]>
Commit | Line | Data |
---|---|---|
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> |
07f361b2 | 49 | |
97d06609 CL |
50 | /* |
51 | * State of the slab allocator. | |
52 | * | |
53 | * This is used to describe the states of the allocator during bootup. | |
54 | * Allocators use this to gradually bootstrap themselves. Most allocators | |
55 | * have the problem that the structures used for managing slab caches are | |
56 | * allocated from slab caches themselves. | |
57 | */ | |
58 | enum slab_state { | |
59 | DOWN, /* No slab functionality yet */ | |
60 | PARTIAL, /* SLUB: kmem_cache_node available */ | |
ce8eb6c4 | 61 | PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */ |
97d06609 CL |
62 | UP, /* Slab caches usable but not all extras yet */ |
63 | FULL /* Everything is working */ | |
64 | }; | |
65 | ||
66 | extern enum slab_state slab_state; | |
67 | ||
18004c5d CL |
68 | /* The slab cache mutex protects the management structures during changes */ |
69 | extern struct mutex slab_mutex; | |
9b030cb8 CL |
70 | |
71 | /* The list of all slab caches on the system */ | |
18004c5d CL |
72 | extern struct list_head slab_caches; |
73 | ||
9b030cb8 CL |
74 | /* The slab cache that manages slab cache information */ |
75 | extern struct kmem_cache *kmem_cache; | |
76 | ||
af3b5f87 VB |
77 | /* A table of kmalloc cache names and sizes */ |
78 | extern const struct kmalloc_info_struct { | |
cb5d9fb3 | 79 | const char *name[NR_KMALLOC_TYPES]; |
55de8b9c | 80 | unsigned int size; |
af3b5f87 VB |
81 | } kmalloc_info[]; |
82 | ||
f97d5f63 CL |
83 | #ifndef CONFIG_SLOB |
84 | /* Kmalloc array related functions */ | |
34cc6990 | 85 | void setup_kmalloc_cache_index_table(void); |
d50112ed | 86 | void create_kmalloc_caches(slab_flags_t); |
2c59dd65 CL |
87 | |
88 | /* Find the kmalloc slab corresponding for a certain size */ | |
89 | struct kmem_cache *kmalloc_slab(size_t, gfp_t); | |
f97d5f63 CL |
90 | #endif |
91 | ||
44405099 | 92 | gfp_t kmalloc_fix_flags(gfp_t flags); |
f97d5f63 | 93 | |
9b030cb8 | 94 | /* Functions provided by the slab allocators */ |
d50112ed | 95 | int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); |
97d06609 | 96 | |
55de8b9c AD |
97 | struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size, |
98 | slab_flags_t flags, unsigned int useroffset, | |
99 | unsigned int usersize); | |
45530c44 | 100 | extern void create_boot_cache(struct kmem_cache *, const char *name, |
361d575e AD |
101 | unsigned int size, slab_flags_t flags, |
102 | unsigned int useroffset, unsigned int usersize); | |
45530c44 | 103 | |
423c929c | 104 | int slab_unmergeable(struct kmem_cache *s); |
f4957d5b | 105 | struct kmem_cache *find_mergeable(unsigned size, unsigned align, |
d50112ed | 106 | slab_flags_t flags, const char *name, void (*ctor)(void *)); |
12220dea | 107 | #ifndef CONFIG_SLOB |
2633d7a0 | 108 | struct kmem_cache * |
f4957d5b | 109 | __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
d50112ed | 110 | slab_flags_t flags, void (*ctor)(void *)); |
423c929c | 111 | |
0293d1fd | 112 | slab_flags_t kmem_cache_flags(unsigned int object_size, |
37540008 | 113 | slab_flags_t flags, const char *name); |
cbb79694 | 114 | #else |
2633d7a0 | 115 | static inline struct kmem_cache * |
f4957d5b | 116 | __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
d50112ed | 117 | slab_flags_t flags, void (*ctor)(void *)) |
cbb79694 | 118 | { return NULL; } |
423c929c | 119 | |
0293d1fd | 120 | static inline slab_flags_t kmem_cache_flags(unsigned int object_size, |
37540008 | 121 | slab_flags_t flags, const char *name) |
423c929c JK |
122 | { |
123 | return flags; | |
124 | } | |
cbb79694 CL |
125 | #endif |
126 | ||
127 | ||
d8843922 | 128 | /* Legal flag mask for kmem_cache_create(), for various configurations */ |
6d6ea1e9 NB |
129 | #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ |
130 | SLAB_CACHE_DMA32 | SLAB_PANIC | \ | |
5f0d5a3a | 131 | SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS ) |
d8843922 GC |
132 | |
133 | #if defined(CONFIG_DEBUG_SLAB) | |
134 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) | |
135 | #elif defined(CONFIG_SLUB_DEBUG) | |
136 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ | |
becfda68 | 137 | SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) |
d8843922 GC |
138 | #else |
139 | #define SLAB_DEBUG_FLAGS (0) | |
140 | #endif | |
141 | ||
142 | #if defined(CONFIG_SLAB) | |
143 | #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \ | |
230e9fc2 | 144 | SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \ |
75f296d9 | 145 | SLAB_ACCOUNT) |
d8843922 GC |
146 | #elif defined(CONFIG_SLUB) |
147 | #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ | |
75f296d9 | 148 | SLAB_TEMPORARY | SLAB_ACCOUNT) |
d8843922 GC |
149 | #else |
150 | #define SLAB_CACHE_FLAGS (0) | |
151 | #endif | |
152 | ||
e70954fd | 153 | /* Common flags available with current configuration */ |
d8843922 GC |
154 | #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) |
155 | ||
e70954fd TG |
156 | /* Common flags permitted for kmem_cache_create */ |
157 | #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \ | |
158 | SLAB_RED_ZONE | \ | |
159 | SLAB_POISON | \ | |
160 | SLAB_STORE_USER | \ | |
161 | SLAB_TRACE | \ | |
162 | SLAB_CONSISTENCY_CHECKS | \ | |
163 | SLAB_MEM_SPREAD | \ | |
164 | SLAB_NOLEAKTRACE | \ | |
165 | SLAB_RECLAIM_ACCOUNT | \ | |
166 | SLAB_TEMPORARY | \ | |
e70954fd TG |
167 | SLAB_ACCOUNT) |
168 | ||
f9e13c0a | 169 | bool __kmem_cache_empty(struct kmem_cache *); |
945cf2b6 | 170 | int __kmem_cache_shutdown(struct kmem_cache *); |
52b4b950 | 171 | void __kmem_cache_release(struct kmem_cache *); |
c9fc5864 | 172 | int __kmem_cache_shrink(struct kmem_cache *); |
41a21285 | 173 | void slab_kmem_cache_release(struct kmem_cache *); |
945cf2b6 | 174 | |
b7454ad3 GC |
175 | struct seq_file; |
176 | struct file; | |
b7454ad3 | 177 | |
0d7561c6 GC |
178 | struct slabinfo { |
179 | unsigned long active_objs; | |
180 | unsigned long num_objs; | |
181 | unsigned long active_slabs; | |
182 | unsigned long num_slabs; | |
183 | unsigned long shared_avail; | |
184 | unsigned int limit; | |
185 | unsigned int batchcount; | |
186 | unsigned int shared; | |
187 | unsigned int objects_per_slab; | |
188 | unsigned int cache_order; | |
189 | }; | |
190 | ||
191 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); | |
192 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); | |
b7454ad3 GC |
193 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
194 | size_t count, loff_t *ppos); | |
ba6c496e | 195 | |
484748f0 CL |
196 | /* |
197 | * Generic implementation of bulk operations | |
198 | * These are useful for situations in which the allocator cannot | |
9f706d68 | 199 | * perform optimizations. In that case segments of the object listed |
484748f0 CL |
200 | * may be allocated or freed using these operations. |
201 | */ | |
202 | void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); | |
865762a8 | 203 | int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); |
484748f0 | 204 | |
1a984c4e | 205 | static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) |
6cea1d56 RG |
206 | { |
207 | return (s->flags & SLAB_RECLAIM_ACCOUNT) ? | |
d42f3245 | 208 | NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; |
6cea1d56 RG |
209 | } |
210 | ||
e42f174e VB |
211 | #ifdef CONFIG_SLUB_DEBUG |
212 | #ifdef CONFIG_SLUB_DEBUG_ON | |
213 | DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); | |
214 | #else | |
215 | DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); | |
216 | #endif | |
217 | extern void print_tracking(struct kmem_cache *s, void *object); | |
1f9f78b1 | 218 | long validate_slab_cache(struct kmem_cache *s); |
e42f174e VB |
219 | #else |
220 | static inline void print_tracking(struct kmem_cache *s, void *object) | |
221 | { | |
222 | } | |
223 | #endif | |
224 | ||
225 | /* | |
226 | * Returns true if any of the specified slub_debug flags is enabled for the | |
227 | * cache. Use only for flags parsed by setup_slub_debug() as it also enables | |
228 | * the static key. | |
229 | */ | |
230 | static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) | |
231 | { | |
232 | #ifdef CONFIG_SLUB_DEBUG | |
233 | VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); | |
234 | if (static_branch_unlikely(&slub_debug_enabled)) | |
235 | return s->flags & flags; | |
236 | #endif | |
237 | return false; | |
238 | } | |
239 | ||
84c07d11 | 240 | #ifdef CONFIG_MEMCG_KMEM |
10befea9 | 241 | int memcg_alloc_page_obj_cgroups(struct page *page, struct kmem_cache *s, |
2e9bd483 | 242 | gfp_t gfp, bool new_page); |
fdbcb2a6 WL |
243 | void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, |
244 | enum node_stat_item idx, int nr); | |
286e04b8 RG |
245 | |
246 | static inline void memcg_free_page_obj_cgroups(struct page *page) | |
247 | { | |
270c6a71 | 248 | kfree(page_objcgs(page)); |
bcfe06bf | 249 | page->memcg_data = 0; |
286e04b8 RG |
250 | } |
251 | ||
f2fe7b09 RG |
252 | static inline size_t obj_full_size(struct kmem_cache *s) |
253 | { | |
254 | /* | |
255 | * For each accounted object there is an extra space which is used | |
256 | * to store obj_cgroup membership. Charge it too. | |
257 | */ | |
258 | return s->size + sizeof(struct obj_cgroup *); | |
259 | } | |
260 | ||
becaba65 RG |
261 | /* |
262 | * Returns false if the allocation should fail. | |
263 | */ | |
264 | static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, | |
265 | struct obj_cgroup **objcgp, | |
266 | size_t objects, gfp_t flags) | |
f2fe7b09 | 267 | { |
9855609b RG |
268 | struct obj_cgroup *objcg; |
269 | ||
becaba65 RG |
270 | if (!memcg_kmem_enabled()) |
271 | return true; | |
272 | ||
273 | if (!(flags & __GFP_ACCOUNT) && !(s->flags & SLAB_ACCOUNT)) | |
274 | return true; | |
275 | ||
9855609b RG |
276 | objcg = get_obj_cgroup_from_current(); |
277 | if (!objcg) | |
becaba65 | 278 | return true; |
9855609b RG |
279 | |
280 | if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) { | |
281 | obj_cgroup_put(objcg); | |
becaba65 | 282 | return false; |
f2fe7b09 RG |
283 | } |
284 | ||
becaba65 RG |
285 | *objcgp = objcg; |
286 | return true; | |
f2fe7b09 RG |
287 | } |
288 | ||
964d4bd3 RG |
289 | static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
290 | struct obj_cgroup *objcg, | |
10befea9 RG |
291 | gfp_t flags, size_t size, |
292 | void **p) | |
964d4bd3 RG |
293 | { |
294 | struct page *page; | |
295 | unsigned long off; | |
296 | size_t i; | |
297 | ||
becaba65 | 298 | if (!memcg_kmem_enabled() || !objcg) |
10befea9 RG |
299 | return; |
300 | ||
964d4bd3 RG |
301 | for (i = 0; i < size; i++) { |
302 | if (likely(p[i])) { | |
303 | page = virt_to_head_page(p[i]); | |
10befea9 | 304 | |
270c6a71 | 305 | if (!page_objcgs(page) && |
2e9bd483 RG |
306 | memcg_alloc_page_obj_cgroups(page, s, flags, |
307 | false)) { | |
10befea9 RG |
308 | obj_cgroup_uncharge(objcg, obj_full_size(s)); |
309 | continue; | |
310 | } | |
311 | ||
964d4bd3 RG |
312 | off = obj_to_index(s, page, p[i]); |
313 | obj_cgroup_get(objcg); | |
270c6a71 | 314 | page_objcgs(page)[off] = objcg; |
f2fe7b09 RG |
315 | mod_objcg_state(objcg, page_pgdat(page), |
316 | cache_vmstat_idx(s), obj_full_size(s)); | |
317 | } else { | |
318 | obj_cgroup_uncharge(objcg, obj_full_size(s)); | |
964d4bd3 RG |
319 | } |
320 | } | |
321 | obj_cgroup_put(objcg); | |
964d4bd3 RG |
322 | } |
323 | ||
d1b2cf6c BR |
324 | static inline void memcg_slab_free_hook(struct kmem_cache *s_orig, |
325 | void **p, int objects) | |
964d4bd3 | 326 | { |
d1b2cf6c | 327 | struct kmem_cache *s; |
270c6a71 | 328 | struct obj_cgroup **objcgs; |
964d4bd3 | 329 | struct obj_cgroup *objcg; |
d1b2cf6c | 330 | struct page *page; |
964d4bd3 | 331 | unsigned int off; |
d1b2cf6c | 332 | int i; |
964d4bd3 | 333 | |
10befea9 RG |
334 | if (!memcg_kmem_enabled()) |
335 | return; | |
336 | ||
d1b2cf6c BR |
337 | for (i = 0; i < objects; i++) { |
338 | if (unlikely(!p[i])) | |
339 | continue; | |
964d4bd3 | 340 | |
d1b2cf6c | 341 | page = virt_to_head_page(p[i]); |
270c6a71 RG |
342 | objcgs = page_objcgs(page); |
343 | if (!objcgs) | |
d1b2cf6c | 344 | continue; |
f2fe7b09 | 345 | |
d1b2cf6c BR |
346 | if (!s_orig) |
347 | s = page->slab_cache; | |
348 | else | |
349 | s = s_orig; | |
10befea9 | 350 | |
d1b2cf6c | 351 | off = obj_to_index(s, page, p[i]); |
270c6a71 | 352 | objcg = objcgs[off]; |
d1b2cf6c BR |
353 | if (!objcg) |
354 | continue; | |
f2fe7b09 | 355 | |
270c6a71 | 356 | objcgs[off] = NULL; |
d1b2cf6c BR |
357 | obj_cgroup_uncharge(objcg, obj_full_size(s)); |
358 | mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s), | |
359 | -obj_full_size(s)); | |
360 | obj_cgroup_put(objcg); | |
361 | } | |
964d4bd3 RG |
362 | } |
363 | ||
84c07d11 | 364 | #else /* CONFIG_MEMCG_KMEM */ |
9855609b | 365 | static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr) |
4d96ba35 RG |
366 | { |
367 | return NULL; | |
368 | } | |
369 | ||
286e04b8 | 370 | static inline int memcg_alloc_page_obj_cgroups(struct page *page, |
2e9bd483 RG |
371 | struct kmem_cache *s, gfp_t gfp, |
372 | bool new_page) | |
286e04b8 RG |
373 | { |
374 | return 0; | |
375 | } | |
376 | ||
377 | static inline void memcg_free_page_obj_cgroups(struct page *page) | |
378 | { | |
379 | } | |
380 | ||
becaba65 RG |
381 | static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, |
382 | struct obj_cgroup **objcgp, | |
383 | size_t objects, gfp_t flags) | |
f2fe7b09 | 384 | { |
becaba65 | 385 | return true; |
f2fe7b09 RG |
386 | } |
387 | ||
964d4bd3 RG |
388 | static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
389 | struct obj_cgroup *objcg, | |
10befea9 RG |
390 | gfp_t flags, size_t size, |
391 | void **p) | |
964d4bd3 RG |
392 | { |
393 | } | |
394 | ||
d1b2cf6c BR |
395 | static inline void memcg_slab_free_hook(struct kmem_cache *s, |
396 | void **p, int objects) | |
964d4bd3 RG |
397 | { |
398 | } | |
84c07d11 | 399 | #endif /* CONFIG_MEMCG_KMEM */ |
b9ce5ef4 | 400 | |
a64b5378 KC |
401 | static inline struct kmem_cache *virt_to_cache(const void *obj) |
402 | { | |
403 | struct page *page; | |
404 | ||
405 | page = virt_to_head_page(obj); | |
406 | if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n", | |
407 | __func__)) | |
408 | return NULL; | |
409 | return page->slab_cache; | |
410 | } | |
411 | ||
74d555be | 412 | static __always_inline void account_slab_page(struct page *page, int order, |
2e9bd483 RG |
413 | struct kmem_cache *s, |
414 | gfp_t gfp) | |
6cea1d56 | 415 | { |
2e9bd483 RG |
416 | if (memcg_kmem_enabled() && (s->flags & SLAB_ACCOUNT)) |
417 | memcg_alloc_page_obj_cgroups(page, s, gfp, true); | |
418 | ||
f2fe7b09 RG |
419 | mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), |
420 | PAGE_SIZE << order); | |
6cea1d56 RG |
421 | } |
422 | ||
74d555be RG |
423 | static __always_inline void unaccount_slab_page(struct page *page, int order, |
424 | struct kmem_cache *s) | |
6cea1d56 | 425 | { |
10befea9 | 426 | if (memcg_kmem_enabled()) |
f2fe7b09 | 427 | memcg_free_page_obj_cgroups(page); |
9855609b | 428 | |
f2fe7b09 RG |
429 | mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), |
430 | -(PAGE_SIZE << order)); | |
6cea1d56 RG |
431 | } |
432 | ||
e42f174e VB |
433 | static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) |
434 | { | |
435 | struct kmem_cache *cachep; | |
436 | ||
437 | if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) && | |
e42f174e VB |
438 | !kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS)) |
439 | return s; | |
440 | ||
441 | cachep = virt_to_cache(x); | |
10befea9 | 442 | if (WARN(cachep && cachep != s, |
e42f174e VB |
443 | "%s: Wrong slab cache. %s but object is from %s\n", |
444 | __func__, s->name, cachep->name)) | |
445 | print_tracking(cachep, x); | |
446 | return cachep; | |
447 | } | |
448 | ||
11c7aec2 JDB |
449 | static inline size_t slab_ksize(const struct kmem_cache *s) |
450 | { | |
451 | #ifndef CONFIG_SLUB | |
452 | return s->object_size; | |
453 | ||
454 | #else /* CONFIG_SLUB */ | |
455 | # ifdef CONFIG_SLUB_DEBUG | |
456 | /* | |
457 | * Debugging requires use of the padding between object | |
458 | * and whatever may come after it. | |
459 | */ | |
460 | if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) | |
461 | return s->object_size; | |
462 | # endif | |
80a9201a AP |
463 | if (s->flags & SLAB_KASAN) |
464 | return s->object_size; | |
11c7aec2 JDB |
465 | /* |
466 | * If we have the need to store the freelist pointer | |
467 | * back there or track user information then we can | |
468 | * only use the space before that information. | |
469 | */ | |
5f0d5a3a | 470 | if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) |
11c7aec2 JDB |
471 | return s->inuse; |
472 | /* | |
473 | * Else we can use all the padding etc for the allocation | |
474 | */ | |
475 | return s->size; | |
476 | #endif | |
477 | } | |
478 | ||
479 | static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s, | |
964d4bd3 RG |
480 | struct obj_cgroup **objcgp, |
481 | size_t size, gfp_t flags) | |
11c7aec2 JDB |
482 | { |
483 | flags &= gfp_allowed_mask; | |
d92a8cfc | 484 | |
95d6c701 | 485 | might_alloc(flags); |
11c7aec2 | 486 | |
fab9963a | 487 | if (should_failslab(s, flags)) |
11c7aec2 JDB |
488 | return NULL; |
489 | ||
becaba65 RG |
490 | if (!memcg_slab_pre_alloc_hook(s, objcgp, size, flags)) |
491 | return NULL; | |
45264778 VD |
492 | |
493 | return s; | |
11c7aec2 JDB |
494 | } |
495 | ||
964d4bd3 | 496 | static inline void slab_post_alloc_hook(struct kmem_cache *s, |
da844b78 AK |
497 | struct obj_cgroup *objcg, gfp_t flags, |
498 | size_t size, void **p, bool init) | |
11c7aec2 JDB |
499 | { |
500 | size_t i; | |
501 | ||
502 | flags &= gfp_allowed_mask; | |
da844b78 AK |
503 | |
504 | /* | |
505 | * As memory initialization might be integrated into KASAN, | |
506 | * kasan_slab_alloc and initialization memset must be | |
507 | * kept together to avoid discrepancies in behavior. | |
508 | * | |
509 | * As p[i] might get tagged, memset and kmemleak hook come after KASAN. | |
510 | */ | |
11c7aec2 | 511 | for (i = 0; i < size; i++) { |
da844b78 AK |
512 | p[i] = kasan_slab_alloc(s, p[i], flags, init); |
513 | if (p[i] && init && !kasan_has_integrated_init()) | |
514 | memset(p[i], 0, s->object_size); | |
53128245 | 515 | kmemleak_alloc_recursive(p[i], s->object_size, 1, |
11c7aec2 | 516 | s->flags, flags); |
11c7aec2 | 517 | } |
45264778 | 518 | |
becaba65 | 519 | memcg_slab_post_alloc_hook(s, objcg, flags, size, p); |
11c7aec2 JDB |
520 | } |
521 | ||
44c5356f | 522 | #ifndef CONFIG_SLOB |
ca34956b CL |
523 | /* |
524 | * The slab lists for all objects. | |
525 | */ | |
526 | struct kmem_cache_node { | |
527 | spinlock_t list_lock; | |
528 | ||
529 | #ifdef CONFIG_SLAB | |
530 | struct list_head slabs_partial; /* partial list first, better asm code */ | |
531 | struct list_head slabs_full; | |
532 | struct list_head slabs_free; | |
bf00bd34 DR |
533 | unsigned long total_slabs; /* length of all slab lists */ |
534 | unsigned long free_slabs; /* length of free slab list only */ | |
ca34956b CL |
535 | unsigned long free_objects; |
536 | unsigned int free_limit; | |
537 | unsigned int colour_next; /* Per-node cache coloring */ | |
538 | struct array_cache *shared; /* shared per node */ | |
c8522a3a | 539 | struct alien_cache **alien; /* on other nodes */ |
ca34956b CL |
540 | unsigned long next_reap; /* updated without locking */ |
541 | int free_touched; /* updated without locking */ | |
542 | #endif | |
543 | ||
544 | #ifdef CONFIG_SLUB | |
545 | unsigned long nr_partial; | |
546 | struct list_head partial; | |
547 | #ifdef CONFIG_SLUB_DEBUG | |
548 | atomic_long_t nr_slabs; | |
549 | atomic_long_t total_objects; | |
550 | struct list_head full; | |
551 | #endif | |
552 | #endif | |
553 | ||
554 | }; | |
e25839f6 | 555 | |
44c5356f CL |
556 | static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) |
557 | { | |
558 | return s->node[node]; | |
559 | } | |
560 | ||
561 | /* | |
562 | * Iterator over all nodes. The body will be executed for each node that has | |
563 | * a kmem_cache_node structure allocated (which is true for all online nodes) | |
564 | */ | |
565 | #define for_each_kmem_cache_node(__s, __node, __n) \ | |
9163582c MP |
566 | for (__node = 0; __node < nr_node_ids; __node++) \ |
567 | if ((__n = get_node(__s, __node))) | |
44c5356f CL |
568 | |
569 | #endif | |
570 | ||
1df3b26f | 571 | void *slab_start(struct seq_file *m, loff_t *pos); |
276a2439 WL |
572 | void *slab_next(struct seq_file *m, void *p, loff_t *pos); |
573 | void slab_stop(struct seq_file *m, void *p); | |
b047501c | 574 | int memcg_slab_show(struct seq_file *m, void *p); |
5240ab40 | 575 | |
852d8be0 YS |
576 | #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) |
577 | void dump_unreclaimable_slab(void); | |
578 | #else | |
579 | static inline void dump_unreclaimable_slab(void) | |
580 | { | |
581 | } | |
582 | #endif | |
583 | ||
55834c59 AP |
584 | void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); |
585 | ||
7c00fce9 TG |
586 | #ifdef CONFIG_SLAB_FREELIST_RANDOM |
587 | int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, | |
588 | gfp_t gfp); | |
589 | void cache_random_seq_destroy(struct kmem_cache *cachep); | |
590 | #else | |
591 | static inline int cache_random_seq_create(struct kmem_cache *cachep, | |
592 | unsigned int count, gfp_t gfp) | |
593 | { | |
594 | return 0; | |
595 | } | |
596 | static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } | |
597 | #endif /* CONFIG_SLAB_FREELIST_RANDOM */ | |
598 | ||
6471384a AP |
599 | static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) |
600 | { | |
51cba1eb KC |
601 | if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, |
602 | &init_on_alloc)) { | |
6471384a AP |
603 | if (c->ctor) |
604 | return false; | |
605 | if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) | |
606 | return flags & __GFP_ZERO; | |
607 | return true; | |
608 | } | |
609 | return flags & __GFP_ZERO; | |
610 | } | |
611 | ||
612 | static inline bool slab_want_init_on_free(struct kmem_cache *c) | |
613 | { | |
51cba1eb KC |
614 | if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, |
615 | &init_on_free)) | |
6471384a AP |
616 | return !(c->ctor || |
617 | (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); | |
618 | return false; | |
619 | } | |
620 | ||
64dd6849 FM |
621 | #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) |
622 | void debugfs_slab_release(struct kmem_cache *); | |
623 | #else | |
624 | static inline void debugfs_slab_release(struct kmem_cache *s) { } | |
625 | #endif | |
626 | ||
5bb1bb35 | 627 | #ifdef CONFIG_PRINTK |
8e7f37f2 PM |
628 | #define KS_ADDRS_COUNT 16 |
629 | struct kmem_obj_info { | |
630 | void *kp_ptr; | |
631 | struct page *kp_page; | |
632 | void *kp_objp; | |
633 | unsigned long kp_data_offset; | |
634 | struct kmem_cache *kp_slab_cache; | |
635 | void *kp_ret; | |
636 | void *kp_stack[KS_ADDRS_COUNT]; | |
e548eaa1 | 637 | void *kp_free_stack[KS_ADDRS_COUNT]; |
8e7f37f2 PM |
638 | }; |
639 | void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page); | |
5bb1bb35 | 640 | #endif |
8e7f37f2 | 641 | |
5240ab40 | 642 | #endif /* MM_SLAB_H */ |