial(n, page); |
81819f0f | 3131 | discard_slab(s, page); |
33b12c38 CL |
3132 | } else { |
3133 | list_slab_objects(s, page, | |
945cf2b6 | 3134 | "Objects remaining in %s on kmem_cache_close()"); |
599870b1 | 3135 | } |
33b12c38 | 3136 | } |
81819f0f CL |
3137 | } |
3138 | ||
3139 | /* | |
672bba3a | 3140 | * Release all resources used by a slab cache. |
81819f0f | 3141 | */ |
0c710013 | 3142 | static inline int kmem_cache_close(struct kmem_cache *s) |
81819f0f CL |
3143 | { |
3144 | int node; | |
3145 | ||
3146 | flush_all(s); | |
81819f0f | 3147 | /* Attempt to free all objects */ |
f64dc58c | 3148 | for_each_node_state(node, N_NORMAL_MEMORY) { |
81819f0f CL |
3149 | struct kmem_cache_node *n = get_node(s, node); |
3150 | ||
599870b1 CL |
3151 | free_partial(s, n); |
3152 | if (n->nr_partial || slabs_node(s, node)) | |
81819f0f CL |
3153 | return 1; |
3154 | } | |
945cf2b6 | 3155 | free_percpu(s->cpu_slab); |
81819f0f CL |
3156 | free_kmem_cache_nodes(s); |
3157 | return 0; | |
3158 | } | |
3159 | ||
945cf2b6 | 3160 | int __kmem_cache_shutdown(struct kmem_cache *s) |
81819f0f | 3161 | { |
12c3667f | 3162 | int rc = kmem_cache_close(s); |
945cf2b6 | 3163 | |
5413dfba GC |
3164 | if (!rc) { |
3165 | /* | |
3166 | * We do the same lock strategy around sysfs_slab_add, see | |
3167 | * __kmem_cache_create. Because this is pretty much the last | |
3168 | * operation we do and the lock will be released shortly after | |
3169 | * that in slab_common.c, we could just move sysfs_slab_remove | |
3170 | * to a later point in common code. We should do that when we | |
3171 | * have a common sysfs framework for all allocators. | |
3172 | */ | |
3173 | mutex_unlock(&slab_mutex); | |
81819f0f | 3174 | sysfs_slab_remove(s); |
5413dfba GC |
3175 | mutex_lock(&slab_mutex); |
3176 | } | |
12c3667f CL |
3177 | |
3178 | return rc; | |
81819f0f | 3179 | } |
81819f0f CL |
3180 | |
3181 | /******************************************************************** | |
3182 | * Kmalloc subsystem | |
3183 | *******************************************************************/ | |
3184 | ||
81819f0f CL |
3185 | static int __init setup_slub_min_order(char *str) |
3186 | { | |
06428780 | 3187 | get_option(&str, &slub_min_order); |
81819f0f CL |
3188 | |
3189 | return 1; | |
3190 | } | |
3191 | ||
3192 | __setup("slub_min_order=", setup_slub_min_order); | |
3193 | ||
3194 | static int __init setup_slub_max_order(char *str) | |
3195 | { | |
06428780 | 3196 | get_option(&str, &slub_max_order); |
818cf590 | 3197 | slub_max_order = min(slub_max_order, MAX_ORDER - 1); |
81819f0f CL |
3198 | |
3199 | return 1; | |
3200 | } | |
3201 | ||
3202 | __setup("slub_max_order=", setup_slub_max_order); | |
3203 | ||
3204 | static int __init setup_slub_min_objects(char *str) | |
3205 | { | |
06428780 | 3206 | get_option(&str, &slub_min_objects); |
81819f0f CL |
3207 | |
3208 | return 1; | |
3209 | } | |
3210 | ||
3211 | __setup("slub_min_objects=", setup_slub_min_objects); | |
3212 | ||
3213 | static int __init setup_slub_nomerge(char *str) | |
3214 | { | |
3215 | slub_nomerge = 1; | |
3216 | return 1; | |
3217 | } | |
3218 | ||
3219 | __setup("slub_nomerge", setup_slub_nomerge); | |
3220 | ||
81819f0f CL |
3221 | void *__kmalloc(size_t size, gfp_t flags) |
3222 | { | |
aadb4bc4 | 3223 | struct kmem_cache *s; |
5b882be4 | 3224 | void *ret; |
81819f0f | 3225 | |
95a05b42 | 3226 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
eada35ef | 3227 | return kmalloc_large(size, flags); |
aadb4bc4 | 3228 | |
2c59dd65 | 3229 | s = kmalloc_slab(size, flags); |
aadb4bc4 CL |
3230 | |
3231 | if (unlikely(ZERO_OR_NULL_PTR(s))) | |
6cb8f913 CL |
3232 | return s; |
3233 | ||
2b847c3c | 3234 | ret = slab_alloc(s, flags, _RET_IP_); |
5b882be4 | 3235 | |
ca2b84cb | 3236 | trace_kmalloc(_RET_IP_, ret, size, s->size, flags); |
5b882be4 EGM |
3237 | |
3238 | return ret; | |
81819f0f CL |
3239 | } |
3240 | EXPORT_SYMBOL(__kmalloc); | |
3241 | ||
5d1f57e4 | 3242 | #ifdef CONFIG_NUMA |
f619cfe1 CL |
3243 | static void *kmalloc_large_node(size_t size, gfp_t flags, int node) |
3244 | { | |
b1eeab67 | 3245 | struct page *page; |
e4f7c0b4 | 3246 | void *ptr = NULL; |
f619cfe1 | 3247 | |
d79923fa | 3248 | flags |= __GFP_COMP | __GFP_NOTRACK | __GFP_KMEMCG; |
b1eeab67 | 3249 | page = alloc_pages_node(node, flags, get_order(size)); |
f619cfe1 | 3250 | if (page) |
e4f7c0b4 CM |
3251 | ptr = page_address(page); |
3252 | ||
3253 | kmemleak_alloc(ptr, size, 1, flags); | |
3254 | return ptr; | |
f619cfe1 CL |
3255 | } |
3256 | ||
81819f0f CL |
3257 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
3258 | { | |
aadb4bc4 | 3259 | struct kmem_cache *s; |
5b882be4 | 3260 | void *ret; |
81819f0f | 3261 | |
95a05b42 | 3262 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
5b882be4 EGM |
3263 | ret = kmalloc_large_node(size, flags, node); |
3264 | ||
ca2b84cb EGM |
3265 | trace_kmalloc_node(_RET_IP_, ret, |
3266 | size, PAGE_SIZE << get_order(size), | |
3267 | flags, node); | |
5b882be4 EGM |
3268 | |
3269 | return ret; | |
3270 | } | |
aadb4bc4 | 3271 | |
2c59dd65 | 3272 | s = kmalloc_slab(size, flags); |
aadb4bc4 CL |
3273 | |
3274 | if (unlikely(ZERO_OR_NULL_PTR(s))) | |
6cb8f913 CL |
3275 | return s; |
3276 | ||
2b847c3c | 3277 | ret = slab_alloc_node(s, flags, node, _RET_IP_); |
5b882be4 | 3278 | |
ca2b84cb | 3279 | trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); |
5b882be4 EGM |
3280 | |
3281 | return ret; | |
81819f0f CL |
3282 | } |
3283 | EXPORT_SYMBOL(__kmalloc_node); | |
3284 | #endif | |
3285 | ||
3286 | size_t ksize(const void *object) | |
3287 | { | |
272c1d21 | 3288 | struct page *page; |
81819f0f | 3289 | |
ef8b4520 | 3290 | if (unlikely(object == ZERO_SIZE_PTR)) |
272c1d21 CL |
3291 | return 0; |
3292 | ||
294a80a8 | 3293 | page = virt_to_head_page(object); |
294a80a8 | 3294 | |
76994412 PE |
3295 | if (unlikely(!PageSlab(page))) { |
3296 | WARN_ON(!PageCompound(page)); | |
294a80a8 | 3297 | return PAGE_SIZE << compound_order(page); |
76994412 | 3298 | } |
81819f0f | 3299 | |
1b4f59e3 | 3300 | return slab_ksize(page->slab_cache); |
81819f0f | 3301 | } |
b1aabecd | 3302 | EXPORT_SYMBOL(ksize); |
81819f0f | 3303 | |
d18a90dd BG |
3304 | #ifdef CONFIG_SLUB_DEBUG |
3305 | bool verify_mem_not_deleted(const void *x) | |
3306 | { | |
3307 | struct page *page; | |
3308 | void *object = (void *)x; | |
3309 | unsigned long flags; | |
3310 | bool rv; | |
3311 | ||
3312 | if (unlikely(ZERO_OR_NULL_PTR(x))) | |
3313 | return false; | |
3314 | ||
3315 | local_irq_save(flags); | |
3316 | ||
3317 | page = virt_to_head_page(x); | |
3318 | if (unlikely(!PageSlab(page))) { | |
3319 | /* maybe it was from stack? */ | |
3320 | rv = true; | |
3321 | goto out_unlock; | |
3322 | } | |
3323 | ||
3324 | slab_lock(page); | |
1b4f59e3 GC |
3325 | if (on_freelist(page->slab_cache, page, object)) { |
3326 | object_err(page->slab_cache, page, object, "Object is on free-list"); | |
d18a90dd BG |
3327 | rv = false; |
3328 | } else { | |
3329 | rv = true; | |
3330 | } | |
3331 | slab_unlock(page); | |
3332 | ||
3333 | out_unlock: | |
3334 | local_irq_restore(flags); | |
3335 | return rv; | |
3336 | } | |
3337 | EXPORT_SYMBOL(verify_mem_not_deleted); | |
3338 | #endif | |
3339 | ||
81819f0f CL |
3340 | void kfree(const void *x) |
3341 | { | |
81819f0f | 3342 | struct page *page; |
5bb983b0 | 3343 | void *object = (void *)x; |
81819f0f | 3344 | |
2121db74 PE |
3345 | trace_kfree(_RET_IP_, x); |
3346 | ||
2408c550 | 3347 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
81819f0f CL |
3348 | return; |
3349 | ||
b49af68f | 3350 | page = virt_to_head_page(x); |
aadb4bc4 | 3351 | if (unlikely(!PageSlab(page))) { |
0937502a | 3352 | BUG_ON(!PageCompound(page)); |
e4f7c0b4 | 3353 | kmemleak_free(x); |
d79923fa | 3354 | __free_memcg_kmem_pages(page, compound_order(page)); |
aadb4bc4 CL |
3355 | return; |
3356 | } | |
1b4f59e3 | 3357 | slab_free(page->slab_cache, page, object, _RET_IP_); |
81819f0f CL |
3358 | } |
3359 | EXPORT_SYMBOL(kfree); | |
3360 | ||
2086d26a | 3361 | /* |
672bba3a CL |
3362 | * kmem_cache_shrink removes empty slabs from the partial lists and sorts |
3363 | * the remaining slabs by the number of items in use. The slabs with the | |
3364 | * most items in use come first. New allocations will then fill those up | |
3365 | * and thus they can be removed from the partial lists. | |
3366 | * | |
3367 | * The slabs with the least items are placed last. This results in them | |
3368 | * being allocated from last increasing the chance that the last objects | |
3369 | * are freed in them. | |
2086d26a CL |
3370 | */ |
3371 | int kmem_cache_shrink(struct kmem_cache *s) | |
3372 | { | |
3373 | int node; | |
3374 | int i; | |
3375 | struct kmem_cache_node *n; | |
3376 | struct page *page; | |
3377 | struct page *t; | |
205ab99d | 3378 | int objects = oo_objects(s->max); |
2086d26a | 3379 | struct list_head *slabs_by_inuse = |
834f3d11 | 3380 | kmalloc(sizeof(struct list_head) * objects, GFP_KERNEL); |
2086d26a CL |
3381 | unsigned long flags; |
3382 | ||
3383 | if (!slabs_by_inuse) | |
3384 | return -ENOMEM; | |
3385 | ||
3386 | flush_all(s); | |
f64dc58c | 3387 | for_each_node_state(node, N_NORMAL_MEMORY) { |
2086d26a CL |
3388 | n = get_node(s, node); |
3389 | ||
3390 | if (!n->nr_partial) | |
3391 | continue; | |
3392 | ||
834f3d11 | 3393 | for (i = 0; i < objects; i++) |
2086d26a CL |
3394 | INIT_LIST_HEAD(slabs_by_inuse + i); |
3395 | ||
3396 | spin_lock_irqsave(&n->list_lock, flags); | |
3397 | ||
3398 | /* | |
672bba3a | 3399 | * Build lists indexed by the items in use in each slab. |
2086d26a | 3400 | * |
672bba3a CL |
3401 | * Note that concurrent frees may occur while we hold the |
3402 | * list_lock. page->inuse here is the upper limit. | |
2086d26a CL |
3403 | */ |
3404 | list_for_each_entry_safe(page, t, &n->partial, lru) { | |
69cb8e6b CL |
3405 | list_move(&page->lru, slabs_by_inuse + page->inuse); |
3406 | if (!page->inuse) | |
3407 | n->nr_partial--; | |
2086d26a CL |
3408 | } |
3409 | ||
2086d26a | 3410 | /* |
672bba3a CL |
3411 | * Rebuild the partial list with the slabs filled up most |
3412 | * first and the least used slabs at the end. | |
2086d26a | 3413 | */ |
69cb8e6b | 3414 | for (i = objects - 1; i > 0; i--) |
2086d26a CL |
3415 | list_splice(slabs_by_inuse + i, n->partial.prev); |
3416 | ||
2086d26a | 3417 | spin_unlock_irqrestore(&n->list_lock, flags); |
69cb8e6b CL |
3418 | |
3419 | /* Release empty slabs */ | |
3420 | list_for_each_entry_safe(page, t, slabs_by_inuse, lru) | |
3421 | discard_slab(s, page); | |
2086d26a CL |
3422 | } |
3423 | ||
3424 | kfree(slabs_by_inuse); | |
3425 | return 0; | |
3426 | } | |
3427 | EXPORT_SYMBOL(kmem_cache_shrink); | |
3428 | ||
b9049e23 YG |
3429 | static int slab_mem_going_offline_callback(void *arg) |
3430 | { | |
3431 | struct kmem_cache *s; | |
3432 | ||
18004c5d | 3433 | mutex_lock(&slab_mutex); |
b9049e23 YG |
3434 | list_for_each_entry(s, &slab_caches, list) |
3435 | kmem_cache_shrink(s); | |
18004c5d | 3436 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
3437 | |
3438 | return 0; | |
3439 | } | |
3440 | ||
3441 | static void slab_mem_offline_callback(void *arg) | |
3442 | { | |
3443 | struct kmem_cache_node *n; | |
3444 | struct kmem_cache *s; | |
3445 | struct memory_notify *marg = arg; | |
3446 | int offline_node; | |
3447 | ||
b9d5ab25 | 3448 | offline_node = marg->status_change_nid_normal; |
b9049e23 YG |
3449 | |
3450 | /* | |
3451 | * If the node still has available memory. we need kmem_cache_node | |
3452 | * for it yet. | |
3453 | */ | |
3454 | if (offline_node < 0) | |
3455 | return; | |
3456 | ||
18004c5d | 3457 | mutex_lock(&slab_mutex); |
b9049e23 YG |
3458 | list_for_each_entry(s, &slab_caches, list) { |
3459 | n = get_node(s, offline_node); | |
3460 | if (n) { | |
3461 | /* | |
3462 | * if n->nr_slabs > 0, slabs still exist on the node | |
3463 | * that is going down. We were unable to free them, | |
c9404c9c | 3464 | * and offline_pages() function shouldn't call this |
b9049e23 YG |
3465 | * callback. So, we must fail. |
3466 | */ | |
0f389ec6 | 3467 | BUG_ON(slabs_node(s, offline_node)); |
b9049e23 YG |
3468 | |
3469 | s->node[offline_node] = NULL; | |
8de66a0c | 3470 | kmem_cache_free(kmem_cache_node, n); |
b9049e23 YG |
3471 | } |
3472 | } | |
18004c5d | 3473 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
3474 | } |
3475 | ||
3476 | static int slab_mem_going_online_callback(void *arg) | |
3477 | { | |
3478 | struct kmem_cache_node *n; | |
3479 | struct kmem_cache *s; | |
3480 | struct memory_notify *marg = arg; | |
b9d5ab25 | 3481 | int nid = marg->status_change_nid_normal; |
b9049e23 YG |
3482 | int ret = 0; |
3483 | ||
3484 | /* | |
3485 | * If the node's memory is already available, then kmem_cache_node is | |
3486 | * already created. Nothing to do. | |
3487 | */ | |
3488 | if (nid < 0) | |
3489 | return 0; | |
3490 | ||
3491 | /* | |
0121c619 | 3492 | * We are bringing a node online. No memory is available yet. We must |
b9049e23 YG |
3493 | * allocate a kmem_cache_node structure in order to bring the node |
3494 | * online. | |
3495 | */ | |
18004c5d | 3496 | mutex_lock(&slab_mutex); |
b9049e23 YG |
3497 | list_for_each_entry(s, &slab_caches, list) { |
3498 | /* | |
3499 | * XXX: kmem_cache_alloc_node will fallback to other nodes | |
3500 | * since memory is not yet available from the node that | |
3501 | * is brought up. | |
3502 | */ | |
8de66a0c | 3503 | n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL); |
b9049e23 YG |
3504 | if (!n) { |
3505 | ret = -ENOMEM; | |
3506 | goto out; | |
3507 | } | |
4053497d | 3508 | init_kmem_cache_node(n); |
b9049e23 YG |
3509 | s->node[nid] = n; |
3510 | } | |
3511 | out: | |
18004c5d | 3512 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
3513 | return ret; |
3514 | } | |
3515 | ||
3516 | static int slab_memory_callback(struct notifier_block *self, | |
3517 | unsigned long action, void *arg) | |
3518 | { | |
3519 | int ret = 0; | |
3520 | ||
3521 | switch (action) { | |
3522 | case MEM_GOING_ONLINE: | |
3523 | ret = slab_mem_going_online_callback(arg); | |
3524 | break; | |
3525 | case MEM_GOING_OFFLINE: | |
3526 | ret = slab_mem_going_offline_callback(arg); | |
3527 | break; | |
3528 | case MEM_OFFLINE: | |
3529 | case MEM_CANCEL_ONLINE: | |
3530 | slab_mem_offline_callback(arg); | |
3531 | break; | |
3532 | case MEM_ONLINE: | |
3533 | case MEM_CANCEL_OFFLINE: | |
3534 | break; | |
3535 | } | |
dc19f9db KH |
3536 | if (ret) |
3537 | ret = notifier_from_errno(ret); | |
3538 | else | |
3539 | ret = NOTIFY_OK; | |
b9049e23 YG |
3540 | return ret; |
3541 | } | |
3542 | ||
3ac38faa AM |
3543 | static struct notifier_block slab_memory_callback_nb = { |
3544 | .notifier_call = slab_memory_callback, | |
3545 | .priority = SLAB_CALLBACK_PRI, | |
3546 | }; | |
b9049e23 | 3547 | |
81819f0f CL |
3548 | /******************************************************************** |
3549 | * Basic setup of slabs | |
3550 | *******************************************************************/ | |
3551 | ||
51df1142 CL |
3552 | /* |
3553 | * Used for early kmem_cache structures that were allocated using | |
dffb4d60 CL |
3554 | * the page allocator. Allocate them properly then fix up the pointers |
3555 | * that may be pointing to the wrong kmem_cache structure. | |
51df1142 CL |
3556 | */ |
3557 | ||
dffb4d60 | 3558 | static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache) |
51df1142 CL |
3559 | { |
3560 | int node; | |
dffb4d60 | 3561 | struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
51df1142 | 3562 | |
dffb4d60 | 3563 | memcpy(s, static_cache, kmem_cache->object_size); |
51df1142 | 3564 | |
7d557b3c GC |
3565 | /* |
3566 | * This runs very early, and only the boot processor is supposed to be | |
3567 | * up. Even if it weren't true, IRQs are not up so we couldn't fire | |
3568 | * IPIs around. | |
3569 | */ | |
3570 | __flush_cpu_slab(s, smp_processor_id()); | |
51df1142 CL |
3571 | for_each_node_state(node, N_NORMAL_MEMORY) { |
3572 | struct kmem_cache_node *n = get_node(s, node); | |
3573 | struct page *p; | |
3574 | ||
3575 | if (n) { | |
3576 | list_for_each_entry(p, &n->partial, lru) | |
1b4f59e3 | 3577 | p->slab_cache = s; |
51df1142 | 3578 | |
607bf324 | 3579 | #ifdef CONFIG_SLUB_DEBUG |
51df1142 | 3580 | list_for_each_entry(p, &n->full, lru) |
1b4f59e3 | 3581 | p->slab_cache = s; |
51df1142 CL |
3582 | #endif |
3583 | } | |
3584 | } | |
dffb4d60 CL |
3585 | list_add(&s->list, &slab_caches); |
3586 | return s; | |
51df1142 CL |
3587 | } |
3588 | ||
81819f0f CL |
3589 | void __init kmem_cache_init(void) |
3590 | { | |
dffb4d60 CL |
3591 | static __initdata struct kmem_cache boot_kmem_cache, |
3592 | boot_kmem_cache_node; | |
51df1142 | 3593 | |
fc8d8620 SG |
3594 | if (debug_guardpage_minorder()) |
3595 | slub_max_order = 0; | |
3596 | ||
dffb4d60 CL |
3597 | kmem_cache_node = &boot_kmem_cache_node; |
3598 | kmem_cache = &boot_kmem_cache; | |
51df1142 | 3599 | |
dffb4d60 CL |
3600 | create_boot_cache(kmem_cache_node, "kmem_cache_node", |
3601 | sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN); | |
b9049e23 | 3602 | |
3ac38faa | 3603 | register_hotmemory_notifier(&slab_memory_callback_nb); |
81819f0f CL |
3604 | |
3605 | /* Able to allocate the per node structures */ | |
3606 | slab_state = PARTIAL; | |
3607 | ||
dffb4d60 CL |
3608 | create_boot_cache(kmem_cache, "kmem_cache", |
3609 | offsetof(struct kmem_cache, node) + | |
3610 | nr_node_ids * sizeof(struct kmem_cache_node *), | |
3611 | SLAB_HWCACHE_ALIGN); | |
8a13a4cc | 3612 | |
dffb4d60 | 3613 | kmem_cache = bootstrap(&boot_kmem_cache); |
81819f0f | 3614 | |
51df1142 CL |
3615 | /* |
3616 | * Allocate kmem_cache_node properly from the kmem_cache slab. | |
3617 | * kmem_cache_node is separately allocated so no need to | |
3618 | * update any list pointers. | |
3619 | */ | |
dffb4d60 | 3620 | kmem_cache_node = bootstrap(&boot_kmem_cache_node); |
51df1142 CL |
3621 | |
3622 | /* Now we can use the kmem_cache to allocate kmalloc slabs */ | |
f97d5f63 | 3623 | create_kmalloc_caches(0); |
81819f0f CL |
3624 | |
3625 | #ifdef CONFIG_SMP | |
3626 | register_cpu_notifier(&slab_notifier); | |
9dfc6e68 | 3627 | #endif |
81819f0f | 3628 | |
3adbefee | 3629 | printk(KERN_INFO |
f97d5f63 | 3630 | "SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d," |
4b356be0 | 3631 | " CPUs=%d, Nodes=%d\n", |
f97d5f63 | 3632 | cache_line_size(), |
81819f0f CL |
3633 | slub_min_order, slub_max_order, slub_min_objects, |
3634 | nr_cpu_ids, nr_node_ids); | |
3635 | } | |
3636 | ||
7e85ee0c PE |
3637 | void __init kmem_cache_init_late(void) |
3638 | { | |
7e85ee0c PE |
3639 | } |
3640 | ||
81819f0f CL |
3641 | /* |
3642 | * Find a mergeable slab cache | |
3643 | */ | |
3644 | static int slab_unmergeable(struct kmem_cache *s) | |
3645 | { | |
3646 | if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE)) | |
3647 | return 1; | |
3648 | ||
c59def9f | 3649 | if (s->ctor) |
81819f0f CL |
3650 | return 1; |
3651 | ||
8ffa6875 CL |
3652 | /* |
3653 | * We may have set a slab to be unmergeable during bootstrap. | |
3654 | */ | |
3655 | if (s->refcount < 0) | |
3656 | return 1; | |
3657 | ||
81819f0f CL |
3658 | return 0; |
3659 | } | |
3660 | ||
2633d7a0 | 3661 | static struct kmem_cache *find_mergeable(struct mem_cgroup *memcg, size_t size, |
ba0268a8 | 3662 | size_t align, unsigned long flags, const char *name, |
51cc5068 | 3663 | void (*ctor)(void *)) |
81819f0f | 3664 | { |
5b95a4ac | 3665 | struct kmem_cache *s; |
81819f0f CL |
3666 | |
3667 | if (slub_nomerge || (flags & SLUB_NEVER_MERGE)) | |
3668 | return NULL; | |
3669 | ||
c59def9f | 3670 | if (ctor) |
81819f0f CL |
3671 | return NULL; |
3672 | ||
3673 | size = ALIGN(size, sizeof(void *)); | |
3674 | align = calculate_alignment(flags, align, size); | |
3675 | size = ALIGN(size, align); | |
ba0268a8 | 3676 | flags = kmem_cache_flags(size, flags, name, NULL); |
81819f0f | 3677 | |
5b95a4ac | 3678 | list_for_each_entry(s, &slab_caches, list) { |
81819f0f CL |
3679 | if (slab_unmergeable(s)) |
3680 | continue; | |
3681 | ||
3682 | if (size > s->size) | |
3683 | continue; | |
3684 | ||
ba0268a8 | 3685 | if ((flags & SLUB_MERGE_SAME) != (s->flags & SLUB_MERGE_SAME)) |
81819f0f CL |
3686 | continue; |
3687 | /* | |
3688 | * Check if alignment is compatible. | |
3689 | * Courtesy of Adrian Drzewiecki | |
3690 | */ | |
06428780 | 3691 | if ((s->size & ~(align - 1)) != s->size) |
81819f0f CL |
3692 | continue; |
3693 | ||
3694 | if (s->size - size >= sizeof(void *)) | |
3695 | continue; | |
3696 | ||
2633d7a0 GC |
3697 | if (!cache_match_memcg(s, memcg)) |
3698 | continue; | |
3699 | ||
81819f0f CL |
3700 | return s; |
3701 | } | |
3702 | return NULL; | |
3703 | } | |
3704 | ||
2633d7a0 GC |
3705 | struct kmem_cache * |
3706 | __kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size, | |
3707 | size_t align, unsigned long flags, void (*ctor)(void *)) | |
81819f0f CL |
3708 | { |
3709 | struct kmem_cache *s; | |
3710 | ||
2633d7a0 | 3711 | s = find_mergeable(memcg, size, align, flags, name, ctor); |
81819f0f CL |
3712 | if (s) { |
3713 | s->refcount++; | |
3714 | /* | |
3715 | * Adjust the object sizes so that we clear | |
3716 | * the complete object on kzalloc. | |
3717 | */ | |
3b0efdfa | 3718 | s->object_size = max(s->object_size, (int)size); |
81819f0f | 3719 | s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); |
6446faa2 | 3720 | |
7b8f3b66 | 3721 | if (sysfs_slab_alias(s, name)) { |
7b8f3b66 | 3722 | s->refcount--; |
cbb79694 | 3723 | s = NULL; |
7b8f3b66 | 3724 | } |
a0e1d1be | 3725 | } |
6446faa2 | 3726 | |
cbb79694 CL |
3727 | return s; |
3728 | } | |
84c1cf62 | 3729 | |
8a13a4cc | 3730 | int __kmem_cache_create(struct kmem_cache *s, unsigned long flags) |
cbb79694 | 3731 | { |
aac3a166 PE |
3732 | int err; |
3733 | ||
3734 | err = kmem_cache_open(s, flags); | |
3735 | if (err) | |
3736 | return err; | |
20cea968 | 3737 | |
45530c44 CL |
3738 | /* Mutex is not taken during early boot */ |
3739 | if (slab_state <= UP) | |
3740 | return 0; | |
3741 | ||
107dab5c | 3742 | memcg_propagate_slab_attrs(s); |
aac3a166 PE |
3743 | mutex_unlock(&slab_mutex); |
3744 | err = sysfs_slab_add(s); | |
3745 | mutex_lock(&slab_mutex); | |
20cea968 | 3746 | |
aac3a166 PE |
3747 | if (err) |
3748 | kmem_cache_close(s); | |
20cea968 | 3749 | |
aac3a166 | 3750 | return err; |
81819f0f | 3751 | } |
81819f0f | 3752 | |
81819f0f | 3753 | #ifdef CONFIG_SMP |
81819f0f | 3754 | /* |
672bba3a CL |
3755 | * Use the cpu notifier to insure that the cpu slabs are flushed when |
3756 | * necessary. | |
81819f0f CL |
3757 | */ |
3758 | static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb, | |
3759 | unsigned long action, void *hcpu) | |
3760 | { | |
3761 | long cpu = (long)hcpu; | |
5b95a4ac CL |
3762 | struct kmem_cache *s; |
3763 | unsigned long flags; | |
81819f0f CL |
3764 | |
3765 | switch (action) { | |
3766 | case CPU_UP_CANCELED: | |
8bb78442 | 3767 | case CPU_UP_CANCELED_FROZEN: |
81819f0f | 3768 | case CPU_DEAD: |
8bb78442 | 3769 | case CPU_DEAD_FROZEN: |
18004c5d | 3770 | mutex_lock(&slab_mutex); |
5b95a4ac CL |
3771 | list_for_each_entry(s, &slab_caches, list) { |
3772 | local_irq_save(flags); | |
3773 | __flush_cpu_slab(s, cpu); | |
3774 | local_irq_restore(flags); | |
3775 | } | |
18004c5d | 3776 | mutex_unlock(&slab_mutex); |
81819f0f CL |
3777 | break; |
3778 | default: | |
3779 | break; | |
3780 | } | |
3781 | return NOTIFY_OK; | |
3782 | } | |
3783 | ||
06428780 | 3784 | static struct notifier_block __cpuinitdata slab_notifier = { |
3adbefee | 3785 | .notifier_call = slab_cpuup_callback |
06428780 | 3786 | }; |
81819f0f CL |
3787 | |
3788 | #endif | |
3789 | ||
ce71e27c | 3790 | void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) |
81819f0f | 3791 | { |
aadb4bc4 | 3792 | struct kmem_cache *s; |
94b528d0 | 3793 | void *ret; |
aadb4bc4 | 3794 | |
95a05b42 | 3795 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
eada35ef PE |
3796 | return kmalloc_large(size, gfpflags); |
3797 | ||
2c59dd65 | 3798 | s = kmalloc_slab(size, gfpflags); |
81819f0f | 3799 | |
2408c550 | 3800 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
6cb8f913 | 3801 | return s; |
81819f0f | 3802 | |
2b847c3c | 3803 | ret = slab_alloc(s, gfpflags, caller); |
94b528d0 | 3804 | |
25985edc | 3805 | /* Honor the call site pointer we received. */ |
ca2b84cb | 3806 | trace_kmalloc(caller, ret, size, s->size, gfpflags); |
94b528d0 EGM |
3807 | |
3808 | return ret; | |
81819f0f CL |
3809 | } |
3810 | ||
5d1f57e4 | 3811 | #ifdef CONFIG_NUMA |
81819f0f | 3812 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, |
ce71e27c | 3813 | int node, unsigned long caller) |
81819f0f | 3814 | { |
aadb4bc4 | 3815 | struct kmem_cache *s; |
94b528d0 | 3816 | void *ret; |
aadb4bc4 | 3817 | |
95a05b42 | 3818 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
d3e14aa3 XF |
3819 | ret = kmalloc_large_node(size, gfpflags, node); |
3820 | ||
3821 | trace_kmalloc_node(caller, ret, | |
3822 | size, PAGE_SIZE << get_order(size), | |
3823 | gfpflags, node); | |
3824 | ||
3825 | return ret; | |
3826 | } | |
eada35ef | 3827 | |
2c59dd65 | 3828 | s = kmalloc_slab(size, gfpflags); |
81819f0f | 3829 | |
2408c550 | 3830 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
6cb8f913 | 3831 | return s; |
81819f0f | 3832 | |
2b847c3c | 3833 | ret = slab_alloc_node(s, gfpflags, node, caller); |
94b528d0 | 3834 | |
25985edc | 3835 | /* Honor the call site pointer we received. */ |
ca2b84cb | 3836 | trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node); |
94b528d0 EGM |
3837 | |
3838 | return ret; | |
81819f0f | 3839 | } |
5d1f57e4 | 3840 | #endif |
81819f0f | 3841 | |
ab4d5ed5 | 3842 | #ifdef CONFIG_SYSFS |
205ab99d CL |
3843 | static int count_inuse(struct page *page) |
3844 | { | |
3845 | return page->inuse; | |
3846 | } | |
3847 | ||
3848 | static int count_total(struct page *page) | |
3849 | { | |
3850 | return page->objects; | |
3851 | } | |
ab4d5ed5 | 3852 | #endif |
205ab99d | 3853 | |
ab4d5ed5 | 3854 | #ifdef CONFIG_SLUB_DEBUG |
434e245d CL |
3855 | static int validate_slab(struct kmem_cache *s, struct page *page, |
3856 | unsigned long *map) | |
53e15af0 CL |
3857 | { |
3858 | void *p; | |
a973e9dd | 3859 | void *addr = page_address(page); |
53e15af0 CL |
3860 | |
3861 | if (!check_slab(s, page) || | |
3862 | !on_freelist(s, page, NULL)) | |
3863 | return 0; | |
3864 | ||
3865 | /* Now we know that a valid freelist exists */ | |
39b26464 | 3866 | bitmap_zero(map, page->objects); |
53e15af0 | 3867 | |
5f80b13a CL |
3868 | get_map(s, page, map); |
3869 | for_each_object(p, s, addr, page->objects) { | |
3870 | if (test_bit(slab_index(p, s, addr), map)) | |
3871 | if (!check_object(s, page, p, SLUB_RED_INACTIVE)) | |
3872 | return 0; | |
53e15af0 CL |
3873 | } |
3874 | ||
224a88be | 3875 | for_each_object(p, s, addr, page->objects) |
7656c72b | 3876 | if (!test_bit(slab_index(p, s, addr), map)) |
37d57443 | 3877 | if (!check_object(s, page, p, SLUB_RED_ACTIVE)) |
53e15af0 CL |
3878 | return 0; |
3879 | return 1; | |
3880 | } | |
3881 | ||
434e245d CL |
3882 | static void validate_slab_slab(struct kmem_cache *s, struct page *page, |
3883 | unsigned long *map) | |
53e15af0 | 3884 | { |
881db7fb CL |
3885 | slab_lock(page); |
3886 | validate_slab(s, page, map); | |
3887 | slab_unlock(page); | |
53e15af0 CL |
3888 | } |
3889 | ||
434e245d CL |
3890 | static int validate_slab_node(struct kmem_cache *s, |
3891 | struct kmem_cache_node *n, unsigned long *map) | |
53e15af0 CL |
3892 | { |
3893 | unsigned long count = 0; | |
3894 | struct page *page; | |
3895 | unsigned long flags; | |
3896 | ||
3897 | spin_lock_irqsave(&n->list_lock, flags); | |
3898 | ||
3899 | list_for_each_entry(page, &n->partial, lru) { | |
434e245d | 3900 | validate_slab_slab(s, page, map); |
53e15af0 CL |
3901 | count++; |
3902 | } | |
3903 | if (count != n->nr_partial) | |
3904 | printk(KERN_ERR "SLUB %s: %ld partial slabs counted but " | |
3905 | "counter=%ld\n", s->name, count, n->nr_partial); | |
3906 | ||
3907 | if (!(s->flags & SLAB_STORE_USER)) | |
3908 | goto out; | |
3909 | ||
3910 | list_for_each_entry(page, &n->full, lru) { | |
434e245d | 3911 | validate_slab_slab(s, page, map); |
53e15af0 CL |
3912 | count++; |
3913 | } | |
3914 | if (count != atomic_long_read(&n->nr_slabs)) | |
3915 | printk(KERN_ERR "SLUB: %s %ld slabs counted but " | |
3916 | "counter=%ld\n", s->name, count, | |
3917 | atomic_long_read(&n->nr_slabs)); | |
3918 | ||
3919 | out: | |
3920 | spin_unlock_irqrestore(&n->list_lock, flags); | |
3921 | return count; | |
3922 | } | |
3923 | ||
434e245d | 3924 | static long validate_slab_cache(struct kmem_cache *s) |
53e15af0 CL |
3925 | { |
3926 | int node; | |
3927 | unsigned long count = 0; | |
205ab99d | 3928 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
434e245d CL |
3929 | sizeof(unsigned long), GFP_KERNEL); |
3930 | ||
3931 | if (!map) | |
3932 | return -ENOMEM; | |
53e15af0 CL |
3933 | |
3934 | flush_all(s); | |
f64dc58c | 3935 | for_each_node_state(node, N_NORMAL_MEMORY) { |
53e15af0 CL |
3936 | struct kmem_cache_node *n = get_node(s, node); |
3937 | ||
434e245d | 3938 | count += validate_slab_node(s, n, map); |
53e15af0 | 3939 | } |
434e245d | 3940 | kfree(map); |
53e15af0 CL |
3941 | return count; |
3942 | } | |
88a420e4 | 3943 | /* |
672bba3a | 3944 | * Generate lists of code addresses where slabcache objects are allocated |
88a420e4 CL |
3945 | * and freed. |
3946 | */ | |
3947 | ||
3948 | struct location { | |
3949 | unsigned long count; | |
ce71e27c | 3950 | unsigned long addr; |
45edfa58 CL |
3951 | long long sum_time; |
3952 | long min_time; | |
3953 | long max_time; | |
3954 | long min_pid; | |
3955 | long max_pid; | |
174596a0 | 3956 | DECLARE_BITMAP(cpus, NR_CPUS); |
45edfa58 | 3957 | nodemask_t nodes; |
88a420e4 CL |
3958 | }; |
3959 | ||
3960 | struct loc_track { | |
3961 | unsigned long max; | |
3962 | unsigned long count; | |
3963 | struct location *loc; | |
3964 | }; | |
3965 | ||
3966 | static void free_loc_track(struct loc_track *t) | |
3967 | { | |
3968 | if (t->max) | |
3969 | free_pages((unsigned long)t->loc, | |
3970 | get_order(sizeof(struct location) * t->max)); | |
3971 | } | |
3972 | ||
68dff6a9 | 3973 | static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags) |
88a420e4 CL |
3974 | { |
3975 | struct location *l; | |
3976 | int order; | |
3977 | ||
88a420e4 CL |
3978 | order = get_order(sizeof(struct location) * max); |
3979 | ||
68dff6a9 | 3980 | l = (void *)__get_free_pages(flags, order); |
88a420e4 CL |
3981 | if (!l) |
3982 | return 0; | |
3983 | ||
3984 | if (t->count) { | |
3985 | memcpy(l, t->loc, sizeof(struct location) * t->count); | |
3986 | free_loc_track(t); | |
3987 | } | |
3988 | t->max = max; | |
3989 | t->loc = l; | |
3990 | return 1; | |
3991 | } | |
3992 | ||
3993 | static int add_location(struct loc_track *t, struct kmem_cache *s, | |
45edfa58 | 3994 | const struct track *track) |
88a420e4 CL |
3995 | { |
3996 | long start, end, pos; | |
3997 | struct location *l; | |
ce71e27c | 3998 | unsigned long caddr; |
45edfa58 | 3999 | unsigned long age = jiffies - track->when; |
88a420e4 CL |
4000 | |
4001 | start = -1; | |
4002 | end = t->count; | |
4003 | ||
4004 | for ( ; ; ) { | |
4005 | pos = start + (end - start + 1) / 2; | |
4006 | ||
4007 | /* | |
4008 | * There is nothing at "end". If we end up there | |
4009 | * we need to add something to before end. | |
4010 | */ | |
4011 | if (pos == end) | |
4012 | break; | |
4013 | ||
4014 | caddr = t->loc[pos].addr; | |
45edfa58 CL |
4015 | if (track->addr == caddr) { |
4016 | ||
4017 | l = &t->loc[pos]; | |
4018 | l->count++; | |
4019 | if (track->when) { | |
4020 | l->sum_time += age; | |
4021 | if (age < l->min_time) | |
4022 | l->min_time = age; | |
4023 | if (age > l->max_time) | |
4024 | l->max_time = age; | |
4025 | ||
4026 | if (track->pid < l->min_pid) | |
4027 | l->min_pid = track->pid; | |
4028 | if (track->pid > l->max_pid) | |
4029 | l->max_pid = track->pid; | |
4030 | ||
174596a0 RR |
4031 | cpumask_set_cpu(track->cpu, |
4032 | to_cpumask(l->cpus)); | |
45edfa58 CL |
4033 | } |
4034 | node_set(page_to_nid(virt_to_page(track)), l->nodes); | |
88a420e4 CL |
4035 | return 1; |
4036 | } | |
4037 | ||
45edfa58 | 4038 | if (track->addr < caddr) |
88a420e4 CL |
4039 | end = pos; |
4040 | else | |
4041 | start = pos; | |
4042 | } | |
4043 | ||
4044 | /* | |
672bba3a | 4045 | * Not found. Insert new tracking element. |
88a420e4 | 4046 | */ |
68dff6a9 | 4047 | if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max, GFP_ATOMIC)) |
88a420e4 CL |
4048 | return 0; |
4049 | ||
4050 | l = t->loc + pos; | |
4051 | if (pos < t->count) | |
4052 | memmove(l + 1, l, | |
4053 | (t->count - pos) * sizeof(struct location)); | |
4054 | t->count++; | |
4055 | l->count = 1; | |
45edfa58 CL |
4056 | l->addr = track->addr; |
4057 | l->sum_time = age; | |
4058 | l->min_time = age; | |
4059 | l->max_time = age; | |
4060 | l->min_pid = track->pid; | |
4061 | l->max_pid = track->pid; | |
174596a0 RR |
4062 | cpumask_clear(to_cpumask(l->cpus)); |
4063 | cpumask_set_cpu(track->cpu, to_cpumask(l->cpus)); | |
45edfa58 CL |
4064 | nodes_clear(l->nodes); |
4065 | node_set(page_to_nid(virt_to_page(track)), l->nodes); | |
88a420e4 CL |
4066 | return 1; |
4067 | } | |
4068 | ||
4069 | static void process_slab(struct loc_track *t, struct kmem_cache *s, | |
bbd7d57b | 4070 | struct page *page, enum track_item alloc, |
a5dd5c11 | 4071 | unsigned long *map) |
88a420e4 | 4072 | { |
a973e9dd | 4073 | void *addr = page_address(page); |
88a420e4 CL |
4074 | void *p; |
4075 | ||
39b26464 | 4076 | bitmap_zero(map, page->objects); |
5f80b13a | 4077 | get_map(s, page, map); |
88a420e4 | 4078 | |
224a88be | 4079 | for_each_object(p, s, addr, page->objects) |
45edfa58 CL |
4080 | if (!test_bit(slab_index(p, s, addr), map)) |
4081 | add_location(t, s, get_track(s, p, alloc)); | |
88a420e4 CL |
4082 | } |
4083 | ||
4084 | static int list_locations(struct kmem_cache *s, char *buf, | |
4085 | enum track_item alloc) | |
4086 | { | |
e374d483 | 4087 | int len = 0; |
88a420e4 | 4088 | unsigned long i; |
68dff6a9 | 4089 | struct loc_track t = { 0, 0, NULL }; |
88a420e4 | 4090 | int node; |
bbd7d57b ED |
4091 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
4092 | sizeof(unsigned long), GFP_KERNEL); | |
88a420e4 | 4093 | |
bbd7d57b ED |
4094 | if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location), |
4095 | GFP_TEMPORARY)) { | |
4096 | kfree(map); | |
68dff6a9 | 4097 | return sprintf(buf, "Out of memory\n"); |
bbd7d57b | 4098 | } |
88a420e4 CL |
4099 | /* Push back cpu slabs */ |
4100 | flush_all(s); | |
4101 | ||
f64dc58c | 4102 | for_each_node_state(node, N_NORMAL_MEMORY) { |
88a420e4 CL |
4103 | struct kmem_cache_node *n = get_node(s, node); |
4104 | unsigned long flags; | |
4105 | struct page *page; | |
4106 | ||
9e86943b | 4107 | if (!atomic_long_read(&n->nr_slabs)) |
88a420e4 CL |
4108 | continue; |
4109 | ||
4110 | spin_lock_irqsave(&n->list_lock, flags); | |
4111 | list_for_each_entry(page, &n->partial, lru) | |
bbd7d57b | 4112 | process_slab(&t, s, page, alloc, map); |
88a420e4 | 4113 | list_for_each_entry(page, &n->full, lru) |
bbd7d57b | 4114 | process_slab(&t, s, page, alloc, map); |
88a420e4 CL |
4115 | spin_unlock_irqrestore(&n->list_lock, flags); |
4116 | } | |
4117 | ||
4118 | for (i = 0; i < t.count; i++) { | |
45edfa58 | 4119 | struct location *l = &t.loc[i]; |
88a420e4 | 4120 | |
9c246247 | 4121 | if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100) |
88a420e4 | 4122 | break; |
e374d483 | 4123 | len += sprintf(buf + len, "%7ld ", l->count); |
45edfa58 CL |
4124 | |
4125 | if (l->addr) | |
62c70bce | 4126 | len += sprintf(buf + len, "%pS", (void *)l->addr); |
88a420e4 | 4127 | else |
e374d483 | 4128 | len += sprintf(buf + len, "<not-available>"); |
45edfa58 CL |
4129 | |
4130 | if (l->sum_time != l->min_time) { | |
e374d483 | 4131 | len += sprintf(buf + len, " age=%ld/%ld/%ld", |
f8bd2258 RZ |
4132 | l->min_time, |
4133 | (long)div_u64(l->sum_time, l->count), | |
4134 | l->max_time); | |
45edfa58 | 4135 | } else |
e374d483 | 4136 | len += sprintf(buf + len, " age=%ld", |
45edfa58 CL |
4137 | l->min_time); |
4138 | ||
4139 | if (l->min_pid != l->max_pid) | |
e374d483 | 4140 | len += sprintf(buf + len, " pid=%ld-%ld", |
45edfa58 CL |
4141 | l->min_pid, l->max_pid); |
4142 | else | |
e374d483 | 4143 | len += sprintf(buf + len, " pid=%ld", |
45edfa58 CL |
4144 | l->min_pid); |
4145 | ||
174596a0 RR |
4146 | if (num_online_cpus() > 1 && |
4147 | !cpumask_empty(to_cpumask(l->cpus)) && | |
e374d483 HH |
4148 | len < PAGE_SIZE - 60) { |
4149 | len += sprintf(buf + len, " cpus="); | |
4150 | len += cpulist_scnprintf(buf + len, PAGE_SIZE - len - 50, | |
174596a0 | 4151 | to_cpumask(l->cpus)); |
45edfa58 CL |
4152 | } |
4153 | ||
62bc62a8 | 4154 | if (nr_online_nodes > 1 && !nodes_empty(l->nodes) && |
e374d483 HH |
4155 | len < PAGE_SIZE - 60) { |
4156 | len += sprintf(buf + len, " nodes="); | |
4157 | len += nodelist_scnprintf(buf + len, PAGE_SIZE - len - 50, | |
45edfa58 CL |
4158 | l->nodes); |
4159 | } | |
4160 | ||
e374d483 | 4161 | len += sprintf(buf + len, "\n"); |
88a420e4 CL |
4162 | } |
4163 | ||
4164 | free_loc_track(&t); | |
bbd7d57b | 4165 | kfree(map); |
88a420e4 | 4166 | if (!t.count) |
e374d483 HH |
4167 | len += sprintf(buf, "No data\n"); |
4168 | return len; | |
88a420e4 | 4169 | } |
ab4d5ed5 | 4170 | #endif |
88a420e4 | 4171 | |
a5a84755 CL |
4172 | #ifdef SLUB_RESILIENCY_TEST |
4173 | static void resiliency_test(void) | |
4174 | { | |
4175 | u8 *p; | |
4176 | ||
95a05b42 | 4177 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || KMALLOC_SHIFT_HIGH < 10); |
a5a84755 CL |
4178 | |
4179 | printk(KERN_ERR "SLUB resiliency testing\n"); | |
4180 | printk(KERN_ERR "-----------------------\n"); | |
4181 | printk(KERN_ERR "A. Corruption after allocation\n"); | |
4182 | ||
4183 | p = kzalloc(16, GFP_KERNEL); | |
4184 | p[16] = 0x12; | |
4185 | printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer" | |
4186 | " 0x12->0x%p\n\n", p + 16); | |
4187 | ||
4188 | validate_slab_cache(kmalloc_caches[4]); | |
4189 | ||
4190 | /* Hmmm... The next two are dangerous */ | |
4191 | p = kzalloc(32, GFP_KERNEL); | |
4192 | p[32 + sizeof(void *)] = 0x34; | |
4193 | printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab" | |
4194 | " 0x34 -> -0x%p\n", p); | |
4195 | printk(KERN_ERR | |
4196 | "If allocated object is overwritten then not detectable\n\n"); | |
4197 | ||
4198 | validate_slab_cache(kmalloc_caches[5]); | |
4199 | p = kzalloc(64, GFP_KERNEL); | |
4200 | p += 64 + (get_cycles() & 0xff) * sizeof(void *); | |
4201 | *p = 0x56; | |
4202 | printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n", | |
4203 | p); | |
4204 | printk(KERN_ERR | |
4205 | "If allocated object is overwritten then not detectable\n\n"); | |
4206 | validate_slab_cache(kmalloc_caches[6]); | |
4207 | ||
4208 | printk(KERN_ERR "\nB. Corruption after free\n"); | |
4209 | p = kzalloc(128, GFP_KERNEL); | |
4210 | kfree(p); | |
4211 | *p = 0x78; | |
4212 | printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p); | |
4213 | validate_slab_cache(kmalloc_caches[7]); | |
4214 | ||
4215 | p = kzalloc(256, GFP_KERNEL); | |
4216 | kfree(p); | |
4217 | p[50] = 0x9a; | |
4218 | printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", | |
4219 | p); | |
4220 | validate_slab_cache(kmalloc_caches[8]); | |
4221 | ||
4222 | p = kzalloc(512, GFP_KERNEL); | |
4223 | kfree(p); | |
4224 | p[512] = 0xab; | |
4225 | printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p); | |
4226 | validate_slab_cache(kmalloc_caches[9]); | |
4227 | } | |
4228 | #else | |
4229 | #ifdef CONFIG_SYSFS | |
4230 | static void resiliency_test(void) {}; | |
4231 | #endif | |
4232 | #endif | |
4233 | ||
ab4d5ed5 | 4234 | #ifdef CONFIG_SYSFS |
81819f0f | 4235 | enum slab_stat_type { |
205ab99d CL |
4236 | SL_ALL, /* All slabs */ |
4237 | SL_PARTIAL, /* Only partially allocated slabs */ | |
4238 | SL_CPU, /* Only slabs used for cpu caches */ | |
4239 | SL_OBJECTS, /* Determine allocated objects not slabs */ | |
4240 | SL_TOTAL /* Determine object capacity not slabs */ | |
81819f0f CL |
4241 | }; |
4242 | ||
205ab99d | 4243 | #define SO_ALL (1 << SL_ALL) |
81819f0f CL |
4244 | #define SO_PARTIAL (1 << SL_PARTIAL) |
4245 | #define SO_CPU (1 << SL_CPU) | |
4246 | #define SO_OBJECTS (1 << SL_OBJECTS) | |
205ab99d | 4247 | #define SO_TOTAL (1 << SL_TOTAL) |
81819f0f | 4248 | |
62e5c4b4 CG |
4249 | static ssize_t show_slab_objects(struct kmem_cache *s, |
4250 | char *buf, unsigned long flags) | |
81819f0f CL |
4251 | { |
4252 | unsigned long total = 0; | |
81819f0f CL |
4253 | int node; |
4254 | int x; | |
4255 | unsigned long *nodes; | |
4256 | unsigned long *per_cpu; | |
4257 | ||
4258 | nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL); | |
62e5c4b4 CG |
4259 | if (!nodes) |
4260 | return -ENOMEM; | |
81819f0f CL |
4261 | per_cpu = nodes + nr_node_ids; |
4262 | ||
205ab99d CL |
4263 | if (flags & SO_CPU) { |
4264 | int cpu; | |
81819f0f | 4265 | |
205ab99d | 4266 | for_each_possible_cpu(cpu) { |
9dfc6e68 | 4267 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
ec3ab083 | 4268 | int node; |
49e22585 | 4269 | struct page *page; |
dfb4f096 | 4270 | |
bc6697d8 | 4271 | page = ACCESS_ONCE(c->page); |
ec3ab083 CL |
4272 | if (!page) |
4273 | continue; | |
205ab99d | 4274 | |
ec3ab083 CL |
4275 | node = page_to_nid(page); |
4276 | if (flags & SO_TOTAL) | |
4277 | x = page->objects; | |
4278 | else if (flags & SO_OBJECTS) | |
4279 | x = page->inuse; | |
4280 | else | |
4281 | x = 1; | |
49e22585 | 4282 | |
ec3ab083 CL |
4283 | total += x; |
4284 | nodes[node] += x; | |
4285 | ||
4286 | page = ACCESS_ONCE(c->partial); | |
49e22585 CL |
4287 | if (page) { |
4288 | x = page->pobjects; | |
bc6697d8 ED |
4289 | total += x; |
4290 | nodes[node] += x; | |
49e22585 | 4291 | } |
ec3ab083 | 4292 | |
bc6697d8 | 4293 | per_cpu[node]++; |
81819f0f CL |
4294 | } |
4295 | } | |
4296 | ||
04d94879 | 4297 | lock_memory_hotplug(); |
ab4d5ed5 | 4298 | #ifdef CONFIG_SLUB_DEBUG |
205ab99d CL |
4299 | if (flags & SO_ALL) { |
4300 | for_each_node_state(node, N_NORMAL_MEMORY) { | |
4301 | struct kmem_cache_node *n = get_node(s, node); | |
4302 | ||
4303 | if (flags & SO_TOTAL) | |
4304 | x = atomic_long_read(&n->total_objects); | |
4305 | else if (flags & SO_OBJECTS) | |
4306 | x = atomic_long_read(&n->total_objects) - | |
4307 | count_partial(n, count_free); | |
81819f0f | 4308 | |
81819f0f | 4309 | else |
205ab99d | 4310 | x = atomic_long_read(&n->nr_slabs); |
81819f0f CL |
4311 | total += x; |
4312 | nodes[node] += x; | |
4313 | } | |
4314 | ||
ab4d5ed5 CL |
4315 | } else |
4316 | #endif | |
4317 | if (flags & SO_PARTIAL) { | |
205ab99d CL |
4318 | for_each_node_state(node, N_NORMAL_MEMORY) { |
4319 | struct kmem_cache_node *n = get_node(s, node); | |
81819f0f | 4320 | |
205ab99d CL |
4321 | if (flags & SO_TOTAL) |
4322 | x = count_partial(n, count_total); | |
4323 | else if (flags & SO_OBJECTS) | |
4324 | x = count_partial(n, count_inuse); | |
81819f0f | 4325 | else |
205ab99d | 4326 | x = n->nr_partial; |
81819f0f CL |
4327 | total += x; |
4328 | nodes[node] += x; | |
4329 | } | |
4330 | } | |
81819f0f CL |
4331 | x = sprintf(buf, "%lu", total); |
4332 | #ifdef CONFIG_NUMA | |
f64dc58c | 4333 | for_each_node_state(node, N_NORMAL_MEMORY) |
81819f0f CL |
4334 | if (nodes[node]) |
4335 | x += sprintf(buf + x, " N%d=%lu", | |
4336 | node, nodes[node]); | |
4337 | #endif | |
04d94879 | 4338 | unlock_memory_hotplug(); |
81819f0f CL |
4339 | kfree(nodes); |
4340 | return x + sprintf(buf + x, "\n"); | |
4341 | } | |
4342 | ||
ab4d5ed5 | 4343 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f CL |
4344 | static int any_slab_objects(struct kmem_cache *s) |
4345 | { | |
4346 | int node; | |
81819f0f | 4347 | |
dfb4f096 | 4348 | for_each_online_node(node) { |
81819f0f CL |
4349 | struct kmem_cache_node *n = get_node(s, node); |
4350 | ||
dfb4f096 CL |
4351 | if (!n) |
4352 | continue; | |
4353 | ||
4ea33e2d | 4354 | if (atomic_long_read(&n->total_objects)) |
81819f0f CL |
4355 | return 1; |
4356 | } | |
4357 | return 0; | |
4358 | } | |
ab4d5ed5 | 4359 | #endif |
81819f0f CL |
4360 | |
4361 | #define to_slab_attr(n) container_of(n, struct slab_attribute, attr) | |
497888cf | 4362 | #define to_slab(n) container_of(n, struct kmem_cache, kobj) |
81819f0f CL |
4363 | |
4364 | struct slab_attribute { | |
4365 | struct attribute attr; | |
4366 | ssize_t (*show)(struct kmem_cache *s, char *buf); | |
4367 | ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count); | |
4368 | }; | |
4369 | ||
4370 | #define SLAB_ATTR_RO(_name) \ | |
ab067e99 VK |
4371 | static struct slab_attribute _name##_attr = \ |
4372 | __ATTR(_name, 0400, _name##_show, NULL) | |
81819f0f CL |
4373 | |
4374 | #define SLAB_ATTR(_name) \ | |
4375 | static struct slab_attribute _name##_attr = \ | |
ab067e99 | 4376 | __ATTR(_name, 0600, _name##_show, _name##_store) |
81819f0f | 4377 | |
81819f0f CL |
4378 | static ssize_t slab_size_show(struct kmem_cache *s, char *buf) |
4379 | { | |
4380 | return sprintf(buf, "%d\n", s->size); | |
4381 | } | |
4382 | SLAB_ATTR_RO(slab_size); | |
4383 | ||
4384 | static ssize_t align_show(struct kmem_cache *s, char *buf) | |
4385 | { | |
4386 | return sprintf(buf, "%d\n", s->align); | |
4387 | } | |
4388 | SLAB_ATTR_RO(align); | |
4389 | ||
4390 | static ssize_t object_size_show(struct kmem_cache *s, char *buf) | |
4391 | { | |
3b0efdfa | 4392 | return sprintf(buf, "%d\n", s->object_size); |
81819f0f CL |
4393 | } |
4394 | SLAB_ATTR_RO(object_size); | |
4395 | ||
4396 | static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf) | |
4397 | { | |
834f3d11 | 4398 | return sprintf(buf, "%d\n", oo_objects(s->oo)); |
81819f0f CL |
4399 | } |
4400 | SLAB_ATTR_RO(objs_per_slab); | |
4401 | ||
06b285dc CL |
4402 | static ssize_t order_store(struct kmem_cache *s, |
4403 | const char *buf, size_t length) | |
4404 | { | |
0121c619 CL |
4405 | unsigned long order; |
4406 | int err; | |
4407 | ||
4408 | err = strict_strtoul(buf, 10, &order); | |
4409 | if (err) | |
4410 | return err; | |
06b285dc CL |
4411 | |
4412 | if (order > slub_max_order || order < slub_min_order) | |
4413 | return -EINVAL; | |
4414 | ||
4415 | calculate_sizes(s, order); | |
4416 | return length; | |
4417 | } | |
4418 | ||
81819f0f CL |
4419 | static ssize_t order_show(struct kmem_cache *s, char *buf) |
4420 | { | |
834f3d11 | 4421 | return sprintf(buf, "%d\n", oo_order(s->oo)); |
81819f0f | 4422 | } |
06b285dc | 4423 | SLAB_ATTR(order); |
81819f0f | 4424 | |
73d342b1 DR |
4425 | static ssize_t min_partial_show(struct kmem_cache *s, char *buf) |
4426 | { | |
4427 | return sprintf(buf, "%lu\n", s->min_partial); | |
4428 | } | |
4429 | ||
4430 | static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, | |
4431 | size_t length) | |
4432 | { | |
4433 | unsigned long min; | |
4434 | int err; | |
4435 | ||
4436 | err = strict_strtoul(buf, 10, &min); | |
4437 | if (err) | |
4438 | return err; | |
4439 | ||
c0bdb232 | 4440 | set_min_partial(s, min); |
73d342b1 DR |
4441 | return length; |
4442 | } | |
4443 | SLAB_ATTR(min_partial); | |
4444 | ||
49e22585 CL |
4445 | static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf) |
4446 | { | |
4447 | return sprintf(buf, "%u\n", s->cpu_partial); | |
4448 | } | |
4449 | ||
4450 | static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf, | |
4451 | size_t length) | |
4452 | { | |
4453 | unsigned long objects; | |
4454 | int err; | |
4455 | ||
4456 | err = strict_strtoul(buf, 10, &objects); | |
4457 | if (err) | |
4458 | return err; | |
74ee4ef1 DR |
4459 | if (objects && kmem_cache_debug(s)) |
4460 | return -EINVAL; | |
49e22585 CL |
4461 | |
4462 | s->cpu_partial = objects; | |
4463 | flush_all(s); | |
4464 | return length; | |
4465 | } | |
4466 | SLAB_ATTR(cpu_partial); | |
4467 | ||
81819f0f CL |
4468 | static ssize_t ctor_show(struct kmem_cache *s, char *buf) |
4469 | { | |
62c70bce JP |
4470 | if (!s->ctor) |
4471 | return 0; | |
4472 | return sprintf(buf, "%pS\n", s->ctor); | |
81819f0f CL |
4473 | } |
4474 | SLAB_ATTR_RO(ctor); | |
4475 | ||
81819f0f CL |
4476 | static ssize_t aliases_show(struct kmem_cache *s, char *buf) |
4477 | { | |
4478 | return sprintf(buf, "%d\n", s->refcount - 1); | |
4479 | } | |
4480 | SLAB_ATTR_RO(aliases); | |
4481 | ||
81819f0f CL |
4482 | static ssize_t partial_show(struct kmem_cache *s, char *buf) |
4483 | { | |
d9acf4b7 | 4484 | return show_slab_objects(s, buf, SO_PARTIAL); |
81819f0f CL |
4485 | } |
4486 | SLAB_ATTR_RO(partial); | |
4487 | ||
4488 | static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf) | |
4489 | { | |
d9acf4b7 | 4490 | return show_slab_objects(s, buf, SO_CPU); |
81819f0f CL |
4491 | } |
4492 | SLAB_ATTR_RO(cpu_slabs); | |
4493 | ||
4494 | static ssize_t objects_show(struct kmem_cache *s, char *buf) | |
4495 | { | |
205ab99d | 4496 | return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS); |
81819f0f CL |
4497 | } |
4498 | SLAB_ATTR_RO(objects); | |
4499 | ||
205ab99d CL |
4500 | static ssize_t objects_partial_show(struct kmem_cache *s, char *buf) |
4501 | { | |
4502 | return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS); | |
4503 | } | |
4504 | SLAB_ATTR_RO(objects_partial); | |
4505 | ||
49e22585 CL |
4506 | static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) |
4507 | { | |
4508 | int objects = 0; | |
4509 | int pages = 0; | |
4510 | int cpu; | |
4511 | int len; | |
4512 | ||
4513 | for_each_online_cpu(cpu) { | |
4514 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu)->partial; | |
4515 | ||
4516 | if (page) { | |
4517 | pages += page->pages; | |
4518 | objects += page->pobjects; | |
4519 | } | |
4520 | } | |
4521 | ||
4522 | len = sprintf(buf, "%d(%d)", objects, pages); | |
4523 | ||
4524 | #ifdef CONFIG_SMP | |
4525 | for_each_online_cpu(cpu) { | |
4526 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu) ->partial; | |
4527 | ||
4528 | if (page && len < PAGE_SIZE - 20) | |
4529 | len += sprintf(buf + len, " C%d=%d(%d)", cpu, | |
4530 | page->pobjects, page->pages); | |
4531 | } | |
4532 | #endif | |
4533 | return len + sprintf(buf + len, "\n"); | |
4534 | } | |
4535 | SLAB_ATTR_RO(slabs_cpu_partial); | |
4536 | ||
a5a84755 CL |
4537 | static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf) |
4538 | { | |
4539 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT)); | |
4540 | } | |
4541 | ||
4542 | static ssize_t reclaim_account_store(struct kmem_cache *s, | |
4543 | const char *buf, size_t length) | |
4544 | { | |
4545 | s->flags &= ~SLAB_RECLAIM_ACCOUNT; | |
4546 | if (buf[0] == '1') | |
4547 | s->flags |= SLAB_RECLAIM_ACCOUNT; | |
4548 | return length; | |
4549 | } | |
4550 | SLAB_ATTR(reclaim_account); | |
4551 | ||
4552 | static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf) | |
4553 | { | |
4554 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN)); | |
4555 | } | |
4556 | SLAB_ATTR_RO(hwcache_align); | |
4557 | ||
4558 | #ifdef CONFIG_ZONE_DMA | |
4559 | static ssize_t cache_dma_show(struct kmem_cache *s, char *buf) | |
4560 | { | |
4561 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA)); | |
4562 | } | |
4563 | SLAB_ATTR_RO(cache_dma); | |
4564 | #endif | |
4565 | ||
4566 | static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf) | |
4567 | { | |
4568 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU)); | |
4569 | } | |
4570 | SLAB_ATTR_RO(destroy_by_rcu); | |
4571 | ||
ab9a0f19 LJ |
4572 | static ssize_t reserved_show(struct kmem_cache *s, char *buf) |
4573 | { | |
4574 | return sprintf(buf, "%d\n", s->reserved); | |
4575 | } | |
4576 | SLAB_ATTR_RO(reserved); | |
4577 | ||
ab4d5ed5 | 4578 | #ifdef CONFIG_SLUB_DEBUG |
a5a84755 CL |
4579 | static ssize_t slabs_show(struct kmem_cache *s, char *buf) |
4580 | { | |
4581 | return show_slab_objects(s, buf, SO_ALL); | |
4582 | } | |
4583 | SLAB_ATTR_RO(slabs); | |
4584 | ||
205ab99d CL |
4585 | static ssize_t total_objects_show(struct kmem_cache *s, char *buf) |
4586 | { | |
4587 | return show_slab_objects(s, buf, SO_ALL|SO_TOTAL); | |
4588 | } | |
4589 | SLAB_ATTR_RO(total_objects); | |
4590 | ||
81819f0f CL |
4591 | static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf) |
4592 | { | |
4593 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DEBUG_FREE)); | |
4594 | } | |
4595 | ||
4596 | static ssize_t sanity_checks_store(struct kmem_cache *s, | |
4597 | const char *buf, size_t length) | |
4598 | { | |
4599 | s->flags &= ~SLAB_DEBUG_FREE; | |
b789ef51 CL |
4600 | if (buf[0] == '1') { |
4601 | s->flags &= ~__CMPXCHG_DOUBLE; | |
81819f0f | 4602 | s->flags |= SLAB_DEBUG_FREE; |
b789ef51 | 4603 | } |
81819f0f CL |
4604 | return length; |
4605 | } | |
4606 | SLAB_ATTR(sanity_checks); | |
4607 | ||
4608 | static ssize_t trace_show(struct kmem_cache *s, char *buf) | |
4609 | { | |
4610 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE)); | |
4611 | } | |
4612 | ||
4613 | static ssize_t trace_store(struct kmem_cache *s, const char *buf, | |
4614 | size_t length) | |
4615 | { | |
4616 | s->flags &= ~SLAB_TRACE; | |
b789ef51 CL |
4617 | if (buf[0] == '1') { |
4618 | s->flags &= ~__CMPXCHG_DOUBLE; | |
81819f0f | 4619 | s->flags |= SLAB_TRACE; |
b789ef51 | 4620 | } |
81819f0f CL |
4621 | return length; |
4622 | } | |
4623 | SLAB_ATTR(trace); | |
4624 | ||
81819f0f CL |
4625 | static ssize_t red_zone_show(struct kmem_cache *s, char *buf) |
4626 | { | |
4627 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE)); | |
4628 | } | |
4629 | ||
4630 | static ssize_t red_zone_store(struct kmem_cache *s, | |
4631 | const char *buf, size_t length) | |
4632 | { | |
4633 | if (any_slab_objects(s)) | |
4634 | return -EBUSY; | |
4635 | ||
4636 | s->flags &= ~SLAB_RED_ZONE; | |
b789ef51 CL |
4637 | if (buf[0] == '1') { |
4638 | s->flags &= ~__CMPXCHG_DOUBLE; | |
81819f0f | 4639 | s->flags |= SLAB_RED_ZONE; |
b789ef51 | 4640 | } |
06b285dc | 4641 | calculate_sizes(s, -1); |
81819f0f CL |
4642 | return length; |
4643 | } | |
4644 | SLAB_ATTR(red_zone); | |
4645 | ||
4646 | static ssize_t poison_show(struct kmem_cache *s, char *buf) | |
4647 | { | |
4648 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON)); | |
4649 | } | |
4650 | ||
4651 | static ssize_t poison_store(struct kmem_cache *s, | |
4652 | const char *buf, size_t length) | |
4653 | { | |
4654 | if (any_slab_objects(s)) | |
4655 | return -EBUSY; | |
4656 | ||
4657 | s->flags &= ~SLAB_POISON; | |
b789ef51 CL |
4658 | if (buf[0] == '1') { |
4659 | s->flags &= ~__CMPXCHG_DOUBLE; | |
81819f0f | 4660 | s->flags |= SLAB_POISON; |
b789ef51 | 4661 | } |
06b285dc | 4662 | calculate_sizes(s, -1); |
81819f0f CL |
4663 | return length; |
4664 | } | |
4665 | SLAB_ATTR(poison); | |
4666 | ||
4667 | static ssize_t store_user_show(struct kmem_cache *s, char *buf) | |
4668 | { | |
4669 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER)); | |
4670 | } | |
4671 | ||
4672 | static ssize_t store_user_store(struct kmem_cache *s, | |
4673 | const char *buf, size_t length) | |
4674 | { | |
4675 | if (any_slab_objects(s)) | |
4676 | return -EBUSY; | |
4677 | ||
4678 | s->flags &= ~SLAB_STORE_USER; | |
b789ef51 CL |
4679 | if (buf[0] == '1') { |
4680 | s->flags &= ~__CMPXCHG_DOUBLE; | |
81819f0f | 4681 | s->flags |= SLAB_STORE_USER; |
b789ef51 | 4682 | } |
06b285dc | 4683 | calculate_sizes(s, -1); |
81819f0f CL |
4684 | return length; |
4685 | } | |
4686 | SLAB_ATTR(store_user); | |
4687 | ||
53e15af0 CL |
4688 | static ssize_t validate_show(struct kmem_cache *s, char *buf) |
4689 | { | |
4690 | return 0; | |
4691 | } | |
4692 | ||
4693 | static ssize_t validate_store(struct kmem_cache *s, | |
4694 | const char *buf, size_t length) | |
4695 | { | |
434e245d CL |
4696 | int ret = -EINVAL; |
4697 | ||
4698 | if (buf[0] == '1') { | |
4699 | ret = validate_slab_cache(s); | |
4700 | if (ret >= 0) | |
4701 | ret = length; | |
4702 | } | |
4703 | return ret; | |
53e15af0 CL |
4704 | } |
4705 | SLAB_ATTR(validate); | |
a5a84755 CL |
4706 | |
4707 | static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf) | |
4708 | { | |
4709 | if (!(s->flags & SLAB_STORE_USER)) | |
4710 | return -ENOSYS; | |
4711 | return list_locations(s, buf, TRACK_ALLOC); | |
4712 | } | |
4713 | SLAB_ATTR_RO(alloc_calls); | |
4714 | ||
4715 | static ssize_t free_calls_show(struct kmem_cache *s, char *buf) | |
4716 | { | |
4717 | if (!(s->flags & SLAB_STORE_USER)) | |
4718 | return -ENOSYS; | |
4719 | return list_locations(s, buf, TRACK_FREE); | |
4720 | } | |
4721 | SLAB_ATTR_RO(free_calls); | |
4722 | #endif /* CONFIG_SLUB_DEBUG */ | |
4723 | ||
4724 | #ifdef CONFIG_FAILSLAB | |
4725 | static ssize_t failslab_show(struct kmem_cache *s, char *buf) | |
4726 | { | |
4727 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB)); | |
4728 | } | |
4729 | ||
4730 | static ssize_t failslab_store(struct kmem_cache *s, const char *buf, | |
4731 | size_t length) | |
4732 | { | |
4733 | s->flags &= ~SLAB_FAILSLAB; | |
4734 | if (buf[0] == '1') | |
4735 | s->flags |= SLAB_FAILSLAB; | |
4736 | return length; | |
4737 | } | |
4738 | SLAB_ATTR(failslab); | |
ab4d5ed5 | 4739 | #endif |
53e15af0 | 4740 | |
2086d26a CL |
4741 | static ssize_t shrink_show(struct kmem_cache *s, char *buf) |
4742 | { | |
4743 | return 0; | |
4744 | } | |
4745 | ||
4746 | static ssize_t shrink_store(struct kmem_cache *s, | |
4747 | const char *buf, size_t length) | |
4748 | { | |
4749 | if (buf[0] == '1') { | |
4750 | int rc = kmem_cache_shrink(s); | |
4751 | ||
4752 | if (rc) | |
4753 | return rc; | |
4754 | } else | |
4755 | return -EINVAL; | |
4756 | return length; | |
4757 | } | |
4758 | SLAB_ATTR(shrink); | |
4759 | ||
81819f0f | 4760 | #ifdef CONFIG_NUMA |
9824601e | 4761 | static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf) |
81819f0f | 4762 | { |
9824601e | 4763 | return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10); |
81819f0f CL |
4764 | } |
4765 | ||
9824601e | 4766 | static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, |
81819f0f CL |
4767 | const char *buf, size_t length) |
4768 | { | |
0121c619 CL |
4769 | unsigned long ratio; |
4770 | int err; | |
4771 | ||
4772 | err = strict_strtoul(buf, 10, &ratio); | |
4773 | if (err) | |
4774 | return err; | |
4775 | ||
e2cb96b7 | 4776 | if (ratio <= 100) |
0121c619 | 4777 | s->remote_node_defrag_ratio = ratio * 10; |
81819f0f | 4778 | |
81819f0f CL |
4779 | return length; |
4780 | } | |
9824601e | 4781 | SLAB_ATTR(remote_node_defrag_ratio); |
81819f0f CL |
4782 | #endif |
4783 | ||
8ff12cfc | 4784 | #ifdef CONFIG_SLUB_STATS |
8ff12cfc CL |
4785 | static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) |
4786 | { | |
4787 | unsigned long sum = 0; | |
4788 | int cpu; | |
4789 | int len; | |
4790 | int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL); | |
4791 | ||
4792 | if (!data) | |
4793 | return -ENOMEM; | |
4794 | ||
4795 | for_each_online_cpu(cpu) { | |
9dfc6e68 | 4796 | unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; |
8ff12cfc CL |
4797 | |
4798 | data[cpu] = x; | |
4799 | sum += x; | |
4800 | } | |
4801 | ||
4802 | len = sprintf(buf, "%lu", sum); | |
4803 | ||
50ef37b9 | 4804 | #ifdef CONFIG_SMP |
8ff12cfc CL |
4805 | for_each_online_cpu(cpu) { |
4806 | if (data[cpu] && len < PAGE_SIZE - 20) | |
50ef37b9 | 4807 | len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); |
8ff12cfc | 4808 | } |
50ef37b9 | 4809 | #endif |
8ff12cfc CL |
4810 | kfree(data); |
4811 | return len + sprintf(buf + len, "\n"); | |
4812 | } | |
4813 | ||
78eb00cc DR |
4814 | static void clear_stat(struct kmem_cache *s, enum stat_item si) |
4815 | { | |
4816 | int cpu; | |
4817 | ||
4818 | for_each_online_cpu(cpu) | |
9dfc6e68 | 4819 | per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; |
78eb00cc DR |
4820 | } |
4821 | ||
8ff12cfc CL |
4822 | #define STAT_ATTR(si, text) \ |
4823 | static ssize_t text##_show(struct kmem_cache *s, char *buf) \ | |
4824 | { \ | |
4825 | return show_stat(s, buf, si); \ | |
4826 | } \ | |
78eb00cc DR |
4827 | static ssize_t text##_store(struct kmem_cache *s, \ |
4828 | const char *buf, size_t length) \ | |
4829 | { \ | |
4830 | if (buf[0] != '0') \ | |
4831 | return -EINVAL; \ | |
4832 | clear_stat(s, si); \ | |
4833 | return length; \ | |
4834 | } \ | |
4835 | SLAB_ATTR(text); \ | |
8ff12cfc CL |
4836 | |
4837 | STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); | |
4838 | STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); | |
4839 | STAT_ATTR(FREE_FASTPATH, free_fastpath); | |
4840 | STAT_ATTR(FREE_SLOWPATH, free_slowpath); | |
4841 | STAT_ATTR(FREE_FROZEN, free_frozen); | |
4842 | STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); | |
4843 | STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); | |
4844 | STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); | |
4845 | STAT_ATTR(ALLOC_SLAB, alloc_slab); | |
4846 | STAT_ATTR(ALLOC_REFILL, alloc_refill); | |
e36a2652 | 4847 | STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch); |
8ff12cfc CL |
4848 | STAT_ATTR(FREE_SLAB, free_slab); |
4849 | STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); | |
4850 | STAT_ATTR(DEACTIVATE_FULL, deactivate_full); | |
4851 | STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); | |
4852 | STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); | |
4853 | STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); | |
4854 | STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); | |
03e404af | 4855 | STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass); |
65c3376a | 4856 | STAT_ATTR(ORDER_FALLBACK, order_fallback); |
b789ef51 CL |
4857 | STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail); |
4858 | STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail); | |
49e22585 CL |
4859 | STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc); |
4860 | STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free); | |
8028dcea AS |
4861 | STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node); |
4862 | STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain); | |
8ff12cfc CL |
4863 | #endif |
4864 | ||
06428780 | 4865 | static struct attribute *slab_attrs[] = { |
81819f0f CL |
4866 | &slab_size_attr.attr, |
4867 | &object_size_attr.attr, | |
4868 | &objs_per_slab_attr.attr, | |
4869 | &order_attr.attr, | |
73d342b1 | 4870 | &min_partial_attr.attr, |
49e22585 | 4871 | &cpu_partial_attr.attr, |
81819f0f | 4872 | &objects_attr.attr, |
205ab99d | 4873 | &objects_partial_attr.attr, |
81819f0f CL |
4874 | &partial_attr.attr, |
4875 | &cpu_slabs_attr.attr, | |
4876 | &ctor_attr.attr, | |
81819f0f CL |
4877 | &aliases_attr.attr, |
4878 | &align_attr.attr, | |
81819f0f CL |
4879 | &hwcache_align_attr.attr, |
4880 | &reclaim_account_attr.attr, | |
4881 | &destroy_by_rcu_attr.attr, | |
a5a84755 | 4882 | &shrink_attr.attr, |
ab9a0f19 | 4883 | &reserved_attr.attr, |
49e22585 | 4884 | &slabs_cpu_partial_attr.attr, |
ab4d5ed5 | 4885 | #ifdef CONFIG_SLUB_DEBUG |
a5a84755 CL |
4886 | &total_objects_attr.attr, |
4887 | &slabs_attr.attr, | |
4888 | &sanity_checks_attr.attr, | |
4889 | &trace_attr.attr, | |
81819f0f CL |
4890 | &red_zone_attr.attr, |
4891 | &poison_attr.attr, | |
4892 | &store_user_attr.attr, | |
53e15af0 | 4893 | &validate_attr.attr, |
88a420e4 CL |
4894 | &alloc_calls_attr.attr, |
4895 | &free_calls_attr.attr, | |
ab4d5ed5 | 4896 | #endif |
81819f0f CL |
4897 | #ifdef CONFIG_ZONE_DMA |
4898 | &cache_dma_attr.attr, | |
4899 | #endif | |
4900 | #ifdef CONFIG_NUMA | |
9824601e | 4901 | &remote_node_defrag_ratio_attr.attr, |
8ff12cfc CL |
4902 | #endif |
4903 | #ifdef CONFIG_SLUB_STATS | |
4904 | &alloc_fastpath_attr.attr, | |
4905 | &alloc_slowpath_attr.attr, | |
4906 | &free_fastpath_attr.attr, | |
4907 | &free_slowpath_attr.attr, | |
4908 | &free_frozen_attr.attr, | |
4909 | &free_add_partial_attr.attr, | |
4910 | &free_remove_partial_attr.attr, | |
4911 | &alloc_from_partial_attr.attr, | |
4912 | &alloc_slab_attr.attr, | |
4913 | &alloc_refill_attr.attr, | |
e36a2652 | 4914 | &alloc_node_mismatch_attr.attr, |
8ff12cfc CL |
4915 | &free_slab_attr.attr, |
4916 | &cpuslab_flush_attr.attr, | |
4917 | &deactivate_full_attr.attr, | |
4918 | &deactivate_empty_attr.attr, | |
4919 | &deactivate_to_head_attr.attr, | |
4920 | &deactivate_to_tail_attr.attr, | |
4921 | &deactivate_remote_frees_attr.attr, | |
03e404af | 4922 | &deactivate_bypass_attr.attr, |
65c3376a | 4923 | &order_fallback_attr.attr, |
b789ef51 CL |
4924 | &cmpxchg_double_fail_attr.attr, |
4925 | &cmpxchg_double_cpu_fail_attr.attr, | |
49e22585 CL |
4926 | &cpu_partial_alloc_attr.attr, |
4927 | &cpu_partial_free_attr.attr, | |
8028dcea AS |
4928 | &cpu_partial_node_attr.attr, |
4929 | &cpu_partial_drain_attr.attr, | |
81819f0f | 4930 | #endif |
4c13dd3b DM |
4931 | #ifdef CONFIG_FAILSLAB |
4932 | &failslab_attr.attr, | |
4933 | #endif | |
4934 | ||
81819f0f CL |
4935 | NULL |
4936 | }; | |
4937 | ||
4938 | static struct attribute_group slab_attr_group = { | |
4939 | .attrs = slab_attrs, | |
4940 | }; | |
4941 | ||
4942 | static ssize_t slab_attr_show(struct kobject *kobj, | |
4943 | struct attribute *attr, | |
4944 | char *buf) | |
4945 | { | |
4946 | struct slab_attribute *attribute; | |
4947 | struct kmem_cache *s; | |
4948 | int err; | |
4949 | ||
4950 | attribute = to_slab_attr(attr); | |
4951 | s = to_slab(kobj); | |
4952 | ||
4953 | if (!attribute->show) | |
4954 | return -EIO; | |
4955 | ||
4956 | err = attribute->show(s, buf); | |
4957 | ||
4958 | return err; | |
4959 | } | |
4960 | ||
4961 | static ssize_t slab_attr_store(struct kobject *kobj, | |
4962 | struct attribute *attr, | |
4963 | const char *buf, size_t len) | |
4964 | { | |
4965 | struct slab_attribute *attribute; | |
4966 | struct kmem_cache *s; | |
4967 | int err; | |
4968 | ||
4969 | attribute = to_slab_attr(attr); | |
4970 | s = to_slab(kobj); | |
4971 | ||
4972 | if (!attribute->store) | |
4973 | return -EIO; | |
4974 | ||
4975 | err = attribute->store(s, buf, len); | |
107dab5c GC |
4976 | #ifdef CONFIG_MEMCG_KMEM |
4977 | if (slab_state >= FULL && err >= 0 && is_root_cache(s)) { | |
4978 | int i; | |
81819f0f | 4979 | |
107dab5c GC |
4980 | mutex_lock(&slab_mutex); |
4981 | if (s->max_attr_size < len) | |
4982 | s->max_attr_size = len; | |
4983 | ||
ebe945c2 GC |
4984 | /* |
4985 | * This is a best effort propagation, so this function's return | |
4986 | * value will be determined by the parent cache only. This is | |
4987 | * basically because not all attributes will have a well | |
4988 | * defined semantics for rollbacks - most of the actions will | |
4989 | * have permanent effects. | |
4990 | * | |
4991 | * Returning the error value of any of the children that fail | |
4992 | * is not 100 % defined, in the sense that users seeing the | |
4993 | * error code won't be able to know anything about the state of | |
4994 | * the cache. | |
4995 | * | |
4996 | * Only returning the error code for the parent cache at least | |
4997 | * has well defined semantics. The cache being written to | |
4998 | * directly either failed or succeeded, in which case we loop | |
4999 | * through the descendants with best-effort propagation. | |
5000 | */ | |
107dab5c GC |
5001 | for_each_memcg_cache_index(i) { |
5002 | struct kmem_cache *c = cache_from_memcg(s, i); | |
107dab5c GC |
5003 | if (c) |
5004 | attribute->store(c, buf, len); | |
5005 | } | |
5006 | mutex_unlock(&slab_mutex); | |
5007 | } | |
5008 | #endif | |
81819f0f CL |
5009 | return err; |
5010 | } | |
5011 | ||
107dab5c GC |
5012 | static void memcg_propagate_slab_attrs(struct kmem_cache *s) |
5013 | { | |
5014 | #ifdef CONFIG_MEMCG_KMEM | |
5015 | int i; | |
5016 | char *buffer = NULL; | |
5017 | ||
5018 | if (!is_root_cache(s)) | |
5019 | return; | |
5020 | ||
5021 | /* | |
5022 | * This mean this cache had no attribute written. Therefore, no point | |
5023 | * in copying default values around | |
5024 | */ | |
5025 | if (!s->max_attr_size) | |
5026 | return; | |
5027 | ||
5028 | for (i = 0; i < ARRAY_SIZE(slab_attrs); i++) { | |
5029 | char mbuf[64]; | |
5030 | char *buf; | |
5031 | struct slab_attribute *attr = to_slab_attr(slab_attrs[i]); | |
5032 | ||
5033 | if (!attr || !attr->store || !attr->show) | |
5034 | continue; | |
5035 | ||
5036 | /* | |
5037 | * It is really bad that we have to allocate here, so we will | |
5038 | * do it only as a fallback. If we actually allocate, though, | |
5039 | * we can just use the allocated buffer until the end. | |
5040 | * | |
5041 | * Most of the slub attributes will tend to be very small in | |
5042 | * size, but sysfs allows buffers up to a page, so they can | |
5043 | * theoretically happen. | |
5044 | */ | |
5045 | if (buffer) | |
5046 | buf = buffer; | |
5047 | else if (s->max_attr_size < ARRAY_SIZE(mbuf)) | |
5048 | buf = mbuf; | |
5049 | else { | |
5050 | buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
5051 | if (WARN_ON(!buffer)) | |
5052 | continue; | |
5053 | buf = buffer; | |
5054 | } | |
5055 | ||
5056 | attr->show(s->memcg_params->root_cache, buf); | |
5057 | attr->store(s, buf, strlen(buf)); | |
5058 | } | |
5059 | ||
5060 | if (buffer) | |
5061 | free_page((unsigned long)buffer); | |
5062 | #endif | |
5063 | } | |
5064 | ||
52cf25d0 | 5065 | static const struct sysfs_ops slab_sysfs_ops = { |
81819f0f CL |
5066 | .show = slab_attr_show, |
5067 | .store = slab_attr_store, | |
5068 | }; | |
5069 | ||
5070 | static struct kobj_type slab_ktype = { | |
5071 | .sysfs_ops = &slab_sysfs_ops, | |
5072 | }; | |
5073 | ||
5074 | static int uevent_filter(struct kset *kset, struct kobject *kobj) | |
5075 | { | |
5076 | struct kobj_type *ktype = get_ktype(kobj); | |
5077 | ||
5078 | if (ktype == &slab_ktype) | |
5079 | return 1; | |
5080 | return 0; | |
5081 | } | |
5082 | ||
9cd43611 | 5083 | static const struct kset_uevent_ops slab_uevent_ops = { |
81819f0f CL |
5084 | .filter = uevent_filter, |
5085 | }; | |
5086 | ||
27c3a314 | 5087 | static struct kset *slab_kset; |
81819f0f CL |
5088 | |
5089 | #define ID_STR_LENGTH 64 | |
5090 | ||
5091 | /* Create a unique string id for a slab cache: | |
6446faa2 CL |
5092 | * |
5093 | * Format :[flags-]size | |
81819f0f CL |
5094 | */ |
5095 | static char *create_unique_id(struct kmem_cache *s) | |
5096 | { | |
5097 | char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL); | |
5098 | char *p = name; | |
5099 | ||
5100 | BUG_ON(!name); | |
5101 | ||
5102 | *p++ = ':'; | |
5103 | /* | |
5104 | * First flags affecting slabcache operations. We will only | |
5105 | * get here for aliasable slabs so we do not need to support | |
5106 | * too many flags. The flags here must cover all flags that | |
5107 | * are matched during merging to guarantee that the id is | |
5108 | * unique. | |
5109 | */ | |
5110 | if (s->flags & SLAB_CACHE_DMA) | |
5111 | *p++ = 'd'; | |
5112 | if (s->flags & SLAB_RECLAIM_ACCOUNT) | |
5113 | *p++ = 'a'; | |
5114 | if (s->flags & SLAB_DEBUG_FREE) | |
5115 | *p++ = 'F'; | |
5a896d9e VN |
5116 | if (!(s->flags & SLAB_NOTRACK)) |
5117 | *p++ = 't'; | |
81819f0f CL |
5118 | if (p != name + 1) |
5119 | *p++ = '-'; | |
5120 | p += sprintf(p, "%07d", s->size); | |
2633d7a0 GC |
5121 | |
5122 | #ifdef CONFIG_MEMCG_KMEM | |
5123 | if (!is_root_cache(s)) | |
5124 | p += sprintf(p, "-%08d", memcg_cache_id(s->memcg_params->memcg)); | |
5125 | #endif | |
5126 | ||
81819f0f CL |
5127 | BUG_ON(p > name + ID_STR_LENGTH - 1); |
5128 | return name; | |
5129 | } | |
5130 | ||
5131 | static int sysfs_slab_add(struct kmem_cache *s) | |
5132 | { | |
5133 | int err; | |
5134 | const char *name; | |
45530c44 | 5135 | int unmergeable = slab_unmergeable(s); |
81819f0f | 5136 | |
81819f0f CL |
5137 | if (unmergeable) { |
5138 | /* | |
5139 | * Slabcache can never be merged so we can use the name proper. | |
5140 | * This is typically the case for debug situations. In that | |
5141 | * case we can catch duplicate names easily. | |
5142 | */ | |
27c3a314 | 5143 | sysfs_remove_link(&slab_kset->kobj, s->name); |
81819f0f CL |
5144 | name = s->name; |
5145 | } else { | |
5146 | /* | |
5147 | * Create a unique name for the slab as a target | |
5148 | * for the symlinks. | |
5149 | */ | |
5150 | name = create_unique_id(s); | |
5151 | } | |
5152 | ||
27c3a314 | 5153 | s->kobj.kset = slab_kset; |
1eada11c GKH |
5154 | err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, name); |
5155 | if (err) { | |
5156 | kobject_put(&s->kobj); | |
81819f0f | 5157 | return err; |
1eada11c | 5158 | } |
81819f0f CL |
5159 | |
5160 | err = sysfs_create_group(&s->kobj, &slab_attr_group); | |
5788d8ad XF |
5161 | if (err) { |
5162 | kobject_del(&s->kobj); | |
5163 | kobject_put(&s->kobj); | |
81819f0f | 5164 | return err; |
5788d8ad | 5165 | } |
81819f0f CL |
5166 | kobject_uevent(&s->kobj, KOBJ_ADD); |
5167 | if (!unmergeable) { | |
5168 | /* Setup first alias */ | |
5169 | sysfs_slab_alias(s, s->name); | |
5170 | kfree(name); | |
5171 | } | |
5172 | return 0; | |
5173 | } | |
5174 | ||
5175 | static void sysfs_slab_remove(struct kmem_cache *s) | |
5176 | { | |
97d06609 | 5177 | if (slab_state < FULL) |
2bce6485 CL |
5178 | /* |
5179 | * Sysfs has not been setup yet so no need to remove the | |
5180 | * cache from sysfs. | |
5181 | */ | |
5182 | return; | |
5183 | ||
81819f0f CL |
5184 | kobject_uevent(&s->kobj, KOBJ_REMOVE); |
5185 | kobject_del(&s->kobj); | |
151c602f | 5186 | kobject_put(&s->kobj); |
81819f0f CL |
5187 | } |
5188 | ||
5189 | /* | |
5190 | * Need to buffer aliases during bootup until sysfs becomes | |
9f6c708e | 5191 | * available lest we lose that information. |
81819f0f CL |
5192 | */ |
5193 | struct saved_alias { | |
5194 | struct kmem_cache *s; | |
5195 | const char *name; | |
5196 | struct saved_alias *next; | |
5197 | }; | |
5198 | ||
5af328a5 | 5199 | static struct saved_alias *alias_list; |
81819f0f CL |
5200 | |
5201 | static int sysfs_slab_alias(struct kmem_cache *s, const char *name) | |
5202 | { | |
5203 | struct saved_alias *al; | |
5204 | ||
97d06609 | 5205 | if (slab_state == FULL) { |
81819f0f CL |
5206 | /* |
5207 | * If we have a leftover link then remove it. | |
5208 | */ | |
27c3a314 GKH |
5209 | sysfs_remove_link(&slab_kset->kobj, name); |
5210 | return sysfs_create_link(&slab_kset->kobj, &s->kobj, name); | |
81819f0f CL |
5211 | } |
5212 | ||
5213 | al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); | |
5214 | if (!al) | |
5215 | return -ENOMEM; | |
5216 | ||
5217 | al->s = s; | |
5218 | al->name = name; | |
5219 | al->next = alias_list; | |
5220 | alias_list = al; | |
5221 | return 0; | |
5222 | } | |
5223 | ||
5224 | static int __init slab_sysfs_init(void) | |
5225 | { | |
5b95a4ac | 5226 | struct kmem_cache *s; |
81819f0f CL |
5227 | int err; |
5228 | ||
18004c5d | 5229 | mutex_lock(&slab_mutex); |
2bce6485 | 5230 | |
0ff21e46 | 5231 | slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj); |
27c3a314 | 5232 | if (!slab_kset) { |
18004c5d | 5233 | mutex_unlock(&slab_mutex); |
81819f0f CL |
5234 | printk(KERN_ERR "Cannot register slab subsystem.\n"); |
5235 | return -ENOSYS; | |
5236 | } | |
5237 | ||
97d06609 | 5238 | slab_state = FULL; |
26a7bd03 | 5239 | |
5b95a4ac | 5240 | list_for_each_entry(s, &slab_caches, list) { |
26a7bd03 | 5241 | err = sysfs_slab_add(s); |
5d540fb7 CL |
5242 | if (err) |
5243 | printk(KERN_ERR "SLUB: Unable to add boot slab %s" | |
5244 | " to sysfs\n", s->name); | |
26a7bd03 | 5245 | } |
81819f0f CL |
5246 | |
5247 | while (alias_list) { | |
5248 | struct saved_alias *al = alias_list; | |
5249 | ||
5250 | alias_list = alias_list->next; | |
5251 | err = sysfs_slab_alias(al->s, al->name); | |
5d540fb7 CL |
5252 | if (err) |
5253 | printk(KERN_ERR "SLUB: Unable to add boot slab alias" | |
068ce415 | 5254 | " %s to sysfs\n", al->name); |
81819f0f CL |
5255 | kfree(al); |
5256 | } | |
5257 | ||
18004c5d | 5258 | mutex_unlock(&slab_mutex); |
81819f0f CL |
5259 | resiliency_test(); |
5260 | return 0; | |
5261 | } | |
5262 | ||
5263 | __initcall(slab_sysfs_init); | |
ab4d5ed5 | 5264 | #endif /* CONFIG_SYSFS */ |
57ed3eda PE |
5265 | |
5266 | /* | |
5267 | * The /proc/slabinfo ABI | |
5268 | */ | |
158a9624 | 5269 | #ifdef CONFIG_SLABINFO |
0d7561c6 | 5270 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo) |
57ed3eda PE |
5271 | { |
5272 | unsigned long nr_partials = 0; | |
5273 | unsigned long nr_slabs = 0; | |
205ab99d CL |
5274 | unsigned long nr_objs = 0; |
5275 | unsigned long nr_free = 0; | |
57ed3eda PE |
5276 | int node; |
5277 | ||
57ed3eda PE |
5278 | for_each_online_node(node) { |
5279 | struct kmem_cache_node *n = get_node(s, node); | |
5280 | ||
5281 | if (!n) | |
5282 | continue; | |
5283 | ||
5284 | nr_partials += n->nr_partial; | |
5285 | nr_slabs += atomic_long_read(&n->nr_slabs); | |
205ab99d CL |
5286 | nr_objs += atomic_long_read(&n->total_objects); |
5287 | nr_free += count_partial(n, count_free); | |
57ed3eda PE |
5288 | } |
5289 | ||
0d7561c6 GC |
5290 | sinfo->active_objs = nr_objs - nr_free; |
5291 | sinfo->num_objs = nr_objs; | |
5292 | sinfo->active_slabs = nr_slabs; | |
5293 | sinfo->num_slabs = nr_slabs; | |
5294 | sinfo->objects_per_slab = oo_objects(s->oo); | |
5295 | sinfo->cache_order = oo_order(s->oo); | |
57ed3eda PE |
5296 | } |
5297 | ||
0d7561c6 | 5298 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s) |
7b3c3a50 | 5299 | { |
7b3c3a50 AD |
5300 | } |
5301 | ||
b7454ad3 GC |
5302 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
5303 | size_t count, loff_t *ppos) | |
7b3c3a50 | 5304 | { |
b7454ad3 | 5305 | return -EIO; |
7b3c3a50 | 5306 | } |
158a9624 | 5307 | #endif /* CONFIG_SLABINFO */ |