Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/mm/slab.c | |
3 | * Written by Mark Hemment, 1996/97. | |
4 | * (markhe@nextd.demon.co.uk) | |
5 | * | |
6 | * kmem_cache_destroy() + some cleanup - 1999 Andrea Arcangeli | |
7 | * | |
8 | * Major cleanup, different bufctl logic, per-cpu arrays | |
9 | * (c) 2000 Manfred Spraul | |
10 | * | |
11 | * Cleanup, make the head arrays unconditional, preparation for NUMA | |
12 | * (c) 2002 Manfred Spraul | |
13 | * | |
14 | * An implementation of the Slab Allocator as described in outline in; | |
15 | * UNIX Internals: The New Frontiers by Uresh Vahalia | |
16 | * Pub: Prentice Hall ISBN 0-13-101908-2 | |
17 | * or with a little more detail in; | |
18 | * The Slab Allocator: An Object-Caching Kernel Memory Allocator | |
19 | * Jeff Bonwick (Sun Microsystems). | |
20 | * Presented at: USENIX Summer 1994 Technical Conference | |
21 | * | |
22 | * The memory is organized in caches, one cache for each object type. | |
23 | * (e.g. inode_cache, dentry_cache, buffer_head, vm_area_struct) | |
24 | * Each cache consists out of many slabs (they are small (usually one | |
25 | * page long) and always contiguous), and each slab contains multiple | |
26 | * initialized objects. | |
27 | * | |
28 | * This means, that your constructor is used only for newly allocated | |
183ff22b | 29 | * slabs and you must pass objects with the same initializations to |
1da177e4 LT |
30 | * kmem_cache_free. |
31 | * | |
32 | * Each cache can only support one memory type (GFP_DMA, GFP_HIGHMEM, | |
33 | * normal). If you need a special memory type, then must create a new | |
34 | * cache for that memory type. | |
35 | * | |
36 | * In order to reduce fragmentation, the slabs are sorted in 3 groups: | |
37 | * full slabs with 0 free objects | |
38 | * partial slabs | |
39 | * empty slabs with no allocated objects | |
40 | * | |
41 | * If partial slabs exist, then new allocations come from these slabs, | |
42 | * otherwise from empty slabs or new slabs are allocated. | |
43 | * | |
44 | * kmem_cache_destroy() CAN CRASH if you try to allocate from the cache | |
45 | * during kmem_cache_destroy(). The caller must prevent concurrent allocs. | |
46 | * | |
47 | * Each cache has a short per-cpu head array, most allocs | |
48 | * and frees go into that array, and if that array overflows, then 1/2 | |
49 | * of the entries in the array are given back into the global cache. | |
50 | * The head array is strictly LIFO and should improve the cache hit rates. | |
51 | * On SMP, it additionally reduces the spinlock operations. | |
52 | * | |
a737b3e2 | 53 | * The c_cpuarray may not be read with enabled local interrupts - |
1da177e4 LT |
54 | * it's changed with a smp_call_function(). |
55 | * | |
56 | * SMP synchronization: | |
57 | * constructors and destructors are called without any locking. | |
343e0d7a | 58 | * Several members in struct kmem_cache and struct slab never change, they |
1da177e4 LT |
59 | * are accessed without any locking. |
60 | * The per-cpu arrays are never accessed from the wrong cpu, no locking, | |
61 | * and local interrupts are disabled so slab code is preempt-safe. | |
62 | * The non-constant members are protected with a per-cache irq spinlock. | |
63 | * | |
64 | * Many thanks to Mark Hemment, who wrote another per-cpu slab patch | |
65 | * in 2000 - many ideas in the current implementation are derived from | |
66 | * his patch. | |
67 | * | |
68 | * Further notes from the original documentation: | |
69 | * | |
70 | * 11 April '97. Started multi-threading - markhe | |
18004c5d | 71 | * The global cache-chain is protected by the mutex 'slab_mutex'. |
1da177e4 LT |
72 | * The sem is only needed when accessing/extending the cache-chain, which |
73 | * can never happen inside an interrupt (kmem_cache_create(), | |
74 | * kmem_cache_shrink() and kmem_cache_reap()). | |
75 | * | |
76 | * At present, each engine can be growing a cache. This should be blocked. | |
77 | * | |
e498be7d CL |
78 | * 15 March 2005. NUMA slab allocator. |
79 | * Shai Fultheim <shai@scalex86.org>. | |
80 | * Shobhit Dayal <shobhit@calsoftinc.com> | |
81 | * Alok N Kataria <alokk@calsoftinc.com> | |
82 | * Christoph Lameter <christoph@lameter.com> | |
83 | * | |
84 | * Modified the slab allocator to be node aware on NUMA systems. | |
85 | * Each node has its own list of partial, free and full slabs. | |
86 | * All object allocations for a node occur from node specific slab lists. | |
1da177e4 LT |
87 | */ |
88 | ||
1da177e4 | 89 | #include <linux/slab.h> |
97d06609 | 90 | #include "slab.h" |
1da177e4 | 91 | #include <linux/mm.h> |
c9cf5528 | 92 | #include <linux/poison.h> |
1da177e4 LT |
93 | #include <linux/swap.h> |
94 | #include <linux/cache.h> | |
95 | #include <linux/interrupt.h> | |
96 | #include <linux/init.h> | |
97 | #include <linux/compiler.h> | |
101a5001 | 98 | #include <linux/cpuset.h> |
a0ec95a8 | 99 | #include <linux/proc_fs.h> |
1da177e4 LT |
100 | #include <linux/seq_file.h> |
101 | #include <linux/notifier.h> | |
102 | #include <linux/kallsyms.h> | |
103 | #include <linux/cpu.h> | |
104 | #include <linux/sysctl.h> | |
105 | #include <linux/module.h> | |
106 | #include <linux/rcupdate.h> | |
543537bd | 107 | #include <linux/string.h> |
138ae663 | 108 | #include <linux/uaccess.h> |
e498be7d | 109 | #include <linux/nodemask.h> |
d5cff635 | 110 | #include <linux/kmemleak.h> |
dc85da15 | 111 | #include <linux/mempolicy.h> |
fc0abb14 | 112 | #include <linux/mutex.h> |
8a8b6502 | 113 | #include <linux/fault-inject.h> |
e7eebaf6 | 114 | #include <linux/rtmutex.h> |
6a2d7a95 | 115 | #include <linux/reciprocal_div.h> |
3ac7fe5a | 116 | #include <linux/debugobjects.h> |
c175eea4 | 117 | #include <linux/kmemcheck.h> |
8f9f8d9e | 118 | #include <linux/memory.h> |
268bb0ce | 119 | #include <linux/prefetch.h> |
1da177e4 | 120 | |
381760ea MG |
121 | #include <net/sock.h> |
122 | ||
1da177e4 LT |
123 | #include <asm/cacheflush.h> |
124 | #include <asm/tlbflush.h> | |
125 | #include <asm/page.h> | |
126 | ||
4dee6b64 SR |
127 | #include <trace/events/kmem.h> |
128 | ||
072bb0aa MG |
129 | #include "internal.h" |
130 | ||
1da177e4 | 131 | /* |
50953fe9 | 132 | * DEBUG - 1 for kmem_cache_create() to honour; SLAB_RED_ZONE & SLAB_POISON. |
1da177e4 LT |
133 | * 0 for faster, smaller code (especially in the critical paths). |
134 | * | |
135 | * STATS - 1 to collect stats for /proc/slabinfo. | |
136 | * 0 for faster, smaller code (especially in the critical paths). | |
137 | * | |
138 | * FORCED_DEBUG - 1 enables SLAB_RED_ZONE and SLAB_POISON (if possible) | |
139 | */ | |
140 | ||
141 | #ifdef CONFIG_DEBUG_SLAB | |
142 | #define DEBUG 1 | |
143 | #define STATS 1 | |
144 | #define FORCED_DEBUG 1 | |
145 | #else | |
146 | #define DEBUG 0 | |
147 | #define STATS 0 | |
148 | #define FORCED_DEBUG 0 | |
149 | #endif | |
150 | ||
1da177e4 LT |
151 | /* Shouldn't this be in a header file somewhere? */ |
152 | #define BYTES_PER_WORD sizeof(void *) | |
87a927c7 | 153 | #define REDZONE_ALIGN max(BYTES_PER_WORD, __alignof__(unsigned long long)) |
1da177e4 | 154 | |
1da177e4 LT |
155 | #ifndef ARCH_KMALLOC_FLAGS |
156 | #define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN | |
157 | #endif | |
158 | ||
072bb0aa MG |
159 | /* |
160 | * true if a page was allocated from pfmemalloc reserves for network-based | |
161 | * swap | |
162 | */ | |
163 | static bool pfmemalloc_active __read_mostly; | |
164 | ||
1da177e4 LT |
165 | /* |
166 | * kmem_bufctl_t: | |
167 | * | |
168 | * Bufctl's are used for linking objs within a slab | |
169 | * linked offsets. | |
170 | * | |
171 | * This implementation relies on "struct page" for locating the cache & | |
172 | * slab an object belongs to. | |
173 | * This allows the bufctl structure to be small (one int), but limits | |
174 | * the number of objects a slab (not a cache) can contain when off-slab | |
175 | * bufctls are used. The limit is the size of the largest general cache | |
176 | * that does not use off-slab slabs. | |
177 | * For 32bit archs with 4 kB pages, is this 56. | |
178 | * This is not serious, as it is only for large objects, when it is unwise | |
179 | * to have too many per slab. | |
180 | * Note: This limit can be raised by introducing a general cache whose size | |
181 | * is less than 512 (PAGE_SIZE<<3), but greater than 256. | |
182 | */ | |
183 | ||
fa5b08d5 | 184 | typedef unsigned int kmem_bufctl_t; |
1da177e4 LT |
185 | #define BUFCTL_END (((kmem_bufctl_t)(~0U))-0) |
186 | #define BUFCTL_FREE (((kmem_bufctl_t)(~0U))-1) | |
871751e2 AV |
187 | #define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2) |
188 | #define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3) | |
1da177e4 | 189 | |
1da177e4 LT |
190 | /* |
191 | * struct slab_rcu | |
192 | * | |
193 | * slab_destroy on a SLAB_DESTROY_BY_RCU cache uses this structure to | |
194 | * arrange for kmem_freepages to be called via RCU. This is useful if | |
195 | * we need to approach a kernel structure obliquely, from its address | |
196 | * obtained without the usual locking. We can lock the structure to | |
197 | * stabilize it and check it's still at the given address, only if we | |
198 | * can be sure that the memory has not been meanwhile reused for some | |
199 | * other kind of object (which our subsystem's lock might corrupt). | |
200 | * | |
201 | * rcu_read_lock before reading the address, then rcu_read_unlock after | |
202 | * taking the spinlock within the structure expected at that address. | |
1da177e4 LT |
203 | */ |
204 | struct slab_rcu { | |
b28a02de | 205 | struct rcu_head head; |
343e0d7a | 206 | struct kmem_cache *cachep; |
b28a02de | 207 | void *addr; |
1da177e4 LT |
208 | }; |
209 | ||
5bfe53a7 LJ |
210 | /* |
211 | * struct slab | |
212 | * | |
213 | * Manages the objs in a slab. Placed either at the beginning of mem allocated | |
214 | * for a slab, or allocated from an general cache. | |
215 | * Slabs are chained into three list: fully used, partial, fully free slabs. | |
216 | */ | |
217 | struct slab { | |
218 | union { | |
219 | struct { | |
220 | struct list_head list; | |
221 | unsigned long colouroff; | |
222 | void *s_mem; /* including colour offset */ | |
223 | unsigned int inuse; /* num of objs active in slab */ | |
224 | kmem_bufctl_t free; | |
225 | unsigned short nodeid; | |
226 | }; | |
227 | struct slab_rcu __slab_cover_slab_rcu; | |
228 | }; | |
229 | }; | |
230 | ||
1da177e4 LT |
231 | /* |
232 | * struct array_cache | |
233 | * | |
1da177e4 LT |
234 | * Purpose: |
235 | * - LIFO ordering, to hand out cache-warm objects from _alloc | |
236 | * - reduce the number of linked list operations | |
237 | * - reduce spinlock operations | |
238 | * | |
239 | * The limit is stored in the per-cpu structure to reduce the data cache | |
240 | * footprint. | |
241 | * | |
242 | */ | |
243 | struct array_cache { | |
244 | unsigned int avail; | |
245 | unsigned int limit; | |
246 | unsigned int batchcount; | |
247 | unsigned int touched; | |
e498be7d | 248 | spinlock_t lock; |
bda5b655 | 249 | void *entry[]; /* |
a737b3e2 AM |
250 | * Must have this definition in here for the proper |
251 | * alignment of array_cache. Also simplifies accessing | |
252 | * the entries. | |
072bb0aa MG |
253 | * |
254 | * Entries should not be directly dereferenced as | |
255 | * entries belonging to slabs marked pfmemalloc will | |
256 | * have the lower bits set SLAB_OBJ_PFMEMALLOC | |
a737b3e2 | 257 | */ |
1da177e4 LT |
258 | }; |
259 | ||
072bb0aa MG |
260 | #define SLAB_OBJ_PFMEMALLOC 1 |
261 | static inline bool is_obj_pfmemalloc(void *objp) | |
262 | { | |
263 | return (unsigned long)objp & SLAB_OBJ_PFMEMALLOC; | |
264 | } | |
265 | ||
266 | static inline void set_obj_pfmemalloc(void **objp) | |
267 | { | |
268 | *objp = (void *)((unsigned long)*objp | SLAB_OBJ_PFMEMALLOC); | |
269 | return; | |
270 | } | |
271 | ||
272 | static inline void clear_obj_pfmemalloc(void **objp) | |
273 | { | |
274 | *objp = (void *)((unsigned long)*objp & ~SLAB_OBJ_PFMEMALLOC); | |
275 | } | |
276 | ||
a737b3e2 AM |
277 | /* |
278 | * bootstrap: The caches do not work without cpuarrays anymore, but the | |
279 | * cpuarrays are allocated from the generic caches... | |
1da177e4 LT |
280 | */ |
281 | #define BOOT_CPUCACHE_ENTRIES 1 | |
282 | struct arraycache_init { | |
283 | struct array_cache cache; | |
b28a02de | 284 | void *entries[BOOT_CPUCACHE_ENTRIES]; |
1da177e4 LT |
285 | }; |
286 | ||
287 | /* | |
e498be7d | 288 | * The slab lists for all objects. |
1da177e4 LT |
289 | */ |
290 | struct kmem_list3 { | |
b28a02de PE |
291 | struct list_head slabs_partial; /* partial list first, better asm code */ |
292 | struct list_head slabs_full; | |
293 | struct list_head slabs_free; | |
294 | unsigned long free_objects; | |
b28a02de | 295 | unsigned int free_limit; |
2e1217cf | 296 | unsigned int colour_next; /* Per-node cache coloring */ |
b28a02de PE |
297 | spinlock_t list_lock; |
298 | struct array_cache *shared; /* shared per node */ | |
299 | struct array_cache **alien; /* on other nodes */ | |
35386e3b CL |
300 | unsigned long next_reap; /* updated without locking */ |
301 | int free_touched; /* updated without locking */ | |
1da177e4 LT |
302 | }; |
303 | ||
e498be7d CL |
304 | /* |
305 | * Need this for bootstrapping a per node allocator. | |
306 | */ | |
556a169d | 307 | #define NUM_INIT_LISTS (3 * MAX_NUMNODES) |
68a1b195 | 308 | static struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS]; |
e498be7d | 309 | #define CACHE_CACHE 0 |
556a169d PE |
310 | #define SIZE_AC MAX_NUMNODES |
311 | #define SIZE_L3 (2 * MAX_NUMNODES) | |
e498be7d | 312 | |
ed11d9eb CL |
313 | static int drain_freelist(struct kmem_cache *cache, |
314 | struct kmem_list3 *l3, int tofree); | |
315 | static void free_block(struct kmem_cache *cachep, void **objpp, int len, | |
316 | int node); | |
83b519e8 | 317 | static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp); |
65f27f38 | 318 | static void cache_reap(struct work_struct *unused); |
ed11d9eb | 319 | |
e498be7d | 320 | /* |
a737b3e2 AM |
321 | * This function must be completely optimized away if a constant is passed to |
322 | * it. Mostly the same as what is in linux/slab.h except it returns an index. | |
e498be7d | 323 | */ |
7243cc05 | 324 | static __always_inline int index_of(const size_t size) |
e498be7d | 325 | { |
5ec8a847 SR |
326 | extern void __bad_size(void); |
327 | ||
e498be7d CL |
328 | if (__builtin_constant_p(size)) { |
329 | int i = 0; | |
330 | ||
331 | #define CACHE(x) \ | |
332 | if (size <=x) \ | |
333 | return i; \ | |
334 | else \ | |
335 | i++; | |
1c61fc40 | 336 | #include <linux/kmalloc_sizes.h> |
e498be7d | 337 | #undef CACHE |
5ec8a847 | 338 | __bad_size(); |
7243cc05 | 339 | } else |
5ec8a847 | 340 | __bad_size(); |
e498be7d CL |
341 | return 0; |
342 | } | |
343 | ||
e0a42726 IM |
344 | static int slab_early_init = 1; |
345 | ||
e498be7d CL |
346 | #define INDEX_AC index_of(sizeof(struct arraycache_init)) |
347 | #define INDEX_L3 index_of(sizeof(struct kmem_list3)) | |
1da177e4 | 348 | |
5295a74c | 349 | static void kmem_list3_init(struct kmem_list3 *parent) |
e498be7d CL |
350 | { |
351 | INIT_LIST_HEAD(&parent->slabs_full); | |
352 | INIT_LIST_HEAD(&parent->slabs_partial); | |
353 | INIT_LIST_HEAD(&parent->slabs_free); | |
354 | parent->shared = NULL; | |
355 | parent->alien = NULL; | |
2e1217cf | 356 | parent->colour_next = 0; |
e498be7d CL |
357 | spin_lock_init(&parent->list_lock); |
358 | parent->free_objects = 0; | |
359 | parent->free_touched = 0; | |
360 | } | |
361 | ||
a737b3e2 AM |
362 | #define MAKE_LIST(cachep, listp, slab, nodeid) \ |
363 | do { \ | |
364 | INIT_LIST_HEAD(listp); \ | |
365 | list_splice(&(cachep->nodelists[nodeid]->slab), listp); \ | |
e498be7d CL |
366 | } while (0) |
367 | ||
a737b3e2 AM |
368 | #define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ |
369 | do { \ | |
e498be7d CL |
370 | MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid); \ |
371 | MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \ | |
372 | MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \ | |
373 | } while (0) | |
1da177e4 | 374 | |
1da177e4 LT |
375 | #define CFLGS_OFF_SLAB (0x80000000UL) |
376 | #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) | |
377 | ||
378 | #define BATCHREFILL_LIMIT 16 | |
a737b3e2 AM |
379 | /* |
380 | * Optimization question: fewer reaps means less probability for unnessary | |
381 | * cpucache drain/refill cycles. | |
1da177e4 | 382 | * |
dc6f3f27 | 383 | * OTOH the cpuarrays can contain lots of objects, |
1da177e4 LT |
384 | * which could lock up otherwise freeable slabs. |
385 | */ | |
386 | #define REAPTIMEOUT_CPUC (2*HZ) | |
387 | #define REAPTIMEOUT_LIST3 (4*HZ) | |
388 | ||
389 | #if STATS | |
390 | #define STATS_INC_ACTIVE(x) ((x)->num_active++) | |
391 | #define STATS_DEC_ACTIVE(x) ((x)->num_active--) | |
392 | #define STATS_INC_ALLOCED(x) ((x)->num_allocations++) | |
393 | #define STATS_INC_GROWN(x) ((x)->grown++) | |
ed11d9eb | 394 | #define STATS_ADD_REAPED(x,y) ((x)->reaped += (y)) |
a737b3e2 AM |
395 | #define STATS_SET_HIGH(x) \ |
396 | do { \ | |
397 | if ((x)->num_active > (x)->high_mark) \ | |
398 | (x)->high_mark = (x)->num_active; \ | |
399 | } while (0) | |
1da177e4 LT |
400 | #define STATS_INC_ERR(x) ((x)->errors++) |
401 | #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++) | |
e498be7d | 402 | #define STATS_INC_NODEFREES(x) ((x)->node_frees++) |
fb7faf33 | 403 | #define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++) |
a737b3e2 AM |
404 | #define STATS_SET_FREEABLE(x, i) \ |
405 | do { \ | |
406 | if ((x)->max_freeable < i) \ | |
407 | (x)->max_freeable = i; \ | |
408 | } while (0) | |
1da177e4 LT |
409 | #define STATS_INC_ALLOCHIT(x) atomic_inc(&(x)->allochit) |
410 | #define STATS_INC_ALLOCMISS(x) atomic_inc(&(x)->allocmiss) | |
411 | #define STATS_INC_FREEHIT(x) atomic_inc(&(x)->freehit) | |
412 | #define STATS_INC_FREEMISS(x) atomic_inc(&(x)->freemiss) | |
413 | #else | |
414 | #define STATS_INC_ACTIVE(x) do { } while (0) | |
415 | #define STATS_DEC_ACTIVE(x) do { } while (0) | |
416 | #define STATS_INC_ALLOCED(x) do { } while (0) | |
417 | #define STATS_INC_GROWN(x) do { } while (0) | |
4e60c86b | 418 | #define STATS_ADD_REAPED(x,y) do { (void)(y); } while (0) |
1da177e4 LT |
419 | #define STATS_SET_HIGH(x) do { } while (0) |
420 | #define STATS_INC_ERR(x) do { } while (0) | |
421 | #define STATS_INC_NODEALLOCS(x) do { } while (0) | |
e498be7d | 422 | #define STATS_INC_NODEFREES(x) do { } while (0) |
fb7faf33 | 423 | #define STATS_INC_ACOVERFLOW(x) do { } while (0) |
a737b3e2 | 424 | #define STATS_SET_FREEABLE(x, i) do { } while (0) |
1da177e4 LT |
425 | #define STATS_INC_ALLOCHIT(x) do { } while (0) |
426 | #define STATS_INC_ALLOCMISS(x) do { } while (0) | |
427 | #define STATS_INC_FREEHIT(x) do { } while (0) | |
428 | #define STATS_INC_FREEMISS(x) do { } while (0) | |
429 | #endif | |
430 | ||
431 | #if DEBUG | |
1da177e4 | 432 | |
a737b3e2 AM |
433 | /* |
434 | * memory layout of objects: | |
1da177e4 | 435 | * 0 : objp |
3dafccf2 | 436 | * 0 .. cachep->obj_offset - BYTES_PER_WORD - 1: padding. This ensures that |
1da177e4 LT |
437 | * the end of an object is aligned with the end of the real |
438 | * allocation. Catches writes behind the end of the allocation. | |
3dafccf2 | 439 | * cachep->obj_offset - BYTES_PER_WORD .. cachep->obj_offset - 1: |
1da177e4 | 440 | * redzone word. |
3dafccf2 | 441 | * cachep->obj_offset: The real object. |
3b0efdfa CL |
442 | * cachep->size - 2* BYTES_PER_WORD: redzone word [BYTES_PER_WORD long] |
443 | * cachep->size - 1* BYTES_PER_WORD: last caller address | |
a737b3e2 | 444 | * [BYTES_PER_WORD long] |
1da177e4 | 445 | */ |
343e0d7a | 446 | static int obj_offset(struct kmem_cache *cachep) |
1da177e4 | 447 | { |
3dafccf2 | 448 | return cachep->obj_offset; |
1da177e4 LT |
449 | } |
450 | ||
b46b8f19 | 451 | static unsigned long long *dbg_redzone1(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
452 | { |
453 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
b46b8f19 DW |
454 | return (unsigned long long*) (objp + obj_offset(cachep) - |
455 | sizeof(unsigned long long)); | |
1da177e4 LT |
456 | } |
457 | ||
b46b8f19 | 458 | static unsigned long long *dbg_redzone2(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
459 | { |
460 | BUG_ON(!(cachep->flags & SLAB_RED_ZONE)); | |
461 | if (cachep->flags & SLAB_STORE_USER) | |
3b0efdfa | 462 | return (unsigned long long *)(objp + cachep->size - |
b46b8f19 | 463 | sizeof(unsigned long long) - |
87a927c7 | 464 | REDZONE_ALIGN); |
3b0efdfa | 465 | return (unsigned long long *) (objp + cachep->size - |
b46b8f19 | 466 | sizeof(unsigned long long)); |
1da177e4 LT |
467 | } |
468 | ||
343e0d7a | 469 | static void **dbg_userword(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
470 | { |
471 | BUG_ON(!(cachep->flags & SLAB_STORE_USER)); | |
3b0efdfa | 472 | return (void **)(objp + cachep->size - BYTES_PER_WORD); |
1da177e4 LT |
473 | } |
474 | ||
475 | #else | |
476 | ||
3dafccf2 | 477 | #define obj_offset(x) 0 |
b46b8f19 DW |
478 | #define dbg_redzone1(cachep, objp) ({BUG(); (unsigned long long *)NULL;}) |
479 | #define dbg_redzone2(cachep, objp) ({BUG(); (unsigned long long *)NULL;}) | |
1da177e4 LT |
480 | #define dbg_userword(cachep, objp) ({BUG(); (void **)NULL;}) |
481 | ||
482 | #endif | |
483 | ||
1da177e4 | 484 | /* |
3df1cccd DR |
485 | * Do not go above this order unless 0 objects fit into the slab or |
486 | * overridden on the command line. | |
1da177e4 | 487 | */ |
543585cc DR |
488 | #define SLAB_MAX_ORDER_HI 1 |
489 | #define SLAB_MAX_ORDER_LO 0 | |
490 | static int slab_max_order = SLAB_MAX_ORDER_LO; | |
3df1cccd | 491 | static bool slab_max_order_set __initdata; |
1da177e4 | 492 | |
6ed5eb22 PE |
493 | static inline struct kmem_cache *virt_to_cache(const void *obj) |
494 | { | |
b49af68f | 495 | struct page *page = virt_to_head_page(obj); |
35026088 | 496 | return page->slab_cache; |
6ed5eb22 PE |
497 | } |
498 | ||
499 | static inline struct slab *virt_to_slab(const void *obj) | |
500 | { | |
b49af68f | 501 | struct page *page = virt_to_head_page(obj); |
35026088 CL |
502 | |
503 | VM_BUG_ON(!PageSlab(page)); | |
504 | return page->slab_page; | |
6ed5eb22 PE |
505 | } |
506 | ||
8fea4e96 PE |
507 | static inline void *index_to_obj(struct kmem_cache *cache, struct slab *slab, |
508 | unsigned int idx) | |
509 | { | |
3b0efdfa | 510 | return slab->s_mem + cache->size * idx; |
8fea4e96 PE |
511 | } |
512 | ||
6a2d7a95 | 513 | /* |
3b0efdfa CL |
514 | * We want to avoid an expensive divide : (offset / cache->size) |
515 | * Using the fact that size is a constant for a particular cache, | |
516 | * we can replace (offset / cache->size) by | |
6a2d7a95 ED |
517 | * reciprocal_divide(offset, cache->reciprocal_buffer_size) |
518 | */ | |
519 | static inline unsigned int obj_to_index(const struct kmem_cache *cache, | |
520 | const struct slab *slab, void *obj) | |
8fea4e96 | 521 | { |
6a2d7a95 ED |
522 | u32 offset = (obj - slab->s_mem); |
523 | return reciprocal_divide(offset, cache->reciprocal_buffer_size); | |
8fea4e96 PE |
524 | } |
525 | ||
a737b3e2 AM |
526 | /* |
527 | * These are the default caches for kmalloc. Custom caches can have other sizes. | |
528 | */ | |
1da177e4 LT |
529 | struct cache_sizes malloc_sizes[] = { |
530 | #define CACHE(x) { .cs_size = (x) }, | |
531 | #include <linux/kmalloc_sizes.h> | |
532 | CACHE(ULONG_MAX) | |
533 | #undef CACHE | |
534 | }; | |
535 | EXPORT_SYMBOL(malloc_sizes); | |
536 | ||
537 | /* Must match cache_sizes above. Out of line to keep cache footprint low. */ | |
538 | struct cache_names { | |
539 | char *name; | |
540 | char *name_dma; | |
541 | }; | |
542 | ||
543 | static struct cache_names __initdata cache_names[] = { | |
544 | #define CACHE(x) { .name = "size-" #x, .name_dma = "size-" #x "(DMA)" }, | |
545 | #include <linux/kmalloc_sizes.h> | |
b28a02de | 546 | {NULL,} |
1da177e4 LT |
547 | #undef CACHE |
548 | }; | |
549 | ||
550 | static struct arraycache_init initarray_cache __initdata = | |
b28a02de | 551 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 | 552 | static struct arraycache_init initarray_generic = |
b28a02de | 553 | { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; |
1da177e4 LT |
554 | |
555 | /* internal cache of cache description objs */ | |
9b030cb8 | 556 | static struct kmem_cache kmem_cache_boot = { |
b28a02de PE |
557 | .batchcount = 1, |
558 | .limit = BOOT_CPUCACHE_ENTRIES, | |
559 | .shared = 1, | |
3b0efdfa | 560 | .size = sizeof(struct kmem_cache), |
b28a02de | 561 | .name = "kmem_cache", |
1da177e4 LT |
562 | }; |
563 | ||
056c6241 RT |
564 | #define BAD_ALIEN_MAGIC 0x01020304ul |
565 | ||
f1aaee53 AV |
566 | #ifdef CONFIG_LOCKDEP |
567 | ||
568 | /* | |
569 | * Slab sometimes uses the kmalloc slabs to store the slab headers | |
570 | * for other slabs "off slab". | |
571 | * The locking for this is tricky in that it nests within the locks | |
572 | * of all other slabs in a few places; to deal with this special | |
573 | * locking we put on-slab caches into a separate lock-class. | |
056c6241 RT |
574 | * |
575 | * We set lock class for alien array caches which are up during init. | |
576 | * The lock annotation will be lost if all cpus of a node goes down and | |
577 | * then comes back up during hotplug | |
f1aaee53 | 578 | */ |
056c6241 RT |
579 | static struct lock_class_key on_slab_l3_key; |
580 | static struct lock_class_key on_slab_alc_key; | |
581 | ||
83835b3d PZ |
582 | static struct lock_class_key debugobj_l3_key; |
583 | static struct lock_class_key debugobj_alc_key; | |
584 | ||
585 | static void slab_set_lock_classes(struct kmem_cache *cachep, | |
586 | struct lock_class_key *l3_key, struct lock_class_key *alc_key, | |
587 | int q) | |
588 | { | |
589 | struct array_cache **alc; | |
590 | struct kmem_list3 *l3; | |
591 | int r; | |
592 | ||
593 | l3 = cachep->nodelists[q]; | |
594 | if (!l3) | |
595 | return; | |
596 | ||
597 | lockdep_set_class(&l3->list_lock, l3_key); | |
598 | alc = l3->alien; | |
599 | /* | |
600 | * FIXME: This check for BAD_ALIEN_MAGIC | |
601 | * should go away when common slab code is taught to | |
602 | * work even without alien caches. | |
603 | * Currently, non NUMA code returns BAD_ALIEN_MAGIC | |
604 | * for alloc_alien_cache, | |
605 | */ | |
606 | if (!alc || (unsigned long)alc == BAD_ALIEN_MAGIC) | |
607 | return; | |
608 | for_each_node(r) { | |
609 | if (alc[r]) | |
610 | lockdep_set_class(&alc[r]->lock, alc_key); | |
611 | } | |
612 | } | |
613 | ||
614 | static void slab_set_debugobj_lock_classes_node(struct kmem_cache *cachep, int node) | |
615 | { | |
616 | slab_set_lock_classes(cachep, &debugobj_l3_key, &debugobj_alc_key, node); | |
617 | } | |
618 | ||
619 | static void slab_set_debugobj_lock_classes(struct kmem_cache *cachep) | |
620 | { | |
621 | int node; | |
622 | ||
623 | for_each_online_node(node) | |
624 | slab_set_debugobj_lock_classes_node(cachep, node); | |
625 | } | |
626 | ||
ce79ddc8 | 627 | static void init_node_lock_keys(int q) |
f1aaee53 | 628 | { |
056c6241 RT |
629 | struct cache_sizes *s = malloc_sizes; |
630 | ||
97d06609 | 631 | if (slab_state < UP) |
ce79ddc8 PE |
632 | return; |
633 | ||
634 | for (s = malloc_sizes; s->cs_size != ULONG_MAX; s++) { | |
ce79ddc8 | 635 | struct kmem_list3 *l3; |
ce79ddc8 PE |
636 | |
637 | l3 = s->cs_cachep->nodelists[q]; | |
638 | if (!l3 || OFF_SLAB(s->cs_cachep)) | |
00afa758 | 639 | continue; |
83835b3d PZ |
640 | |
641 | slab_set_lock_classes(s->cs_cachep, &on_slab_l3_key, | |
642 | &on_slab_alc_key, q); | |
f1aaee53 AV |
643 | } |
644 | } | |
ce79ddc8 PE |
645 | |
646 | static inline void init_lock_keys(void) | |
647 | { | |
648 | int node; | |
649 | ||
650 | for_each_node(node) | |
651 | init_node_lock_keys(node); | |
652 | } | |
f1aaee53 | 653 | #else |
ce79ddc8 PE |
654 | static void init_node_lock_keys(int q) |
655 | { | |
656 | } | |
657 | ||
056c6241 | 658 | static inline void init_lock_keys(void) |
f1aaee53 AV |
659 | { |
660 | } | |
83835b3d PZ |
661 | |
662 | static void slab_set_debugobj_lock_classes_node(struct kmem_cache *cachep, int node) | |
663 | { | |
664 | } | |
665 | ||
666 | static void slab_set_debugobj_lock_classes(struct kmem_cache *cachep) | |
667 | { | |
668 | } | |
f1aaee53 AV |
669 | #endif |
670 | ||
1871e52c | 671 | static DEFINE_PER_CPU(struct delayed_work, slab_reap_work); |
1da177e4 | 672 | |
343e0d7a | 673 | static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) |
1da177e4 LT |
674 | { |
675 | return cachep->array[smp_processor_id()]; | |
676 | } | |
677 | ||
a737b3e2 AM |
678 | static inline struct kmem_cache *__find_general_cachep(size_t size, |
679 | gfp_t gfpflags) | |
1da177e4 LT |
680 | { |
681 | struct cache_sizes *csizep = malloc_sizes; | |
682 | ||
683 | #if DEBUG | |
684 | /* This happens if someone tries to call | |
b28a02de PE |
685 | * kmem_cache_create(), or __kmalloc(), before |
686 | * the generic caches are initialized. | |
687 | */ | |
c7e43c78 | 688 | BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL); |
1da177e4 | 689 | #endif |
6cb8f913 CL |
690 | if (!size) |
691 | return ZERO_SIZE_PTR; | |
692 | ||
1da177e4 LT |
693 | while (size > csizep->cs_size) |
694 | csizep++; | |
695 | ||
696 | /* | |
0abf40c1 | 697 | * Really subtle: The last entry with cs->cs_size==ULONG_MAX |
1da177e4 LT |
698 | * has cs_{dma,}cachep==NULL. Thus no special case |
699 | * for large kmalloc calls required. | |
700 | */ | |
4b51d669 | 701 | #ifdef CONFIG_ZONE_DMA |
1da177e4 LT |
702 | if (unlikely(gfpflags & GFP_DMA)) |
703 | return csizep->cs_dmacachep; | |
4b51d669 | 704 | #endif |
1da177e4 LT |
705 | return csizep->cs_cachep; |
706 | } | |
707 | ||
b221385b | 708 | static struct kmem_cache *kmem_find_general_cachep(size_t size, gfp_t gfpflags) |
97e2bde4 MS |
709 | { |
710 | return __find_general_cachep(size, gfpflags); | |
711 | } | |
97e2bde4 | 712 | |
fbaccacf | 713 | static size_t slab_mgmt_size(size_t nr_objs, size_t align) |
1da177e4 | 714 | { |
fbaccacf SR |
715 | return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align); |
716 | } | |
1da177e4 | 717 | |
a737b3e2 AM |
718 | /* |
719 | * Calculate the number of objects and left-over bytes for a given buffer size. | |
720 | */ | |
fbaccacf SR |
721 | static void cache_estimate(unsigned long gfporder, size_t buffer_size, |
722 | size_t align, int flags, size_t *left_over, | |
723 | unsigned int *num) | |
724 | { | |
725 | int nr_objs; | |
726 | size_t mgmt_size; | |
727 | size_t slab_size = PAGE_SIZE << gfporder; | |
1da177e4 | 728 | |
fbaccacf SR |
729 | /* |
730 | * The slab management structure can be either off the slab or | |
731 | * on it. For the latter case, the memory allocated for a | |
732 | * slab is used for: | |
733 | * | |
734 | * - The struct slab | |
735 | * - One kmem_bufctl_t for each object | |
736 | * - Padding to respect alignment of @align | |
737 | * - @buffer_size bytes for each object | |
738 | * | |
739 | * If the slab management structure is off the slab, then the | |
740 | * alignment will already be calculated into the size. Because | |
741 | * the slabs are all pages aligned, the objects will be at the | |
742 | * correct alignment when allocated. | |
743 | */ | |
744 | if (flags & CFLGS_OFF_SLAB) { | |
745 | mgmt_size = 0; | |
746 | nr_objs = slab_size / buffer_size; | |
747 | ||
748 | if (nr_objs > SLAB_LIMIT) | |
749 | nr_objs = SLAB_LIMIT; | |
750 | } else { | |
751 | /* | |
752 | * Ignore padding for the initial guess. The padding | |
753 | * is at most @align-1 bytes, and @buffer_size is at | |
754 | * least @align. In the worst case, this result will | |
755 | * be one greater than the number of objects that fit | |
756 | * into the memory allocation when taking the padding | |
757 | * into account. | |
758 | */ | |
759 | nr_objs = (slab_size - sizeof(struct slab)) / | |
760 | (buffer_size + sizeof(kmem_bufctl_t)); | |
761 | ||
762 | /* | |
763 | * This calculated number will be either the right | |
764 | * amount, or one greater than what we want. | |
765 | */ | |
766 | if (slab_mgmt_size(nr_objs, align) + nr_objs*buffer_size | |
767 | > slab_size) | |
768 | nr_objs--; | |
769 | ||
770 | if (nr_objs > SLAB_LIMIT) | |
771 | nr_objs = SLAB_LIMIT; | |
772 | ||
773 | mgmt_size = slab_mgmt_size(nr_objs, align); | |
774 | } | |
775 | *num = nr_objs; | |
776 | *left_over = slab_size - nr_objs*buffer_size - mgmt_size; | |
1da177e4 LT |
777 | } |
778 | ||
f28510d3 | 779 | #if DEBUG |
d40cee24 | 780 | #define slab_error(cachep, msg) __slab_error(__func__, cachep, msg) |
1da177e4 | 781 | |
a737b3e2 AM |
782 | static void __slab_error(const char *function, struct kmem_cache *cachep, |
783 | char *msg) | |
1da177e4 LT |
784 | { |
785 | printk(KERN_ERR "slab error in %s(): cache `%s': %s\n", | |
b28a02de | 786 | function, cachep->name, msg); |
1da177e4 | 787 | dump_stack(); |
645df230 | 788 | add_taint(TAINT_BAD_PAGE); |
1da177e4 | 789 | } |
f28510d3 | 790 | #endif |
1da177e4 | 791 | |
3395ee05 PM |
792 | /* |
793 | * By default on NUMA we use alien caches to stage the freeing of | |
794 | * objects allocated from other nodes. This causes massive memory | |
795 | * inefficiencies when using fake NUMA setup to split memory into a | |
796 | * large number of small nodes, so it can be disabled on the command | |
797 | * line | |
798 | */ | |
799 | ||
800 | static int use_alien_caches __read_mostly = 1; | |
801 | static int __init noaliencache_setup(char *s) | |
802 | { | |
803 | use_alien_caches = 0; | |
804 | return 1; | |
805 | } | |
806 | __setup("noaliencache", noaliencache_setup); | |
807 | ||
3df1cccd DR |
808 | static int __init slab_max_order_setup(char *str) |
809 | { | |
810 | get_option(&str, &slab_max_order); | |
811 | slab_max_order = slab_max_order < 0 ? 0 : | |
812 | min(slab_max_order, MAX_ORDER - 1); | |
813 | slab_max_order_set = true; | |
814 | ||
815 | return 1; | |
816 | } | |
817 | __setup("slab_max_order=", slab_max_order_setup); | |
818 | ||
8fce4d8e CL |
819 | #ifdef CONFIG_NUMA |
820 | /* | |
821 | * Special reaping functions for NUMA systems called from cache_reap(). | |
822 | * These take care of doing round robin flushing of alien caches (containing | |
823 | * objects freed on different nodes from which they were allocated) and the | |
824 | * flushing of remote pcps by calling drain_node_pages. | |
825 | */ | |
1871e52c | 826 | static DEFINE_PER_CPU(unsigned long, slab_reap_node); |
8fce4d8e CL |
827 | |
828 | static void init_reap_node(int cpu) | |
829 | { | |
830 | int node; | |
831 | ||
7d6e6d09 | 832 | node = next_node(cpu_to_mem(cpu), node_online_map); |
8fce4d8e | 833 | if (node == MAX_NUMNODES) |
442295c9 | 834 | node = first_node(node_online_map); |
8fce4d8e | 835 | |
1871e52c | 836 | per_cpu(slab_reap_node, cpu) = node; |
8fce4d8e CL |
837 | } |
838 | ||
839 | static void next_reap_node(void) | |
840 | { | |
909ea964 | 841 | int node = __this_cpu_read(slab_reap_node); |
8fce4d8e | 842 | |
8fce4d8e CL |
843 | node = next_node(node, node_online_map); |
844 | if (unlikely(node >= MAX_NUMNODES)) | |
845 | node = first_node(node_online_map); | |
909ea964 | 846 | __this_cpu_write(slab_reap_node, node); |
8fce4d8e CL |
847 | } |
848 | ||
849 | #else | |
850 | #define init_reap_node(cpu) do { } while (0) | |
851 | #define next_reap_node(void) do { } while (0) | |
852 | #endif | |
853 | ||
1da177e4 LT |
854 | /* |
855 | * Initiate the reap timer running on the target CPU. We run at around 1 to 2Hz | |
856 | * via the workqueue/eventd. | |
857 | * Add the CPU number into the expiration time to minimize the possibility of | |
858 | * the CPUs getting into lockstep and contending for the global cache chain | |
859 | * lock. | |
860 | */ | |
897e679b | 861 | static void __cpuinit start_cpu_timer(int cpu) |
1da177e4 | 862 | { |
1871e52c | 863 | struct delayed_work *reap_work = &per_cpu(slab_reap_work, cpu); |
1da177e4 LT |
864 | |
865 | /* | |
866 | * When this gets called from do_initcalls via cpucache_init(), | |
867 | * init_workqueues() has already run, so keventd will be setup | |
868 | * at that time. | |
869 | */ | |
52bad64d | 870 | if (keventd_up() && reap_work->work.func == NULL) { |
8fce4d8e | 871 | init_reap_node(cpu); |
203b42f7 | 872 | INIT_DEFERRABLE_WORK(reap_work, cache_reap); |
2b284214 AV |
873 | schedule_delayed_work_on(cpu, reap_work, |
874 | __round_jiffies_relative(HZ, cpu)); | |
1da177e4 LT |
875 | } |
876 | } | |
877 | ||
e498be7d | 878 | static struct array_cache *alloc_arraycache(int node, int entries, |
83b519e8 | 879 | int batchcount, gfp_t gfp) |
1da177e4 | 880 | { |
b28a02de | 881 | int memsize = sizeof(void *) * entries + sizeof(struct array_cache); |
1da177e4 LT |
882 | struct array_cache *nc = NULL; |
883 | ||
83b519e8 | 884 | nc = kmalloc_node(memsize, gfp, node); |
d5cff635 CM |
885 | /* |
886 | * The array_cache structures contain pointers to free object. | |
25985edc | 887 | * However, when such objects are allocated or transferred to another |
d5cff635 CM |
888 | * cache the pointers are not cleared and they could be counted as |
889 | * valid references during a kmemleak scan. Therefore, kmemleak must | |
890 | * not scan such objects. | |
891 | */ | |
892 | kmemleak_no_scan(nc); | |
1da177e4 LT |
893 | if (nc) { |
894 | nc->avail = 0; | |
895 | nc->limit = entries; | |
896 | nc->batchcount = batchcount; | |
897 | nc->touched = 0; | |
e498be7d | 898 | spin_lock_init(&nc->lock); |
1da177e4 LT |
899 | } |
900 | return nc; | |
901 | } | |
902 | ||
072bb0aa MG |
903 | static inline bool is_slab_pfmemalloc(struct slab *slabp) |
904 | { | |
905 | struct page *page = virt_to_page(slabp->s_mem); | |
906 | ||
907 | return PageSlabPfmemalloc(page); | |
908 | } | |
909 | ||
910 | /* Clears pfmemalloc_active if no slabs have pfmalloc set */ | |
911 | static void recheck_pfmemalloc_active(struct kmem_cache *cachep, | |
912 | struct array_cache *ac) | |
913 | { | |
914 | struct kmem_list3 *l3 = cachep->nodelists[numa_mem_id()]; | |
915 | struct slab *slabp; | |
916 | unsigned long flags; | |
917 | ||
918 | if (!pfmemalloc_active) | |
919 | return; | |
920 | ||
921 | spin_lock_irqsave(&l3->list_lock, flags); | |
922 | list_for_each_entry(slabp, &l3->slabs_full, list) | |
923 | if (is_slab_pfmemalloc(slabp)) | |
924 | goto out; | |
925 | ||
926 | list_for_each_entry(slabp, &l3->slabs_partial, list) | |
927 | if (is_slab_pfmemalloc(slabp)) | |
928 | goto out; | |
929 | ||
930 | list_for_each_entry(slabp, &l3->slabs_free, list) | |
931 | if (is_slab_pfmemalloc(slabp)) | |
932 | goto out; | |
933 | ||
934 | pfmemalloc_active = false; | |
935 | out: | |
936 | spin_unlock_irqrestore(&l3->list_lock, flags); | |
937 | } | |
938 | ||
381760ea | 939 | static void *__ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac, |
072bb0aa MG |
940 | gfp_t flags, bool force_refill) |
941 | { | |
942 | int i; | |
943 | void *objp = ac->entry[--ac->avail]; | |
944 | ||
945 | /* Ensure the caller is allowed to use objects from PFMEMALLOC slab */ | |
946 | if (unlikely(is_obj_pfmemalloc(objp))) { | |
947 | struct kmem_list3 *l3; | |
948 | ||
949 | if (gfp_pfmemalloc_allowed(flags)) { | |
950 | clear_obj_pfmemalloc(&objp); | |
951 | return objp; | |
952 | } | |
953 | ||
954 | /* The caller cannot use PFMEMALLOC objects, find another one */ | |
d014dc2e | 955 | for (i = 0; i < ac->avail; i++) { |
072bb0aa MG |
956 | /* If a !PFMEMALLOC object is found, swap them */ |
957 | if (!is_obj_pfmemalloc(ac->entry[i])) { | |
958 | objp = ac->entry[i]; | |
959 | ac->entry[i] = ac->entry[ac->avail]; | |
960 | ac->entry[ac->avail] = objp; | |
961 | return objp; | |
962 | } | |
963 | } | |
964 | ||
965 | /* | |
966 | * If there are empty slabs on the slabs_free list and we are | |
967 | * being forced to refill the cache, mark this one !pfmemalloc. | |
968 | */ | |
969 | l3 = cachep->nodelists[numa_mem_id()]; | |
970 | if (!list_empty(&l3->slabs_free) && force_refill) { | |
971 | struct slab *slabp = virt_to_slab(objp); | |
30c29bea | 972 | ClearPageSlabPfmemalloc(virt_to_head_page(slabp->s_mem)); |
072bb0aa MG |
973 | clear_obj_pfmemalloc(&objp); |
974 | recheck_pfmemalloc_active(cachep, ac); | |
975 | return objp; | |
976 | } | |
977 | ||
978 | /* No !PFMEMALLOC objects available */ | |
979 | ac->avail++; | |
980 | objp = NULL; | |
981 | } | |
982 | ||
983 | return objp; | |
984 | } | |
985 | ||
381760ea MG |
986 | static inline void *ac_get_obj(struct kmem_cache *cachep, |
987 | struct array_cache *ac, gfp_t flags, bool force_refill) | |
988 | { | |
989 | void *objp; | |
990 | ||
991 | if (unlikely(sk_memalloc_socks())) | |
992 | objp = __ac_get_obj(cachep, ac, flags, force_refill); | |
993 | else | |
994 | objp = ac->entry[--ac->avail]; | |
995 | ||
996 | return objp; | |
997 | } | |
998 | ||
999 | static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac, | |
072bb0aa MG |
1000 | void *objp) |
1001 | { | |
1002 | if (unlikely(pfmemalloc_active)) { | |
1003 | /* Some pfmemalloc slabs exist, check if this is one */ | |
30c29bea | 1004 | struct page *page = virt_to_head_page(objp); |
072bb0aa MG |
1005 | if (PageSlabPfmemalloc(page)) |
1006 | set_obj_pfmemalloc(&objp); | |
1007 | } | |
1008 | ||
381760ea MG |
1009 | return objp; |
1010 | } | |
1011 | ||
1012 | static inline void ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac, | |
1013 | void *objp) | |
1014 | { | |
1015 | if (unlikely(sk_memalloc_socks())) | |
1016 | objp = __ac_put_obj(cachep, ac, objp); | |
1017 | ||
072bb0aa MG |
1018 | ac->entry[ac->avail++] = objp; |
1019 | } | |
1020 | ||
3ded175a CL |
1021 | /* |
1022 | * Transfer objects in one arraycache to another. | |
1023 | * Locking must be handled by the caller. | |
1024 | * | |
1025 | * Return the number of entries transferred. | |
1026 | */ | |
1027 | static int transfer_objects(struct array_cache *to, | |
1028 | struct array_cache *from, unsigned int max) | |
1029 | { | |
1030 | /* Figure out how many entries to transfer */ | |
732eacc0 | 1031 | int nr = min3(from->avail, max, to->limit - to->avail); |
3ded175a CL |
1032 | |
1033 | if (!nr) | |
1034 | return 0; | |
1035 | ||
1036 | memcpy(to->entry + to->avail, from->entry + from->avail -nr, | |
1037 | sizeof(void *) *nr); | |
1038 | ||
1039 | from->avail -= nr; | |
1040 | to->avail += nr; | |
3ded175a CL |
1041 | return nr; |
1042 | } | |
1043 | ||
765c4507 CL |
1044 | #ifndef CONFIG_NUMA |
1045 | ||
1046 | #define drain_alien_cache(cachep, alien) do { } while (0) | |
1047 | #define reap_alien(cachep, l3) do { } while (0) | |
1048 | ||
83b519e8 | 1049 | static inline struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) |
765c4507 CL |
1050 | { |
1051 | return (struct array_cache **)BAD_ALIEN_MAGIC; | |
1052 | } | |
1053 | ||
1054 | static inline void free_alien_cache(struct array_cache **ac_ptr) | |
1055 | { | |
1056 | } | |
1057 | ||
1058 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) | |
1059 | { | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | static inline void *alternate_node_alloc(struct kmem_cache *cachep, | |
1064 | gfp_t flags) | |
1065 | { | |
1066 | return NULL; | |
1067 | } | |
1068 | ||
8b98c169 | 1069 | static inline void *____cache_alloc_node(struct kmem_cache *cachep, |
765c4507 CL |
1070 | gfp_t flags, int nodeid) |
1071 | { | |
1072 | return NULL; | |
1073 | } | |
1074 | ||
1075 | #else /* CONFIG_NUMA */ | |
1076 | ||
8b98c169 | 1077 | static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int); |
c61afb18 | 1078 | static void *alternate_node_alloc(struct kmem_cache *, gfp_t); |
dc85da15 | 1079 | |
83b519e8 | 1080 | static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) |
e498be7d CL |
1081 | { |
1082 | struct array_cache **ac_ptr; | |
8ef82866 | 1083 | int memsize = sizeof(void *) * nr_node_ids; |
e498be7d CL |
1084 | int i; |
1085 | ||
1086 | if (limit > 1) | |
1087 | limit = 12; | |
f3186a9c | 1088 | ac_ptr = kzalloc_node(memsize, gfp, node); |
e498be7d CL |
1089 | if (ac_ptr) { |
1090 | for_each_node(i) { | |
f3186a9c | 1091 | if (i == node || !node_online(i)) |
e498be7d | 1092 | continue; |
83b519e8 | 1093 | ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp); |
e498be7d | 1094 | if (!ac_ptr[i]) { |
cc550def | 1095 | for (i--; i >= 0; i--) |
e498be7d CL |
1096 | kfree(ac_ptr[i]); |
1097 | kfree(ac_ptr); | |
1098 | return NULL; | |
1099 | } | |
1100 | } | |
1101 | } | |
1102 | return ac_ptr; | |
1103 | } | |
1104 | ||
5295a74c | 1105 | static void free_alien_cache(struct array_cache **ac_ptr) |
e498be7d CL |
1106 | { |
1107 | int i; | |
1108 | ||
1109 | if (!ac_ptr) | |
1110 | return; | |
e498be7d | 1111 | for_each_node(i) |
b28a02de | 1112 | kfree(ac_ptr[i]); |
e498be7d CL |
1113 | kfree(ac_ptr); |
1114 | } | |
1115 | ||
343e0d7a | 1116 | static void __drain_alien_cache(struct kmem_cache *cachep, |
5295a74c | 1117 | struct array_cache *ac, int node) |
e498be7d CL |
1118 | { |
1119 | struct kmem_list3 *rl3 = cachep->nodelists[node]; | |
1120 | ||
1121 | if (ac->avail) { | |
1122 | spin_lock(&rl3->list_lock); | |
e00946fe CL |
1123 | /* |
1124 | * Stuff objects into the remote nodes shared array first. | |
1125 | * That way we could avoid the overhead of putting the objects | |
1126 | * into the free lists and getting them back later. | |
1127 | */ | |
693f7d36 | 1128 | if (rl3->shared) |
1129 | transfer_objects(rl3->shared, ac, ac->limit); | |
e00946fe | 1130 | |
ff69416e | 1131 | free_block(cachep, ac->entry, ac->avail, node); |
e498be7d CL |
1132 | ac->avail = 0; |
1133 | spin_unlock(&rl3->list_lock); | |
1134 | } | |
1135 | } | |
1136 | ||
8fce4d8e CL |
1137 | /* |
1138 | * Called from cache_reap() to regularly drain alien caches round robin. | |
1139 | */ | |
1140 | static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3) | |
1141 | { | |
909ea964 | 1142 | int node = __this_cpu_read(slab_reap_node); |
8fce4d8e CL |
1143 | |
1144 | if (l3->alien) { | |
1145 | struct array_cache *ac = l3->alien[node]; | |
e00946fe CL |
1146 | |
1147 | if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { | |
8fce4d8e CL |
1148 | __drain_alien_cache(cachep, ac, node); |
1149 | spin_unlock_irq(&ac->lock); | |
1150 | } | |
1151 | } | |
1152 | } | |
1153 | ||
a737b3e2 AM |
1154 | static void drain_alien_cache(struct kmem_cache *cachep, |
1155 | struct array_cache **alien) | |
e498be7d | 1156 | { |
b28a02de | 1157 | int i = 0; |
e498be7d CL |
1158 | struct array_cache *ac; |
1159 | unsigned long flags; | |
1160 | ||
1161 | for_each_online_node(i) { | |
4484ebf1 | 1162 | ac = alien[i]; |
e498be7d CL |
1163 | if (ac) { |
1164 | spin_lock_irqsave(&ac->lock, flags); | |
1165 | __drain_alien_cache(cachep, ac, i); | |
1166 | spin_unlock_irqrestore(&ac->lock, flags); | |
1167 | } | |
1168 | } | |
1169 | } | |
729bd0b7 | 1170 | |
873623df | 1171 | static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) |
729bd0b7 PE |
1172 | { |
1173 | struct slab *slabp = virt_to_slab(objp); | |
1174 | int nodeid = slabp->nodeid; | |
1175 | struct kmem_list3 *l3; | |
1176 | struct array_cache *alien = NULL; | |
1ca4cb24 PE |
1177 | int node; |
1178 | ||
7d6e6d09 | 1179 | node = numa_mem_id(); |
729bd0b7 PE |
1180 | |
1181 | /* | |
1182 | * Make sure we are not freeing a object from another node to the array | |
1183 | * cache on this cpu. | |
1184 | */ | |
62918a03 | 1185 | if (likely(slabp->nodeid == node)) |
729bd0b7 PE |
1186 | return 0; |
1187 | ||
1ca4cb24 | 1188 | l3 = cachep->nodelists[node]; |
729bd0b7 PE |
1189 | STATS_INC_NODEFREES(cachep); |
1190 | if (l3->alien && l3->alien[nodeid]) { | |
1191 | alien = l3->alien[nodeid]; | |
873623df | 1192 | spin_lock(&alien->lock); |
729bd0b7 PE |
1193 | if (unlikely(alien->avail == alien->limit)) { |
1194 | STATS_INC_ACOVERFLOW(cachep); | |
1195 | __drain_alien_cache(cachep, alien, nodeid); | |
1196 | } | |
072bb0aa | 1197 | ac_put_obj(cachep, alien, objp); |
729bd0b7 PE |
1198 | spin_unlock(&alien->lock); |
1199 | } else { | |
1200 | spin_lock(&(cachep->nodelists[nodeid])->list_lock); | |
1201 | free_block(cachep, &objp, 1, nodeid); | |
1202 | spin_unlock(&(cachep->nodelists[nodeid])->list_lock); | |
1203 | } | |
1204 | return 1; | |
1205 | } | |
e498be7d CL |
1206 | #endif |
1207 | ||
8f9f8d9e DR |
1208 | /* |
1209 | * Allocates and initializes nodelists for a node on each slab cache, used for | |
1210 | * either memory or cpu hotplug. If memory is being hot-added, the kmem_list3 | |
1211 | * will be allocated off-node since memory is not yet online for the new node. | |
1212 | * When hotplugging memory or a cpu, existing nodelists are not replaced if | |
1213 | * already in use. | |
1214 | * | |
18004c5d | 1215 | * Must hold slab_mutex. |
8f9f8d9e DR |
1216 | */ |
1217 | static int init_cache_nodelists_node(int node) | |
1218 | { | |
1219 | struct kmem_cache *cachep; | |
1220 | struct kmem_list3 *l3; | |
1221 | const int memsize = sizeof(struct kmem_list3); | |
1222 | ||
18004c5d | 1223 | list_for_each_entry(cachep, &slab_caches, list) { |
8f9f8d9e DR |
1224 | /* |
1225 | * Set up the size64 kmemlist for cpu before we can | |
1226 | * begin anything. Make sure some other cpu on this | |
1227 | * node has not already allocated this | |
1228 | */ | |
1229 | if (!cachep->nodelists[node]) { | |
1230 | l3 = kmalloc_node(memsize, GFP_KERNEL, node); | |
1231 | if (!l3) | |
1232 | return -ENOMEM; | |
1233 | kmem_list3_init(l3); | |
1234 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
1235 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
1236 | ||
1237 | /* | |
1238 | * The l3s don't come and go as CPUs come and | |
18004c5d | 1239 | * go. slab_mutex is sufficient |
8f9f8d9e DR |
1240 | * protection here. |
1241 | */ | |
1242 | cachep->nodelists[node] = l3; | |
1243 | } | |
1244 | ||
1245 | spin_lock_irq(&cachep->nodelists[node]->list_lock); | |
1246 | cachep->nodelists[node]->free_limit = | |
1247 | (1 + nr_cpus_node(node)) * | |
1248 | cachep->batchcount + cachep->num; | |
1249 | spin_unlock_irq(&cachep->nodelists[node]->list_lock); | |
1250 | } | |
1251 | return 0; | |
1252 | } | |
1253 | ||
fbf1e473 AM |
1254 | static void __cpuinit cpuup_canceled(long cpu) |
1255 | { | |
1256 | struct kmem_cache *cachep; | |
1257 | struct kmem_list3 *l3 = NULL; | |
7d6e6d09 | 1258 | int node = cpu_to_mem(cpu); |
a70f7302 | 1259 | const struct cpumask *mask = cpumask_of_node(node); |
fbf1e473 | 1260 | |
18004c5d | 1261 | list_for_each_entry(cachep, &slab_caches, list) { |
fbf1e473 AM |
1262 | struct array_cache *nc; |
1263 | struct array_cache *shared; | |
1264 | struct array_cache **alien; | |
fbf1e473 | 1265 | |
fbf1e473 AM |
1266 | /* cpu is dead; no one can alloc from it. */ |
1267 | nc = cachep->array[cpu]; | |
1268 | cachep->array[cpu] = NULL; | |
1269 | l3 = cachep->nodelists[node]; | |
1270 | ||
1271 | if (!l3) | |
1272 | goto free_array_cache; | |
1273 | ||
1274 | spin_lock_irq(&l3->list_lock); | |
1275 | ||
1276 | /* Free limit for this kmem_list3 */ | |
1277 | l3->free_limit -= cachep->batchcount; | |
1278 | if (nc) | |
1279 | free_block(cachep, nc->entry, nc->avail, node); | |
1280 | ||
58463c1f | 1281 | if (!cpumask_empty(mask)) { |
fbf1e473 AM |
1282 | spin_unlock_irq(&l3->list_lock); |
1283 | goto free_array_cache; | |
1284 | } | |
1285 | ||
1286 | shared = l3->shared; | |
1287 | if (shared) { | |
1288 | free_block(cachep, shared->entry, | |
1289 | shared->avail, node); | |
1290 | l3->shared = NULL; | |
1291 | } | |
1292 | ||
1293 | alien = l3->alien; | |
1294 | l3->alien = NULL; | |
1295 | ||
1296 | spin_unlock_irq(&l3->list_lock); | |
1297 | ||
1298 | kfree(shared); | |
1299 | if (alien) { | |
1300 | drain_alien_cache(cachep, alien); | |
1301 | free_alien_cache(alien); | |
1302 | } | |
1303 | free_array_cache: | |
1304 | kfree(nc); | |
1305 | } | |
1306 | /* | |
1307 | * In the previous loop, all the objects were freed to | |
1308 | * the respective cache's slabs, now we can go ahead and | |
1309 | * shrink each nodelist to its limit. | |
1310 | */ | |
18004c5d | 1311 | list_for_each_entry(cachep, &slab_caches, list) { |
fbf1e473 AM |
1312 | l3 = cachep->nodelists[node]; |
1313 | if (!l3) | |
1314 | continue; | |
1315 | drain_freelist(cachep, l3, l3->free_objects); | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | static int __cpuinit cpuup_prepare(long cpu) | |
1da177e4 | 1320 | { |
343e0d7a | 1321 | struct kmem_cache *cachep; |
e498be7d | 1322 | struct kmem_list3 *l3 = NULL; |
7d6e6d09 | 1323 | int node = cpu_to_mem(cpu); |
8f9f8d9e | 1324 | int err; |
1da177e4 | 1325 | |
fbf1e473 AM |
1326 | /* |
1327 | * We need to do this right in the beginning since | |
1328 | * alloc_arraycache's are going to use this list. | |
1329 | * kmalloc_node allows us to add the slab to the right | |
1330 | * kmem_list3 and not this cpu's kmem_list3 | |
1331 | */ | |
8f9f8d9e DR |
1332 | err = init_cache_nodelists_node(node); |
1333 | if (err < 0) | |
1334 | goto bad; | |
fbf1e473 AM |
1335 | |
1336 | /* | |
1337 | * Now we can go ahead with allocating the shared arrays and | |
1338 | * array caches | |
1339 | */ | |
18004c5d | 1340 | list_for_each_entry(cachep, &slab_caches, list) { |
fbf1e473 AM |
1341 | struct array_cache *nc; |
1342 | struct array_cache *shared = NULL; | |
1343 | struct array_cache **alien = NULL; | |
1344 | ||
1345 | nc = alloc_arraycache(node, cachep->limit, | |
83b519e8 | 1346 | cachep->batchcount, GFP_KERNEL); |
fbf1e473 AM |
1347 | if (!nc) |
1348 | goto bad; | |
1349 | if (cachep->shared) { | |
1350 | shared = alloc_arraycache(node, | |
1351 | cachep->shared * cachep->batchcount, | |
83b519e8 | 1352 | 0xbaadf00d, GFP_KERNEL); |
12d00f6a AM |
1353 | if (!shared) { |
1354 | kfree(nc); | |
1da177e4 | 1355 | goto bad; |
12d00f6a | 1356 | } |
fbf1e473 AM |
1357 | } |
1358 | if (use_alien_caches) { | |
83b519e8 | 1359 | alien = alloc_alien_cache(node, cachep->limit, GFP_KERNEL); |
12d00f6a AM |
1360 | if (!alien) { |
1361 | kfree(shared); | |
1362 | kfree(nc); | |
fbf1e473 | 1363 | goto bad; |
12d00f6a | 1364 | } |
fbf1e473 AM |
1365 | } |
1366 | cachep->array[cpu] = nc; | |
1367 | l3 = cachep->nodelists[node]; | |
1368 | BUG_ON(!l3); | |
1369 | ||
1370 | spin_lock_irq(&l3->list_lock); | |
1371 | if (!l3->shared) { | |
1372 | /* | |
1373 | * We are serialised from CPU_DEAD or | |
1374 | * CPU_UP_CANCELLED by the cpucontrol lock | |
1375 | */ | |
1376 | l3->shared = shared; | |
1377 | shared = NULL; | |
1378 | } | |
4484ebf1 | 1379 | #ifdef CONFIG_NUMA |
fbf1e473 AM |
1380 | if (!l3->alien) { |
1381 | l3->alien = alien; | |
1382 | alien = NULL; | |
1da177e4 | 1383 | } |
fbf1e473 AM |
1384 | #endif |
1385 | spin_unlock_irq(&l3->list_lock); | |
1386 | kfree(shared); | |
1387 | free_alien_cache(alien); | |
83835b3d PZ |
1388 | if (cachep->flags & SLAB_DEBUG_OBJECTS) |
1389 | slab_set_debugobj_lock_classes_node(cachep, node); | |
fbf1e473 | 1390 | } |
ce79ddc8 PE |
1391 | init_node_lock_keys(node); |
1392 | ||
fbf1e473 AM |
1393 | return 0; |
1394 | bad: | |
12d00f6a | 1395 | cpuup_canceled(cpu); |
fbf1e473 AM |
1396 | return -ENOMEM; |
1397 | } | |
1398 | ||
1399 | static int __cpuinit cpuup_callback(struct notifier_block *nfb, | |
1400 | unsigned long action, void *hcpu) | |
1401 | { | |
1402 | long cpu = (long)hcpu; | |
1403 | int err = 0; | |
1404 | ||
1405 | switch (action) { | |
fbf1e473 AM |
1406 | case CPU_UP_PREPARE: |
1407 | case CPU_UP_PREPARE_FROZEN: | |
18004c5d | 1408 | mutex_lock(&slab_mutex); |
fbf1e473 | 1409 | err = cpuup_prepare(cpu); |
18004c5d | 1410 | mutex_unlock(&slab_mutex); |
1da177e4 LT |
1411 | break; |
1412 | case CPU_ONLINE: | |
8bb78442 | 1413 | case CPU_ONLINE_FROZEN: |
1da177e4 LT |
1414 | start_cpu_timer(cpu); |
1415 | break; | |
1416 | #ifdef CONFIG_HOTPLUG_CPU | |
5830c590 | 1417 | case CPU_DOWN_PREPARE: |
8bb78442 | 1418 | case CPU_DOWN_PREPARE_FROZEN: |
5830c590 | 1419 | /* |
18004c5d | 1420 | * Shutdown cache reaper. Note that the slab_mutex is |
5830c590 CL |
1421 | * held so that if cache_reap() is invoked it cannot do |
1422 | * anything expensive but will only modify reap_work | |
1423 | * and reschedule the timer. | |
1424 | */ | |
afe2c511 | 1425 | cancel_delayed_work_sync(&per_cpu(slab_reap_work, cpu)); |
5830c590 | 1426 | /* Now the cache_reaper is guaranteed to be not running. */ |
1871e52c | 1427 | per_cpu(slab_reap_work, cpu).work.func = NULL; |
5830c590 CL |
1428 | break; |
1429 | case CPU_DOWN_FAILED: | |
8bb78442 | 1430 | case CPU_DOWN_FAILED_FROZEN: |
5830c590 CL |
1431 | start_cpu_timer(cpu); |
1432 | break; | |
1da177e4 | 1433 | case CPU_DEAD: |
8bb78442 | 1434 | case CPU_DEAD_FROZEN: |
4484ebf1 RT |
1435 | /* |
1436 | * Even if all the cpus of a node are down, we don't free the | |
1437 | * kmem_list3 of any cache. This to avoid a race between | |
1438 | * cpu_down, and a kmalloc allocation from another cpu for | |
1439 | * memory from the node of the cpu going down. The list3 | |
1440 | * structure is usually allocated from kmem_cache_create() and | |
1441 | * gets destroyed at kmem_cache_destroy(). | |
1442 | */ | |
183ff22b | 1443 | /* fall through */ |
8f5be20b | 1444 | #endif |
1da177e4 | 1445 | case CPU_UP_CANCELED: |
8bb78442 | 1446 | case CPU_UP_CANCELED_FROZEN: |
18004c5d | 1447 | mutex_lock(&slab_mutex); |
fbf1e473 | 1448 | cpuup_canceled(cpu); |
18004c5d | 1449 | mutex_unlock(&slab_mutex); |
1da177e4 | 1450 | break; |
1da177e4 | 1451 | } |
eac40680 | 1452 | return notifier_from_errno(err); |
1da177e4 LT |
1453 | } |
1454 | ||
74b85f37 CS |
1455 | static struct notifier_block __cpuinitdata cpucache_notifier = { |
1456 | &cpuup_callback, NULL, 0 | |
1457 | }; | |
1da177e4 | 1458 | |
8f9f8d9e DR |
1459 | #if defined(CONFIG_NUMA) && defined(CONFIG_MEMORY_HOTPLUG) |
1460 | /* | |
1461 | * Drains freelist for a node on each slab cache, used for memory hot-remove. | |
1462 | * Returns -EBUSY if all objects cannot be drained so that the node is not | |
1463 | * removed. | |
1464 | * | |
18004c5d | 1465 | * Must hold slab_mutex. |
8f9f8d9e DR |
1466 | */ |
1467 | static int __meminit drain_cache_nodelists_node(int node) | |
1468 | { | |
1469 | struct kmem_cache *cachep; | |
1470 | int ret = 0; | |
1471 | ||
18004c5d | 1472 | list_for_each_entry(cachep, &slab_caches, list) { |
8f9f8d9e DR |
1473 | struct kmem_list3 *l3; |
1474 | ||
1475 | l3 = cachep->nodelists[node]; | |
1476 | if (!l3) | |
1477 | continue; | |
1478 | ||
1479 | drain_freelist(cachep, l3, l3->free_objects); | |
1480 | ||
1481 | if (!list_empty(&l3->slabs_full) || | |
1482 | !list_empty(&l3->slabs_partial)) { | |
1483 | ret = -EBUSY; | |
1484 | break; | |
1485 | } | |
1486 | } | |
1487 | return ret; | |
1488 | } | |
1489 | ||
1490 | static int __meminit slab_memory_callback(struct notifier_block *self, | |
1491 | unsigned long action, void *arg) | |
1492 | { | |
1493 | struct memory_notify *mnb = arg; | |
1494 | int ret = 0; | |
1495 | int nid; | |
1496 | ||
1497 | nid = mnb->status_change_nid; | |
1498 | if (nid < 0) | |
1499 | goto out; | |
1500 | ||
1501 | switch (action) { | |
1502 | case MEM_GOING_ONLINE: | |
18004c5d | 1503 | mutex_lock(&slab_mutex); |
8f9f8d9e | 1504 | ret = init_cache_nodelists_node(nid); |
18004c5d | 1505 | mutex_unlock(&slab_mutex); |
8f9f8d9e DR |
1506 | break; |
1507 | case MEM_GOING_OFFLINE: | |
18004c5d | 1508 | mutex_lock(&slab_mutex); |
8f9f8d9e | 1509 | ret = drain_cache_nodelists_node(nid); |
18004c5d | 1510 | mutex_unlock(&slab_mutex); |
8f9f8d9e DR |
1511 | break; |
1512 | case MEM_ONLINE: | |
1513 | case MEM_OFFLINE: | |
1514 | case MEM_CANCEL_ONLINE: | |
1515 | case MEM_CANCEL_OFFLINE: | |
1516 | break; | |
1517 | } | |
1518 | out: | |
5fda1bd5 | 1519 | return notifier_from_errno(ret); |
8f9f8d9e DR |
1520 | } |
1521 | #endif /* CONFIG_NUMA && CONFIG_MEMORY_HOTPLUG */ | |
1522 | ||
e498be7d CL |
1523 | /* |
1524 | * swap the static kmem_list3 with kmalloced memory | |
1525 | */ | |
8f9f8d9e DR |
1526 | static void __init init_list(struct kmem_cache *cachep, struct kmem_list3 *list, |
1527 | int nodeid) | |
e498be7d CL |
1528 | { |
1529 | struct kmem_list3 *ptr; | |
1530 | ||
83b519e8 | 1531 | ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_NOWAIT, nodeid); |
e498be7d CL |
1532 | BUG_ON(!ptr); |
1533 | ||
e498be7d | 1534 | memcpy(ptr, list, sizeof(struct kmem_list3)); |
2b2d5493 IM |
1535 | /* |
1536 | * Do not assume that spinlocks can be initialized via memcpy: | |
1537 | */ | |
1538 | spin_lock_init(&ptr->list_lock); | |
1539 | ||
e498be7d CL |
1540 | MAKE_ALL_LISTS(cachep, ptr, nodeid); |
1541 | cachep->nodelists[nodeid] = ptr; | |
e498be7d CL |
1542 | } |
1543 | ||
556a169d PE |
1544 | /* |
1545 | * For setting up all the kmem_list3s for cache whose buffer_size is same as | |
1546 | * size of kmem_list3. | |
1547 | */ | |
1548 | static void __init set_up_list3s(struct kmem_cache *cachep, int index) | |
1549 | { | |
1550 | int node; | |
1551 | ||
1552 | for_each_online_node(node) { | |
1553 | cachep->nodelists[node] = &initkmem_list3[index + node]; | |
1554 | cachep->nodelists[node]->next_reap = jiffies + | |
1555 | REAPTIMEOUT_LIST3 + | |
1556 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
1557 | } | |
1558 | } | |
1559 | ||
3c583465 CL |
1560 | /* |
1561 | * The memory after the last cpu cache pointer is used for the | |
1562 | * the nodelists pointer. | |
1563 | */ | |
1564 | static void setup_nodelists_pointer(struct kmem_cache *cachep) | |
1565 | { | |
1566 | cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids]; | |
1567 | } | |
1568 | ||
a737b3e2 AM |
1569 | /* |
1570 | * Initialisation. Called after the page allocator have been initialised and | |
1571 | * before smp_init(). | |
1da177e4 LT |
1572 | */ |
1573 | void __init kmem_cache_init(void) | |
1574 | { | |
1575 | size_t left_over; | |
1576 | struct cache_sizes *sizes; | |
1577 | struct cache_names *names; | |
e498be7d | 1578 | int i; |
07ed76b2 | 1579 | int order; |
1ca4cb24 | 1580 | int node; |
e498be7d | 1581 | |
9b030cb8 | 1582 | kmem_cache = &kmem_cache_boot; |
3c583465 | 1583 | setup_nodelists_pointer(kmem_cache); |
9b030cb8 | 1584 | |
b6e68bc1 | 1585 | if (num_possible_nodes() == 1) |
62918a03 SS |
1586 | use_alien_caches = 0; |
1587 | ||
3c583465 | 1588 | for (i = 0; i < NUM_INIT_LISTS; i++) |
e498be7d | 1589 | kmem_list3_init(&initkmem_list3[i]); |
3c583465 | 1590 | |
9b030cb8 | 1591 | set_up_list3s(kmem_cache, CACHE_CACHE); |
1da177e4 LT |
1592 | |
1593 | /* | |
1594 | * Fragmentation resistance on low memory - only use bigger | |
3df1cccd DR |
1595 | * page orders on machines with more than 32MB of memory if |
1596 | * not overridden on the command line. | |
1da177e4 | 1597 | */ |
3df1cccd | 1598 | if (!slab_max_order_set && totalram_pages > (32 << 20) >> PAGE_SHIFT) |
543585cc | 1599 | slab_max_order = SLAB_MAX_ORDER_HI; |
1da177e4 | 1600 | |
1da177e4 LT |
1601 | /* Bootstrap is tricky, because several objects are allocated |
1602 | * from caches that do not exist yet: | |
9b030cb8 CL |
1603 | * 1) initialize the kmem_cache cache: it contains the struct |
1604 | * kmem_cache structures of all caches, except kmem_cache itself: | |
1605 | * kmem_cache is statically allocated. | |
e498be7d CL |
1606 | * Initially an __init data area is used for the head array and the |
1607 | * kmem_list3 structures, it's replaced with a kmalloc allocated | |
1608 | * array at the end of the bootstrap. | |
1da177e4 | 1609 | * 2) Create the first kmalloc cache. |
343e0d7a | 1610 | * The struct kmem_cache for the new cache is allocated normally. |
e498be7d CL |
1611 | * An __init data area is used for the head array. |
1612 | * 3) Create the remaining kmalloc caches, with minimally sized | |
1613 | * head arrays. | |
9b030cb8 | 1614 | * 4) Replace the __init data head arrays for kmem_cache and the first |
1da177e4 | 1615 | * kmalloc cache with kmalloc allocated arrays. |
9b030cb8 | 1616 | * 5) Replace the __init data for kmem_list3 for kmem_cache and |
e498be7d CL |
1617 | * the other cache's with kmalloc allocated memory. |
1618 | * 6) Resize the head arrays of the kmalloc caches to their final sizes. | |
1da177e4 LT |
1619 | */ |
1620 | ||
7d6e6d09 | 1621 | node = numa_mem_id(); |
1ca4cb24 | 1622 | |
9b030cb8 | 1623 | /* 1) create the kmem_cache */ |
18004c5d | 1624 | INIT_LIST_HEAD(&slab_caches); |
9b030cb8 CL |
1625 | list_add(&kmem_cache->list, &slab_caches); |
1626 | kmem_cache->colour_off = cache_line_size(); | |
1627 | kmem_cache->array[smp_processor_id()] = &initarray_cache.cache; | |
1da177e4 | 1628 | |
8da3430d | 1629 | /* |
b56efcf0 | 1630 | * struct kmem_cache size depends on nr_node_ids & nr_cpu_ids |
8da3430d | 1631 | */ |
9b030cb8 | 1632 | kmem_cache->size = offsetof(struct kmem_cache, array[nr_cpu_ids]) + |
b56efcf0 | 1633 | nr_node_ids * sizeof(struct kmem_list3 *); |
9b030cb8 CL |
1634 | kmem_cache->object_size = kmem_cache->size; |
1635 | kmem_cache->size = ALIGN(kmem_cache->object_size, | |
a737b3e2 | 1636 | cache_line_size()); |
9b030cb8 CL |
1637 | kmem_cache->reciprocal_buffer_size = |
1638 | reciprocal_value(kmem_cache->size); | |
1da177e4 | 1639 | |
07ed76b2 | 1640 | for (order = 0; order < MAX_ORDER; order++) { |
9b030cb8 CL |
1641 | cache_estimate(order, kmem_cache->size, |
1642 | cache_line_size(), 0, &left_over, &kmem_cache->num); | |
1643 | if (kmem_cache->num) | |
07ed76b2 JS |
1644 | break; |
1645 | } | |
9b030cb8 CL |
1646 | BUG_ON(!kmem_cache->num); |
1647 | kmem_cache->gfporder = order; | |
1648 | kmem_cache->colour = left_over / kmem_cache->colour_off; | |
1649 | kmem_cache->slab_size = ALIGN(kmem_cache->num * sizeof(kmem_bufctl_t) + | |
b28a02de | 1650 | sizeof(struct slab), cache_line_size()); |
1da177e4 LT |
1651 | |
1652 | /* 2+3) create the kmalloc caches */ | |
1653 | sizes = malloc_sizes; | |
1654 | names = cache_names; | |
1655 | ||
a737b3e2 AM |
1656 | /* |
1657 | * Initialize the caches that provide memory for the array cache and the | |
1658 | * kmem_list3 structures first. Without this, further allocations will | |
1659 | * bug. | |
e498be7d CL |
1660 | */ |
1661 | ||
278b1bb1 | 1662 | sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
8a13a4cc CL |
1663 | sizes[INDEX_AC].cs_cachep->name = names[INDEX_AC].name; |
1664 | sizes[INDEX_AC].cs_cachep->size = sizes[INDEX_AC].cs_size; | |
1665 | sizes[INDEX_AC].cs_cachep->object_size = sizes[INDEX_AC].cs_size; | |
1666 | sizes[INDEX_AC].cs_cachep->align = ARCH_KMALLOC_MINALIGN; | |
1667 | __kmem_cache_create(sizes[INDEX_AC].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC); | |
7c9adf5a | 1668 | list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches); |
e498be7d | 1669 | |
a737b3e2 | 1670 | if (INDEX_AC != INDEX_L3) { |
278b1bb1 | 1671 | sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
8a13a4cc CL |
1672 | sizes[INDEX_L3].cs_cachep->name = names[INDEX_L3].name; |
1673 | sizes[INDEX_L3].cs_cachep->size = sizes[INDEX_L3].cs_size; | |
1674 | sizes[INDEX_L3].cs_cachep->object_size = sizes[INDEX_L3].cs_size; | |
1675 | sizes[INDEX_L3].cs_cachep->align = ARCH_KMALLOC_MINALIGN; | |
1676 | __kmem_cache_create(sizes[INDEX_L3].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC); | |
7c9adf5a | 1677 | list_add(&sizes[INDEX_L3].cs_cachep->list, &slab_caches); |
a737b3e2 | 1678 | } |
e498be7d | 1679 | |
e0a42726 IM |
1680 | slab_early_init = 0; |
1681 | ||
1da177e4 | 1682 | while (sizes->cs_size != ULONG_MAX) { |
e498be7d CL |
1683 | /* |
1684 | * For performance, all the general caches are L1 aligned. | |
1da177e4 LT |
1685 | * This should be particularly beneficial on SMP boxes, as it |
1686 | * eliminates "false sharing". | |
1687 | * Note for systems short on memory removing the alignment will | |
e498be7d CL |
1688 | * allow tighter packing of the smaller caches. |
1689 | */ | |
a737b3e2 | 1690 | if (!sizes->cs_cachep) { |
278b1bb1 | 1691 | sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
8a13a4cc CL |
1692 | sizes->cs_cachep->name = names->name; |
1693 | sizes->cs_cachep->size = sizes->cs_size; | |
1694 | sizes->cs_cachep->object_size = sizes->cs_size; | |
1695 | sizes->cs_cachep->align = ARCH_KMALLOC_MINALIGN; | |
1696 | __kmem_cache_create(sizes->cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC); | |
7c9adf5a | 1697 | list_add(&sizes->cs_cachep->list, &slab_caches); |
a737b3e2 | 1698 | } |
4b51d669 | 1699 | #ifdef CONFIG_ZONE_DMA |
278b1bb1 | 1700 | sizes->cs_dmacachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
8a13a4cc CL |
1701 | sizes->cs_dmacachep->name = names->name_dma; |
1702 | sizes->cs_dmacachep->size = sizes->cs_size; | |
1703 | sizes->cs_dmacachep->object_size = sizes->cs_size; | |
1704 | sizes->cs_dmacachep->align = ARCH_KMALLOC_MINALIGN; | |
278b1bb1 | 1705 | __kmem_cache_create(sizes->cs_dmacachep, |
8a13a4cc | 1706 | ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC); |
7c9adf5a | 1707 | list_add(&sizes->cs_dmacachep->list, &slab_caches); |
4b51d669 | 1708 | #endif |
1da177e4 LT |
1709 | sizes++; |
1710 | names++; | |
1711 | } | |
1712 | /* 4) Replace the bootstrap head arrays */ | |
1713 | { | |
2b2d5493 | 1714 | struct array_cache *ptr; |
e498be7d | 1715 | |
83b519e8 | 1716 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); |
e498be7d | 1717 | |
9b030cb8 CL |
1718 | BUG_ON(cpu_cache_get(kmem_cache) != &initarray_cache.cache); |
1719 | memcpy(ptr, cpu_cache_get(kmem_cache), | |
b28a02de | 1720 | sizeof(struct arraycache_init)); |
2b2d5493 IM |
1721 | /* |
1722 | * Do not assume that spinlocks can be initialized via memcpy: | |
1723 | */ | |
1724 | spin_lock_init(&ptr->lock); | |
1725 | ||
9b030cb8 | 1726 | kmem_cache->array[smp_processor_id()] = ptr; |
e498be7d | 1727 | |
83b519e8 | 1728 | ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); |
e498be7d | 1729 | |
9a2dba4b | 1730 | BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep) |
b28a02de | 1731 | != &initarray_generic.cache); |
9a2dba4b | 1732 | memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), |
b28a02de | 1733 | sizeof(struct arraycache_init)); |
2b2d5493 IM |
1734 | /* |
1735 | * Do not assume that spinlocks can be initialized via memcpy: | |
1736 | */ | |
1737 | spin_lock_init(&ptr->lock); | |
1738 | ||
e498be7d | 1739 | malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = |
b28a02de | 1740 | ptr; |
1da177e4 | 1741 | } |
e498be7d CL |
1742 | /* 5) Replace the bootstrap kmem_list3's */ |
1743 | { | |
1ca4cb24 PE |
1744 | int nid; |
1745 | ||
9c09a95c | 1746 | for_each_online_node(nid) { |
9b030cb8 | 1747 | init_list(kmem_cache, &initkmem_list3[CACHE_CACHE + nid], nid); |
556a169d | 1748 | |
e498be7d | 1749 | init_list(malloc_sizes[INDEX_AC].cs_cachep, |
1ca4cb24 | 1750 | &initkmem_list3[SIZE_AC + nid], nid); |
e498be7d CL |
1751 | |
1752 | if (INDEX_AC != INDEX_L3) { | |
1753 | init_list(malloc_sizes[INDEX_L3].cs_cachep, | |
1ca4cb24 | 1754 | &initkmem_list3[SIZE_L3 + nid], nid); |
e498be7d CL |
1755 | } |
1756 | } | |
1757 | } | |
1da177e4 | 1758 | |
97d06609 | 1759 | slab_state = UP; |
8429db5c PE |
1760 | } |
1761 | ||
1762 | void __init kmem_cache_init_late(void) | |
1763 | { | |
1764 | struct kmem_cache *cachep; | |
1765 | ||
97d06609 | 1766 | slab_state = UP; |
52cef189 | 1767 | |
8429db5c | 1768 | /* 6) resize the head arrays to their final sizes */ |
18004c5d CL |
1769 | mutex_lock(&slab_mutex); |
1770 | list_for_each_entry(cachep, &slab_caches, list) | |
8429db5c PE |
1771 | if (enable_cpucache(cachep, GFP_NOWAIT)) |
1772 | BUG(); | |
18004c5d | 1773 | mutex_unlock(&slab_mutex); |
056c6241 | 1774 | |
947ca185 MW |
1775 | /* Annotate slab for lockdep -- annotate the malloc caches */ |
1776 | init_lock_keys(); | |
1777 | ||
97d06609 CL |
1778 | /* Done! */ |
1779 | slab_state = FULL; | |
1780 | ||
a737b3e2 AM |
1781 | /* |
1782 | * Register a cpu startup notifier callback that initializes | |
1783 | * cpu_cache_get for all new cpus | |
1da177e4 LT |
1784 | */ |
1785 | register_cpu_notifier(&cpucache_notifier); | |
1da177e4 | 1786 | |
8f9f8d9e DR |
1787 | #ifdef CONFIG_NUMA |
1788 | /* | |
1789 | * Register a memory hotplug callback that initializes and frees | |
1790 | * nodelists. | |
1791 | */ | |
1792 | hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI); | |
1793 | #endif | |
1794 | ||
a737b3e2 AM |
1795 | /* |
1796 | * The reap timers are started later, with a module init call: That part | |
1797 | * of the kernel is not yet operational. | |
1da177e4 LT |
1798 | */ |
1799 | } | |
1800 | ||
1801 | static int __init cpucache_init(void) | |
1802 | { | |
1803 | int cpu; | |
1804 | ||
a737b3e2 AM |
1805 | /* |
1806 | * Register the timers that return unneeded pages to the page allocator | |
1da177e4 | 1807 | */ |
e498be7d | 1808 | for_each_online_cpu(cpu) |
a737b3e2 | 1809 | start_cpu_timer(cpu); |
a164f896 GC |
1810 | |
1811 | /* Done! */ | |
97d06609 | 1812 | slab_state = FULL; |
1da177e4 LT |
1813 | return 0; |
1814 | } | |
1da177e4 LT |
1815 | __initcall(cpucache_init); |
1816 | ||
8bdec192 RA |
1817 | static noinline void |
1818 | slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid) | |
1819 | { | |
1820 | struct kmem_list3 *l3; | |
1821 | struct slab *slabp; | |
1822 | unsigned long flags; | |
1823 | int node; | |
1824 | ||
1825 | printk(KERN_WARNING | |
1826 | "SLAB: Unable to allocate memory on node %d (gfp=0x%x)\n", | |
1827 | nodeid, gfpflags); | |
1828 | printk(KERN_WARNING " cache: %s, object size: %d, order: %d\n", | |
3b0efdfa | 1829 | cachep->name, cachep->size, cachep->gfporder); |
8bdec192 RA |
1830 | |
1831 | for_each_online_node(node) { | |
1832 | unsigned long active_objs = 0, num_objs = 0, free_objects = 0; | |
1833 | unsigned long active_slabs = 0, num_slabs = 0; | |
1834 | ||
1835 | l3 = cachep->nodelists[node]; | |
1836 | if (!l3) | |
1837 | continue; | |
1838 | ||
1839 | spin_lock_irqsave(&l3->list_lock, flags); | |
1840 | list_for_each_entry(slabp, &l3->slabs_full, list) { | |
1841 | active_objs += cachep->num; | |
1842 | active_slabs++; | |
1843 | } | |
1844 | list_for_each_entry(slabp, &l3->slabs_partial, list) { | |
1845 | active_objs += slabp->inuse; | |
1846 | active_slabs++; | |
1847 | } | |
1848 | list_for_each_entry(slabp, &l3->slabs_free, list) | |
1849 | num_slabs++; | |
1850 | ||
1851 | free_objects += l3->free_objects; | |
1852 | spin_unlock_irqrestore(&l3->list_lock, flags); | |
1853 | ||
1854 | num_slabs += active_slabs; | |
1855 | num_objs = num_slabs * cachep->num; | |
1856 | printk(KERN_WARNING | |
1857 | " node %d: slabs: %ld/%ld, objs: %ld/%ld, free: %ld\n", | |
1858 | node, active_slabs, num_slabs, active_objs, num_objs, | |
1859 | free_objects); | |
1860 | } | |
1861 | } | |
1862 | ||
1da177e4 LT |
1863 | /* |
1864 | * Interface to system's page allocator. No need to hold the cache-lock. | |
1865 | * | |
1866 | * If we requested dmaable memory, we will get it. Even if we | |
1867 | * did not request dmaable memory, we might get it, but that | |
1868 | * would be relatively rare and ignorable. | |
1869 | */ | |
343e0d7a | 1870 | static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
1da177e4 LT |
1871 | { |
1872 | struct page *page; | |
e1b6aa6f | 1873 | int nr_pages; |
1da177e4 LT |
1874 | int i; |
1875 | ||
d6fef9da | 1876 | #ifndef CONFIG_MMU |
e1b6aa6f CH |
1877 | /* |
1878 | * Nommu uses slab's for process anonymous memory allocations, and thus | |
1879 | * requires __GFP_COMP to properly refcount higher order allocations | |
d6fef9da | 1880 | */ |
e1b6aa6f | 1881 | flags |= __GFP_COMP; |
d6fef9da | 1882 | #endif |
765c4507 | 1883 | |
a618e89f | 1884 | flags |= cachep->allocflags; |
e12ba74d MG |
1885 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
1886 | flags |= __GFP_RECLAIMABLE; | |
e1b6aa6f | 1887 | |
517d0869 | 1888 | page = alloc_pages_exact_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder); |
8bdec192 RA |
1889 | if (!page) { |
1890 | if (!(flags & __GFP_NOWARN) && printk_ratelimit()) | |
1891 | slab_out_of_memory(cachep, flags, nodeid); | |
1da177e4 | 1892 | return NULL; |
8bdec192 | 1893 | } |
1da177e4 | 1894 | |
b37f1dd0 | 1895 | /* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */ |
072bb0aa MG |
1896 | if (unlikely(page->pfmemalloc)) |
1897 | pfmemalloc_active = true; | |
1898 | ||
e1b6aa6f | 1899 | nr_pages = (1 << cachep->gfporder); |
1da177e4 | 1900 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
972d1a7b CL |
1901 | add_zone_page_state(page_zone(page), |
1902 | NR_SLAB_RECLAIMABLE, nr_pages); | |
1903 | else | |
1904 | add_zone_page_state(page_zone(page), | |
1905 | NR_SLAB_UNRECLAIMABLE, nr_pages); | |
072bb0aa | 1906 | for (i = 0; i < nr_pages; i++) { |
e1b6aa6f | 1907 | __SetPageSlab(page + i); |
c175eea4 | 1908 | |
072bb0aa MG |
1909 | if (page->pfmemalloc) |
1910 | SetPageSlabPfmemalloc(page + i); | |
1911 | } | |
1912 | ||
b1eeab67 VN |
1913 | if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK)) { |
1914 | kmemcheck_alloc_shadow(page, cachep->gfporder, flags, nodeid); | |
1915 | ||
1916 | if (cachep->ctor) | |
1917 | kmemcheck_mark_uninitialized_pages(page, nr_pages); | |
1918 | else | |
1919 | kmemcheck_mark_unallocated_pages(page, nr_pages); | |
1920 | } | |
c175eea4 | 1921 | |
e1b6aa6f | 1922 | return page_address(page); |
1da177e4 LT |
1923 | } |
1924 | ||
1925 | /* | |
1926 | * Interface to system's page release. | |
1927 | */ | |
343e0d7a | 1928 | static void kmem_freepages(struct kmem_cache *cachep, void *addr) |
1da177e4 | 1929 | { |
b28a02de | 1930 | unsigned long i = (1 << cachep->gfporder); |
1da177e4 LT |
1931 | struct page *page = virt_to_page(addr); |
1932 | const unsigned long nr_freed = i; | |
1933 | ||
b1eeab67 | 1934 | kmemcheck_free_shadow(page, cachep->gfporder); |
c175eea4 | 1935 | |
972d1a7b CL |
1936 | if (cachep->flags & SLAB_RECLAIM_ACCOUNT) |
1937 | sub_zone_page_state(page_zone(page), | |
1938 | NR_SLAB_RECLAIMABLE, nr_freed); | |
1939 | else | |
1940 | sub_zone_page_state(page_zone(page), | |
1941 | NR_SLAB_UNRECLAIMABLE, nr_freed); | |
1da177e4 | 1942 | while (i--) { |
f205b2fe | 1943 | BUG_ON(!PageSlab(page)); |
072bb0aa | 1944 | __ClearPageSlabPfmemalloc(page); |
f205b2fe | 1945 | __ClearPageSlab(page); |
1da177e4 LT |
1946 | page++; |
1947 | } | |
1da177e4 LT |
1948 | if (current->reclaim_state) |
1949 | current->reclaim_state->reclaimed_slab += nr_freed; | |
1950 | free_pages((unsigned long)addr, cachep->gfporder); | |
1da177e4 LT |
1951 | } |
1952 | ||
1953 | static void kmem_rcu_free(struct rcu_head *head) | |
1954 | { | |
b28a02de | 1955 | struct slab_rcu *slab_rcu = (struct slab_rcu *)head; |
343e0d7a | 1956 | struct kmem_cache *cachep = slab_rcu->cachep; |
1da177e4 LT |
1957 | |
1958 | kmem_freepages(cachep, slab_rcu->addr); | |
1959 | if (OFF_SLAB(cachep)) | |
1960 | kmem_cache_free(cachep->slabp_cache, slab_rcu); | |
1961 | } | |
1962 | ||
1963 | #if DEBUG | |
1964 | ||
1965 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
343e0d7a | 1966 | static void store_stackinfo(struct kmem_cache *cachep, unsigned long *addr, |
b28a02de | 1967 | unsigned long caller) |
1da177e4 | 1968 | { |
8c138bc0 | 1969 | int size = cachep->object_size; |
1da177e4 | 1970 | |
3dafccf2 | 1971 | addr = (unsigned long *)&((char *)addr)[obj_offset(cachep)]; |
1da177e4 | 1972 | |
b28a02de | 1973 | if (size < 5 * sizeof(unsigned long)) |
1da177e4 LT |
1974 | return; |
1975 | ||
b28a02de PE |
1976 | *addr++ = 0x12345678; |
1977 | *addr++ = caller; | |
1978 | *addr++ = smp_processor_id(); | |
1979 | size -= 3 * sizeof(unsigned long); | |
1da177e4 LT |
1980 | { |
1981 | unsigned long *sptr = &caller; | |
1982 | unsigned long svalue; | |
1983 | ||
1984 | while (!kstack_end(sptr)) { | |
1985 | svalue = *sptr++; | |
1986 | if (kernel_text_address(svalue)) { | |
b28a02de | 1987 | *addr++ = svalue; |
1da177e4 LT |
1988 | size -= sizeof(unsigned long); |
1989 | if (size <= sizeof(unsigned long)) | |
1990 | break; | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | } | |
b28a02de | 1995 | *addr++ = 0x87654321; |
1da177e4 LT |
1996 | } |
1997 | #endif | |
1998 | ||
343e0d7a | 1999 | static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val) |
1da177e4 | 2000 | { |
8c138bc0 | 2001 | int size = cachep->object_size; |
3dafccf2 | 2002 | addr = &((char *)addr)[obj_offset(cachep)]; |
1da177e4 LT |
2003 | |
2004 | memset(addr, val, size); | |
b28a02de | 2005 | *(unsigned char *)(addr + size - 1) = POISON_END; |
1da177e4 LT |
2006 | } |
2007 | ||
2008 | static void dump_line(char *data, int offset, int limit) | |
2009 | { | |
2010 | int i; | |
aa83aa40 DJ |
2011 | unsigned char error = 0; |
2012 | int bad_count = 0; | |
2013 | ||
fdde6abb | 2014 | printk(KERN_ERR "%03x: ", offset); |
aa83aa40 DJ |
2015 | for (i = 0; i < limit; i++) { |
2016 | if (data[offset + i] != POISON_FREE) { | |
2017 | error = data[offset + i]; | |
2018 | bad_count++; | |
2019 | } | |
aa83aa40 | 2020 | } |
fdde6abb SAS |
2021 | print_hex_dump(KERN_CONT, "", 0, 16, 1, |
2022 | &data[offset], limit, 1); | |
aa83aa40 DJ |
2023 | |
2024 | if (bad_count == 1) { | |
2025 | error ^= POISON_FREE; | |
2026 | if (!(error & (error - 1))) { | |
2027 | printk(KERN_ERR "Single bit error detected. Probably " | |
2028 | "bad RAM.\n"); | |
2029 | #ifdef CONFIG_X86 | |
2030 | printk(KERN_ERR "Run memtest86+ or a similar memory " | |
2031 | "test tool.\n"); | |
2032 | #else | |
2033 | printk(KERN_ERR "Run a memory test tool.\n"); | |
2034 | #endif | |
2035 | } | |
2036 | } | |
1da177e4 LT |
2037 | } |
2038 | #endif | |
2039 | ||
2040 | #if DEBUG | |
2041 | ||
343e0d7a | 2042 | static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines) |
1da177e4 LT |
2043 | { |
2044 | int i, size; | |
2045 | char *realobj; | |
2046 | ||
2047 | if (cachep->flags & SLAB_RED_ZONE) { | |
b46b8f19 | 2048 | printk(KERN_ERR "Redzone: 0x%llx/0x%llx.\n", |
a737b3e2 AM |
2049 | *dbg_redzone1(cachep, objp), |
2050 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
2051 | } |
2052 | ||
2053 | if (cachep->flags & SLAB_STORE_USER) { | |
2054 | printk(KERN_ERR "Last user: [<%p>]", | |
a737b3e2 | 2055 | *dbg_userword(cachep, objp)); |
1da177e4 | 2056 | print_symbol("(%s)", |
a737b3e2 | 2057 | (unsigned long)*dbg_userword(cachep, objp)); |
1da177e4 LT |
2058 | printk("\n"); |
2059 | } | |
3dafccf2 | 2060 | realobj = (char *)objp + obj_offset(cachep); |
8c138bc0 | 2061 | size = cachep->object_size; |
b28a02de | 2062 | for (i = 0; i < size && lines; i += 16, lines--) { |
1da177e4 LT |
2063 | int limit; |
2064 | limit = 16; | |
b28a02de PE |
2065 | if (i + limit > size) |
2066 | limit = size - i; | |
1da177e4 LT |
2067 | dump_line(realobj, i, limit); |
2068 | } | |
2069 | } | |
2070 | ||
343e0d7a | 2071 | static void check_poison_obj(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
2072 | { |
2073 | char *realobj; | |
2074 | int size, i; | |
2075 | int lines = 0; | |
2076 | ||
3dafccf2 | 2077 | realobj = (char *)objp + obj_offset(cachep); |
8c138bc0 | 2078 | size = cachep->object_size; |
1da177e4 | 2079 | |
b28a02de | 2080 | for (i = 0; i < size; i++) { |
1da177e4 | 2081 | char exp = POISON_FREE; |
b28a02de | 2082 | if (i == size - 1) |
1da177e4 LT |
2083 | exp = POISON_END; |
2084 | if (realobj[i] != exp) { | |
2085 | int limit; | |
2086 | /* Mismatch ! */ | |
2087 | /* Print header */ | |
2088 | if (lines == 0) { | |
b28a02de | 2089 | printk(KERN_ERR |
face37f5 DJ |
2090 | "Slab corruption (%s): %s start=%p, len=%d\n", |
2091 | print_tainted(), cachep->name, realobj, size); | |
1da177e4 LT |
2092 | print_objinfo(cachep, objp, 0); |
2093 | } | |
2094 | /* Hexdump the affected line */ | |
b28a02de | 2095 | i = (i / 16) * 16; |
1da177e4 | 2096 | limit = 16; |
b28a02de PE |
2097 | if (i + limit > size) |
2098 | limit = size - i; | |
1da177e4 LT |
2099 | dump_line(realobj, i, limit); |
2100 | i += 16; | |
2101 | lines++; | |
2102 | /* Limit to 5 lines */ | |
2103 | if (lines > 5) | |
2104 | break; | |
2105 | } | |
2106 | } | |
2107 | if (lines != 0) { | |
2108 | /* Print some data about the neighboring objects, if they | |
2109 | * exist: | |
2110 | */ | |
6ed5eb22 | 2111 | struct slab *slabp = virt_to_slab(objp); |
8fea4e96 | 2112 | unsigned int objnr; |
1da177e4 | 2113 | |
8fea4e96 | 2114 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 | 2115 | if (objnr) { |
8fea4e96 | 2116 | objp = index_to_obj(cachep, slabp, objnr - 1); |
3dafccf2 | 2117 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 2118 | printk(KERN_ERR "Prev obj: start=%p, len=%d\n", |
b28a02de | 2119 | realobj, size); |
1da177e4 LT |
2120 | print_objinfo(cachep, objp, 2); |
2121 | } | |
b28a02de | 2122 | if (objnr + 1 < cachep->num) { |
8fea4e96 | 2123 | objp = index_to_obj(cachep, slabp, objnr + 1); |
3dafccf2 | 2124 | realobj = (char *)objp + obj_offset(cachep); |
1da177e4 | 2125 | printk(KERN_ERR "Next obj: start=%p, len=%d\n", |
b28a02de | 2126 | realobj, size); |
1da177e4 LT |
2127 | print_objinfo(cachep, objp, 2); |
2128 | } | |
2129 | } | |
2130 | } | |
2131 | #endif | |
2132 | ||
12dd36fa | 2133 | #if DEBUG |
e79aec29 | 2134 | static void slab_destroy_debugcheck(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 | 2135 | { |
1da177e4 LT |
2136 | int i; |
2137 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 2138 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
2139 | |
2140 | if (cachep->flags & SLAB_POISON) { | |
2141 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
3b0efdfa | 2142 | if (cachep->size % PAGE_SIZE == 0 && |
a737b3e2 | 2143 | OFF_SLAB(cachep)) |
b28a02de | 2144 | kernel_map_pages(virt_to_page(objp), |
3b0efdfa | 2145 | cachep->size / PAGE_SIZE, 1); |
1da177e4 LT |
2146 | else |
2147 | check_poison_obj(cachep, objp); | |
2148 | #else | |
2149 | check_poison_obj(cachep, objp); | |
2150 | #endif | |
2151 | } | |
2152 | if (cachep->flags & SLAB_RED_ZONE) { | |
2153 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) | |
2154 | slab_error(cachep, "start of a freed object " | |
b28a02de | 2155 | "was overwritten"); |
1da177e4 LT |
2156 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) |
2157 | slab_error(cachep, "end of a freed object " | |
b28a02de | 2158 | "was overwritten"); |
1da177e4 | 2159 | } |
1da177e4 | 2160 | } |
12dd36fa | 2161 | } |
1da177e4 | 2162 | #else |
e79aec29 | 2163 | static void slab_destroy_debugcheck(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa | 2164 | { |
12dd36fa | 2165 | } |
1da177e4 LT |
2166 | #endif |
2167 | ||
911851e6 RD |
2168 | /** |
2169 | * slab_destroy - destroy and release all objects in a slab | |
2170 | * @cachep: cache pointer being destroyed | |
2171 | * @slabp: slab pointer being destroyed | |
2172 | * | |
12dd36fa | 2173 | * Destroy all the objs in a slab, and release the mem back to the system. |
a737b3e2 AM |
2174 | * Before calling the slab must have been unlinked from the cache. The |
2175 | * cache-lock is not held/needed. | |
12dd36fa | 2176 | */ |
343e0d7a | 2177 | static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) |
12dd36fa MD |
2178 | { |
2179 | void *addr = slabp->s_mem - slabp->colouroff; | |
2180 | ||
e79aec29 | 2181 | slab_destroy_debugcheck(cachep, slabp); |
1da177e4 LT |
2182 | if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) { |
2183 | struct slab_rcu *slab_rcu; | |
2184 | ||
b28a02de | 2185 | slab_rcu = (struct slab_rcu *)slabp; |
1da177e4 LT |
2186 | slab_rcu->cachep = cachep; |
2187 | slab_rcu->addr = addr; | |
2188 | call_rcu(&slab_rcu->head, kmem_rcu_free); | |
2189 | } else { | |
2190 | kmem_freepages(cachep, addr); | |
873623df IM |
2191 | if (OFF_SLAB(cachep)) |
2192 | kmem_cache_free(cachep->slabp_cache, slabp); | |
1da177e4 LT |
2193 | } |
2194 | } | |
2195 | ||
4d268eba | 2196 | /** |
a70773dd RD |
2197 | * calculate_slab_order - calculate size (page order) of slabs |
2198 | * @cachep: pointer to the cache that is being created | |
2199 | * @size: size of objects to be created in this cache. | |
2200 | * @align: required alignment for the objects. | |
2201 | * @flags: slab allocation flags | |
2202 | * | |
2203 | * Also calculates the number of objects per slab. | |
4d268eba PE |
2204 | * |
2205 | * This could be made much more intelligent. For now, try to avoid using | |
2206 | * high order pages for slabs. When the gfp() functions are more friendly | |
2207 | * towards high-order requests, this should be changed. | |
2208 | */ | |
a737b3e2 | 2209 | static size_t calculate_slab_order(struct kmem_cache *cachep, |
ee13d785 | 2210 | size_t size, size_t align, unsigned long flags) |
4d268eba | 2211 | { |
b1ab41c4 | 2212 | unsigned long offslab_limit; |
4d268eba | 2213 | size_t left_over = 0; |
9888e6fa | 2214 | int gfporder; |
4d268eba | 2215 | |
0aa817f0 | 2216 | for (gfporder = 0; gfporder <= KMALLOC_MAX_ORDER; gfporder++) { |
4d268eba PE |
2217 | unsigned int num; |
2218 | size_t remainder; | |
2219 | ||
9888e6fa | 2220 | cache_estimate(gfporder, size, align, flags, &remainder, &num); |
4d268eba PE |
2221 | if (!num) |
2222 | continue; | |
9888e6fa | 2223 | |
b1ab41c4 IM |
2224 | if (flags & CFLGS_OFF_SLAB) { |
2225 | /* | |
2226 | * Max number of objs-per-slab for caches which | |
2227 | * use off-slab slabs. Needed to avoid a possible | |
2228 | * looping condition in cache_grow(). | |
2229 | */ | |
2230 | offslab_limit = size - sizeof(struct slab); | |
2231 | offslab_limit /= sizeof(kmem_bufctl_t); | |
2232 | ||
2233 | if (num > offslab_limit) | |
2234 | break; | |
2235 | } | |
4d268eba | 2236 | |
9888e6fa | 2237 | /* Found something acceptable - save it away */ |
4d268eba | 2238 | cachep->num = num; |
9888e6fa | 2239 | cachep->gfporder = gfporder; |
4d268eba PE |
2240 | left_over = remainder; |
2241 | ||
f78bb8ad LT |
2242 | /* |
2243 | * A VFS-reclaimable slab tends to have most allocations | |
2244 | * as GFP_NOFS and we really don't want to have to be allocating | |
2245 | * higher-order pages when we are unable to shrink dcache. | |
2246 | */ | |
2247 | if (flags & SLAB_RECLAIM_ACCOUNT) | |
2248 | break; | |
2249 | ||
4d268eba PE |
2250 | /* |
2251 | * Large number of objects is good, but very large slabs are | |
2252 | * currently bad for the gfp()s. | |
2253 | */ | |
543585cc | 2254 | if (gfporder >= slab_max_order) |
4d268eba PE |
2255 | break; |
2256 | ||
9888e6fa LT |
2257 | /* |
2258 | * Acceptable internal fragmentation? | |
2259 | */ | |
a737b3e2 | 2260 | if (left_over * 8 <= (PAGE_SIZE << gfporder)) |
4d268eba PE |
2261 | break; |
2262 | } | |
2263 | return left_over; | |
2264 | } | |
2265 | ||
83b519e8 | 2266 | static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) |
f30cf7d1 | 2267 | { |
97d06609 | 2268 | if (slab_state >= FULL) |
83b519e8 | 2269 | return enable_cpucache(cachep, gfp); |
2ed3a4ef | 2270 | |
97d06609 | 2271 | if (slab_state == DOWN) { |
f30cf7d1 PE |
2272 | /* |
2273 | * Note: the first kmem_cache_create must create the cache | |
2274 | * that's used by kmalloc(24), otherwise the creation of | |
2275 | * further caches will BUG(). | |
2276 | */ | |
2277 | cachep->array[smp_processor_id()] = &initarray_generic.cache; | |
2278 | ||
2279 | /* | |
2280 | * If the cache that's used by kmalloc(sizeof(kmem_list3)) is | |
2281 | * the first cache, then we need to set up all its list3s, | |
2282 | * otherwise the creation of further caches will BUG(). | |
2283 | */ | |
2284 | set_up_list3s(cachep, SIZE_AC); | |
2285 | if (INDEX_AC == INDEX_L3) | |
97d06609 | 2286 | slab_state = PARTIAL_L3; |
f30cf7d1 | 2287 | else |
97d06609 | 2288 | slab_state = PARTIAL_ARRAYCACHE; |
f30cf7d1 PE |
2289 | } else { |
2290 | cachep->array[smp_processor_id()] = | |
83b519e8 | 2291 | kmalloc(sizeof(struct arraycache_init), gfp); |
f30cf7d1 | 2292 | |
97d06609 | 2293 | if (slab_state == PARTIAL_ARRAYCACHE) { |
f30cf7d1 | 2294 | set_up_list3s(cachep, SIZE_L3); |
97d06609 | 2295 | slab_state = PARTIAL_L3; |
f30cf7d1 PE |
2296 | } else { |
2297 | int node; | |
556a169d | 2298 | for_each_online_node(node) { |
f30cf7d1 PE |
2299 | cachep->nodelists[node] = |
2300 | kmalloc_node(sizeof(struct kmem_list3), | |
eb91f1d0 | 2301 | gfp, node); |
f30cf7d1 PE |
2302 | BUG_ON(!cachep->nodelists[node]); |
2303 | kmem_list3_init(cachep->nodelists[node]); | |
2304 | } | |
2305 | } | |
2306 | } | |
7d6e6d09 | 2307 | cachep->nodelists[numa_mem_id()]->next_reap = |
f30cf7d1 PE |
2308 | jiffies + REAPTIMEOUT_LIST3 + |
2309 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; | |
2310 | ||
2311 | cpu_cache_get(cachep)->avail = 0; | |
2312 | cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; | |
2313 | cpu_cache_get(cachep)->batchcount = 1; | |
2314 | cpu_cache_get(cachep)->touched = 0; | |
2315 | cachep->batchcount = 1; | |
2316 | cachep->limit = BOOT_CPUCACHE_ENTRIES; | |
2ed3a4ef | 2317 | return 0; |
f30cf7d1 PE |
2318 | } |
2319 | ||
1da177e4 | 2320 | /** |
039363f3 | 2321 | * __kmem_cache_create - Create a cache. |
a755b76a | 2322 | * @cachep: cache management descriptor |
1da177e4 | 2323 | * @flags: SLAB flags |
1da177e4 LT |
2324 | * |
2325 | * Returns a ptr to the cache on success, NULL on failure. | |
2326 | * Cannot be called within a int, but can be interrupted. | |
20c2df83 | 2327 | * The @ctor is run when new pages are allocated by the cache. |
1da177e4 | 2328 | * |
1da177e4 LT |
2329 | * The flags are |
2330 | * | |
2331 | * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) | |
2332 | * to catch references to uninitialised memory. | |
2333 | * | |
2334 | * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check | |
2335 | * for buffer overruns. | |
2336 | * | |
1da177e4 LT |
2337 | * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware |
2338 | * cacheline. This can be beneficial if you're counting cycles as closely | |
2339 | * as davem. | |
2340 | */ | |
278b1bb1 | 2341 | int |
8a13a4cc | 2342 | __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) |
1da177e4 LT |
2343 | { |
2344 | size_t left_over, slab_size, ralign; | |
83b519e8 | 2345 | gfp_t gfp; |
278b1bb1 | 2346 | int err; |
8a13a4cc | 2347 | size_t size = cachep->size; |
1da177e4 | 2348 | |
1da177e4 | 2349 | #if DEBUG |
1da177e4 LT |
2350 | #if FORCED_DEBUG |
2351 | /* | |
2352 | * Enable redzoning and last user accounting, except for caches with | |
2353 | * large objects, if the increased size would increase the object size | |
2354 | * above the next power of two: caches with object sizes just above a | |
2355 | * power of two have a significant amount of internal fragmentation. | |
2356 | */ | |
87a927c7 DW |
2357 | if (size < 4096 || fls(size - 1) == fls(size-1 + REDZONE_ALIGN + |
2358 | 2 * sizeof(unsigned long long))) | |
b28a02de | 2359 | flags |= SLAB_RED_ZONE | SLAB_STORE_USER; |
1da177e4 LT |
2360 | if (!(flags & SLAB_DESTROY_BY_RCU)) |
2361 | flags |= SLAB_POISON; | |
2362 | #endif | |
2363 | if (flags & SLAB_DESTROY_BY_RCU) | |
2364 | BUG_ON(flags & SLAB_POISON); | |
2365 | #endif | |
1da177e4 | 2366 | |
a737b3e2 AM |
2367 | /* |
2368 | * Check that size is in terms of words. This is needed to avoid | |
1da177e4 LT |
2369 | * unaligned accesses for some archs when redzoning is used, and makes |
2370 | * sure any on-slab bufctl's are also correctly aligned. | |
2371 | */ | |
b28a02de PE |
2372 | if (size & (BYTES_PER_WORD - 1)) { |
2373 | size += (BYTES_PER_WORD - 1); | |
2374 | size &= ~(BYTES_PER_WORD - 1); | |
1da177e4 LT |
2375 | } |
2376 | ||
a737b3e2 AM |
2377 | /* calculate the final buffer alignment: */ |
2378 | ||
1da177e4 LT |
2379 | /* 1) arch recommendation: can be overridden for debug */ |
2380 | if (flags & SLAB_HWCACHE_ALIGN) { | |
a737b3e2 AM |
2381 | /* |
2382 | * Default alignment: as specified by the arch code. Except if | |
2383 | * an object is really small, then squeeze multiple objects into | |
2384 | * one cacheline. | |
1da177e4 LT |
2385 | */ |
2386 | ralign = cache_line_size(); | |
b28a02de | 2387 | while (size <= ralign / 2) |
1da177e4 LT |
2388 | ralign /= 2; |
2389 | } else { | |
2390 | ralign = BYTES_PER_WORD; | |
2391 | } | |
ca5f9703 PE |
2392 | |
2393 | /* | |
87a927c7 DW |
2394 | * Redzoning and user store require word alignment or possibly larger. |
2395 | * Note this will be overridden by architecture or caller mandated | |
2396 | * alignment if either is greater than BYTES_PER_WORD. | |
ca5f9703 | 2397 | */ |
87a927c7 DW |
2398 | if (flags & SLAB_STORE_USER) |
2399 | ralign = BYTES_PER_WORD; | |
2400 | ||
2401 | if (flags & SLAB_RED_ZONE) { | |
2402 | ralign = REDZONE_ALIGN; | |
2403 | /* If redzoning, ensure that the second redzone is suitably | |
2404 | * aligned, by adjusting the object size accordingly. */ | |
2405 | size += REDZONE_ALIGN - 1; | |
2406 | size &= ~(REDZONE_ALIGN - 1); | |
2407 | } | |
ca5f9703 | 2408 | |
a44b56d3 | 2409 | /* 2) arch mandated alignment */ |
1da177e4 LT |
2410 | if (ralign < ARCH_SLAB_MINALIGN) { |
2411 | ralign = ARCH_SLAB_MINALIGN; | |
1da177e4 | 2412 | } |
a44b56d3 | 2413 | /* 3) caller mandated alignment */ |
8a13a4cc CL |
2414 | if (ralign < cachep->align) { |
2415 | ralign = cachep->align; | |
1da177e4 | 2416 | } |
3ff84a7f PE |
2417 | /* disable debug if necessary */ |
2418 | if (ralign > __alignof__(unsigned long long)) | |
a44b56d3 | 2419 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); |
a737b3e2 | 2420 | /* |
ca5f9703 | 2421 | * 4) Store it. |
1da177e4 | 2422 | */ |
8a13a4cc | 2423 | cachep->align = ralign; |
1da177e4 | 2424 | |
83b519e8 PE |
2425 | if (slab_is_available()) |
2426 | gfp = GFP_KERNEL; | |
2427 | else | |
2428 | gfp = GFP_NOWAIT; | |
2429 | ||
3c583465 | 2430 | setup_nodelists_pointer(cachep); |
1da177e4 | 2431 | #if DEBUG |
1da177e4 | 2432 | |
ca5f9703 PE |
2433 | /* |
2434 | * Both debugging options require word-alignment which is calculated | |
2435 | * into align above. | |
2436 | */ | |
1da177e4 | 2437 | if (flags & SLAB_RED_ZONE) { |
1da177e4 | 2438 | /* add space for red zone words */ |
3ff84a7f PE |
2439 | cachep->obj_offset += sizeof(unsigned long long); |
2440 | size += 2 * sizeof(unsigned long long); | |
1da177e4 LT |
2441 | } |
2442 | if (flags & SLAB_STORE_USER) { | |
ca5f9703 | 2443 | /* user store requires one word storage behind the end of |
87a927c7 DW |
2444 | * the real object. But if the second red zone needs to be |
2445 | * aligned to 64 bits, we must allow that much space. | |
1da177e4 | 2446 | */ |
87a927c7 DW |
2447 | if (flags & SLAB_RED_ZONE) |
2448 | size += REDZONE_ALIGN; | |
2449 | else | |
2450 | size += BYTES_PER_WORD; | |
1da177e4 LT |
2451 | } |
2452 | #if FORCED_DEBUG && defined(CONFIG_DEBUG_PAGEALLOC) | |
b28a02de | 2453 | if (size >= malloc_sizes[INDEX_L3 + 1].cs_size |
608da7e3 TH |
2454 | && cachep->object_size > cache_line_size() |
2455 | && ALIGN(size, cachep->align) < PAGE_SIZE) { | |
2456 | cachep->obj_offset += PAGE_SIZE - ALIGN(size, cachep->align); | |
1da177e4 LT |
2457 | size = PAGE_SIZE; |
2458 | } | |
2459 | #endif | |
2460 | #endif | |
2461 | ||
e0a42726 IM |
2462 | /* |
2463 | * Determine if the slab management is 'on' or 'off' slab. | |
2464 | * (bootstrapping cannot cope with offslab caches so don't do | |
e7cb55b9 CM |
2465 | * it too early on. Always use on-slab management when |
2466 | * SLAB_NOLEAKTRACE to avoid recursive calls into kmemleak) | |
e0a42726 | 2467 | */ |
e7cb55b9 CM |
2468 | if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init && |
2469 | !(flags & SLAB_NOLEAKTRACE)) | |
1da177e4 LT |
2470 | /* |
2471 | * Size is large, assume best to place the slab management obj | |
2472 | * off-slab (should allow better packing of objs). | |
2473 | */ | |
2474 | flags |= CFLGS_OFF_SLAB; | |
2475 | ||
8a13a4cc | 2476 | size = ALIGN(size, cachep->align); |
1da177e4 | 2477 | |
8a13a4cc | 2478 | left_over = calculate_slab_order(cachep, size, cachep->align, flags); |
1da177e4 | 2479 | |
8a13a4cc | 2480 | if (!cachep->num) |
278b1bb1 | 2481 | return -E2BIG; |
1da177e4 | 2482 | |
b28a02de | 2483 | slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) |
8a13a4cc | 2484 | + sizeof(struct slab), cachep->align); |
1da177e4 LT |
2485 | |
2486 | /* | |
2487 | * If the slab has been placed off-slab, and we have enough space then | |
2488 | * move it on-slab. This is at the expense of any extra colouring. | |
2489 | */ | |
2490 | if (flags & CFLGS_OFF_SLAB && left_over >= slab_size) { | |
2491 | flags &= ~CFLGS_OFF_SLAB; | |
2492 | left_over -= slab_size; | |
2493 | } | |
2494 | ||
2495 | if (flags & CFLGS_OFF_SLAB) { | |
2496 | /* really off slab. No need for manual alignment */ | |
b28a02de PE |
2497 | slab_size = |
2498 | cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab); | |
67461365 RL |
2499 | |
2500 | #ifdef CONFIG_PAGE_POISONING | |
2501 | /* If we're going to use the generic kernel_map_pages() | |
2502 | * poisoning, then it's going to smash the contents of | |
2503 | * the redzone and userword anyhow, so switch them off. | |
2504 | */ | |
2505 | if (size % PAGE_SIZE == 0 && flags & SLAB_POISON) | |
2506 | flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); | |
2507 | #endif | |
1da177e4 LT |
2508 | } |
2509 | ||
2510 | cachep->colour_off = cache_line_size(); | |
2511 | /* Offset must be a multiple of the alignment. */ | |
8a13a4cc CL |
2512 | if (cachep->colour_off < cachep->align) |
2513 | cachep->colour_off = cachep->align; | |
b28a02de | 2514 | cachep->colour = left_over / cachep->colour_off; |
1da177e4 LT |
2515 | cachep->slab_size = slab_size; |
2516 | cachep->flags = flags; | |
a618e89f | 2517 | cachep->allocflags = 0; |
4b51d669 | 2518 | if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA)) |
a618e89f | 2519 | cachep->allocflags |= GFP_DMA; |
3b0efdfa | 2520 | cachep->size = size; |
6a2d7a95 | 2521 | cachep->reciprocal_buffer_size = reciprocal_value(size); |
1da177e4 | 2522 | |
e5ac9c5a | 2523 | if (flags & CFLGS_OFF_SLAB) { |
b2d55073 | 2524 | cachep->slabp_cache = kmem_find_general_cachep(slab_size, 0u); |
e5ac9c5a RT |
2525 | /* |
2526 | * This is a possibility for one of the malloc_sizes caches. | |
2527 | * But since we go off slab only for object size greater than | |
2528 | * PAGE_SIZE/8, and malloc_sizes gets created in ascending order, | |
2529 | * this should not happen at all. | |
2530 | * But leave a BUG_ON for some lucky dude. | |
2531 | */ | |
6cb8f913 | 2532 | BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache)); |
e5ac9c5a | 2533 | } |
1da177e4 | 2534 | |
278b1bb1 CL |
2535 | err = setup_cpu_cache(cachep, gfp); |
2536 | if (err) { | |
12c3667f | 2537 | __kmem_cache_shutdown(cachep); |
278b1bb1 | 2538 | return err; |
2ed3a4ef | 2539 | } |
1da177e4 | 2540 | |
83835b3d PZ |
2541 | if (flags & SLAB_DEBUG_OBJECTS) { |
2542 | /* | |
2543 | * Would deadlock through slab_destroy()->call_rcu()-> | |
2544 | * debug_object_activate()->kmem_cache_alloc(). | |
2545 | */ | |
2546 | WARN_ON_ONCE(flags & SLAB_DESTROY_BY_RCU); | |
2547 | ||
2548 | slab_set_debugobj_lock_classes(cachep); | |
2549 | } | |
2550 | ||
278b1bb1 | 2551 | return 0; |
1da177e4 | 2552 | } |
1da177e4 LT |
2553 | |
2554 | #if DEBUG | |
2555 | static void check_irq_off(void) | |
2556 | { | |
2557 | BUG_ON(!irqs_disabled()); | |
2558 | } | |
2559 | ||
2560 | static void check_irq_on(void) | |
2561 | { | |
2562 | BUG_ON(irqs_disabled()); | |
2563 | } | |
2564 | ||
343e0d7a | 2565 | static void check_spinlock_acquired(struct kmem_cache *cachep) |
1da177e4 LT |
2566 | { |
2567 | #ifdef CONFIG_SMP | |
2568 | check_irq_off(); | |
7d6e6d09 | 2569 | assert_spin_locked(&cachep->nodelists[numa_mem_id()]->list_lock); |
1da177e4 LT |
2570 | #endif |
2571 | } | |
e498be7d | 2572 | |
343e0d7a | 2573 | static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node) |
e498be7d CL |
2574 | { |
2575 | #ifdef CONFIG_SMP | |
2576 | check_irq_off(); | |
2577 | assert_spin_locked(&cachep->nodelists[node]->list_lock); | |
2578 | #endif | |
2579 | } | |
2580 | ||
1da177e4 LT |
2581 | #else |
2582 | #define check_irq_off() do { } while(0) | |
2583 | #define check_irq_on() do { } while(0) | |
2584 | #define check_spinlock_acquired(x) do { } while(0) | |
e498be7d | 2585 | #define check_spinlock_acquired_node(x, y) do { } while(0) |
1da177e4 LT |
2586 | #endif |
2587 | ||
aab2207c CL |
2588 | static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, |
2589 | struct array_cache *ac, | |
2590 | int force, int node); | |
2591 | ||
1da177e4 LT |
2592 | static void do_drain(void *arg) |
2593 | { | |
a737b3e2 | 2594 | struct kmem_cache *cachep = arg; |
1da177e4 | 2595 | struct array_cache *ac; |
7d6e6d09 | 2596 | int node = numa_mem_id(); |
1da177e4 LT |
2597 | |
2598 | check_irq_off(); | |
9a2dba4b | 2599 | ac = cpu_cache_get(cachep); |
ff69416e CL |
2600 | spin_lock(&cachep->nodelists[node]->list_lock); |
2601 | free_block(cachep, ac->entry, ac->avail, node); | |
2602 | spin_unlock(&cachep->nodelists[node]->list_lock); | |
1da177e4 LT |
2603 | ac->avail = 0; |
2604 | } | |
2605 | ||
343e0d7a | 2606 | static void drain_cpu_caches(struct kmem_cache *cachep) |
1da177e4 | 2607 | { |
e498be7d CL |
2608 | struct kmem_list3 *l3; |
2609 | int node; | |
2610 | ||
15c8b6c1 | 2611 | on_each_cpu(do_drain, cachep, 1); |
1da177e4 | 2612 | check_irq_on(); |
b28a02de | 2613 | for_each_online_node(node) { |
e498be7d | 2614 | l3 = cachep->nodelists[node]; |
a4523a8b RD |
2615 | if (l3 && l3->alien) |
2616 | drain_alien_cache(cachep, l3->alien); | |
2617 | } | |
2618 | ||
2619 | for_each_online_node(node) { | |
2620 | l3 = cachep->nodelists[node]; | |
2621 | if (l3) | |
aab2207c | 2622 | drain_array(cachep, l3, l3->shared, 1, node); |
e498be7d | 2623 | } |
1da177e4 LT |
2624 | } |
2625 | ||
ed11d9eb CL |
2626 | /* |
2627 | * Remove slabs from the list of free slabs. | |
2628 | * Specify the number of slabs to drain in tofree. | |
2629 | * | |
2630 | * Returns the actual number of slabs released. | |
2631 | */ | |
2632 | static int drain_freelist(struct kmem_cache *cache, | |
2633 | struct kmem_list3 *l3, int tofree) | |
1da177e4 | 2634 | { |
ed11d9eb CL |
2635 | struct list_head *p; |
2636 | int nr_freed; | |
1da177e4 | 2637 | struct slab *slabp; |
1da177e4 | 2638 | |
ed11d9eb CL |
2639 | nr_freed = 0; |
2640 | while (nr_freed < tofree && !list_empty(&l3->slabs_free)) { | |
1da177e4 | 2641 | |
ed11d9eb | 2642 | spin_lock_irq(&l3->list_lock); |
e498be7d | 2643 | p = l3->slabs_free.prev; |
ed11d9eb CL |
2644 | if (p == &l3->slabs_free) { |
2645 | spin_unlock_irq(&l3->list_lock); | |
2646 | goto out; | |
2647 | } | |
1da177e4 | 2648 | |
ed11d9eb | 2649 | slabp = list_entry(p, struct slab, list); |
1da177e4 | 2650 | #if DEBUG |
40094fa6 | 2651 | BUG_ON(slabp->inuse); |
1da177e4 LT |
2652 | #endif |
2653 | list_del(&slabp->list); | |
ed11d9eb CL |
2654 | /* |
2655 | * Safe to drop the lock. The slab is no longer linked | |
2656 | * to the cache. | |
2657 | */ | |
2658 | l3->free_objects -= cache->num; | |
e498be7d | 2659 | spin_unlock_irq(&l3->list_lock); |
ed11d9eb CL |
2660 | slab_destroy(cache, slabp); |
2661 | nr_freed++; | |
1da177e4 | 2662 | } |
ed11d9eb CL |
2663 | out: |
2664 | return nr_freed; | |
1da177e4 LT |
2665 | } |
2666 | ||
18004c5d | 2667 | /* Called with slab_mutex held to protect against cpu hotplug */ |
343e0d7a | 2668 | static int __cache_shrink(struct kmem_cache *cachep) |
e498be7d CL |
2669 | { |
2670 | int ret = 0, i = 0; | |
2671 | struct kmem_list3 *l3; | |
2672 | ||
2673 | drain_cpu_caches(cachep); | |
2674 | ||
2675 | check_irq_on(); | |
2676 | for_each_online_node(i) { | |
2677 | l3 = cachep->nodelists[i]; | |
ed11d9eb CL |
2678 | if (!l3) |
2679 | continue; | |
2680 | ||
2681 | drain_freelist(cachep, l3, l3->free_objects); | |
2682 | ||
2683 | ret += !list_empty(&l3->slabs_full) || | |
2684 | !list_empty(&l3->slabs_partial); | |
e498be7d CL |
2685 | } |
2686 | return (ret ? 1 : 0); | |
2687 | } | |
2688 | ||
1da177e4 LT |
2689 | /** |
2690 | * kmem_cache_shrink - Shrink a cache. | |
2691 | * @cachep: The cache to shrink. | |
2692 | * | |
2693 | * Releases as many slabs as possible for a cache. | |
2694 | * To help debugging, a zero exit status indicates all slabs were released. | |
2695 | */ | |
343e0d7a | 2696 | int kmem_cache_shrink(struct kmem_cache *cachep) |
1da177e4 | 2697 | { |
8f5be20b | 2698 | int ret; |
40094fa6 | 2699 | BUG_ON(!cachep || in_interrupt()); |
1da177e4 | 2700 | |
95402b38 | 2701 | get_online_cpus(); |
18004c5d | 2702 | mutex_lock(&slab_mutex); |
8f5be20b | 2703 | ret = __cache_shrink(cachep); |
18004c5d | 2704 | mutex_unlock(&slab_mutex); |
95402b38 | 2705 | put_online_cpus(); |
8f5be20b | 2706 | return ret; |
1da177e4 LT |
2707 | } |
2708 | EXPORT_SYMBOL(kmem_cache_shrink); | |
2709 | ||
945cf2b6 | 2710 | int __kmem_cache_shutdown(struct kmem_cache *cachep) |
1da177e4 | 2711 | { |
12c3667f CL |
2712 | int i; |
2713 | struct kmem_list3 *l3; | |
2714 | int rc = __cache_shrink(cachep); | |
1da177e4 | 2715 | |
12c3667f CL |
2716 | if (rc) |
2717 | return rc; | |
1da177e4 | 2718 | |
12c3667f CL |
2719 | for_each_online_cpu(i) |
2720 | kfree(cachep->array[i]); | |
1da177e4 | 2721 | |
12c3667f CL |
2722 | /* NUMA: free the list3 structures */ |
2723 | for_each_online_node(i) { | |
2724 | l3 = cachep->nodelists[i]; | |
2725 | if (l3) { | |
2726 | kfree(l3->shared); | |
2727 | free_alien_cache(l3->alien); | |
2728 | kfree(l3); | |
2729 | } | |
2730 | } | |
2731 | return 0; | |
1da177e4 | 2732 | } |
1da177e4 | 2733 | |
e5ac9c5a RT |
2734 | /* |
2735 | * Get the memory for a slab management obj. | |
2736 | * For a slab cache when the slab descriptor is off-slab, slab descriptors | |
2737 | * always come from malloc_sizes caches. The slab descriptor cannot | |
2738 | * come from the same cache which is getting created because, | |
2739 | * when we are searching for an appropriate cache for these | |
2740 | * descriptors in kmem_cache_create, we search through the malloc_sizes array. | |
2741 | * If we are creating a malloc_sizes cache here it would not be visible to | |
2742 | * kmem_find_general_cachep till the initialization is complete. | |
2743 | * Hence we cannot have slabp_cache same as the original cache. | |
2744 | */ | |
343e0d7a | 2745 | static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp, |
5b74ada7 RT |
2746 | int colour_off, gfp_t local_flags, |
2747 | int nodeid) | |
1da177e4 LT |
2748 | { |
2749 | struct slab *slabp; | |
b28a02de | 2750 | |
1da177e4 LT |
2751 | if (OFF_SLAB(cachep)) { |
2752 | /* Slab management obj is off-slab. */ | |
5b74ada7 | 2753 | slabp = kmem_cache_alloc_node(cachep->slabp_cache, |
8759ec50 | 2754 | local_flags, nodeid); |
d5cff635 CM |
2755 | /* |
2756 | * If the first object in the slab is leaked (it's allocated | |
2757 | * but no one has a reference to it), we want to make sure | |
2758 | * kmemleak does not treat the ->s_mem pointer as a reference | |
2759 | * to the object. Otherwise we will not report the leak. | |
2760 | */ | |
c017b4be CM |
2761 | kmemleak_scan_area(&slabp->list, sizeof(struct list_head), |
2762 | local_flags); | |
1da177e4 LT |
2763 | if (!slabp) |
2764 | return NULL; | |
2765 | } else { | |
b28a02de | 2766 | slabp = objp + colour_off; |
1da177e4 LT |
2767 | colour_off += cachep->slab_size; |
2768 | } | |
2769 | slabp->inuse = 0; | |
2770 | slabp->colouroff = colour_off; | |
b28a02de | 2771 | slabp->s_mem = objp + colour_off; |
5b74ada7 | 2772 | slabp->nodeid = nodeid; |
e51bfd0a | 2773 | slabp->free = 0; |
1da177e4 LT |
2774 | return slabp; |
2775 | } | |
2776 | ||
2777 | static inline kmem_bufctl_t *slab_bufctl(struct slab *slabp) | |
2778 | { | |
b28a02de | 2779 | return (kmem_bufctl_t *) (slabp + 1); |
1da177e4 LT |
2780 | } |
2781 | ||
343e0d7a | 2782 | static void cache_init_objs(struct kmem_cache *cachep, |
a35afb83 | 2783 | struct slab *slabp) |
1da177e4 LT |
2784 | { |
2785 | int i; | |
2786 | ||
2787 | for (i = 0; i < cachep->num; i++) { | |
8fea4e96 | 2788 | void *objp = index_to_obj(cachep, slabp, i); |
1da177e4 LT |
2789 | #if DEBUG |
2790 | /* need to poison the objs? */ | |
2791 | if (cachep->flags & SLAB_POISON) | |
2792 | poison_obj(cachep, objp, POISON_FREE); | |
2793 | if (cachep->flags & SLAB_STORE_USER) | |
2794 | *dbg_userword(cachep, objp) = NULL; | |
2795 | ||
2796 | if (cachep->flags & SLAB_RED_ZONE) { | |
2797 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; | |
2798 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
2799 | } | |
2800 | /* | |
a737b3e2 AM |
2801 | * Constructors are not allowed to allocate memory from the same |
2802 | * cache which they are a constructor for. Otherwise, deadlock. | |
2803 | * They must also be threaded. | |
1da177e4 LT |
2804 | */ |
2805 | if (cachep->ctor && !(cachep->flags & SLAB_POISON)) | |
51cc5068 | 2806 | cachep->ctor(objp + obj_offset(cachep)); |
1da177e4 LT |
2807 | |
2808 | if (cachep->flags & SLAB_RED_ZONE) { | |
2809 | if (*dbg_redzone2(cachep, objp) != RED_INACTIVE) | |
2810 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2811 | " end of an object"); |
1da177e4 LT |
2812 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE) |
2813 | slab_error(cachep, "constructor overwrote the" | |
b28a02de | 2814 | " start of an object"); |
1da177e4 | 2815 | } |
3b0efdfa | 2816 | if ((cachep->size % PAGE_SIZE) == 0 && |
a737b3e2 | 2817 | OFF_SLAB(cachep) && cachep->flags & SLAB_POISON) |
b28a02de | 2818 | kernel_map_pages(virt_to_page(objp), |
3b0efdfa | 2819 | cachep->size / PAGE_SIZE, 0); |
1da177e4 LT |
2820 | #else |
2821 | if (cachep->ctor) | |
51cc5068 | 2822 | cachep->ctor(objp); |
1da177e4 | 2823 | #endif |
b28a02de | 2824 | slab_bufctl(slabp)[i] = i + 1; |
1da177e4 | 2825 | } |
b28a02de | 2826 | slab_bufctl(slabp)[i - 1] = BUFCTL_END; |
1da177e4 LT |
2827 | } |
2828 | ||
343e0d7a | 2829 | static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 2830 | { |
4b51d669 CL |
2831 | if (CONFIG_ZONE_DMA_FLAG) { |
2832 | if (flags & GFP_DMA) | |
a618e89f | 2833 | BUG_ON(!(cachep->allocflags & GFP_DMA)); |
4b51d669 | 2834 | else |
a618e89f | 2835 | BUG_ON(cachep->allocflags & GFP_DMA); |
4b51d669 | 2836 | } |
1da177e4 LT |
2837 | } |
2838 | ||
a737b3e2 AM |
2839 | static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, |
2840 | int nodeid) | |
78d382d7 | 2841 | { |
8fea4e96 | 2842 | void *objp = index_to_obj(cachep, slabp, slabp->free); |
78d382d7 MD |
2843 | kmem_bufctl_t next; |
2844 | ||
2845 | slabp->inuse++; | |
2846 | next = slab_bufctl(slabp)[slabp->free]; | |
2847 | #if DEBUG | |
2848 | slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE; | |
2849 | WARN_ON(slabp->nodeid != nodeid); | |
2850 | #endif | |
2851 | slabp->free = next; | |
2852 | ||
2853 | return objp; | |
2854 | } | |
2855 | ||
a737b3e2 AM |
2856 | static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, |
2857 | void *objp, int nodeid) | |
78d382d7 | 2858 | { |
8fea4e96 | 2859 | unsigned int objnr = obj_to_index(cachep, slabp, objp); |
78d382d7 MD |
2860 | |
2861 | #if DEBUG | |
2862 | /* Verify that the slab belongs to the intended node */ | |
2863 | WARN_ON(slabp->nodeid != nodeid); | |
2864 | ||
871751e2 | 2865 | if (slab_bufctl(slabp)[objnr] + 1 <= SLAB_LIMIT + 1) { |
78d382d7 | 2866 | printk(KERN_ERR "slab: double free detected in cache " |
a737b3e2 | 2867 | "'%s', objp %p\n", cachep->name, objp); |
78d382d7 MD |
2868 | BUG(); |
2869 | } | |
2870 | #endif | |
2871 | slab_bufctl(slabp)[objnr] = slabp->free; | |
2872 | slabp->free = objnr; | |
2873 | slabp->inuse--; | |
2874 | } | |
2875 | ||
4776874f PE |
2876 | /* |
2877 | * Map pages beginning at addr to the given cache and slab. This is required | |
2878 | * for the slab allocator to be able to lookup the cache and slab of a | |
ccd35fb9 | 2879 | * virtual address for kfree, ksize, and slab debugging. |
4776874f PE |
2880 | */ |
2881 | static void slab_map_pages(struct kmem_cache *cache, struct slab *slab, | |
2882 | void *addr) | |
1da177e4 | 2883 | { |
4776874f | 2884 | int nr_pages; |
1da177e4 LT |
2885 | struct page *page; |
2886 | ||
4776874f | 2887 | page = virt_to_page(addr); |
84097518 | 2888 | |
4776874f | 2889 | nr_pages = 1; |
84097518 | 2890 | if (likely(!PageCompound(page))) |
4776874f PE |
2891 | nr_pages <<= cache->gfporder; |
2892 | ||
1da177e4 | 2893 | do { |
35026088 CL |
2894 | page->slab_cache = cache; |
2895 | page->slab_page = slab; | |
1da177e4 | 2896 | page++; |
4776874f | 2897 | } while (--nr_pages); |
1da177e4 LT |
2898 | } |
2899 | ||
2900 | /* | |
2901 | * Grow (by 1) the number of slabs within a cache. This is called by | |
2902 | * kmem_cache_alloc() when there are no active objs left in a cache. | |
2903 | */ | |
3c517a61 CL |
2904 | static int cache_grow(struct kmem_cache *cachep, |
2905 | gfp_t flags, int nodeid, void *objp) | |
1da177e4 | 2906 | { |
b28a02de | 2907 | struct slab *slabp; |
b28a02de PE |
2908 | size_t offset; |
2909 | gfp_t local_flags; | |
e498be7d | 2910 | struct kmem_list3 *l3; |
1da177e4 | 2911 | |
a737b3e2 AM |
2912 | /* |
2913 | * Be lazy and only check for valid flags here, keeping it out of the | |
2914 | * critical path in kmem_cache_alloc(). | |
1da177e4 | 2915 | */ |
6cb06229 CL |
2916 | BUG_ON(flags & GFP_SLAB_BUG_MASK); |
2917 | local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK); | |
1da177e4 | 2918 | |
2e1217cf | 2919 | /* Take the l3 list lock to change the colour_next on this node */ |
1da177e4 | 2920 | check_irq_off(); |
2e1217cf RT |
2921 | l3 = cachep->nodelists[nodeid]; |
2922 | spin_lock(&l3->list_lock); | |
1da177e4 LT |
2923 | |
2924 | /* Get colour for the slab, and cal the next value. */ | |
2e1217cf RT |
2925 | offset = l3->colour_next; |
2926 | l3->colour_next++; | |
2927 | if (l3->colour_next >= cachep->colour) | |
2928 | l3->colour_next = 0; | |
2929 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2930 | |
2e1217cf | 2931 | offset *= cachep->colour_off; |
1da177e4 LT |
2932 | |
2933 | if (local_flags & __GFP_WAIT) | |
2934 | local_irq_enable(); | |
2935 | ||
2936 | /* | |
2937 | * The test for missing atomic flag is performed here, rather than | |
2938 | * the more obvious place, simply to reduce the critical path length | |
2939 | * in kmem_cache_alloc(). If a caller is seriously mis-behaving they | |
2940 | * will eventually be caught here (where it matters). | |
2941 | */ | |
2942 | kmem_flagcheck(cachep, flags); | |
2943 | ||
a737b3e2 AM |
2944 | /* |
2945 | * Get mem for the objs. Attempt to allocate a physical page from | |
2946 | * 'nodeid'. | |
e498be7d | 2947 | */ |
3c517a61 | 2948 | if (!objp) |
b8c1c5da | 2949 | objp = kmem_getpages(cachep, local_flags, nodeid); |
a737b3e2 | 2950 | if (!objp) |
1da177e4 LT |
2951 | goto failed; |
2952 | ||
2953 | /* Get slab management. */ | |
3c517a61 | 2954 | slabp = alloc_slabmgmt(cachep, objp, offset, |
6cb06229 | 2955 | local_flags & ~GFP_CONSTRAINT_MASK, nodeid); |
a737b3e2 | 2956 | if (!slabp) |
1da177e4 LT |
2957 | goto opps1; |
2958 | ||
4776874f | 2959 | slab_map_pages(cachep, slabp, objp); |
1da177e4 | 2960 | |
a35afb83 | 2961 | cache_init_objs(cachep, slabp); |
1da177e4 LT |
2962 | |
2963 | if (local_flags & __GFP_WAIT) | |
2964 | local_irq_disable(); | |
2965 | check_irq_off(); | |
e498be7d | 2966 | spin_lock(&l3->list_lock); |
1da177e4 LT |
2967 | |
2968 | /* Make slab active. */ | |
e498be7d | 2969 | list_add_tail(&slabp->list, &(l3->slabs_free)); |
1da177e4 | 2970 | STATS_INC_GROWN(cachep); |
e498be7d CL |
2971 | l3->free_objects += cachep->num; |
2972 | spin_unlock(&l3->list_lock); | |
1da177e4 | 2973 | return 1; |
a737b3e2 | 2974 | opps1: |
1da177e4 | 2975 | kmem_freepages(cachep, objp); |
a737b3e2 | 2976 | failed: |
1da177e4 LT |
2977 | if (local_flags & __GFP_WAIT) |
2978 | local_irq_disable(); | |
2979 | return 0; | |
2980 | } | |
2981 | ||
2982 | #if DEBUG | |
2983 | ||
2984 | /* | |
2985 | * Perform extra freeing checks: | |
2986 | * - detect bad pointers. | |
2987 | * - POISON/RED_ZONE checking | |
1da177e4 LT |
2988 | */ |
2989 | static void kfree_debugcheck(const void *objp) | |
2990 | { | |
1da177e4 LT |
2991 | if (!virt_addr_valid(objp)) { |
2992 | printk(KERN_ERR "kfree_debugcheck: out of range ptr %lxh.\n", | |
b28a02de PE |
2993 | (unsigned long)objp); |
2994 | BUG(); | |
1da177e4 | 2995 | } |
1da177e4 LT |
2996 | } |
2997 | ||
58ce1fd5 PE |
2998 | static inline void verify_redzone_free(struct kmem_cache *cache, void *obj) |
2999 | { | |
b46b8f19 | 3000 | unsigned long long redzone1, redzone2; |
58ce1fd5 PE |
3001 | |
3002 | redzone1 = *dbg_redzone1(cache, obj); | |
3003 | redzone2 = *dbg_redzone2(cache, obj); | |
3004 | ||
3005 | /* | |
3006 | * Redzone is ok. | |
3007 | */ | |
3008 | if (redzone1 == RED_ACTIVE && redzone2 == RED_ACTIVE) | |
3009 | return; | |
3010 | ||
3011 | if (redzone1 == RED_INACTIVE && redzone2 == RED_INACTIVE) | |
3012 | slab_error(cache, "double free detected"); | |
3013 | else | |
3014 | slab_error(cache, "memory outside object was overwritten"); | |
3015 | ||
b46b8f19 | 3016 | printk(KERN_ERR "%p: redzone 1:0x%llx, redzone 2:0x%llx.\n", |
58ce1fd5 PE |
3017 | obj, redzone1, redzone2); |
3018 | } | |
3019 | ||
343e0d7a | 3020 | static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, |
7c0cb9c6 | 3021 | unsigned long caller) |
1da177e4 LT |
3022 | { |
3023 | struct page *page; | |
3024 | unsigned int objnr; | |
3025 | struct slab *slabp; | |
3026 | ||
80cbd911 MW |
3027 | BUG_ON(virt_to_cache(objp) != cachep); |
3028 | ||
3dafccf2 | 3029 | objp -= obj_offset(cachep); |
1da177e4 | 3030 | kfree_debugcheck(objp); |
b49af68f | 3031 | page = virt_to_head_page(objp); |
1da177e4 | 3032 | |
35026088 | 3033 | slabp = page->slab_page; |
1da177e4 LT |
3034 | |
3035 | if (cachep->flags & SLAB_RED_ZONE) { | |
58ce1fd5 | 3036 | verify_redzone_free(cachep, objp); |
1da177e4 LT |
3037 | *dbg_redzone1(cachep, objp) = RED_INACTIVE; |
3038 | *dbg_redzone2(cachep, objp) = RED_INACTIVE; | |
3039 | } | |
3040 | if (cachep->flags & SLAB_STORE_USER) | |
7c0cb9c6 | 3041 | *dbg_userword(cachep, objp) = (void *)caller; |
1da177e4 | 3042 | |
8fea4e96 | 3043 | objnr = obj_to_index(cachep, slabp, objp); |
1da177e4 LT |
3044 | |
3045 | BUG_ON(objnr >= cachep->num); | |
8fea4e96 | 3046 | BUG_ON(objp != index_to_obj(cachep, slabp, objnr)); |
1da177e4 | 3047 | |
871751e2 AV |
3048 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
3049 | slab_bufctl(slabp)[objnr] = BUFCTL_FREE; | |
3050 | #endif | |
1da177e4 LT |
3051 | if (cachep->flags & SLAB_POISON) { |
3052 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
3b0efdfa | 3053 | if ((cachep->size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) { |
7c0cb9c6 | 3054 | store_stackinfo(cachep, objp, caller); |
b28a02de | 3055 | kernel_map_pages(virt_to_page(objp), |
3b0efdfa | 3056 | cachep->size / PAGE_SIZE, 0); |
1da177e4 LT |
3057 | } else { |
3058 | poison_obj(cachep, objp, POISON_FREE); | |
3059 | } | |
3060 | #else | |
3061 | poison_obj(cachep, objp, POISON_FREE); | |
3062 | #endif | |
3063 | } | |
3064 | return objp; | |
3065 | } | |
3066 | ||
343e0d7a | 3067 | static void check_slabp(struct kmem_cache *cachep, struct slab *slabp) |
1da177e4 LT |
3068 | { |
3069 | kmem_bufctl_t i; | |
3070 | int entries = 0; | |
b28a02de | 3071 | |
1da177e4 LT |
3072 | /* Check slab's freelist to see if this obj is there. */ |
3073 | for (i = slabp->free; i != BUFCTL_END; i = slab_bufctl(slabp)[i]) { | |
3074 | entries++; | |
3075 | if (entries > cachep->num || i >= cachep->num) | |
3076 | goto bad; | |
3077 | } | |
3078 | if (entries != cachep->num - slabp->inuse) { | |
a737b3e2 AM |
3079 | bad: |
3080 | printk(KERN_ERR "slab: Internal list corruption detected in " | |
face37f5 DJ |
3081 | "cache '%s'(%d), slabp %p(%d). Tainted(%s). Hexdump:\n", |
3082 | cachep->name, cachep->num, slabp, slabp->inuse, | |
3083 | print_tainted()); | |
fdde6abb SAS |
3084 | print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp, |
3085 | sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t), | |
3086 | 1); | |
1da177e4 LT |
3087 | BUG(); |
3088 | } | |
3089 | } | |
3090 | #else | |
3091 | #define kfree_debugcheck(x) do { } while(0) | |
3092 | #define cache_free_debugcheck(x,objp,z) (objp) | |
3093 | #define check_slabp(x,y) do { } while(0) | |
3094 | #endif | |
3095 | ||
072bb0aa MG |
3096 | static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags, |
3097 | bool force_refill) | |
1da177e4 LT |
3098 | { |
3099 | int batchcount; | |
3100 | struct kmem_list3 *l3; | |
3101 | struct array_cache *ac; | |
1ca4cb24 PE |
3102 | int node; |
3103 | ||
1da177e4 | 3104 | check_irq_off(); |
7d6e6d09 | 3105 | node = numa_mem_id(); |
072bb0aa MG |
3106 | if (unlikely(force_refill)) |
3107 | goto force_grow; | |
3108 | retry: | |
9a2dba4b | 3109 | ac = cpu_cache_get(cachep); |
1da177e4 LT |
3110 | batchcount = ac->batchcount; |
3111 | if (!ac->touched && batchcount > BATCHREFILL_LIMIT) { | |
a737b3e2 AM |
3112 | /* |
3113 | * If there was little recent activity on this cache, then | |
3114 | * perform only a partial refill. Otherwise we could generate | |
3115 | * refill bouncing. | |
1da177e4 LT |
3116 | */ |
3117 | batchcount = BATCHREFILL_LIMIT; | |
3118 | } | |
1ca4cb24 | 3119 | l3 = cachep->nodelists[node]; |
e498be7d CL |
3120 | |
3121 | BUG_ON(ac->avail > 0 || !l3); | |
3122 | spin_lock(&l3->list_lock); | |
1da177e4 | 3123 | |
3ded175a | 3124 | /* See if we can refill from the shared array */ |
44b57f1c NP |
3125 | if (l3->shared && transfer_objects(ac, l3->shared, batchcount)) { |
3126 | l3->shared->touched = 1; | |
3ded175a | 3127 | goto alloc_done; |
44b57f1c | 3128 | } |
3ded175a | 3129 | |
1da177e4 LT |
3130 | while (batchcount > 0) { |
3131 | struct list_head *entry; | |
3132 | struct slab *slabp; | |
3133 | /* Get slab alloc is to come from. */ | |
3134 | entry = l3->slabs_partial.next; | |
3135 | if (entry == &l3->slabs_partial) { | |
3136 | l3->free_touched = 1; | |
3137 | entry = l3->slabs_free.next; | |
3138 | if (entry == &l3->slabs_free) | |
3139 | goto must_grow; | |
3140 | } | |
3141 | ||
3142 | slabp = list_entry(entry, struct slab, list); | |
3143 | check_slabp(cachep, slabp); | |
3144 | check_spinlock_acquired(cachep); | |
714b8171 PE |
3145 | |
3146 | /* | |
3147 | * The slab was either on partial or free list so | |
3148 | * there must be at least one object available for | |
3149 | * allocation. | |
3150 | */ | |
249b9f33 | 3151 | BUG_ON(slabp->inuse >= cachep->num); |
714b8171 | 3152 | |
1da177e4 | 3153 | while (slabp->inuse < cachep->num && batchcount--) { |
1da177e4 LT |
3154 | STATS_INC_ALLOCED(cachep); |
3155 | STATS_INC_ACTIVE(cachep); | |
3156 | STATS_SET_HIGH(cachep); | |
3157 | ||
072bb0aa MG |
3158 | ac_put_obj(cachep, ac, slab_get_obj(cachep, slabp, |
3159 | node)); | |
1da177e4 LT |
3160 | } |
3161 | check_slabp(cachep, slabp); | |
3162 | ||
3163 | /* move slabp to correct slabp list: */ | |
3164 | list_del(&slabp->list); | |
3165 | if (slabp->free == BUFCTL_END) | |
3166 | list_add(&slabp->list, &l3->slabs_full); | |
3167 | else | |
3168 | list_add(&slabp->list, &l3->slabs_partial); | |
3169 | } | |
3170 | ||
a737b3e2 | 3171 | must_grow: |
1da177e4 | 3172 | l3->free_objects -= ac->avail; |
a737b3e2 | 3173 | alloc_done: |
e498be7d | 3174 | spin_unlock(&l3->list_lock); |
1da177e4 LT |
3175 | |
3176 | if (unlikely(!ac->avail)) { | |
3177 | int x; | |
072bb0aa | 3178 | force_grow: |
3c517a61 | 3179 | x = cache_grow(cachep, flags | GFP_THISNODE, node, NULL); |
e498be7d | 3180 | |
a737b3e2 | 3181 | /* cache_grow can reenable interrupts, then ac could change. */ |
9a2dba4b | 3182 | ac = cpu_cache_get(cachep); |
51cd8e6f | 3183 | node = numa_mem_id(); |
072bb0aa MG |
3184 | |
3185 | /* no objects in sight? abort */ | |
3186 | if (!x && (ac->avail == 0 || force_refill)) | |
1da177e4 LT |
3187 | return NULL; |
3188 | ||
a737b3e2 | 3189 | if (!ac->avail) /* objects refilled by interrupt? */ |
1da177e4 LT |
3190 | goto retry; |
3191 | } | |
3192 | ac->touched = 1; | |
072bb0aa MG |
3193 | |
3194 | return ac_get_obj(cachep, ac, flags, force_refill); | |
1da177e4 LT |
3195 | } |
3196 | ||
a737b3e2 AM |
3197 | static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep, |
3198 | gfp_t flags) | |
1da177e4 LT |
3199 | { |
3200 | might_sleep_if(flags & __GFP_WAIT); | |
3201 | #if DEBUG | |
3202 | kmem_flagcheck(cachep, flags); | |
3203 | #endif | |
3204 | } | |
3205 | ||
3206 | #if DEBUG | |
a737b3e2 | 3207 | static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, |
7c0cb9c6 | 3208 | gfp_t flags, void *objp, unsigned long caller) |
1da177e4 | 3209 | { |
b28a02de | 3210 | if (!objp) |
1da177e4 | 3211 | return objp; |
b28a02de | 3212 | if (cachep->flags & SLAB_POISON) { |
1da177e4 | 3213 | #ifdef CONFIG_DEBUG_PAGEALLOC |
3b0efdfa | 3214 | if ((cachep->size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) |
b28a02de | 3215 | kernel_map_pages(virt_to_page(objp), |
3b0efdfa | 3216 | cachep->size / PAGE_SIZE, 1); |
1da177e4 LT |
3217 | else |
3218 | check_poison_obj(cachep, objp); | |
3219 | #else | |
3220 | check_poison_obj(cachep, objp); | |
3221 | #endif | |
3222 | poison_obj(cachep, objp, POISON_INUSE); | |
3223 | } | |
3224 | if (cachep->flags & SLAB_STORE_USER) | |
7c0cb9c6 | 3225 | *dbg_userword(cachep, objp) = (void *)caller; |
1da177e4 LT |
3226 | |
3227 | if (cachep->flags & SLAB_RED_ZONE) { | |
a737b3e2 AM |
3228 | if (*dbg_redzone1(cachep, objp) != RED_INACTIVE || |
3229 | *dbg_redzone2(cachep, objp) != RED_INACTIVE) { | |
3230 | slab_error(cachep, "double free, or memory outside" | |
3231 | " object was overwritten"); | |
b28a02de | 3232 | printk(KERN_ERR |
b46b8f19 | 3233 | "%p: redzone 1:0x%llx, redzone 2:0x%llx\n", |
a737b3e2 AM |
3234 | objp, *dbg_redzone1(cachep, objp), |
3235 | *dbg_redzone2(cachep, objp)); | |
1da177e4 LT |
3236 | } |
3237 | *dbg_redzone1(cachep, objp) = RED_ACTIVE; | |
3238 | *dbg_redzone2(cachep, objp) = RED_ACTIVE; | |
3239 | } | |
871751e2 AV |
3240 | #ifdef CONFIG_DEBUG_SLAB_LEAK |
3241 | { | |
3242 | struct slab *slabp; | |
3243 | unsigned objnr; | |
3244 | ||
35026088 | 3245 | slabp = virt_to_head_page(objp)->slab_page; |
3b0efdfa | 3246 | objnr = (unsigned)(objp - slabp->s_mem) / cachep->size; |
871751e2 AV |
3247 | slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE; |
3248 | } | |
3249 | #endif | |
3dafccf2 | 3250 | objp += obj_offset(cachep); |
4f104934 | 3251 | if (cachep->ctor && cachep->flags & SLAB_POISON) |
51cc5068 | 3252 | cachep->ctor(objp); |
7ea466f2 TH |
3253 | if (ARCH_SLAB_MINALIGN && |
3254 | ((unsigned long)objp & (ARCH_SLAB_MINALIGN-1))) { | |
a44b56d3 | 3255 | printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n", |
c225150b | 3256 | objp, (int)ARCH_SLAB_MINALIGN); |
a44b56d3 | 3257 | } |
1da177e4 LT |
3258 | return objp; |
3259 | } | |
3260 | #else | |
3261 | #define cache_alloc_debugcheck_after(a,b,objp,d) (objp) | |
3262 | #endif | |
3263 | ||
773ff60e | 3264 | static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags) |
8a8b6502 | 3265 | { |
9b030cb8 | 3266 | if (cachep == kmem_cache) |
773ff60e | 3267 | return false; |
8a8b6502 | 3268 | |
8c138bc0 | 3269 | return should_failslab(cachep->object_size, flags, cachep->flags); |
8a8b6502 AM |
3270 | } |
3271 | ||
343e0d7a | 3272 | static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 3273 | { |
b28a02de | 3274 | void *objp; |
1da177e4 | 3275 | struct array_cache *ac; |
072bb0aa | 3276 | bool force_refill = false; |
1da177e4 | 3277 | |
5c382300 | 3278 | check_irq_off(); |
8a8b6502 | 3279 | |
9a2dba4b | 3280 | ac = cpu_cache_get(cachep); |
1da177e4 | 3281 | if (likely(ac->avail)) { |
1da177e4 | 3282 | ac->touched = 1; |
072bb0aa MG |
3283 | objp = ac_get_obj(cachep, ac, flags, false); |
3284 | ||
ddbf2e83 | 3285 | /* |
072bb0aa MG |
3286 | * Allow for the possibility all avail objects are not allowed |
3287 | * by the current flags | |
ddbf2e83 | 3288 | */ |
072bb0aa MG |
3289 | if (objp) { |
3290 | STATS_INC_ALLOCHIT(cachep); | |
3291 | goto out; | |
3292 | } | |
3293 | force_refill = true; | |
1da177e4 | 3294 | } |
072bb0aa MG |
3295 | |
3296 | STATS_INC_ALLOCMISS(cachep); | |
3297 | objp = cache_alloc_refill(cachep, flags, force_refill); | |
3298 | /* | |
3299 | * the 'ac' may be updated by cache_alloc_refill(), | |
3300 | * and kmemleak_erase() requires its correct value. | |
3301 | */ | |
3302 | ac = cpu_cache_get(cachep); | |
3303 | ||
3304 | out: | |
d5cff635 CM |
3305 | /* |
3306 | * To avoid a false negative, if an object that is in one of the | |
3307 | * per-CPU caches is leaked, we need to make sure kmemleak doesn't | |
3308 | * treat the array pointers as a reference to the object. | |
3309 | */ | |
f3d8b53a O |
3310 | if (objp) |
3311 | kmemleak_erase(&ac->entry[ac->avail]); | |
5c382300 AK |
3312 | return objp; |
3313 | } | |
3314 | ||
e498be7d | 3315 | #ifdef CONFIG_NUMA |
c61afb18 | 3316 | /* |
b2455396 | 3317 | * Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY. |
c61afb18 PJ |
3318 | * |
3319 | * If we are in_interrupt, then process context, including cpusets and | |
3320 | * mempolicy, may not apply and should not be used for allocation policy. | |
3321 | */ | |
3322 | static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) | |
3323 | { | |
3324 | int nid_alloc, nid_here; | |
3325 | ||
765c4507 | 3326 | if (in_interrupt() || (flags & __GFP_THISNODE)) |
c61afb18 | 3327 | return NULL; |
7d6e6d09 | 3328 | nid_alloc = nid_here = numa_mem_id(); |
c61afb18 | 3329 | if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD)) |
6adef3eb | 3330 | nid_alloc = cpuset_slab_spread_node(); |
c61afb18 | 3331 | else if (current->mempolicy) |
e7b691b0 | 3332 | nid_alloc = slab_node(); |
c61afb18 | 3333 | if (nid_alloc != nid_here) |
8b98c169 | 3334 | return ____cache_alloc_node(cachep, flags, nid_alloc); |
c61afb18 PJ |
3335 | return NULL; |
3336 | } | |
3337 | ||
765c4507 CL |
3338 | /* |
3339 | * Fallback function if there was no memory available and no objects on a | |
3c517a61 CL |
3340 | * certain node and fall back is permitted. First we scan all the |
3341 | * available nodelists for available objects. If that fails then we | |
3342 | * perform an allocation without specifying a node. This allows the page | |
3343 | * allocator to do its reclaim / fallback magic. We then insert the | |
3344 | * slab into the proper nodelist and then allocate from it. | |
765c4507 | 3345 | */ |
8c8cc2c1 | 3346 | static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) |
765c4507 | 3347 | { |
8c8cc2c1 PE |
3348 | struct zonelist *zonelist; |
3349 | gfp_t local_flags; | |
dd1a239f | 3350 | struct zoneref *z; |
54a6eb5c MG |
3351 | struct zone *zone; |
3352 | enum zone_type high_zoneidx = gfp_zone(flags); | |
765c4507 | 3353 | void *obj = NULL; |
3c517a61 | 3354 | int nid; |
cc9a6c87 | 3355 | unsigned int cpuset_mems_cookie; |
8c8cc2c1 PE |
3356 | |
3357 | if (flags & __GFP_THISNODE) | |
3358 | return NULL; | |
3359 | ||
6cb06229 | 3360 | local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK); |
765c4507 | 3361 | |
cc9a6c87 MG |
3362 | retry_cpuset: |
3363 | cpuset_mems_cookie = get_mems_allowed(); | |
e7b691b0 | 3364 | zonelist = node_zonelist(slab_node(), flags); |
cc9a6c87 | 3365 | |
3c517a61 CL |
3366 | retry: |
3367 | /* | |
3368 | * Look through allowed nodes for objects available | |
3369 | * from existing per node queues. | |
3370 | */ | |
54a6eb5c MG |
3371 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
3372 | nid = zone_to_nid(zone); | |
aedb0eb1 | 3373 | |
54a6eb5c | 3374 | if (cpuset_zone_allowed_hardwall(zone, flags) && |
3c517a61 | 3375 | cache->nodelists[nid] && |
481c5346 | 3376 | cache->nodelists[nid]->free_objects) { |
3c517a61 CL |
3377 | obj = ____cache_alloc_node(cache, |
3378 | flags | GFP_THISNODE, nid); | |
481c5346 CL |
3379 | if (obj) |
3380 | break; | |
3381 | } | |
3c517a61 CL |
3382 | } |
3383 | ||
cfce6604 | 3384 | if (!obj) { |
3c517a61 CL |
3385 | /* |
3386 | * This allocation will be performed within the constraints | |
3387 | * of the current cpuset / memory policy requirements. | |
3388 | * We may trigger various forms of reclaim on the allowed | |
3389 | * set and go into memory reserves if necessary. | |
3390 | */ | |
dd47ea75 CL |
3391 | if (local_flags & __GFP_WAIT) |
3392 | local_irq_enable(); | |
3393 | kmem_flagcheck(cache, flags); | |
7d6e6d09 | 3394 | obj = kmem_getpages(cache, local_flags, numa_mem_id()); |
dd47ea75 CL |
3395 | if (local_flags & __GFP_WAIT) |
3396 | local_irq_disable(); | |
3c517a61 CL |
3397 | if (obj) { |
3398 | /* | |
3399 | * Insert into the appropriate per node queues | |
3400 | */ | |
3401 | nid = page_to_nid(virt_to_page(obj)); | |
3402 | if (cache_grow(cache, flags, nid, obj)) { | |
3403 | obj = ____cache_alloc_node(cache, | |
3404 | flags | GFP_THISNODE, nid); | |
3405 | if (!obj) | |
3406 | /* | |
3407 | * Another processor may allocate the | |
3408 | * objects in the slab since we are | |
3409 | * not holding any locks. | |
3410 | */ | |
3411 | goto retry; | |
3412 | } else { | |
b6a60451 | 3413 | /* cache_grow already freed obj */ |
3c517a61 CL |
3414 | obj = NULL; |
3415 | } | |
3416 | } | |
aedb0eb1 | 3417 | } |
cc9a6c87 MG |
3418 | |
3419 | if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !obj)) | |
3420 | goto retry_cpuset; | |
765c4507 CL |
3421 | return obj; |
3422 | } | |
3423 | ||
e498be7d CL |
3424 | /* |
3425 | * A interface to enable slab creation on nodeid | |
1da177e4 | 3426 | */ |
8b98c169 | 3427 | static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, |
a737b3e2 | 3428 | int nodeid) |
e498be7d CL |
3429 | { |
3430 | struct list_head *entry; | |
b28a02de PE |
3431 | struct slab *slabp; |
3432 | struct kmem_list3 *l3; | |
3433 | void *obj; | |
b28a02de PE |
3434 | int x; |
3435 | ||
3436 | l3 = cachep->nodelists[nodeid]; | |
3437 | BUG_ON(!l3); | |
3438 | ||
a737b3e2 | 3439 | retry: |
ca3b9b91 | 3440 | check_irq_off(); |
b28a02de PE |
3441 | spin_lock(&l3->list_lock); |
3442 | entry = l3->slabs_partial.next; | |
3443 | if (entry == &l3->slabs_partial) { | |
3444 | l3->free_touched = 1; | |
3445 | entry = l3->slabs_free.next; | |
3446 | if (entry == &l3->slabs_free) | |
3447 | goto must_grow; | |
3448 | } | |
3449 | ||
3450 | slabp = list_entry(entry, struct slab, list); | |
3451 | check_spinlock_acquired_node(cachep, nodeid); | |
3452 | check_slabp(cachep, slabp); | |
3453 | ||
3454 | STATS_INC_NODEALLOCS(cachep); | |
3455 | STATS_INC_ACTIVE(cachep); | |
3456 | STATS_SET_HIGH(cachep); | |
3457 | ||
3458 | BUG_ON(slabp->inuse == cachep->num); | |
3459 | ||
78d382d7 | 3460 | obj = slab_get_obj(cachep, slabp, nodeid); |
b28a02de PE |
3461 | check_slabp(cachep, slabp); |
3462 | l3->free_objects--; | |
3463 | /* move slabp to correct slabp list: */ | |
3464 | list_del(&slabp->list); | |
3465 | ||
a737b3e2 | 3466 | if (slabp->free == BUFCTL_END) |
b28a02de | 3467 | list_add(&slabp->list, &l3->slabs_full); |
a737b3e2 | 3468 | else |
b28a02de | 3469 | list_add(&slabp->list, &l3->slabs_partial); |
e498be7d | 3470 | |
b28a02de PE |
3471 | spin_unlock(&l3->list_lock); |
3472 | goto done; | |
e498be7d | 3473 | |
a737b3e2 | 3474 | must_grow: |
b28a02de | 3475 | spin_unlock(&l3->list_lock); |
3c517a61 | 3476 | x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL); |
765c4507 CL |
3477 | if (x) |
3478 | goto retry; | |
1da177e4 | 3479 | |
8c8cc2c1 | 3480 | return fallback_alloc(cachep, flags); |
e498be7d | 3481 | |
a737b3e2 | 3482 | done: |
b28a02de | 3483 | return obj; |
e498be7d | 3484 | } |
8c8cc2c1 PE |
3485 | |
3486 | /** | |
3487 | * kmem_cache_alloc_node - Allocate an object on the specified node | |
3488 | * @cachep: The cache to allocate from. | |
3489 | * @flags: See kmalloc(). | |
3490 | * @nodeid: node number of the target node. | |
3491 | * @caller: return address of caller, used for debug information | |
3492 | * | |
3493 | * Identical to kmem_cache_alloc but it will allocate memory on the given | |
3494 | * node, which can improve the performance for cpu bound structures. | |
3495 | * | |
3496 | * Fallback to other node is possible if __GFP_THISNODE is not set. | |
3497 | */ | |
3498 | static __always_inline void * | |
48356303 | 3499 | slab_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid, |
7c0cb9c6 | 3500 | unsigned long caller) |
8c8cc2c1 PE |
3501 | { |
3502 | unsigned long save_flags; | |
3503 | void *ptr; | |
7d6e6d09 | 3504 | int slab_node = numa_mem_id(); |
8c8cc2c1 | 3505 | |
dcce284a | 3506 | flags &= gfp_allowed_mask; |
7e85ee0c | 3507 | |
cf40bd16 NP |
3508 | lockdep_trace_alloc(flags); |
3509 | ||
773ff60e | 3510 | if (slab_should_failslab(cachep, flags)) |
824ebef1 AM |
3511 | return NULL; |
3512 | ||
8c8cc2c1 PE |
3513 | cache_alloc_debugcheck_before(cachep, flags); |
3514 | local_irq_save(save_flags); | |
3515 | ||
eacbbae3 | 3516 | if (nodeid == NUMA_NO_NODE) |
7d6e6d09 | 3517 | nodeid = slab_node; |
8c8cc2c1 PE |
3518 | |
3519 | if (unlikely(!cachep->nodelists[nodeid])) { | |
3520 | /* Node not bootstrapped yet */ | |
3521 | ptr = fallback_alloc(cachep, flags); | |
3522 | goto out; | |
3523 | } | |
3524 | ||
7d6e6d09 | 3525 | if (nodeid == slab_node) { |
8c8cc2c1 PE |
3526 | /* |
3527 | * Use the locally cached objects if possible. | |
3528 | * However ____cache_alloc does not allow fallback | |
3529 | * to other nodes. It may fail while we still have | |
3530 | * objects on other nodes available. | |
3531 | */ | |
3532 | ptr = ____cache_alloc(cachep, flags); | |
3533 | if (ptr) | |
3534 | goto out; | |
3535 | } | |
3536 | /* ___cache_alloc_node can fall back to other nodes */ | |
3537 | ptr = ____cache_alloc_node(cachep, flags, nodeid); | |
3538 | out: | |
3539 | local_irq_restore(save_flags); | |
3540 | ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller); | |
8c138bc0 | 3541 | kmemleak_alloc_recursive(ptr, cachep->object_size, 1, cachep->flags, |
d5cff635 | 3542 | flags); |
8c8cc2c1 | 3543 | |
c175eea4 | 3544 | if (likely(ptr)) |
8c138bc0 | 3545 | kmemcheck_slab_alloc(cachep, flags, ptr, cachep->object_size); |
c175eea4 | 3546 | |
d07dbea4 | 3547 | if (unlikely((flags & __GFP_ZERO) && ptr)) |
8c138bc0 | 3548 | memset(ptr, 0, cachep->object_size); |
d07dbea4 | 3549 | |
8c8cc2c1 PE |
3550 | return ptr; |
3551 | } | |
3552 | ||
3553 | static __always_inline void * | |
3554 | __do_cache_alloc(struct kmem_cache *cache, gfp_t flags) | |
3555 | { | |
3556 | void *objp; | |
3557 | ||
3558 | if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { | |
3559 | objp = alternate_node_alloc(cache, flags); | |
3560 | if (objp) | |
3561 | goto out; | |
3562 | } | |
3563 | objp = ____cache_alloc(cache, flags); | |
3564 | ||
3565 | /* | |
3566 | * We may just have run out of memory on the local node. | |
3567 | * ____cache_alloc_node() knows how to locate memory on other nodes | |
3568 | */ | |
7d6e6d09 LS |
3569 | if (!objp) |
3570 | objp = ____cache_alloc_node(cache, flags, numa_mem_id()); | |
8c8cc2c1 PE |
3571 | |
3572 | out: | |
3573 | return objp; | |
3574 | } | |
3575 | #else | |
3576 | ||
3577 | static __always_inline void * | |
3578 | __do_cache_alloc(struct kmem_cache *cachep, gfp_t flags) | |
3579 | { | |
3580 | return ____cache_alloc(cachep, flags); | |
3581 | } | |
3582 | ||
3583 | #endif /* CONFIG_NUMA */ | |
3584 | ||
3585 | static __always_inline void * | |
48356303 | 3586 | slab_alloc(struct kmem_cache *cachep, gfp_t flags, unsigned long caller) |
8c8cc2c1 PE |
3587 | { |
3588 | unsigned long save_flags; | |
3589 | void *objp; | |
3590 | ||
dcce284a | 3591 | flags &= gfp_allowed_mask; |
7e85ee0c | 3592 | |
cf40bd16 NP |
3593 | lockdep_trace_alloc(flags); |
3594 | ||
773ff60e | 3595 | if (slab_should_failslab(cachep, flags)) |
824ebef1 AM |
3596 | return NULL; |
3597 | ||
8c8cc2c1 PE |
3598 | cache_alloc_debugcheck_before(cachep, flags); |
3599 | local_irq_save(save_flags); | |
3600 | objp = __do_cache_alloc(cachep, flags); | |
3601 | local_irq_restore(save_flags); | |
3602 | objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); | |
8c138bc0 | 3603 | kmemleak_alloc_recursive(objp, cachep->object_size, 1, cachep->flags, |
d5cff635 | 3604 | flags); |
8c8cc2c1 PE |
3605 | prefetchw(objp); |
3606 | ||
c175eea4 | 3607 | if (likely(objp)) |
8c138bc0 | 3608 | kmemcheck_slab_alloc(cachep, flags, objp, cachep->object_size); |
c175eea4 | 3609 | |
d07dbea4 | 3610 | if (unlikely((flags & __GFP_ZERO) && objp)) |
8c138bc0 | 3611 | memset(objp, 0, cachep->object_size); |
d07dbea4 | 3612 | |
8c8cc2c1 PE |
3613 | return objp; |
3614 | } | |
e498be7d CL |
3615 | |
3616 | /* | |
3617 | * Caller needs to acquire correct kmem_list's list_lock | |
3618 | */ | |
343e0d7a | 3619 | static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, |
b28a02de | 3620 | int node) |
1da177e4 LT |
3621 | { |
3622 | int i; | |
e498be7d | 3623 | struct kmem_list3 *l3; |
1da177e4 LT |
3624 | |
3625 | for (i = 0; i < nr_objects; i++) { | |
072bb0aa | 3626 | void *objp; |
1da177e4 | 3627 | struct slab *slabp; |
1da177e4 | 3628 | |
072bb0aa MG |
3629 | clear_obj_pfmemalloc(&objpp[i]); |
3630 | objp = objpp[i]; | |
3631 | ||
6ed5eb22 | 3632 | slabp = virt_to_slab(objp); |
ff69416e | 3633 | l3 = cachep->nodelists[node]; |
1da177e4 | 3634 | list_del(&slabp->list); |
ff69416e | 3635 | check_spinlock_acquired_node(cachep, node); |
1da177e4 | 3636 | check_slabp(cachep, slabp); |
78d382d7 | 3637 | slab_put_obj(cachep, slabp, objp, node); |
1da177e4 | 3638 | STATS_DEC_ACTIVE(cachep); |
e498be7d | 3639 | l3->free_objects++; |
1da177e4 LT |
3640 | check_slabp(cachep, slabp); |
3641 | ||
3642 | /* fixup slab chains */ | |
3643 | if (slabp->inuse == 0) { | |
e498be7d CL |
3644 | if (l3->free_objects > l3->free_limit) { |
3645 | l3->free_objects -= cachep->num; | |
e5ac9c5a RT |
3646 | /* No need to drop any previously held |
3647 | * lock here, even if we have a off-slab slab | |
3648 | * descriptor it is guaranteed to come from | |
3649 | * a different cache, refer to comments before | |
3650 | * alloc_slabmgmt. | |
3651 | */ | |
1da177e4 LT |
3652 | slab_destroy(cachep, slabp); |
3653 | } else { | |
e498be7d | 3654 | list_add(&slabp->list, &l3->slabs_free); |
1da177e4 LT |
3655 | } |
3656 | } else { | |
3657 | /* Unconditionally move a slab to the end of the | |
3658 | * partial list on free - maximum time for the | |
3659 | * other objects to be freed, too. | |
3660 | */ | |
e498be7d | 3661 | list_add_tail(&slabp->list, &l3->slabs_partial); |
1da177e4 LT |
3662 | } |
3663 | } | |
3664 | } | |
3665 | ||
343e0d7a | 3666 | static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) |
1da177e4 LT |
3667 | { |
3668 | int batchcount; | |
e498be7d | 3669 | struct kmem_list3 *l3; |
7d6e6d09 | 3670 | int node = numa_mem_id(); |
1da177e4 LT |
3671 | |
3672 | batchcount = ac->batchcount; | |
3673 | #if DEBUG | |
3674 | BUG_ON(!batchcount || batchcount > ac->avail); | |
3675 | #endif | |
3676 | check_irq_off(); | |
ff69416e | 3677 | l3 = cachep->nodelists[node]; |
873623df | 3678 | spin_lock(&l3->list_lock); |
e498be7d CL |
3679 | if (l3->shared) { |
3680 | struct array_cache *shared_array = l3->shared; | |
b28a02de | 3681 | int max = shared_array->limit - shared_array->avail; |
1da177e4 LT |
3682 | if (max) { |
3683 | if (batchcount > max) | |
3684 | batchcount = max; | |
e498be7d | 3685 | memcpy(&(shared_array->entry[shared_array->avail]), |
b28a02de | 3686 | ac->entry, sizeof(void *) * batchcount); |
1da177e4 LT |
3687 | shared_array->avail += batchcount; |
3688 | goto free_done; | |
3689 | } | |
3690 | } | |
3691 | ||
ff69416e | 3692 | free_block(cachep, ac->entry, batchcount, node); |
a737b3e2 | 3693 | free_done: |
1da177e4 LT |
3694 | #if STATS |
3695 | { | |
3696 | int i = 0; | |
3697 | struct list_head *p; | |
3698 | ||
e498be7d CL |
3699 | p = l3->slabs_free.next; |
3700 | while (p != &(l3->slabs_free)) { | |
1da177e4 LT |
3701 | struct slab *slabp; |
3702 | ||
3703 | slabp = list_entry(p, struct slab, list); | |
3704 | BUG_ON(slabp->inuse); | |
3705 | ||
3706 | i++; | |
3707 | p = p->next; | |
3708 | } | |
3709 | STATS_SET_FREEABLE(cachep, i); | |
3710 | } | |
3711 | #endif | |
e498be7d | 3712 | spin_unlock(&l3->list_lock); |
1da177e4 | 3713 | ac->avail -= batchcount; |
a737b3e2 | 3714 | memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail); |
1da177e4 LT |
3715 | } |
3716 | ||
3717 | /* | |
a737b3e2 AM |
3718 | * Release an obj back to its cache. If the obj has a constructed state, it must |
3719 | * be in this state _before_ it is released. Called with disabled ints. | |
1da177e4 | 3720 | */ |
a947eb95 | 3721 | static inline void __cache_free(struct kmem_cache *cachep, void *objp, |
7c0cb9c6 | 3722 | unsigned long caller) |
1da177e4 | 3723 | { |
9a2dba4b | 3724 | struct array_cache *ac = cpu_cache_get(cachep); |
1da177e4 LT |
3725 | |
3726 | check_irq_off(); | |
d5cff635 | 3727 | kmemleak_free_recursive(objp, cachep->flags); |
a947eb95 | 3728 | objp = cache_free_debugcheck(cachep, objp, caller); |
1da177e4 | 3729 | |
8c138bc0 | 3730 | kmemcheck_slab_free(cachep, objp, cachep->object_size); |
c175eea4 | 3731 | |
1807a1aa SS |
3732 | /* |
3733 | * Skip calling cache_free_alien() when the platform is not numa. | |
3734 | * This will avoid cache misses that happen while accessing slabp (which | |
3735 | * is per page memory reference) to get nodeid. Instead use a global | |
3736 | * variable to skip the call, which is mostly likely to be present in | |
3737 | * the cache. | |
3738 | */ | |
b6e68bc1 | 3739 | if (nr_online_nodes > 1 && cache_free_alien(cachep, objp)) |
729bd0b7 PE |
3740 | return; |
3741 | ||
1da177e4 LT |
3742 | if (likely(ac->avail < ac->limit)) { |
3743 | STATS_INC_FREEHIT(cachep); | |
1da177e4 LT |
3744 | } else { |
3745 | STATS_INC_FREEMISS(cachep); | |
3746 | cache_flusharray(cachep, ac); | |
1da177e4 | 3747 | } |
42c8c99c | 3748 | |
072bb0aa | 3749 | ac_put_obj(cachep, ac, objp); |
1da177e4 LT |
3750 | } |
3751 | ||
3752 | /** | |
3753 | * kmem_cache_alloc - Allocate an object | |
3754 | * @cachep: The cache to allocate from. | |
3755 | * @flags: See kmalloc(). | |
3756 | * | |
3757 | * Allocate an object from this cache. The flags are only relevant | |
3758 | * if the cache has no available objects. | |
3759 | */ | |
343e0d7a | 3760 | void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
1da177e4 | 3761 | { |
48356303 | 3762 | void *ret = slab_alloc(cachep, flags, _RET_IP_); |
36555751 | 3763 | |
ca2b84cb | 3764 | trace_kmem_cache_alloc(_RET_IP_, ret, |
8c138bc0 | 3765 | cachep->object_size, cachep->size, flags); |
36555751 EGM |
3766 | |
3767 | return ret; | |
1da177e4 LT |
3768 | } |
3769 | EXPORT_SYMBOL(kmem_cache_alloc); | |
3770 | ||
0f24f128 | 3771 | #ifdef CONFIG_TRACING |
85beb586 | 3772 | void * |
4052147c | 3773 | kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size) |
36555751 | 3774 | { |
85beb586 SR |
3775 | void *ret; |
3776 | ||
48356303 | 3777 | ret = slab_alloc(cachep, flags, _RET_IP_); |
85beb586 SR |
3778 | |
3779 | trace_kmalloc(_RET_IP_, ret, | |
ff4fcd01 | 3780 | size, cachep->size, flags); |
85beb586 | 3781 | return ret; |
36555751 | 3782 | } |
85beb586 | 3783 | EXPORT_SYMBOL(kmem_cache_alloc_trace); |
36555751 EGM |
3784 | #endif |
3785 | ||
1da177e4 | 3786 | #ifdef CONFIG_NUMA |
8b98c169 CH |
3787 | void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) |
3788 | { | |
48356303 | 3789 | void *ret = slab_alloc_node(cachep, flags, nodeid, _RET_IP_); |
36555751 | 3790 | |
ca2b84cb | 3791 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
8c138bc0 | 3792 | cachep->object_size, cachep->size, |
ca2b84cb | 3793 | flags, nodeid); |
36555751 EGM |
3794 | |
3795 | return ret; | |
8b98c169 | 3796 | } |
1da177e4 LT |
3797 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
3798 | ||
0f24f128 | 3799 | #ifdef CONFIG_TRACING |
4052147c | 3800 | void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep, |
85beb586 | 3801 | gfp_t flags, |
4052147c EG |
3802 | int nodeid, |
3803 | size_t size) | |
36555751 | 3804 | { |
85beb586 SR |
3805 | void *ret; |
3806 | ||
592f4145 | 3807 | ret = slab_alloc_node(cachep, flags, nodeid, _RET_IP_); |
7c0cb9c6 | 3808 | |
85beb586 | 3809 | trace_kmalloc_node(_RET_IP_, ret, |
ff4fcd01 | 3810 | size, cachep->size, |
85beb586 SR |
3811 | flags, nodeid); |
3812 | return ret; | |
36555751 | 3813 | } |
85beb586 | 3814 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
36555751 EGM |
3815 | #endif |
3816 | ||
8b98c169 | 3817 | static __always_inline void * |
7c0cb9c6 | 3818 | __do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller) |
97e2bde4 | 3819 | { |
343e0d7a | 3820 | struct kmem_cache *cachep; |
97e2bde4 MS |
3821 | |
3822 | cachep = kmem_find_general_cachep(size, flags); | |
6cb8f913 CL |
3823 | if (unlikely(ZERO_OR_NULL_PTR(cachep))) |
3824 | return cachep; | |
4052147c | 3825 | return kmem_cache_alloc_node_trace(cachep, flags, node, size); |
97e2bde4 | 3826 | } |
8b98c169 | 3827 | |
0bb38a5c | 3828 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING) |
8b98c169 CH |
3829 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
3830 | { | |
7c0cb9c6 | 3831 | return __do_kmalloc_node(size, flags, node, _RET_IP_); |
8b98c169 | 3832 | } |
dbe5e69d | 3833 | EXPORT_SYMBOL(__kmalloc_node); |
8b98c169 CH |
3834 | |
3835 | void *__kmalloc_node_track_caller(size_t size, gfp_t flags, | |
ce71e27c | 3836 | int node, unsigned long caller) |
8b98c169 | 3837 | { |
7c0cb9c6 | 3838 | return __do_kmalloc_node(size, flags, node, caller); |
8b98c169 CH |
3839 | } |
3840 | EXPORT_SYMBOL(__kmalloc_node_track_caller); | |
3841 | #else | |
3842 | void *__kmalloc_node(size_t size, gfp_t flags, int node) | |
3843 | { | |
7c0cb9c6 | 3844 | return __do_kmalloc_node(size, flags, node, 0); |
8b98c169 CH |
3845 | } |
3846 | EXPORT_SYMBOL(__kmalloc_node); | |
0bb38a5c | 3847 | #endif /* CONFIG_DEBUG_SLAB || CONFIG_TRACING */ |
8b98c169 | 3848 | #endif /* CONFIG_NUMA */ |
1da177e4 LT |
3849 | |
3850 | /** | |
800590f5 | 3851 | * __do_kmalloc - allocate memory |
1da177e4 | 3852 | * @size: how many bytes of memory are required. |
800590f5 | 3853 | * @flags: the type of memory to allocate (see kmalloc). |
911851e6 | 3854 | * @caller: function caller for debug tracking of the caller |
1da177e4 | 3855 | */ |
7fd6b141 | 3856 | static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, |
7c0cb9c6 | 3857 | unsigned long caller) |
1da177e4 | 3858 | { |
343e0d7a | 3859 | struct kmem_cache *cachep; |
36555751 | 3860 | void *ret; |
1da177e4 | 3861 | |
97e2bde4 MS |
3862 | /* If you want to save a few bytes .text space: replace |
3863 | * __ with kmem_. | |
3864 | * Then kmalloc uses the uninlined functions instead of the inline | |
3865 | * functions. | |
3866 | */ | |
3867 | cachep = __find_general_cachep(size, flags); | |
a5c96d8a LT |
3868 | if (unlikely(ZERO_OR_NULL_PTR(cachep))) |
3869 | return cachep; | |
48356303 | 3870 | ret = slab_alloc(cachep, flags, caller); |
36555751 | 3871 | |
7c0cb9c6 | 3872 | trace_kmalloc(caller, ret, |
3b0efdfa | 3873 | size, cachep->size, flags); |
36555751 EGM |
3874 | |
3875 | return ret; | |
7fd6b141 PE |
3876 | } |
3877 | ||
7fd6b141 | 3878 | |
0bb38a5c | 3879 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING) |
7fd6b141 PE |
3880 | void *__kmalloc(size_t size, gfp_t flags) |
3881 | { | |
7c0cb9c6 | 3882 | return __do_kmalloc(size, flags, _RET_IP_); |
1da177e4 LT |
3883 | } |
3884 | EXPORT_SYMBOL(__kmalloc); | |
3885 | ||
ce71e27c | 3886 | void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller) |
7fd6b141 | 3887 | { |
7c0cb9c6 | 3888 | return __do_kmalloc(size, flags, caller); |
7fd6b141 PE |
3889 | } |
3890 | EXPORT_SYMBOL(__kmalloc_track_caller); | |
1d2c8eea CH |
3891 | |
3892 | #else | |
3893 | void *__kmalloc(size_t size, gfp_t flags) | |
3894 | { | |
7c0cb9c6 | 3895 | return __do_kmalloc(size, flags, 0); |
1d2c8eea CH |
3896 | } |
3897 | EXPORT_SYMBOL(__kmalloc); | |
7fd6b141 PE |
3898 | #endif |
3899 | ||
1da177e4 LT |
3900 | /** |
3901 | * kmem_cache_free - Deallocate an object | |
3902 | * @cachep: The cache the allocation was from. | |
3903 | * @objp: The previously allocated object. | |
3904 | * | |
3905 | * Free an object which was previously allocated from this | |
3906 | * cache. | |
3907 | */ | |
343e0d7a | 3908 | void kmem_cache_free(struct kmem_cache *cachep, void *objp) |
1da177e4 LT |
3909 | { |
3910 | unsigned long flags; | |
3911 | ||
3912 | local_irq_save(flags); | |
d97d476b | 3913 | debug_check_no_locks_freed(objp, cachep->object_size); |
3ac7fe5a | 3914 | if (!(cachep->flags & SLAB_DEBUG_OBJECTS)) |
8c138bc0 | 3915 | debug_check_no_obj_freed(objp, cachep->object_size); |
7c0cb9c6 | 3916 | __cache_free(cachep, objp, _RET_IP_); |
1da177e4 | 3917 | local_irq_restore(flags); |
36555751 | 3918 | |
ca2b84cb | 3919 | trace_kmem_cache_free(_RET_IP_, objp); |
1da177e4 LT |
3920 | } |
3921 | EXPORT_SYMBOL(kmem_cache_free); | |
3922 | ||
1da177e4 LT |
3923 | /** |
3924 | * kfree - free previously allocated memory | |
3925 | * @objp: pointer returned by kmalloc. | |
3926 | * | |
80e93eff PE |
3927 | * If @objp is NULL, no operation is performed. |
3928 | * | |
1da177e4 LT |
3929 | * Don't free memory not originally allocated by kmalloc() |
3930 | * or you will run into trouble. | |
3931 | */ | |
3932 | void kfree(const void *objp) | |
3933 | { | |
343e0d7a | 3934 | struct kmem_cache *c; |
1da177e4 LT |
3935 | unsigned long flags; |
3936 | ||
2121db74 PE |
3937 | trace_kfree(_RET_IP_, objp); |
3938 | ||
6cb8f913 | 3939 | if (unlikely(ZERO_OR_NULL_PTR(objp))) |
1da177e4 LT |
3940 | return; |
3941 | local_irq_save(flags); | |
3942 | kfree_debugcheck(objp); | |
6ed5eb22 | 3943 | c = virt_to_cache(objp); |
8c138bc0 CL |
3944 | debug_check_no_locks_freed(objp, c->object_size); |
3945 | ||
3946 | debug_check_no_obj_freed(objp, c->object_size); | |
7c0cb9c6 | 3947 | __cache_free(c, (void *)objp, _RET_IP_); |
1da177e4 LT |
3948 | local_irq_restore(flags); |
3949 | } | |
3950 | EXPORT_SYMBOL(kfree); | |
3951 | ||
e498be7d | 3952 | /* |
183ff22b | 3953 | * This initializes kmem_list3 or resizes various caches for all nodes. |
e498be7d | 3954 | */ |
83b519e8 | 3955 | static int alloc_kmemlist(struct kmem_cache *cachep, gfp_t gfp) |
e498be7d CL |
3956 | { |
3957 | int node; | |
3958 | struct kmem_list3 *l3; | |
cafeb02e | 3959 | struct array_cache *new_shared; |
3395ee05 | 3960 | struct array_cache **new_alien = NULL; |
e498be7d | 3961 | |
9c09a95c | 3962 | for_each_online_node(node) { |
cafeb02e | 3963 | |
3395ee05 | 3964 | if (use_alien_caches) { |
83b519e8 | 3965 | new_alien = alloc_alien_cache(node, cachep->limit, gfp); |
3395ee05 PM |
3966 | if (!new_alien) |
3967 | goto fail; | |
3968 | } | |
cafeb02e | 3969 | |
63109846 ED |
3970 | new_shared = NULL; |
3971 | if (cachep->shared) { | |
3972 | new_shared = alloc_arraycache(node, | |
0718dc2a | 3973 | cachep->shared*cachep->batchcount, |
83b519e8 | 3974 | 0xbaadf00d, gfp); |
63109846 ED |
3975 | if (!new_shared) { |
3976 | free_alien_cache(new_alien); | |
3977 | goto fail; | |
3978 | } | |
0718dc2a | 3979 | } |
cafeb02e | 3980 | |
a737b3e2 AM |
3981 | l3 = cachep->nodelists[node]; |
3982 | if (l3) { | |
cafeb02e CL |
3983 | struct array_cache *shared = l3->shared; |
3984 | ||
e498be7d CL |
3985 | spin_lock_irq(&l3->list_lock); |
3986 | ||
cafeb02e | 3987 | if (shared) |
0718dc2a CL |
3988 | free_block(cachep, shared->entry, |
3989 | shared->avail, node); | |
e498be7d | 3990 | |
cafeb02e CL |
3991 | l3->shared = new_shared; |
3992 | if (!l3->alien) { | |
e498be7d CL |
3993 | l3->alien = new_alien; |
3994 | new_alien = NULL; | |
3995 | } | |
b28a02de | 3996 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 3997 | cachep->batchcount + cachep->num; |
e498be7d | 3998 | spin_unlock_irq(&l3->list_lock); |
cafeb02e | 3999 | kfree(shared); |
e498be7d CL |
4000 | free_alien_cache(new_alien); |
4001 | continue; | |
4002 | } | |
83b519e8 | 4003 | l3 = kmalloc_node(sizeof(struct kmem_list3), gfp, node); |
0718dc2a CL |
4004 | if (!l3) { |
4005 | free_alien_cache(new_alien); | |
4006 | kfree(new_shared); | |
e498be7d | 4007 | goto fail; |
0718dc2a | 4008 | } |
e498be7d CL |
4009 | |
4010 | kmem_list3_init(l3); | |
4011 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + | |
a737b3e2 | 4012 | ((unsigned long)cachep) % REAPTIMEOUT_LIST3; |
cafeb02e | 4013 | l3->shared = new_shared; |
e498be7d | 4014 | l3->alien = new_alien; |
b28a02de | 4015 | l3->free_limit = (1 + nr_cpus_node(node)) * |
a737b3e2 | 4016 | cachep->batchcount + cachep->num; |
e498be7d CL |
4017 | cachep->nodelists[node] = l3; |
4018 | } | |
cafeb02e | 4019 | return 0; |
0718dc2a | 4020 | |
a737b3e2 | 4021 | fail: |
3b0efdfa | 4022 | if (!cachep->list.next) { |
0718dc2a CL |
4023 | /* Cache is not active yet. Roll back what we did */ |
4024 | node--; | |
4025 | while (node >= 0) { | |
4026 | if (cachep->nodelists[node]) { | |
4027 | l3 = cachep->nodelists[node]; | |
4028 | ||
4029 | kfree(l3->shared); | |
4030 | free_alien_cache(l3->alien); | |
4031 | kfree(l3); | |
4032 | cachep->nodelists[node] = NULL; | |
4033 | } | |
4034 | node--; | |
4035 | } | |
4036 | } | |
cafeb02e | 4037 | return -ENOMEM; |
e498be7d CL |
4038 | } |
4039 | ||
1da177e4 | 4040 | struct ccupdate_struct { |
343e0d7a | 4041 | struct kmem_cache *cachep; |
acfe7d74 | 4042 | struct array_cache *new[0]; |
1da177e4 LT |
4043 | }; |
4044 | ||
4045 | static void do_ccupdate_local(void *info) | |
4046 | { | |
a737b3e2 | 4047 | struct ccupdate_struct *new = info; |
1da177e4 LT |
4048 | struct array_cache *old; |
4049 | ||
4050 | check_irq_off(); | |
9a2dba4b | 4051 | old = cpu_cache_get(new->cachep); |
e498be7d | 4052 | |
1da177e4 LT |
4053 | new->cachep->array[smp_processor_id()] = new->new[smp_processor_id()]; |
4054 | new->new[smp_processor_id()] = old; | |
4055 | } | |
4056 | ||
18004c5d | 4057 | /* Always called with the slab_mutex held */ |
a737b3e2 | 4058 | static int do_tune_cpucache(struct kmem_cache *cachep, int limit, |
83b519e8 | 4059 | int batchcount, int shared, gfp_t gfp) |
1da177e4 | 4060 | { |
d2e7b7d0 | 4061 | struct ccupdate_struct *new; |
2ed3a4ef | 4062 | int i; |
1da177e4 | 4063 | |
acfe7d74 ED |
4064 | new = kzalloc(sizeof(*new) + nr_cpu_ids * sizeof(struct array_cache *), |
4065 | gfp); | |
d2e7b7d0 SS |
4066 | if (!new) |
4067 | return -ENOMEM; | |
4068 | ||
e498be7d | 4069 | for_each_online_cpu(i) { |
7d6e6d09 | 4070 | new->new[i] = alloc_arraycache(cpu_to_mem(i), limit, |
83b519e8 | 4071 | batchcount, gfp); |
d2e7b7d0 | 4072 | if (!new->new[i]) { |
b28a02de | 4073 | for (i--; i >= 0; i--) |
d2e7b7d0 SS |
4074 | kfree(new->new[i]); |
4075 | kfree(new); | |
e498be7d | 4076 | return -ENOMEM; |
1da177e4 LT |
4077 | } |
4078 | } | |
d2e7b7d0 | 4079 | new->cachep = cachep; |
1da177e4 | 4080 | |
15c8b6c1 | 4081 | on_each_cpu(do_ccupdate_local, (void *)new, 1); |
e498be7d | 4082 | |
1da177e4 | 4083 | check_irq_on(); |
1da177e4 LT |
4084 | cachep->batchcount = batchcount; |
4085 | cachep->limit = limit; | |
e498be7d | 4086 | cachep->shared = shared; |
1da177e4 | 4087 | |
e498be7d | 4088 | for_each_online_cpu(i) { |
d2e7b7d0 | 4089 | struct array_cache *ccold = new->new[i]; |
1da177e4 LT |
4090 | if (!ccold) |
4091 | continue; | |
7d6e6d09 LS |
4092 | spin_lock_irq(&cachep->nodelists[cpu_to_mem(i)]->list_lock); |
4093 | free_block(cachep, ccold->entry, ccold->avail, cpu_to_mem(i)); | |
4094 | spin_unlock_irq(&cachep->nodelists[cpu_to_mem(i)]->list_lock); | |
1da177e4 LT |
4095 | kfree(ccold); |
4096 | } | |
d2e7b7d0 | 4097 | kfree(new); |
83b519e8 | 4098 | return alloc_kmemlist(cachep, gfp); |
1da177e4 LT |
4099 | } |
4100 | ||
18004c5d | 4101 | /* Called with slab_mutex held always */ |
83b519e8 | 4102 | static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp) |
1da177e4 LT |
4103 | { |
4104 | int err; | |
4105 | int limit, shared; | |
4106 | ||
a737b3e2 AM |
4107 | /* |
4108 | * The head array serves three purposes: | |
1da177e4 LT |
4109 | * - create a LIFO ordering, i.e. return objects that are cache-warm |
4110 | * - reduce the number of spinlock operations. | |
a737b3e2 | 4111 | * - reduce the number of linked list operations on the slab and |
1da177e4 LT |
4112 | * bufctl chains: array operations are cheaper. |
4113 | * The numbers are guessed, we should auto-tune as described by | |
4114 | * Bonwick. | |
4115 | */ | |
3b0efdfa | 4116 | if (cachep->size > 131072) |
1da177e4 | 4117 | limit = 1; |
3b0efdfa | 4118 | else if (cachep->size > PAGE_SIZE) |
1da177e4 | 4119 | limit = 8; |
3b0efdfa | 4120 | else if (cachep->size > 1024) |
1da177e4 | 4121 | limit = 24; |
3b0efdfa | 4122 | else if (cachep->size > 256) |
1da177e4 LT |
4123 | limit = 54; |
4124 | else | |
4125 | limit = 120; | |
4126 | ||
a737b3e2 AM |
4127 | /* |
4128 | * CPU bound tasks (e.g. network routing) can exhibit cpu bound | |
1da177e4 LT |
4129 | * allocation behaviour: Most allocs on one cpu, most free operations |
4130 | * on another cpu. For these cases, an efficient object passing between | |
4131 | * cpus is necessary. This is provided by a shared array. The array | |
4132 | * replaces Bonwick's magazine layer. | |
4133 | * On uniprocessor, it's functionally equivalent (but less efficient) | |
4134 | * to a larger limit. Thus disabled by default. | |
4135 | */ | |
4136 | shared = 0; | |
3b0efdfa | 4137 | if (cachep->size <= PAGE_SIZE && num_possible_cpus() > 1) |
1da177e4 | 4138 | shared = 8; |
1da177e4 LT |
4139 | |
4140 | #if DEBUG | |
a737b3e2 AM |
4141 | /* |
4142 | * With debugging enabled, large batchcount lead to excessively long | |
4143 | * periods with disabled local interrupts. Limit the batchcount | |
1da177e4 LT |
4144 | */ |
4145 | if (limit > 32) | |
4146 | limit = 32; | |
4147 | #endif | |
83b519e8 | 4148 | err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared, gfp); |
1da177e4 LT |
4149 | if (err) |
4150 | printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n", | |
b28a02de | 4151 | cachep->name, -err); |
2ed3a4ef | 4152 | return err; |
1da177e4 LT |
4153 | } |
4154 | ||
1b55253a CL |
4155 | /* |
4156 | * Drain an array if it contains any elements taking the l3 lock only if | |
b18e7e65 CL |
4157 | * necessary. Note that the l3 listlock also protects the array_cache |
4158 | * if drain_array() is used on the shared array. | |
1b55253a | 4159 | */ |
68a1b195 | 4160 | static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, |
1b55253a | 4161 | struct array_cache *ac, int force, int node) |
1da177e4 LT |
4162 | { |
4163 | int tofree; | |
4164 | ||
1b55253a CL |
4165 | if (!ac || !ac->avail) |
4166 | return; | |
1da177e4 LT |
4167 | if (ac->touched && !force) { |
4168 | ac->touched = 0; | |
b18e7e65 | 4169 | } else { |
1b55253a | 4170 | spin_lock_irq(&l3->list_lock); |
b18e7e65 CL |
4171 | if (ac->avail) { |
4172 | tofree = force ? ac->avail : (ac->limit + 4) / 5; | |
4173 | if (tofree > ac->avail) | |
4174 | tofree = (ac->avail + 1) / 2; | |
4175 | free_block(cachep, ac->entry, tofree, node); | |
4176 | ac->avail -= tofree; | |
4177 | memmove(ac->entry, &(ac->entry[tofree]), | |
4178 | sizeof(void *) * ac->avail); | |
4179 | } | |
1b55253a | 4180 | spin_unlock_irq(&l3->list_lock); |
1da177e4 LT |
4181 | } |
4182 | } | |
4183 | ||
4184 | /** | |
4185 | * cache_reap - Reclaim memory from caches. | |
05fb6bf0 | 4186 | * @w: work descriptor |
1da177e4 LT |
4187 | * |
4188 | * Called from workqueue/eventd every few seconds. | |
4189 | * Purpose: | |
4190 | * - clear the per-cpu caches for this CPU. | |
4191 | * - return freeable pages to the main free memory pool. | |
4192 | * | |
a737b3e2 AM |
4193 | * If we cannot acquire the cache chain mutex then just give up - we'll try |
4194 | * again on the next iteration. | |
1da177e4 | 4195 | */ |
7c5cae36 | 4196 | static void cache_reap(struct work_struct *w) |
1da177e4 | 4197 | { |
7a7c381d | 4198 | struct kmem_cache *searchp; |
e498be7d | 4199 | struct kmem_list3 *l3; |
7d6e6d09 | 4200 | int node = numa_mem_id(); |
bf6aede7 | 4201 | struct delayed_work *work = to_delayed_work(w); |
1da177e4 | 4202 | |
18004c5d | 4203 | if (!mutex_trylock(&slab_mutex)) |
1da177e4 | 4204 | /* Give up. Setup the next iteration. */ |
7c5cae36 | 4205 | goto out; |
1da177e4 | 4206 | |
18004c5d | 4207 | list_for_each_entry(searchp, &slab_caches, list) { |
1da177e4 LT |
4208 | check_irq_on(); |
4209 | ||
35386e3b CL |
4210 | /* |
4211 | * We only take the l3 lock if absolutely necessary and we | |
4212 | * have established with reasonable certainty that | |
4213 | * we can do some work if the lock was obtained. | |
4214 | */ | |
aab2207c | 4215 | l3 = searchp->nodelists[node]; |
35386e3b | 4216 | |
8fce4d8e | 4217 | reap_alien(searchp, l3); |
1da177e4 | 4218 | |
aab2207c | 4219 | drain_array(searchp, l3, cpu_cache_get(searchp), 0, node); |
1da177e4 | 4220 | |
35386e3b CL |
4221 | /* |
4222 | * These are racy checks but it does not matter | |
4223 | * if we skip one check or scan twice. | |
4224 | */ | |
e498be7d | 4225 | if (time_after(l3->next_reap, jiffies)) |
35386e3b | 4226 | goto next; |
1da177e4 | 4227 | |
e498be7d | 4228 | l3->next_reap = jiffies + REAPTIMEOUT_LIST3; |
1da177e4 | 4229 | |
aab2207c | 4230 | drain_array(searchp, l3, l3->shared, 0, node); |
1da177e4 | 4231 | |
ed11d9eb | 4232 | if (l3->free_touched) |
e498be7d | 4233 | l3->free_touched = 0; |
ed11d9eb CL |
4234 | else { |
4235 | int freed; | |
1da177e4 | 4236 | |
ed11d9eb CL |
4237 | freed = drain_freelist(searchp, l3, (l3->free_limit + |
4238 | 5 * searchp->num - 1) / (5 * searchp->num)); | |
4239 | STATS_ADD_REAPED(searchp, freed); | |
4240 | } | |
35386e3b | 4241 | next: |
1da177e4 LT |
4242 | cond_resched(); |
4243 | } | |
4244 | check_irq_on(); | |
18004c5d | 4245 | mutex_unlock(&slab_mutex); |
8fce4d8e | 4246 | next_reap_node(); |
7c5cae36 | 4247 | out: |
a737b3e2 | 4248 | /* Set up the next iteration */ |
7c5cae36 | 4249 | schedule_delayed_work(work, round_jiffies_relative(REAPTIMEOUT_CPUC)); |
1da177e4 LT |
4250 | } |
4251 | ||
158a9624 | 4252 | #ifdef CONFIG_SLABINFO |
0d7561c6 | 4253 | void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo) |
1da177e4 | 4254 | { |
b28a02de PE |
4255 | struct slab *slabp; |
4256 | unsigned long active_objs; | |
4257 | unsigned long num_objs; | |
4258 | unsigned long active_slabs = 0; | |
4259 | unsigned long num_slabs, free_objects = 0, shared_avail = 0; | |
e498be7d | 4260 | const char *name; |
1da177e4 | 4261 | char *error = NULL; |
e498be7d CL |
4262 | int node; |
4263 | struct kmem_list3 *l3; | |
1da177e4 | 4264 | |
1da177e4 LT |
4265 | active_objs = 0; |
4266 | num_slabs = 0; | |
e498be7d CL |
4267 | for_each_online_node(node) { |
4268 | l3 = cachep->nodelists[node]; | |
4269 | if (!l3) | |
4270 | continue; | |
4271 | ||
ca3b9b91 RT |
4272 | check_irq_on(); |
4273 | spin_lock_irq(&l3->list_lock); | |
e498be7d | 4274 | |
7a7c381d | 4275 | list_for_each_entry(slabp, &l3->slabs_full, list) { |
e498be7d CL |
4276 | if (slabp->inuse != cachep->num && !error) |
4277 | error = "slabs_full accounting error"; | |
4278 | active_objs += cachep->num; | |
4279 | active_slabs++; | |
4280 | } | |
7a7c381d | 4281 | list_for_each_entry(slabp, &l3->slabs_partial, list) { |
e498be7d CL |
4282 | if (slabp->inuse == cachep->num && !error) |
4283 | error = "slabs_partial inuse accounting error"; | |
4284 | if (!slabp->inuse && !error) | |
4285 | error = "slabs_partial/inuse accounting error"; | |
4286 | active_objs += slabp->inuse; | |
4287 | active_slabs++; | |
4288 | } | |
7a7c381d | 4289 | list_for_each_entry(slabp, &l3->slabs_free, list) { |
e498be7d CL |
4290 | if (slabp->inuse && !error) |
4291 | error = "slabs_free/inuse accounting error"; | |
4292 | num_slabs++; | |
4293 | } | |
4294 | free_objects += l3->free_objects; | |
4484ebf1 RT |
4295 | if (l3->shared) |
4296 | shared_avail += l3->shared->avail; | |
e498be7d | 4297 | |
ca3b9b91 | 4298 | spin_unlock_irq(&l3->list_lock); |
1da177e4 | 4299 | } |
b28a02de PE |
4300 | num_slabs += active_slabs; |
4301 | num_objs = num_slabs * cachep->num; | |
e498be7d | 4302 | if (num_objs - active_objs != free_objects && !error) |
1da177e4 LT |
4303 | error = "free_objects accounting error"; |
4304 | ||
b28a02de | 4305 | name = cachep->name; |
1da177e4 LT |
4306 | if (error) |
4307 | printk(KERN_ERR "slab: cache %s error: %s\n", name, error); | |
4308 | ||
0d7561c6 GC |
4309 | sinfo->active_objs = active_objs; |
4310 | sinfo->num_objs = num_objs; | |
4311 | sinfo->active_slabs = active_slabs; | |
4312 | sinfo->num_slabs = num_slabs; | |
4313 | sinfo->shared_avail = shared_avail; | |
4314 | sinfo->limit = cachep->limit; | |
4315 | sinfo->batchcount = cachep->batchcount; | |
4316 | sinfo->shared = cachep->shared; | |
4317 | sinfo->objects_per_slab = cachep->num; | |
4318 | sinfo->cache_order = cachep->gfporder; | |
4319 | } | |
4320 | ||
4321 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *cachep) | |
4322 | { | |
1da177e4 | 4323 | #if STATS |
b28a02de | 4324 | { /* list3 stats */ |
1da177e4 LT |
4325 | unsigned long high = cachep->high_mark; |
4326 | unsigned long allocs = cachep->num_allocations; | |
4327 | unsigned long grown = cachep->grown; | |
4328 | unsigned long reaped = cachep->reaped; | |
4329 | unsigned long errors = cachep->errors; | |
4330 | unsigned long max_freeable = cachep->max_freeable; | |
1da177e4 | 4331 | unsigned long node_allocs = cachep->node_allocs; |
e498be7d | 4332 | unsigned long node_frees = cachep->node_frees; |
fb7faf33 | 4333 | unsigned long overflows = cachep->node_overflow; |
1da177e4 | 4334 | |
e92dd4fd JP |
4335 | seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu " |
4336 | "%4lu %4lu %4lu %4lu %4lu", | |
4337 | allocs, high, grown, | |
4338 | reaped, errors, max_freeable, node_allocs, | |
4339 | node_frees, overflows); | |
1da177e4 LT |
4340 | } |
4341 | /* cpu stats */ | |
4342 | { | |
4343 | unsigned long allochit = atomic_read(&cachep->allochit); | |
4344 | unsigned long allocmiss = atomic_read(&cachep->allocmiss); | |
4345 | unsigned long freehit = atomic_read(&cachep->freehit); | |
4346 | unsigned long freemiss = atomic_read(&cachep->freemiss); | |
4347 | ||
4348 | seq_printf(m, " : cpustat %6lu %6lu %6lu %6lu", | |
b28a02de | 4349 | allochit, allocmiss, freehit, freemiss); |
1da177e4 LT |
4350 | } |
4351 | #endif | |
1da177e4 LT |
4352 | } |
4353 | ||
1da177e4 LT |
4354 | #define MAX_SLABINFO_WRITE 128 |
4355 | /** | |
4356 | * slabinfo_write - Tuning for the slab allocator | |
4357 | * @file: unused | |
4358 | * @buffer: user buffer | |
4359 | * @count: data length | |
4360 | * @ppos: unused | |
4361 | */ | |
b7454ad3 | 4362 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
b28a02de | 4363 | size_t count, loff_t *ppos) |
1da177e4 | 4364 | { |
b28a02de | 4365 | char kbuf[MAX_SLABINFO_WRITE + 1], *tmp; |
1da177e4 | 4366 | int limit, batchcount, shared, res; |
7a7c381d | 4367 | struct kmem_cache *cachep; |
b28a02de | 4368 | |
1da177e4 LT |
4369 | if (count > MAX_SLABINFO_WRITE) |
4370 | return -EINVAL; | |
4371 | if (copy_from_user(&kbuf, buffer, count)) | |
4372 | return -EFAULT; | |
b28a02de | 4373 | kbuf[MAX_SLABINFO_WRITE] = '\0'; |
1da177e4 LT |
4374 | |
4375 | tmp = strchr(kbuf, ' '); | |
4376 | if (!tmp) | |
4377 | return -EINVAL; | |
4378 | *tmp = '\0'; | |
4379 | tmp++; | |
4380 | if (sscanf(tmp, " %d %d %d", &limit, &batchcount, &shared) != 3) | |
4381 | return -EINVAL; | |
4382 | ||
4383 | /* Find the cache in the chain of caches. */ | |
18004c5d | 4384 | mutex_lock(&slab_mutex); |
1da177e4 | 4385 | res = -EINVAL; |
18004c5d | 4386 | list_for_each_entry(cachep, &slab_caches, list) { |
1da177e4 | 4387 | if (!strcmp(cachep->name, kbuf)) { |
a737b3e2 AM |
4388 | if (limit < 1 || batchcount < 1 || |
4389 | batchcount > limit || shared < 0) { | |
e498be7d | 4390 | res = 0; |
1da177e4 | 4391 | } else { |
e498be7d | 4392 | res = do_tune_cpucache(cachep, limit, |
83b519e8 PE |
4393 | batchcount, shared, |
4394 | GFP_KERNEL); | |
1da177e4 LT |
4395 | } |
4396 | break; | |
4397 | } | |
4398 | } | |
18004c5d | 4399 | mutex_unlock(&slab_mutex); |
1da177e4 LT |
4400 | if (res >= 0) |
4401 | res = count; | |
4402 | return res; | |
4403 | } | |
871751e2 AV |
4404 | |
4405 | #ifdef CONFIG_DEBUG_SLAB_LEAK | |
4406 | ||
4407 | static void *leaks_start(struct seq_file *m, loff_t *pos) | |
4408 | { | |
18004c5d CL |
4409 | mutex_lock(&slab_mutex); |
4410 | return seq_list_start(&slab_caches, *pos); | |
871751e2 AV |
4411 | } |
4412 | ||
4413 | static inline int add_caller(unsigned long *n, unsigned long v) | |
4414 | { | |
4415 | unsigned long *p; | |
4416 | int l; | |
4417 | if (!v) | |
4418 | return 1; | |
4419 | l = n[1]; | |
4420 | p = n + 2; | |
4421 | while (l) { | |
4422 | int i = l/2; | |
4423 | unsigned long *q = p + 2 * i; | |
4424 | if (*q == v) { | |
4425 | q[1]++; | |
4426 | return 1; | |
4427 | } | |
4428 | if (*q > v) { | |
4429 | l = i; | |
4430 | } else { | |
4431 | p = q + 2; | |
4432 | l -= i + 1; | |
4433 | } | |
4434 | } | |
4435 | if (++n[1] == n[0]) | |
4436 | return 0; | |
4437 | memmove(p + 2, p, n[1] * 2 * sizeof(unsigned long) - ((void *)p - (void *)n)); | |
4438 | p[0] = v; | |
4439 | p[1] = 1; | |
4440 | return 1; | |
4441 | } | |
4442 | ||
4443 | static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s) | |
4444 | { | |
4445 | void *p; | |
4446 | int i; | |
4447 | if (n[0] == n[1]) | |
4448 | return; | |
3b0efdfa | 4449 | for (i = 0, p = s->s_mem; i < c->num; i++, p += c->size) { |
871751e2 AV |
4450 | if (slab_bufctl(s)[i] != BUFCTL_ACTIVE) |
4451 | continue; | |
4452 | if (!add_caller(n, (unsigned long)*dbg_userword(c, p))) | |
4453 | return; | |
4454 | } | |
4455 | } | |
4456 | ||
4457 | static void show_symbol(struct seq_file *m, unsigned long address) | |
4458 | { | |
4459 | #ifdef CONFIG_KALLSYMS | |
871751e2 | 4460 | unsigned long offset, size; |
9281acea | 4461 | char modname[MODULE_NAME_LEN], name[KSYM_NAME_LEN]; |
871751e2 | 4462 | |
a5c43dae | 4463 | if (lookup_symbol_attrs(address, &size, &offset, modname, name) == 0) { |
871751e2 | 4464 | seq_printf(m, "%s+%#lx/%#lx", name, offset, size); |
a5c43dae | 4465 | if (modname[0]) |
871751e2 AV |
4466 | seq_printf(m, " [%s]", modname); |
4467 | return; | |
4468 | } | |
4469 | #endif | |
4470 | seq_printf(m, "%p", (void *)address); | |
4471 | } | |
4472 | ||
4473 | static int leaks_show(struct seq_file *m, void *p) | |
4474 | { | |
0672aa7c | 4475 | struct kmem_cache *cachep = list_entry(p, struct kmem_cache, list); |
871751e2 AV |
4476 | struct slab *slabp; |
4477 | struct kmem_list3 *l3; | |
4478 | const char *name; | |
4479 | unsigned long *n = m->private; | |
4480 | int node; | |
4481 | int i; | |
4482 | ||
4483 | if (!(cachep->flags & SLAB_STORE_USER)) | |
4484 | return 0; | |
4485 | if (!(cachep->flags & SLAB_RED_ZONE)) | |
4486 | return 0; | |
4487 | ||
4488 | /* OK, we can do it */ | |
4489 | ||
4490 | n[1] = 0; | |
4491 | ||
4492 | for_each_online_node(node) { | |
4493 | l3 = cachep->nodelists[node]; | |
4494 | if (!l3) | |
4495 | continue; | |
4496 | ||
4497 | check_irq_on(); | |
4498 | spin_lock_irq(&l3->list_lock); | |
4499 | ||
7a7c381d | 4500 | list_for_each_entry(slabp, &l3->slabs_full, list) |
871751e2 | 4501 | handle_slab(n, cachep, slabp); |
7a7c381d | 4502 | list_for_each_entry(slabp, &l3->slabs_partial, list) |
871751e2 | 4503 | handle_slab(n, cachep, slabp); |
871751e2 AV |
4504 | spin_unlock_irq(&l3->list_lock); |
4505 | } | |
4506 | name = cachep->name; | |
4507 | if (n[0] == n[1]) { | |
4508 | /* Increase the buffer size */ | |
18004c5d | 4509 | mutex_unlock(&slab_mutex); |
871751e2 AV |
4510 | m->private = kzalloc(n[0] * 4 * sizeof(unsigned long), GFP_KERNEL); |
4511 | if (!m->private) { | |
4512 | /* Too bad, we are really out */ | |
4513 | m->private = n; | |
18004c5d | 4514 | mutex_lock(&slab_mutex); |
871751e2 AV |
4515 | return -ENOMEM; |
4516 | } | |
4517 | *(unsigned long *)m->private = n[0] * 2; | |
4518 | kfree(n); | |
18004c5d | 4519 | mutex_lock(&slab_mutex); |
871751e2 AV |
4520 | /* Now make sure this entry will be retried */ |
4521 | m->count = m->size; | |
4522 | return 0; | |
4523 | } | |
4524 | for (i = 0; i < n[1]; i++) { | |
4525 | seq_printf(m, "%s: %lu ", name, n[2*i+3]); | |
4526 | show_symbol(m, n[2*i+2]); | |
4527 | seq_putc(m, '\n'); | |
4528 | } | |
d2e7b7d0 | 4529 | |
871751e2 AV |
4530 | return 0; |
4531 | } | |
4532 | ||
b7454ad3 GC |
4533 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) |
4534 | { | |
4535 | return seq_list_next(p, &slab_caches, pos); | |
4536 | } | |
4537 | ||
4538 | static void s_stop(struct seq_file *m, void *p) | |
4539 | { | |
4540 | mutex_unlock(&slab_mutex); | |
4541 | } | |
4542 | ||
a0ec95a8 | 4543 | static const struct seq_operations slabstats_op = { |
871751e2 AV |
4544 | .start = leaks_start, |
4545 | .next = s_next, | |
4546 | .stop = s_stop, | |
4547 | .show = leaks_show, | |
4548 | }; | |
a0ec95a8 AD |
4549 | |
4550 | static int slabstats_open(struct inode *inode, struct file *file) | |
4551 | { | |
4552 | unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
4553 | int ret = -ENOMEM; | |
4554 | if (n) { | |
4555 | ret = seq_open(file, &slabstats_op); | |
4556 | if (!ret) { | |
4557 | struct seq_file *m = file->private_data; | |
4558 | *n = PAGE_SIZE / (2 * sizeof(unsigned long)); | |
4559 | m->private = n; | |
4560 | n = NULL; | |
4561 | } | |
4562 | kfree(n); | |
4563 | } | |
4564 | return ret; | |
4565 | } | |
4566 | ||
4567 | static const struct file_operations proc_slabstats_operations = { | |
4568 | .open = slabstats_open, | |
4569 | .read = seq_read, | |
4570 | .llseek = seq_lseek, | |
4571 | .release = seq_release_private, | |
4572 | }; | |
4573 | #endif | |
4574 | ||
4575 | static int __init slab_proc_init(void) | |
4576 | { | |
4577 | #ifdef CONFIG_DEBUG_SLAB_LEAK | |
4578 | proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations); | |
871751e2 | 4579 | #endif |
a0ec95a8 AD |
4580 | return 0; |
4581 | } | |
4582 | module_init(slab_proc_init); | |
1da177e4 LT |
4583 | #endif |
4584 | ||
00e145b6 MS |
4585 | /** |
4586 | * ksize - get the actual amount of memory allocated for a given object | |
4587 | * @objp: Pointer to the object | |
4588 | * | |
4589 | * kmalloc may internally round up allocations and return more memory | |
4590 | * than requested. ksize() can be used to determine the actual amount of | |
4591 | * memory allocated. The caller may use this additional memory, even though | |
4592 | * a smaller amount of memory was initially specified with the kmalloc call. | |
4593 | * The caller must guarantee that objp points to a valid object previously | |
4594 | * allocated with either kmalloc() or kmem_cache_alloc(). The object | |
4595 | * must not be freed during the duration of the call. | |
4596 | */ | |
fd76bab2 | 4597 | size_t ksize(const void *objp) |
1da177e4 | 4598 | { |
ef8b4520 CL |
4599 | BUG_ON(!objp); |
4600 | if (unlikely(objp == ZERO_SIZE_PTR)) | |
00e145b6 | 4601 | return 0; |
1da177e4 | 4602 | |
8c138bc0 | 4603 | return virt_to_cache(objp)->object_size; |
1da177e4 | 4604 | } |
b1aabecd | 4605 | EXPORT_SYMBOL(ksize); |