Commit | Line | Data |
---|---|---|
039363f3 CL |
1 | /* |
2 | * Slab allocator functions that are independent of the allocator strategy | |
3 | * | |
4 | * (C) 2012 Christoph Lameter <cl@linux.com> | |
5 | */ | |
6 | #include <linux/slab.h> | |
7 | ||
8 | #include <linux/mm.h> | |
9 | #include <linux/poison.h> | |
10 | #include <linux/interrupt.h> | |
11 | #include <linux/memory.h> | |
12 | #include <linux/compiler.h> | |
13 | #include <linux/module.h> | |
20cea968 CL |
14 | #include <linux/cpu.h> |
15 | #include <linux/uaccess.h> | |
b7454ad3 GC |
16 | #include <linux/seq_file.h> |
17 | #include <linux/proc_fs.h> | |
039363f3 CL |
18 | #include <asm/cacheflush.h> |
19 | #include <asm/tlbflush.h> | |
20 | #include <asm/page.h> | |
2633d7a0 | 21 | #include <linux/memcontrol.h> |
928cec9c AR |
22 | |
23 | #define CREATE_TRACE_POINTS | |
f1b6eb6e | 24 | #include <trace/events/kmem.h> |
039363f3 | 25 | |
97d06609 CL |
26 | #include "slab.h" |
27 | ||
28 | enum slab_state slab_state; | |
18004c5d CL |
29 | LIST_HEAD(slab_caches); |
30 | DEFINE_MUTEX(slab_mutex); | |
9b030cb8 | 31 | struct kmem_cache *kmem_cache; |
97d06609 | 32 | |
423c929c JK |
33 | /* |
34 | * Set of flags that will prevent slab merging | |
35 | */ | |
36 | #define SLAB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ | |
37 | SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE | \ | |
38 | SLAB_FAILSLAB) | |
39 | ||
40 | #define SLAB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \ | |
41 | SLAB_CACHE_DMA | SLAB_NOTRACK) | |
42 | ||
43 | /* | |
44 | * Merge control. If this is set then no merging of slab caches will occur. | |
45 | * (Could be removed. This was introduced to pacify the merge skeptics.) | |
46 | */ | |
47 | static int slab_nomerge; | |
48 | ||
49 | static int __init setup_slab_nomerge(char *str) | |
50 | { | |
51 | slab_nomerge = 1; | |
52 | return 1; | |
53 | } | |
54 | ||
55 | #ifdef CONFIG_SLUB | |
56 | __setup_param("slub_nomerge", slub_nomerge, setup_slab_nomerge, 0); | |
57 | #endif | |
58 | ||
59 | __setup("slab_nomerge", setup_slab_nomerge); | |
60 | ||
07f361b2 JK |
61 | /* |
62 | * Determine the size of a slab object | |
63 | */ | |
64 | unsigned int kmem_cache_size(struct kmem_cache *s) | |
65 | { | |
66 | return s->object_size; | |
67 | } | |
68 | EXPORT_SYMBOL(kmem_cache_size); | |
69 | ||
77be4b13 | 70 | #ifdef CONFIG_DEBUG_VM |
794b1248 | 71 | static int kmem_cache_sanity_check(const char *name, size_t size) |
039363f3 CL |
72 | { |
73 | struct kmem_cache *s = NULL; | |
74 | ||
039363f3 CL |
75 | if (!name || in_interrupt() || size < sizeof(void *) || |
76 | size > KMALLOC_MAX_SIZE) { | |
77be4b13 SK |
77 | pr_err("kmem_cache_create(%s) integrity check failed\n", name); |
78 | return -EINVAL; | |
039363f3 | 79 | } |
b920536a | 80 | |
20cea968 CL |
81 | list_for_each_entry(s, &slab_caches, list) { |
82 | char tmp; | |
83 | int res; | |
84 | ||
85 | /* | |
86 | * This happens when the module gets unloaded and doesn't | |
87 | * destroy its slab cache and no-one else reuses the vmalloc | |
88 | * area of the module. Print a warning. | |
89 | */ | |
90 | res = probe_kernel_address(s->name, tmp); | |
91 | if (res) { | |
77be4b13 | 92 | pr_err("Slab cache with size %d has lost its name\n", |
20cea968 CL |
93 | s->object_size); |
94 | continue; | |
95 | } | |
20cea968 CL |
96 | } |
97 | ||
98 | WARN_ON(strchr(name, ' ')); /* It confuses parsers */ | |
77be4b13 SK |
99 | return 0; |
100 | } | |
101 | #else | |
794b1248 | 102 | static inline int kmem_cache_sanity_check(const char *name, size_t size) |
77be4b13 SK |
103 | { |
104 | return 0; | |
105 | } | |
20cea968 CL |
106 | #endif |
107 | ||
55007d84 | 108 | #ifdef CONFIG_MEMCG_KMEM |
33a690c4 VD |
109 | static int memcg_alloc_cache_params(struct mem_cgroup *memcg, |
110 | struct kmem_cache *s, struct kmem_cache *root_cache) | |
111 | { | |
112 | size_t size; | |
113 | ||
114 | if (!memcg_kmem_enabled()) | |
115 | return 0; | |
116 | ||
117 | if (!memcg) { | |
118 | size = offsetof(struct memcg_cache_params, memcg_caches); | |
dbcf73e2 | 119 | size += memcg_nr_cache_ids * sizeof(void *); |
33a690c4 VD |
120 | } else |
121 | size = sizeof(struct memcg_cache_params); | |
122 | ||
123 | s->memcg_params = kzalloc(size, GFP_KERNEL); | |
124 | if (!s->memcg_params) | |
125 | return -ENOMEM; | |
126 | ||
127 | if (memcg) { | |
128 | s->memcg_params->memcg = memcg; | |
129 | s->memcg_params->root_cache = root_cache; | |
130 | } else | |
131 | s->memcg_params->is_root_cache = true; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | static void memcg_free_cache_params(struct kmem_cache *s) | |
137 | { | |
138 | kfree(s->memcg_params); | |
139 | } | |
140 | ||
6f817f4c VD |
141 | static int memcg_update_cache_params(struct kmem_cache *s, int num_memcgs) |
142 | { | |
143 | int size; | |
144 | struct memcg_cache_params *new_params, *cur_params; | |
145 | ||
146 | BUG_ON(!is_root_cache(s)); | |
147 | ||
148 | size = offsetof(struct memcg_cache_params, memcg_caches); | |
149 | size += num_memcgs * sizeof(void *); | |
150 | ||
151 | new_params = kzalloc(size, GFP_KERNEL); | |
152 | if (!new_params) | |
153 | return -ENOMEM; | |
154 | ||
155 | cur_params = s->memcg_params; | |
156 | memcpy(new_params->memcg_caches, cur_params->memcg_caches, | |
dbcf73e2 | 157 | memcg_nr_cache_ids * sizeof(void *)); |
6f817f4c VD |
158 | |
159 | new_params->is_root_cache = true; | |
160 | ||
161 | rcu_assign_pointer(s->memcg_params, new_params); | |
162 | if (cur_params) | |
163 | kfree_rcu(cur_params, rcu_head); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
55007d84 GC |
168 | int memcg_update_all_caches(int num_memcgs) |
169 | { | |
170 | struct kmem_cache *s; | |
171 | int ret = 0; | |
55007d84 | 172 | |
05257a1a | 173 | mutex_lock(&slab_mutex); |
55007d84 GC |
174 | list_for_each_entry(s, &slab_caches, list) { |
175 | if (!is_root_cache(s)) | |
176 | continue; | |
177 | ||
6f817f4c | 178 | ret = memcg_update_cache_params(s, num_memcgs); |
55007d84 | 179 | /* |
55007d84 GC |
180 | * Instead of freeing the memory, we'll just leave the caches |
181 | * up to this point in an updated state. | |
182 | */ | |
183 | if (ret) | |
05257a1a | 184 | break; |
55007d84 | 185 | } |
55007d84 GC |
186 | mutex_unlock(&slab_mutex); |
187 | return ret; | |
188 | } | |
33a690c4 VD |
189 | #else |
190 | static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg, | |
191 | struct kmem_cache *s, struct kmem_cache *root_cache) | |
192 | { | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static inline void memcg_free_cache_params(struct kmem_cache *s) | |
197 | { | |
198 | } | |
199 | #endif /* CONFIG_MEMCG_KMEM */ | |
55007d84 | 200 | |
423c929c JK |
201 | /* |
202 | * Find a mergeable slab cache | |
203 | */ | |
204 | int slab_unmergeable(struct kmem_cache *s) | |
205 | { | |
206 | if (slab_nomerge || (s->flags & SLAB_NEVER_MERGE)) | |
207 | return 1; | |
208 | ||
209 | if (!is_root_cache(s)) | |
210 | return 1; | |
211 | ||
212 | if (s->ctor) | |
213 | return 1; | |
214 | ||
215 | /* | |
216 | * We may have set a slab to be unmergeable during bootstrap. | |
217 | */ | |
218 | if (s->refcount < 0) | |
219 | return 1; | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | struct kmem_cache *find_mergeable(size_t size, size_t align, | |
225 | unsigned long flags, const char *name, void (*ctor)(void *)) | |
226 | { | |
227 | struct kmem_cache *s; | |
228 | ||
229 | if (slab_nomerge || (flags & SLAB_NEVER_MERGE)) | |
230 | return NULL; | |
231 | ||
232 | if (ctor) | |
233 | return NULL; | |
234 | ||
235 | size = ALIGN(size, sizeof(void *)); | |
236 | align = calculate_alignment(flags, align, size); | |
237 | size = ALIGN(size, align); | |
238 | flags = kmem_cache_flags(size, flags, name, NULL); | |
239 | ||
54362057 | 240 | list_for_each_entry_reverse(s, &slab_caches, list) { |
423c929c JK |
241 | if (slab_unmergeable(s)) |
242 | continue; | |
243 | ||
244 | if (size > s->size) | |
245 | continue; | |
246 | ||
247 | if ((flags & SLAB_MERGE_SAME) != (s->flags & SLAB_MERGE_SAME)) | |
248 | continue; | |
249 | /* | |
250 | * Check if alignment is compatible. | |
251 | * Courtesy of Adrian Drzewiecki | |
252 | */ | |
253 | if ((s->size & ~(align - 1)) != s->size) | |
254 | continue; | |
255 | ||
256 | if (s->size - size >= sizeof(void *)) | |
257 | continue; | |
258 | ||
95069ac8 JK |
259 | if (IS_ENABLED(CONFIG_SLAB) && align && |
260 | (align > s->align || s->align % align)) | |
261 | continue; | |
262 | ||
423c929c JK |
263 | return s; |
264 | } | |
265 | return NULL; | |
266 | } | |
267 | ||
45906855 CL |
268 | /* |
269 | * Figure out what the alignment of the objects will be given a set of | |
270 | * flags, a user specified alignment and the size of the objects. | |
271 | */ | |
272 | unsigned long calculate_alignment(unsigned long flags, | |
273 | unsigned long align, unsigned long size) | |
274 | { | |
275 | /* | |
276 | * If the user wants hardware cache aligned objects then follow that | |
277 | * suggestion if the object is sufficiently large. | |
278 | * | |
279 | * The hardware cache alignment cannot override the specified | |
280 | * alignment though. If that is greater then use it. | |
281 | */ | |
282 | if (flags & SLAB_HWCACHE_ALIGN) { | |
283 | unsigned long ralign = cache_line_size(); | |
284 | while (size <= ralign / 2) | |
285 | ralign /= 2; | |
286 | align = max(align, ralign); | |
287 | } | |
288 | ||
289 | if (align < ARCH_SLAB_MINALIGN) | |
290 | align = ARCH_SLAB_MINALIGN; | |
291 | ||
292 | return ALIGN(align, sizeof(void *)); | |
293 | } | |
294 | ||
794b1248 VD |
295 | static struct kmem_cache * |
296 | do_kmem_cache_create(char *name, size_t object_size, size_t size, size_t align, | |
297 | unsigned long flags, void (*ctor)(void *), | |
298 | struct mem_cgroup *memcg, struct kmem_cache *root_cache) | |
299 | { | |
300 | struct kmem_cache *s; | |
301 | int err; | |
302 | ||
303 | err = -ENOMEM; | |
304 | s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL); | |
305 | if (!s) | |
306 | goto out; | |
307 | ||
308 | s->name = name; | |
309 | s->object_size = object_size; | |
310 | s->size = size; | |
311 | s->align = align; | |
312 | s->ctor = ctor; | |
313 | ||
314 | err = memcg_alloc_cache_params(memcg, s, root_cache); | |
315 | if (err) | |
316 | goto out_free_cache; | |
317 | ||
318 | err = __kmem_cache_create(s, flags); | |
319 | if (err) | |
320 | goto out_free_cache; | |
321 | ||
322 | s->refcount = 1; | |
323 | list_add(&s->list, &slab_caches); | |
794b1248 VD |
324 | out: |
325 | if (err) | |
326 | return ERR_PTR(err); | |
327 | return s; | |
328 | ||
329 | out_free_cache: | |
330 | memcg_free_cache_params(s); | |
7c4da061 | 331 | kmem_cache_free(kmem_cache, s); |
794b1248 VD |
332 | goto out; |
333 | } | |
45906855 | 334 | |
77be4b13 SK |
335 | /* |
336 | * kmem_cache_create - Create a cache. | |
337 | * @name: A string which is used in /proc/slabinfo to identify this cache. | |
338 | * @size: The size of objects to be created in this cache. | |
339 | * @align: The required alignment for the objects. | |
340 | * @flags: SLAB flags | |
341 | * @ctor: A constructor for the objects. | |
342 | * | |
343 | * Returns a ptr to the cache on success, NULL on failure. | |
344 | * Cannot be called within a interrupt, but can be interrupted. | |
345 | * The @ctor is run when new pages are allocated by the cache. | |
346 | * | |
347 | * The flags are | |
348 | * | |
349 | * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) | |
350 | * to catch references to uninitialised memory. | |
351 | * | |
352 | * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check | |
353 | * for buffer overruns. | |
354 | * | |
355 | * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware | |
356 | * cacheline. This can be beneficial if you're counting cycles as closely | |
357 | * as davem. | |
358 | */ | |
2633d7a0 | 359 | struct kmem_cache * |
794b1248 VD |
360 | kmem_cache_create(const char *name, size_t size, size_t align, |
361 | unsigned long flags, void (*ctor)(void *)) | |
77be4b13 | 362 | { |
794b1248 VD |
363 | struct kmem_cache *s; |
364 | char *cache_name; | |
3965fc36 | 365 | int err; |
039363f3 | 366 | |
77be4b13 | 367 | get_online_cpus(); |
03afc0e2 | 368 | get_online_mems(); |
05257a1a | 369 | memcg_get_cache_ids(); |
03afc0e2 | 370 | |
77be4b13 | 371 | mutex_lock(&slab_mutex); |
686d550d | 372 | |
794b1248 | 373 | err = kmem_cache_sanity_check(name, size); |
3aa24f51 AM |
374 | if (err) { |
375 | s = NULL; /* suppress uninit var warning */ | |
3965fc36 | 376 | goto out_unlock; |
3aa24f51 | 377 | } |
686d550d | 378 | |
d8843922 GC |
379 | /* |
380 | * Some allocators will constraint the set of valid flags to a subset | |
381 | * of all flags. We expect them to define CACHE_CREATE_MASK in this | |
382 | * case, and we'll just provide them with a sanitized version of the | |
383 | * passed flags. | |
384 | */ | |
385 | flags &= CACHE_CREATE_MASK; | |
686d550d | 386 | |
794b1248 VD |
387 | s = __kmem_cache_alias(name, size, align, flags, ctor); |
388 | if (s) | |
3965fc36 | 389 | goto out_unlock; |
2633d7a0 | 390 | |
794b1248 VD |
391 | cache_name = kstrdup(name, GFP_KERNEL); |
392 | if (!cache_name) { | |
393 | err = -ENOMEM; | |
394 | goto out_unlock; | |
395 | } | |
7c9adf5a | 396 | |
794b1248 VD |
397 | s = do_kmem_cache_create(cache_name, size, size, |
398 | calculate_alignment(flags, align, size), | |
399 | flags, ctor, NULL, NULL); | |
400 | if (IS_ERR(s)) { | |
401 | err = PTR_ERR(s); | |
402 | kfree(cache_name); | |
403 | } | |
3965fc36 VD |
404 | |
405 | out_unlock: | |
20cea968 | 406 | mutex_unlock(&slab_mutex); |
03afc0e2 | 407 | |
05257a1a | 408 | memcg_put_cache_ids(); |
03afc0e2 | 409 | put_online_mems(); |
20cea968 CL |
410 | put_online_cpus(); |
411 | ||
ba3253c7 | 412 | if (err) { |
686d550d CL |
413 | if (flags & SLAB_PANIC) |
414 | panic("kmem_cache_create: Failed to create slab '%s'. Error %d\n", | |
415 | name, err); | |
416 | else { | |
417 | printk(KERN_WARNING "kmem_cache_create(%s) failed with error %d", | |
418 | name, err); | |
419 | dump_stack(); | |
420 | } | |
686d550d CL |
421 | return NULL; |
422 | } | |
039363f3 CL |
423 | return s; |
424 | } | |
794b1248 | 425 | EXPORT_SYMBOL(kmem_cache_create); |
2633d7a0 | 426 | |
d5b3cf71 VD |
427 | static int do_kmem_cache_shutdown(struct kmem_cache *s, |
428 | struct list_head *release, bool *need_rcu_barrier) | |
429 | { | |
430 | if (__kmem_cache_shutdown(s) != 0) { | |
431 | printk(KERN_ERR "kmem_cache_destroy %s: " | |
432 | "Slab cache still has objects\n", s->name); | |
433 | dump_stack(); | |
434 | return -EBUSY; | |
435 | } | |
436 | ||
437 | if (s->flags & SLAB_DESTROY_BY_RCU) | |
438 | *need_rcu_barrier = true; | |
439 | ||
440 | #ifdef CONFIG_MEMCG_KMEM | |
441 | if (!is_root_cache(s)) { | |
442 | struct kmem_cache *root_cache = s->memcg_params->root_cache; | |
443 | int memcg_id = memcg_cache_id(s->memcg_params->memcg); | |
444 | ||
445 | BUG_ON(root_cache->memcg_params->memcg_caches[memcg_id] != s); | |
446 | root_cache->memcg_params->memcg_caches[memcg_id] = NULL; | |
447 | } | |
448 | #endif | |
449 | list_move(&s->list, release); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | static void do_kmem_cache_release(struct list_head *release, | |
454 | bool need_rcu_barrier) | |
455 | { | |
456 | struct kmem_cache *s, *s2; | |
457 | ||
458 | if (need_rcu_barrier) | |
459 | rcu_barrier(); | |
460 | ||
461 | list_for_each_entry_safe(s, s2, release, list) { | |
462 | #ifdef SLAB_SUPPORTS_SYSFS | |
463 | sysfs_slab_remove(s); | |
464 | #else | |
465 | slab_kmem_cache_release(s); | |
466 | #endif | |
467 | } | |
468 | } | |
469 | ||
794b1248 VD |
470 | #ifdef CONFIG_MEMCG_KMEM |
471 | /* | |
776ed0f0 | 472 | * memcg_create_kmem_cache - Create a cache for a memory cgroup. |
794b1248 VD |
473 | * @memcg: The memory cgroup the new cache is for. |
474 | * @root_cache: The parent of the new cache. | |
475 | * | |
476 | * This function attempts to create a kmem cache that will serve allocation | |
477 | * requests going from @memcg to @root_cache. The new cache inherits properties | |
478 | * from its parent. | |
479 | */ | |
d5b3cf71 VD |
480 | void memcg_create_kmem_cache(struct mem_cgroup *memcg, |
481 | struct kmem_cache *root_cache) | |
2633d7a0 | 482 | { |
3e0350a3 | 483 | static char memcg_name_buf[NAME_MAX + 1]; /* protected by slab_mutex */ |
d5b3cf71 | 484 | int memcg_id = memcg_cache_id(memcg); |
bd673145 | 485 | struct kmem_cache *s = NULL; |
794b1248 VD |
486 | char *cache_name; |
487 | ||
488 | get_online_cpus(); | |
03afc0e2 VD |
489 | get_online_mems(); |
490 | ||
794b1248 VD |
491 | mutex_lock(&slab_mutex); |
492 | ||
d5b3cf71 VD |
493 | /* |
494 | * Since per-memcg caches are created asynchronously on first | |
495 | * allocation (see memcg_kmem_get_cache()), several threads can try to | |
496 | * create the same cache, but only one of them may succeed. | |
497 | */ | |
498 | if (cache_from_memcg_idx(root_cache, memcg_id)) | |
499 | goto out_unlock; | |
500 | ||
3e0350a3 VD |
501 | cgroup_name(mem_cgroup_css(memcg)->cgroup, |
502 | memcg_name_buf, sizeof(memcg_name_buf)); | |
073ee1c6 | 503 | cache_name = kasprintf(GFP_KERNEL, "%s(%d:%s)", root_cache->name, |
3e0350a3 | 504 | memcg_cache_id(memcg), memcg_name_buf); |
794b1248 VD |
505 | if (!cache_name) |
506 | goto out_unlock; | |
507 | ||
508 | s = do_kmem_cache_create(cache_name, root_cache->object_size, | |
509 | root_cache->size, root_cache->align, | |
510 | root_cache->flags, root_cache->ctor, | |
511 | memcg, root_cache); | |
d5b3cf71 VD |
512 | /* |
513 | * If we could not create a memcg cache, do not complain, because | |
514 | * that's not critical at all as we can always proceed with the root | |
515 | * cache. | |
516 | */ | |
bd673145 | 517 | if (IS_ERR(s)) { |
794b1248 | 518 | kfree(cache_name); |
d5b3cf71 | 519 | goto out_unlock; |
bd673145 | 520 | } |
794b1248 | 521 | |
d5b3cf71 VD |
522 | /* |
523 | * Since readers won't lock (see cache_from_memcg_idx()), we need a | |
524 | * barrier here to ensure nobody will see the kmem_cache partially | |
525 | * initialized. | |
526 | */ | |
527 | smp_wmb(); | |
528 | root_cache->memcg_params->memcg_caches[memcg_id] = s; | |
529 | ||
794b1248 VD |
530 | out_unlock: |
531 | mutex_unlock(&slab_mutex); | |
03afc0e2 VD |
532 | |
533 | put_online_mems(); | |
794b1248 | 534 | put_online_cpus(); |
2633d7a0 | 535 | } |
b8529907 | 536 | |
d5b3cf71 | 537 | void memcg_destroy_kmem_caches(struct mem_cgroup *memcg) |
b8529907 | 538 | { |
d5b3cf71 VD |
539 | LIST_HEAD(release); |
540 | bool need_rcu_barrier = false; | |
541 | struct kmem_cache *s, *s2; | |
b8529907 | 542 | |
d5b3cf71 VD |
543 | get_online_cpus(); |
544 | get_online_mems(); | |
b8529907 | 545 | |
b8529907 | 546 | mutex_lock(&slab_mutex); |
d5b3cf71 VD |
547 | list_for_each_entry_safe(s, s2, &slab_caches, list) { |
548 | if (is_root_cache(s) || s->memcg_params->memcg != memcg) | |
549 | continue; | |
550 | /* | |
551 | * The cgroup is about to be freed and therefore has no charges | |
552 | * left. Hence, all its caches must be empty by now. | |
553 | */ | |
554 | BUG_ON(do_kmem_cache_shutdown(s, &release, &need_rcu_barrier)); | |
555 | } | |
556 | mutex_unlock(&slab_mutex); | |
b8529907 | 557 | |
d5b3cf71 VD |
558 | put_online_mems(); |
559 | put_online_cpus(); | |
560 | ||
561 | do_kmem_cache_release(&release, need_rcu_barrier); | |
b8529907 | 562 | } |
794b1248 | 563 | #endif /* CONFIG_MEMCG_KMEM */ |
97d06609 | 564 | |
41a21285 CL |
565 | void slab_kmem_cache_release(struct kmem_cache *s) |
566 | { | |
d5b3cf71 | 567 | memcg_free_cache_params(s); |
41a21285 CL |
568 | kfree(s->name); |
569 | kmem_cache_free(kmem_cache, s); | |
570 | } | |
571 | ||
945cf2b6 CL |
572 | void kmem_cache_destroy(struct kmem_cache *s) |
573 | { | |
d5b3cf71 VD |
574 | int i; |
575 | LIST_HEAD(release); | |
576 | bool need_rcu_barrier = false; | |
577 | bool busy = false; | |
578 | ||
945cf2b6 | 579 | get_online_cpus(); |
03afc0e2 VD |
580 | get_online_mems(); |
581 | ||
945cf2b6 | 582 | mutex_lock(&slab_mutex); |
b8529907 | 583 | |
945cf2b6 | 584 | s->refcount--; |
b8529907 VD |
585 | if (s->refcount) |
586 | goto out_unlock; | |
587 | ||
d5b3cf71 VD |
588 | for_each_memcg_cache_index(i) { |
589 | struct kmem_cache *c = cache_from_memcg_idx(s, i); | |
b8529907 | 590 | |
d5b3cf71 VD |
591 | if (c && do_kmem_cache_shutdown(c, &release, &need_rcu_barrier)) |
592 | busy = true; | |
945cf2b6 | 593 | } |
b8529907 | 594 | |
d5b3cf71 VD |
595 | if (!busy) |
596 | do_kmem_cache_shutdown(s, &release, &need_rcu_barrier); | |
b8529907 VD |
597 | |
598 | out_unlock: | |
599 | mutex_unlock(&slab_mutex); | |
d5b3cf71 | 600 | |
03afc0e2 | 601 | put_online_mems(); |
945cf2b6 | 602 | put_online_cpus(); |
d5b3cf71 VD |
603 | |
604 | do_kmem_cache_release(&release, need_rcu_barrier); | |
945cf2b6 CL |
605 | } |
606 | EXPORT_SYMBOL(kmem_cache_destroy); | |
607 | ||
03afc0e2 VD |
608 | /** |
609 | * kmem_cache_shrink - Shrink a cache. | |
610 | * @cachep: The cache to shrink. | |
611 | * | |
612 | * Releases as many slabs as possible for a cache. | |
613 | * To help debugging, a zero exit status indicates all slabs were released. | |
614 | */ | |
615 | int kmem_cache_shrink(struct kmem_cache *cachep) | |
616 | { | |
617 | int ret; | |
618 | ||
619 | get_online_cpus(); | |
620 | get_online_mems(); | |
621 | ret = __kmem_cache_shrink(cachep); | |
622 | put_online_mems(); | |
623 | put_online_cpus(); | |
624 | return ret; | |
625 | } | |
626 | EXPORT_SYMBOL(kmem_cache_shrink); | |
627 | ||
97d06609 CL |
628 | int slab_is_available(void) |
629 | { | |
630 | return slab_state >= UP; | |
631 | } | |
b7454ad3 | 632 | |
45530c44 CL |
633 | #ifndef CONFIG_SLOB |
634 | /* Create a cache during boot when no slab services are available yet */ | |
635 | void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t size, | |
636 | unsigned long flags) | |
637 | { | |
638 | int err; | |
639 | ||
640 | s->name = name; | |
641 | s->size = s->object_size = size; | |
45906855 | 642 | s->align = calculate_alignment(flags, ARCH_KMALLOC_MINALIGN, size); |
45530c44 CL |
643 | err = __kmem_cache_create(s, flags); |
644 | ||
645 | if (err) | |
31ba7346 | 646 | panic("Creation of kmalloc slab %s size=%zu failed. Reason %d\n", |
45530c44 CL |
647 | name, size, err); |
648 | ||
649 | s->refcount = -1; /* Exempt from merging for now */ | |
650 | } | |
651 | ||
652 | struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size, | |
653 | unsigned long flags) | |
654 | { | |
655 | struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); | |
656 | ||
657 | if (!s) | |
658 | panic("Out of memory when creating slab %s\n", name); | |
659 | ||
660 | create_boot_cache(s, name, size, flags); | |
661 | list_add(&s->list, &slab_caches); | |
662 | s->refcount = 1; | |
663 | return s; | |
664 | } | |
665 | ||
9425c58e CL |
666 | struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; |
667 | EXPORT_SYMBOL(kmalloc_caches); | |
668 | ||
669 | #ifdef CONFIG_ZONE_DMA | |
670 | struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1]; | |
671 | EXPORT_SYMBOL(kmalloc_dma_caches); | |
672 | #endif | |
673 | ||
2c59dd65 CL |
674 | /* |
675 | * Conversion table for small slabs sizes / 8 to the index in the | |
676 | * kmalloc array. This is necessary for slabs < 192 since we have non power | |
677 | * of two cache sizes there. The size of larger slabs can be determined using | |
678 | * fls. | |
679 | */ | |
680 | static s8 size_index[24] = { | |
681 | 3, /* 8 */ | |
682 | 4, /* 16 */ | |
683 | 5, /* 24 */ | |
684 | 5, /* 32 */ | |
685 | 6, /* 40 */ | |
686 | 6, /* 48 */ | |
687 | 6, /* 56 */ | |
688 | 6, /* 64 */ | |
689 | 1, /* 72 */ | |
690 | 1, /* 80 */ | |
691 | 1, /* 88 */ | |
692 | 1, /* 96 */ | |
693 | 7, /* 104 */ | |
694 | 7, /* 112 */ | |
695 | 7, /* 120 */ | |
696 | 7, /* 128 */ | |
697 | 2, /* 136 */ | |
698 | 2, /* 144 */ | |
699 | 2, /* 152 */ | |
700 | 2, /* 160 */ | |
701 | 2, /* 168 */ | |
702 | 2, /* 176 */ | |
703 | 2, /* 184 */ | |
704 | 2 /* 192 */ | |
705 | }; | |
706 | ||
707 | static inline int size_index_elem(size_t bytes) | |
708 | { | |
709 | return (bytes - 1) / 8; | |
710 | } | |
711 | ||
712 | /* | |
713 | * Find the kmem_cache structure that serves a given size of | |
714 | * allocation | |
715 | */ | |
716 | struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags) | |
717 | { | |
718 | int index; | |
719 | ||
9de1bc87 | 720 | if (unlikely(size > KMALLOC_MAX_SIZE)) { |
907985f4 | 721 | WARN_ON_ONCE(!(flags & __GFP_NOWARN)); |
6286ae97 | 722 | return NULL; |
907985f4 | 723 | } |
6286ae97 | 724 | |
2c59dd65 CL |
725 | if (size <= 192) { |
726 | if (!size) | |
727 | return ZERO_SIZE_PTR; | |
728 | ||
729 | index = size_index[size_index_elem(size)]; | |
730 | } else | |
731 | index = fls(size - 1); | |
732 | ||
733 | #ifdef CONFIG_ZONE_DMA | |
b1e05416 | 734 | if (unlikely((flags & GFP_DMA))) |
2c59dd65 CL |
735 | return kmalloc_dma_caches[index]; |
736 | ||
737 | #endif | |
738 | return kmalloc_caches[index]; | |
739 | } | |
740 | ||
f97d5f63 CL |
741 | /* |
742 | * Create the kmalloc array. Some of the regular kmalloc arrays | |
743 | * may already have been created because they were needed to | |
744 | * enable allocations for slab creation. | |
745 | */ | |
746 | void __init create_kmalloc_caches(unsigned long flags) | |
747 | { | |
748 | int i; | |
749 | ||
2c59dd65 CL |
750 | /* |
751 | * Patch up the size_index table if we have strange large alignment | |
752 | * requirements for the kmalloc array. This is only the case for | |
753 | * MIPS it seems. The standard arches will not generate any code here. | |
754 | * | |
755 | * Largest permitted alignment is 256 bytes due to the way we | |
756 | * handle the index determination for the smaller caches. | |
757 | * | |
758 | * Make sure that nothing crazy happens if someone starts tinkering | |
759 | * around with ARCH_KMALLOC_MINALIGN | |
760 | */ | |
761 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 256 || | |
762 | (KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1))); | |
763 | ||
764 | for (i = 8; i < KMALLOC_MIN_SIZE; i += 8) { | |
765 | int elem = size_index_elem(i); | |
766 | ||
767 | if (elem >= ARRAY_SIZE(size_index)) | |
768 | break; | |
769 | size_index[elem] = KMALLOC_SHIFT_LOW; | |
770 | } | |
771 | ||
772 | if (KMALLOC_MIN_SIZE >= 64) { | |
773 | /* | |
774 | * The 96 byte size cache is not used if the alignment | |
775 | * is 64 byte. | |
776 | */ | |
777 | for (i = 64 + 8; i <= 96; i += 8) | |
778 | size_index[size_index_elem(i)] = 7; | |
779 | ||
780 | } | |
781 | ||
782 | if (KMALLOC_MIN_SIZE >= 128) { | |
783 | /* | |
784 | * The 192 byte sized cache is not used if the alignment | |
785 | * is 128 byte. Redirect kmalloc to use the 256 byte cache | |
786 | * instead. | |
787 | */ | |
788 | for (i = 128 + 8; i <= 192; i += 8) | |
789 | size_index[size_index_elem(i)] = 8; | |
790 | } | |
8a965b3b CL |
791 | for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) { |
792 | if (!kmalloc_caches[i]) { | |
f97d5f63 CL |
793 | kmalloc_caches[i] = create_kmalloc_cache(NULL, |
794 | 1 << i, flags); | |
956e46ef | 795 | } |
f97d5f63 | 796 | |
956e46ef CM |
797 | /* |
798 | * Caches that are not of the two-to-the-power-of size. | |
799 | * These have to be created immediately after the | |
800 | * earlier power of two caches | |
801 | */ | |
802 | if (KMALLOC_MIN_SIZE <= 32 && !kmalloc_caches[1] && i == 6) | |
803 | kmalloc_caches[1] = create_kmalloc_cache(NULL, 96, flags); | |
8a965b3b | 804 | |
956e46ef CM |
805 | if (KMALLOC_MIN_SIZE <= 64 && !kmalloc_caches[2] && i == 7) |
806 | kmalloc_caches[2] = create_kmalloc_cache(NULL, 192, flags); | |
8a965b3b CL |
807 | } |
808 | ||
f97d5f63 CL |
809 | /* Kmalloc array is now usable */ |
810 | slab_state = UP; | |
811 | ||
812 | for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) { | |
813 | struct kmem_cache *s = kmalloc_caches[i]; | |
814 | char *n; | |
815 | ||
816 | if (s) { | |
817 | n = kasprintf(GFP_NOWAIT, "kmalloc-%d", kmalloc_size(i)); | |
818 | ||
819 | BUG_ON(!n); | |
820 | s->name = n; | |
821 | } | |
822 | } | |
823 | ||
824 | #ifdef CONFIG_ZONE_DMA | |
825 | for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) { | |
826 | struct kmem_cache *s = kmalloc_caches[i]; | |
827 | ||
828 | if (s) { | |
829 | int size = kmalloc_size(i); | |
830 | char *n = kasprintf(GFP_NOWAIT, | |
831 | "dma-kmalloc-%d", size); | |
832 | ||
833 | BUG_ON(!n); | |
834 | kmalloc_dma_caches[i] = create_kmalloc_cache(n, | |
835 | size, SLAB_CACHE_DMA | flags); | |
836 | } | |
837 | } | |
838 | #endif | |
839 | } | |
45530c44 CL |
840 | #endif /* !CONFIG_SLOB */ |
841 | ||
cea371f4 VD |
842 | /* |
843 | * To avoid unnecessary overhead, we pass through large allocation requests | |
844 | * directly to the page allocator. We use __GFP_COMP, because we will need to | |
845 | * know the allocation order to free the pages properly in kfree. | |
846 | */ | |
52383431 VD |
847 | void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) |
848 | { | |
849 | void *ret; | |
850 | struct page *page; | |
851 | ||
852 | flags |= __GFP_COMP; | |
853 | page = alloc_kmem_pages(flags, order); | |
854 | ret = page ? page_address(page) : NULL; | |
855 | kmemleak_alloc(ret, size, 1, flags); | |
856 | return ret; | |
857 | } | |
858 | EXPORT_SYMBOL(kmalloc_order); | |
859 | ||
f1b6eb6e CL |
860 | #ifdef CONFIG_TRACING |
861 | void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) | |
862 | { | |
863 | void *ret = kmalloc_order(size, flags, order); | |
864 | trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << order, flags); | |
865 | return ret; | |
866 | } | |
867 | EXPORT_SYMBOL(kmalloc_order_trace); | |
868 | #endif | |
45530c44 | 869 | |
b7454ad3 | 870 | #ifdef CONFIG_SLABINFO |
e9b4db2b WL |
871 | |
872 | #ifdef CONFIG_SLAB | |
873 | #define SLABINFO_RIGHTS (S_IWUSR | S_IRUSR) | |
874 | #else | |
875 | #define SLABINFO_RIGHTS S_IRUSR | |
876 | #endif | |
877 | ||
b047501c | 878 | static void print_slabinfo_header(struct seq_file *m) |
bcee6e2a GC |
879 | { |
880 | /* | |
881 | * Output format version, so at least we can change it | |
882 | * without _too_ many complaints. | |
883 | */ | |
884 | #ifdef CONFIG_DEBUG_SLAB | |
885 | seq_puts(m, "slabinfo - version: 2.1 (statistics)\n"); | |
886 | #else | |
887 | seq_puts(m, "slabinfo - version: 2.1\n"); | |
888 | #endif | |
889 | seq_puts(m, "# name <active_objs> <num_objs> <objsize> " | |
890 | "<objperslab> <pagesperslab>"); | |
891 | seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>"); | |
892 | seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); | |
893 | #ifdef CONFIG_DEBUG_SLAB | |
894 | seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> " | |
895 | "<error> <maxfreeable> <nodeallocs> <remotefrees> <alienoverflow>"); | |
896 | seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>"); | |
897 | #endif | |
898 | seq_putc(m, '\n'); | |
899 | } | |
900 | ||
1df3b26f | 901 | void *slab_start(struct seq_file *m, loff_t *pos) |
b7454ad3 | 902 | { |
b7454ad3 | 903 | mutex_lock(&slab_mutex); |
b7454ad3 GC |
904 | return seq_list_start(&slab_caches, *pos); |
905 | } | |
906 | ||
276a2439 | 907 | void *slab_next(struct seq_file *m, void *p, loff_t *pos) |
b7454ad3 GC |
908 | { |
909 | return seq_list_next(p, &slab_caches, pos); | |
910 | } | |
911 | ||
276a2439 | 912 | void slab_stop(struct seq_file *m, void *p) |
b7454ad3 GC |
913 | { |
914 | mutex_unlock(&slab_mutex); | |
915 | } | |
916 | ||
749c5415 GC |
917 | static void |
918 | memcg_accumulate_slabinfo(struct kmem_cache *s, struct slabinfo *info) | |
919 | { | |
920 | struct kmem_cache *c; | |
921 | struct slabinfo sinfo; | |
922 | int i; | |
923 | ||
924 | if (!is_root_cache(s)) | |
925 | return; | |
926 | ||
927 | for_each_memcg_cache_index(i) { | |
2ade4de8 | 928 | c = cache_from_memcg_idx(s, i); |
749c5415 GC |
929 | if (!c) |
930 | continue; | |
931 | ||
932 | memset(&sinfo, 0, sizeof(sinfo)); | |
933 | get_slabinfo(c, &sinfo); | |
934 | ||
935 | info->active_slabs += sinfo.active_slabs; | |
936 | info->num_slabs += sinfo.num_slabs; | |
937 | info->shared_avail += sinfo.shared_avail; | |
938 | info->active_objs += sinfo.active_objs; | |
939 | info->num_objs += sinfo.num_objs; | |
940 | } | |
941 | } | |
942 | ||
b047501c | 943 | static void cache_show(struct kmem_cache *s, struct seq_file *m) |
b7454ad3 | 944 | { |
0d7561c6 GC |
945 | struct slabinfo sinfo; |
946 | ||
947 | memset(&sinfo, 0, sizeof(sinfo)); | |
948 | get_slabinfo(s, &sinfo); | |
949 | ||
749c5415 GC |
950 | memcg_accumulate_slabinfo(s, &sinfo); |
951 | ||
0d7561c6 | 952 | seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", |
749c5415 | 953 | cache_name(s), sinfo.active_objs, sinfo.num_objs, s->size, |
0d7561c6 GC |
954 | sinfo.objects_per_slab, (1 << sinfo.cache_order)); |
955 | ||
956 | seq_printf(m, " : tunables %4u %4u %4u", | |
957 | sinfo.limit, sinfo.batchcount, sinfo.shared); | |
958 | seq_printf(m, " : slabdata %6lu %6lu %6lu", | |
959 | sinfo.active_slabs, sinfo.num_slabs, sinfo.shared_avail); | |
960 | slabinfo_show_stats(m, s); | |
961 | seq_putc(m, '\n'); | |
b7454ad3 GC |
962 | } |
963 | ||
1df3b26f | 964 | static int slab_show(struct seq_file *m, void *p) |
749c5415 GC |
965 | { |
966 | struct kmem_cache *s = list_entry(p, struct kmem_cache, list); | |
967 | ||
1df3b26f VD |
968 | if (p == slab_caches.next) |
969 | print_slabinfo_header(m); | |
b047501c VD |
970 | if (is_root_cache(s)) |
971 | cache_show(s, m); | |
972 | return 0; | |
973 | } | |
974 | ||
975 | #ifdef CONFIG_MEMCG_KMEM | |
976 | int memcg_slab_show(struct seq_file *m, void *p) | |
977 | { | |
978 | struct kmem_cache *s = list_entry(p, struct kmem_cache, list); | |
979 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); | |
980 | ||
981 | if (p == slab_caches.next) | |
982 | print_slabinfo_header(m); | |
983 | if (!is_root_cache(s) && s->memcg_params->memcg == memcg) | |
984 | cache_show(s, m); | |
985 | return 0; | |
749c5415 | 986 | } |
b047501c | 987 | #endif |
749c5415 | 988 | |
b7454ad3 GC |
989 | /* |
990 | * slabinfo_op - iterator that generates /proc/slabinfo | |
991 | * | |
992 | * Output layout: | |
993 | * cache-name | |
994 | * num-active-objs | |
995 | * total-objs | |
996 | * object size | |
997 | * num-active-slabs | |
998 | * total-slabs | |
999 | * num-pages-per-slab | |
1000 | * + further values on SMP and with statistics enabled | |
1001 | */ | |
1002 | static const struct seq_operations slabinfo_op = { | |
1df3b26f | 1003 | .start = slab_start, |
276a2439 WL |
1004 | .next = slab_next, |
1005 | .stop = slab_stop, | |
1df3b26f | 1006 | .show = slab_show, |
b7454ad3 GC |
1007 | }; |
1008 | ||
1009 | static int slabinfo_open(struct inode *inode, struct file *file) | |
1010 | { | |
1011 | return seq_open(file, &slabinfo_op); | |
1012 | } | |
1013 | ||
1014 | static const struct file_operations proc_slabinfo_operations = { | |
1015 | .open = slabinfo_open, | |
1016 | .read = seq_read, | |
1017 | .write = slabinfo_write, | |
1018 | .llseek = seq_lseek, | |
1019 | .release = seq_release, | |
1020 | }; | |
1021 | ||
1022 | static int __init slab_proc_init(void) | |
1023 | { | |
e9b4db2b WL |
1024 | proc_create("slabinfo", SLABINFO_RIGHTS, NULL, |
1025 | &proc_slabinfo_operations); | |
b7454ad3 GC |
1026 | return 0; |
1027 | } | |
1028 | module_init(slab_proc_init); | |
1029 | #endif /* CONFIG_SLABINFO */ | |
928cec9c AR |
1030 | |
1031 | static __always_inline void *__do_krealloc(const void *p, size_t new_size, | |
1032 | gfp_t flags) | |
1033 | { | |
1034 | void *ret; | |
1035 | size_t ks = 0; | |
1036 | ||
1037 | if (p) | |
1038 | ks = ksize(p); | |
1039 | ||
1040 | if (ks >= new_size) | |
1041 | return (void *)p; | |
1042 | ||
1043 | ret = kmalloc_track_caller(new_size, flags); | |
1044 | if (ret && p) | |
1045 | memcpy(ret, p, ks); | |
1046 | ||
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * __krealloc - like krealloc() but don't free @p. | |
1052 | * @p: object to reallocate memory for. | |
1053 | * @new_size: how many bytes of memory are required. | |
1054 | * @flags: the type of memory to allocate. | |
1055 | * | |
1056 | * This function is like krealloc() except it never frees the originally | |
1057 | * allocated buffer. Use this if you don't want to free the buffer immediately | |
1058 | * like, for example, with RCU. | |
1059 | */ | |
1060 | void *__krealloc(const void *p, size_t new_size, gfp_t flags) | |
1061 | { | |
1062 | if (unlikely(!new_size)) | |
1063 | return ZERO_SIZE_PTR; | |
1064 | ||
1065 | return __do_krealloc(p, new_size, flags); | |
1066 | ||
1067 | } | |
1068 | EXPORT_SYMBOL(__krealloc); | |
1069 | ||
1070 | /** | |
1071 | * krealloc - reallocate memory. The contents will remain unchanged. | |
1072 | * @p: object to reallocate memory for. | |
1073 | * @new_size: how many bytes of memory are required. | |
1074 | * @flags: the type of memory to allocate. | |
1075 | * | |
1076 | * The contents of the object pointed to are preserved up to the | |
1077 | * lesser of the new and old sizes. If @p is %NULL, krealloc() | |
1078 | * behaves exactly like kmalloc(). If @new_size is 0 and @p is not a | |
1079 | * %NULL pointer, the object pointed to is freed. | |
1080 | */ | |
1081 | void *krealloc(const void *p, size_t new_size, gfp_t flags) | |
1082 | { | |
1083 | void *ret; | |
1084 | ||
1085 | if (unlikely(!new_size)) { | |
1086 | kfree(p); | |
1087 | return ZERO_SIZE_PTR; | |
1088 | } | |
1089 | ||
1090 | ret = __do_krealloc(p, new_size, flags); | |
1091 | if (ret && p != ret) | |
1092 | kfree(p); | |
1093 | ||
1094 | return ret; | |
1095 | } | |
1096 | EXPORT_SYMBOL(krealloc); | |
1097 | ||
1098 | /** | |
1099 | * kzfree - like kfree but zero memory | |
1100 | * @p: object to free memory of | |
1101 | * | |
1102 | * The memory of the object @p points to is zeroed before freed. | |
1103 | * If @p is %NULL, kzfree() does nothing. | |
1104 | * | |
1105 | * Note: this function zeroes the whole allocated buffer which can be a good | |
1106 | * deal bigger than the requested buffer size passed to kmalloc(). So be | |
1107 | * careful when using this function in performance sensitive code. | |
1108 | */ | |
1109 | void kzfree(const void *p) | |
1110 | { | |
1111 | size_t ks; | |
1112 | void *mem = (void *)p; | |
1113 | ||
1114 | if (unlikely(ZERO_OR_NULL_PTR(mem))) | |
1115 | return; | |
1116 | ks = ksize(mem); | |
1117 | memset(mem, 0, ks); | |
1118 | kfree(mem); | |
1119 | } | |
1120 | EXPORT_SYMBOL(kzfree); | |
1121 | ||
1122 | /* Tracepoints definitions. */ | |
1123 | EXPORT_TRACEPOINT_SYMBOL(kmalloc); | |
1124 | EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc); | |
1125 | EXPORT_TRACEPOINT_SYMBOL(kmalloc_node); | |
1126 | EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc_node); | |
1127 | EXPORT_TRACEPOINT_SYMBOL(kfree); | |
1128 | EXPORT_TRACEPOINT_SYMBOL(kmem_cache_free); |