Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
97d06609 CL |
2 | #ifndef MM_SLAB_H |
3 | #define MM_SLAB_H | |
4 | /* | |
5 | * Internal slab definitions | |
6 | */ | |
7 | ||
07f361b2 JK |
8 | #ifdef CONFIG_SLOB |
9 | /* | |
10 | * Common fields provided in kmem_cache by all slab allocators | |
11 | * This struct is either used directly by the allocator (SLOB) | |
12 | * or the allocator must include definitions for all fields | |
13 | * provided in kmem_cache_common in their definition of kmem_cache. | |
14 | * | |
15 | * Once we can do anonymous structs (C11 standard) we could put a | |
16 | * anonymous struct definition in these allocators so that the | |
17 | * separate allocations in the kmem_cache structure of SLAB and | |
18 | * SLUB is no longer needed. | |
19 | */ | |
20 | struct kmem_cache { | |
21 | unsigned int object_size;/* The original size of the object */ | |
22 | unsigned int size; /* The aligned/padded/added on size */ | |
23 | unsigned int align; /* Alignment as calculated */ | |
d50112ed | 24 | slab_flags_t flags; /* Active flags on the slab */ |
7bbdb81e AD |
25 | unsigned int useroffset;/* Usercopy region offset */ |
26 | unsigned int usersize; /* Usercopy region size */ | |
07f361b2 JK |
27 | const char *name; /* Slab name for sysfs */ |
28 | int refcount; /* Use counter */ | |
29 | void (*ctor)(void *); /* Called on object slot creation */ | |
30 | struct list_head list; /* List of all slab caches on the system */ | |
31 | }; | |
32 | ||
33 | #endif /* CONFIG_SLOB */ | |
34 | ||
35 | #ifdef CONFIG_SLAB | |
36 | #include <linux/slab_def.h> | |
37 | #endif | |
38 | ||
39 | #ifdef CONFIG_SLUB | |
40 | #include <linux/slub_def.h> | |
41 | #endif | |
42 | ||
43 | #include <linux/memcontrol.h> | |
11c7aec2 | 44 | #include <linux/fault-inject.h> |
11c7aec2 JDB |
45 | #include <linux/kasan.h> |
46 | #include <linux/kmemleak.h> | |
7c00fce9 | 47 | #include <linux/random.h> |
d92a8cfc | 48 | #include <linux/sched/mm.h> |
286e04b8 | 49 | #include <linux/kmemleak.h> |
07f361b2 | 50 | |
97d06609 CL |
51 | /* |
52 | * State of the slab allocator. | |
53 | * | |
54 | * This is used to describe the states of the allocator during bootup. | |
55 | * Allocators use this to gradually bootstrap themselves. Most allocators | |
56 | * have the problem that the structures used for managing slab caches are | |
57 | * allocated from slab caches themselves. | |
58 | */ | |
59 | enum slab_state { | |
60 | DOWN, /* No slab functionality yet */ | |
61 | PARTIAL, /* SLUB: kmem_cache_node available */ | |
ce8eb6c4 | 62 | PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */ |
97d06609 CL |
63 | UP, /* Slab caches usable but not all extras yet */ |
64 | FULL /* Everything is working */ | |
65 | }; | |
66 | ||
67 | extern enum slab_state slab_state; | |
68 | ||
18004c5d CL |
69 | /* The slab cache mutex protects the management structures during changes */ |
70 | extern struct mutex slab_mutex; | |
9b030cb8 CL |
71 | |
72 | /* The list of all slab caches on the system */ | |
18004c5d CL |
73 | extern struct list_head slab_caches; |
74 | ||
9b030cb8 CL |
75 | /* The slab cache that manages slab cache information */ |
76 | extern struct kmem_cache *kmem_cache; | |
77 | ||
af3b5f87 VB |
78 | /* A table of kmalloc cache names and sizes */ |
79 | extern const struct kmalloc_info_struct { | |
cb5d9fb3 | 80 | const char *name[NR_KMALLOC_TYPES]; |
55de8b9c | 81 | unsigned int size; |
af3b5f87 VB |
82 | } kmalloc_info[]; |
83 | ||
f97d5f63 CL |
84 | #ifndef CONFIG_SLOB |
85 | /* Kmalloc array related functions */ | |
34cc6990 | 86 | void setup_kmalloc_cache_index_table(void); |
d50112ed | 87 | void create_kmalloc_caches(slab_flags_t); |
2c59dd65 CL |
88 | |
89 | /* Find the kmalloc slab corresponding for a certain size */ | |
90 | struct kmem_cache *kmalloc_slab(size_t, gfp_t); | |
f97d5f63 CL |
91 | #endif |
92 | ||
44405099 | 93 | gfp_t kmalloc_fix_flags(gfp_t flags); |
f97d5f63 | 94 | |
9b030cb8 | 95 | /* Functions provided by the slab allocators */ |
d50112ed | 96 | int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); |
97d06609 | 97 | |
55de8b9c AD |
98 | struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size, |
99 | slab_flags_t flags, unsigned int useroffset, | |
100 | unsigned int usersize); | |
45530c44 | 101 | extern void create_boot_cache(struct kmem_cache *, const char *name, |
361d575e AD |
102 | unsigned int size, slab_flags_t flags, |
103 | unsigned int useroffset, unsigned int usersize); | |
45530c44 | 104 | |
423c929c | 105 | int slab_unmergeable(struct kmem_cache *s); |
f4957d5b | 106 | struct kmem_cache *find_mergeable(unsigned size, unsigned align, |
d50112ed | 107 | slab_flags_t flags, const char *name, void (*ctor)(void *)); |
12220dea | 108 | #ifndef CONFIG_SLOB |
2633d7a0 | 109 | struct kmem_cache * |
f4957d5b | 110 | __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
d50112ed | 111 | slab_flags_t flags, void (*ctor)(void *)); |
423c929c | 112 | |
0293d1fd | 113 | slab_flags_t kmem_cache_flags(unsigned int object_size, |
d50112ed | 114 | slab_flags_t flags, const char *name, |
423c929c | 115 | void (*ctor)(void *)); |
cbb79694 | 116 | #else |
2633d7a0 | 117 | static inline struct kmem_cache * |
f4957d5b | 118 | __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
d50112ed | 119 | slab_flags_t flags, void (*ctor)(void *)) |
cbb79694 | 120 | { return NULL; } |
423c929c | 121 | |
0293d1fd | 122 | static inline slab_flags_t kmem_cache_flags(unsigned int object_size, |
d50112ed | 123 | slab_flags_t flags, const char *name, |
423c929c JK |
124 | void (*ctor)(void *)) |
125 | { | |
126 | return flags; | |
127 | } | |
cbb79694 CL |
128 | #endif |
129 | ||
130 | ||
d8843922 | 131 | /* Legal flag mask for kmem_cache_create(), for various configurations */ |
6d6ea1e9 NB |
132 | #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ |
133 | SLAB_CACHE_DMA32 | SLAB_PANIC | \ | |
5f0d5a3a | 134 | SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS ) |
d8843922 GC |
135 | |
136 | #if defined(CONFIG_DEBUG_SLAB) | |
137 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) | |
138 | #elif defined(CONFIG_SLUB_DEBUG) | |
139 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ | |
becfda68 | 140 | SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) |
d8843922 GC |
141 | #else |
142 | #define SLAB_DEBUG_FLAGS (0) | |
143 | #endif | |
144 | ||
145 | #if defined(CONFIG_SLAB) | |
146 | #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \ | |
230e9fc2 | 147 | SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \ |
75f296d9 | 148 | SLAB_ACCOUNT) |
d8843922 GC |
149 | #elif defined(CONFIG_SLUB) |
150 | #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ | |
75f296d9 | 151 | SLAB_TEMPORARY | SLAB_ACCOUNT) |
d8843922 GC |
152 | #else |
153 | #define SLAB_CACHE_FLAGS (0) | |
154 | #endif | |
155 | ||
e70954fd | 156 | /* Common flags available with current configuration */ |
d8843922 GC |
157 | #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) |
158 | ||
e70954fd TG |
159 | /* Common flags permitted for kmem_cache_create */ |
160 | #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \ | |
161 | SLAB_RED_ZONE | \ | |
162 | SLAB_POISON | \ | |
163 | SLAB_STORE_USER | \ | |
164 | SLAB_TRACE | \ | |
165 | SLAB_CONSISTENCY_CHECKS | \ | |
166 | SLAB_MEM_SPREAD | \ | |
167 | SLAB_NOLEAKTRACE | \ | |
168 | SLAB_RECLAIM_ACCOUNT | \ | |
169 | SLAB_TEMPORARY | \ | |
e70954fd TG |
170 | SLAB_ACCOUNT) |
171 | ||
f9e13c0a | 172 | bool __kmem_cache_empty(struct kmem_cache *); |
945cf2b6 | 173 | int __kmem_cache_shutdown(struct kmem_cache *); |
52b4b950 | 174 | void __kmem_cache_release(struct kmem_cache *); |
c9fc5864 | 175 | int __kmem_cache_shrink(struct kmem_cache *); |
41a21285 | 176 | void slab_kmem_cache_release(struct kmem_cache *); |
945cf2b6 | 177 | |
b7454ad3 GC |
178 | struct seq_file; |
179 | struct file; | |
b7454ad3 | 180 | |
0d7561c6 GC |
181 | struct slabinfo { |
182 | unsigned long active_objs; | |
183 | unsigned long num_objs; | |
184 | unsigned long active_slabs; | |
185 | unsigned long num_slabs; | |
186 | unsigned long shared_avail; | |
187 | unsigned int limit; | |
188 | unsigned int batchcount; | |
189 | unsigned int shared; | |
190 | unsigned int objects_per_slab; | |
191 | unsigned int cache_order; | |
192 | }; | |
193 | ||
194 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); | |
195 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); | |
b7454ad3 GC |
196 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
197 | size_t count, loff_t *ppos); | |
ba6c496e | 198 | |
484748f0 CL |
199 | /* |
200 | * Generic implementation of bulk operations | |
201 | * These are useful for situations in which the allocator cannot | |
9f706d68 | 202 | * perform optimizations. In that case segments of the object listed |
484748f0 CL |
203 | * may be allocated or freed using these operations. |
204 | */ | |
205 | void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); | |
865762a8 | 206 | int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); |
484748f0 | 207 | |
6cea1d56 RG |
208 | static inline int cache_vmstat_idx(struct kmem_cache *s) |
209 | { | |
210 | return (s->flags & SLAB_RECLAIM_ACCOUNT) ? | |
d42f3245 | 211 | NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; |
6cea1d56 RG |
212 | } |
213 | ||
e42f174e VB |
214 | #ifdef CONFIG_SLUB_DEBUG |
215 | #ifdef CONFIG_SLUB_DEBUG_ON | |
216 | DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); | |
217 | #else | |
218 | DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); | |
219 | #endif | |
220 | extern void print_tracking(struct kmem_cache *s, void *object); | |
221 | #else | |
222 | static inline void print_tracking(struct kmem_cache *s, void *object) | |
223 | { | |
224 | } | |
225 | #endif | |
226 | ||
227 | /* | |
228 | * Returns true if any of the specified slub_debug flags is enabled for the | |
229 | * cache. Use only for flags parsed by setup_slub_debug() as it also enables | |
230 | * the static key. | |
231 | */ | |
232 | static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) | |
233 | { | |
234 | #ifdef CONFIG_SLUB_DEBUG | |
235 | VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); | |
236 | if (static_branch_unlikely(&slub_debug_enabled)) | |
237 | return s->flags & flags; | |
238 | #endif | |
239 | return false; | |
240 | } | |
241 | ||
84c07d11 | 242 | #ifdef CONFIG_MEMCG_KMEM |
286e04b8 RG |
243 | static inline struct obj_cgroup **page_obj_cgroups(struct page *page) |
244 | { | |
245 | /* | |
246 | * page->mem_cgroup and page->obj_cgroups are sharing the same | |
247 | * space. To distinguish between them in case we don't know for sure | |
248 | * that the page is a slab page (e.g. page_cgroup_ino()), let's | |
249 | * always set the lowest bit of obj_cgroups. | |
250 | */ | |
251 | return (struct obj_cgroup **) | |
252 | ((unsigned long)page->obj_cgroups & ~0x1UL); | |
253 | } | |
254 | ||
9855609b | 255 | static inline bool page_has_obj_cgroups(struct page *page) |
4d96ba35 | 256 | { |
9855609b | 257 | return ((unsigned long)page->obj_cgroups & 0x1UL); |
4d96ba35 RG |
258 | } |
259 | ||
10befea9 RG |
260 | int memcg_alloc_page_obj_cgroups(struct page *page, struct kmem_cache *s, |
261 | gfp_t gfp); | |
286e04b8 RG |
262 | |
263 | static inline void memcg_free_page_obj_cgroups(struct page *page) | |
264 | { | |
265 | kfree(page_obj_cgroups(page)); | |
266 | page->obj_cgroups = NULL; | |
267 | } | |
268 | ||
f2fe7b09 RG |
269 | static inline size_t obj_full_size(struct kmem_cache *s) |
270 | { | |
271 | /* | |
272 | * For each accounted object there is an extra space which is used | |
273 | * to store obj_cgroup membership. Charge it too. | |
274 | */ | |
275 | return s->size + sizeof(struct obj_cgroup *); | |
276 | } | |
277 | ||
10befea9 RG |
278 | static inline struct obj_cgroup *memcg_slab_pre_alloc_hook(struct kmem_cache *s, |
279 | size_t objects, | |
280 | gfp_t flags) | |
f2fe7b09 | 281 | { |
9855609b RG |
282 | struct obj_cgroup *objcg; |
283 | ||
284 | if (memcg_kmem_bypass()) | |
10befea9 | 285 | return NULL; |
f2fe7b09 | 286 | |
9855609b RG |
287 | objcg = get_obj_cgroup_from_current(); |
288 | if (!objcg) | |
10befea9 | 289 | return NULL; |
9855609b RG |
290 | |
291 | if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) { | |
292 | obj_cgroup_put(objcg); | |
10befea9 | 293 | return NULL; |
f2fe7b09 RG |
294 | } |
295 | ||
10befea9 | 296 | return objcg; |
f2fe7b09 RG |
297 | } |
298 | ||
299 | static inline void mod_objcg_state(struct obj_cgroup *objcg, | |
300 | struct pglist_data *pgdat, | |
301 | int idx, int nr) | |
302 | { | |
303 | struct mem_cgroup *memcg; | |
304 | struct lruvec *lruvec; | |
305 | ||
306 | rcu_read_lock(); | |
307 | memcg = obj_cgroup_memcg(objcg); | |
308 | lruvec = mem_cgroup_lruvec(memcg, pgdat); | |
309 | mod_memcg_lruvec_state(lruvec, idx, nr); | |
310 | rcu_read_unlock(); | |
311 | } | |
312 | ||
964d4bd3 RG |
313 | static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
314 | struct obj_cgroup *objcg, | |
10befea9 RG |
315 | gfp_t flags, size_t size, |
316 | void **p) | |
964d4bd3 RG |
317 | { |
318 | struct page *page; | |
319 | unsigned long off; | |
320 | size_t i; | |
321 | ||
10befea9 RG |
322 | if (!objcg) |
323 | return; | |
324 | ||
325 | flags &= ~__GFP_ACCOUNT; | |
964d4bd3 RG |
326 | for (i = 0; i < size; i++) { |
327 | if (likely(p[i])) { | |
328 | page = virt_to_head_page(p[i]); | |
10befea9 RG |
329 | |
330 | if (!page_has_obj_cgroups(page) && | |
331 | memcg_alloc_page_obj_cgroups(page, s, flags)) { | |
332 | obj_cgroup_uncharge(objcg, obj_full_size(s)); | |
333 | continue; | |
334 | } | |
335 | ||
964d4bd3 RG |
336 | off = obj_to_index(s, page, p[i]); |
337 | obj_cgroup_get(objcg); | |
338 | page_obj_cgroups(page)[off] = objcg; | |
f2fe7b09 RG |
339 | mod_objcg_state(objcg, page_pgdat(page), |
340 | cache_vmstat_idx(s), obj_full_size(s)); | |
341 | } else { | |
342 | obj_cgroup_uncharge(objcg, obj_full_size(s)); | |
964d4bd3 RG |
343 | } |
344 | } | |
345 | obj_cgroup_put(objcg); | |
964d4bd3 RG |
346 | } |
347 | ||
348 | static inline void memcg_slab_free_hook(struct kmem_cache *s, struct page *page, | |
349 | void *p) | |
350 | { | |
351 | struct obj_cgroup *objcg; | |
352 | unsigned int off; | |
353 | ||
10befea9 RG |
354 | if (!memcg_kmem_enabled()) |
355 | return; | |
356 | ||
357 | if (!page_has_obj_cgroups(page)) | |
964d4bd3 RG |
358 | return; |
359 | ||
360 | off = obj_to_index(s, page, p); | |
361 | objcg = page_obj_cgroups(page)[off]; | |
362 | page_obj_cgroups(page)[off] = NULL; | |
f2fe7b09 | 363 | |
10befea9 RG |
364 | if (!objcg) |
365 | return; | |
366 | ||
f2fe7b09 RG |
367 | obj_cgroup_uncharge(objcg, obj_full_size(s)); |
368 | mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s), | |
369 | -obj_full_size(s)); | |
370 | ||
964d4bd3 RG |
371 | obj_cgroup_put(objcg); |
372 | } | |
373 | ||
84c07d11 | 374 | #else /* CONFIG_MEMCG_KMEM */ |
9855609b RG |
375 | static inline bool page_has_obj_cgroups(struct page *page) |
376 | { | |
377 | return false; | |
378 | } | |
379 | ||
380 | static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr) | |
4d96ba35 RG |
381 | { |
382 | return NULL; | |
383 | } | |
384 | ||
286e04b8 RG |
385 | static inline int memcg_alloc_page_obj_cgroups(struct page *page, |
386 | struct kmem_cache *s, gfp_t gfp) | |
387 | { | |
388 | return 0; | |
389 | } | |
390 | ||
391 | static inline void memcg_free_page_obj_cgroups(struct page *page) | |
392 | { | |
393 | } | |
394 | ||
10befea9 RG |
395 | static inline struct obj_cgroup *memcg_slab_pre_alloc_hook(struct kmem_cache *s, |
396 | size_t objects, | |
397 | gfp_t flags) | |
f2fe7b09 RG |
398 | { |
399 | return NULL; | |
400 | } | |
401 | ||
964d4bd3 RG |
402 | static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
403 | struct obj_cgroup *objcg, | |
10befea9 RG |
404 | gfp_t flags, size_t size, |
405 | void **p) | |
964d4bd3 RG |
406 | { |
407 | } | |
408 | ||
409 | static inline void memcg_slab_free_hook(struct kmem_cache *s, struct page *page, | |
410 | void *p) | |
411 | { | |
412 | } | |
84c07d11 | 413 | #endif /* CONFIG_MEMCG_KMEM */ |
b9ce5ef4 | 414 | |
a64b5378 KC |
415 | static inline struct kmem_cache *virt_to_cache(const void *obj) |
416 | { | |
417 | struct page *page; | |
418 | ||
419 | page = virt_to_head_page(obj); | |
420 | if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n", | |
421 | __func__)) | |
422 | return NULL; | |
423 | return page->slab_cache; | |
424 | } | |
425 | ||
74d555be RG |
426 | static __always_inline void account_slab_page(struct page *page, int order, |
427 | struct kmem_cache *s) | |
6cea1d56 | 428 | { |
f2fe7b09 RG |
429 | mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), |
430 | PAGE_SIZE << order); | |
6cea1d56 RG |
431 | } |
432 | ||
74d555be RG |
433 | static __always_inline void unaccount_slab_page(struct page *page, int order, |
434 | struct kmem_cache *s) | |
6cea1d56 | 435 | { |
10befea9 | 436 | if (memcg_kmem_enabled()) |
f2fe7b09 | 437 | memcg_free_page_obj_cgroups(page); |
9855609b | 438 | |
f2fe7b09 RG |
439 | mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), |
440 | -(PAGE_SIZE << order)); | |
6cea1d56 RG |
441 | } |
442 | ||
e42f174e VB |
443 | static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) |
444 | { | |
445 | struct kmem_cache *cachep; | |
446 | ||
447 | if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) && | |
e42f174e VB |
448 | !kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS)) |
449 | return s; | |
450 | ||
451 | cachep = virt_to_cache(x); | |
10befea9 | 452 | if (WARN(cachep && cachep != s, |
e42f174e VB |
453 | "%s: Wrong slab cache. %s but object is from %s\n", |
454 | __func__, s->name, cachep->name)) | |
455 | print_tracking(cachep, x); | |
456 | return cachep; | |
457 | } | |
458 | ||
11c7aec2 JDB |
459 | static inline size_t slab_ksize(const struct kmem_cache *s) |
460 | { | |
461 | #ifndef CONFIG_SLUB | |
462 | return s->object_size; | |
463 | ||
464 | #else /* CONFIG_SLUB */ | |
465 | # ifdef CONFIG_SLUB_DEBUG | |
466 | /* | |
467 | * Debugging requires use of the padding between object | |
468 | * and whatever may come after it. | |
469 | */ | |
470 | if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) | |
471 | return s->object_size; | |
472 | # endif | |
80a9201a AP |
473 | if (s->flags & SLAB_KASAN) |
474 | return s->object_size; | |
11c7aec2 JDB |
475 | /* |
476 | * If we have the need to store the freelist pointer | |
477 | * back there or track user information then we can | |
478 | * only use the space before that information. | |
479 | */ | |
5f0d5a3a | 480 | if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) |
11c7aec2 JDB |
481 | return s->inuse; |
482 | /* | |
483 | * Else we can use all the padding etc for the allocation | |
484 | */ | |
485 | return s->size; | |
486 | #endif | |
487 | } | |
488 | ||
489 | static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s, | |
964d4bd3 RG |
490 | struct obj_cgroup **objcgp, |
491 | size_t size, gfp_t flags) | |
11c7aec2 JDB |
492 | { |
493 | flags &= gfp_allowed_mask; | |
d92a8cfc PZ |
494 | |
495 | fs_reclaim_acquire(flags); | |
496 | fs_reclaim_release(flags); | |
497 | ||
11c7aec2 JDB |
498 | might_sleep_if(gfpflags_allow_blocking(flags)); |
499 | ||
fab9963a | 500 | if (should_failslab(s, flags)) |
11c7aec2 JDB |
501 | return NULL; |
502 | ||
45264778 VD |
503 | if (memcg_kmem_enabled() && |
504 | ((flags & __GFP_ACCOUNT) || (s->flags & SLAB_ACCOUNT))) | |
10befea9 | 505 | *objcgp = memcg_slab_pre_alloc_hook(s, size, flags); |
45264778 VD |
506 | |
507 | return s; | |
11c7aec2 JDB |
508 | } |
509 | ||
964d4bd3 RG |
510 | static inline void slab_post_alloc_hook(struct kmem_cache *s, |
511 | struct obj_cgroup *objcg, | |
512 | gfp_t flags, size_t size, void **p) | |
11c7aec2 JDB |
513 | { |
514 | size_t i; | |
515 | ||
516 | flags &= gfp_allowed_mask; | |
517 | for (i = 0; i < size; i++) { | |
53128245 | 518 | p[i] = kasan_slab_alloc(s, p[i], flags); |
a2f77575 | 519 | /* As p[i] might get tagged, call kmemleak hook after KASAN. */ |
53128245 | 520 | kmemleak_alloc_recursive(p[i], s->object_size, 1, |
11c7aec2 | 521 | s->flags, flags); |
11c7aec2 | 522 | } |
45264778 | 523 | |
10befea9 RG |
524 | if (memcg_kmem_enabled()) |
525 | memcg_slab_post_alloc_hook(s, objcg, flags, size, p); | |
11c7aec2 JDB |
526 | } |
527 | ||
44c5356f | 528 | #ifndef CONFIG_SLOB |
ca34956b CL |
529 | /* |
530 | * The slab lists for all objects. | |
531 | */ | |
532 | struct kmem_cache_node { | |
533 | spinlock_t list_lock; | |
534 | ||
535 | #ifdef CONFIG_SLAB | |
536 | struct list_head slabs_partial; /* partial list first, better asm code */ | |
537 | struct list_head slabs_full; | |
538 | struct list_head slabs_free; | |
bf00bd34 DR |
539 | unsigned long total_slabs; /* length of all slab lists */ |
540 | unsigned long free_slabs; /* length of free slab list only */ | |
ca34956b CL |
541 | unsigned long free_objects; |
542 | unsigned int free_limit; | |
543 | unsigned int colour_next; /* Per-node cache coloring */ | |
544 | struct array_cache *shared; /* shared per node */ | |
c8522a3a | 545 | struct alien_cache **alien; /* on other nodes */ |
ca34956b CL |
546 | unsigned long next_reap; /* updated without locking */ |
547 | int free_touched; /* updated without locking */ | |
548 | #endif | |
549 | ||
550 | #ifdef CONFIG_SLUB | |
551 | unsigned long nr_partial; | |
552 | struct list_head partial; | |
553 | #ifdef CONFIG_SLUB_DEBUG | |
554 | atomic_long_t nr_slabs; | |
555 | atomic_long_t total_objects; | |
556 | struct list_head full; | |
557 | #endif | |
558 | #endif | |
559 | ||
560 | }; | |
e25839f6 | 561 | |
44c5356f CL |
562 | static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) |
563 | { | |
564 | return s->node[node]; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Iterator over all nodes. The body will be executed for each node that has | |
569 | * a kmem_cache_node structure allocated (which is true for all online nodes) | |
570 | */ | |
571 | #define for_each_kmem_cache_node(__s, __node, __n) \ | |
9163582c MP |
572 | for (__node = 0; __node < nr_node_ids; __node++) \ |
573 | if ((__n = get_node(__s, __node))) | |
44c5356f CL |
574 | |
575 | #endif | |
576 | ||
1df3b26f | 577 | void *slab_start(struct seq_file *m, loff_t *pos); |
276a2439 WL |
578 | void *slab_next(struct seq_file *m, void *p, loff_t *pos); |
579 | void slab_stop(struct seq_file *m, void *p); | |
b047501c | 580 | int memcg_slab_show(struct seq_file *m, void *p); |
5240ab40 | 581 | |
852d8be0 YS |
582 | #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) |
583 | void dump_unreclaimable_slab(void); | |
584 | #else | |
585 | static inline void dump_unreclaimable_slab(void) | |
586 | { | |
587 | } | |
588 | #endif | |
589 | ||
55834c59 AP |
590 | void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); |
591 | ||
7c00fce9 TG |
592 | #ifdef CONFIG_SLAB_FREELIST_RANDOM |
593 | int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, | |
594 | gfp_t gfp); | |
595 | void cache_random_seq_destroy(struct kmem_cache *cachep); | |
596 | #else | |
597 | static inline int cache_random_seq_create(struct kmem_cache *cachep, | |
598 | unsigned int count, gfp_t gfp) | |
599 | { | |
600 | return 0; | |
601 | } | |
602 | static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } | |
603 | #endif /* CONFIG_SLAB_FREELIST_RANDOM */ | |
604 | ||
6471384a AP |
605 | static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) |
606 | { | |
607 | if (static_branch_unlikely(&init_on_alloc)) { | |
608 | if (c->ctor) | |
609 | return false; | |
610 | if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) | |
611 | return flags & __GFP_ZERO; | |
612 | return true; | |
613 | } | |
614 | return flags & __GFP_ZERO; | |
615 | } | |
616 | ||
617 | static inline bool slab_want_init_on_free(struct kmem_cache *c) | |
618 | { | |
619 | if (static_branch_unlikely(&init_on_free)) | |
620 | return !(c->ctor || | |
621 | (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); | |
622 | return false; | |
623 | } | |
624 | ||
5240ab40 | 625 | #endif /* MM_SLAB_H */ |