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Commit | Line | Data |
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81819f0f CL |
1 | /* |
2 | * SLUB: A slab allocator that limits cache line use instead of queuing | |
3 | * objects in per cpu and per node lists. | |
4 | * | |
881db7fb CL |
5 | * The allocator synchronizes using per slab locks or atomic operatios |
6 | * and only uses a centralized lock to manage a pool of partial slabs. | |
81819f0f | 7 | * |
cde53535 | 8 | * (C) 2007 SGI, Christoph Lameter |
881db7fb | 9 | * (C) 2011 Linux Foundation, Christoph Lameter |
81819f0f CL |
10 | */ |
11 | ||
12 | #include <linux/mm.h> | |
1eb5ac64 | 13 | #include <linux/swap.h> /* struct reclaim_state */ |
81819f0f CL |
14 | #include <linux/module.h> |
15 | #include <linux/bit_spinlock.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <linux/slab.h> | |
97d06609 | 19 | #include "slab.h" |
7b3c3a50 | 20 | #include <linux/proc_fs.h> |
3ac38faa | 21 | #include <linux/notifier.h> |
81819f0f | 22 | #include <linux/seq_file.h> |
a79316c6 | 23 | #include <linux/kasan.h> |
5a896d9e | 24 | #include <linux/kmemcheck.h> |
81819f0f CL |
25 | #include <linux/cpu.h> |
26 | #include <linux/cpuset.h> | |
27 | #include <linux/mempolicy.h> | |
28 | #include <linux/ctype.h> | |
3ac7fe5a | 29 | #include <linux/debugobjects.h> |
81819f0f | 30 | #include <linux/kallsyms.h> |
b9049e23 | 31 | #include <linux/memory.h> |
f8bd2258 | 32 | #include <linux/math64.h> |
773ff60e | 33 | #include <linux/fault-inject.h> |
bfa71457 | 34 | #include <linux/stacktrace.h> |
4de900b4 | 35 | #include <linux/prefetch.h> |
2633d7a0 | 36 | #include <linux/memcontrol.h> |
81819f0f | 37 | |
4a92379b RK |
38 | #include <trace/events/kmem.h> |
39 | ||
072bb0aa MG |
40 | #include "internal.h" |
41 | ||
81819f0f CL |
42 | /* |
43 | * Lock order: | |
18004c5d | 44 | * 1. slab_mutex (Global Mutex) |
881db7fb CL |
45 | * 2. node->list_lock |
46 | * 3. slab_lock(page) (Only on some arches and for debugging) | |
81819f0f | 47 | * |
18004c5d | 48 | * slab_mutex |
881db7fb | 49 | * |
18004c5d | 50 | * The role of the slab_mutex is to protect the list of all the slabs |
881db7fb CL |
51 | * and to synchronize major metadata changes to slab cache structures. |
52 | * | |
53 | * The slab_lock is only used for debugging and on arches that do not | |
54 | * have the ability to do a cmpxchg_double. It only protects the second | |
55 | * double word in the page struct. Meaning | |
56 | * A. page->freelist -> List of object free in a page | |
57 | * B. page->counters -> Counters of objects | |
58 | * C. page->frozen -> frozen state | |
59 | * | |
60 | * If a slab is frozen then it is exempt from list management. It is not | |
61 | * on any list. The processor that froze the slab is the one who can | |
62 | * perform list operations on the page. Other processors may put objects | |
63 | * onto the freelist but the processor that froze the slab is the only | |
64 | * one that can retrieve the objects from the page's freelist. | |
81819f0f CL |
65 | * |
66 | * The list_lock protects the partial and full list on each node and | |
67 | * the partial slab counter. If taken then no new slabs may be added or | |
68 | * removed from the lists nor make the number of partial slabs be modified. | |
69 | * (Note that the total number of slabs is an atomic value that may be | |
70 | * modified without taking the list lock). | |
71 | * | |
72 | * The list_lock is a centralized lock and thus we avoid taking it as | |
73 | * much as possible. As long as SLUB does not have to handle partial | |
74 | * slabs, operations can continue without any centralized lock. F.e. | |
75 | * allocating a long series of objects that fill up slabs does not require | |
76 | * the list lock. | |
81819f0f CL |
77 | * Interrupts are disabled during allocation and deallocation in order to |
78 | * make the slab allocator safe to use in the context of an irq. In addition | |
79 | * interrupts are disabled to ensure that the processor does not change | |
80 | * while handling per_cpu slabs, due to kernel preemption. | |
81 | * | |
82 | * SLUB assigns one slab for allocation to each processor. | |
83 | * Allocations only occur from these slabs called cpu slabs. | |
84 | * | |
672bba3a CL |
85 | * Slabs with free elements are kept on a partial list and during regular |
86 | * operations no list for full slabs is used. If an object in a full slab is | |
81819f0f | 87 | * freed then the slab will show up again on the partial lists. |
672bba3a CL |
88 | * We track full slabs for debugging purposes though because otherwise we |
89 | * cannot scan all objects. | |
81819f0f CL |
90 | * |
91 | * Slabs are freed when they become empty. Teardown and setup is | |
92 | * minimal so we rely on the page allocators per cpu caches for | |
93 | * fast frees and allocs. | |
94 | * | |
95 | * Overloading of page flags that are otherwise used for LRU management. | |
96 | * | |
4b6f0750 CL |
97 | * PageActive The slab is frozen and exempt from list processing. |
98 | * This means that the slab is dedicated to a purpose | |
99 | * such as satisfying allocations for a specific | |
100 | * processor. Objects may be freed in the slab while | |
101 | * it is frozen but slab_free will then skip the usual | |
102 | * list operations. It is up to the processor holding | |
103 | * the slab to integrate the slab into the slab lists | |
104 | * when the slab is no longer needed. | |
105 | * | |
106 | * One use of this flag is to mark slabs that are | |
107 | * used for allocations. Then such a slab becomes a cpu | |
108 | * slab. The cpu slab may be equipped with an additional | |
dfb4f096 | 109 | * freelist that allows lockless access to |
894b8788 CL |
110 | * free objects in addition to the regular freelist |
111 | * that requires the slab lock. | |
81819f0f CL |
112 | * |
113 | * PageError Slab requires special handling due to debug | |
114 | * options set. This moves slab handling out of | |
894b8788 | 115 | * the fast path and disables lockless freelists. |
81819f0f CL |
116 | */ |
117 | ||
af537b0a CL |
118 | static inline int kmem_cache_debug(struct kmem_cache *s) |
119 | { | |
5577bd8a | 120 | #ifdef CONFIG_SLUB_DEBUG |
af537b0a | 121 | return unlikely(s->flags & SLAB_DEBUG_FLAGS); |
5577bd8a | 122 | #else |
af537b0a | 123 | return 0; |
5577bd8a | 124 | #endif |
af537b0a | 125 | } |
5577bd8a | 126 | |
c146a2b9 | 127 | inline void *fixup_red_left(struct kmem_cache *s, void *p) |
d86bd1be JK |
128 | { |
129 | if (kmem_cache_debug(s) && s->flags & SLAB_RED_ZONE) | |
130 | p += s->red_left_pad; | |
131 | ||
132 | return p; | |
133 | } | |
134 | ||
345c905d JK |
135 | static inline bool kmem_cache_has_cpu_partial(struct kmem_cache *s) |
136 | { | |
137 | #ifdef CONFIG_SLUB_CPU_PARTIAL | |
138 | return !kmem_cache_debug(s); | |
139 | #else | |
140 | return false; | |
141 | #endif | |
142 | } | |
143 | ||
81819f0f CL |
144 | /* |
145 | * Issues still to be resolved: | |
146 | * | |
81819f0f CL |
147 | * - Support PAGE_ALLOC_DEBUG. Should be easy to do. |
148 | * | |
81819f0f CL |
149 | * - Variable sizing of the per node arrays |
150 | */ | |
151 | ||
152 | /* Enable to test recovery from slab corruption on boot */ | |
153 | #undef SLUB_RESILIENCY_TEST | |
154 | ||
b789ef51 CL |
155 | /* Enable to log cmpxchg failures */ |
156 | #undef SLUB_DEBUG_CMPXCHG | |
157 | ||
2086d26a CL |
158 | /* |
159 | * Mininum number of partial slabs. These will be left on the partial | |
160 | * lists even if they are empty. kmem_cache_shrink may reclaim them. | |
161 | */ | |
76be8950 | 162 | #define MIN_PARTIAL 5 |
e95eed57 | 163 | |
2086d26a CL |
164 | /* |
165 | * Maximum number of desirable partial slabs. | |
166 | * The existence of more partial slabs makes kmem_cache_shrink | |
721ae22a | 167 | * sort the partial list by the number of objects in use. |
2086d26a CL |
168 | */ |
169 | #define MAX_PARTIAL 10 | |
170 | ||
becfda68 | 171 | #define DEBUG_DEFAULT_FLAGS (SLAB_CONSISTENCY_CHECKS | SLAB_RED_ZONE | \ |
81819f0f | 172 | SLAB_POISON | SLAB_STORE_USER) |
672bba3a | 173 | |
149daaf3 LA |
174 | /* |
175 | * These debug flags cannot use CMPXCHG because there might be consistency | |
176 | * issues when checking or reading debug information | |
177 | */ | |
178 | #define SLAB_NO_CMPXCHG (SLAB_CONSISTENCY_CHECKS | SLAB_STORE_USER | \ | |
179 | SLAB_TRACE) | |
180 | ||
181 | ||
fa5ec8a1 | 182 | /* |
3de47213 DR |
183 | * Debugging flags that require metadata to be stored in the slab. These get |
184 | * disabled when slub_debug=O is used and a cache's min order increases with | |
185 | * metadata. | |
fa5ec8a1 | 186 | */ |
3de47213 | 187 | #define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
fa5ec8a1 | 188 | |
210b5c06 CG |
189 | #define OO_SHIFT 16 |
190 | #define OO_MASK ((1 << OO_SHIFT) - 1) | |
50d5c41c | 191 | #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */ |
210b5c06 | 192 | |
81819f0f | 193 | /* Internal SLUB flags */ |
f90ec390 | 194 | #define __OBJECT_POISON 0x80000000UL /* Poison object */ |
b789ef51 | 195 | #define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */ |
81819f0f | 196 | |
81819f0f CL |
197 | #ifdef CONFIG_SMP |
198 | static struct notifier_block slab_notifier; | |
199 | #endif | |
200 | ||
02cbc874 CL |
201 | /* |
202 | * Tracking user of a slab. | |
203 | */ | |
d6543e39 | 204 | #define TRACK_ADDRS_COUNT 16 |
02cbc874 | 205 | struct track { |
ce71e27c | 206 | unsigned long addr; /* Called from address */ |
d6543e39 BG |
207 | #ifdef CONFIG_STACKTRACE |
208 | unsigned long addrs[TRACK_ADDRS_COUNT]; /* Called from address */ | |
209 | #endif | |
02cbc874 CL |
210 | int cpu; /* Was running on cpu */ |
211 | int pid; /* Pid context */ | |
212 | unsigned long when; /* When did the operation occur */ | |
213 | }; | |
214 | ||
215 | enum track_item { TRACK_ALLOC, TRACK_FREE }; | |
216 | ||
ab4d5ed5 | 217 | #ifdef CONFIG_SYSFS |
81819f0f CL |
218 | static int sysfs_slab_add(struct kmem_cache *); |
219 | static int sysfs_slab_alias(struct kmem_cache *, const char *); | |
107dab5c | 220 | static void memcg_propagate_slab_attrs(struct kmem_cache *s); |
81819f0f | 221 | #else |
0c710013 CL |
222 | static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } |
223 | static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) | |
224 | { return 0; } | |
107dab5c | 225 | static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { } |
81819f0f CL |
226 | #endif |
227 | ||
4fdccdfb | 228 | static inline void stat(const struct kmem_cache *s, enum stat_item si) |
8ff12cfc CL |
229 | { |
230 | #ifdef CONFIG_SLUB_STATS | |
88da03a6 CL |
231 | /* |
232 | * The rmw is racy on a preemptible kernel but this is acceptable, so | |
233 | * avoid this_cpu_add()'s irq-disable overhead. | |
234 | */ | |
235 | raw_cpu_inc(s->cpu_slab->stat[si]); | |
8ff12cfc CL |
236 | #endif |
237 | } | |
238 | ||
81819f0f CL |
239 | /******************************************************************** |
240 | * Core slab cache functions | |
241 | *******************************************************************/ | |
242 | ||
7656c72b CL |
243 | static inline void *get_freepointer(struct kmem_cache *s, void *object) |
244 | { | |
245 | return *(void **)(object + s->offset); | |
246 | } | |
247 | ||
0ad9500e ED |
248 | static void prefetch_freepointer(const struct kmem_cache *s, void *object) |
249 | { | |
250 | prefetch(object + s->offset); | |
251 | } | |
252 | ||
1393d9a1 CL |
253 | static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) |
254 | { | |
255 | void *p; | |
256 | ||
922d566c JK |
257 | if (!debug_pagealloc_enabled()) |
258 | return get_freepointer(s, object); | |
259 | ||
1393d9a1 | 260 | probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p)); |
1393d9a1 CL |
261 | return p; |
262 | } | |
263 | ||
7656c72b CL |
264 | static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) |
265 | { | |
266 | *(void **)(object + s->offset) = fp; | |
267 | } | |
268 | ||
269 | /* Loop over all objects in a slab */ | |
224a88be | 270 | #define for_each_object(__p, __s, __addr, __objects) \ |
d86bd1be JK |
271 | for (__p = fixup_red_left(__s, __addr); \ |
272 | __p < (__addr) + (__objects) * (__s)->size; \ | |
273 | __p += (__s)->size) | |
7656c72b | 274 | |
54266640 | 275 | #define for_each_object_idx(__p, __idx, __s, __addr, __objects) \ |
d86bd1be JK |
276 | for (__p = fixup_red_left(__s, __addr), __idx = 1; \ |
277 | __idx <= __objects; \ | |
278 | __p += (__s)->size, __idx++) | |
54266640 | 279 | |
7656c72b CL |
280 | /* Determine object index from a given position */ |
281 | static inline int slab_index(void *p, struct kmem_cache *s, void *addr) | |
282 | { | |
283 | return (p - addr) / s->size; | |
284 | } | |
285 | ||
ab9a0f19 LJ |
286 | static inline int order_objects(int order, unsigned long size, int reserved) |
287 | { | |
288 | return ((PAGE_SIZE << order) - reserved) / size; | |
289 | } | |
290 | ||
834f3d11 | 291 | static inline struct kmem_cache_order_objects oo_make(int order, |
ab9a0f19 | 292 | unsigned long size, int reserved) |
834f3d11 CL |
293 | { |
294 | struct kmem_cache_order_objects x = { | |
ab9a0f19 | 295 | (order << OO_SHIFT) + order_objects(order, size, reserved) |
834f3d11 CL |
296 | }; |
297 | ||
298 | return x; | |
299 | } | |
300 | ||
301 | static inline int oo_order(struct kmem_cache_order_objects x) | |
302 | { | |
210b5c06 | 303 | return x.x >> OO_SHIFT; |
834f3d11 CL |
304 | } |
305 | ||
306 | static inline int oo_objects(struct kmem_cache_order_objects x) | |
307 | { | |
210b5c06 | 308 | return x.x & OO_MASK; |
834f3d11 CL |
309 | } |
310 | ||
881db7fb CL |
311 | /* |
312 | * Per slab locking using the pagelock | |
313 | */ | |
314 | static __always_inline void slab_lock(struct page *page) | |
315 | { | |
48c935ad | 316 | VM_BUG_ON_PAGE(PageTail(page), page); |
881db7fb CL |
317 | bit_spin_lock(PG_locked, &page->flags); |
318 | } | |
319 | ||
320 | static __always_inline void slab_unlock(struct page *page) | |
321 | { | |
48c935ad | 322 | VM_BUG_ON_PAGE(PageTail(page), page); |
881db7fb CL |
323 | __bit_spin_unlock(PG_locked, &page->flags); |
324 | } | |
325 | ||
a0320865 DH |
326 | static inline void set_page_slub_counters(struct page *page, unsigned long counters_new) |
327 | { | |
328 | struct page tmp; | |
329 | tmp.counters = counters_new; | |
330 | /* | |
331 | * page->counters can cover frozen/inuse/objects as well | |
0139aa7b JK |
332 | * as page->_refcount. If we assign to ->counters directly |
333 | * we run the risk of losing updates to page->_refcount, so | |
a0320865 DH |
334 | * be careful and only assign to the fields we need. |
335 | */ | |
336 | page->frozen = tmp.frozen; | |
337 | page->inuse = tmp.inuse; | |
338 | page->objects = tmp.objects; | |
339 | } | |
340 | ||
1d07171c CL |
341 | /* Interrupts must be disabled (for the fallback code to work right) */ |
342 | static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page, | |
343 | void *freelist_old, unsigned long counters_old, | |
344 | void *freelist_new, unsigned long counters_new, | |
345 | const char *n) | |
346 | { | |
347 | VM_BUG_ON(!irqs_disabled()); | |
2565409f HC |
348 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
349 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
1d07171c | 350 | if (s->flags & __CMPXCHG_DOUBLE) { |
cdcd6298 | 351 | if (cmpxchg_double(&page->freelist, &page->counters, |
0aa9a13d DC |
352 | freelist_old, counters_old, |
353 | freelist_new, counters_new)) | |
6f6528a1 | 354 | return true; |
1d07171c CL |
355 | } else |
356 | #endif | |
357 | { | |
358 | slab_lock(page); | |
d0e0ac97 CG |
359 | if (page->freelist == freelist_old && |
360 | page->counters == counters_old) { | |
1d07171c | 361 | page->freelist = freelist_new; |
a0320865 | 362 | set_page_slub_counters(page, counters_new); |
1d07171c | 363 | slab_unlock(page); |
6f6528a1 | 364 | return true; |
1d07171c CL |
365 | } |
366 | slab_unlock(page); | |
367 | } | |
368 | ||
369 | cpu_relax(); | |
370 | stat(s, CMPXCHG_DOUBLE_FAIL); | |
371 | ||
372 | #ifdef SLUB_DEBUG_CMPXCHG | |
f9f58285 | 373 | pr_info("%s %s: cmpxchg double redo ", n, s->name); |
1d07171c CL |
374 | #endif |
375 | ||
6f6528a1 | 376 | return false; |
1d07171c CL |
377 | } |
378 | ||
b789ef51 CL |
379 | static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
380 | void *freelist_old, unsigned long counters_old, | |
381 | void *freelist_new, unsigned long counters_new, | |
382 | const char *n) | |
383 | { | |
2565409f HC |
384 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
385 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
b789ef51 | 386 | if (s->flags & __CMPXCHG_DOUBLE) { |
cdcd6298 | 387 | if (cmpxchg_double(&page->freelist, &page->counters, |
0aa9a13d DC |
388 | freelist_old, counters_old, |
389 | freelist_new, counters_new)) | |
6f6528a1 | 390 | return true; |
b789ef51 CL |
391 | } else |
392 | #endif | |
393 | { | |
1d07171c CL |
394 | unsigned long flags; |
395 | ||
396 | local_irq_save(flags); | |
881db7fb | 397 | slab_lock(page); |
d0e0ac97 CG |
398 | if (page->freelist == freelist_old && |
399 | page->counters == counters_old) { | |
b789ef51 | 400 | page->freelist = freelist_new; |
a0320865 | 401 | set_page_slub_counters(page, counters_new); |
881db7fb | 402 | slab_unlock(page); |
1d07171c | 403 | local_irq_restore(flags); |
6f6528a1 | 404 | return true; |
b789ef51 | 405 | } |
881db7fb | 406 | slab_unlock(page); |
1d07171c | 407 | local_irq_restore(flags); |
b789ef51 CL |
408 | } |
409 | ||
410 | cpu_relax(); | |
411 | stat(s, CMPXCHG_DOUBLE_FAIL); | |
412 | ||
413 | #ifdef SLUB_DEBUG_CMPXCHG | |
f9f58285 | 414 | pr_info("%s %s: cmpxchg double redo ", n, s->name); |
b789ef51 CL |
415 | #endif |
416 | ||
6f6528a1 | 417 | return false; |
b789ef51 CL |
418 | } |
419 | ||
41ecc55b | 420 | #ifdef CONFIG_SLUB_DEBUG |
5f80b13a CL |
421 | /* |
422 | * Determine a map of object in use on a page. | |
423 | * | |
881db7fb | 424 | * Node listlock must be held to guarantee that the page does |
5f80b13a CL |
425 | * not vanish from under us. |
426 | */ | |
427 | static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map) | |
428 | { | |
429 | void *p; | |
430 | void *addr = page_address(page); | |
431 | ||
432 | for (p = page->freelist; p; p = get_freepointer(s, p)) | |
433 | set_bit(slab_index(p, s, addr), map); | |
434 | } | |
435 | ||
d86bd1be JK |
436 | static inline int size_from_object(struct kmem_cache *s) |
437 | { | |
438 | if (s->flags & SLAB_RED_ZONE) | |
439 | return s->size - s->red_left_pad; | |
440 | ||
441 | return s->size; | |
442 | } | |
443 | ||
444 | static inline void *restore_red_left(struct kmem_cache *s, void *p) | |
445 | { | |
446 | if (s->flags & SLAB_RED_ZONE) | |
447 | p -= s->red_left_pad; | |
448 | ||
449 | return p; | |
450 | } | |
451 | ||
41ecc55b CL |
452 | /* |
453 | * Debug settings: | |
454 | */ | |
89d3c87e | 455 | #if defined(CONFIG_SLUB_DEBUG_ON) |
f0630fff CL |
456 | static int slub_debug = DEBUG_DEFAULT_FLAGS; |
457 | #else | |
41ecc55b | 458 | static int slub_debug; |
f0630fff | 459 | #endif |
41ecc55b CL |
460 | |
461 | static char *slub_debug_slabs; | |
fa5ec8a1 | 462 | static int disable_higher_order_debug; |
41ecc55b | 463 | |
a79316c6 AR |
464 | /* |
465 | * slub is about to manipulate internal object metadata. This memory lies | |
466 | * outside the range of the allocated object, so accessing it would normally | |
467 | * be reported by kasan as a bounds error. metadata_access_enable() is used | |
468 | * to tell kasan that these accesses are OK. | |
469 | */ | |
470 | static inline void metadata_access_enable(void) | |
471 | { | |
472 | kasan_disable_current(); | |
473 | } | |
474 | ||
475 | static inline void metadata_access_disable(void) | |
476 | { | |
477 | kasan_enable_current(); | |
478 | } | |
479 | ||
81819f0f CL |
480 | /* |
481 | * Object debugging | |
482 | */ | |
d86bd1be JK |
483 | |
484 | /* Verify that a pointer has an address that is valid within a slab page */ | |
485 | static inline int check_valid_pointer(struct kmem_cache *s, | |
486 | struct page *page, void *object) | |
487 | { | |
488 | void *base; | |
489 | ||
490 | if (!object) | |
491 | return 1; | |
492 | ||
493 | base = page_address(page); | |
494 | object = restore_red_left(s, object); | |
495 | if (object < base || object >= base + page->objects * s->size || | |
496 | (object - base) % s->size) { | |
497 | return 0; | |
498 | } | |
499 | ||
500 | return 1; | |
501 | } | |
502 | ||
81819f0f CL |
503 | static void print_section(char *text, u8 *addr, unsigned int length) |
504 | { | |
a79316c6 | 505 | metadata_access_enable(); |
ffc79d28 SAS |
506 | print_hex_dump(KERN_ERR, text, DUMP_PREFIX_ADDRESS, 16, 1, addr, |
507 | length, 1); | |
a79316c6 | 508 | metadata_access_disable(); |
81819f0f CL |
509 | } |
510 | ||
81819f0f CL |
511 | static struct track *get_track(struct kmem_cache *s, void *object, |
512 | enum track_item alloc) | |
513 | { | |
514 | struct track *p; | |
515 | ||
516 | if (s->offset) | |
517 | p = object + s->offset + sizeof(void *); | |
518 | else | |
519 | p = object + s->inuse; | |
520 | ||
521 | return p + alloc; | |
522 | } | |
523 | ||
524 | static void set_track(struct kmem_cache *s, void *object, | |
ce71e27c | 525 | enum track_item alloc, unsigned long addr) |
81819f0f | 526 | { |
1a00df4a | 527 | struct track *p = get_track(s, object, alloc); |
81819f0f | 528 | |
81819f0f | 529 | if (addr) { |
d6543e39 BG |
530 | #ifdef CONFIG_STACKTRACE |
531 | struct stack_trace trace; | |
532 | int i; | |
533 | ||
534 | trace.nr_entries = 0; | |
535 | trace.max_entries = TRACK_ADDRS_COUNT; | |
536 | trace.entries = p->addrs; | |
537 | trace.skip = 3; | |
a79316c6 | 538 | metadata_access_enable(); |
d6543e39 | 539 | save_stack_trace(&trace); |
a79316c6 | 540 | metadata_access_disable(); |
d6543e39 BG |
541 | |
542 | /* See rant in lockdep.c */ | |
543 | if (trace.nr_entries != 0 && | |
544 | trace.entries[trace.nr_entries - 1] == ULONG_MAX) | |
545 | trace.nr_entries--; | |
546 | ||
547 | for (i = trace.nr_entries; i < TRACK_ADDRS_COUNT; i++) | |
548 | p->addrs[i] = 0; | |
549 | #endif | |
81819f0f CL |
550 | p->addr = addr; |
551 | p->cpu = smp_processor_id(); | |
88e4ccf2 | 552 | p->pid = current->pid; |
81819f0f CL |
553 | p->when = jiffies; |
554 | } else | |
555 | memset(p, 0, sizeof(struct track)); | |
556 | } | |
557 | ||
81819f0f CL |
558 | static void init_tracking(struct kmem_cache *s, void *object) |
559 | { | |
24922684 CL |
560 | if (!(s->flags & SLAB_STORE_USER)) |
561 | return; | |
562 | ||
ce71e27c EGM |
563 | set_track(s, object, TRACK_FREE, 0UL); |
564 | set_track(s, object, TRACK_ALLOC, 0UL); | |
81819f0f CL |
565 | } |
566 | ||
567 | static void print_track(const char *s, struct track *t) | |
568 | { | |
569 | if (!t->addr) | |
570 | return; | |
571 | ||
f9f58285 FF |
572 | pr_err("INFO: %s in %pS age=%lu cpu=%u pid=%d\n", |
573 | s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); | |
d6543e39 BG |
574 | #ifdef CONFIG_STACKTRACE |
575 | { | |
576 | int i; | |
577 | for (i = 0; i < TRACK_ADDRS_COUNT; i++) | |
578 | if (t->addrs[i]) | |
f9f58285 | 579 | pr_err("\t%pS\n", (void *)t->addrs[i]); |
d6543e39 BG |
580 | else |
581 | break; | |
582 | } | |
583 | #endif | |
24922684 CL |
584 | } |
585 | ||
586 | static void print_tracking(struct kmem_cache *s, void *object) | |
587 | { | |
588 | if (!(s->flags & SLAB_STORE_USER)) | |
589 | return; | |
590 | ||
591 | print_track("Allocated", get_track(s, object, TRACK_ALLOC)); | |
592 | print_track("Freed", get_track(s, object, TRACK_FREE)); | |
593 | } | |
594 | ||
595 | static void print_page_info(struct page *page) | |
596 | { | |
f9f58285 | 597 | pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n", |
d0e0ac97 | 598 | page, page->objects, page->inuse, page->freelist, page->flags); |
24922684 CL |
599 | |
600 | } | |
601 | ||
602 | static void slab_bug(struct kmem_cache *s, char *fmt, ...) | |
603 | { | |
ecc42fbe | 604 | struct va_format vaf; |
24922684 | 605 | va_list args; |
24922684 CL |
606 | |
607 | va_start(args, fmt); | |
ecc42fbe FF |
608 | vaf.fmt = fmt; |
609 | vaf.va = &args; | |
f9f58285 | 610 | pr_err("=============================================================================\n"); |
ecc42fbe | 611 | pr_err("BUG %s (%s): %pV\n", s->name, print_tainted(), &vaf); |
f9f58285 | 612 | pr_err("-----------------------------------------------------------------------------\n\n"); |
645df230 | 613 | |
373d4d09 | 614 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
ecc42fbe | 615 | va_end(args); |
81819f0f CL |
616 | } |
617 | ||
24922684 CL |
618 | static void slab_fix(struct kmem_cache *s, char *fmt, ...) |
619 | { | |
ecc42fbe | 620 | struct va_format vaf; |
24922684 | 621 | va_list args; |
24922684 CL |
622 | |
623 | va_start(args, fmt); | |
ecc42fbe FF |
624 | vaf.fmt = fmt; |
625 | vaf.va = &args; | |
626 | pr_err("FIX %s: %pV\n", s->name, &vaf); | |
24922684 | 627 | va_end(args); |
24922684 CL |
628 | } |
629 | ||
630 | static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) | |
81819f0f CL |
631 | { |
632 | unsigned int off; /* Offset of last byte */ | |
a973e9dd | 633 | u8 *addr = page_address(page); |
24922684 CL |
634 | |
635 | print_tracking(s, p); | |
636 | ||
637 | print_page_info(page); | |
638 | ||
f9f58285 FF |
639 | pr_err("INFO: Object 0x%p @offset=%tu fp=0x%p\n\n", |
640 | p, p - addr, get_freepointer(s, p)); | |
24922684 | 641 | |
d86bd1be JK |
642 | if (s->flags & SLAB_RED_ZONE) |
643 | print_section("Redzone ", p - s->red_left_pad, s->red_left_pad); | |
644 | else if (p > addr + 16) | |
ffc79d28 | 645 | print_section("Bytes b4 ", p - 16, 16); |
81819f0f | 646 | |
3b0efdfa | 647 | print_section("Object ", p, min_t(unsigned long, s->object_size, |
ffc79d28 | 648 | PAGE_SIZE)); |
81819f0f | 649 | if (s->flags & SLAB_RED_ZONE) |
3b0efdfa CL |
650 | print_section("Redzone ", p + s->object_size, |
651 | s->inuse - s->object_size); | |
81819f0f | 652 | |
81819f0f CL |
653 | if (s->offset) |
654 | off = s->offset + sizeof(void *); | |
655 | else | |
656 | off = s->inuse; | |
657 | ||
24922684 | 658 | if (s->flags & SLAB_STORE_USER) |
81819f0f | 659 | off += 2 * sizeof(struct track); |
81819f0f | 660 | |
80a9201a AP |
661 | off += kasan_metadata_size(s); |
662 | ||
d86bd1be | 663 | if (off != size_from_object(s)) |
81819f0f | 664 | /* Beginning of the filler is the free pointer */ |
d86bd1be | 665 | print_section("Padding ", p + off, size_from_object(s) - off); |
24922684 CL |
666 | |
667 | dump_stack(); | |
81819f0f CL |
668 | } |
669 | ||
75c66def | 670 | void object_err(struct kmem_cache *s, struct page *page, |
81819f0f CL |
671 | u8 *object, char *reason) |
672 | { | |
3dc50637 | 673 | slab_bug(s, "%s", reason); |
24922684 | 674 | print_trailer(s, page, object); |
81819f0f CL |
675 | } |
676 | ||
d0e0ac97 CG |
677 | static void slab_err(struct kmem_cache *s, struct page *page, |
678 | const char *fmt, ...) | |
81819f0f CL |
679 | { |
680 | va_list args; | |
681 | char buf[100]; | |
682 | ||
24922684 CL |
683 | va_start(args, fmt); |
684 | vsnprintf(buf, sizeof(buf), fmt, args); | |
81819f0f | 685 | va_end(args); |
3dc50637 | 686 | slab_bug(s, "%s", buf); |
24922684 | 687 | print_page_info(page); |
81819f0f CL |
688 | dump_stack(); |
689 | } | |
690 | ||
f7cb1933 | 691 | static void init_object(struct kmem_cache *s, void *object, u8 val) |
81819f0f CL |
692 | { |
693 | u8 *p = object; | |
694 | ||
d86bd1be JK |
695 | if (s->flags & SLAB_RED_ZONE) |
696 | memset(p - s->red_left_pad, val, s->red_left_pad); | |
697 | ||
81819f0f | 698 | if (s->flags & __OBJECT_POISON) { |
3b0efdfa CL |
699 | memset(p, POISON_FREE, s->object_size - 1); |
700 | p[s->object_size - 1] = POISON_END; | |
81819f0f CL |
701 | } |
702 | ||
703 | if (s->flags & SLAB_RED_ZONE) | |
3b0efdfa | 704 | memset(p + s->object_size, val, s->inuse - s->object_size); |
81819f0f CL |
705 | } |
706 | ||
24922684 CL |
707 | static void restore_bytes(struct kmem_cache *s, char *message, u8 data, |
708 | void *from, void *to) | |
709 | { | |
710 | slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data); | |
711 | memset(from, data, to - from); | |
712 | } | |
713 | ||
714 | static int check_bytes_and_report(struct kmem_cache *s, struct page *page, | |
715 | u8 *object, char *what, | |
06428780 | 716 | u8 *start, unsigned int value, unsigned int bytes) |
24922684 CL |
717 | { |
718 | u8 *fault; | |
719 | u8 *end; | |
720 | ||
a79316c6 | 721 | metadata_access_enable(); |
79824820 | 722 | fault = memchr_inv(start, value, bytes); |
a79316c6 | 723 | metadata_access_disable(); |
24922684 CL |
724 | if (!fault) |
725 | return 1; | |
726 | ||
727 | end = start + bytes; | |
728 | while (end > fault && end[-1] == value) | |
729 | end--; | |
730 | ||
731 | slab_bug(s, "%s overwritten", what); | |
f9f58285 | 732 | pr_err("INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n", |
24922684 CL |
733 | fault, end - 1, fault[0], value); |
734 | print_trailer(s, page, object); | |
735 | ||
736 | restore_bytes(s, what, value, fault, end); | |
737 | return 0; | |
81819f0f CL |
738 | } |
739 | ||
81819f0f CL |
740 | /* |
741 | * Object layout: | |
742 | * | |
743 | * object address | |
744 | * Bytes of the object to be managed. | |
745 | * If the freepointer may overlay the object then the free | |
746 | * pointer is the first word of the object. | |
672bba3a | 747 | * |
81819f0f CL |
748 | * Poisoning uses 0x6b (POISON_FREE) and the last byte is |
749 | * 0xa5 (POISON_END) | |
750 | * | |
3b0efdfa | 751 | * object + s->object_size |
81819f0f | 752 | * Padding to reach word boundary. This is also used for Redzoning. |
672bba3a | 753 | * Padding is extended by another word if Redzoning is enabled and |
3b0efdfa | 754 | * object_size == inuse. |
672bba3a | 755 | * |
81819f0f CL |
756 | * We fill with 0xbb (RED_INACTIVE) for inactive objects and with |
757 | * 0xcc (RED_ACTIVE) for objects in use. | |
758 | * | |
759 | * object + s->inuse | |
672bba3a CL |
760 | * Meta data starts here. |
761 | * | |
81819f0f CL |
762 | * A. Free pointer (if we cannot overwrite object on free) |
763 | * B. Tracking data for SLAB_STORE_USER | |
672bba3a | 764 | * C. Padding to reach required alignment boundary or at mininum |
6446faa2 | 765 | * one word if debugging is on to be able to detect writes |
672bba3a CL |
766 | * before the word boundary. |
767 | * | |
768 | * Padding is done using 0x5a (POISON_INUSE) | |
81819f0f CL |
769 | * |
770 | * object + s->size | |
672bba3a | 771 | * Nothing is used beyond s->size. |
81819f0f | 772 | * |
3b0efdfa | 773 | * If slabcaches are merged then the object_size and inuse boundaries are mostly |
672bba3a | 774 | * ignored. And therefore no slab options that rely on these boundaries |
81819f0f CL |
775 | * may be used with merged slabcaches. |
776 | */ | |
777 | ||
81819f0f CL |
778 | static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) |
779 | { | |
780 | unsigned long off = s->inuse; /* The end of info */ | |
781 | ||
782 | if (s->offset) | |
783 | /* Freepointer is placed after the object. */ | |
784 | off += sizeof(void *); | |
785 | ||
786 | if (s->flags & SLAB_STORE_USER) | |
787 | /* We also have user information there */ | |
788 | off += 2 * sizeof(struct track); | |
789 | ||
80a9201a AP |
790 | off += kasan_metadata_size(s); |
791 | ||
d86bd1be | 792 | if (size_from_object(s) == off) |
81819f0f CL |
793 | return 1; |
794 | ||
24922684 | 795 | return check_bytes_and_report(s, page, p, "Object padding", |
d86bd1be | 796 | p + off, POISON_INUSE, size_from_object(s) - off); |
81819f0f CL |
797 | } |
798 | ||
39b26464 | 799 | /* Check the pad bytes at the end of a slab page */ |
81819f0f CL |
800 | static int slab_pad_check(struct kmem_cache *s, struct page *page) |
801 | { | |
24922684 CL |
802 | u8 *start; |
803 | u8 *fault; | |
804 | u8 *end; | |
805 | int length; | |
806 | int remainder; | |
81819f0f CL |
807 | |
808 | if (!(s->flags & SLAB_POISON)) | |
809 | return 1; | |
810 | ||
a973e9dd | 811 | start = page_address(page); |
ab9a0f19 | 812 | length = (PAGE_SIZE << compound_order(page)) - s->reserved; |
39b26464 CL |
813 | end = start + length; |
814 | remainder = length % s->size; | |
81819f0f CL |
815 | if (!remainder) |
816 | return 1; | |
817 | ||
a79316c6 | 818 | metadata_access_enable(); |
79824820 | 819 | fault = memchr_inv(end - remainder, POISON_INUSE, remainder); |
a79316c6 | 820 | metadata_access_disable(); |
24922684 CL |
821 | if (!fault) |
822 | return 1; | |
823 | while (end > fault && end[-1] == POISON_INUSE) | |
824 | end--; | |
825 | ||
826 | slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1); | |
ffc79d28 | 827 | print_section("Padding ", end - remainder, remainder); |
24922684 | 828 | |
8a3d271d | 829 | restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end); |
24922684 | 830 | return 0; |
81819f0f CL |
831 | } |
832 | ||
833 | static int check_object(struct kmem_cache *s, struct page *page, | |
f7cb1933 | 834 | void *object, u8 val) |
81819f0f CL |
835 | { |
836 | u8 *p = object; | |
3b0efdfa | 837 | u8 *endobject = object + s->object_size; |
81819f0f CL |
838 | |
839 | if (s->flags & SLAB_RED_ZONE) { | |
d86bd1be JK |
840 | if (!check_bytes_and_report(s, page, object, "Redzone", |
841 | object - s->red_left_pad, val, s->red_left_pad)) | |
842 | return 0; | |
843 | ||
24922684 | 844 | if (!check_bytes_and_report(s, page, object, "Redzone", |
3b0efdfa | 845 | endobject, val, s->inuse - s->object_size)) |
81819f0f | 846 | return 0; |
81819f0f | 847 | } else { |
3b0efdfa | 848 | if ((s->flags & SLAB_POISON) && s->object_size < s->inuse) { |
3adbefee | 849 | check_bytes_and_report(s, page, p, "Alignment padding", |
d0e0ac97 CG |
850 | endobject, POISON_INUSE, |
851 | s->inuse - s->object_size); | |
3adbefee | 852 | } |
81819f0f CL |
853 | } |
854 | ||
855 | if (s->flags & SLAB_POISON) { | |
f7cb1933 | 856 | if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) && |
24922684 | 857 | (!check_bytes_and_report(s, page, p, "Poison", p, |
3b0efdfa | 858 | POISON_FREE, s->object_size - 1) || |
24922684 | 859 | !check_bytes_and_report(s, page, p, "Poison", |
3b0efdfa | 860 | p + s->object_size - 1, POISON_END, 1))) |
81819f0f | 861 | return 0; |
81819f0f CL |
862 | /* |
863 | * check_pad_bytes cleans up on its own. | |
864 | */ | |
865 | check_pad_bytes(s, page, p); | |
866 | } | |
867 | ||
f7cb1933 | 868 | if (!s->offset && val == SLUB_RED_ACTIVE) |
81819f0f CL |
869 | /* |
870 | * Object and freepointer overlap. Cannot check | |
871 | * freepointer while object is allocated. | |
872 | */ | |
873 | return 1; | |
874 | ||
875 | /* Check free pointer validity */ | |
876 | if (!check_valid_pointer(s, page, get_freepointer(s, p))) { | |
877 | object_err(s, page, p, "Freepointer corrupt"); | |
878 | /* | |
9f6c708e | 879 | * No choice but to zap it and thus lose the remainder |
81819f0f | 880 | * of the free objects in this slab. May cause |
672bba3a | 881 | * another error because the object count is now wrong. |
81819f0f | 882 | */ |
a973e9dd | 883 | set_freepointer(s, p, NULL); |
81819f0f CL |
884 | return 0; |
885 | } | |
886 | return 1; | |
887 | } | |
888 | ||
889 | static int check_slab(struct kmem_cache *s, struct page *page) | |
890 | { | |
39b26464 CL |
891 | int maxobj; |
892 | ||
81819f0f CL |
893 | VM_BUG_ON(!irqs_disabled()); |
894 | ||
895 | if (!PageSlab(page)) { | |
24922684 | 896 | slab_err(s, page, "Not a valid slab page"); |
81819f0f CL |
897 | return 0; |
898 | } | |
39b26464 | 899 | |
ab9a0f19 | 900 | maxobj = order_objects(compound_order(page), s->size, s->reserved); |
39b26464 CL |
901 | if (page->objects > maxobj) { |
902 | slab_err(s, page, "objects %u > max %u", | |
f6edde9c | 903 | page->objects, maxobj); |
39b26464 CL |
904 | return 0; |
905 | } | |
906 | if (page->inuse > page->objects) { | |
24922684 | 907 | slab_err(s, page, "inuse %u > max %u", |
f6edde9c | 908 | page->inuse, page->objects); |
81819f0f CL |
909 | return 0; |
910 | } | |
911 | /* Slab_pad_check fixes things up after itself */ | |
912 | slab_pad_check(s, page); | |
913 | return 1; | |
914 | } | |
915 | ||
916 | /* | |
672bba3a CL |
917 | * Determine if a certain object on a page is on the freelist. Must hold the |
918 | * slab lock to guarantee that the chains are in a consistent state. | |
81819f0f CL |
919 | */ |
920 | static int on_freelist(struct kmem_cache *s, struct page *page, void *search) | |
921 | { | |
922 | int nr = 0; | |
881db7fb | 923 | void *fp; |
81819f0f | 924 | void *object = NULL; |
f6edde9c | 925 | int max_objects; |
81819f0f | 926 | |
881db7fb | 927 | fp = page->freelist; |
39b26464 | 928 | while (fp && nr <= page->objects) { |
81819f0f CL |
929 | if (fp == search) |
930 | return 1; | |
931 | if (!check_valid_pointer(s, page, fp)) { | |
932 | if (object) { | |
933 | object_err(s, page, object, | |
934 | "Freechain corrupt"); | |
a973e9dd | 935 | set_freepointer(s, object, NULL); |
81819f0f | 936 | } else { |
24922684 | 937 | slab_err(s, page, "Freepointer corrupt"); |
a973e9dd | 938 | page->freelist = NULL; |
39b26464 | 939 | page->inuse = page->objects; |
24922684 | 940 | slab_fix(s, "Freelist cleared"); |
81819f0f CL |
941 | return 0; |
942 | } | |
943 | break; | |
944 | } | |
945 | object = fp; | |
946 | fp = get_freepointer(s, object); | |
947 | nr++; | |
948 | } | |
949 | ||
ab9a0f19 | 950 | max_objects = order_objects(compound_order(page), s->size, s->reserved); |
210b5c06 CG |
951 | if (max_objects > MAX_OBJS_PER_PAGE) |
952 | max_objects = MAX_OBJS_PER_PAGE; | |
224a88be CL |
953 | |
954 | if (page->objects != max_objects) { | |
756a025f JP |
955 | slab_err(s, page, "Wrong number of objects. Found %d but should be %d", |
956 | page->objects, max_objects); | |
224a88be CL |
957 | page->objects = max_objects; |
958 | slab_fix(s, "Number of objects adjusted."); | |
959 | } | |
39b26464 | 960 | if (page->inuse != page->objects - nr) { |
756a025f JP |
961 | slab_err(s, page, "Wrong object count. Counter is %d but counted were %d", |
962 | page->inuse, page->objects - nr); | |
39b26464 | 963 | page->inuse = page->objects - nr; |
24922684 | 964 | slab_fix(s, "Object count adjusted."); |
81819f0f CL |
965 | } |
966 | return search == NULL; | |
967 | } | |
968 | ||
0121c619 CL |
969 | static void trace(struct kmem_cache *s, struct page *page, void *object, |
970 | int alloc) | |
3ec09742 CL |
971 | { |
972 | if (s->flags & SLAB_TRACE) { | |
f9f58285 | 973 | pr_info("TRACE %s %s 0x%p inuse=%d fp=0x%p\n", |
3ec09742 CL |
974 | s->name, |
975 | alloc ? "alloc" : "free", | |
976 | object, page->inuse, | |
977 | page->freelist); | |
978 | ||
979 | if (!alloc) | |
d0e0ac97 CG |
980 | print_section("Object ", (void *)object, |
981 | s->object_size); | |
3ec09742 CL |
982 | |
983 | dump_stack(); | |
984 | } | |
985 | } | |
986 | ||
643b1138 | 987 | /* |
672bba3a | 988 | * Tracking of fully allocated slabs for debugging purposes. |
643b1138 | 989 | */ |
5cc6eee8 CL |
990 | static void add_full(struct kmem_cache *s, |
991 | struct kmem_cache_node *n, struct page *page) | |
643b1138 | 992 | { |
5cc6eee8 CL |
993 | if (!(s->flags & SLAB_STORE_USER)) |
994 | return; | |
995 | ||
255d0884 | 996 | lockdep_assert_held(&n->list_lock); |
643b1138 | 997 | list_add(&page->lru, &n->full); |
643b1138 CL |
998 | } |
999 | ||
c65c1877 | 1000 | static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page) |
643b1138 | 1001 | { |
643b1138 CL |
1002 | if (!(s->flags & SLAB_STORE_USER)) |
1003 | return; | |
1004 | ||
255d0884 | 1005 | lockdep_assert_held(&n->list_lock); |
643b1138 | 1006 | list_del(&page->lru); |
643b1138 CL |
1007 | } |
1008 | ||
0f389ec6 CL |
1009 | /* Tracking of the number of slabs for debugging purposes */ |
1010 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) | |
1011 | { | |
1012 | struct kmem_cache_node *n = get_node(s, node); | |
1013 | ||
1014 | return atomic_long_read(&n->nr_slabs); | |
1015 | } | |
1016 | ||
26c02cf0 AB |
1017 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
1018 | { | |
1019 | return atomic_long_read(&n->nr_slabs); | |
1020 | } | |
1021 | ||
205ab99d | 1022 | static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects) |
0f389ec6 CL |
1023 | { |
1024 | struct kmem_cache_node *n = get_node(s, node); | |
1025 | ||
1026 | /* | |
1027 | * May be called early in order to allocate a slab for the | |
1028 | * kmem_cache_node structure. Solve the chicken-egg | |
1029 | * dilemma by deferring the increment of the count during | |
1030 | * bootstrap (see early_kmem_cache_node_alloc). | |
1031 | */ | |
338b2642 | 1032 | if (likely(n)) { |
0f389ec6 | 1033 | atomic_long_inc(&n->nr_slabs); |
205ab99d CL |
1034 | atomic_long_add(objects, &n->total_objects); |
1035 | } | |
0f389ec6 | 1036 | } |
205ab99d | 1037 | static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects) |
0f389ec6 CL |
1038 | { |
1039 | struct kmem_cache_node *n = get_node(s, node); | |
1040 | ||
1041 | atomic_long_dec(&n->nr_slabs); | |
205ab99d | 1042 | atomic_long_sub(objects, &n->total_objects); |
0f389ec6 CL |
1043 | } |
1044 | ||
1045 | /* Object debug checks for alloc/free paths */ | |
3ec09742 CL |
1046 | static void setup_object_debug(struct kmem_cache *s, struct page *page, |
1047 | void *object) | |
1048 | { | |
1049 | if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON))) | |
1050 | return; | |
1051 | ||
f7cb1933 | 1052 | init_object(s, object, SLUB_RED_INACTIVE); |
3ec09742 CL |
1053 | init_tracking(s, object); |
1054 | } | |
1055 | ||
becfda68 | 1056 | static inline int alloc_consistency_checks(struct kmem_cache *s, |
d0e0ac97 | 1057 | struct page *page, |
ce71e27c | 1058 | void *object, unsigned long addr) |
81819f0f CL |
1059 | { |
1060 | if (!check_slab(s, page)) | |
becfda68 | 1061 | return 0; |
81819f0f | 1062 | |
81819f0f CL |
1063 | if (!check_valid_pointer(s, page, object)) { |
1064 | object_err(s, page, object, "Freelist Pointer check fails"); | |
becfda68 | 1065 | return 0; |
81819f0f CL |
1066 | } |
1067 | ||
f7cb1933 | 1068 | if (!check_object(s, page, object, SLUB_RED_INACTIVE)) |
becfda68 LA |
1069 | return 0; |
1070 | ||
1071 | return 1; | |
1072 | } | |
1073 | ||
1074 | static noinline int alloc_debug_processing(struct kmem_cache *s, | |
1075 | struct page *page, | |
1076 | void *object, unsigned long addr) | |
1077 | { | |
1078 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { | |
1079 | if (!alloc_consistency_checks(s, page, object, addr)) | |
1080 | goto bad; | |
1081 | } | |
81819f0f | 1082 | |
3ec09742 CL |
1083 | /* Success perform special debug activities for allocs */ |
1084 | if (s->flags & SLAB_STORE_USER) | |
1085 | set_track(s, object, TRACK_ALLOC, addr); | |
1086 | trace(s, page, object, 1); | |
f7cb1933 | 1087 | init_object(s, object, SLUB_RED_ACTIVE); |
81819f0f | 1088 | return 1; |
3ec09742 | 1089 | |
81819f0f CL |
1090 | bad: |
1091 | if (PageSlab(page)) { | |
1092 | /* | |
1093 | * If this is a slab page then lets do the best we can | |
1094 | * to avoid issues in the future. Marking all objects | |
672bba3a | 1095 | * as used avoids touching the remaining objects. |
81819f0f | 1096 | */ |
24922684 | 1097 | slab_fix(s, "Marking all objects used"); |
39b26464 | 1098 | page->inuse = page->objects; |
a973e9dd | 1099 | page->freelist = NULL; |
81819f0f CL |
1100 | } |
1101 | return 0; | |
1102 | } | |
1103 | ||
becfda68 LA |
1104 | static inline int free_consistency_checks(struct kmem_cache *s, |
1105 | struct page *page, void *object, unsigned long addr) | |
81819f0f | 1106 | { |
81819f0f | 1107 | if (!check_valid_pointer(s, page, object)) { |
70d71228 | 1108 | slab_err(s, page, "Invalid object pointer 0x%p", object); |
becfda68 | 1109 | return 0; |
81819f0f CL |
1110 | } |
1111 | ||
1112 | if (on_freelist(s, page, object)) { | |
24922684 | 1113 | object_err(s, page, object, "Object already free"); |
becfda68 | 1114 | return 0; |
81819f0f CL |
1115 | } |
1116 | ||
f7cb1933 | 1117 | if (!check_object(s, page, object, SLUB_RED_ACTIVE)) |
becfda68 | 1118 | return 0; |
81819f0f | 1119 | |
1b4f59e3 | 1120 | if (unlikely(s != page->slab_cache)) { |
3adbefee | 1121 | if (!PageSlab(page)) { |
756a025f JP |
1122 | slab_err(s, page, "Attempt to free object(0x%p) outside of slab", |
1123 | object); | |
1b4f59e3 | 1124 | } else if (!page->slab_cache) { |
f9f58285 FF |
1125 | pr_err("SLUB <none>: no slab for object 0x%p.\n", |
1126 | object); | |
70d71228 | 1127 | dump_stack(); |
06428780 | 1128 | } else |
24922684 CL |
1129 | object_err(s, page, object, |
1130 | "page slab pointer corrupt."); | |
becfda68 LA |
1131 | return 0; |
1132 | } | |
1133 | return 1; | |
1134 | } | |
1135 | ||
1136 | /* Supports checking bulk free of a constructed freelist */ | |
1137 | static noinline int free_debug_processing( | |
1138 | struct kmem_cache *s, struct page *page, | |
1139 | void *head, void *tail, int bulk_cnt, | |
1140 | unsigned long addr) | |
1141 | { | |
1142 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); | |
1143 | void *object = head; | |
1144 | int cnt = 0; | |
1145 | unsigned long uninitialized_var(flags); | |
1146 | int ret = 0; | |
1147 | ||
1148 | spin_lock_irqsave(&n->list_lock, flags); | |
1149 | slab_lock(page); | |
1150 | ||
1151 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { | |
1152 | if (!check_slab(s, page)) | |
1153 | goto out; | |
1154 | } | |
1155 | ||
1156 | next_object: | |
1157 | cnt++; | |
1158 | ||
1159 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { | |
1160 | if (!free_consistency_checks(s, page, object, addr)) | |
1161 | goto out; | |
81819f0f | 1162 | } |
3ec09742 | 1163 | |
3ec09742 CL |
1164 | if (s->flags & SLAB_STORE_USER) |
1165 | set_track(s, object, TRACK_FREE, addr); | |
1166 | trace(s, page, object, 0); | |
81084651 | 1167 | /* Freepointer not overwritten by init_object(), SLAB_POISON moved it */ |
f7cb1933 | 1168 | init_object(s, object, SLUB_RED_INACTIVE); |
81084651 JDB |
1169 | |
1170 | /* Reached end of constructed freelist yet? */ | |
1171 | if (object != tail) { | |
1172 | object = get_freepointer(s, object); | |
1173 | goto next_object; | |
1174 | } | |
804aa132 LA |
1175 | ret = 1; |
1176 | ||
5c2e4bbb | 1177 | out: |
81084651 JDB |
1178 | if (cnt != bulk_cnt) |
1179 | slab_err(s, page, "Bulk freelist count(%d) invalid(%d)\n", | |
1180 | bulk_cnt, cnt); | |
1181 | ||
881db7fb | 1182 | slab_unlock(page); |
282acb43 | 1183 | spin_unlock_irqrestore(&n->list_lock, flags); |
804aa132 LA |
1184 | if (!ret) |
1185 | slab_fix(s, "Object at 0x%p not freed", object); | |
1186 | return ret; | |
81819f0f CL |
1187 | } |
1188 | ||
41ecc55b CL |
1189 | static int __init setup_slub_debug(char *str) |
1190 | { | |
f0630fff CL |
1191 | slub_debug = DEBUG_DEFAULT_FLAGS; |
1192 | if (*str++ != '=' || !*str) | |
1193 | /* | |
1194 | * No options specified. Switch on full debugging. | |
1195 | */ | |
1196 | goto out; | |
1197 | ||
1198 | if (*str == ',') | |
1199 | /* | |
1200 | * No options but restriction on slabs. This means full | |
1201 | * debugging for slabs matching a pattern. | |
1202 | */ | |
1203 | goto check_slabs; | |
1204 | ||
1205 | slub_debug = 0; | |
1206 | if (*str == '-') | |
1207 | /* | |
1208 | * Switch off all debugging measures. | |
1209 | */ | |
1210 | goto out; | |
1211 | ||
1212 | /* | |
1213 | * Determine which debug features should be switched on | |
1214 | */ | |
06428780 | 1215 | for (; *str && *str != ','; str++) { |
f0630fff CL |
1216 | switch (tolower(*str)) { |
1217 | case 'f': | |
becfda68 | 1218 | slub_debug |= SLAB_CONSISTENCY_CHECKS; |
f0630fff CL |
1219 | break; |
1220 | case 'z': | |
1221 | slub_debug |= SLAB_RED_ZONE; | |
1222 | break; | |
1223 | case 'p': | |
1224 | slub_debug |= SLAB_POISON; | |
1225 | break; | |
1226 | case 'u': | |
1227 | slub_debug |= SLAB_STORE_USER; | |
1228 | break; | |
1229 | case 't': | |
1230 | slub_debug |= SLAB_TRACE; | |
1231 | break; | |
4c13dd3b DM |
1232 | case 'a': |
1233 | slub_debug |= SLAB_FAILSLAB; | |
1234 | break; | |
08303a73 CA |
1235 | case 'o': |
1236 | /* | |
1237 | * Avoid enabling debugging on caches if its minimum | |
1238 | * order would increase as a result. | |
1239 | */ | |
1240 | disable_higher_order_debug = 1; | |
1241 | break; | |
f0630fff | 1242 | default: |
f9f58285 FF |
1243 | pr_err("slub_debug option '%c' unknown. skipped\n", |
1244 | *str); | |
f0630fff | 1245 | } |
41ecc55b CL |
1246 | } |
1247 | ||
f0630fff | 1248 | check_slabs: |
41ecc55b CL |
1249 | if (*str == ',') |
1250 | slub_debug_slabs = str + 1; | |
f0630fff | 1251 | out: |
41ecc55b CL |
1252 | return 1; |
1253 | } | |
1254 | ||
1255 | __setup("slub_debug", setup_slub_debug); | |
1256 | ||
423c929c | 1257 | unsigned long kmem_cache_flags(unsigned long object_size, |
ba0268a8 | 1258 | unsigned long flags, const char *name, |
51cc5068 | 1259 | void (*ctor)(void *)) |
41ecc55b CL |
1260 | { |
1261 | /* | |
e153362a | 1262 | * Enable debugging if selected on the kernel commandline. |
41ecc55b | 1263 | */ |
c6f58d9b CL |
1264 | if (slub_debug && (!slub_debug_slabs || (name && |
1265 | !strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs))))) | |
3de47213 | 1266 | flags |= slub_debug; |
ba0268a8 CL |
1267 | |
1268 | return flags; | |
41ecc55b | 1269 | } |
b4a64718 | 1270 | #else /* !CONFIG_SLUB_DEBUG */ |
3ec09742 CL |
1271 | static inline void setup_object_debug(struct kmem_cache *s, |
1272 | struct page *page, void *object) {} | |
41ecc55b | 1273 | |
3ec09742 | 1274 | static inline int alloc_debug_processing(struct kmem_cache *s, |
ce71e27c | 1275 | struct page *page, void *object, unsigned long addr) { return 0; } |
41ecc55b | 1276 | |
282acb43 | 1277 | static inline int free_debug_processing( |
81084651 JDB |
1278 | struct kmem_cache *s, struct page *page, |
1279 | void *head, void *tail, int bulk_cnt, | |
282acb43 | 1280 | unsigned long addr) { return 0; } |
41ecc55b | 1281 | |
41ecc55b CL |
1282 | static inline int slab_pad_check(struct kmem_cache *s, struct page *page) |
1283 | { return 1; } | |
1284 | static inline int check_object(struct kmem_cache *s, struct page *page, | |
f7cb1933 | 1285 | void *object, u8 val) { return 1; } |
5cc6eee8 CL |
1286 | static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, |
1287 | struct page *page) {} | |
c65c1877 PZ |
1288 | static inline void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, |
1289 | struct page *page) {} | |
423c929c | 1290 | unsigned long kmem_cache_flags(unsigned long object_size, |
ba0268a8 | 1291 | unsigned long flags, const char *name, |
51cc5068 | 1292 | void (*ctor)(void *)) |
ba0268a8 CL |
1293 | { |
1294 | return flags; | |
1295 | } | |
41ecc55b | 1296 | #define slub_debug 0 |
0f389ec6 | 1297 | |
fdaa45e9 IM |
1298 | #define disable_higher_order_debug 0 |
1299 | ||
0f389ec6 CL |
1300 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
1301 | { return 0; } | |
26c02cf0 AB |
1302 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
1303 | { return 0; } | |
205ab99d CL |
1304 | static inline void inc_slabs_node(struct kmem_cache *s, int node, |
1305 | int objects) {} | |
1306 | static inline void dec_slabs_node(struct kmem_cache *s, int node, | |
1307 | int objects) {} | |
7d550c56 | 1308 | |
02e72cc6 AR |
1309 | #endif /* CONFIG_SLUB_DEBUG */ |
1310 | ||
1311 | /* | |
1312 | * Hooks for other subsystems that check memory allocations. In a typical | |
1313 | * production configuration these hooks all should produce no code at all. | |
1314 | */ | |
d56791b3 RB |
1315 | static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) |
1316 | { | |
1317 | kmemleak_alloc(ptr, size, 1, flags); | |
505f5dcb | 1318 | kasan_kmalloc_large(ptr, size, flags); |
d56791b3 RB |
1319 | } |
1320 | ||
1321 | static inline void kfree_hook(const void *x) | |
1322 | { | |
1323 | kmemleak_free(x); | |
0316bec2 | 1324 | kasan_kfree_large(x); |
d56791b3 RB |
1325 | } |
1326 | ||
80a9201a | 1327 | static inline void *slab_free_hook(struct kmem_cache *s, void *x) |
d56791b3 | 1328 | { |
80a9201a AP |
1329 | void *freeptr; |
1330 | ||
d56791b3 | 1331 | kmemleak_free_recursive(x, s->flags); |
7d550c56 | 1332 | |
02e72cc6 AR |
1333 | /* |
1334 | * Trouble is that we may no longer disable interrupts in the fast path | |
1335 | * So in order to make the debug calls that expect irqs to be | |
1336 | * disabled we need to disable interrupts temporarily. | |
1337 | */ | |
1338 | #if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP) | |
1339 | { | |
1340 | unsigned long flags; | |
1341 | ||
1342 | local_irq_save(flags); | |
1343 | kmemcheck_slab_free(s, x, s->object_size); | |
1344 | debug_check_no_locks_freed(x, s->object_size); | |
1345 | local_irq_restore(flags); | |
1346 | } | |
1347 | #endif | |
1348 | if (!(s->flags & SLAB_DEBUG_OBJECTS)) | |
1349 | debug_check_no_obj_freed(x, s->object_size); | |
0316bec2 | 1350 | |
80a9201a AP |
1351 | freeptr = get_freepointer(s, x); |
1352 | /* | |
1353 | * kasan_slab_free() may put x into memory quarantine, delaying its | |
1354 | * reuse. In this case the object's freelist pointer is changed. | |
1355 | */ | |
0316bec2 | 1356 | kasan_slab_free(s, x); |
80a9201a | 1357 | return freeptr; |
02e72cc6 | 1358 | } |
205ab99d | 1359 | |
81084651 JDB |
1360 | static inline void slab_free_freelist_hook(struct kmem_cache *s, |
1361 | void *head, void *tail) | |
1362 | { | |
1363 | /* | |
1364 | * Compiler cannot detect this function can be removed if slab_free_hook() | |
1365 | * evaluates to nothing. Thus, catch all relevant config debug options here. | |
1366 | */ | |
1367 | #if defined(CONFIG_KMEMCHECK) || \ | |
1368 | defined(CONFIG_LOCKDEP) || \ | |
1369 | defined(CONFIG_DEBUG_KMEMLEAK) || \ | |
1370 | defined(CONFIG_DEBUG_OBJECTS_FREE) || \ | |
1371 | defined(CONFIG_KASAN) | |
1372 | ||
1373 | void *object = head; | |
1374 | void *tail_obj = tail ? : head; | |
80a9201a | 1375 | void *freeptr; |
81084651 JDB |
1376 | |
1377 | do { | |
80a9201a AP |
1378 | freeptr = slab_free_hook(s, object); |
1379 | } while ((object != tail_obj) && (object = freeptr)); | |
81084651 JDB |
1380 | #endif |
1381 | } | |
1382 | ||
588f8ba9 TG |
1383 | static void setup_object(struct kmem_cache *s, struct page *page, |
1384 | void *object) | |
1385 | { | |
1386 | setup_object_debug(s, page, object); | |
1387 | if (unlikely(s->ctor)) { | |
1388 | kasan_unpoison_object_data(s, object); | |
1389 | s->ctor(object); | |
1390 | kasan_poison_object_data(s, object); | |
1391 | } | |
1392 | } | |
1393 | ||
81819f0f CL |
1394 | /* |
1395 | * Slab allocation and freeing | |
1396 | */ | |
5dfb4175 VD |
1397 | static inline struct page *alloc_slab_page(struct kmem_cache *s, |
1398 | gfp_t flags, int node, struct kmem_cache_order_objects oo) | |
65c3376a | 1399 | { |
5dfb4175 | 1400 | struct page *page; |
65c3376a CL |
1401 | int order = oo_order(oo); |
1402 | ||
b1eeab67 VN |
1403 | flags |= __GFP_NOTRACK; |
1404 | ||
2154a336 | 1405 | if (node == NUMA_NO_NODE) |
5dfb4175 | 1406 | page = alloc_pages(flags, order); |
65c3376a | 1407 | else |
96db800f | 1408 | page = __alloc_pages_node(node, flags, order); |
5dfb4175 | 1409 | |
f3ccb2c4 VD |
1410 | if (page && memcg_charge_slab(page, flags, order, s)) { |
1411 | __free_pages(page, order); | |
1412 | page = NULL; | |
1413 | } | |
5dfb4175 VD |
1414 | |
1415 | return page; | |
65c3376a CL |
1416 | } |
1417 | ||
210e7a43 TG |
1418 | #ifdef CONFIG_SLAB_FREELIST_RANDOM |
1419 | /* Pre-initialize the random sequence cache */ | |
1420 | static int init_cache_random_seq(struct kmem_cache *s) | |
1421 | { | |
1422 | int err; | |
1423 | unsigned long i, count = oo_objects(s->oo); | |
1424 | ||
1425 | err = cache_random_seq_create(s, count, GFP_KERNEL); | |
1426 | if (err) { | |
1427 | pr_err("SLUB: Unable to initialize free list for %s\n", | |
1428 | s->name); | |
1429 | return err; | |
1430 | } | |
1431 | ||
1432 | /* Transform to an offset on the set of pages */ | |
1433 | if (s->random_seq) { | |
1434 | for (i = 0; i < count; i++) | |
1435 | s->random_seq[i] *= s->size; | |
1436 | } | |
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | /* Initialize each random sequence freelist per cache */ | |
1441 | static void __init init_freelist_randomization(void) | |
1442 | { | |
1443 | struct kmem_cache *s; | |
1444 | ||
1445 | mutex_lock(&slab_mutex); | |
1446 | ||
1447 | list_for_each_entry(s, &slab_caches, list) | |
1448 | init_cache_random_seq(s); | |
1449 | ||
1450 | mutex_unlock(&slab_mutex); | |
1451 | } | |
1452 | ||
1453 | /* Get the next entry on the pre-computed freelist randomized */ | |
1454 | static void *next_freelist_entry(struct kmem_cache *s, struct page *page, | |
1455 | unsigned long *pos, void *start, | |
1456 | unsigned long page_limit, | |
1457 | unsigned long freelist_count) | |
1458 | { | |
1459 | unsigned int idx; | |
1460 | ||
1461 | /* | |
1462 | * If the target page allocation failed, the number of objects on the | |
1463 | * page might be smaller than the usual size defined by the cache. | |
1464 | */ | |
1465 | do { | |
1466 | idx = s->random_seq[*pos]; | |
1467 | *pos += 1; | |
1468 | if (*pos >= freelist_count) | |
1469 | *pos = 0; | |
1470 | } while (unlikely(idx >= page_limit)); | |
1471 | ||
1472 | return (char *)start + idx; | |
1473 | } | |
1474 | ||
1475 | /* Shuffle the single linked freelist based on a random pre-computed sequence */ | |
1476 | static bool shuffle_freelist(struct kmem_cache *s, struct page *page) | |
1477 | { | |
1478 | void *start; | |
1479 | void *cur; | |
1480 | void *next; | |
1481 | unsigned long idx, pos, page_limit, freelist_count; | |
1482 | ||
1483 | if (page->objects < 2 || !s->random_seq) | |
1484 | return false; | |
1485 | ||
1486 | freelist_count = oo_objects(s->oo); | |
1487 | pos = get_random_int() % freelist_count; | |
1488 | ||
1489 | page_limit = page->objects * s->size; | |
1490 | start = fixup_red_left(s, page_address(page)); | |
1491 | ||
1492 | /* First entry is used as the base of the freelist */ | |
1493 | cur = next_freelist_entry(s, page, &pos, start, page_limit, | |
1494 | freelist_count); | |
1495 | page->freelist = cur; | |
1496 | ||
1497 | for (idx = 1; idx < page->objects; idx++) { | |
1498 | setup_object(s, page, cur); | |
1499 | next = next_freelist_entry(s, page, &pos, start, page_limit, | |
1500 | freelist_count); | |
1501 | set_freepointer(s, cur, next); | |
1502 | cur = next; | |
1503 | } | |
1504 | setup_object(s, page, cur); | |
1505 | set_freepointer(s, cur, NULL); | |
1506 | ||
1507 | return true; | |
1508 | } | |
1509 | #else | |
1510 | static inline int init_cache_random_seq(struct kmem_cache *s) | |
1511 | { | |
1512 | return 0; | |
1513 | } | |
1514 | static inline void init_freelist_randomization(void) { } | |
1515 | static inline bool shuffle_freelist(struct kmem_cache *s, struct page *page) | |
1516 | { | |
1517 | return false; | |
1518 | } | |
1519 | #endif /* CONFIG_SLAB_FREELIST_RANDOM */ | |
1520 | ||
81819f0f CL |
1521 | static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) |
1522 | { | |
06428780 | 1523 | struct page *page; |
834f3d11 | 1524 | struct kmem_cache_order_objects oo = s->oo; |
ba52270d | 1525 | gfp_t alloc_gfp; |
588f8ba9 TG |
1526 | void *start, *p; |
1527 | int idx, order; | |
210e7a43 | 1528 | bool shuffle; |
81819f0f | 1529 | |
7e0528da CL |
1530 | flags &= gfp_allowed_mask; |
1531 | ||
d0164adc | 1532 | if (gfpflags_allow_blocking(flags)) |
7e0528da CL |
1533 | local_irq_enable(); |
1534 | ||
b7a49f0d | 1535 | flags |= s->allocflags; |
e12ba74d | 1536 | |
ba52270d PE |
1537 | /* |
1538 | * Let the initial higher-order allocation fail under memory pressure | |
1539 | * so we fall-back to the minimum order allocation. | |
1540 | */ | |
1541 | alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; | |
d0164adc | 1542 | if ((alloc_gfp & __GFP_DIRECT_RECLAIM) && oo_order(oo) > oo_order(s->min)) |
444eb2a4 | 1543 | alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~(__GFP_RECLAIM|__GFP_NOFAIL); |
ba52270d | 1544 | |
5dfb4175 | 1545 | page = alloc_slab_page(s, alloc_gfp, node, oo); |
65c3376a CL |
1546 | if (unlikely(!page)) { |
1547 | oo = s->min; | |
80c3a998 | 1548 | alloc_gfp = flags; |
65c3376a CL |
1549 | /* |
1550 | * Allocation may have failed due to fragmentation. | |
1551 | * Try a lower order alloc if possible | |
1552 | */ | |
5dfb4175 | 1553 | page = alloc_slab_page(s, alloc_gfp, node, oo); |
588f8ba9 TG |
1554 | if (unlikely(!page)) |
1555 | goto out; | |
1556 | stat(s, ORDER_FALLBACK); | |
65c3376a | 1557 | } |
5a896d9e | 1558 | |
588f8ba9 TG |
1559 | if (kmemcheck_enabled && |
1560 | !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { | |
b1eeab67 VN |
1561 | int pages = 1 << oo_order(oo); |
1562 | ||
80c3a998 | 1563 | kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node); |
b1eeab67 VN |
1564 | |
1565 | /* | |
1566 | * Objects from caches that have a constructor don't get | |
1567 | * cleared when they're allocated, so we need to do it here. | |
1568 | */ | |
1569 | if (s->ctor) | |
1570 | kmemcheck_mark_uninitialized_pages(page, pages); | |
1571 | else | |
1572 | kmemcheck_mark_unallocated_pages(page, pages); | |
5a896d9e VN |
1573 | } |
1574 | ||
834f3d11 | 1575 | page->objects = oo_objects(oo); |
81819f0f | 1576 | |
1f458cbf | 1577 | order = compound_order(page); |
1b4f59e3 | 1578 | page->slab_cache = s; |
c03f94cc | 1579 | __SetPageSlab(page); |
2f064f34 | 1580 | if (page_is_pfmemalloc(page)) |
072bb0aa | 1581 | SetPageSlabPfmemalloc(page); |
81819f0f CL |
1582 | |
1583 | start = page_address(page); | |
81819f0f CL |
1584 | |
1585 | if (unlikely(s->flags & SLAB_POISON)) | |
1f458cbf | 1586 | memset(start, POISON_INUSE, PAGE_SIZE << order); |
81819f0f | 1587 | |
0316bec2 AR |
1588 | kasan_poison_slab(page); |
1589 | ||
210e7a43 TG |
1590 | shuffle = shuffle_freelist(s, page); |
1591 | ||
1592 | if (!shuffle) { | |
1593 | for_each_object_idx(p, idx, s, start, page->objects) { | |
1594 | setup_object(s, page, p); | |
1595 | if (likely(idx < page->objects)) | |
1596 | set_freepointer(s, p, p + s->size); | |
1597 | else | |
1598 | set_freepointer(s, p, NULL); | |
1599 | } | |
1600 | page->freelist = fixup_red_left(s, start); | |
81819f0f | 1601 | } |
81819f0f | 1602 | |
e6e82ea1 | 1603 | page->inuse = page->objects; |
8cb0a506 | 1604 | page->frozen = 1; |
588f8ba9 | 1605 | |
81819f0f | 1606 | out: |
d0164adc | 1607 | if (gfpflags_allow_blocking(flags)) |
588f8ba9 TG |
1608 | local_irq_disable(); |
1609 | if (!page) | |
1610 | return NULL; | |
1611 | ||
1612 | mod_zone_page_state(page_zone(page), | |
1613 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? | |
1614 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, | |
1615 | 1 << oo_order(oo)); | |
1616 | ||
1617 | inc_slabs_node(s, page_to_nid(page), page->objects); | |
1618 | ||
81819f0f CL |
1619 | return page; |
1620 | } | |
1621 | ||
588f8ba9 TG |
1622 | static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) |
1623 | { | |
1624 | if (unlikely(flags & GFP_SLAB_BUG_MASK)) { | |
bacdcb34 | 1625 | gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK; |
72baeef0 MH |
1626 | flags &= ~GFP_SLAB_BUG_MASK; |
1627 | pr_warn("Unexpected gfp: %#x (%pGg). Fixing up to gfp: %#x (%pGg). Fix your code!\n", | |
1628 | invalid_mask, &invalid_mask, flags, &flags); | |
588f8ba9 TG |
1629 | } |
1630 | ||
1631 | return allocate_slab(s, | |
1632 | flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); | |
1633 | } | |
1634 | ||
81819f0f CL |
1635 | static void __free_slab(struct kmem_cache *s, struct page *page) |
1636 | { | |
834f3d11 CL |
1637 | int order = compound_order(page); |
1638 | int pages = 1 << order; | |
81819f0f | 1639 | |
becfda68 | 1640 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { |
81819f0f CL |
1641 | void *p; |
1642 | ||
1643 | slab_pad_check(s, page); | |
224a88be CL |
1644 | for_each_object(p, s, page_address(page), |
1645 | page->objects) | |
f7cb1933 | 1646 | check_object(s, page, p, SLUB_RED_INACTIVE); |
81819f0f CL |
1647 | } |
1648 | ||
b1eeab67 | 1649 | kmemcheck_free_shadow(page, compound_order(page)); |
5a896d9e | 1650 | |
81819f0f CL |
1651 | mod_zone_page_state(page_zone(page), |
1652 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? | |
1653 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, | |
06428780 | 1654 | -pages); |
81819f0f | 1655 | |
072bb0aa | 1656 | __ClearPageSlabPfmemalloc(page); |
49bd5221 | 1657 | __ClearPageSlab(page); |
1f458cbf | 1658 | |
22b751c3 | 1659 | page_mapcount_reset(page); |
1eb5ac64 NP |
1660 | if (current->reclaim_state) |
1661 | current->reclaim_state->reclaimed_slab += pages; | |
27ee57c9 VD |
1662 | memcg_uncharge_slab(page, order, s); |
1663 | __free_pages(page, order); | |
81819f0f CL |
1664 | } |
1665 | ||
da9a638c LJ |
1666 | #define need_reserve_slab_rcu \ |
1667 | (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)) | |
1668 | ||
81819f0f CL |
1669 | static void rcu_free_slab(struct rcu_head *h) |
1670 | { | |
1671 | struct page *page; | |
1672 | ||
da9a638c LJ |
1673 | if (need_reserve_slab_rcu) |
1674 | page = virt_to_head_page(h); | |
1675 | else | |
1676 | page = container_of((struct list_head *)h, struct page, lru); | |
1677 | ||
1b4f59e3 | 1678 | __free_slab(page->slab_cache, page); |
81819f0f CL |
1679 | } |
1680 | ||
1681 | static void free_slab(struct kmem_cache *s, struct page *page) | |
1682 | { | |
1683 | if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) { | |
da9a638c LJ |
1684 | struct rcu_head *head; |
1685 | ||
1686 | if (need_reserve_slab_rcu) { | |
1687 | int order = compound_order(page); | |
1688 | int offset = (PAGE_SIZE << order) - s->reserved; | |
1689 | ||
1690 | VM_BUG_ON(s->reserved != sizeof(*head)); | |
1691 | head = page_address(page) + offset; | |
1692 | } else { | |
bc4f610d | 1693 | head = &page->rcu_head; |
da9a638c | 1694 | } |
81819f0f CL |
1695 | |
1696 | call_rcu(head, rcu_free_slab); | |
1697 | } else | |
1698 | __free_slab(s, page); | |
1699 | } | |
1700 | ||
1701 | static void discard_slab(struct kmem_cache *s, struct page *page) | |
1702 | { | |
205ab99d | 1703 | dec_slabs_node(s, page_to_nid(page), page->objects); |
81819f0f CL |
1704 | free_slab(s, page); |
1705 | } | |
1706 | ||
1707 | /* | |
5cc6eee8 | 1708 | * Management of partially allocated slabs. |
81819f0f | 1709 | */ |
1e4dd946 SR |
1710 | static inline void |
1711 | __add_partial(struct kmem_cache_node *n, struct page *page, int tail) | |
81819f0f | 1712 | { |
e95eed57 | 1713 | n->nr_partial++; |
136333d1 | 1714 | if (tail == DEACTIVATE_TO_TAIL) |
7c2e132c CL |
1715 | list_add_tail(&page->lru, &n->partial); |
1716 | else | |
1717 | list_add(&page->lru, &n->partial); | |
81819f0f CL |
1718 | } |
1719 | ||
1e4dd946 SR |
1720 | static inline void add_partial(struct kmem_cache_node *n, |
1721 | struct page *page, int tail) | |
62e346a8 | 1722 | { |
c65c1877 | 1723 | lockdep_assert_held(&n->list_lock); |
1e4dd946 SR |
1724 | __add_partial(n, page, tail); |
1725 | } | |
c65c1877 | 1726 | |
1e4dd946 SR |
1727 | static inline void remove_partial(struct kmem_cache_node *n, |
1728 | struct page *page) | |
1729 | { | |
1730 | lockdep_assert_held(&n->list_lock); | |
52b4b950 DS |
1731 | list_del(&page->lru); |
1732 | n->nr_partial--; | |
1e4dd946 SR |
1733 | } |
1734 | ||
81819f0f | 1735 | /* |
7ced3719 CL |
1736 | * Remove slab from the partial list, freeze it and |
1737 | * return the pointer to the freelist. | |
81819f0f | 1738 | * |
497b66f2 | 1739 | * Returns a list of objects or NULL if it fails. |
81819f0f | 1740 | */ |
497b66f2 | 1741 | static inline void *acquire_slab(struct kmem_cache *s, |
acd19fd1 | 1742 | struct kmem_cache_node *n, struct page *page, |
633b0764 | 1743 | int mode, int *objects) |
81819f0f | 1744 | { |
2cfb7455 CL |
1745 | void *freelist; |
1746 | unsigned long counters; | |
1747 | struct page new; | |
1748 | ||
c65c1877 PZ |
1749 | lockdep_assert_held(&n->list_lock); |
1750 | ||
2cfb7455 CL |
1751 | /* |
1752 | * Zap the freelist and set the frozen bit. | |
1753 | * The old freelist is the list of objects for the | |
1754 | * per cpu allocation list. | |
1755 | */ | |
7ced3719 CL |
1756 | freelist = page->freelist; |
1757 | counters = page->counters; | |
1758 | new.counters = counters; | |
633b0764 | 1759 | *objects = new.objects - new.inuse; |
23910c50 | 1760 | if (mode) { |
7ced3719 | 1761 | new.inuse = page->objects; |
23910c50 PE |
1762 | new.freelist = NULL; |
1763 | } else { | |
1764 | new.freelist = freelist; | |
1765 | } | |
2cfb7455 | 1766 | |
a0132ac0 | 1767 | VM_BUG_ON(new.frozen); |
7ced3719 | 1768 | new.frozen = 1; |
2cfb7455 | 1769 | |
7ced3719 | 1770 | if (!__cmpxchg_double_slab(s, page, |
2cfb7455 | 1771 | freelist, counters, |
02d7633f | 1772 | new.freelist, new.counters, |
7ced3719 | 1773 | "acquire_slab")) |
7ced3719 | 1774 | return NULL; |
2cfb7455 CL |
1775 | |
1776 | remove_partial(n, page); | |
7ced3719 | 1777 | WARN_ON(!freelist); |
49e22585 | 1778 | return freelist; |
81819f0f CL |
1779 | } |
1780 | ||
633b0764 | 1781 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain); |
8ba00bb6 | 1782 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags); |
49e22585 | 1783 | |
81819f0f | 1784 | /* |
672bba3a | 1785 | * Try to allocate a partial slab from a specific node. |
81819f0f | 1786 | */ |
8ba00bb6 JK |
1787 | static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, |
1788 | struct kmem_cache_cpu *c, gfp_t flags) | |
81819f0f | 1789 | { |
49e22585 CL |
1790 | struct page *page, *page2; |
1791 | void *object = NULL; | |
633b0764 JK |
1792 | int available = 0; |
1793 | int objects; | |
81819f0f CL |
1794 | |
1795 | /* | |
1796 | * Racy check. If we mistakenly see no partial slabs then we | |
1797 | * just allocate an empty slab. If we mistakenly try to get a | |
672bba3a CL |
1798 | * partial slab and there is none available then get_partials() |
1799 | * will return NULL. | |
81819f0f CL |
1800 | */ |
1801 | if (!n || !n->nr_partial) | |
1802 | return NULL; | |
1803 | ||
1804 | spin_lock(&n->list_lock); | |
49e22585 | 1805 | list_for_each_entry_safe(page, page2, &n->partial, lru) { |
8ba00bb6 | 1806 | void *t; |
49e22585 | 1807 | |
8ba00bb6 JK |
1808 | if (!pfmemalloc_match(page, flags)) |
1809 | continue; | |
1810 | ||
633b0764 | 1811 | t = acquire_slab(s, n, page, object == NULL, &objects); |
49e22585 CL |
1812 | if (!t) |
1813 | break; | |
1814 | ||
633b0764 | 1815 | available += objects; |
12d79634 | 1816 | if (!object) { |
49e22585 | 1817 | c->page = page; |
49e22585 | 1818 | stat(s, ALLOC_FROM_PARTIAL); |
49e22585 | 1819 | object = t; |
49e22585 | 1820 | } else { |
633b0764 | 1821 | put_cpu_partial(s, page, 0); |
8028dcea | 1822 | stat(s, CPU_PARTIAL_NODE); |
49e22585 | 1823 | } |
345c905d JK |
1824 | if (!kmem_cache_has_cpu_partial(s) |
1825 | || available > s->cpu_partial / 2) | |
49e22585 CL |
1826 | break; |
1827 | ||
497b66f2 | 1828 | } |
81819f0f | 1829 | spin_unlock(&n->list_lock); |
497b66f2 | 1830 | return object; |
81819f0f CL |
1831 | } |
1832 | ||
1833 | /* | |
672bba3a | 1834 | * Get a page from somewhere. Search in increasing NUMA distances. |
81819f0f | 1835 | */ |
de3ec035 | 1836 | static void *get_any_partial(struct kmem_cache *s, gfp_t flags, |
acd19fd1 | 1837 | struct kmem_cache_cpu *c) |
81819f0f CL |
1838 | { |
1839 | #ifdef CONFIG_NUMA | |
1840 | struct zonelist *zonelist; | |
dd1a239f | 1841 | struct zoneref *z; |
54a6eb5c MG |
1842 | struct zone *zone; |
1843 | enum zone_type high_zoneidx = gfp_zone(flags); | |
497b66f2 | 1844 | void *object; |
cc9a6c87 | 1845 | unsigned int cpuset_mems_cookie; |
81819f0f CL |
1846 | |
1847 | /* | |
672bba3a CL |
1848 | * The defrag ratio allows a configuration of the tradeoffs between |
1849 | * inter node defragmentation and node local allocations. A lower | |
1850 | * defrag_ratio increases the tendency to do local allocations | |
1851 | * instead of attempting to obtain partial slabs from other nodes. | |
81819f0f | 1852 | * |
672bba3a CL |
1853 | * If the defrag_ratio is set to 0 then kmalloc() always |
1854 | * returns node local objects. If the ratio is higher then kmalloc() | |
1855 | * may return off node objects because partial slabs are obtained | |
1856 | * from other nodes and filled up. | |
81819f0f | 1857 | * |
43efd3ea LP |
1858 | * If /sys/kernel/slab/xx/remote_node_defrag_ratio is set to 100 |
1859 | * (which makes defrag_ratio = 1000) then every (well almost) | |
1860 | * allocation will first attempt to defrag slab caches on other nodes. | |
1861 | * This means scanning over all nodes to look for partial slabs which | |
1862 | * may be expensive if we do it every time we are trying to find a slab | |
672bba3a | 1863 | * with available objects. |
81819f0f | 1864 | */ |
9824601e CL |
1865 | if (!s->remote_node_defrag_ratio || |
1866 | get_cycles() % 1024 > s->remote_node_defrag_ratio) | |
81819f0f CL |
1867 | return NULL; |
1868 | ||
cc9a6c87 | 1869 | do { |
d26914d1 | 1870 | cpuset_mems_cookie = read_mems_allowed_begin(); |
2a389610 | 1871 | zonelist = node_zonelist(mempolicy_slab_node(), flags); |
cc9a6c87 MG |
1872 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
1873 | struct kmem_cache_node *n; | |
1874 | ||
1875 | n = get_node(s, zone_to_nid(zone)); | |
1876 | ||
dee2f8aa | 1877 | if (n && cpuset_zone_allowed(zone, flags) && |
cc9a6c87 | 1878 | n->nr_partial > s->min_partial) { |
8ba00bb6 | 1879 | object = get_partial_node(s, n, c, flags); |
cc9a6c87 MG |
1880 | if (object) { |
1881 | /* | |
d26914d1 MG |
1882 | * Don't check read_mems_allowed_retry() |
1883 | * here - if mems_allowed was updated in | |
1884 | * parallel, that was a harmless race | |
1885 | * between allocation and the cpuset | |
1886 | * update | |
cc9a6c87 | 1887 | */ |
cc9a6c87 MG |
1888 | return object; |
1889 | } | |
c0ff7453 | 1890 | } |
81819f0f | 1891 | } |
d26914d1 | 1892 | } while (read_mems_allowed_retry(cpuset_mems_cookie)); |
81819f0f CL |
1893 | #endif |
1894 | return NULL; | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * Get a partial page, lock it and return it. | |
1899 | */ | |
497b66f2 | 1900 | static void *get_partial(struct kmem_cache *s, gfp_t flags, int node, |
acd19fd1 | 1901 | struct kmem_cache_cpu *c) |
81819f0f | 1902 | { |
497b66f2 | 1903 | void *object; |
a561ce00 JK |
1904 | int searchnode = node; |
1905 | ||
1906 | if (node == NUMA_NO_NODE) | |
1907 | searchnode = numa_mem_id(); | |
1908 | else if (!node_present_pages(node)) | |
1909 | searchnode = node_to_mem_node(node); | |
81819f0f | 1910 | |
8ba00bb6 | 1911 | object = get_partial_node(s, get_node(s, searchnode), c, flags); |
497b66f2 CL |
1912 | if (object || node != NUMA_NO_NODE) |
1913 | return object; | |
81819f0f | 1914 | |
acd19fd1 | 1915 | return get_any_partial(s, flags, c); |
81819f0f CL |
1916 | } |
1917 | ||
8a5ec0ba CL |
1918 | #ifdef CONFIG_PREEMPT |
1919 | /* | |
1920 | * Calculate the next globally unique transaction for disambiguiation | |
1921 | * during cmpxchg. The transactions start with the cpu number and are then | |
1922 | * incremented by CONFIG_NR_CPUS. | |
1923 | */ | |
1924 | #define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS) | |
1925 | #else | |
1926 | /* | |
1927 | * No preemption supported therefore also no need to check for | |
1928 | * different cpus. | |
1929 | */ | |
1930 | #define TID_STEP 1 | |
1931 | #endif | |
1932 | ||
1933 | static inline unsigned long next_tid(unsigned long tid) | |
1934 | { | |
1935 | return tid + TID_STEP; | |
1936 | } | |
1937 | ||
1938 | static inline unsigned int tid_to_cpu(unsigned long tid) | |
1939 | { | |
1940 | return tid % TID_STEP; | |
1941 | } | |
1942 | ||
1943 | static inline unsigned long tid_to_event(unsigned long tid) | |
1944 | { | |
1945 | return tid / TID_STEP; | |
1946 | } | |
1947 | ||
1948 | static inline unsigned int init_tid(int cpu) | |
1949 | { | |
1950 | return cpu; | |
1951 | } | |
1952 | ||
1953 | static inline void note_cmpxchg_failure(const char *n, | |
1954 | const struct kmem_cache *s, unsigned long tid) | |
1955 | { | |
1956 | #ifdef SLUB_DEBUG_CMPXCHG | |
1957 | unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid); | |
1958 | ||
f9f58285 | 1959 | pr_info("%s %s: cmpxchg redo ", n, s->name); |
8a5ec0ba CL |
1960 | |
1961 | #ifdef CONFIG_PREEMPT | |
1962 | if (tid_to_cpu(tid) != tid_to_cpu(actual_tid)) | |
f9f58285 | 1963 | pr_warn("due to cpu change %d -> %d\n", |
8a5ec0ba CL |
1964 | tid_to_cpu(tid), tid_to_cpu(actual_tid)); |
1965 | else | |
1966 | #endif | |
1967 | if (tid_to_event(tid) != tid_to_event(actual_tid)) | |
f9f58285 | 1968 | pr_warn("due to cpu running other code. Event %ld->%ld\n", |
8a5ec0ba CL |
1969 | tid_to_event(tid), tid_to_event(actual_tid)); |
1970 | else | |
f9f58285 | 1971 | pr_warn("for unknown reason: actual=%lx was=%lx target=%lx\n", |
8a5ec0ba CL |
1972 | actual_tid, tid, next_tid(tid)); |
1973 | #endif | |
4fdccdfb | 1974 | stat(s, CMPXCHG_DOUBLE_CPU_FAIL); |
8a5ec0ba CL |
1975 | } |
1976 | ||
788e1aad | 1977 | static void init_kmem_cache_cpus(struct kmem_cache *s) |
8a5ec0ba | 1978 | { |
8a5ec0ba CL |
1979 | int cpu; |
1980 | ||
1981 | for_each_possible_cpu(cpu) | |
1982 | per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu); | |
8a5ec0ba | 1983 | } |
2cfb7455 | 1984 | |
81819f0f CL |
1985 | /* |
1986 | * Remove the cpu slab | |
1987 | */ | |
d0e0ac97 CG |
1988 | static void deactivate_slab(struct kmem_cache *s, struct page *page, |
1989 | void *freelist) | |
81819f0f | 1990 | { |
2cfb7455 | 1991 | enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; |
2cfb7455 CL |
1992 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
1993 | int lock = 0; | |
1994 | enum slab_modes l = M_NONE, m = M_NONE; | |
2cfb7455 | 1995 | void *nextfree; |
136333d1 | 1996 | int tail = DEACTIVATE_TO_HEAD; |
2cfb7455 CL |
1997 | struct page new; |
1998 | struct page old; | |
1999 | ||
2000 | if (page->freelist) { | |
84e554e6 | 2001 | stat(s, DEACTIVATE_REMOTE_FREES); |
136333d1 | 2002 | tail = DEACTIVATE_TO_TAIL; |
2cfb7455 CL |
2003 | } |
2004 | ||
894b8788 | 2005 | /* |
2cfb7455 CL |
2006 | * Stage one: Free all available per cpu objects back |
2007 | * to the page freelist while it is still frozen. Leave the | |
2008 | * last one. | |
2009 | * | |
2010 | * There is no need to take the list->lock because the page | |
2011 | * is still frozen. | |
2012 | */ | |
2013 | while (freelist && (nextfree = get_freepointer(s, freelist))) { | |
2014 | void *prior; | |
2015 | unsigned long counters; | |
2016 | ||
2017 | do { | |
2018 | prior = page->freelist; | |
2019 | counters = page->counters; | |
2020 | set_freepointer(s, freelist, prior); | |
2021 | new.counters = counters; | |
2022 | new.inuse--; | |
a0132ac0 | 2023 | VM_BUG_ON(!new.frozen); |
2cfb7455 | 2024 | |
1d07171c | 2025 | } while (!__cmpxchg_double_slab(s, page, |
2cfb7455 CL |
2026 | prior, counters, |
2027 | freelist, new.counters, | |
2028 | "drain percpu freelist")); | |
2029 | ||
2030 | freelist = nextfree; | |
2031 | } | |
2032 | ||
894b8788 | 2033 | /* |
2cfb7455 CL |
2034 | * Stage two: Ensure that the page is unfrozen while the |
2035 | * list presence reflects the actual number of objects | |
2036 | * during unfreeze. | |
2037 | * | |
2038 | * We setup the list membership and then perform a cmpxchg | |
2039 | * with the count. If there is a mismatch then the page | |
2040 | * is not unfrozen but the page is on the wrong list. | |
2041 | * | |
2042 | * Then we restart the process which may have to remove | |
2043 | * the page from the list that we just put it on again | |
2044 | * because the number of objects in the slab may have | |
2045 | * changed. | |
894b8788 | 2046 | */ |
2cfb7455 | 2047 | redo: |
894b8788 | 2048 | |
2cfb7455 CL |
2049 | old.freelist = page->freelist; |
2050 | old.counters = page->counters; | |
a0132ac0 | 2051 | VM_BUG_ON(!old.frozen); |
7c2e132c | 2052 | |
2cfb7455 CL |
2053 | /* Determine target state of the slab */ |
2054 | new.counters = old.counters; | |
2055 | if (freelist) { | |
2056 | new.inuse--; | |
2057 | set_freepointer(s, freelist, old.freelist); | |
2058 | new.freelist = freelist; | |
2059 | } else | |
2060 | new.freelist = old.freelist; | |
2061 | ||
2062 | new.frozen = 0; | |
2063 | ||
8a5b20ae | 2064 | if (!new.inuse && n->nr_partial >= s->min_partial) |
2cfb7455 CL |
2065 | m = M_FREE; |
2066 | else if (new.freelist) { | |
2067 | m = M_PARTIAL; | |
2068 | if (!lock) { | |
2069 | lock = 1; | |
2070 | /* | |
2071 | * Taking the spinlock removes the possiblity | |
2072 | * that acquire_slab() will see a slab page that | |
2073 | * is frozen | |
2074 | */ | |
2075 | spin_lock(&n->list_lock); | |
2076 | } | |
2077 | } else { | |
2078 | m = M_FULL; | |
2079 | if (kmem_cache_debug(s) && !lock) { | |
2080 | lock = 1; | |
2081 | /* | |
2082 | * This also ensures that the scanning of full | |
2083 | * slabs from diagnostic functions will not see | |
2084 | * any frozen slabs. | |
2085 | */ | |
2086 | spin_lock(&n->list_lock); | |
2087 | } | |
2088 | } | |
2089 | ||
2090 | if (l != m) { | |
2091 | ||
2092 | if (l == M_PARTIAL) | |
2093 | ||
2094 | remove_partial(n, page); | |
2095 | ||
2096 | else if (l == M_FULL) | |
894b8788 | 2097 | |
c65c1877 | 2098 | remove_full(s, n, page); |
2cfb7455 CL |
2099 | |
2100 | if (m == M_PARTIAL) { | |
2101 | ||
2102 | add_partial(n, page, tail); | |
136333d1 | 2103 | stat(s, tail); |
2cfb7455 CL |
2104 | |
2105 | } else if (m == M_FULL) { | |
894b8788 | 2106 | |
2cfb7455 CL |
2107 | stat(s, DEACTIVATE_FULL); |
2108 | add_full(s, n, page); | |
2109 | ||
2110 | } | |
2111 | } | |
2112 | ||
2113 | l = m; | |
1d07171c | 2114 | if (!__cmpxchg_double_slab(s, page, |
2cfb7455 CL |
2115 | old.freelist, old.counters, |
2116 | new.freelist, new.counters, | |
2117 | "unfreezing slab")) | |
2118 | goto redo; | |
2119 | ||
2cfb7455 CL |
2120 | if (lock) |
2121 | spin_unlock(&n->list_lock); | |
2122 | ||
2123 | if (m == M_FREE) { | |
2124 | stat(s, DEACTIVATE_EMPTY); | |
2125 | discard_slab(s, page); | |
2126 | stat(s, FREE_SLAB); | |
894b8788 | 2127 | } |
81819f0f CL |
2128 | } |
2129 | ||
d24ac77f JK |
2130 | /* |
2131 | * Unfreeze all the cpu partial slabs. | |
2132 | * | |
59a09917 CL |
2133 | * This function must be called with interrupts disabled |
2134 | * for the cpu using c (or some other guarantee must be there | |
2135 | * to guarantee no concurrent accesses). | |
d24ac77f | 2136 | */ |
59a09917 CL |
2137 | static void unfreeze_partials(struct kmem_cache *s, |
2138 | struct kmem_cache_cpu *c) | |
49e22585 | 2139 | { |
345c905d | 2140 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
43d77867 | 2141 | struct kmem_cache_node *n = NULL, *n2 = NULL; |
9ada1934 | 2142 | struct page *page, *discard_page = NULL; |
49e22585 CL |
2143 | |
2144 | while ((page = c->partial)) { | |
49e22585 CL |
2145 | struct page new; |
2146 | struct page old; | |
2147 | ||
2148 | c->partial = page->next; | |
43d77867 JK |
2149 | |
2150 | n2 = get_node(s, page_to_nid(page)); | |
2151 | if (n != n2) { | |
2152 | if (n) | |
2153 | spin_unlock(&n->list_lock); | |
2154 | ||
2155 | n = n2; | |
2156 | spin_lock(&n->list_lock); | |
2157 | } | |
49e22585 CL |
2158 | |
2159 | do { | |
2160 | ||
2161 | old.freelist = page->freelist; | |
2162 | old.counters = page->counters; | |
a0132ac0 | 2163 | VM_BUG_ON(!old.frozen); |
49e22585 CL |
2164 | |
2165 | new.counters = old.counters; | |
2166 | new.freelist = old.freelist; | |
2167 | ||
2168 | new.frozen = 0; | |
2169 | ||
d24ac77f | 2170 | } while (!__cmpxchg_double_slab(s, page, |
49e22585 CL |
2171 | old.freelist, old.counters, |
2172 | new.freelist, new.counters, | |
2173 | "unfreezing slab")); | |
2174 | ||
8a5b20ae | 2175 | if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) { |
9ada1934 SL |
2176 | page->next = discard_page; |
2177 | discard_page = page; | |
43d77867 JK |
2178 | } else { |
2179 | add_partial(n, page, DEACTIVATE_TO_TAIL); | |
2180 | stat(s, FREE_ADD_PARTIAL); | |
49e22585 CL |
2181 | } |
2182 | } | |
2183 | ||
2184 | if (n) | |
2185 | spin_unlock(&n->list_lock); | |
9ada1934 SL |
2186 | |
2187 | while (discard_page) { | |
2188 | page = discard_page; | |
2189 | discard_page = discard_page->next; | |
2190 | ||
2191 | stat(s, DEACTIVATE_EMPTY); | |
2192 | discard_slab(s, page); | |
2193 | stat(s, FREE_SLAB); | |
2194 | } | |
345c905d | 2195 | #endif |
49e22585 CL |
2196 | } |
2197 | ||
2198 | /* | |
2199 | * Put a page that was just frozen (in __slab_free) into a partial page | |
2200 | * slot if available. This is done without interrupts disabled and without | |
2201 | * preemption disabled. The cmpxchg is racy and may put the partial page | |
2202 | * onto a random cpus partial slot. | |
2203 | * | |
2204 | * If we did not find a slot then simply move all the partials to the | |
2205 | * per node partial list. | |
2206 | */ | |
633b0764 | 2207 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) |
49e22585 | 2208 | { |
345c905d | 2209 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
49e22585 CL |
2210 | struct page *oldpage; |
2211 | int pages; | |
2212 | int pobjects; | |
2213 | ||
d6e0b7fa | 2214 | preempt_disable(); |
49e22585 CL |
2215 | do { |
2216 | pages = 0; | |
2217 | pobjects = 0; | |
2218 | oldpage = this_cpu_read(s->cpu_slab->partial); | |
2219 | ||
2220 | if (oldpage) { | |
2221 | pobjects = oldpage->pobjects; | |
2222 | pages = oldpage->pages; | |
2223 | if (drain && pobjects > s->cpu_partial) { | |
2224 | unsigned long flags; | |
2225 | /* | |
2226 | * partial array is full. Move the existing | |
2227 | * set to the per node partial list. | |
2228 | */ | |
2229 | local_irq_save(flags); | |
59a09917 | 2230 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); |
49e22585 | 2231 | local_irq_restore(flags); |
e24fc410 | 2232 | oldpage = NULL; |
49e22585 CL |
2233 | pobjects = 0; |
2234 | pages = 0; | |
8028dcea | 2235 | stat(s, CPU_PARTIAL_DRAIN); |
49e22585 CL |
2236 | } |
2237 | } | |
2238 | ||
2239 | pages++; | |
2240 | pobjects += page->objects - page->inuse; | |
2241 | ||
2242 | page->pages = pages; | |
2243 | page->pobjects = pobjects; | |
2244 | page->next = oldpage; | |
2245 | ||
d0e0ac97 CG |
2246 | } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) |
2247 | != oldpage); | |
d6e0b7fa VD |
2248 | if (unlikely(!s->cpu_partial)) { |
2249 | unsigned long flags; | |
2250 | ||
2251 | local_irq_save(flags); | |
2252 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); | |
2253 | local_irq_restore(flags); | |
2254 | } | |
2255 | preempt_enable(); | |
345c905d | 2256 | #endif |
49e22585 CL |
2257 | } |
2258 | ||
dfb4f096 | 2259 | static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) |
81819f0f | 2260 | { |
84e554e6 | 2261 | stat(s, CPUSLAB_FLUSH); |
c17dda40 CL |
2262 | deactivate_slab(s, c->page, c->freelist); |
2263 | ||
2264 | c->tid = next_tid(c->tid); | |
2265 | c->page = NULL; | |
2266 | c->freelist = NULL; | |
81819f0f CL |
2267 | } |
2268 | ||
2269 | /* | |
2270 | * Flush cpu slab. | |
6446faa2 | 2271 | * |
81819f0f CL |
2272 | * Called from IPI handler with interrupts disabled. |
2273 | */ | |
0c710013 | 2274 | static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) |
81819f0f | 2275 | { |
9dfc6e68 | 2276 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
81819f0f | 2277 | |
49e22585 CL |
2278 | if (likely(c)) { |
2279 | if (c->page) | |
2280 | flush_slab(s, c); | |
2281 | ||
59a09917 | 2282 | unfreeze_partials(s, c); |
49e22585 | 2283 | } |
81819f0f CL |
2284 | } |
2285 | ||
2286 | static void flush_cpu_slab(void *d) | |
2287 | { | |
2288 | struct kmem_cache *s = d; | |
81819f0f | 2289 | |
dfb4f096 | 2290 | __flush_cpu_slab(s, smp_processor_id()); |
81819f0f CL |
2291 | } |
2292 | ||
a8364d55 GBY |
2293 | static bool has_cpu_slab(int cpu, void *info) |
2294 | { | |
2295 | struct kmem_cache *s = info; | |
2296 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); | |
2297 | ||
02e1a9cd | 2298 | return c->page || c->partial; |
a8364d55 GBY |
2299 | } |
2300 | ||
81819f0f CL |
2301 | static void flush_all(struct kmem_cache *s) |
2302 | { | |
a8364d55 | 2303 | on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC); |
81819f0f CL |
2304 | } |
2305 | ||
dfb4f096 CL |
2306 | /* |
2307 | * Check if the objects in a per cpu structure fit numa | |
2308 | * locality expectations. | |
2309 | */ | |
57d437d2 | 2310 | static inline int node_match(struct page *page, int node) |
dfb4f096 CL |
2311 | { |
2312 | #ifdef CONFIG_NUMA | |
4d7868e6 | 2313 | if (!page || (node != NUMA_NO_NODE && page_to_nid(page) != node)) |
dfb4f096 CL |
2314 | return 0; |
2315 | #endif | |
2316 | return 1; | |
2317 | } | |
2318 | ||
9a02d699 | 2319 | #ifdef CONFIG_SLUB_DEBUG |
781b2ba6 PE |
2320 | static int count_free(struct page *page) |
2321 | { | |
2322 | return page->objects - page->inuse; | |
2323 | } | |
2324 | ||
9a02d699 DR |
2325 | static inline unsigned long node_nr_objs(struct kmem_cache_node *n) |
2326 | { | |
2327 | return atomic_long_read(&n->total_objects); | |
2328 | } | |
2329 | #endif /* CONFIG_SLUB_DEBUG */ | |
2330 | ||
2331 | #if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SYSFS) | |
781b2ba6 PE |
2332 | static unsigned long count_partial(struct kmem_cache_node *n, |
2333 | int (*get_count)(struct page *)) | |
2334 | { | |
2335 | unsigned long flags; | |
2336 | unsigned long x = 0; | |
2337 | struct page *page; | |
2338 | ||
2339 | spin_lock_irqsave(&n->list_lock, flags); | |
2340 | list_for_each_entry(page, &n->partial, lru) | |
2341 | x += get_count(page); | |
2342 | spin_unlock_irqrestore(&n->list_lock, flags); | |
2343 | return x; | |
2344 | } | |
9a02d699 | 2345 | #endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */ |
26c02cf0 | 2346 | |
781b2ba6 PE |
2347 | static noinline void |
2348 | slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid) | |
2349 | { | |
9a02d699 DR |
2350 | #ifdef CONFIG_SLUB_DEBUG |
2351 | static DEFINE_RATELIMIT_STATE(slub_oom_rs, DEFAULT_RATELIMIT_INTERVAL, | |
2352 | DEFAULT_RATELIMIT_BURST); | |
781b2ba6 | 2353 | int node; |
fa45dc25 | 2354 | struct kmem_cache_node *n; |
781b2ba6 | 2355 | |
9a02d699 DR |
2356 | if ((gfpflags & __GFP_NOWARN) || !__ratelimit(&slub_oom_rs)) |
2357 | return; | |
2358 | ||
5b3810e5 VB |
2359 | pr_warn("SLUB: Unable to allocate memory on node %d, gfp=%#x(%pGg)\n", |
2360 | nid, gfpflags, &gfpflags); | |
f9f58285 FF |
2361 | pr_warn(" cache: %s, object size: %d, buffer size: %d, default order: %d, min order: %d\n", |
2362 | s->name, s->object_size, s->size, oo_order(s->oo), | |
2363 | oo_order(s->min)); | |
781b2ba6 | 2364 | |
3b0efdfa | 2365 | if (oo_order(s->min) > get_order(s->object_size)) |
f9f58285 FF |
2366 | pr_warn(" %s debugging increased min order, use slub_debug=O to disable.\n", |
2367 | s->name); | |
fa5ec8a1 | 2368 | |
fa45dc25 | 2369 | for_each_kmem_cache_node(s, node, n) { |
781b2ba6 PE |
2370 | unsigned long nr_slabs; |
2371 | unsigned long nr_objs; | |
2372 | unsigned long nr_free; | |
2373 | ||
26c02cf0 AB |
2374 | nr_free = count_partial(n, count_free); |
2375 | nr_slabs = node_nr_slabs(n); | |
2376 | nr_objs = node_nr_objs(n); | |
781b2ba6 | 2377 | |
f9f58285 | 2378 | pr_warn(" node %d: slabs: %ld, objs: %ld, free: %ld\n", |
781b2ba6 PE |
2379 | node, nr_slabs, nr_objs, nr_free); |
2380 | } | |
9a02d699 | 2381 | #endif |
781b2ba6 PE |
2382 | } |
2383 | ||
497b66f2 CL |
2384 | static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags, |
2385 | int node, struct kmem_cache_cpu **pc) | |
2386 | { | |
6faa6833 | 2387 | void *freelist; |
188fd063 CL |
2388 | struct kmem_cache_cpu *c = *pc; |
2389 | struct page *page; | |
497b66f2 | 2390 | |
188fd063 | 2391 | freelist = get_partial(s, flags, node, c); |
497b66f2 | 2392 | |
188fd063 CL |
2393 | if (freelist) |
2394 | return freelist; | |
2395 | ||
2396 | page = new_slab(s, flags, node); | |
497b66f2 | 2397 | if (page) { |
7c8e0181 | 2398 | c = raw_cpu_ptr(s->cpu_slab); |
497b66f2 CL |
2399 | if (c->page) |
2400 | flush_slab(s, c); | |
2401 | ||
2402 | /* | |
2403 | * No other reference to the page yet so we can | |
2404 | * muck around with it freely without cmpxchg | |
2405 | */ | |
6faa6833 | 2406 | freelist = page->freelist; |
497b66f2 CL |
2407 | page->freelist = NULL; |
2408 | ||
2409 | stat(s, ALLOC_SLAB); | |
497b66f2 CL |
2410 | c->page = page; |
2411 | *pc = c; | |
2412 | } else | |
6faa6833 | 2413 | freelist = NULL; |
497b66f2 | 2414 | |
6faa6833 | 2415 | return freelist; |
497b66f2 CL |
2416 | } |
2417 | ||
072bb0aa MG |
2418 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags) |
2419 | { | |
2420 | if (unlikely(PageSlabPfmemalloc(page))) | |
2421 | return gfp_pfmemalloc_allowed(gfpflags); | |
2422 | ||
2423 | return true; | |
2424 | } | |
2425 | ||
213eeb9f | 2426 | /* |
d0e0ac97 CG |
2427 | * Check the page->freelist of a page and either transfer the freelist to the |
2428 | * per cpu freelist or deactivate the page. | |
213eeb9f CL |
2429 | * |
2430 | * The page is still frozen if the return value is not NULL. | |
2431 | * | |
2432 | * If this function returns NULL then the page has been unfrozen. | |
d24ac77f JK |
2433 | * |
2434 | * This function must be called with interrupt disabled. | |
213eeb9f CL |
2435 | */ |
2436 | static inline void *get_freelist(struct kmem_cache *s, struct page *page) | |
2437 | { | |
2438 | struct page new; | |
2439 | unsigned long counters; | |
2440 | void *freelist; | |
2441 | ||
2442 | do { | |
2443 | freelist = page->freelist; | |
2444 | counters = page->counters; | |
6faa6833 | 2445 | |
213eeb9f | 2446 | new.counters = counters; |
a0132ac0 | 2447 | VM_BUG_ON(!new.frozen); |
213eeb9f CL |
2448 | |
2449 | new.inuse = page->objects; | |
2450 | new.frozen = freelist != NULL; | |
2451 | ||
d24ac77f | 2452 | } while (!__cmpxchg_double_slab(s, page, |
213eeb9f CL |
2453 | freelist, counters, |
2454 | NULL, new.counters, | |
2455 | "get_freelist")); | |
2456 | ||
2457 | return freelist; | |
2458 | } | |
2459 | ||
81819f0f | 2460 | /* |
894b8788 CL |
2461 | * Slow path. The lockless freelist is empty or we need to perform |
2462 | * debugging duties. | |
2463 | * | |
894b8788 CL |
2464 | * Processing is still very fast if new objects have been freed to the |
2465 | * regular freelist. In that case we simply take over the regular freelist | |
2466 | * as the lockless freelist and zap the regular freelist. | |
81819f0f | 2467 | * |
894b8788 CL |
2468 | * If that is not working then we fall back to the partial lists. We take the |
2469 | * first element of the freelist as the object to allocate now and move the | |
2470 | * rest of the freelist to the lockless freelist. | |
81819f0f | 2471 | * |
894b8788 | 2472 | * And if we were unable to get a new slab from the partial slab lists then |
6446faa2 CL |
2473 | * we need to allocate a new slab. This is the slowest path since it involves |
2474 | * a call to the page allocator and the setup of a new slab. | |
a380a3c7 CL |
2475 | * |
2476 | * Version of __slab_alloc to use when we know that interrupts are | |
2477 | * already disabled (which is the case for bulk allocation). | |
81819f0f | 2478 | */ |
a380a3c7 | 2479 | static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
ce71e27c | 2480 | unsigned long addr, struct kmem_cache_cpu *c) |
81819f0f | 2481 | { |
6faa6833 | 2482 | void *freelist; |
f6e7def7 | 2483 | struct page *page; |
81819f0f | 2484 | |
f6e7def7 CL |
2485 | page = c->page; |
2486 | if (!page) | |
81819f0f | 2487 | goto new_slab; |
49e22585 | 2488 | redo: |
6faa6833 | 2489 | |
57d437d2 | 2490 | if (unlikely(!node_match(page, node))) { |
a561ce00 JK |
2491 | int searchnode = node; |
2492 | ||
2493 | if (node != NUMA_NO_NODE && !node_present_pages(node)) | |
2494 | searchnode = node_to_mem_node(node); | |
2495 | ||
2496 | if (unlikely(!node_match(page, searchnode))) { | |
2497 | stat(s, ALLOC_NODE_MISMATCH); | |
2498 | deactivate_slab(s, page, c->freelist); | |
2499 | c->page = NULL; | |
2500 | c->freelist = NULL; | |
2501 | goto new_slab; | |
2502 | } | |
fc59c053 | 2503 | } |
6446faa2 | 2504 | |
072bb0aa MG |
2505 | /* |
2506 | * By rights, we should be searching for a slab page that was | |
2507 | * PFMEMALLOC but right now, we are losing the pfmemalloc | |
2508 | * information when the page leaves the per-cpu allocator | |
2509 | */ | |
2510 | if (unlikely(!pfmemalloc_match(page, gfpflags))) { | |
2511 | deactivate_slab(s, page, c->freelist); | |
2512 | c->page = NULL; | |
2513 | c->freelist = NULL; | |
2514 | goto new_slab; | |
2515 | } | |
2516 | ||
73736e03 | 2517 | /* must check again c->freelist in case of cpu migration or IRQ */ |
6faa6833 CL |
2518 | freelist = c->freelist; |
2519 | if (freelist) | |
73736e03 | 2520 | goto load_freelist; |
03e404af | 2521 | |
f6e7def7 | 2522 | freelist = get_freelist(s, page); |
6446faa2 | 2523 | |
6faa6833 | 2524 | if (!freelist) { |
03e404af CL |
2525 | c->page = NULL; |
2526 | stat(s, DEACTIVATE_BYPASS); | |
fc59c053 | 2527 | goto new_slab; |
03e404af | 2528 | } |
6446faa2 | 2529 | |
84e554e6 | 2530 | stat(s, ALLOC_REFILL); |
6446faa2 | 2531 | |
894b8788 | 2532 | load_freelist: |
507effea CL |
2533 | /* |
2534 | * freelist is pointing to the list of objects to be used. | |
2535 | * page is pointing to the page from which the objects are obtained. | |
2536 | * That page must be frozen for per cpu allocations to work. | |
2537 | */ | |
a0132ac0 | 2538 | VM_BUG_ON(!c->page->frozen); |
6faa6833 | 2539 | c->freelist = get_freepointer(s, freelist); |
8a5ec0ba | 2540 | c->tid = next_tid(c->tid); |
6faa6833 | 2541 | return freelist; |
81819f0f | 2542 | |
81819f0f | 2543 | new_slab: |
2cfb7455 | 2544 | |
49e22585 | 2545 | if (c->partial) { |
f6e7def7 CL |
2546 | page = c->page = c->partial; |
2547 | c->partial = page->next; | |
49e22585 CL |
2548 | stat(s, CPU_PARTIAL_ALLOC); |
2549 | c->freelist = NULL; | |
2550 | goto redo; | |
81819f0f CL |
2551 | } |
2552 | ||
188fd063 | 2553 | freelist = new_slab_objects(s, gfpflags, node, &c); |
01ad8a7b | 2554 | |
f4697436 | 2555 | if (unlikely(!freelist)) { |
9a02d699 | 2556 | slab_out_of_memory(s, gfpflags, node); |
f4697436 | 2557 | return NULL; |
81819f0f | 2558 | } |
2cfb7455 | 2559 | |
f6e7def7 | 2560 | page = c->page; |
5091b74a | 2561 | if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) |
4b6f0750 | 2562 | goto load_freelist; |
2cfb7455 | 2563 | |
497b66f2 | 2564 | /* Only entered in the debug case */ |
d0e0ac97 CG |
2565 | if (kmem_cache_debug(s) && |
2566 | !alloc_debug_processing(s, page, freelist, addr)) | |
497b66f2 | 2567 | goto new_slab; /* Slab failed checks. Next slab needed */ |
894b8788 | 2568 | |
f6e7def7 | 2569 | deactivate_slab(s, page, get_freepointer(s, freelist)); |
c17dda40 CL |
2570 | c->page = NULL; |
2571 | c->freelist = NULL; | |
6faa6833 | 2572 | return freelist; |
894b8788 CL |
2573 | } |
2574 | ||
a380a3c7 CL |
2575 | /* |
2576 | * Another one that disabled interrupt and compensates for possible | |
2577 | * cpu changes by refetching the per cpu area pointer. | |
2578 | */ | |
2579 | static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, | |
2580 | unsigned long addr, struct kmem_cache_cpu *c) | |
2581 | { | |
2582 | void *p; | |
2583 | unsigned long flags; | |
2584 | ||
2585 | local_irq_save(flags); | |
2586 | #ifdef CONFIG_PREEMPT | |
2587 | /* | |
2588 | * We may have been preempted and rescheduled on a different | |
2589 | * cpu before disabling interrupts. Need to reload cpu area | |
2590 | * pointer. | |
2591 | */ | |
2592 | c = this_cpu_ptr(s->cpu_slab); | |
2593 | #endif | |
2594 | ||
2595 | p = ___slab_alloc(s, gfpflags, node, addr, c); | |
2596 | local_irq_restore(flags); | |
2597 | return p; | |
2598 | } | |
2599 | ||
894b8788 CL |
2600 | /* |
2601 | * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc) | |
2602 | * have the fastpath folded into their functions. So no function call | |
2603 | * overhead for requests that can be satisfied on the fastpath. | |
2604 | * | |
2605 | * The fastpath works by first checking if the lockless freelist can be used. | |
2606 | * If not then __slab_alloc is called for slow processing. | |
2607 | * | |
2608 | * Otherwise we can simply pick the next object from the lockless free list. | |
2609 | */ | |
2b847c3c | 2610 | static __always_inline void *slab_alloc_node(struct kmem_cache *s, |
ce71e27c | 2611 | gfp_t gfpflags, int node, unsigned long addr) |
894b8788 | 2612 | { |
03ec0ed5 | 2613 | void *object; |
dfb4f096 | 2614 | struct kmem_cache_cpu *c; |
57d437d2 | 2615 | struct page *page; |
8a5ec0ba | 2616 | unsigned long tid; |
1f84260c | 2617 | |
8135be5a VD |
2618 | s = slab_pre_alloc_hook(s, gfpflags); |
2619 | if (!s) | |
773ff60e | 2620 | return NULL; |
8a5ec0ba | 2621 | redo: |
8a5ec0ba CL |
2622 | /* |
2623 | * Must read kmem_cache cpu data via this cpu ptr. Preemption is | |
2624 | * enabled. We may switch back and forth between cpus while | |
2625 | * reading from one cpu area. That does not matter as long | |
2626 | * as we end up on the original cpu again when doing the cmpxchg. | |
7cccd80b | 2627 | * |
9aabf810 JK |
2628 | * We should guarantee that tid and kmem_cache are retrieved on |
2629 | * the same cpu. It could be different if CONFIG_PREEMPT so we need | |
2630 | * to check if it is matched or not. | |
8a5ec0ba | 2631 | */ |
9aabf810 JK |
2632 | do { |
2633 | tid = this_cpu_read(s->cpu_slab->tid); | |
2634 | c = raw_cpu_ptr(s->cpu_slab); | |
859b7a0e MR |
2635 | } while (IS_ENABLED(CONFIG_PREEMPT) && |
2636 | unlikely(tid != READ_ONCE(c->tid))); | |
9aabf810 JK |
2637 | |
2638 | /* | |
2639 | * Irqless object alloc/free algorithm used here depends on sequence | |
2640 | * of fetching cpu_slab's data. tid should be fetched before anything | |
2641 | * on c to guarantee that object and page associated with previous tid | |
2642 | * won't be used with current tid. If we fetch tid first, object and | |
2643 | * page could be one associated with next tid and our alloc/free | |
2644 | * request will be failed. In this case, we will retry. So, no problem. | |
2645 | */ | |
2646 | barrier(); | |
8a5ec0ba | 2647 | |
8a5ec0ba CL |
2648 | /* |
2649 | * The transaction ids are globally unique per cpu and per operation on | |
2650 | * a per cpu queue. Thus they can be guarantee that the cmpxchg_double | |
2651 | * occurs on the right processor and that there was no operation on the | |
2652 | * linked list in between. | |
2653 | */ | |
8a5ec0ba | 2654 | |
9dfc6e68 | 2655 | object = c->freelist; |
57d437d2 | 2656 | page = c->page; |
8eae1492 | 2657 | if (unlikely(!object || !node_match(page, node))) { |
dfb4f096 | 2658 | object = __slab_alloc(s, gfpflags, node, addr, c); |
8eae1492 DH |
2659 | stat(s, ALLOC_SLOWPATH); |
2660 | } else { | |
0ad9500e ED |
2661 | void *next_object = get_freepointer_safe(s, object); |
2662 | ||
8a5ec0ba | 2663 | /* |
25985edc | 2664 | * The cmpxchg will only match if there was no additional |
8a5ec0ba CL |
2665 | * operation and if we are on the right processor. |
2666 | * | |
d0e0ac97 CG |
2667 | * The cmpxchg does the following atomically (without lock |
2668 | * semantics!) | |
8a5ec0ba CL |
2669 | * 1. Relocate first pointer to the current per cpu area. |
2670 | * 2. Verify that tid and freelist have not been changed | |
2671 | * 3. If they were not changed replace tid and freelist | |
2672 | * | |
d0e0ac97 CG |
2673 | * Since this is without lock semantics the protection is only |
2674 | * against code executing on this cpu *not* from access by | |
2675 | * other cpus. | |
8a5ec0ba | 2676 | */ |
933393f5 | 2677 | if (unlikely(!this_cpu_cmpxchg_double( |
8a5ec0ba CL |
2678 | s->cpu_slab->freelist, s->cpu_slab->tid, |
2679 | object, tid, | |
0ad9500e | 2680 | next_object, next_tid(tid)))) { |
8a5ec0ba CL |
2681 | |
2682 | note_cmpxchg_failure("slab_alloc", s, tid); | |
2683 | goto redo; | |
2684 | } | |
0ad9500e | 2685 | prefetch_freepointer(s, next_object); |
84e554e6 | 2686 | stat(s, ALLOC_FASTPATH); |
894b8788 | 2687 | } |
8a5ec0ba | 2688 | |
74e2134f | 2689 | if (unlikely(gfpflags & __GFP_ZERO) && object) |
3b0efdfa | 2690 | memset(object, 0, s->object_size); |
d07dbea4 | 2691 | |
03ec0ed5 | 2692 | slab_post_alloc_hook(s, gfpflags, 1, &object); |
5a896d9e | 2693 | |
894b8788 | 2694 | return object; |
81819f0f CL |
2695 | } |
2696 | ||
2b847c3c EG |
2697 | static __always_inline void *slab_alloc(struct kmem_cache *s, |
2698 | gfp_t gfpflags, unsigned long addr) | |
2699 | { | |
2700 | return slab_alloc_node(s, gfpflags, NUMA_NO_NODE, addr); | |
2701 | } | |
2702 | ||
81819f0f CL |
2703 | void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) |
2704 | { | |
2b847c3c | 2705 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
5b882be4 | 2706 | |
d0e0ac97 CG |
2707 | trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size, |
2708 | s->size, gfpflags); | |
5b882be4 EGM |
2709 | |
2710 | return ret; | |
81819f0f CL |
2711 | } |
2712 | EXPORT_SYMBOL(kmem_cache_alloc); | |
2713 | ||
0f24f128 | 2714 | #ifdef CONFIG_TRACING |
4a92379b RK |
2715 | void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) |
2716 | { | |
2b847c3c | 2717 | void *ret = slab_alloc(s, gfpflags, _RET_IP_); |
4a92379b | 2718 | trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); |
505f5dcb | 2719 | kasan_kmalloc(s, ret, size, gfpflags); |
4a92379b RK |
2720 | return ret; |
2721 | } | |
2722 | EXPORT_SYMBOL(kmem_cache_alloc_trace); | |
5b882be4 EGM |
2723 | #endif |
2724 | ||
81819f0f CL |
2725 | #ifdef CONFIG_NUMA |
2726 | void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) | |
2727 | { | |
2b847c3c | 2728 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
5b882be4 | 2729 | |
ca2b84cb | 2730 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
3b0efdfa | 2731 | s->object_size, s->size, gfpflags, node); |
5b882be4 EGM |
2732 | |
2733 | return ret; | |
81819f0f CL |
2734 | } |
2735 | EXPORT_SYMBOL(kmem_cache_alloc_node); | |
81819f0f | 2736 | |
0f24f128 | 2737 | #ifdef CONFIG_TRACING |
4a92379b | 2738 | void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
5b882be4 | 2739 | gfp_t gfpflags, |
4a92379b | 2740 | int node, size_t size) |
5b882be4 | 2741 | { |
2b847c3c | 2742 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_); |
4a92379b RK |
2743 | |
2744 | trace_kmalloc_node(_RET_IP_, ret, | |
2745 | size, s->size, gfpflags, node); | |
0316bec2 | 2746 | |
505f5dcb | 2747 | kasan_kmalloc(s, ret, size, gfpflags); |
4a92379b | 2748 | return ret; |
5b882be4 | 2749 | } |
4a92379b | 2750 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
5b882be4 | 2751 | #endif |
5d1f57e4 | 2752 | #endif |
5b882be4 | 2753 | |
81819f0f | 2754 | /* |
94e4d712 | 2755 | * Slow path handling. This may still be called frequently since objects |
894b8788 | 2756 | * have a longer lifetime than the cpu slabs in most processing loads. |
81819f0f | 2757 | * |
894b8788 CL |
2758 | * So we still attempt to reduce cache line usage. Just take the slab |
2759 | * lock and free the item. If there is no additional partial page | |
2760 | * handling required then we can return immediately. | |
81819f0f | 2761 | */ |
894b8788 | 2762 | static void __slab_free(struct kmem_cache *s, struct page *page, |
81084651 JDB |
2763 | void *head, void *tail, int cnt, |
2764 | unsigned long addr) | |
2765 | ||
81819f0f CL |
2766 | { |
2767 | void *prior; | |
2cfb7455 | 2768 | int was_frozen; |
2cfb7455 CL |
2769 | struct page new; |
2770 | unsigned long counters; | |
2771 | struct kmem_cache_node *n = NULL; | |
61728d1e | 2772 | unsigned long uninitialized_var(flags); |
81819f0f | 2773 | |
8a5ec0ba | 2774 | stat(s, FREE_SLOWPATH); |
81819f0f | 2775 | |
19c7ff9e | 2776 | if (kmem_cache_debug(s) && |
282acb43 | 2777 | !free_debug_processing(s, page, head, tail, cnt, addr)) |
80f08c19 | 2778 | return; |
6446faa2 | 2779 | |
2cfb7455 | 2780 | do { |
837d678d JK |
2781 | if (unlikely(n)) { |
2782 | spin_unlock_irqrestore(&n->list_lock, flags); | |
2783 | n = NULL; | |
2784 | } | |
2cfb7455 CL |
2785 | prior = page->freelist; |
2786 | counters = page->counters; | |
81084651 | 2787 | set_freepointer(s, tail, prior); |
2cfb7455 CL |
2788 | new.counters = counters; |
2789 | was_frozen = new.frozen; | |
81084651 | 2790 | new.inuse -= cnt; |
837d678d | 2791 | if ((!new.inuse || !prior) && !was_frozen) { |
49e22585 | 2792 | |
c65c1877 | 2793 | if (kmem_cache_has_cpu_partial(s) && !prior) { |
49e22585 CL |
2794 | |
2795 | /* | |
d0e0ac97 CG |
2796 | * Slab was on no list before and will be |
2797 | * partially empty | |
2798 | * We can defer the list move and instead | |
2799 | * freeze it. | |
49e22585 CL |
2800 | */ |
2801 | new.frozen = 1; | |
2802 | ||
c65c1877 | 2803 | } else { /* Needs to be taken off a list */ |
49e22585 | 2804 | |
b455def2 | 2805 | n = get_node(s, page_to_nid(page)); |
49e22585 CL |
2806 | /* |
2807 | * Speculatively acquire the list_lock. | |
2808 | * If the cmpxchg does not succeed then we may | |
2809 | * drop the list_lock without any processing. | |
2810 | * | |
2811 | * Otherwise the list_lock will synchronize with | |
2812 | * other processors updating the list of slabs. | |
2813 | */ | |
2814 | spin_lock_irqsave(&n->list_lock, flags); | |
2815 | ||
2816 | } | |
2cfb7455 | 2817 | } |
81819f0f | 2818 | |
2cfb7455 CL |
2819 | } while (!cmpxchg_double_slab(s, page, |
2820 | prior, counters, | |
81084651 | 2821 | head, new.counters, |
2cfb7455 | 2822 | "__slab_free")); |
81819f0f | 2823 | |
2cfb7455 | 2824 | if (likely(!n)) { |
49e22585 CL |
2825 | |
2826 | /* | |
2827 | * If we just froze the page then put it onto the | |
2828 | * per cpu partial list. | |
2829 | */ | |
8028dcea | 2830 | if (new.frozen && !was_frozen) { |
49e22585 | 2831 | put_cpu_partial(s, page, 1); |
8028dcea AS |
2832 | stat(s, CPU_PARTIAL_FREE); |
2833 | } | |
49e22585 | 2834 | /* |
2cfb7455 CL |
2835 | * The list lock was not taken therefore no list |
2836 | * activity can be necessary. | |
2837 | */ | |
b455def2 L |
2838 | if (was_frozen) |
2839 | stat(s, FREE_FROZEN); | |
2840 | return; | |
2841 | } | |
81819f0f | 2842 | |
8a5b20ae | 2843 | if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) |
837d678d JK |
2844 | goto slab_empty; |
2845 | ||
81819f0f | 2846 | /* |
837d678d JK |
2847 | * Objects left in the slab. If it was not on the partial list before |
2848 | * then add it. | |
81819f0f | 2849 | */ |
345c905d JK |
2850 | if (!kmem_cache_has_cpu_partial(s) && unlikely(!prior)) { |
2851 | if (kmem_cache_debug(s)) | |
c65c1877 | 2852 | remove_full(s, n, page); |
837d678d JK |
2853 | add_partial(n, page, DEACTIVATE_TO_TAIL); |
2854 | stat(s, FREE_ADD_PARTIAL); | |
8ff12cfc | 2855 | } |
80f08c19 | 2856 | spin_unlock_irqrestore(&n->list_lock, flags); |
81819f0f CL |
2857 | return; |
2858 | ||
2859 | slab_empty: | |
a973e9dd | 2860 | if (prior) { |
81819f0f | 2861 | /* |
6fbabb20 | 2862 | * Slab on the partial list. |
81819f0f | 2863 | */ |
5cc6eee8 | 2864 | remove_partial(n, page); |
84e554e6 | 2865 | stat(s, FREE_REMOVE_PARTIAL); |
c65c1877 | 2866 | } else { |
6fbabb20 | 2867 | /* Slab must be on the full list */ |
c65c1877 PZ |
2868 | remove_full(s, n, page); |
2869 | } | |
2cfb7455 | 2870 | |
80f08c19 | 2871 | spin_unlock_irqrestore(&n->list_lock, flags); |
84e554e6 | 2872 | stat(s, FREE_SLAB); |
81819f0f | 2873 | discard_slab(s, page); |
81819f0f CL |
2874 | } |
2875 | ||
894b8788 CL |
2876 | /* |
2877 | * Fastpath with forced inlining to produce a kfree and kmem_cache_free that | |
2878 | * can perform fastpath freeing without additional function calls. | |
2879 | * | |
2880 | * The fastpath is only possible if we are freeing to the current cpu slab | |
2881 | * of this processor. This typically the case if we have just allocated | |
2882 | * the item before. | |
2883 | * | |
2884 | * If fastpath is not possible then fall back to __slab_free where we deal | |
2885 | * with all sorts of special processing. | |
81084651 JDB |
2886 | * |
2887 | * Bulk free of a freelist with several objects (all pointing to the | |
2888 | * same page) possible by specifying head and tail ptr, plus objects | |
2889 | * count (cnt). Bulk free indicated by tail pointer being set. | |
894b8788 | 2890 | */ |
80a9201a AP |
2891 | static __always_inline void do_slab_free(struct kmem_cache *s, |
2892 | struct page *page, void *head, void *tail, | |
2893 | int cnt, unsigned long addr) | |
894b8788 | 2894 | { |
81084651 | 2895 | void *tail_obj = tail ? : head; |
dfb4f096 | 2896 | struct kmem_cache_cpu *c; |
8a5ec0ba | 2897 | unsigned long tid; |
8a5ec0ba CL |
2898 | redo: |
2899 | /* | |
2900 | * Determine the currently cpus per cpu slab. | |
2901 | * The cpu may change afterward. However that does not matter since | |
2902 | * data is retrieved via this pointer. If we are on the same cpu | |
2ae44005 | 2903 | * during the cmpxchg then the free will succeed. |
8a5ec0ba | 2904 | */ |
9aabf810 JK |
2905 | do { |
2906 | tid = this_cpu_read(s->cpu_slab->tid); | |
2907 | c = raw_cpu_ptr(s->cpu_slab); | |
859b7a0e MR |
2908 | } while (IS_ENABLED(CONFIG_PREEMPT) && |
2909 | unlikely(tid != READ_ONCE(c->tid))); | |
c016b0bd | 2910 | |
9aabf810 JK |
2911 | /* Same with comment on barrier() in slab_alloc_node() */ |
2912 | barrier(); | |
c016b0bd | 2913 | |
442b06bc | 2914 | if (likely(page == c->page)) { |
81084651 | 2915 | set_freepointer(s, tail_obj, c->freelist); |
8a5ec0ba | 2916 | |
933393f5 | 2917 | if (unlikely(!this_cpu_cmpxchg_double( |
8a5ec0ba CL |
2918 | s->cpu_slab->freelist, s->cpu_slab->tid, |
2919 | c->freelist, tid, | |
81084651 | 2920 | head, next_tid(tid)))) { |
8a5ec0ba CL |
2921 | |
2922 | note_cmpxchg_failure("slab_free", s, tid); | |
2923 | goto redo; | |
2924 | } | |
84e554e6 | 2925 | stat(s, FREE_FASTPATH); |
894b8788 | 2926 | } else |
81084651 | 2927 | __slab_free(s, page, head, tail_obj, cnt, addr); |
894b8788 | 2928 | |
894b8788 CL |
2929 | } |
2930 | ||
80a9201a AP |
2931 | static __always_inline void slab_free(struct kmem_cache *s, struct page *page, |
2932 | void *head, void *tail, int cnt, | |
2933 | unsigned long addr) | |
2934 | { | |
2935 | slab_free_freelist_hook(s, head, tail); | |
2936 | /* | |
2937 | * slab_free_freelist_hook() could have put the items into quarantine. | |
2938 | * If so, no need to free them. | |
2939 | */ | |
2940 | if (s->flags & SLAB_KASAN && !(s->flags & SLAB_DESTROY_BY_RCU)) | |
2941 | return; | |
2942 | do_slab_free(s, page, head, tail, cnt, addr); | |
2943 | } | |
2944 | ||
2945 | #ifdef CONFIG_KASAN | |
2946 | void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr) | |
2947 | { | |
2948 | do_slab_free(cache, virt_to_head_page(x), x, NULL, 1, addr); | |
2949 | } | |
2950 | #endif | |
2951 | ||
81819f0f CL |
2952 | void kmem_cache_free(struct kmem_cache *s, void *x) |
2953 | { | |
b9ce5ef4 GC |
2954 | s = cache_from_obj(s, x); |
2955 | if (!s) | |
79576102 | 2956 | return; |
81084651 | 2957 | slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_); |
ca2b84cb | 2958 | trace_kmem_cache_free(_RET_IP_, x); |
81819f0f CL |
2959 | } |
2960 | EXPORT_SYMBOL(kmem_cache_free); | |
2961 | ||
d0ecd894 | 2962 | struct detached_freelist { |
fbd02630 | 2963 | struct page *page; |
d0ecd894 JDB |
2964 | void *tail; |
2965 | void *freelist; | |
2966 | int cnt; | |
376bf125 | 2967 | struct kmem_cache *s; |
d0ecd894 | 2968 | }; |
fbd02630 | 2969 | |
d0ecd894 JDB |
2970 | /* |
2971 | * This function progressively scans the array with free objects (with | |
2972 | * a limited look ahead) and extract objects belonging to the same | |
2973 | * page. It builds a detached freelist directly within the given | |
2974 | * page/objects. This can happen without any need for | |
2975 | * synchronization, because the objects are owned by running process. | |
2976 | * The freelist is build up as a single linked list in the objects. | |
2977 | * The idea is, that this detached freelist can then be bulk | |
2978 | * transferred to the real freelist(s), but only requiring a single | |
2979 | * synchronization primitive. Look ahead in the array is limited due | |
2980 | * to performance reasons. | |
2981 | */ | |
376bf125 JDB |
2982 | static inline |
2983 | int build_detached_freelist(struct kmem_cache *s, size_t size, | |
2984 | void **p, struct detached_freelist *df) | |
d0ecd894 JDB |
2985 | { |
2986 | size_t first_skipped_index = 0; | |
2987 | int lookahead = 3; | |
2988 | void *object; | |
ca257195 | 2989 | struct page *page; |
fbd02630 | 2990 | |
d0ecd894 JDB |
2991 | /* Always re-init detached_freelist */ |
2992 | df->page = NULL; | |
fbd02630 | 2993 | |
d0ecd894 JDB |
2994 | do { |
2995 | object = p[--size]; | |
ca257195 | 2996 | /* Do we need !ZERO_OR_NULL_PTR(object) here? (for kfree) */ |
d0ecd894 | 2997 | } while (!object && size); |
3eed034d | 2998 | |
d0ecd894 JDB |
2999 | if (!object) |
3000 | return 0; | |
fbd02630 | 3001 | |
ca257195 JDB |
3002 | page = virt_to_head_page(object); |
3003 | if (!s) { | |
3004 | /* Handle kalloc'ed objects */ | |
3005 | if (unlikely(!PageSlab(page))) { | |
3006 | BUG_ON(!PageCompound(page)); | |
3007 | kfree_hook(object); | |
4949148a | 3008 | __free_pages(page, compound_order(page)); |
ca257195 JDB |
3009 | p[size] = NULL; /* mark object processed */ |
3010 | return size; | |
3011 | } | |
3012 | /* Derive kmem_cache from object */ | |
3013 | df->s = page->slab_cache; | |
3014 | } else { | |
3015 | df->s = cache_from_obj(s, object); /* Support for memcg */ | |
3016 | } | |
376bf125 | 3017 | |
d0ecd894 | 3018 | /* Start new detached freelist */ |
ca257195 | 3019 | df->page = page; |
376bf125 | 3020 | set_freepointer(df->s, object, NULL); |
d0ecd894 JDB |
3021 | df->tail = object; |
3022 | df->freelist = object; | |
3023 | p[size] = NULL; /* mark object processed */ | |
3024 | df->cnt = 1; | |
3025 | ||
3026 | while (size) { | |
3027 | object = p[--size]; | |
3028 | if (!object) | |
3029 | continue; /* Skip processed objects */ | |
3030 | ||
3031 | /* df->page is always set at this point */ | |
3032 | if (df->page == virt_to_head_page(object)) { | |
3033 | /* Opportunity build freelist */ | |
376bf125 | 3034 | set_freepointer(df->s, object, df->freelist); |
d0ecd894 JDB |
3035 | df->freelist = object; |
3036 | df->cnt++; | |
3037 | p[size] = NULL; /* mark object processed */ | |
3038 | ||
3039 | continue; | |
fbd02630 | 3040 | } |
d0ecd894 JDB |
3041 | |
3042 | /* Limit look ahead search */ | |
3043 | if (!--lookahead) | |
3044 | break; | |
3045 | ||
3046 | if (!first_skipped_index) | |
3047 | first_skipped_index = size + 1; | |
fbd02630 | 3048 | } |
d0ecd894 JDB |
3049 | |
3050 | return first_skipped_index; | |
3051 | } | |
3052 | ||
d0ecd894 | 3053 | /* Note that interrupts must be enabled when calling this function. */ |
376bf125 | 3054 | void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p) |
d0ecd894 JDB |
3055 | { |
3056 | if (WARN_ON(!size)) | |
3057 | return; | |
3058 | ||
3059 | do { | |
3060 | struct detached_freelist df; | |
3061 | ||
3062 | size = build_detached_freelist(s, size, p, &df); | |
3063 | if (unlikely(!df.page)) | |
3064 | continue; | |
3065 | ||
376bf125 | 3066 | slab_free(df.s, df.page, df.freelist, df.tail, df.cnt,_RET_IP_); |
d0ecd894 | 3067 | } while (likely(size)); |
484748f0 CL |
3068 | } |
3069 | EXPORT_SYMBOL(kmem_cache_free_bulk); | |
3070 | ||
994eb764 | 3071 | /* Note that interrupts must be enabled when calling this function. */ |
865762a8 JDB |
3072 | int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, |
3073 | void **p) | |
484748f0 | 3074 | { |
994eb764 JDB |
3075 | struct kmem_cache_cpu *c; |
3076 | int i; | |
3077 | ||
03ec0ed5 JDB |
3078 | /* memcg and kmem_cache debug support */ |
3079 | s = slab_pre_alloc_hook(s, flags); | |
3080 | if (unlikely(!s)) | |
3081 | return false; | |
994eb764 JDB |
3082 | /* |
3083 | * Drain objects in the per cpu slab, while disabling local | |
3084 | * IRQs, which protects against PREEMPT and interrupts | |
3085 | * handlers invoking normal fastpath. | |
3086 | */ | |
3087 | local_irq_disable(); | |
3088 | c = this_cpu_ptr(s->cpu_slab); | |
3089 | ||
3090 | for (i = 0; i < size; i++) { | |
3091 | void *object = c->freelist; | |
3092 | ||
ebe909e0 | 3093 | if (unlikely(!object)) { |
ebe909e0 JDB |
3094 | /* |
3095 | * Invoking slow path likely have side-effect | |
3096 | * of re-populating per CPU c->freelist | |
3097 | */ | |
87098373 | 3098 | p[i] = ___slab_alloc(s, flags, NUMA_NO_NODE, |
ebe909e0 | 3099 | _RET_IP_, c); |
87098373 CL |
3100 | if (unlikely(!p[i])) |
3101 | goto error; | |
3102 | ||
ebe909e0 JDB |
3103 | c = this_cpu_ptr(s->cpu_slab); |
3104 | continue; /* goto for-loop */ | |
3105 | } | |
994eb764 JDB |
3106 | c->freelist = get_freepointer(s, object); |
3107 | p[i] = object; | |
3108 | } | |
3109 | c->tid = next_tid(c->tid); | |
3110 | local_irq_enable(); | |
3111 | ||
3112 | /* Clear memory outside IRQ disabled fastpath loop */ | |
3113 | if (unlikely(flags & __GFP_ZERO)) { | |
3114 | int j; | |
3115 | ||
3116 | for (j = 0; j < i; j++) | |
3117 | memset(p[j], 0, s->object_size); | |
3118 | } | |
3119 | ||
03ec0ed5 JDB |
3120 | /* memcg and kmem_cache debug support */ |
3121 | slab_post_alloc_hook(s, flags, size, p); | |
865762a8 | 3122 | return i; |
87098373 | 3123 | error: |
87098373 | 3124 | local_irq_enable(); |
03ec0ed5 JDB |
3125 | slab_post_alloc_hook(s, flags, i, p); |
3126 | __kmem_cache_free_bulk(s, i, p); | |
865762a8 | 3127 | return 0; |
484748f0 CL |
3128 | } |
3129 | EXPORT_SYMBOL(kmem_cache_alloc_bulk); | |
3130 | ||
3131 | ||
81819f0f | 3132 | /* |
672bba3a CL |
3133 | * Object placement in a slab is made very easy because we always start at |
3134 | * offset 0. If we tune the size of the object to the alignment then we can | |
3135 | * get the required alignment by putting one properly sized object after | |
3136 | * another. | |
81819f0f CL |
3137 | * |
3138 | * Notice that the allocation order determines the sizes of the per cpu | |
3139 | * caches. Each processor has always one slab available for allocations. | |
3140 | * Increasing the allocation order reduces the number of times that slabs | |
672bba3a | 3141 | * must be moved on and off the partial lists and is therefore a factor in |
81819f0f | 3142 | * locking overhead. |
81819f0f CL |
3143 | */ |
3144 | ||
3145 | /* | |
3146 | * Mininum / Maximum order of slab pages. This influences locking overhead | |
3147 | * and slab fragmentation. A higher order reduces the number of partial slabs | |
3148 | * and increases the number of allocations possible without having to | |
3149 | * take the list_lock. | |
3150 | */ | |
3151 | static int slub_min_order; | |
114e9e89 | 3152 | static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; |
9b2cd506 | 3153 | static int slub_min_objects; |
81819f0f | 3154 | |
81819f0f CL |
3155 | /* |
3156 | * Calculate the order of allocation given an slab object size. | |
3157 | * | |
672bba3a CL |
3158 | * The order of allocation has significant impact on performance and other |
3159 | * system components. Generally order 0 allocations should be preferred since | |
3160 | * order 0 does not cause fragmentation in the page allocator. Larger objects | |
3161 | * be problematic to put into order 0 slabs because there may be too much | |
c124f5b5 | 3162 | * unused space left. We go to a higher order if more than 1/16th of the slab |
672bba3a CL |
3163 | * would be wasted. |
3164 | * | |
3165 | * In order to reach satisfactory performance we must ensure that a minimum | |
3166 | * number of objects is in one slab. Otherwise we may generate too much | |
3167 | * activity on the partial lists which requires taking the list_lock. This is | |
3168 | * less a concern for large slabs though which are rarely used. | |
81819f0f | 3169 | * |
672bba3a CL |
3170 | * slub_max_order specifies the order where we begin to stop considering the |
3171 | * number of objects in a slab as critical. If we reach slub_max_order then | |
3172 | * we try to keep the page order as low as possible. So we accept more waste | |
3173 | * of space in favor of a small page order. | |
81819f0f | 3174 | * |
672bba3a CL |
3175 | * Higher order allocations also allow the placement of more objects in a |
3176 | * slab and thereby reduce object handling overhead. If the user has | |
3177 | * requested a higher mininum order then we start with that one instead of | |
3178 | * the smallest order which will fit the object. | |
81819f0f | 3179 | */ |
5e6d444e | 3180 | static inline int slab_order(int size, int min_objects, |
ab9a0f19 | 3181 | int max_order, int fract_leftover, int reserved) |
81819f0f CL |
3182 | { |
3183 | int order; | |
3184 | int rem; | |
6300ea75 | 3185 | int min_order = slub_min_order; |
81819f0f | 3186 | |
ab9a0f19 | 3187 | if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE) |
210b5c06 | 3188 | return get_order(size * MAX_OBJS_PER_PAGE) - 1; |
39b26464 | 3189 | |
9f835703 | 3190 | for (order = max(min_order, get_order(min_objects * size + reserved)); |
5e6d444e | 3191 | order <= max_order; order++) { |
81819f0f | 3192 | |
5e6d444e | 3193 | unsigned long slab_size = PAGE_SIZE << order; |
81819f0f | 3194 | |
ab9a0f19 | 3195 | rem = (slab_size - reserved) % size; |
81819f0f | 3196 | |
5e6d444e | 3197 | if (rem <= slab_size / fract_leftover) |
81819f0f | 3198 | break; |
81819f0f | 3199 | } |
672bba3a | 3200 | |
81819f0f CL |
3201 | return order; |
3202 | } | |
3203 | ||
ab9a0f19 | 3204 | static inline int calculate_order(int size, int reserved) |
5e6d444e CL |
3205 | { |
3206 | int order; | |
3207 | int min_objects; | |
3208 | int fraction; | |
e8120ff1 | 3209 | int max_objects; |
5e6d444e CL |
3210 | |
3211 | /* | |
3212 | * Attempt to find best configuration for a slab. This | |
3213 | * works by first attempting to generate a layout with | |
3214 | * the best configuration and backing off gradually. | |
3215 | * | |
422ff4d7 | 3216 | * First we increase the acceptable waste in a slab. Then |
5e6d444e CL |
3217 | * we reduce the minimum objects required in a slab. |
3218 | */ | |
3219 | min_objects = slub_min_objects; | |
9b2cd506 CL |
3220 | if (!min_objects) |
3221 | min_objects = 4 * (fls(nr_cpu_ids) + 1); | |
ab9a0f19 | 3222 | max_objects = order_objects(slub_max_order, size, reserved); |
e8120ff1 ZY |
3223 | min_objects = min(min_objects, max_objects); |
3224 | ||
5e6d444e | 3225 | while (min_objects > 1) { |
c124f5b5 | 3226 | fraction = 16; |
5e6d444e CL |
3227 | while (fraction >= 4) { |
3228 | order = slab_order(size, min_objects, | |
ab9a0f19 | 3229 | slub_max_order, fraction, reserved); |
5e6d444e CL |
3230 | if (order <= slub_max_order) |
3231 | return order; | |
3232 | fraction /= 2; | |
3233 | } | |
5086c389 | 3234 | min_objects--; |
5e6d444e CL |
3235 | } |
3236 | ||
3237 | /* | |
3238 | * We were unable to place multiple objects in a slab. Now | |
3239 | * lets see if we can place a single object there. | |
3240 | */ | |
ab9a0f19 | 3241 | order = slab_order(size, 1, slub_max_order, 1, reserved); |
5e6d444e CL |
3242 | if (order <= slub_max_order) |
3243 | return order; | |
3244 | ||
3245 | /* | |
3246 | * Doh this slab cannot be placed using slub_max_order. | |
3247 | */ | |
ab9a0f19 | 3248 | order = slab_order(size, 1, MAX_ORDER, 1, reserved); |
818cf590 | 3249 | if (order < MAX_ORDER) |
5e6d444e CL |
3250 | return order; |
3251 | return -ENOSYS; | |
3252 | } | |
3253 | ||
5595cffc | 3254 | static void |
4053497d | 3255 | init_kmem_cache_node(struct kmem_cache_node *n) |
81819f0f CL |
3256 | { |
3257 | n->nr_partial = 0; | |
81819f0f CL |
3258 | spin_lock_init(&n->list_lock); |
3259 | INIT_LIST_HEAD(&n->partial); | |
8ab1372f | 3260 | #ifdef CONFIG_SLUB_DEBUG |
0f389ec6 | 3261 | atomic_long_set(&n->nr_slabs, 0); |
02b71b70 | 3262 | atomic_long_set(&n->total_objects, 0); |
643b1138 | 3263 | INIT_LIST_HEAD(&n->full); |
8ab1372f | 3264 | #endif |
81819f0f CL |
3265 | } |
3266 | ||
55136592 | 3267 | static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) |
4c93c355 | 3268 | { |
6c182dc0 | 3269 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < |
95a05b42 | 3270 | KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu)); |
4c93c355 | 3271 | |
8a5ec0ba | 3272 | /* |
d4d84fef CM |
3273 | * Must align to double word boundary for the double cmpxchg |
3274 | * instructions to work; see __pcpu_double_call_return_bool(). | |
8a5ec0ba | 3275 | */ |
d4d84fef CM |
3276 | s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), |
3277 | 2 * sizeof(void *)); | |
8a5ec0ba CL |
3278 | |
3279 | if (!s->cpu_slab) | |
3280 | return 0; | |
3281 | ||
3282 | init_kmem_cache_cpus(s); | |
4c93c355 | 3283 | |
8a5ec0ba | 3284 | return 1; |
4c93c355 | 3285 | } |
4c93c355 | 3286 | |
51df1142 CL |
3287 | static struct kmem_cache *kmem_cache_node; |
3288 | ||
81819f0f CL |
3289 | /* |
3290 | * No kmalloc_node yet so do it by hand. We know that this is the first | |
3291 | * slab on the node for this slabcache. There are no concurrent accesses | |
3292 | * possible. | |
3293 | * | |
721ae22a ZYW |
3294 | * Note that this function only works on the kmem_cache_node |
3295 | * when allocating for the kmem_cache_node. This is used for bootstrapping | |
4c93c355 | 3296 | * memory on a fresh node that has no slab structures yet. |
81819f0f | 3297 | */ |
55136592 | 3298 | static void early_kmem_cache_node_alloc(int node) |
81819f0f CL |
3299 | { |
3300 | struct page *page; | |
3301 | struct kmem_cache_node *n; | |
3302 | ||
51df1142 | 3303 | BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node)); |
81819f0f | 3304 | |
51df1142 | 3305 | page = new_slab(kmem_cache_node, GFP_NOWAIT, node); |
81819f0f CL |
3306 | |
3307 | BUG_ON(!page); | |
a2f92ee7 | 3308 | if (page_to_nid(page) != node) { |
f9f58285 FF |
3309 | pr_err("SLUB: Unable to allocate memory from node %d\n", node); |
3310 | pr_err("SLUB: Allocating a useless per node structure in order to be able to continue\n"); | |
a2f92ee7 CL |
3311 | } |
3312 | ||
81819f0f CL |
3313 | n = page->freelist; |
3314 | BUG_ON(!n); | |
51df1142 | 3315 | page->freelist = get_freepointer(kmem_cache_node, n); |
e6e82ea1 | 3316 | page->inuse = 1; |
8cb0a506 | 3317 | page->frozen = 0; |
51df1142 | 3318 | kmem_cache_node->node[node] = n; |
8ab1372f | 3319 | #ifdef CONFIG_SLUB_DEBUG |
f7cb1933 | 3320 | init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); |
51df1142 | 3321 | init_tracking(kmem_cache_node, n); |
8ab1372f | 3322 | #endif |
505f5dcb AP |
3323 | kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node), |
3324 | GFP_KERNEL); | |
4053497d | 3325 | init_kmem_cache_node(n); |
51df1142 | 3326 | inc_slabs_node(kmem_cache_node, node, page->objects); |
6446faa2 | 3327 | |
67b6c900 | 3328 | /* |
1e4dd946 SR |
3329 | * No locks need to be taken here as it has just been |
3330 | * initialized and there is no concurrent access. | |
67b6c900 | 3331 | */ |
1e4dd946 | 3332 | __add_partial(n, page, DEACTIVATE_TO_HEAD); |
81819f0f CL |
3333 | } |
3334 | ||
3335 | static void free_kmem_cache_nodes(struct kmem_cache *s) | |
3336 | { | |
3337 | int node; | |
fa45dc25 | 3338 | struct kmem_cache_node *n; |
81819f0f | 3339 | |
fa45dc25 CL |
3340 | for_each_kmem_cache_node(s, node, n) { |
3341 | kmem_cache_free(kmem_cache_node, n); | |
81819f0f CL |
3342 | s->node[node] = NULL; |
3343 | } | |
3344 | } | |
3345 | ||
52b4b950 DS |
3346 | void __kmem_cache_release(struct kmem_cache *s) |
3347 | { | |
210e7a43 | 3348 | cache_random_seq_destroy(s); |
52b4b950 DS |
3349 | free_percpu(s->cpu_slab); |
3350 | free_kmem_cache_nodes(s); | |
3351 | } | |
3352 | ||
55136592 | 3353 | static int init_kmem_cache_nodes(struct kmem_cache *s) |
81819f0f CL |
3354 | { |
3355 | int node; | |
81819f0f | 3356 | |
f64dc58c | 3357 | for_each_node_state(node, N_NORMAL_MEMORY) { |
81819f0f CL |
3358 | struct kmem_cache_node *n; |
3359 | ||
73367bd8 | 3360 | if (slab_state == DOWN) { |
55136592 | 3361 | early_kmem_cache_node_alloc(node); |
73367bd8 AD |
3362 | continue; |
3363 | } | |
51df1142 | 3364 | n = kmem_cache_alloc_node(kmem_cache_node, |
55136592 | 3365 | GFP_KERNEL, node); |
81819f0f | 3366 | |
73367bd8 AD |
3367 | if (!n) { |
3368 | free_kmem_cache_nodes(s); | |
3369 | return 0; | |
81819f0f | 3370 | } |
73367bd8 | 3371 | |
81819f0f | 3372 | s->node[node] = n; |
4053497d | 3373 | init_kmem_cache_node(n); |
81819f0f CL |
3374 | } |
3375 | return 1; | |
3376 | } | |
81819f0f | 3377 | |
c0bdb232 | 3378 | static void set_min_partial(struct kmem_cache *s, unsigned long min) |
3b89d7d8 DR |
3379 | { |
3380 | if (min < MIN_PARTIAL) | |
3381 | min = MIN_PARTIAL; | |
3382 | else if (min > MAX_PARTIAL) | |
3383 | min = MAX_PARTIAL; | |
3384 | s->min_partial = min; | |
3385 | } | |
3386 | ||
81819f0f CL |
3387 | /* |
3388 | * calculate_sizes() determines the order and the distribution of data within | |
3389 | * a slab object. | |
3390 | */ | |
06b285dc | 3391 | static int calculate_sizes(struct kmem_cache *s, int forced_order) |
81819f0f CL |
3392 | { |
3393 | unsigned long flags = s->flags; | |
80a9201a | 3394 | size_t size = s->object_size; |
834f3d11 | 3395 | int order; |
81819f0f | 3396 | |
d8b42bf5 CL |
3397 | /* |
3398 | * Round up object size to the next word boundary. We can only | |
3399 | * place the free pointer at word boundaries and this determines | |
3400 | * the possible location of the free pointer. | |
3401 | */ | |
3402 | size = ALIGN(size, sizeof(void *)); | |
3403 | ||
3404 | #ifdef CONFIG_SLUB_DEBUG | |
81819f0f CL |
3405 | /* |
3406 | * Determine if we can poison the object itself. If the user of | |
3407 | * the slab may touch the object after free or before allocation | |
3408 | * then we should never poison the object itself. | |
3409 | */ | |
3410 | if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) && | |
c59def9f | 3411 | !s->ctor) |
81819f0f CL |
3412 | s->flags |= __OBJECT_POISON; |
3413 | else | |
3414 | s->flags &= ~__OBJECT_POISON; | |
3415 | ||
81819f0f CL |
3416 | |
3417 | /* | |
672bba3a | 3418 | * If we are Redzoning then check if there is some space between the |
81819f0f | 3419 | * end of the object and the free pointer. If not then add an |
672bba3a | 3420 | * additional word to have some bytes to store Redzone information. |
81819f0f | 3421 | */ |
3b0efdfa | 3422 | if ((flags & SLAB_RED_ZONE) && size == s->object_size) |
81819f0f | 3423 | size += sizeof(void *); |
41ecc55b | 3424 | #endif |
81819f0f CL |
3425 | |
3426 | /* | |
672bba3a CL |
3427 | * With that we have determined the number of bytes in actual use |
3428 | * by the object. This is the potential offset to the free pointer. | |
81819f0f CL |
3429 | */ |
3430 | s->inuse = size; | |
3431 | ||
3432 | if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) || | |
c59def9f | 3433 | s->ctor)) { |
81819f0f CL |
3434 | /* |
3435 | * Relocate free pointer after the object if it is not | |
3436 | * permitted to overwrite the first word of the object on | |
3437 | * kmem_cache_free. | |
3438 | * | |
3439 | * This is the case if we do RCU, have a constructor or | |
3440 | * destructor or are poisoning the objects. | |
3441 | */ | |
3442 | s->offset = size; | |
3443 | size += sizeof(void *); | |
3444 | } | |
3445 | ||
c12b3c62 | 3446 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f CL |
3447 | if (flags & SLAB_STORE_USER) |
3448 | /* | |
3449 | * Need to store information about allocs and frees after | |
3450 | * the object. | |
3451 | */ | |
3452 | size += 2 * sizeof(struct track); | |
80a9201a | 3453 | #endif |
81819f0f | 3454 | |
80a9201a AP |
3455 | kasan_cache_create(s, &size, &s->flags); |
3456 | #ifdef CONFIG_SLUB_DEBUG | |
d86bd1be | 3457 | if (flags & SLAB_RED_ZONE) { |
81819f0f CL |
3458 | /* |
3459 | * Add some empty padding so that we can catch | |
3460 | * overwrites from earlier objects rather than let | |
3461 | * tracking information or the free pointer be | |
0211a9c8 | 3462 | * corrupted if a user writes before the start |
81819f0f CL |
3463 | * of the object. |
3464 | */ | |
3465 | size += sizeof(void *); | |
d86bd1be JK |
3466 | |
3467 | s->red_left_pad = sizeof(void *); | |
3468 | s->red_left_pad = ALIGN(s->red_left_pad, s->align); | |
3469 | size += s->red_left_pad; | |
3470 | } | |
41ecc55b | 3471 | #endif |
672bba3a | 3472 | |
81819f0f CL |
3473 | /* |
3474 | * SLUB stores one object immediately after another beginning from | |
3475 | * offset 0. In order to align the objects we have to simply size | |
3476 | * each object to conform to the alignment. | |
3477 | */ | |
45906855 | 3478 | size = ALIGN(size, s->align); |
81819f0f | 3479 | s->size = size; |
06b285dc CL |
3480 | if (forced_order >= 0) |
3481 | order = forced_order; | |
3482 | else | |
ab9a0f19 | 3483 | order = calculate_order(size, s->reserved); |
81819f0f | 3484 | |
834f3d11 | 3485 | if (order < 0) |
81819f0f CL |
3486 | return 0; |
3487 | ||
b7a49f0d | 3488 | s->allocflags = 0; |
834f3d11 | 3489 | if (order) |
b7a49f0d CL |
3490 | s->allocflags |= __GFP_COMP; |
3491 | ||
3492 | if (s->flags & SLAB_CACHE_DMA) | |
2c59dd65 | 3493 | s->allocflags |= GFP_DMA; |
b7a49f0d CL |
3494 | |
3495 | if (s->flags & SLAB_RECLAIM_ACCOUNT) | |
3496 | s->allocflags |= __GFP_RECLAIMABLE; | |
3497 | ||
81819f0f CL |
3498 | /* |
3499 | * Determine the number of objects per slab | |
3500 | */ | |
ab9a0f19 LJ |
3501 | s->oo = oo_make(order, size, s->reserved); |
3502 | s->min = oo_make(get_order(size), size, s->reserved); | |
205ab99d CL |
3503 | if (oo_objects(s->oo) > oo_objects(s->max)) |
3504 | s->max = s->oo; | |
81819f0f | 3505 | |
834f3d11 | 3506 | return !!oo_objects(s->oo); |
81819f0f CL |
3507 | } |
3508 | ||
8a13a4cc | 3509 | static int kmem_cache_open(struct kmem_cache *s, unsigned long flags) |
81819f0f | 3510 | { |
8a13a4cc | 3511 | s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor); |
ab9a0f19 | 3512 | s->reserved = 0; |
81819f0f | 3513 | |
da9a638c LJ |
3514 | if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU)) |
3515 | s->reserved = sizeof(struct rcu_head); | |
81819f0f | 3516 | |
06b285dc | 3517 | if (!calculate_sizes(s, -1)) |
81819f0f | 3518 | goto error; |
3de47213 DR |
3519 | if (disable_higher_order_debug) { |
3520 | /* | |
3521 | * Disable debugging flags that store metadata if the min slab | |
3522 | * order increased. | |
3523 | */ | |
3b0efdfa | 3524 | if (get_order(s->size) > get_order(s->object_size)) { |
3de47213 DR |
3525 | s->flags &= ~DEBUG_METADATA_FLAGS; |
3526 | s->offset = 0; | |
3527 | if (!calculate_sizes(s, -1)) | |
3528 | goto error; | |
3529 | } | |
3530 | } | |
81819f0f | 3531 | |
2565409f HC |
3532 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
3533 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
149daaf3 | 3534 | if (system_has_cmpxchg_double() && (s->flags & SLAB_NO_CMPXCHG) == 0) |
b789ef51 CL |
3535 | /* Enable fast mode */ |
3536 | s->flags |= __CMPXCHG_DOUBLE; | |
3537 | #endif | |
3538 | ||
3b89d7d8 DR |
3539 | /* |
3540 | * The larger the object size is, the more pages we want on the partial | |
3541 | * list to avoid pounding the page allocator excessively. | |
3542 | */ | |
49e22585 CL |
3543 | set_min_partial(s, ilog2(s->size) / 2); |
3544 | ||
3545 | /* | |
3546 | * cpu_partial determined the maximum number of objects kept in the | |
3547 | * per cpu partial lists of a processor. | |
3548 | * | |
3549 | * Per cpu partial lists mainly contain slabs that just have one | |
3550 | * object freed. If they are used for allocation then they can be | |
3551 | * filled up again with minimal effort. The slab will never hit the | |
3552 | * per node partial lists and therefore no locking will be required. | |
3553 | * | |
3554 | * This setting also determines | |
3555 | * | |
3556 | * A) The number of objects from per cpu partial slabs dumped to the | |
3557 | * per node list when we reach the limit. | |
9f264904 | 3558 | * B) The number of objects in cpu partial slabs to extract from the |
d0e0ac97 CG |
3559 | * per node list when we run out of per cpu objects. We only fetch |
3560 | * 50% to keep some capacity around for frees. | |
49e22585 | 3561 | */ |
345c905d | 3562 | if (!kmem_cache_has_cpu_partial(s)) |
8f1e33da CL |
3563 | s->cpu_partial = 0; |
3564 | else if (s->size >= PAGE_SIZE) | |
49e22585 CL |
3565 | s->cpu_partial = 2; |
3566 | else if (s->size >= 1024) | |
3567 | s->cpu_partial = 6; | |
3568 | else if (s->size >= 256) | |
3569 | s->cpu_partial = 13; | |
3570 | else | |
3571 | s->cpu_partial = 30; | |
3572 | ||
81819f0f | 3573 | #ifdef CONFIG_NUMA |
e2cb96b7 | 3574 | s->remote_node_defrag_ratio = 1000; |
81819f0f | 3575 | #endif |
210e7a43 TG |
3576 | |
3577 | /* Initialize the pre-computed randomized freelist if slab is up */ | |
3578 | if (slab_state >= UP) { | |
3579 | if (init_cache_random_seq(s)) | |
3580 | goto error; | |
3581 | } | |
3582 | ||
55136592 | 3583 | if (!init_kmem_cache_nodes(s)) |
dfb4f096 | 3584 | goto error; |
81819f0f | 3585 | |
55136592 | 3586 | if (alloc_kmem_cache_cpus(s)) |
278b1bb1 | 3587 | return 0; |
ff12059e | 3588 | |
4c93c355 | 3589 | free_kmem_cache_nodes(s); |
81819f0f CL |
3590 | error: |
3591 | if (flags & SLAB_PANIC) | |
756a025f JP |
3592 | panic("Cannot create slab %s size=%lu realsize=%u order=%u offset=%u flags=%lx\n", |
3593 | s->name, (unsigned long)s->size, s->size, | |
3594 | oo_order(s->oo), s->offset, flags); | |
278b1bb1 | 3595 | return -EINVAL; |
81819f0f | 3596 | } |
81819f0f | 3597 | |
33b12c38 CL |
3598 | static void list_slab_objects(struct kmem_cache *s, struct page *page, |
3599 | const char *text) | |
3600 | { | |
3601 | #ifdef CONFIG_SLUB_DEBUG | |
3602 | void *addr = page_address(page); | |
3603 | void *p; | |
a5dd5c11 NK |
3604 | unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) * |
3605 | sizeof(long), GFP_ATOMIC); | |
bbd7d57b ED |
3606 | if (!map) |
3607 | return; | |
945cf2b6 | 3608 | slab_err(s, page, text, s->name); |
33b12c38 | 3609 | slab_lock(page); |
33b12c38 | 3610 | |
5f80b13a | 3611 | get_map(s, page, map); |
33b12c38 CL |
3612 | for_each_object(p, s, addr, page->objects) { |
3613 | ||
3614 | if (!test_bit(slab_index(p, s, addr), map)) { | |
f9f58285 | 3615 | pr_err("INFO: Object 0x%p @offset=%tu\n", p, p - addr); |
33b12c38 CL |
3616 | print_tracking(s, p); |
3617 | } | |
3618 | } | |
3619 | slab_unlock(page); | |
bbd7d57b | 3620 | kfree(map); |
33b12c38 CL |
3621 | #endif |
3622 | } | |
3623 | ||
81819f0f | 3624 | /* |
599870b1 | 3625 | * Attempt to free all partial slabs on a node. |
52b4b950 DS |
3626 | * This is called from __kmem_cache_shutdown(). We must take list_lock |
3627 | * because sysfs file might still access partial list after the shutdowning. | |
81819f0f | 3628 | */ |
599870b1 | 3629 | static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) |
81819f0f | 3630 | { |
81819f0f CL |
3631 | struct page *page, *h; |
3632 | ||
52b4b950 DS |
3633 | BUG_ON(irqs_disabled()); |
3634 | spin_lock_irq(&n->list_lock); | |
33b12c38 | 3635 | list_for_each_entry_safe(page, h, &n->partial, lru) { |
81819f0f | 3636 | if (!page->inuse) { |
52b4b950 | 3637 | remove_partial(n, page); |
81819f0f | 3638 | discard_slab(s, page); |
33b12c38 CL |
3639 | } else { |
3640 | list_slab_objects(s, page, | |
52b4b950 | 3641 | "Objects remaining in %s on __kmem_cache_shutdown()"); |
599870b1 | 3642 | } |
33b12c38 | 3643 | } |
52b4b950 | 3644 | spin_unlock_irq(&n->list_lock); |
81819f0f CL |
3645 | } |
3646 | ||
3647 | /* | |
672bba3a | 3648 | * Release all resources used by a slab cache. |
81819f0f | 3649 | */ |
52b4b950 | 3650 | int __kmem_cache_shutdown(struct kmem_cache *s) |
81819f0f CL |
3651 | { |
3652 | int node; | |
fa45dc25 | 3653 | struct kmem_cache_node *n; |
81819f0f CL |
3654 | |
3655 | flush_all(s); | |
81819f0f | 3656 | /* Attempt to free all objects */ |
fa45dc25 | 3657 | for_each_kmem_cache_node(s, node, n) { |
599870b1 CL |
3658 | free_partial(s, n); |
3659 | if (n->nr_partial || slabs_node(s, node)) | |
81819f0f CL |
3660 | return 1; |
3661 | } | |
81819f0f CL |
3662 | return 0; |
3663 | } | |
3664 | ||
81819f0f CL |
3665 | /******************************************************************** |
3666 | * Kmalloc subsystem | |
3667 | *******************************************************************/ | |
3668 | ||
81819f0f CL |
3669 | static int __init setup_slub_min_order(char *str) |
3670 | { | |
06428780 | 3671 | get_option(&str, &slub_min_order); |
81819f0f CL |
3672 | |
3673 | return 1; | |
3674 | } | |
3675 | ||
3676 | __setup("slub_min_order=", setup_slub_min_order); | |
3677 | ||
3678 | static int __init setup_slub_max_order(char *str) | |
3679 | { | |
06428780 | 3680 | get_option(&str, &slub_max_order); |
818cf590 | 3681 | slub_max_order = min(slub_max_order, MAX_ORDER - 1); |
81819f0f CL |
3682 | |
3683 | return 1; | |
3684 | } | |
3685 | ||
3686 | __setup("slub_max_order=", setup_slub_max_order); | |
3687 | ||
3688 | static int __init setup_slub_min_objects(char *str) | |
3689 | { | |
06428780 | 3690 | get_option(&str, &slub_min_objects); |
81819f0f CL |
3691 | |
3692 | return 1; | |
3693 | } | |
3694 | ||
3695 | __setup("slub_min_objects=", setup_slub_min_objects); | |
3696 | ||
81819f0f CL |
3697 | void *__kmalloc(size_t size, gfp_t flags) |
3698 | { | |
aadb4bc4 | 3699 | struct kmem_cache *s; |
5b882be4 | 3700 | void *ret; |
81819f0f | 3701 | |
95a05b42 | 3702 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
eada35ef | 3703 | return kmalloc_large(size, flags); |
aadb4bc4 | 3704 | |
2c59dd65 | 3705 | s = kmalloc_slab(size, flags); |
aadb4bc4 CL |
3706 | |
3707 | if (unlikely(ZERO_OR_NULL_PTR(s))) | |
6cb8f913 CL |
3708 | return s; |
3709 | ||
2b847c3c | 3710 | ret = slab_alloc(s, flags, _RET_IP_); |
5b882be4 | 3711 | |
ca2b84cb | 3712 | trace_kmalloc(_RET_IP_, ret, size, s->size, flags); |
5b882be4 | 3713 | |
505f5dcb | 3714 | kasan_kmalloc(s, ret, size, flags); |
0316bec2 | 3715 | |
5b882be4 | 3716 | return ret; |
81819f0f CL |
3717 | } |
3718 | EXPORT_SYMBOL(__kmalloc); | |
3719 | ||
5d1f57e4 | 3720 | #ifdef CONFIG_NUMA |
f619cfe1 CL |
3721 | static void *kmalloc_large_node(size_t size, gfp_t flags, int node) |
3722 | { | |
b1eeab67 | 3723 | struct page *page; |
e4f7c0b4 | 3724 | void *ptr = NULL; |
f619cfe1 | 3725 | |
52383431 | 3726 | flags |= __GFP_COMP | __GFP_NOTRACK; |
4949148a | 3727 | page = alloc_pages_node(node, flags, get_order(size)); |
f619cfe1 | 3728 | if (page) |
e4f7c0b4 CM |
3729 | ptr = page_address(page); |
3730 | ||
d56791b3 | 3731 | kmalloc_large_node_hook(ptr, size, flags); |
e4f7c0b4 | 3732 | return ptr; |
f619cfe1 CL |
3733 | } |
3734 | ||
81819f0f CL |
3735 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
3736 | { | |
aadb4bc4 | 3737 | struct kmem_cache *s; |
5b882be4 | 3738 | void *ret; |
81819f0f | 3739 | |
95a05b42 | 3740 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
5b882be4 EGM |
3741 | ret = kmalloc_large_node(size, flags, node); |
3742 | ||
ca2b84cb EGM |
3743 | trace_kmalloc_node(_RET_IP_, ret, |
3744 | size, PAGE_SIZE << get_order(size), | |
3745 | flags, node); | |
5b882be4 EGM |
3746 | |
3747 | return ret; | |
3748 | } | |
aadb4bc4 | 3749 | |
2c59dd65 | 3750 | s = kmalloc_slab(size, flags); |
aadb4bc4 CL |
3751 | |
3752 | if (unlikely(ZERO_OR_NULL_PTR(s))) | |
6cb8f913 CL |
3753 | return s; |
3754 | ||
2b847c3c | 3755 | ret = slab_alloc_node(s, flags, node, _RET_IP_); |
5b882be4 | 3756 | |
ca2b84cb | 3757 | trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); |
5b882be4 | 3758 | |
505f5dcb | 3759 | kasan_kmalloc(s, ret, size, flags); |
0316bec2 | 3760 | |
5b882be4 | 3761 | return ret; |
81819f0f CL |
3762 | } |
3763 | EXPORT_SYMBOL(__kmalloc_node); | |
3764 | #endif | |
3765 | ||
0316bec2 | 3766 | static size_t __ksize(const void *object) |
81819f0f | 3767 | { |
272c1d21 | 3768 | struct page *page; |
81819f0f | 3769 | |
ef8b4520 | 3770 | if (unlikely(object == ZERO_SIZE_PTR)) |
272c1d21 CL |
3771 | return 0; |
3772 | ||
294a80a8 | 3773 | page = virt_to_head_page(object); |
294a80a8 | 3774 | |
76994412 PE |
3775 | if (unlikely(!PageSlab(page))) { |
3776 | WARN_ON(!PageCompound(page)); | |
294a80a8 | 3777 | return PAGE_SIZE << compound_order(page); |
76994412 | 3778 | } |
81819f0f | 3779 | |
1b4f59e3 | 3780 | return slab_ksize(page->slab_cache); |
81819f0f | 3781 | } |
0316bec2 AR |
3782 | |
3783 | size_t ksize(const void *object) | |
3784 | { | |
3785 | size_t size = __ksize(object); | |
3786 | /* We assume that ksize callers could use whole allocated area, | |
4ebb31a4 AP |
3787 | * so we need to unpoison this area. |
3788 | */ | |
3789 | kasan_unpoison_shadow(object, size); | |
0316bec2 AR |
3790 | return size; |
3791 | } | |
b1aabecd | 3792 | EXPORT_SYMBOL(ksize); |
81819f0f CL |
3793 | |
3794 | void kfree(const void *x) | |
3795 | { | |
81819f0f | 3796 | struct page *page; |
5bb983b0 | 3797 | void *object = (void *)x; |
81819f0f | 3798 | |
2121db74 PE |
3799 | trace_kfree(_RET_IP_, x); |
3800 | ||
2408c550 | 3801 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
81819f0f CL |
3802 | return; |
3803 | ||
b49af68f | 3804 | page = virt_to_head_page(x); |
aadb4bc4 | 3805 | if (unlikely(!PageSlab(page))) { |
0937502a | 3806 | BUG_ON(!PageCompound(page)); |
d56791b3 | 3807 | kfree_hook(x); |
4949148a | 3808 | __free_pages(page, compound_order(page)); |
aadb4bc4 CL |
3809 | return; |
3810 | } | |
81084651 | 3811 | slab_free(page->slab_cache, page, object, NULL, 1, _RET_IP_); |
81819f0f CL |
3812 | } |
3813 | EXPORT_SYMBOL(kfree); | |
3814 | ||
832f37f5 VD |
3815 | #define SHRINK_PROMOTE_MAX 32 |
3816 | ||
2086d26a | 3817 | /* |
832f37f5 VD |
3818 | * kmem_cache_shrink discards empty slabs and promotes the slabs filled |
3819 | * up most to the head of the partial lists. New allocations will then | |
3820 | * fill those up and thus they can be removed from the partial lists. | |
672bba3a CL |
3821 | * |
3822 | * The slabs with the least items are placed last. This results in them | |
3823 | * being allocated from last increasing the chance that the last objects | |
3824 | * are freed in them. | |
2086d26a | 3825 | */ |
d6e0b7fa | 3826 | int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate) |
2086d26a CL |
3827 | { |
3828 | int node; | |
3829 | int i; | |
3830 | struct kmem_cache_node *n; | |
3831 | struct page *page; | |
3832 | struct page *t; | |
832f37f5 VD |
3833 | struct list_head discard; |
3834 | struct list_head promote[SHRINK_PROMOTE_MAX]; | |
2086d26a | 3835 | unsigned long flags; |
ce3712d7 | 3836 | int ret = 0; |
2086d26a | 3837 | |
d6e0b7fa VD |
3838 | if (deactivate) { |
3839 | /* | |
3840 | * Disable empty slabs caching. Used to avoid pinning offline | |
3841 | * memory cgroups by kmem pages that can be freed. | |
3842 | */ | |
3843 | s->cpu_partial = 0; | |
3844 | s->min_partial = 0; | |
3845 | ||
3846 | /* | |
3847 | * s->cpu_partial is checked locklessly (see put_cpu_partial), | |
3848 | * so we have to make sure the change is visible. | |
3849 | */ | |
81ae6d03 | 3850 | synchronize_sched(); |
d6e0b7fa VD |
3851 | } |
3852 | ||
2086d26a | 3853 | flush_all(s); |
fa45dc25 | 3854 | for_each_kmem_cache_node(s, node, n) { |
832f37f5 VD |
3855 | INIT_LIST_HEAD(&discard); |
3856 | for (i = 0; i < SHRINK_PROMOTE_MAX; i++) | |
3857 | INIT_LIST_HEAD(promote + i); | |
2086d26a CL |
3858 | |
3859 | spin_lock_irqsave(&n->list_lock, flags); | |
3860 | ||
3861 | /* | |
832f37f5 | 3862 | * Build lists of slabs to discard or promote. |
2086d26a | 3863 | * |
672bba3a CL |
3864 | * Note that concurrent frees may occur while we hold the |
3865 | * list_lock. page->inuse here is the upper limit. | |
2086d26a CL |
3866 | */ |
3867 | list_for_each_entry_safe(page, t, &n->partial, lru) { | |
832f37f5 VD |
3868 | int free = page->objects - page->inuse; |
3869 | ||
3870 | /* Do not reread page->inuse */ | |
3871 | barrier(); | |
3872 | ||
3873 | /* We do not keep full slabs on the list */ | |
3874 | BUG_ON(free <= 0); | |
3875 | ||
3876 | if (free == page->objects) { | |
3877 | list_move(&page->lru, &discard); | |
69cb8e6b | 3878 | n->nr_partial--; |
832f37f5 VD |
3879 | } else if (free <= SHRINK_PROMOTE_MAX) |
3880 | list_move(&page->lru, promote + free - 1); | |
2086d26a CL |
3881 | } |
3882 | ||
2086d26a | 3883 | /* |
832f37f5 VD |
3884 | * Promote the slabs filled up most to the head of the |
3885 | * partial list. | |
2086d26a | 3886 | */ |
832f37f5 VD |
3887 | for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--) |
3888 | list_splice(promote + i, &n->partial); | |
2086d26a | 3889 | |
2086d26a | 3890 | spin_unlock_irqrestore(&n->list_lock, flags); |
69cb8e6b CL |
3891 | |
3892 | /* Release empty slabs */ | |
832f37f5 | 3893 | list_for_each_entry_safe(page, t, &discard, lru) |
69cb8e6b | 3894 | discard_slab(s, page); |
ce3712d7 VD |
3895 | |
3896 | if (slabs_node(s, node)) | |
3897 | ret = 1; | |
2086d26a CL |
3898 | } |
3899 | ||
ce3712d7 | 3900 | return ret; |
2086d26a | 3901 | } |
2086d26a | 3902 | |
b9049e23 YG |
3903 | static int slab_mem_going_offline_callback(void *arg) |
3904 | { | |
3905 | struct kmem_cache *s; | |
3906 | ||
18004c5d | 3907 | mutex_lock(&slab_mutex); |
b9049e23 | 3908 | list_for_each_entry(s, &slab_caches, list) |
d6e0b7fa | 3909 | __kmem_cache_shrink(s, false); |
18004c5d | 3910 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
3911 | |
3912 | return 0; | |
3913 | } | |
3914 | ||
3915 | static void slab_mem_offline_callback(void *arg) | |
3916 | { | |
3917 | struct kmem_cache_node *n; | |
3918 | struct kmem_cache *s; | |
3919 | struct memory_notify *marg = arg; | |
3920 | int offline_node; | |
3921 | ||
b9d5ab25 | 3922 | offline_node = marg->status_change_nid_normal; |
b9049e23 YG |
3923 | |
3924 | /* | |
3925 | * If the node still has available memory. we need kmem_cache_node | |
3926 | * for it yet. | |
3927 | */ | |
3928 | if (offline_node < 0) | |
3929 | return; | |
3930 | ||
18004c5d | 3931 | mutex_lock(&slab_mutex); |
b9049e23 YG |
3932 | list_for_each_entry(s, &slab_caches, list) { |
3933 | n = get_node(s, offline_node); | |
3934 | if (n) { | |
3935 | /* | |
3936 | * if n->nr_slabs > 0, slabs still exist on the node | |
3937 | * that is going down. We were unable to free them, | |
c9404c9c | 3938 | * and offline_pages() function shouldn't call this |
b9049e23 YG |
3939 | * callback. So, we must fail. |
3940 | */ | |
0f389ec6 | 3941 | BUG_ON(slabs_node(s, offline_node)); |
b9049e23 YG |
3942 | |
3943 | s->node[offline_node] = NULL; | |
8de66a0c | 3944 | kmem_cache_free(kmem_cache_node, n); |
b9049e23 YG |
3945 | } |
3946 | } | |
18004c5d | 3947 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
3948 | } |
3949 | ||
3950 | static int slab_mem_going_online_callback(void *arg) | |
3951 | { | |
3952 | struct kmem_cache_node *n; | |
3953 | struct kmem_cache *s; | |
3954 | struct memory_notify *marg = arg; | |
b9d5ab25 | 3955 | int nid = marg->status_change_nid_normal; |
b9049e23 YG |
3956 | int ret = 0; |
3957 | ||
3958 | /* | |
3959 | * If the node's memory is already available, then kmem_cache_node is | |
3960 | * already created. Nothing to do. | |
3961 | */ | |
3962 | if (nid < 0) | |
3963 | return 0; | |
3964 | ||
3965 | /* | |
0121c619 | 3966 | * We are bringing a node online. No memory is available yet. We must |
b9049e23 YG |
3967 | * allocate a kmem_cache_node structure in order to bring the node |
3968 | * online. | |
3969 | */ | |
18004c5d | 3970 | mutex_lock(&slab_mutex); |
b9049e23 YG |
3971 | list_for_each_entry(s, &slab_caches, list) { |
3972 | /* | |
3973 | * XXX: kmem_cache_alloc_node will fallback to other nodes | |
3974 | * since memory is not yet available from the node that | |
3975 | * is brought up. | |
3976 | */ | |
8de66a0c | 3977 | n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL); |
b9049e23 YG |
3978 | if (!n) { |
3979 | ret = -ENOMEM; | |
3980 | goto out; | |
3981 | } | |
4053497d | 3982 | init_kmem_cache_node(n); |
b9049e23 YG |
3983 | s->node[nid] = n; |
3984 | } | |
3985 | out: | |
18004c5d | 3986 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
3987 | return ret; |
3988 | } | |
3989 | ||
3990 | static int slab_memory_callback(struct notifier_block *self, | |
3991 | unsigned long action, void *arg) | |
3992 | { | |
3993 | int ret = 0; | |
3994 | ||
3995 | switch (action) { | |
3996 | case MEM_GOING_ONLINE: | |
3997 | ret = slab_mem_going_online_callback(arg); | |
3998 | break; | |
3999 | case MEM_GOING_OFFLINE: | |
4000 | ret = slab_mem_going_offline_callback(arg); | |
4001 | break; | |
4002 | case MEM_OFFLINE: | |
4003 | case MEM_CANCEL_ONLINE: | |
4004 | slab_mem_offline_callback(arg); | |
4005 | break; | |
4006 | case MEM_ONLINE: | |
4007 | case MEM_CANCEL_OFFLINE: | |
4008 | break; | |
4009 | } | |
dc19f9db KH |
4010 | if (ret) |
4011 | ret = notifier_from_errno(ret); | |
4012 | else | |
4013 | ret = NOTIFY_OK; | |
b9049e23 YG |
4014 | return ret; |
4015 | } | |
4016 | ||
3ac38faa AM |
4017 | static struct notifier_block slab_memory_callback_nb = { |
4018 | .notifier_call = slab_memory_callback, | |
4019 | .priority = SLAB_CALLBACK_PRI, | |
4020 | }; | |
b9049e23 | 4021 | |
81819f0f CL |
4022 | /******************************************************************** |
4023 | * Basic setup of slabs | |
4024 | *******************************************************************/ | |
4025 | ||
51df1142 CL |
4026 | /* |
4027 | * Used for early kmem_cache structures that were allocated using | |
dffb4d60 CL |
4028 | * the page allocator. Allocate them properly then fix up the pointers |
4029 | * that may be pointing to the wrong kmem_cache structure. | |
51df1142 CL |
4030 | */ |
4031 | ||
dffb4d60 | 4032 | static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache) |
51df1142 CL |
4033 | { |
4034 | int node; | |
dffb4d60 | 4035 | struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
fa45dc25 | 4036 | struct kmem_cache_node *n; |
51df1142 | 4037 | |
dffb4d60 | 4038 | memcpy(s, static_cache, kmem_cache->object_size); |
51df1142 | 4039 | |
7d557b3c GC |
4040 | /* |
4041 | * This runs very early, and only the boot processor is supposed to be | |
4042 | * up. Even if it weren't true, IRQs are not up so we couldn't fire | |
4043 | * IPIs around. | |
4044 | */ | |
4045 | __flush_cpu_slab(s, smp_processor_id()); | |
fa45dc25 | 4046 | for_each_kmem_cache_node(s, node, n) { |
51df1142 CL |
4047 | struct page *p; |
4048 | ||
fa45dc25 CL |
4049 | list_for_each_entry(p, &n->partial, lru) |
4050 | p->slab_cache = s; | |
51df1142 | 4051 | |
607bf324 | 4052 | #ifdef CONFIG_SLUB_DEBUG |
fa45dc25 CL |
4053 | list_for_each_entry(p, &n->full, lru) |
4054 | p->slab_cache = s; | |
51df1142 | 4055 | #endif |
51df1142 | 4056 | } |
f7ce3190 | 4057 | slab_init_memcg_params(s); |
dffb4d60 CL |
4058 | list_add(&s->list, &slab_caches); |
4059 | return s; | |
51df1142 CL |
4060 | } |
4061 | ||
81819f0f CL |
4062 | void __init kmem_cache_init(void) |
4063 | { | |
dffb4d60 CL |
4064 | static __initdata struct kmem_cache boot_kmem_cache, |
4065 | boot_kmem_cache_node; | |
51df1142 | 4066 | |
fc8d8620 SG |
4067 | if (debug_guardpage_minorder()) |
4068 | slub_max_order = 0; | |
4069 | ||
dffb4d60 CL |
4070 | kmem_cache_node = &boot_kmem_cache_node; |
4071 | kmem_cache = &boot_kmem_cache; | |
51df1142 | 4072 | |
dffb4d60 CL |
4073 | create_boot_cache(kmem_cache_node, "kmem_cache_node", |
4074 | sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN); | |
b9049e23 | 4075 | |
3ac38faa | 4076 | register_hotmemory_notifier(&slab_memory_callback_nb); |
81819f0f CL |
4077 | |
4078 | /* Able to allocate the per node structures */ | |
4079 | slab_state = PARTIAL; | |
4080 | ||
dffb4d60 CL |
4081 | create_boot_cache(kmem_cache, "kmem_cache", |
4082 | offsetof(struct kmem_cache, node) + | |
4083 | nr_node_ids * sizeof(struct kmem_cache_node *), | |
4084 | SLAB_HWCACHE_ALIGN); | |
8a13a4cc | 4085 | |
dffb4d60 | 4086 | kmem_cache = bootstrap(&boot_kmem_cache); |
81819f0f | 4087 | |
51df1142 CL |
4088 | /* |
4089 | * Allocate kmem_cache_node properly from the kmem_cache slab. | |
4090 | * kmem_cache_node is separately allocated so no need to | |
4091 | * update any list pointers. | |
4092 | */ | |
dffb4d60 | 4093 | kmem_cache_node = bootstrap(&boot_kmem_cache_node); |
51df1142 CL |
4094 | |
4095 | /* Now we can use the kmem_cache to allocate kmalloc slabs */ | |
34cc6990 | 4096 | setup_kmalloc_cache_index_table(); |
f97d5f63 | 4097 | create_kmalloc_caches(0); |
81819f0f | 4098 | |
210e7a43 TG |
4099 | /* Setup random freelists for each cache */ |
4100 | init_freelist_randomization(); | |
4101 | ||
81819f0f CL |
4102 | #ifdef CONFIG_SMP |
4103 | register_cpu_notifier(&slab_notifier); | |
9dfc6e68 | 4104 | #endif |
81819f0f | 4105 | |
f9f58285 | 4106 | pr_info("SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d, CPUs=%d, Nodes=%d\n", |
f97d5f63 | 4107 | cache_line_size(), |
81819f0f CL |
4108 | slub_min_order, slub_max_order, slub_min_objects, |
4109 | nr_cpu_ids, nr_node_ids); | |
4110 | } | |
4111 | ||
7e85ee0c PE |
4112 | void __init kmem_cache_init_late(void) |
4113 | { | |
7e85ee0c PE |
4114 | } |
4115 | ||
2633d7a0 | 4116 | struct kmem_cache * |
a44cb944 VD |
4117 | __kmem_cache_alias(const char *name, size_t size, size_t align, |
4118 | unsigned long flags, void (*ctor)(void *)) | |
81819f0f | 4119 | { |
426589f5 | 4120 | struct kmem_cache *s, *c; |
81819f0f | 4121 | |
a44cb944 | 4122 | s = find_mergeable(size, align, flags, name, ctor); |
81819f0f CL |
4123 | if (s) { |
4124 | s->refcount++; | |
84d0ddd6 | 4125 | |
81819f0f CL |
4126 | /* |
4127 | * Adjust the object sizes so that we clear | |
4128 | * the complete object on kzalloc. | |
4129 | */ | |
3b0efdfa | 4130 | s->object_size = max(s->object_size, (int)size); |
81819f0f | 4131 | s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); |
6446faa2 | 4132 | |
426589f5 | 4133 | for_each_memcg_cache(c, s) { |
84d0ddd6 VD |
4134 | c->object_size = s->object_size; |
4135 | c->inuse = max_t(int, c->inuse, | |
4136 | ALIGN(size, sizeof(void *))); | |
4137 | } | |
4138 | ||
7b8f3b66 | 4139 | if (sysfs_slab_alias(s, name)) { |
7b8f3b66 | 4140 | s->refcount--; |
cbb79694 | 4141 | s = NULL; |
7b8f3b66 | 4142 | } |
a0e1d1be | 4143 | } |
6446faa2 | 4144 | |
cbb79694 CL |
4145 | return s; |
4146 | } | |
84c1cf62 | 4147 | |
8a13a4cc | 4148 | int __kmem_cache_create(struct kmem_cache *s, unsigned long flags) |
cbb79694 | 4149 | { |
aac3a166 PE |
4150 | int err; |
4151 | ||
4152 | err = kmem_cache_open(s, flags); | |
4153 | if (err) | |
4154 | return err; | |
20cea968 | 4155 | |
45530c44 CL |
4156 | /* Mutex is not taken during early boot */ |
4157 | if (slab_state <= UP) | |
4158 | return 0; | |
4159 | ||
107dab5c | 4160 | memcg_propagate_slab_attrs(s); |
aac3a166 | 4161 | err = sysfs_slab_add(s); |
aac3a166 | 4162 | if (err) |
52b4b950 | 4163 | __kmem_cache_release(s); |
20cea968 | 4164 | |
aac3a166 | 4165 | return err; |
81819f0f | 4166 | } |
81819f0f | 4167 | |
81819f0f | 4168 | #ifdef CONFIG_SMP |
81819f0f | 4169 | /* |
672bba3a CL |
4170 | * Use the cpu notifier to insure that the cpu slabs are flushed when |
4171 | * necessary. | |
81819f0f | 4172 | */ |
0db0628d | 4173 | static int slab_cpuup_callback(struct notifier_block *nfb, |
81819f0f CL |
4174 | unsigned long action, void *hcpu) |
4175 | { | |
4176 | long cpu = (long)hcpu; | |
5b95a4ac CL |
4177 | struct kmem_cache *s; |
4178 | unsigned long flags; | |
81819f0f CL |
4179 | |
4180 | switch (action) { | |
4181 | case CPU_UP_CANCELED: | |
8bb78442 | 4182 | case CPU_UP_CANCELED_FROZEN: |
81819f0f | 4183 | case CPU_DEAD: |
8bb78442 | 4184 | case CPU_DEAD_FROZEN: |
18004c5d | 4185 | mutex_lock(&slab_mutex); |
5b95a4ac CL |
4186 | list_for_each_entry(s, &slab_caches, list) { |
4187 | local_irq_save(flags); | |
4188 | __flush_cpu_slab(s, cpu); | |
4189 | local_irq_restore(flags); | |
4190 | } | |
18004c5d | 4191 | mutex_unlock(&slab_mutex); |
81819f0f CL |
4192 | break; |
4193 | default: | |
4194 | break; | |
4195 | } | |
4196 | return NOTIFY_OK; | |
4197 | } | |
4198 | ||
0db0628d | 4199 | static struct notifier_block slab_notifier = { |
3adbefee | 4200 | .notifier_call = slab_cpuup_callback |
06428780 | 4201 | }; |
81819f0f CL |
4202 | |
4203 | #endif | |
4204 | ||
ce71e27c | 4205 | void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) |
81819f0f | 4206 | { |
aadb4bc4 | 4207 | struct kmem_cache *s; |
94b528d0 | 4208 | void *ret; |
aadb4bc4 | 4209 | |
95a05b42 | 4210 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
eada35ef PE |
4211 | return kmalloc_large(size, gfpflags); |
4212 | ||
2c59dd65 | 4213 | s = kmalloc_slab(size, gfpflags); |
81819f0f | 4214 | |
2408c550 | 4215 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
6cb8f913 | 4216 | return s; |
81819f0f | 4217 | |
2b847c3c | 4218 | ret = slab_alloc(s, gfpflags, caller); |
94b528d0 | 4219 | |
25985edc | 4220 | /* Honor the call site pointer we received. */ |
ca2b84cb | 4221 | trace_kmalloc(caller, ret, size, s->size, gfpflags); |
94b528d0 EGM |
4222 | |
4223 | return ret; | |
81819f0f CL |
4224 | } |
4225 | ||
5d1f57e4 | 4226 | #ifdef CONFIG_NUMA |
81819f0f | 4227 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, |
ce71e27c | 4228 | int node, unsigned long caller) |
81819f0f | 4229 | { |
aadb4bc4 | 4230 | struct kmem_cache *s; |
94b528d0 | 4231 | void *ret; |
aadb4bc4 | 4232 | |
95a05b42 | 4233 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
d3e14aa3 XF |
4234 | ret = kmalloc_large_node(size, gfpflags, node); |
4235 | ||
4236 | trace_kmalloc_node(caller, ret, | |
4237 | size, PAGE_SIZE << get_order(size), | |
4238 | gfpflags, node); | |
4239 | ||
4240 | return ret; | |
4241 | } | |
eada35ef | 4242 | |
2c59dd65 | 4243 | s = kmalloc_slab(size, gfpflags); |
81819f0f | 4244 | |
2408c550 | 4245 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
6cb8f913 | 4246 | return s; |
81819f0f | 4247 | |
2b847c3c | 4248 | ret = slab_alloc_node(s, gfpflags, node, caller); |
94b528d0 | 4249 | |
25985edc | 4250 | /* Honor the call site pointer we received. */ |
ca2b84cb | 4251 | trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node); |
94b528d0 EGM |
4252 | |
4253 | return ret; | |
81819f0f | 4254 | } |
5d1f57e4 | 4255 | #endif |
81819f0f | 4256 | |
ab4d5ed5 | 4257 | #ifdef CONFIG_SYSFS |
205ab99d CL |
4258 | static int count_inuse(struct page *page) |
4259 | { | |
4260 | return page->inuse; | |
4261 | } | |
4262 | ||
4263 | static int count_total(struct page *page) | |
4264 | { | |
4265 | return page->objects; | |
4266 | } | |
ab4d5ed5 | 4267 | #endif |
205ab99d | 4268 | |
ab4d5ed5 | 4269 | #ifdef CONFIG_SLUB_DEBUG |
434e245d CL |
4270 | static int validate_slab(struct kmem_cache *s, struct page *page, |
4271 | unsigned long *map) | |
53e15af0 CL |
4272 | { |
4273 | void *p; | |
a973e9dd | 4274 | void *addr = page_address(page); |
53e15af0 CL |
4275 | |
4276 | if (!check_slab(s, page) || | |
4277 | !on_freelist(s, page, NULL)) | |
4278 | return 0; | |
4279 | ||
4280 | /* Now we know that a valid freelist exists */ | |
39b26464 | 4281 | bitmap_zero(map, page->objects); |
53e15af0 | 4282 | |
5f80b13a CL |
4283 | get_map(s, page, map); |
4284 | for_each_object(p, s, addr, page->objects) { | |
4285 | if (test_bit(slab_index(p, s, addr), map)) | |
4286 | if (!check_object(s, page, p, SLUB_RED_INACTIVE)) | |
4287 | return 0; | |
53e15af0 CL |
4288 | } |
4289 | ||
224a88be | 4290 | for_each_object(p, s, addr, page->objects) |
7656c72b | 4291 | if (!test_bit(slab_index(p, s, addr), map)) |
37d57443 | 4292 | if (!check_object(s, page, p, SLUB_RED_ACTIVE)) |
53e15af0 CL |
4293 | return 0; |
4294 | return 1; | |
4295 | } | |
4296 | ||
434e245d CL |
4297 | static void validate_slab_slab(struct kmem_cache *s, struct page *page, |
4298 | unsigned long *map) | |
53e15af0 | 4299 | { |
881db7fb CL |
4300 | slab_lock(page); |
4301 | validate_slab(s, page, map); | |
4302 | slab_unlock(page); | |
53e15af0 CL |
4303 | } |
4304 | ||
434e245d CL |
4305 | static int validate_slab_node(struct kmem_cache *s, |
4306 | struct kmem_cache_node *n, unsigned long *map) | |
53e15af0 CL |
4307 | { |
4308 | unsigned long count = 0; | |
4309 | struct page *page; | |
4310 | unsigned long flags; | |
4311 | ||
4312 | spin_lock_irqsave(&n->list_lock, flags); | |
4313 | ||
4314 | list_for_each_entry(page, &n->partial, lru) { | |
434e245d | 4315 | validate_slab_slab(s, page, map); |
53e15af0 CL |
4316 | count++; |
4317 | } | |
4318 | if (count != n->nr_partial) | |
f9f58285 FF |
4319 | pr_err("SLUB %s: %ld partial slabs counted but counter=%ld\n", |
4320 | s->name, count, n->nr_partial); | |
53e15af0 CL |
4321 | |
4322 | if (!(s->flags & SLAB_STORE_USER)) | |
4323 | goto out; | |
4324 | ||
4325 | list_for_each_entry(page, &n->full, lru) { | |
434e245d | 4326 | validate_slab_slab(s, page, map); |
53e15af0 CL |
4327 | count++; |
4328 | } | |
4329 | if (count != atomic_long_read(&n->nr_slabs)) | |
f9f58285 FF |
4330 | pr_err("SLUB: %s %ld slabs counted but counter=%ld\n", |
4331 | s->name, count, atomic_long_read(&n->nr_slabs)); | |
53e15af0 CL |
4332 | |
4333 | out: | |
4334 | spin_unlock_irqrestore(&n->list_lock, flags); | |
4335 | return count; | |
4336 | } | |
4337 | ||
434e245d | 4338 | static long validate_slab_cache(struct kmem_cache *s) |
53e15af0 CL |
4339 | { |
4340 | int node; | |
4341 | unsigned long count = 0; | |
205ab99d | 4342 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
434e245d | 4343 | sizeof(unsigned long), GFP_KERNEL); |
fa45dc25 | 4344 | struct kmem_cache_node *n; |
434e245d CL |
4345 | |
4346 | if (!map) | |
4347 | return -ENOMEM; | |
53e15af0 CL |
4348 | |
4349 | flush_all(s); | |
fa45dc25 | 4350 | for_each_kmem_cache_node(s, node, n) |
434e245d | 4351 | count += validate_slab_node(s, n, map); |
434e245d | 4352 | kfree(map); |
53e15af0 CL |
4353 | return count; |
4354 | } | |
88a420e4 | 4355 | /* |
672bba3a | 4356 | * Generate lists of code addresses where slabcache objects are allocated |
88a420e4 CL |
4357 | * and freed. |
4358 | */ | |
4359 | ||
4360 | struct location { | |
4361 | unsigned long count; | |
ce71e27c | 4362 | unsigned long addr; |
45edfa58 CL |
4363 | long long sum_time; |
4364 | long min_time; | |
4365 | long max_time; | |
4366 | long min_pid; | |
4367 | long max_pid; | |
174596a0 | 4368 | DECLARE_BITMAP(cpus, NR_CPUS); |
45edfa58 | 4369 | nodemask_t nodes; |
88a420e4 CL |
4370 | }; |
4371 | ||
4372 | struct loc_track { | |
4373 | unsigned long max; | |
4374 | unsigned long count; | |
4375 | struct location *loc; | |
4376 | }; | |
4377 | ||
4378 | static void free_loc_track(struct loc_track *t) | |
4379 | { | |
4380 | if (t->max) | |
4381 | free_pages((unsigned long)t->loc, | |
4382 | get_order(sizeof(struct location) * t->max)); | |
4383 | } | |
4384 | ||
68dff6a9 | 4385 | static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags) |
88a420e4 CL |
4386 | { |
4387 | struct location *l; | |
4388 | int order; | |
4389 | ||
88a420e4 CL |
4390 | order = get_order(sizeof(struct location) * max); |
4391 | ||
68dff6a9 | 4392 | l = (void *)__get_free_pages(flags, order); |
88a420e4 CL |
4393 | if (!l) |
4394 | return 0; | |
4395 | ||
4396 | if (t->count) { | |
4397 | memcpy(l, t->loc, sizeof(struct location) * t->count); | |
4398 | free_loc_track(t); | |
4399 | } | |
4400 | t->max = max; | |
4401 | t->loc = l; | |
4402 | return 1; | |
4403 | } | |
4404 | ||
4405 | static int add_location(struct loc_track *t, struct kmem_cache *s, | |
45edfa58 | 4406 | const struct track *track) |
88a420e4 CL |
4407 | { |
4408 | long start, end, pos; | |
4409 | struct location *l; | |
ce71e27c | 4410 | unsigned long caddr; |
45edfa58 | 4411 | unsigned long age = jiffies - track->when; |
88a420e4 CL |
4412 | |
4413 | start = -1; | |
4414 | end = t->count; | |
4415 | ||
4416 | for ( ; ; ) { | |
4417 | pos = start + (end - start + 1) / 2; | |
4418 | ||
4419 | /* | |
4420 | * There is nothing at "end". If we end up there | |
4421 | * we need to add something to before end. | |
4422 | */ | |
4423 | if (pos == end) | |
4424 | break; | |
4425 | ||
4426 | caddr = t->loc[pos].addr; | |
45edfa58 CL |
4427 | if (track->addr == caddr) { |
4428 | ||
4429 | l = &t->loc[pos]; | |
4430 | l->count++; | |
4431 | if (track->when) { | |
4432 | l->sum_time += age; | |
4433 | if (age < l->min_time) | |
4434 | l->min_time = age; | |
4435 | if (age > l->max_time) | |
4436 | l->max_time = age; | |
4437 | ||
4438 | if (track->pid < l->min_pid) | |
4439 | l->min_pid = track->pid; | |
4440 | if (track->pid > l->max_pid) | |
4441 | l->max_pid = track->pid; | |
4442 | ||
174596a0 RR |
4443 | cpumask_set_cpu(track->cpu, |
4444 | to_cpumask(l->cpus)); | |
45edfa58 CL |
4445 | } |
4446 | node_set(page_to_nid(virt_to_page(track)), l->nodes); | |
88a420e4 CL |
4447 | return 1; |
4448 | } | |
4449 | ||
45edfa58 | 4450 | if (track->addr < caddr) |
88a420e4 CL |
4451 | end = pos; |
4452 | else | |
4453 | start = pos; | |
4454 | } | |
4455 | ||
4456 | /* | |
672bba3a | 4457 | * Not found. Insert new tracking element. |
88a420e4 | 4458 | */ |
68dff6a9 | 4459 | if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max, GFP_ATOMIC)) |
88a420e4 CL |
4460 | return 0; |
4461 | ||
4462 | l = t->loc + pos; | |
4463 | if (pos < t->count) | |
4464 | memmove(l + 1, l, | |
4465 | (t->count - pos) * sizeof(struct location)); | |
4466 | t->count++; | |
4467 | l->count = 1; | |
45edfa58 CL |
4468 | l->addr = track->addr; |
4469 | l->sum_time = age; | |
4470 | l->min_time = age; | |
4471 | l->max_time = age; | |
4472 | l->min_pid = track->pid; | |
4473 | l->max_pid = track->pid; | |
174596a0 RR |
4474 | cpumask_clear(to_cpumask(l->cpus)); |
4475 | cpumask_set_cpu(track->cpu, to_cpumask(l->cpus)); | |
45edfa58 CL |
4476 | nodes_clear(l->nodes); |
4477 | node_set(page_to_nid(virt_to_page(track)), l->nodes); | |
88a420e4 CL |
4478 | return 1; |
4479 | } | |
4480 | ||
4481 | static void process_slab(struct loc_track *t, struct kmem_cache *s, | |
bbd7d57b | 4482 | struct page *page, enum track_item alloc, |
a5dd5c11 | 4483 | unsigned long *map) |
88a420e4 | 4484 | { |
a973e9dd | 4485 | void *addr = page_address(page); |
88a420e4 CL |
4486 | void *p; |
4487 | ||
39b26464 | 4488 | bitmap_zero(map, page->objects); |
5f80b13a | 4489 | get_map(s, page, map); |
88a420e4 | 4490 | |
224a88be | 4491 | for_each_object(p, s, addr, page->objects) |
45edfa58 CL |
4492 | if (!test_bit(slab_index(p, s, addr), map)) |
4493 | add_location(t, s, get_track(s, p, alloc)); | |
88a420e4 CL |
4494 | } |
4495 | ||
4496 | static int list_locations(struct kmem_cache *s, char *buf, | |
4497 | enum track_item alloc) | |
4498 | { | |
e374d483 | 4499 | int len = 0; |
88a420e4 | 4500 | unsigned long i; |
68dff6a9 | 4501 | struct loc_track t = { 0, 0, NULL }; |
88a420e4 | 4502 | int node; |
bbd7d57b ED |
4503 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
4504 | sizeof(unsigned long), GFP_KERNEL); | |
fa45dc25 | 4505 | struct kmem_cache_node *n; |
88a420e4 | 4506 | |
bbd7d57b ED |
4507 | if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location), |
4508 | GFP_TEMPORARY)) { | |
4509 | kfree(map); | |
68dff6a9 | 4510 | return sprintf(buf, "Out of memory\n"); |
bbd7d57b | 4511 | } |
88a420e4 CL |
4512 | /* Push back cpu slabs */ |
4513 | flush_all(s); | |
4514 | ||
fa45dc25 | 4515 | for_each_kmem_cache_node(s, node, n) { |
88a420e4 CL |
4516 | unsigned long flags; |
4517 | struct page *page; | |
4518 | ||
9e86943b | 4519 | if (!atomic_long_read(&n->nr_slabs)) |
88a420e4 CL |
4520 | continue; |
4521 | ||
4522 | spin_lock_irqsave(&n->list_lock, flags); | |
4523 | list_for_each_entry(page, &n->partial, lru) | |
bbd7d57b | 4524 | process_slab(&t, s, page, alloc, map); |
88a420e4 | 4525 | list_for_each_entry(page, &n->full, lru) |
bbd7d57b | 4526 | process_slab(&t, s, page, alloc, map); |
88a420e4 CL |
4527 | spin_unlock_irqrestore(&n->list_lock, flags); |
4528 | } | |
4529 | ||
4530 | for (i = 0; i < t.count; i++) { | |
45edfa58 | 4531 | struct location *l = &t.loc[i]; |
88a420e4 | 4532 | |
9c246247 | 4533 | if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100) |
88a420e4 | 4534 | break; |
e374d483 | 4535 | len += sprintf(buf + len, "%7ld ", l->count); |
45edfa58 CL |
4536 | |
4537 | if (l->addr) | |
62c70bce | 4538 | len += sprintf(buf + len, "%pS", (void *)l->addr); |
88a420e4 | 4539 | else |
e374d483 | 4540 | len += sprintf(buf + len, "<not-available>"); |
45edfa58 CL |
4541 | |
4542 | if (l->sum_time != l->min_time) { | |
e374d483 | 4543 | len += sprintf(buf + len, " age=%ld/%ld/%ld", |
f8bd2258 RZ |
4544 | l->min_time, |
4545 | (long)div_u64(l->sum_time, l->count), | |
4546 | l->max_time); | |
45edfa58 | 4547 | } else |
e374d483 | 4548 | len += sprintf(buf + len, " age=%ld", |
45edfa58 CL |
4549 | l->min_time); |
4550 | ||
4551 | if (l->min_pid != l->max_pid) | |
e374d483 | 4552 | len += sprintf(buf + len, " pid=%ld-%ld", |
45edfa58 CL |
4553 | l->min_pid, l->max_pid); |
4554 | else | |
e374d483 | 4555 | len += sprintf(buf + len, " pid=%ld", |
45edfa58 CL |
4556 | l->min_pid); |
4557 | ||
174596a0 RR |
4558 | if (num_online_cpus() > 1 && |
4559 | !cpumask_empty(to_cpumask(l->cpus)) && | |
5024c1d7 TH |
4560 | len < PAGE_SIZE - 60) |
4561 | len += scnprintf(buf + len, PAGE_SIZE - len - 50, | |
4562 | " cpus=%*pbl", | |
4563 | cpumask_pr_args(to_cpumask(l->cpus))); | |
45edfa58 | 4564 | |
62bc62a8 | 4565 | if (nr_online_nodes > 1 && !nodes_empty(l->nodes) && |
5024c1d7 TH |
4566 | len < PAGE_SIZE - 60) |
4567 | len += scnprintf(buf + len, PAGE_SIZE - len - 50, | |
4568 | " nodes=%*pbl", | |
4569 | nodemask_pr_args(&l->nodes)); | |
45edfa58 | 4570 | |
e374d483 | 4571 | len += sprintf(buf + len, "\n"); |
88a420e4 CL |
4572 | } |
4573 | ||
4574 | free_loc_track(&t); | |
bbd7d57b | 4575 | kfree(map); |
88a420e4 | 4576 | if (!t.count) |
e374d483 HH |
4577 | len += sprintf(buf, "No data\n"); |
4578 | return len; | |
88a420e4 | 4579 | } |
ab4d5ed5 | 4580 | #endif |
88a420e4 | 4581 | |
a5a84755 | 4582 | #ifdef SLUB_RESILIENCY_TEST |
c07b8183 | 4583 | static void __init resiliency_test(void) |
a5a84755 CL |
4584 | { |
4585 | u8 *p; | |
4586 | ||
95a05b42 | 4587 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || KMALLOC_SHIFT_HIGH < 10); |
a5a84755 | 4588 | |
f9f58285 FF |
4589 | pr_err("SLUB resiliency testing\n"); |
4590 | pr_err("-----------------------\n"); | |
4591 | pr_err("A. Corruption after allocation\n"); | |
a5a84755 CL |
4592 | |
4593 | p = kzalloc(16, GFP_KERNEL); | |
4594 | p[16] = 0x12; | |
f9f58285 FF |
4595 | pr_err("\n1. kmalloc-16: Clobber Redzone/next pointer 0x12->0x%p\n\n", |
4596 | p + 16); | |
a5a84755 CL |
4597 | |
4598 | validate_slab_cache(kmalloc_caches[4]); | |
4599 | ||
4600 | /* Hmmm... The next two are dangerous */ | |
4601 | p = kzalloc(32, GFP_KERNEL); | |
4602 | p[32 + sizeof(void *)] = 0x34; | |
f9f58285 FF |
4603 | pr_err("\n2. kmalloc-32: Clobber next pointer/next slab 0x34 -> -0x%p\n", |
4604 | p); | |
4605 | pr_err("If allocated object is overwritten then not detectable\n\n"); | |
a5a84755 CL |
4606 | |
4607 | validate_slab_cache(kmalloc_caches[5]); | |
4608 | p = kzalloc(64, GFP_KERNEL); | |
4609 | p += 64 + (get_cycles() & 0xff) * sizeof(void *); | |
4610 | *p = 0x56; | |
f9f58285 FF |
4611 | pr_err("\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n", |
4612 | p); | |
4613 | pr_err("If allocated object is overwritten then not detectable\n\n"); | |
a5a84755 CL |
4614 | validate_slab_cache(kmalloc_caches[6]); |
4615 | ||
f9f58285 | 4616 | pr_err("\nB. Corruption after free\n"); |
a5a84755 CL |
4617 | p = kzalloc(128, GFP_KERNEL); |
4618 | kfree(p); | |
4619 | *p = 0x78; | |
f9f58285 | 4620 | pr_err("1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p); |
a5a84755 CL |
4621 | validate_slab_cache(kmalloc_caches[7]); |
4622 | ||
4623 | p = kzalloc(256, GFP_KERNEL); | |
4624 | kfree(p); | |
4625 | p[50] = 0x9a; | |
f9f58285 | 4626 | pr_err("\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", p); |
a5a84755 CL |
4627 | validate_slab_cache(kmalloc_caches[8]); |
4628 | ||
4629 | p = kzalloc(512, GFP_KERNEL); | |
4630 | kfree(p); | |
4631 | p[512] = 0xab; | |
f9f58285 | 4632 | pr_err("\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p); |
a5a84755 CL |
4633 | validate_slab_cache(kmalloc_caches[9]); |
4634 | } | |
4635 | #else | |
4636 | #ifdef CONFIG_SYSFS | |
4637 | static void resiliency_test(void) {}; | |
4638 | #endif | |
4639 | #endif | |
4640 | ||
ab4d5ed5 | 4641 | #ifdef CONFIG_SYSFS |
81819f0f | 4642 | enum slab_stat_type { |
205ab99d CL |
4643 | SL_ALL, /* All slabs */ |
4644 | SL_PARTIAL, /* Only partially allocated slabs */ | |
4645 | SL_CPU, /* Only slabs used for cpu caches */ | |
4646 | SL_OBJECTS, /* Determine allocated objects not slabs */ | |
4647 | SL_TOTAL /* Determine object capacity not slabs */ | |
81819f0f CL |
4648 | }; |
4649 | ||
205ab99d | 4650 | #define SO_ALL (1 << SL_ALL) |
81819f0f CL |
4651 | #define SO_PARTIAL (1 << SL_PARTIAL) |
4652 | #define SO_CPU (1 << SL_CPU) | |
4653 | #define SO_OBJECTS (1 << SL_OBJECTS) | |
205ab99d | 4654 | #define SO_TOTAL (1 << SL_TOTAL) |
81819f0f | 4655 | |
62e5c4b4 CG |
4656 | static ssize_t show_slab_objects(struct kmem_cache *s, |
4657 | char *buf, unsigned long flags) | |
81819f0f CL |
4658 | { |
4659 | unsigned long total = 0; | |
81819f0f CL |
4660 | int node; |
4661 | int x; | |
4662 | unsigned long *nodes; | |
81819f0f | 4663 | |
e35e1a97 | 4664 | nodes = kzalloc(sizeof(unsigned long) * nr_node_ids, GFP_KERNEL); |
62e5c4b4 CG |
4665 | if (!nodes) |
4666 | return -ENOMEM; | |
81819f0f | 4667 | |
205ab99d CL |
4668 | if (flags & SO_CPU) { |
4669 | int cpu; | |
81819f0f | 4670 | |
205ab99d | 4671 | for_each_possible_cpu(cpu) { |
d0e0ac97 CG |
4672 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, |
4673 | cpu); | |
ec3ab083 | 4674 | int node; |
49e22585 | 4675 | struct page *page; |
dfb4f096 | 4676 | |
4db0c3c2 | 4677 | page = READ_ONCE(c->page); |
ec3ab083 CL |
4678 | if (!page) |
4679 | continue; | |
205ab99d | 4680 | |
ec3ab083 CL |
4681 | node = page_to_nid(page); |
4682 | if (flags & SO_TOTAL) | |
4683 | x = page->objects; | |
4684 | else if (flags & SO_OBJECTS) | |
4685 | x = page->inuse; | |
4686 | else | |
4687 | x = 1; | |
49e22585 | 4688 | |
ec3ab083 CL |
4689 | total += x; |
4690 | nodes[node] += x; | |
4691 | ||
4db0c3c2 | 4692 | page = READ_ONCE(c->partial); |
49e22585 | 4693 | if (page) { |
8afb1474 LZ |
4694 | node = page_to_nid(page); |
4695 | if (flags & SO_TOTAL) | |
4696 | WARN_ON_ONCE(1); | |
4697 | else if (flags & SO_OBJECTS) | |
4698 | WARN_ON_ONCE(1); | |
4699 | else | |
4700 | x = page->pages; | |
bc6697d8 ED |
4701 | total += x; |
4702 | nodes[node] += x; | |
49e22585 | 4703 | } |
81819f0f CL |
4704 | } |
4705 | } | |
4706 | ||
bfc8c901 | 4707 | get_online_mems(); |
ab4d5ed5 | 4708 | #ifdef CONFIG_SLUB_DEBUG |
205ab99d | 4709 | if (flags & SO_ALL) { |
fa45dc25 CL |
4710 | struct kmem_cache_node *n; |
4711 | ||
4712 | for_each_kmem_cache_node(s, node, n) { | |
205ab99d | 4713 | |
d0e0ac97 CG |
4714 | if (flags & SO_TOTAL) |
4715 | x = atomic_long_read(&n->total_objects); | |
4716 | else if (flags & SO_OBJECTS) | |
4717 | x = atomic_long_read(&n->total_objects) - | |
4718 | count_partial(n, count_free); | |
81819f0f | 4719 | else |
205ab99d | 4720 | x = atomic_long_read(&n->nr_slabs); |
81819f0f CL |
4721 | total += x; |
4722 | nodes[node] += x; | |
4723 | } | |
4724 | ||
ab4d5ed5 CL |
4725 | } else |
4726 | #endif | |
4727 | if (flags & SO_PARTIAL) { | |
fa45dc25 | 4728 | struct kmem_cache_node *n; |
81819f0f | 4729 | |
fa45dc25 | 4730 | for_each_kmem_cache_node(s, node, n) { |
205ab99d CL |
4731 | if (flags & SO_TOTAL) |
4732 | x = count_partial(n, count_total); | |
4733 | else if (flags & SO_OBJECTS) | |
4734 | x = count_partial(n, count_inuse); | |
81819f0f | 4735 | else |
205ab99d | 4736 | x = n->nr_partial; |
81819f0f CL |
4737 | total += x; |
4738 | nodes[node] += x; | |
4739 | } | |
4740 | } | |
81819f0f CL |
4741 | x = sprintf(buf, "%lu", total); |
4742 | #ifdef CONFIG_NUMA | |
fa45dc25 | 4743 | for (node = 0; node < nr_node_ids; node++) |
81819f0f CL |
4744 | if (nodes[node]) |
4745 | x += sprintf(buf + x, " N%d=%lu", | |
4746 | node, nodes[node]); | |
4747 | #endif | |
bfc8c901 | 4748 | put_online_mems(); |
81819f0f CL |
4749 | kfree(nodes); |
4750 | return x + sprintf(buf + x, "\n"); | |
4751 | } | |
4752 | ||
ab4d5ed5 | 4753 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f CL |
4754 | static int any_slab_objects(struct kmem_cache *s) |
4755 | { | |
4756 | int node; | |
fa45dc25 | 4757 | struct kmem_cache_node *n; |
81819f0f | 4758 | |
fa45dc25 | 4759 | for_each_kmem_cache_node(s, node, n) |
4ea33e2d | 4760 | if (atomic_long_read(&n->total_objects)) |
81819f0f | 4761 | return 1; |
fa45dc25 | 4762 | |
81819f0f CL |
4763 | return 0; |
4764 | } | |
ab4d5ed5 | 4765 | #endif |
81819f0f CL |
4766 | |
4767 | #define to_slab_attr(n) container_of(n, struct slab_attribute, attr) | |
497888cf | 4768 | #define to_slab(n) container_of(n, struct kmem_cache, kobj) |
81819f0f CL |
4769 | |
4770 | struct slab_attribute { | |
4771 | struct attribute attr; | |
4772 | ssize_t (*show)(struct kmem_cache *s, char *buf); | |
4773 | ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count); | |
4774 | }; | |
4775 | ||
4776 | #define SLAB_ATTR_RO(_name) \ | |
ab067e99 VK |
4777 | static struct slab_attribute _name##_attr = \ |
4778 | __ATTR(_name, 0400, _name##_show, NULL) | |
81819f0f CL |
4779 | |
4780 | #define SLAB_ATTR(_name) \ | |
4781 | static struct slab_attribute _name##_attr = \ | |
ab067e99 | 4782 | __ATTR(_name, 0600, _name##_show, _name##_store) |
81819f0f | 4783 | |
81819f0f CL |
4784 | static ssize_t slab_size_show(struct kmem_cache *s, char *buf) |
4785 | { | |
4786 | return sprintf(buf, "%d\n", s->size); | |
4787 | } | |
4788 | SLAB_ATTR_RO(slab_size); | |
4789 | ||
4790 | static ssize_t align_show(struct kmem_cache *s, char *buf) | |
4791 | { | |
4792 | return sprintf(buf, "%d\n", s->align); | |
4793 | } | |
4794 | SLAB_ATTR_RO(align); | |
4795 | ||
4796 | static ssize_t object_size_show(struct kmem_cache *s, char *buf) | |
4797 | { | |
3b0efdfa | 4798 | return sprintf(buf, "%d\n", s->object_size); |
81819f0f CL |
4799 | } |
4800 | SLAB_ATTR_RO(object_size); | |
4801 | ||
4802 | static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf) | |
4803 | { | |
834f3d11 | 4804 | return sprintf(buf, "%d\n", oo_objects(s->oo)); |
81819f0f CL |
4805 | } |
4806 | SLAB_ATTR_RO(objs_per_slab); | |
4807 | ||
06b285dc CL |
4808 | static ssize_t order_store(struct kmem_cache *s, |
4809 | const char *buf, size_t length) | |
4810 | { | |
0121c619 CL |
4811 | unsigned long order; |
4812 | int err; | |
4813 | ||
3dbb95f7 | 4814 | err = kstrtoul(buf, 10, &order); |
0121c619 CL |
4815 | if (err) |
4816 | return err; | |
06b285dc CL |
4817 | |
4818 | if (order > slub_max_order || order < slub_min_order) | |
4819 | return -EINVAL; | |
4820 | ||
4821 | calculate_sizes(s, order); | |
4822 | return length; | |
4823 | } | |
4824 | ||
81819f0f CL |
4825 | static ssize_t order_show(struct kmem_cache *s, char *buf) |
4826 | { | |
834f3d11 | 4827 | return sprintf(buf, "%d\n", oo_order(s->oo)); |
81819f0f | 4828 | } |
06b285dc | 4829 | SLAB_ATTR(order); |
81819f0f | 4830 | |
73d342b1 DR |
4831 | static ssize_t min_partial_show(struct kmem_cache *s, char *buf) |
4832 | { | |
4833 | return sprintf(buf, "%lu\n", s->min_partial); | |
4834 | } | |
4835 | ||
4836 | static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, | |
4837 | size_t length) | |
4838 | { | |
4839 | unsigned long min; | |
4840 | int err; | |
4841 | ||
3dbb95f7 | 4842 | err = kstrtoul(buf, 10, &min); |
73d342b1 DR |
4843 | if (err) |
4844 | return err; | |
4845 | ||
c0bdb232 | 4846 | set_min_partial(s, min); |
73d342b1 DR |
4847 | return length; |
4848 | } | |
4849 | SLAB_ATTR(min_partial); | |
4850 | ||
49e22585 CL |
4851 | static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf) |
4852 | { | |
4853 | return sprintf(buf, "%u\n", s->cpu_partial); | |
4854 | } | |
4855 | ||
4856 | static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf, | |
4857 | size_t length) | |
4858 | { | |
4859 | unsigned long objects; | |
4860 | int err; | |
4861 | ||
3dbb95f7 | 4862 | err = kstrtoul(buf, 10, &objects); |
49e22585 CL |
4863 | if (err) |
4864 | return err; | |
345c905d | 4865 | if (objects && !kmem_cache_has_cpu_partial(s)) |
74ee4ef1 | 4866 | return -EINVAL; |
49e22585 CL |
4867 | |
4868 | s->cpu_partial = objects; | |
4869 | flush_all(s); | |
4870 | return length; | |
4871 | } | |
4872 | SLAB_ATTR(cpu_partial); | |
4873 | ||
81819f0f CL |
4874 | static ssize_t ctor_show(struct kmem_cache *s, char *buf) |
4875 | { | |
62c70bce JP |
4876 | if (!s->ctor) |
4877 | return 0; | |
4878 | return sprintf(buf, "%pS\n", s->ctor); | |
81819f0f CL |
4879 | } |
4880 | SLAB_ATTR_RO(ctor); | |
4881 | ||
81819f0f CL |
4882 | static ssize_t aliases_show(struct kmem_cache *s, char *buf) |
4883 | { | |
4307c14f | 4884 | return sprintf(buf, "%d\n", s->refcount < 0 ? 0 : s->refcount - 1); |
81819f0f CL |
4885 | } |
4886 | SLAB_ATTR_RO(aliases); | |
4887 | ||
81819f0f CL |
4888 | static ssize_t partial_show(struct kmem_cache *s, char *buf) |
4889 | { | |
d9acf4b7 | 4890 | return show_slab_objects(s, buf, SO_PARTIAL); |
81819f0f CL |
4891 | } |
4892 | SLAB_ATTR_RO(partial); | |
4893 | ||
4894 | static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf) | |
4895 | { | |
d9acf4b7 | 4896 | return show_slab_objects(s, buf, SO_CPU); |
81819f0f CL |
4897 | } |
4898 | SLAB_ATTR_RO(cpu_slabs); | |
4899 | ||
4900 | static ssize_t objects_show(struct kmem_cache *s, char *buf) | |
4901 | { | |
205ab99d | 4902 | return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS); |
81819f0f CL |
4903 | } |
4904 | SLAB_ATTR_RO(objects); | |
4905 | ||
205ab99d CL |
4906 | static ssize_t objects_partial_show(struct kmem_cache *s, char *buf) |
4907 | { | |
4908 | return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS); | |
4909 | } | |
4910 | SLAB_ATTR_RO(objects_partial); | |
4911 | ||
49e22585 CL |
4912 | static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) |
4913 | { | |
4914 | int objects = 0; | |
4915 | int pages = 0; | |
4916 | int cpu; | |
4917 | int len; | |
4918 | ||
4919 | for_each_online_cpu(cpu) { | |
4920 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu)->partial; | |
4921 | ||
4922 | if (page) { | |
4923 | pages += page->pages; | |
4924 | objects += page->pobjects; | |
4925 | } | |
4926 | } | |
4927 | ||
4928 | len = sprintf(buf, "%d(%d)", objects, pages); | |
4929 | ||
4930 | #ifdef CONFIG_SMP | |
4931 | for_each_online_cpu(cpu) { | |
4932 | struct page *page = per_cpu_ptr(s->cpu_slab, cpu) ->partial; | |
4933 | ||
4934 | if (page && len < PAGE_SIZE - 20) | |
4935 | len += sprintf(buf + len, " C%d=%d(%d)", cpu, | |
4936 | page->pobjects, page->pages); | |
4937 | } | |
4938 | #endif | |
4939 | return len + sprintf(buf + len, "\n"); | |
4940 | } | |
4941 | SLAB_ATTR_RO(slabs_cpu_partial); | |
4942 | ||
a5a84755 CL |
4943 | static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf) |
4944 | { | |
4945 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT)); | |
4946 | } | |
4947 | ||
4948 | static ssize_t reclaim_account_store(struct kmem_cache *s, | |
4949 | const char *buf, size_t length) | |
4950 | { | |
4951 | s->flags &= ~SLAB_RECLAIM_ACCOUNT; | |
4952 | if (buf[0] == '1') | |
4953 | s->flags |= SLAB_RECLAIM_ACCOUNT; | |
4954 | return length; | |
4955 | } | |
4956 | SLAB_ATTR(reclaim_account); | |
4957 | ||
4958 | static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf) | |
4959 | { | |
4960 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN)); | |
4961 | } | |
4962 | SLAB_ATTR_RO(hwcache_align); | |
4963 | ||
4964 | #ifdef CONFIG_ZONE_DMA | |
4965 | static ssize_t cache_dma_show(struct kmem_cache *s, char *buf) | |
4966 | { | |
4967 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA)); | |
4968 | } | |
4969 | SLAB_ATTR_RO(cache_dma); | |
4970 | #endif | |
4971 | ||
4972 | static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf) | |
4973 | { | |
4974 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU)); | |
4975 | } | |
4976 | SLAB_ATTR_RO(destroy_by_rcu); | |
4977 | ||
ab9a0f19 LJ |
4978 | static ssize_t reserved_show(struct kmem_cache *s, char *buf) |
4979 | { | |
4980 | return sprintf(buf, "%d\n", s->reserved); | |
4981 | } | |
4982 | SLAB_ATTR_RO(reserved); | |
4983 | ||
ab4d5ed5 | 4984 | #ifdef CONFIG_SLUB_DEBUG |
a5a84755 CL |
4985 | static ssize_t slabs_show(struct kmem_cache *s, char *buf) |
4986 | { | |
4987 | return show_slab_objects(s, buf, SO_ALL); | |
4988 | } | |
4989 | SLAB_ATTR_RO(slabs); | |
4990 | ||
205ab99d CL |
4991 | static ssize_t total_objects_show(struct kmem_cache *s, char *buf) |
4992 | { | |
4993 | return show_slab_objects(s, buf, SO_ALL|SO_TOTAL); | |
4994 | } | |
4995 | SLAB_ATTR_RO(total_objects); | |
4996 | ||
81819f0f CL |
4997 | static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf) |
4998 | { | |
becfda68 | 4999 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CONSISTENCY_CHECKS)); |
81819f0f CL |
5000 | } |
5001 | ||
5002 | static ssize_t sanity_checks_store(struct kmem_cache *s, | |
5003 | const char *buf, size_t length) | |
5004 | { | |
becfda68 | 5005 | s->flags &= ~SLAB_CONSISTENCY_CHECKS; |
b789ef51 CL |
5006 | if (buf[0] == '1') { |
5007 | s->flags &= ~__CMPXCHG_DOUBLE; | |
becfda68 | 5008 | s->flags |= SLAB_CONSISTENCY_CHECKS; |
b789ef51 | 5009 | } |
81819f0f CL |
5010 | return length; |
5011 | } | |
5012 | SLAB_ATTR(sanity_checks); | |
5013 | ||
5014 | static ssize_t trace_show(struct kmem_cache *s, char *buf) | |
5015 | { | |
5016 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE)); | |
5017 | } | |
5018 | ||
5019 | static ssize_t trace_store(struct kmem_cache *s, const char *buf, | |
5020 | size_t length) | |
5021 | { | |
c9e16131 CL |
5022 | /* |
5023 | * Tracing a merged cache is going to give confusing results | |
5024 | * as well as cause other issues like converting a mergeable | |
5025 | * cache into an umergeable one. | |
5026 | */ | |
5027 | if (s->refcount > 1) | |
5028 | return -EINVAL; | |
5029 | ||
81819f0f | 5030 | s->flags &= ~SLAB_TRACE; |
b789ef51 CL |
5031 | if (buf[0] == '1') { |
5032 | s->flags &= ~__CMPXCHG_DOUBLE; | |
81819f0f | 5033 | s->flags |= SLAB_TRACE; |
b789ef51 | 5034 | } |
81819f0f CL |
5035 | return length; |
5036 | } | |
5037 | SLAB_ATTR(trace); | |
5038 | ||
81819f0f CL |
5039 | static ssize_t red_zone_show(struct kmem_cache *s, char *buf) |
5040 | { | |
5041 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE)); | |
5042 | } | |
5043 | ||
5044 | static ssize_t red_zone_store(struct kmem_cache *s, | |
5045 | const char *buf, size_t length) | |
5046 | { | |
5047 | if (any_slab_objects(s)) | |
5048 | return -EBUSY; | |
5049 | ||
5050 | s->flags &= ~SLAB_RED_ZONE; | |
b789ef51 | 5051 | if (buf[0] == '1') { |
81819f0f | 5052 | s->flags |= SLAB_RED_ZONE; |
b789ef51 | 5053 | } |
06b285dc | 5054 | calculate_sizes(s, -1); |
81819f0f CL |
5055 | return length; |
5056 | } | |
5057 | SLAB_ATTR(red_zone); | |
5058 | ||
5059 | static ssize_t poison_show(struct kmem_cache *s, char *buf) | |
5060 | { | |
5061 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON)); | |
5062 | } | |
5063 | ||
5064 | static ssize_t poison_store(struct kmem_cache *s, | |
5065 | const char *buf, size_t length) | |
5066 | { | |
5067 | if (any_slab_objects(s)) | |
5068 | return -EBUSY; | |
5069 | ||
5070 | s->flags &= ~SLAB_POISON; | |
b789ef51 | 5071 | if (buf[0] == '1') { |
81819f0f | 5072 | s->flags |= SLAB_POISON; |
b789ef51 | 5073 | } |
06b285dc | 5074 | calculate_sizes(s, -1); |
81819f0f CL |
5075 | return length; |
5076 | } | |
5077 | SLAB_ATTR(poison); | |
5078 | ||
5079 | static ssize_t store_user_show(struct kmem_cache *s, char *buf) | |
5080 | { | |
5081 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER)); | |
5082 | } | |
5083 | ||
5084 | static ssize_t store_user_store(struct kmem_cache *s, | |
5085 | const char *buf, size_t length) | |
5086 | { | |
5087 | if (any_slab_objects(s)) | |
5088 | return -EBUSY; | |
5089 | ||
5090 | s->flags &= ~SLAB_STORE_USER; | |
b789ef51 CL |
5091 | if (buf[0] == '1') { |
5092 | s->flags &= ~__CMPXCHG_DOUBLE; | |
81819f0f | 5093 | s->flags |= SLAB_STORE_USER; |
b789ef51 | 5094 | } |
06b285dc | 5095 | calculate_sizes(s, -1); |
81819f0f CL |
5096 | return length; |
5097 | } | |
5098 | SLAB_ATTR(store_user); | |
5099 | ||
53e15af0 CL |
5100 | static ssize_t validate_show(struct kmem_cache *s, char *buf) |
5101 | { | |
5102 | return 0; | |
5103 | } | |
5104 | ||
5105 | static ssize_t validate_store(struct kmem_cache *s, | |
5106 | const char *buf, size_t length) | |
5107 | { | |
434e245d CL |
5108 | int ret = -EINVAL; |
5109 | ||
5110 | if (buf[0] == '1') { | |
5111 | ret = validate_slab_cache(s); | |
5112 | if (ret >= 0) | |
5113 | ret = length; | |
5114 | } | |
5115 | return ret; | |
53e15af0 CL |
5116 | } |
5117 | SLAB_ATTR(validate); | |
a5a84755 CL |
5118 | |
5119 | static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf) | |
5120 | { | |
5121 | if (!(s->flags & SLAB_STORE_USER)) | |
5122 | return -ENOSYS; | |
5123 | return list_locations(s, buf, TRACK_ALLOC); | |
5124 | } | |
5125 | SLAB_ATTR_RO(alloc_calls); | |
5126 | ||
5127 | static ssize_t free_calls_show(struct kmem_cache *s, char *buf) | |
5128 | { | |
5129 | if (!(s->flags & SLAB_STORE_USER)) | |
5130 | return -ENOSYS; | |
5131 | return list_locations(s, buf, TRACK_FREE); | |
5132 | } | |
5133 | SLAB_ATTR_RO(free_calls); | |
5134 | #endif /* CONFIG_SLUB_DEBUG */ | |
5135 | ||
5136 | #ifdef CONFIG_FAILSLAB | |
5137 | static ssize_t failslab_show(struct kmem_cache *s, char *buf) | |
5138 | { | |
5139 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB)); | |
5140 | } | |
5141 | ||
5142 | static ssize_t failslab_store(struct kmem_cache *s, const char *buf, | |
5143 | size_t length) | |
5144 | { | |
c9e16131 CL |
5145 | if (s->refcount > 1) |
5146 | return -EINVAL; | |
5147 | ||
a5a84755 CL |
5148 | s->flags &= ~SLAB_FAILSLAB; |
5149 | if (buf[0] == '1') | |
5150 | s->flags |= SLAB_FAILSLAB; | |
5151 | return length; | |
5152 | } | |
5153 | SLAB_ATTR(failslab); | |
ab4d5ed5 | 5154 | #endif |
53e15af0 | 5155 | |
2086d26a CL |
5156 | static ssize_t shrink_show(struct kmem_cache *s, char *buf) |
5157 | { | |
5158 | return 0; | |
5159 | } | |
5160 | ||
5161 | static ssize_t shrink_store(struct kmem_cache *s, | |
5162 | const char *buf, size_t length) | |
5163 | { | |
832f37f5 VD |
5164 | if (buf[0] == '1') |
5165 | kmem_cache_shrink(s); | |
5166 | else | |
2086d26a CL |
5167 | return -EINVAL; |
5168 | return length; | |
5169 | } | |
5170 | SLAB_ATTR(shrink); | |
5171 | ||
81819f0f | 5172 | #ifdef CONFIG_NUMA |
9824601e | 5173 | static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf) |
81819f0f | 5174 | { |
9824601e | 5175 | return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10); |
81819f0f CL |
5176 | } |
5177 | ||
9824601e | 5178 | static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, |
81819f0f CL |
5179 | const char *buf, size_t length) |
5180 | { | |
0121c619 CL |
5181 | unsigned long ratio; |
5182 | int err; | |
5183 | ||
3dbb95f7 | 5184 | err = kstrtoul(buf, 10, &ratio); |
0121c619 CL |
5185 | if (err) |
5186 | return err; | |
5187 | ||
e2cb96b7 | 5188 | if (ratio <= 100) |
0121c619 | 5189 | s->remote_node_defrag_ratio = ratio * 10; |
81819f0f | 5190 | |
81819f0f CL |
5191 | return length; |
5192 | } | |
9824601e | 5193 | SLAB_ATTR(remote_node_defrag_ratio); |
81819f0f CL |
5194 | #endif |
5195 | ||
8ff12cfc | 5196 | #ifdef CONFIG_SLUB_STATS |
8ff12cfc CL |
5197 | static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) |
5198 | { | |
5199 | unsigned long sum = 0; | |
5200 | int cpu; | |
5201 | int len; | |
5202 | int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL); | |
5203 | ||
5204 | if (!data) | |
5205 | return -ENOMEM; | |
5206 | ||
5207 | for_each_online_cpu(cpu) { | |
9dfc6e68 | 5208 | unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; |
8ff12cfc CL |
5209 | |
5210 | data[cpu] = x; | |
5211 | sum += x; | |
5212 | } | |
5213 | ||
5214 | len = sprintf(buf, "%lu", sum); | |
5215 | ||
50ef37b9 | 5216 | #ifdef CONFIG_SMP |
8ff12cfc CL |
5217 | for_each_online_cpu(cpu) { |
5218 | if (data[cpu] && len < PAGE_SIZE - 20) | |
50ef37b9 | 5219 | len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); |
8ff12cfc | 5220 | } |
50ef37b9 | 5221 | #endif |
8ff12cfc CL |
5222 | kfree(data); |
5223 | return len + sprintf(buf + len, "\n"); | |
5224 | } | |
5225 | ||
78eb00cc DR |
5226 | static void clear_stat(struct kmem_cache *s, enum stat_item si) |
5227 | { | |
5228 | int cpu; | |
5229 | ||
5230 | for_each_online_cpu(cpu) | |
9dfc6e68 | 5231 | per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; |
78eb00cc DR |
5232 | } |
5233 | ||
8ff12cfc CL |
5234 | #define STAT_ATTR(si, text) \ |
5235 | static ssize_t text##_show(struct kmem_cache *s, char *buf) \ | |
5236 | { \ | |
5237 | return show_stat(s, buf, si); \ | |
5238 | } \ | |
78eb00cc DR |
5239 | static ssize_t text##_store(struct kmem_cache *s, \ |
5240 | const char *buf, size_t length) \ | |
5241 | { \ | |
5242 | if (buf[0] != '0') \ | |
5243 | return -EINVAL; \ | |
5244 | clear_stat(s, si); \ | |
5245 | return length; \ | |
5246 | } \ | |
5247 | SLAB_ATTR(text); \ | |
8ff12cfc CL |
5248 | |
5249 | STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); | |
5250 | STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); | |
5251 | STAT_ATTR(FREE_FASTPATH, free_fastpath); | |
5252 | STAT_ATTR(FREE_SLOWPATH, free_slowpath); | |
5253 | STAT_ATTR(FREE_FROZEN, free_frozen); | |
5254 | STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); | |
5255 | STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); | |
5256 | STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); | |
5257 | STAT_ATTR(ALLOC_SLAB, alloc_slab); | |
5258 | STAT_ATTR(ALLOC_REFILL, alloc_refill); | |
e36a2652 | 5259 | STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch); |
8ff12cfc CL |
5260 | STAT_ATTR(FREE_SLAB, free_slab); |
5261 | STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); | |
5262 | STAT_ATTR(DEACTIVATE_FULL, deactivate_full); | |
5263 | STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); | |
5264 | STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); | |
5265 | STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); | |
5266 | STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); | |
03e404af | 5267 | STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass); |
65c3376a | 5268 | STAT_ATTR(ORDER_FALLBACK, order_fallback); |
b789ef51 CL |
5269 | STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail); |
5270 | STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail); | |
49e22585 CL |
5271 | STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc); |
5272 | STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free); | |
8028dcea AS |
5273 | STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node); |
5274 | STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain); | |
8ff12cfc CL |
5275 | #endif |
5276 | ||
06428780 | 5277 | static struct attribute *slab_attrs[] = { |
81819f0f CL |
5278 | &slab_size_attr.attr, |
5279 | &object_size_attr.attr, | |
5280 | &objs_per_slab_attr.attr, | |
5281 | &order_attr.attr, | |
73d342b1 | 5282 | &min_partial_attr.attr, |
49e22585 | 5283 | &cpu_partial_attr.attr, |
81819f0f | 5284 | &objects_attr.attr, |
205ab99d | 5285 | &objects_partial_attr.attr, |
81819f0f CL |
5286 | &partial_attr.attr, |
5287 | &cpu_slabs_attr.attr, | |
5288 | &ctor_attr.attr, | |
81819f0f CL |
5289 | &aliases_attr.attr, |
5290 | &align_attr.attr, | |
81819f0f CL |
5291 | &hwcache_align_attr.attr, |
5292 | &reclaim_account_attr.attr, | |
5293 | &destroy_by_rcu_attr.attr, | |
a5a84755 | 5294 | &shrink_attr.attr, |
ab9a0f19 | 5295 | &reserved_attr.attr, |
49e22585 | 5296 | &slabs_cpu_partial_attr.attr, |
ab4d5ed5 | 5297 | #ifdef CONFIG_SLUB_DEBUG |
a5a84755 CL |
5298 | &total_objects_attr.attr, |
5299 | &slabs_attr.attr, | |
5300 | &sanity_checks_attr.attr, | |
5301 | &trace_attr.attr, | |
81819f0f CL |
5302 | &red_zone_attr.attr, |
5303 | &poison_attr.attr, | |
5304 | &store_user_attr.attr, | |
53e15af0 | 5305 | &validate_attr.attr, |
88a420e4 CL |
5306 | &alloc_calls_attr.attr, |
5307 | &free_calls_attr.attr, | |
ab4d5ed5 | 5308 | #endif |
81819f0f CL |
5309 | #ifdef CONFIG_ZONE_DMA |
5310 | &cache_dma_attr.attr, | |
5311 | #endif | |
5312 | #ifdef CONFIG_NUMA | |
9824601e | 5313 | &remote_node_defrag_ratio_attr.attr, |
8ff12cfc CL |
5314 | #endif |
5315 | #ifdef CONFIG_SLUB_STATS | |
5316 | &alloc_fastpath_attr.attr, | |
5317 | &alloc_slowpath_attr.attr, | |
5318 | &free_fastpath_attr.attr, | |
5319 | &free_slowpath_attr.attr, | |
5320 | &free_frozen_attr.attr, | |
5321 | &free_add_partial_attr.attr, | |
5322 | &free_remove_partial_attr.attr, | |
5323 | &alloc_from_partial_attr.attr, | |
5324 | &alloc_slab_attr.attr, | |
5325 | &alloc_refill_attr.attr, | |
e36a2652 | 5326 | &alloc_node_mismatch_attr.attr, |
8ff12cfc CL |
5327 | &free_slab_attr.attr, |
5328 | &cpuslab_flush_attr.attr, | |
5329 | &deactivate_full_attr.attr, | |
5330 | &deactivate_empty_attr.attr, | |
5331 | &deactivate_to_head_attr.attr, | |
5332 | &deactivate_to_tail_attr.attr, | |
5333 | &deactivate_remote_frees_attr.attr, | |
03e404af | 5334 | &deactivate_bypass_attr.attr, |
65c3376a | 5335 | &order_fallback_attr.attr, |
b789ef51 CL |
5336 | &cmpxchg_double_fail_attr.attr, |
5337 | &cmpxchg_double_cpu_fail_attr.attr, | |
49e22585 CL |
5338 | &cpu_partial_alloc_attr.attr, |
5339 | &cpu_partial_free_attr.attr, | |
8028dcea AS |
5340 | &cpu_partial_node_attr.attr, |
5341 | &cpu_partial_drain_attr.attr, | |
81819f0f | 5342 | #endif |
4c13dd3b DM |
5343 | #ifdef CONFIG_FAILSLAB |
5344 | &failslab_attr.attr, | |
5345 | #endif | |
5346 | ||
81819f0f CL |
5347 | NULL |
5348 | }; | |
5349 | ||
5350 | static struct attribute_group slab_attr_group = { | |
5351 | .attrs = slab_attrs, | |
5352 | }; | |
5353 | ||
5354 | static ssize_t slab_attr_show(struct kobject *kobj, | |
5355 | struct attribute *attr, | |
5356 | char *buf) | |
5357 | { | |
5358 | struct slab_attribute *attribute; | |
5359 | struct kmem_cache *s; | |
5360 | int err; | |
5361 | ||
5362 | attribute = to_slab_attr(attr); | |
5363 | s = to_slab(kobj); | |
5364 | ||
5365 | if (!attribute->show) | |
5366 | return -EIO; | |
5367 | ||
5368 | err = attribute->show(s, buf); | |
5369 | ||
5370 | return err; | |
5371 | } | |
5372 | ||
5373 | static ssize_t slab_attr_store(struct kobject *kobj, | |
5374 | struct attribute *attr, | |
5375 | const char *buf, size_t len) | |
5376 | { | |
5377 | struct slab_attribute *attribute; | |
5378 | struct kmem_cache *s; | |
5379 | int err; | |
5380 | ||
5381 | attribute = to_slab_attr(attr); | |
5382 | s = to_slab(kobj); | |
5383 | ||
5384 | if (!attribute->store) | |
5385 | return -EIO; | |
5386 | ||
5387 | err = attribute->store(s, buf, len); | |
127424c8 | 5388 | #ifdef CONFIG_MEMCG |
107dab5c | 5389 | if (slab_state >= FULL && err >= 0 && is_root_cache(s)) { |
426589f5 | 5390 | struct kmem_cache *c; |
81819f0f | 5391 | |
107dab5c GC |
5392 | mutex_lock(&slab_mutex); |
5393 | if (s->max_attr_size < len) | |
5394 | s->max_attr_size = len; | |
5395 | ||
ebe945c2 GC |
5396 | /* |
5397 | * This is a best effort propagation, so this function's return | |
5398 | * value will be determined by the parent cache only. This is | |
5399 | * basically because not all attributes will have a well | |
5400 | * defined semantics for rollbacks - most of the actions will | |
5401 | * have permanent effects. | |
5402 | * | |
5403 | * Returning the error value of any of the children that fail | |
5404 | * is not 100 % defined, in the sense that users seeing the | |
5405 | * error code won't be able to know anything about the state of | |
5406 | * the cache. | |
5407 | * | |
5408 | * Only returning the error code for the parent cache at least | |
5409 | * has well defined semantics. The cache being written to | |
5410 | * directly either failed or succeeded, in which case we loop | |
5411 | * through the descendants with best-effort propagation. | |
5412 | */ | |
426589f5 VD |
5413 | for_each_memcg_cache(c, s) |
5414 | attribute->store(c, buf, len); | |
107dab5c GC |
5415 | mutex_unlock(&slab_mutex); |
5416 | } | |
5417 | #endif | |
81819f0f CL |
5418 | return err; |
5419 | } | |
5420 | ||
107dab5c GC |
5421 | static void memcg_propagate_slab_attrs(struct kmem_cache *s) |
5422 | { | |
127424c8 | 5423 | #ifdef CONFIG_MEMCG |
107dab5c GC |
5424 | int i; |
5425 | char *buffer = NULL; | |
93030d83 | 5426 | struct kmem_cache *root_cache; |
107dab5c | 5427 | |
93030d83 | 5428 | if (is_root_cache(s)) |
107dab5c GC |
5429 | return; |
5430 | ||
f7ce3190 | 5431 | root_cache = s->memcg_params.root_cache; |
93030d83 | 5432 | |
107dab5c GC |
5433 | /* |
5434 | * This mean this cache had no attribute written. Therefore, no point | |
5435 | * in copying default values around | |
5436 | */ | |
93030d83 | 5437 | if (!root_cache->max_attr_size) |
107dab5c GC |
5438 | return; |
5439 | ||
5440 | for (i = 0; i < ARRAY_SIZE(slab_attrs); i++) { | |
5441 | char mbuf[64]; | |
5442 | char *buf; | |
5443 | struct slab_attribute *attr = to_slab_attr(slab_attrs[i]); | |
5444 | ||
5445 | if (!attr || !attr->store || !attr->show) | |
5446 | continue; | |
5447 | ||
5448 | /* | |
5449 | * It is really bad that we have to allocate here, so we will | |
5450 | * do it only as a fallback. If we actually allocate, though, | |
5451 | * we can just use the allocated buffer until the end. | |
5452 | * | |
5453 | * Most of the slub attributes will tend to be very small in | |
5454 | * size, but sysfs allows buffers up to a page, so they can | |
5455 | * theoretically happen. | |
5456 | */ | |
5457 | if (buffer) | |
5458 | buf = buffer; | |
93030d83 | 5459 | else if (root_cache->max_attr_size < ARRAY_SIZE(mbuf)) |
107dab5c GC |
5460 | buf = mbuf; |
5461 | else { | |
5462 | buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
5463 | if (WARN_ON(!buffer)) | |
5464 | continue; | |
5465 | buf = buffer; | |
5466 | } | |
5467 | ||
93030d83 | 5468 | attr->show(root_cache, buf); |
107dab5c GC |
5469 | attr->store(s, buf, strlen(buf)); |
5470 | } | |
5471 | ||
5472 | if (buffer) | |
5473 | free_page((unsigned long)buffer); | |
5474 | #endif | |
5475 | } | |
5476 | ||
41a21285 CL |
5477 | static void kmem_cache_release(struct kobject *k) |
5478 | { | |
5479 | slab_kmem_cache_release(to_slab(k)); | |
5480 | } | |
5481 | ||
52cf25d0 | 5482 | static const struct sysfs_ops slab_sysfs_ops = { |
81819f0f CL |
5483 | .show = slab_attr_show, |
5484 | .store = slab_attr_store, | |
5485 | }; | |
5486 | ||
5487 | static struct kobj_type slab_ktype = { | |
5488 | .sysfs_ops = &slab_sysfs_ops, | |
41a21285 | 5489 | .release = kmem_cache_release, |
81819f0f CL |
5490 | }; |
5491 | ||
5492 | static int uevent_filter(struct kset *kset, struct kobject *kobj) | |
5493 | { | |
5494 | struct kobj_type *ktype = get_ktype(kobj); | |
5495 | ||
5496 | if (ktype == &slab_ktype) | |
5497 | return 1; | |
5498 | return 0; | |
5499 | } | |
5500 | ||
9cd43611 | 5501 | static const struct kset_uevent_ops slab_uevent_ops = { |
81819f0f CL |
5502 | .filter = uevent_filter, |
5503 | }; | |
5504 | ||
27c3a314 | 5505 | static struct kset *slab_kset; |
81819f0f | 5506 | |
9a41707b VD |
5507 | static inline struct kset *cache_kset(struct kmem_cache *s) |
5508 | { | |
127424c8 | 5509 | #ifdef CONFIG_MEMCG |
9a41707b | 5510 | if (!is_root_cache(s)) |
f7ce3190 | 5511 | return s->memcg_params.root_cache->memcg_kset; |
9a41707b VD |
5512 | #endif |
5513 | return slab_kset; | |
5514 | } | |
5515 | ||
81819f0f CL |
5516 | #define ID_STR_LENGTH 64 |
5517 | ||
5518 | /* Create a unique string id for a slab cache: | |
6446faa2 CL |
5519 | * |
5520 | * Format :[flags-]size | |
81819f0f CL |
5521 | */ |
5522 | static char *create_unique_id(struct kmem_cache *s) | |
5523 | { | |
5524 | char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL); | |
5525 | char *p = name; | |
5526 | ||
5527 | BUG_ON(!name); | |
5528 | ||
5529 | *p++ = ':'; | |
5530 | /* | |
5531 | * First flags affecting slabcache operations. We will only | |
5532 | * get here for aliasable slabs so we do not need to support | |
5533 | * too many flags. The flags here must cover all flags that | |
5534 | * are matched during merging to guarantee that the id is | |
5535 | * unique. | |
5536 | */ | |
5537 | if (s->flags & SLAB_CACHE_DMA) | |
5538 | *p++ = 'd'; | |
5539 | if (s->flags & SLAB_RECLAIM_ACCOUNT) | |
5540 | *p++ = 'a'; | |
becfda68 | 5541 | if (s->flags & SLAB_CONSISTENCY_CHECKS) |
81819f0f | 5542 | *p++ = 'F'; |
5a896d9e VN |
5543 | if (!(s->flags & SLAB_NOTRACK)) |
5544 | *p++ = 't'; | |
230e9fc2 VD |
5545 | if (s->flags & SLAB_ACCOUNT) |
5546 | *p++ = 'A'; | |
81819f0f CL |
5547 | if (p != name + 1) |
5548 | *p++ = '-'; | |
5549 | p += sprintf(p, "%07d", s->size); | |
2633d7a0 | 5550 | |
81819f0f CL |
5551 | BUG_ON(p > name + ID_STR_LENGTH - 1); |
5552 | return name; | |
5553 | } | |
5554 | ||
5555 | static int sysfs_slab_add(struct kmem_cache *s) | |
5556 | { | |
5557 | int err; | |
5558 | const char *name; | |
45530c44 | 5559 | int unmergeable = slab_unmergeable(s); |
81819f0f | 5560 | |
81819f0f CL |
5561 | if (unmergeable) { |
5562 | /* | |
5563 | * Slabcache can never be merged so we can use the name proper. | |
5564 | * This is typically the case for debug situations. In that | |
5565 | * case we can catch duplicate names easily. | |
5566 | */ | |
27c3a314 | 5567 | sysfs_remove_link(&slab_kset->kobj, s->name); |
81819f0f CL |
5568 | name = s->name; |
5569 | } else { | |
5570 | /* | |
5571 | * Create a unique name for the slab as a target | |
5572 | * for the symlinks. | |
5573 | */ | |
5574 | name = create_unique_id(s); | |
5575 | } | |
5576 | ||
9a41707b | 5577 | s->kobj.kset = cache_kset(s); |
26e4f205 | 5578 | err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name); |
54b6a731 | 5579 | if (err) |
80da026a | 5580 | goto out; |
81819f0f CL |
5581 | |
5582 | err = sysfs_create_group(&s->kobj, &slab_attr_group); | |
54b6a731 DJ |
5583 | if (err) |
5584 | goto out_del_kobj; | |
9a41707b | 5585 | |
127424c8 | 5586 | #ifdef CONFIG_MEMCG |
9a41707b VD |
5587 | if (is_root_cache(s)) { |
5588 | s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj); | |
5589 | if (!s->memcg_kset) { | |
54b6a731 DJ |
5590 | err = -ENOMEM; |
5591 | goto out_del_kobj; | |
9a41707b VD |
5592 | } |
5593 | } | |
5594 | #endif | |
5595 | ||
81819f0f CL |
5596 | kobject_uevent(&s->kobj, KOBJ_ADD); |
5597 | if (!unmergeable) { | |
5598 | /* Setup first alias */ | |
5599 | sysfs_slab_alias(s, s->name); | |
81819f0f | 5600 | } |
54b6a731 DJ |
5601 | out: |
5602 | if (!unmergeable) | |
5603 | kfree(name); | |
5604 | return err; | |
5605 | out_del_kobj: | |
5606 | kobject_del(&s->kobj); | |
54b6a731 | 5607 | goto out; |
81819f0f CL |
5608 | } |
5609 | ||
41a21285 | 5610 | void sysfs_slab_remove(struct kmem_cache *s) |
81819f0f | 5611 | { |
97d06609 | 5612 | if (slab_state < FULL) |
2bce6485 CL |
5613 | /* |
5614 | * Sysfs has not been setup yet so no need to remove the | |
5615 | * cache from sysfs. | |
5616 | */ | |
5617 | return; | |
5618 | ||
127424c8 | 5619 | #ifdef CONFIG_MEMCG |
9a41707b VD |
5620 | kset_unregister(s->memcg_kset); |
5621 | #endif | |
81819f0f CL |
5622 | kobject_uevent(&s->kobj, KOBJ_REMOVE); |
5623 | kobject_del(&s->kobj); | |
151c602f | 5624 | kobject_put(&s->kobj); |
81819f0f CL |
5625 | } |
5626 | ||
5627 | /* | |
5628 | * Need to buffer aliases during bootup until sysfs becomes | |
9f6c708e | 5629 | * available lest we lose that information. |
81819f0f CL |
5630 | */ |
5631 | struct saved_alias { | |
5632 | struct kmem_cache *s; | |
5633 | const char *name; | |
5634 | struct saved_alias *next; | |
5635 | }; | |
5636 | ||
5af328a5 | 5637 | static struct saved_alias *alias_list; |
81819f0f CL |
5638 | |
5639 | static int sysfs_slab_alias(struct kmem_cache *s, const char *name) | |
5640 | { | |
5641 | struct saved_alias *al; | |
5642 | ||
97d06609 | 5643 | if (slab_state == FULL) { |
81819f0f CL |
5644 | /* |
5645 | * If we have a leftover link then remove it. | |
5646 | */ | |
27c3a314 GKH |
5647 | sysfs_remove_link(&slab_kset->kobj, name); |
5648 | return sysfs_create_link(&slab_kset->kobj, &s->kobj, name); | |
81819f0f CL |
5649 | } |
5650 | ||
5651 | al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); | |
5652 | if (!al) | |
5653 | return -ENOMEM; | |
5654 | ||
5655 | al->s = s; | |
5656 | al->name = name; | |
5657 | al->next = alias_list; | |
5658 | alias_list = al; | |
5659 | return 0; | |
5660 | } | |
5661 | ||
5662 | static int __init slab_sysfs_init(void) | |
5663 | { | |
5b95a4ac | 5664 | struct kmem_cache *s; |
81819f0f CL |
5665 | int err; |
5666 | ||
18004c5d | 5667 | mutex_lock(&slab_mutex); |
2bce6485 | 5668 | |
0ff21e46 | 5669 | slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj); |
27c3a314 | 5670 | if (!slab_kset) { |
18004c5d | 5671 | mutex_unlock(&slab_mutex); |
f9f58285 | 5672 | pr_err("Cannot register slab subsystem.\n"); |
81819f0f CL |
5673 | return -ENOSYS; |
5674 | } | |
5675 | ||
97d06609 | 5676 | slab_state = FULL; |
26a7bd03 | 5677 | |
5b95a4ac | 5678 | list_for_each_entry(s, &slab_caches, list) { |
26a7bd03 | 5679 | err = sysfs_slab_add(s); |
5d540fb7 | 5680 | if (err) |
f9f58285 FF |
5681 | pr_err("SLUB: Unable to add boot slab %s to sysfs\n", |
5682 | s->name); | |
26a7bd03 | 5683 | } |
81819f0f CL |
5684 | |
5685 | while (alias_list) { | |
5686 | struct saved_alias *al = alias_list; | |
5687 | ||
5688 | alias_list = alias_list->next; | |
5689 | err = sysfs_slab_alias(al->s, al->name); | |
5d540fb7 | 5690 | if (err) |
f9f58285 FF |
5691 | pr_err("SLUB: Unable to add boot slab alias %s to sysfs\n", |
5692 | al->name); | |
81819f0f CL |
5693 | kfree(al); |
5694 | } | |
5695 | ||
18004c5d | 5696 | mutex_unlock(&slab_mutex); |
81819f0f CL |
5697 | resiliency_test(); |
5698 | return 0; | |
5699 | } | |
5700 | ||
5701 | __initcall(slab_sysfs_init); | |
ab4d5ed5 | 5702 | #endif /* CONFIG_SYSFS */ |
57ed3eda PE |
5703 | |
5704 | /* | |
5705 | * The /proc/slabinfo ABI | |
5706 | */ | |
158a9624 | 5707 | #ifdef CONFIG_SLABINFO |
0d7561c6 | 5708 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo) |
57ed3eda | 5709 | { |
57ed3eda | 5710 | unsigned long nr_slabs = 0; |
205ab99d CL |
5711 | unsigned long nr_objs = 0; |
5712 | unsigned long nr_free = 0; | |
57ed3eda | 5713 | int node; |
fa45dc25 | 5714 | struct kmem_cache_node *n; |
57ed3eda | 5715 | |
fa45dc25 | 5716 | for_each_kmem_cache_node(s, node, n) { |
c17fd13e WL |
5717 | nr_slabs += node_nr_slabs(n); |
5718 | nr_objs += node_nr_objs(n); | |
205ab99d | 5719 | nr_free += count_partial(n, count_free); |
57ed3eda PE |
5720 | } |
5721 | ||
0d7561c6 GC |
5722 | sinfo->active_objs = nr_objs - nr_free; |
5723 | sinfo->num_objs = nr_objs; | |
5724 | sinfo->active_slabs = nr_slabs; | |
5725 | sinfo->num_slabs = nr_slabs; | |
5726 | sinfo->objects_per_slab = oo_objects(s->oo); | |
5727 | sinfo->cache_order = oo_order(s->oo); | |
57ed3eda PE |
5728 | } |
5729 | ||
0d7561c6 | 5730 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s) |
7b3c3a50 | 5731 | { |
7b3c3a50 AD |
5732 | } |
5733 | ||
b7454ad3 GC |
5734 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
5735 | size_t count, loff_t *ppos) | |
7b3c3a50 | 5736 | { |
b7454ad3 | 5737 | return -EIO; |
7b3c3a50 | 5738 | } |
158a9624 | 5739 | #endif /* CONFIG_SLABINFO */ |