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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
81819f0f CL |
2 | /* |
3 | * SLUB: A slab allocator that limits cache line use instead of queuing | |
4 | * objects in per cpu and per node lists. | |
5 | * | |
dc84207d | 6 | * The allocator synchronizes using per slab locks or atomic operations |
881db7fb | 7 | * and only uses a centralized lock to manage a pool of partial slabs. |
81819f0f | 8 | * |
cde53535 | 9 | * (C) 2007 SGI, Christoph Lameter |
881db7fb | 10 | * (C) 2011 Linux Foundation, Christoph Lameter |
81819f0f CL |
11 | */ |
12 | ||
13 | #include <linux/mm.h> | |
1eb5ac64 | 14 | #include <linux/swap.h> /* struct reclaim_state */ |
81819f0f CL |
15 | #include <linux/module.h> |
16 | #include <linux/bit_spinlock.h> | |
17 | #include <linux/interrupt.h> | |
1b3865d0 | 18 | #include <linux/swab.h> |
81819f0f CL |
19 | #include <linux/bitops.h> |
20 | #include <linux/slab.h> | |
97d06609 | 21 | #include "slab.h" |
7b3c3a50 | 22 | #include <linux/proc_fs.h> |
81819f0f | 23 | #include <linux/seq_file.h> |
a79316c6 | 24 | #include <linux/kasan.h> |
81819f0f CL |
25 | #include <linux/cpu.h> |
26 | #include <linux/cpuset.h> | |
27 | #include <linux/mempolicy.h> | |
28 | #include <linux/ctype.h> | |
78869146 | 29 | #include <linux/stackdepot.h> |
3ac7fe5a | 30 | #include <linux/debugobjects.h> |
81819f0f | 31 | #include <linux/kallsyms.h> |
b89fb5ef | 32 | #include <linux/kfence.h> |
b9049e23 | 33 | #include <linux/memory.h> |
f8bd2258 | 34 | #include <linux/math64.h> |
773ff60e | 35 | #include <linux/fault-inject.h> |
bfa71457 | 36 | #include <linux/stacktrace.h> |
4de900b4 | 37 | #include <linux/prefetch.h> |
2633d7a0 | 38 | #include <linux/memcontrol.h> |
2482ddec | 39 | #include <linux/random.h> |
1f9f78b1 | 40 | #include <kunit/test.h> |
81819f0f | 41 | |
64dd6849 | 42 | #include <linux/debugfs.h> |
4a92379b RK |
43 | #include <trace/events/kmem.h> |
44 | ||
072bb0aa MG |
45 | #include "internal.h" |
46 | ||
81819f0f CL |
47 | /* |
48 | * Lock order: | |
18004c5d | 49 | * 1. slab_mutex (Global Mutex) |
881db7fb CL |
50 | * 2. node->list_lock |
51 | * 3. slab_lock(page) (Only on some arches and for debugging) | |
81819f0f | 52 | * |
18004c5d | 53 | * slab_mutex |
881db7fb | 54 | * |
18004c5d | 55 | * The role of the slab_mutex is to protect the list of all the slabs |
881db7fb CL |
56 | * and to synchronize major metadata changes to slab cache structures. |
57 | * | |
58 | * The slab_lock is only used for debugging and on arches that do not | |
b7ccc7f8 | 59 | * have the ability to do a cmpxchg_double. It only protects: |
881db7fb | 60 | * A. page->freelist -> List of object free in a page |
b7ccc7f8 MW |
61 | * B. page->inuse -> Number of objects in use |
62 | * C. page->objects -> Number of objects in page | |
63 | * D. page->frozen -> frozen state | |
881db7fb CL |
64 | * |
65 | * If a slab is frozen then it is exempt from list management. It is not | |
632b2ef0 LX |
66 | * on any list except per cpu partial list. The processor that froze the |
67 | * slab is the one who can perform list operations on the page. Other | |
68 | * processors may put objects onto the freelist but the processor that | |
69 | * froze the slab is the only one that can retrieve the objects from the | |
70 | * page's freelist. | |
81819f0f CL |
71 | * |
72 | * The list_lock protects the partial and full list on each node and | |
73 | * the partial slab counter. If taken then no new slabs may be added or | |
74 | * removed from the lists nor make the number of partial slabs be modified. | |
75 | * (Note that the total number of slabs is an atomic value that may be | |
76 | * modified without taking the list lock). | |
77 | * | |
78 | * The list_lock is a centralized lock and thus we avoid taking it as | |
79 | * much as possible. As long as SLUB does not have to handle partial | |
80 | * slabs, operations can continue without any centralized lock. F.e. | |
81 | * allocating a long series of objects that fill up slabs does not require | |
82 | * the list lock. | |
81819f0f CL |
83 | * Interrupts are disabled during allocation and deallocation in order to |
84 | * make the slab allocator safe to use in the context of an irq. In addition | |
85 | * interrupts are disabled to ensure that the processor does not change | |
86 | * while handling per_cpu slabs, due to kernel preemption. | |
87 | * | |
88 | * SLUB assigns one slab for allocation to each processor. | |
89 | * Allocations only occur from these slabs called cpu slabs. | |
90 | * | |
672bba3a CL |
91 | * Slabs with free elements are kept on a partial list and during regular |
92 | * operations no list for full slabs is used. If an object in a full slab is | |
81819f0f | 93 | * freed then the slab will show up again on the partial lists. |
672bba3a CL |
94 | * We track full slabs for debugging purposes though because otherwise we |
95 | * cannot scan all objects. | |
81819f0f CL |
96 | * |
97 | * Slabs are freed when they become empty. Teardown and setup is | |
98 | * minimal so we rely on the page allocators per cpu caches for | |
99 | * fast frees and allocs. | |
100 | * | |
aed68148 | 101 | * page->frozen The slab is frozen and exempt from list processing. |
4b6f0750 CL |
102 | * This means that the slab is dedicated to a purpose |
103 | * such as satisfying allocations for a specific | |
104 | * processor. Objects may be freed in the slab while | |
105 | * it is frozen but slab_free will then skip the usual | |
106 | * list operations. It is up to the processor holding | |
107 | * the slab to integrate the slab into the slab lists | |
108 | * when the slab is no longer needed. | |
109 | * | |
110 | * One use of this flag is to mark slabs that are | |
111 | * used for allocations. Then such a slab becomes a cpu | |
112 | * slab. The cpu slab may be equipped with an additional | |
dfb4f096 | 113 | * freelist that allows lockless access to |
894b8788 CL |
114 | * free objects in addition to the regular freelist |
115 | * that requires the slab lock. | |
81819f0f | 116 | * |
aed68148 | 117 | * SLAB_DEBUG_FLAGS Slab requires special handling due to debug |
81819f0f | 118 | * options set. This moves slab handling out of |
894b8788 | 119 | * the fast path and disables lockless freelists. |
81819f0f CL |
120 | */ |
121 | ||
ca0cab65 VB |
122 | #ifdef CONFIG_SLUB_DEBUG |
123 | #ifdef CONFIG_SLUB_DEBUG_ON | |
124 | DEFINE_STATIC_KEY_TRUE(slub_debug_enabled); | |
125 | #else | |
126 | DEFINE_STATIC_KEY_FALSE(slub_debug_enabled); | |
127 | #endif | |
79270291 | 128 | #endif /* CONFIG_SLUB_DEBUG */ |
ca0cab65 | 129 | |
59052e89 VB |
130 | static inline bool kmem_cache_debug(struct kmem_cache *s) |
131 | { | |
132 | return kmem_cache_debug_flags(s, SLAB_DEBUG_FLAGS); | |
af537b0a | 133 | } |
5577bd8a | 134 | |
117d54df | 135 | void *fixup_red_left(struct kmem_cache *s, void *p) |
d86bd1be | 136 | { |
59052e89 | 137 | if (kmem_cache_debug_flags(s, SLAB_RED_ZONE)) |
d86bd1be JK |
138 | p += s->red_left_pad; |
139 | ||
140 | return p; | |
141 | } | |
142 | ||
345c905d JK |
143 | static inline bool kmem_cache_has_cpu_partial(struct kmem_cache *s) |
144 | { | |
145 | #ifdef CONFIG_SLUB_CPU_PARTIAL | |
146 | return !kmem_cache_debug(s); | |
147 | #else | |
148 | return false; | |
149 | #endif | |
150 | } | |
151 | ||
81819f0f CL |
152 | /* |
153 | * Issues still to be resolved: | |
154 | * | |
81819f0f CL |
155 | * - Support PAGE_ALLOC_DEBUG. Should be easy to do. |
156 | * | |
81819f0f CL |
157 | * - Variable sizing of the per node arrays |
158 | */ | |
159 | ||
b789ef51 CL |
160 | /* Enable to log cmpxchg failures */ |
161 | #undef SLUB_DEBUG_CMPXCHG | |
162 | ||
2086d26a | 163 | /* |
dc84207d | 164 | * Minimum number of partial slabs. These will be left on the partial |
2086d26a CL |
165 | * lists even if they are empty. kmem_cache_shrink may reclaim them. |
166 | */ | |
76be8950 | 167 | #define MIN_PARTIAL 5 |
e95eed57 | 168 | |
2086d26a CL |
169 | /* |
170 | * Maximum number of desirable partial slabs. | |
171 | * The existence of more partial slabs makes kmem_cache_shrink | |
721ae22a | 172 | * sort the partial list by the number of objects in use. |
2086d26a CL |
173 | */ |
174 | #define MAX_PARTIAL 10 | |
175 | ||
becfda68 | 176 | #define DEBUG_DEFAULT_FLAGS (SLAB_CONSISTENCY_CHECKS | SLAB_RED_ZONE | \ |
81819f0f | 177 | SLAB_POISON | SLAB_STORE_USER) |
672bba3a | 178 | |
149daaf3 LA |
179 | /* |
180 | * These debug flags cannot use CMPXCHG because there might be consistency | |
181 | * issues when checking or reading debug information | |
182 | */ | |
183 | #define SLAB_NO_CMPXCHG (SLAB_CONSISTENCY_CHECKS | SLAB_STORE_USER | \ | |
184 | SLAB_TRACE) | |
185 | ||
186 | ||
fa5ec8a1 | 187 | /* |
3de47213 DR |
188 | * Debugging flags that require metadata to be stored in the slab. These get |
189 | * disabled when slub_debug=O is used and a cache's min order increases with | |
190 | * metadata. | |
fa5ec8a1 | 191 | */ |
3de47213 | 192 | #define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
fa5ec8a1 | 193 | |
210b5c06 CG |
194 | #define OO_SHIFT 16 |
195 | #define OO_MASK ((1 << OO_SHIFT) - 1) | |
50d5c41c | 196 | #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */ |
210b5c06 | 197 | |
81819f0f | 198 | /* Internal SLUB flags */ |
d50112ed | 199 | /* Poison object */ |
4fd0b46e | 200 | #define __OBJECT_POISON ((slab_flags_t __force)0x80000000U) |
d50112ed | 201 | /* Use cmpxchg_double */ |
4fd0b46e | 202 | #define __CMPXCHG_DOUBLE ((slab_flags_t __force)0x40000000U) |
81819f0f | 203 | |
02cbc874 CL |
204 | /* |
205 | * Tracking user of a slab. | |
206 | */ | |
d6543e39 | 207 | #define TRACK_ADDRS_COUNT 16 |
02cbc874 | 208 | struct track { |
ce71e27c | 209 | unsigned long addr; /* Called from address */ |
78869146 OG |
210 | #ifdef CONFIG_STACKDEPOT |
211 | depot_stack_handle_t handle; | |
d6543e39 | 212 | #endif |
02cbc874 CL |
213 | int cpu; /* Was running on cpu */ |
214 | int pid; /* Pid context */ | |
215 | unsigned long when; /* When did the operation occur */ | |
216 | }; | |
217 | ||
218 | enum track_item { TRACK_ALLOC, TRACK_FREE }; | |
219 | ||
ab4d5ed5 | 220 | #ifdef CONFIG_SYSFS |
81819f0f CL |
221 | static int sysfs_slab_add(struct kmem_cache *); |
222 | static int sysfs_slab_alias(struct kmem_cache *, const char *); | |
81819f0f | 223 | #else |
0c710013 CL |
224 | static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } |
225 | static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) | |
226 | { return 0; } | |
81819f0f CL |
227 | #endif |
228 | ||
64dd6849 FM |
229 | #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) |
230 | static void debugfs_slab_add(struct kmem_cache *); | |
231 | #else | |
232 | static inline void debugfs_slab_add(struct kmem_cache *s) { } | |
233 | #endif | |
234 | ||
4fdccdfb | 235 | static inline void stat(const struct kmem_cache *s, enum stat_item si) |
8ff12cfc CL |
236 | { |
237 | #ifdef CONFIG_SLUB_STATS | |
88da03a6 CL |
238 | /* |
239 | * The rmw is racy on a preemptible kernel but this is acceptable, so | |
240 | * avoid this_cpu_add()'s irq-disable overhead. | |
241 | */ | |
242 | raw_cpu_inc(s->cpu_slab->stat[si]); | |
8ff12cfc CL |
243 | #endif |
244 | } | |
245 | ||
7e1fa93d VB |
246 | /* |
247 | * Tracks for which NUMA nodes we have kmem_cache_nodes allocated. | |
248 | * Corresponds to node_state[N_NORMAL_MEMORY], but can temporarily | |
249 | * differ during memory hotplug/hotremove operations. | |
250 | * Protected by slab_mutex. | |
251 | */ | |
252 | static nodemask_t slab_nodes; | |
253 | ||
81819f0f CL |
254 | /******************************************************************** |
255 | * Core slab cache functions | |
256 | *******************************************************************/ | |
257 | ||
2482ddec KC |
258 | /* |
259 | * Returns freelist pointer (ptr). With hardening, this is obfuscated | |
260 | * with an XOR of the address where the pointer is held and a per-cache | |
261 | * random number. | |
262 | */ | |
263 | static inline void *freelist_ptr(const struct kmem_cache *s, void *ptr, | |
264 | unsigned long ptr_addr) | |
265 | { | |
266 | #ifdef CONFIG_SLAB_FREELIST_HARDENED | |
d36a63a9 | 267 | /* |
aa1ef4d7 | 268 | * When CONFIG_KASAN_SW/HW_TAGS is enabled, ptr_addr might be tagged. |
d36a63a9 AK |
269 | * Normally, this doesn't cause any issues, as both set_freepointer() |
270 | * and get_freepointer() are called with a pointer with the same tag. | |
271 | * However, there are some issues with CONFIG_SLUB_DEBUG code. For | |
272 | * example, when __free_slub() iterates over objects in a cache, it | |
273 | * passes untagged pointers to check_object(). check_object() in turns | |
274 | * calls get_freepointer() with an untagged pointer, which causes the | |
275 | * freepointer to be restored incorrectly. | |
276 | */ | |
277 | return (void *)((unsigned long)ptr ^ s->random ^ | |
1ad53d9f | 278 | swab((unsigned long)kasan_reset_tag((void *)ptr_addr))); |
2482ddec KC |
279 | #else |
280 | return ptr; | |
281 | #endif | |
282 | } | |
283 | ||
284 | /* Returns the freelist pointer recorded at location ptr_addr. */ | |
285 | static inline void *freelist_dereference(const struct kmem_cache *s, | |
286 | void *ptr_addr) | |
287 | { | |
288 | return freelist_ptr(s, (void *)*(unsigned long *)(ptr_addr), | |
289 | (unsigned long)ptr_addr); | |
290 | } | |
291 | ||
7656c72b CL |
292 | static inline void *get_freepointer(struct kmem_cache *s, void *object) |
293 | { | |
aa1ef4d7 | 294 | object = kasan_reset_tag(object); |
2482ddec | 295 | return freelist_dereference(s, object + s->offset); |
7656c72b CL |
296 | } |
297 | ||
0ad9500e ED |
298 | static void prefetch_freepointer(const struct kmem_cache *s, void *object) |
299 | { | |
0882ff91 | 300 | prefetch(object + s->offset); |
0ad9500e ED |
301 | } |
302 | ||
1393d9a1 CL |
303 | static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) |
304 | { | |
2482ddec | 305 | unsigned long freepointer_addr; |
1393d9a1 CL |
306 | void *p; |
307 | ||
8e57f8ac | 308 | if (!debug_pagealloc_enabled_static()) |
922d566c JK |
309 | return get_freepointer(s, object); |
310 | ||
f70b0049 | 311 | object = kasan_reset_tag(object); |
2482ddec | 312 | freepointer_addr = (unsigned long)object + s->offset; |
fe557319 | 313 | copy_from_kernel_nofault(&p, (void **)freepointer_addr, sizeof(p)); |
2482ddec | 314 | return freelist_ptr(s, p, freepointer_addr); |
1393d9a1 CL |
315 | } |
316 | ||
7656c72b CL |
317 | static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) |
318 | { | |
2482ddec KC |
319 | unsigned long freeptr_addr = (unsigned long)object + s->offset; |
320 | ||
ce6fa91b AP |
321 | #ifdef CONFIG_SLAB_FREELIST_HARDENED |
322 | BUG_ON(object == fp); /* naive detection of double free or corruption */ | |
323 | #endif | |
324 | ||
aa1ef4d7 | 325 | freeptr_addr = (unsigned long)kasan_reset_tag((void *)freeptr_addr); |
2482ddec | 326 | *(void **)freeptr_addr = freelist_ptr(s, fp, freeptr_addr); |
7656c72b CL |
327 | } |
328 | ||
329 | /* Loop over all objects in a slab */ | |
224a88be | 330 | #define for_each_object(__p, __s, __addr, __objects) \ |
d86bd1be JK |
331 | for (__p = fixup_red_left(__s, __addr); \ |
332 | __p < (__addr) + (__objects) * (__s)->size; \ | |
333 | __p += (__s)->size) | |
7656c72b | 334 | |
9736d2a9 | 335 | static inline unsigned int order_objects(unsigned int order, unsigned int size) |
ab9a0f19 | 336 | { |
9736d2a9 | 337 | return ((unsigned int)PAGE_SIZE << order) / size; |
ab9a0f19 LJ |
338 | } |
339 | ||
19af27af | 340 | static inline struct kmem_cache_order_objects oo_make(unsigned int order, |
9736d2a9 | 341 | unsigned int size) |
834f3d11 CL |
342 | { |
343 | struct kmem_cache_order_objects x = { | |
9736d2a9 | 344 | (order << OO_SHIFT) + order_objects(order, size) |
834f3d11 CL |
345 | }; |
346 | ||
347 | return x; | |
348 | } | |
349 | ||
19af27af | 350 | static inline unsigned int oo_order(struct kmem_cache_order_objects x) |
834f3d11 | 351 | { |
210b5c06 | 352 | return x.x >> OO_SHIFT; |
834f3d11 CL |
353 | } |
354 | ||
19af27af | 355 | static inline unsigned int oo_objects(struct kmem_cache_order_objects x) |
834f3d11 | 356 | { |
210b5c06 | 357 | return x.x & OO_MASK; |
834f3d11 CL |
358 | } |
359 | ||
881db7fb CL |
360 | /* |
361 | * Per slab locking using the pagelock | |
362 | */ | |
363 | static __always_inline void slab_lock(struct page *page) | |
364 | { | |
48c935ad | 365 | VM_BUG_ON_PAGE(PageTail(page), page); |
881db7fb CL |
366 | bit_spin_lock(PG_locked, &page->flags); |
367 | } | |
368 | ||
369 | static __always_inline void slab_unlock(struct page *page) | |
370 | { | |
48c935ad | 371 | VM_BUG_ON_PAGE(PageTail(page), page); |
881db7fb CL |
372 | __bit_spin_unlock(PG_locked, &page->flags); |
373 | } | |
374 | ||
1d07171c CL |
375 | /* Interrupts must be disabled (for the fallback code to work right) */ |
376 | static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page, | |
377 | void *freelist_old, unsigned long counters_old, | |
378 | void *freelist_new, unsigned long counters_new, | |
379 | const char *n) | |
380 | { | |
381 | VM_BUG_ON(!irqs_disabled()); | |
2565409f HC |
382 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
383 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
1d07171c | 384 | if (s->flags & __CMPXCHG_DOUBLE) { |
cdcd6298 | 385 | if (cmpxchg_double(&page->freelist, &page->counters, |
0aa9a13d DC |
386 | freelist_old, counters_old, |
387 | freelist_new, counters_new)) | |
6f6528a1 | 388 | return true; |
1d07171c CL |
389 | } else |
390 | #endif | |
391 | { | |
392 | slab_lock(page); | |
d0e0ac97 CG |
393 | if (page->freelist == freelist_old && |
394 | page->counters == counters_old) { | |
1d07171c | 395 | page->freelist = freelist_new; |
7d27a04b | 396 | page->counters = counters_new; |
1d07171c | 397 | slab_unlock(page); |
6f6528a1 | 398 | return true; |
1d07171c CL |
399 | } |
400 | slab_unlock(page); | |
401 | } | |
402 | ||
403 | cpu_relax(); | |
404 | stat(s, CMPXCHG_DOUBLE_FAIL); | |
405 | ||
406 | #ifdef SLUB_DEBUG_CMPXCHG | |
f9f58285 | 407 | pr_info("%s %s: cmpxchg double redo ", n, s->name); |
1d07171c CL |
408 | #endif |
409 | ||
6f6528a1 | 410 | return false; |
1d07171c CL |
411 | } |
412 | ||
b789ef51 CL |
413 | static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
414 | void *freelist_old, unsigned long counters_old, | |
415 | void *freelist_new, unsigned long counters_new, | |
416 | const char *n) | |
417 | { | |
2565409f HC |
418 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
419 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
b789ef51 | 420 | if (s->flags & __CMPXCHG_DOUBLE) { |
cdcd6298 | 421 | if (cmpxchg_double(&page->freelist, &page->counters, |
0aa9a13d DC |
422 | freelist_old, counters_old, |
423 | freelist_new, counters_new)) | |
6f6528a1 | 424 | return true; |
b789ef51 CL |
425 | } else |
426 | #endif | |
427 | { | |
1d07171c CL |
428 | unsigned long flags; |
429 | ||
430 | local_irq_save(flags); | |
881db7fb | 431 | slab_lock(page); |
d0e0ac97 CG |
432 | if (page->freelist == freelist_old && |
433 | page->counters == counters_old) { | |
b789ef51 | 434 | page->freelist = freelist_new; |
7d27a04b | 435 | page->counters = counters_new; |
881db7fb | 436 | slab_unlock(page); |
1d07171c | 437 | local_irq_restore(flags); |
6f6528a1 | 438 | return true; |
b789ef51 | 439 | } |
881db7fb | 440 | slab_unlock(page); |
1d07171c | 441 | local_irq_restore(flags); |
b789ef51 CL |
442 | } |
443 | ||
444 | cpu_relax(); | |
445 | stat(s, CMPXCHG_DOUBLE_FAIL); | |
446 | ||
447 | #ifdef SLUB_DEBUG_CMPXCHG | |
f9f58285 | 448 | pr_info("%s %s: cmpxchg double redo ", n, s->name); |
b789ef51 CL |
449 | #endif |
450 | ||
6f6528a1 | 451 | return false; |
b789ef51 CL |
452 | } |
453 | ||
41ecc55b | 454 | #ifdef CONFIG_SLUB_DEBUG |
90e9f6a6 YZ |
455 | static unsigned long object_map[BITS_TO_LONGS(MAX_OBJS_PER_PAGE)]; |
456 | static DEFINE_SPINLOCK(object_map_lock); | |
457 | ||
1f9f78b1 OG |
458 | #if IS_ENABLED(CONFIG_KUNIT) |
459 | static bool slab_add_kunit_errors(void) | |
460 | { | |
461 | struct kunit_resource *resource; | |
462 | ||
463 | if (likely(!current->kunit_test)) | |
464 | return false; | |
465 | ||
466 | resource = kunit_find_named_resource(current->kunit_test, "slab_errors"); | |
467 | if (!resource) | |
468 | return false; | |
469 | ||
470 | (*(int *)resource->data)++; | |
471 | kunit_put_resource(resource); | |
472 | return true; | |
473 | } | |
474 | #else | |
475 | static inline bool slab_add_kunit_errors(void) { return false; } | |
476 | #endif | |
477 | ||
5f80b13a CL |
478 | /* |
479 | * Determine a map of object in use on a page. | |
480 | * | |
881db7fb | 481 | * Node listlock must be held to guarantee that the page does |
5f80b13a CL |
482 | * not vanish from under us. |
483 | */ | |
90e9f6a6 | 484 | static unsigned long *get_map(struct kmem_cache *s, struct page *page) |
31364c2e | 485 | __acquires(&object_map_lock) |
5f80b13a CL |
486 | { |
487 | void *p; | |
488 | void *addr = page_address(page); | |
489 | ||
90e9f6a6 YZ |
490 | VM_BUG_ON(!irqs_disabled()); |
491 | ||
492 | spin_lock(&object_map_lock); | |
493 | ||
494 | bitmap_zero(object_map, page->objects); | |
495 | ||
5f80b13a | 496 | for (p = page->freelist; p; p = get_freepointer(s, p)) |
4138fdfc | 497 | set_bit(__obj_to_index(s, addr, p), object_map); |
90e9f6a6 YZ |
498 | |
499 | return object_map; | |
500 | } | |
501 | ||
81aba9e0 | 502 | static void put_map(unsigned long *map) __releases(&object_map_lock) |
90e9f6a6 YZ |
503 | { |
504 | VM_BUG_ON(map != object_map); | |
90e9f6a6 | 505 | spin_unlock(&object_map_lock); |
5f80b13a CL |
506 | } |
507 | ||
870b1fbb | 508 | static inline unsigned int size_from_object(struct kmem_cache *s) |
d86bd1be JK |
509 | { |
510 | if (s->flags & SLAB_RED_ZONE) | |
511 | return s->size - s->red_left_pad; | |
512 | ||
513 | return s->size; | |
514 | } | |
515 | ||
516 | static inline void *restore_red_left(struct kmem_cache *s, void *p) | |
517 | { | |
518 | if (s->flags & SLAB_RED_ZONE) | |
519 | p -= s->red_left_pad; | |
520 | ||
521 | return p; | |
522 | } | |
523 | ||
41ecc55b CL |
524 | /* |
525 | * Debug settings: | |
526 | */ | |
89d3c87e | 527 | #if defined(CONFIG_SLUB_DEBUG_ON) |
d50112ed | 528 | static slab_flags_t slub_debug = DEBUG_DEFAULT_FLAGS; |
f0630fff | 529 | #else |
d50112ed | 530 | static slab_flags_t slub_debug; |
f0630fff | 531 | #endif |
41ecc55b | 532 | |
e17f1dfb | 533 | static char *slub_debug_string; |
fa5ec8a1 | 534 | static int disable_higher_order_debug; |
41ecc55b | 535 | |
a79316c6 AR |
536 | /* |
537 | * slub is about to manipulate internal object metadata. This memory lies | |
538 | * outside the range of the allocated object, so accessing it would normally | |
539 | * be reported by kasan as a bounds error. metadata_access_enable() is used | |
540 | * to tell kasan that these accesses are OK. | |
541 | */ | |
542 | static inline void metadata_access_enable(void) | |
543 | { | |
544 | kasan_disable_current(); | |
545 | } | |
546 | ||
547 | static inline void metadata_access_disable(void) | |
548 | { | |
549 | kasan_enable_current(); | |
550 | } | |
551 | ||
81819f0f CL |
552 | /* |
553 | * Object debugging | |
554 | */ | |
d86bd1be JK |
555 | |
556 | /* Verify that a pointer has an address that is valid within a slab page */ | |
557 | static inline int check_valid_pointer(struct kmem_cache *s, | |
558 | struct page *page, void *object) | |
559 | { | |
560 | void *base; | |
561 | ||
562 | if (!object) | |
563 | return 1; | |
564 | ||
565 | base = page_address(page); | |
338cfaad | 566 | object = kasan_reset_tag(object); |
d86bd1be JK |
567 | object = restore_red_left(s, object); |
568 | if (object < base || object >= base + page->objects * s->size || | |
569 | (object - base) % s->size) { | |
570 | return 0; | |
571 | } | |
572 | ||
573 | return 1; | |
574 | } | |
575 | ||
aa2efd5e DT |
576 | static void print_section(char *level, char *text, u8 *addr, |
577 | unsigned int length) | |
81819f0f | 578 | { |
a79316c6 | 579 | metadata_access_enable(); |
aa1ef4d7 AK |
580 | print_hex_dump(level, kasan_reset_tag(text), DUMP_PREFIX_ADDRESS, |
581 | 16, 1, addr, length, 1); | |
a79316c6 | 582 | metadata_access_disable(); |
81819f0f CL |
583 | } |
584 | ||
cbfc35a4 WL |
585 | /* |
586 | * See comment in calculate_sizes(). | |
587 | */ | |
588 | static inline bool freeptr_outside_object(struct kmem_cache *s) | |
589 | { | |
590 | return s->offset >= s->inuse; | |
591 | } | |
592 | ||
593 | /* | |
594 | * Return offset of the end of info block which is inuse + free pointer if | |
595 | * not overlapping with object. | |
596 | */ | |
597 | static inline unsigned int get_info_end(struct kmem_cache *s) | |
598 | { | |
599 | if (freeptr_outside_object(s)) | |
600 | return s->inuse + sizeof(void *); | |
601 | else | |
602 | return s->inuse; | |
603 | } | |
604 | ||
81819f0f CL |
605 | static struct track *get_track(struct kmem_cache *s, void *object, |
606 | enum track_item alloc) | |
607 | { | |
608 | struct track *p; | |
609 | ||
cbfc35a4 | 610 | p = object + get_info_end(s); |
81819f0f | 611 | |
aa1ef4d7 | 612 | return kasan_reset_tag(p + alloc); |
81819f0f CL |
613 | } |
614 | ||
78869146 OG |
615 | #ifdef CONFIG_STACKDEPOT |
616 | static depot_stack_handle_t save_stack_depot_trace(gfp_t flags) | |
617 | { | |
618 | unsigned long entries[TRACK_ADDRS_COUNT]; | |
619 | depot_stack_handle_t handle; | |
620 | unsigned int nr_entries; | |
621 | ||
622 | nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 4); | |
623 | handle = stack_depot_save(entries, nr_entries, flags); | |
624 | return handle; | |
625 | } | |
626 | #endif | |
627 | ||
81819f0f | 628 | static void set_track(struct kmem_cache *s, void *object, |
ce71e27c | 629 | enum track_item alloc, unsigned long addr) |
81819f0f | 630 | { |
1a00df4a | 631 | struct track *p = get_track(s, object, alloc); |
81819f0f | 632 | |
81819f0f | 633 | if (addr) { |
78869146 OG |
634 | #ifdef CONFIG_STACKDEPOT |
635 | p->handle = save_stack_depot_trace(GFP_NOWAIT); | |
d6543e39 | 636 | #endif |
81819f0f CL |
637 | p->addr = addr; |
638 | p->cpu = smp_processor_id(); | |
88e4ccf2 | 639 | p->pid = current->pid; |
81819f0f | 640 | p->when = jiffies; |
b8ca7ff7 | 641 | } else { |
81819f0f | 642 | memset(p, 0, sizeof(struct track)); |
b8ca7ff7 | 643 | } |
81819f0f CL |
644 | } |
645 | ||
81819f0f CL |
646 | static void init_tracking(struct kmem_cache *s, void *object) |
647 | { | |
24922684 CL |
648 | if (!(s->flags & SLAB_STORE_USER)) |
649 | return; | |
650 | ||
ce71e27c EGM |
651 | set_track(s, object, TRACK_FREE, 0UL); |
652 | set_track(s, object, TRACK_ALLOC, 0UL); | |
81819f0f CL |
653 | } |
654 | ||
86609d33 | 655 | static void print_track(const char *s, struct track *t, unsigned long pr_time) |
81819f0f CL |
656 | { |
657 | if (!t->addr) | |
658 | return; | |
659 | ||
96b94abc | 660 | pr_err("%s in %pS age=%lu cpu=%u pid=%d\n", |
86609d33 | 661 | s, (void *)t->addr, pr_time - t->when, t->cpu, t->pid); |
78869146 | 662 | #ifdef CONFIG_STACKDEPOT |
d6543e39 | 663 | { |
78869146 OG |
664 | depot_stack_handle_t handle; |
665 | unsigned long *entries; | |
666 | unsigned int nr_entries; | |
667 | ||
668 | handle = READ_ONCE(t->handle); | |
669 | if (!handle) { | |
670 | pr_err("object allocation/free stack trace missing\n"); | |
671 | } else { | |
672 | nr_entries = stack_depot_fetch(handle, &entries); | |
673 | stack_trace_print(entries, nr_entries, 0); | |
674 | } | |
d6543e39 BG |
675 | } |
676 | #endif | |
24922684 CL |
677 | } |
678 | ||
e42f174e | 679 | void print_tracking(struct kmem_cache *s, void *object) |
24922684 | 680 | { |
86609d33 | 681 | unsigned long pr_time = jiffies; |
24922684 CL |
682 | if (!(s->flags & SLAB_STORE_USER)) |
683 | return; | |
684 | ||
86609d33 CP |
685 | print_track("Allocated", get_track(s, object, TRACK_ALLOC), pr_time); |
686 | print_track("Freed", get_track(s, object, TRACK_FREE), pr_time); | |
24922684 CL |
687 | } |
688 | ||
689 | static void print_page_info(struct page *page) | |
690 | { | |
96b94abc | 691 | pr_err("Slab 0x%p objects=%u used=%u fp=0x%p flags=%#lx(%pGp)\n", |
4a8ef190 YS |
692 | page, page->objects, page->inuse, page->freelist, |
693 | page->flags, &page->flags); | |
24922684 CL |
694 | |
695 | } | |
696 | ||
697 | static void slab_bug(struct kmem_cache *s, char *fmt, ...) | |
698 | { | |
ecc42fbe | 699 | struct va_format vaf; |
24922684 | 700 | va_list args; |
24922684 CL |
701 | |
702 | va_start(args, fmt); | |
ecc42fbe FF |
703 | vaf.fmt = fmt; |
704 | vaf.va = &args; | |
f9f58285 | 705 | pr_err("=============================================================================\n"); |
ecc42fbe | 706 | pr_err("BUG %s (%s): %pV\n", s->name, print_tainted(), &vaf); |
f9f58285 | 707 | pr_err("-----------------------------------------------------------------------------\n\n"); |
ecc42fbe | 708 | va_end(args); |
81819f0f CL |
709 | } |
710 | ||
582d1212 | 711 | __printf(2, 3) |
24922684 CL |
712 | static void slab_fix(struct kmem_cache *s, char *fmt, ...) |
713 | { | |
ecc42fbe | 714 | struct va_format vaf; |
24922684 | 715 | va_list args; |
24922684 | 716 | |
1f9f78b1 OG |
717 | if (slab_add_kunit_errors()) |
718 | return; | |
719 | ||
24922684 | 720 | va_start(args, fmt); |
ecc42fbe FF |
721 | vaf.fmt = fmt; |
722 | vaf.va = &args; | |
723 | pr_err("FIX %s: %pV\n", s->name, &vaf); | |
24922684 | 724 | va_end(args); |
24922684 CL |
725 | } |
726 | ||
52f23478 | 727 | static bool freelist_corrupted(struct kmem_cache *s, struct page *page, |
dc07a728 | 728 | void **freelist, void *nextfree) |
52f23478 DZ |
729 | { |
730 | if ((s->flags & SLAB_CONSISTENCY_CHECKS) && | |
dc07a728 ER |
731 | !check_valid_pointer(s, page, nextfree) && freelist) { |
732 | object_err(s, page, *freelist, "Freechain corrupt"); | |
733 | *freelist = NULL; | |
52f23478 DZ |
734 | slab_fix(s, "Isolate corrupted freechain"); |
735 | return true; | |
736 | } | |
737 | ||
738 | return false; | |
739 | } | |
740 | ||
24922684 | 741 | static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) |
81819f0f CL |
742 | { |
743 | unsigned int off; /* Offset of last byte */ | |
a973e9dd | 744 | u8 *addr = page_address(page); |
24922684 CL |
745 | |
746 | print_tracking(s, p); | |
747 | ||
748 | print_page_info(page); | |
749 | ||
96b94abc | 750 | pr_err("Object 0x%p @offset=%tu fp=0x%p\n\n", |
f9f58285 | 751 | p, p - addr, get_freepointer(s, p)); |
24922684 | 752 | |
d86bd1be | 753 | if (s->flags & SLAB_RED_ZONE) |
8669dbab | 754 | print_section(KERN_ERR, "Redzone ", p - s->red_left_pad, |
aa2efd5e | 755 | s->red_left_pad); |
d86bd1be | 756 | else if (p > addr + 16) |
aa2efd5e | 757 | print_section(KERN_ERR, "Bytes b4 ", p - 16, 16); |
81819f0f | 758 | |
8669dbab | 759 | print_section(KERN_ERR, "Object ", p, |
1b473f29 | 760 | min_t(unsigned int, s->object_size, PAGE_SIZE)); |
81819f0f | 761 | if (s->flags & SLAB_RED_ZONE) |
8669dbab | 762 | print_section(KERN_ERR, "Redzone ", p + s->object_size, |
3b0efdfa | 763 | s->inuse - s->object_size); |
81819f0f | 764 | |
cbfc35a4 | 765 | off = get_info_end(s); |
81819f0f | 766 | |
24922684 | 767 | if (s->flags & SLAB_STORE_USER) |
81819f0f | 768 | off += 2 * sizeof(struct track); |
81819f0f | 769 | |
80a9201a AP |
770 | off += kasan_metadata_size(s); |
771 | ||
d86bd1be | 772 | if (off != size_from_object(s)) |
81819f0f | 773 | /* Beginning of the filler is the free pointer */ |
8669dbab | 774 | print_section(KERN_ERR, "Padding ", p + off, |
aa2efd5e | 775 | size_from_object(s) - off); |
24922684 CL |
776 | |
777 | dump_stack(); | |
81819f0f CL |
778 | } |
779 | ||
75c66def | 780 | void object_err(struct kmem_cache *s, struct page *page, |
81819f0f CL |
781 | u8 *object, char *reason) |
782 | { | |
1f9f78b1 OG |
783 | if (slab_add_kunit_errors()) |
784 | return; | |
785 | ||
3dc50637 | 786 | slab_bug(s, "%s", reason); |
24922684 | 787 | print_trailer(s, page, object); |
65ebdeef | 788 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
81819f0f CL |
789 | } |
790 | ||
a38965bf | 791 | static __printf(3, 4) void slab_err(struct kmem_cache *s, struct page *page, |
d0e0ac97 | 792 | const char *fmt, ...) |
81819f0f CL |
793 | { |
794 | va_list args; | |
795 | char buf[100]; | |
796 | ||
1f9f78b1 OG |
797 | if (slab_add_kunit_errors()) |
798 | return; | |
799 | ||
24922684 CL |
800 | va_start(args, fmt); |
801 | vsnprintf(buf, sizeof(buf), fmt, args); | |
81819f0f | 802 | va_end(args); |
3dc50637 | 803 | slab_bug(s, "%s", buf); |
24922684 | 804 | print_page_info(page); |
81819f0f | 805 | dump_stack(); |
65ebdeef | 806 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
81819f0f CL |
807 | } |
808 | ||
f7cb1933 | 809 | static void init_object(struct kmem_cache *s, void *object, u8 val) |
81819f0f | 810 | { |
aa1ef4d7 | 811 | u8 *p = kasan_reset_tag(object); |
81819f0f | 812 | |
d86bd1be JK |
813 | if (s->flags & SLAB_RED_ZONE) |
814 | memset(p - s->red_left_pad, val, s->red_left_pad); | |
815 | ||
81819f0f | 816 | if (s->flags & __OBJECT_POISON) { |
3b0efdfa CL |
817 | memset(p, POISON_FREE, s->object_size - 1); |
818 | p[s->object_size - 1] = POISON_END; | |
81819f0f CL |
819 | } |
820 | ||
821 | if (s->flags & SLAB_RED_ZONE) | |
3b0efdfa | 822 | memset(p + s->object_size, val, s->inuse - s->object_size); |
81819f0f CL |
823 | } |
824 | ||
24922684 CL |
825 | static void restore_bytes(struct kmem_cache *s, char *message, u8 data, |
826 | void *from, void *to) | |
827 | { | |
582d1212 | 828 | slab_fix(s, "Restoring %s 0x%p-0x%p=0x%x", message, from, to - 1, data); |
24922684 CL |
829 | memset(from, data, to - from); |
830 | } | |
831 | ||
832 | static int check_bytes_and_report(struct kmem_cache *s, struct page *page, | |
833 | u8 *object, char *what, | |
06428780 | 834 | u8 *start, unsigned int value, unsigned int bytes) |
24922684 CL |
835 | { |
836 | u8 *fault; | |
837 | u8 *end; | |
e1b70dd1 | 838 | u8 *addr = page_address(page); |
24922684 | 839 | |
a79316c6 | 840 | metadata_access_enable(); |
aa1ef4d7 | 841 | fault = memchr_inv(kasan_reset_tag(start), value, bytes); |
a79316c6 | 842 | metadata_access_disable(); |
24922684 CL |
843 | if (!fault) |
844 | return 1; | |
845 | ||
846 | end = start + bytes; | |
847 | while (end > fault && end[-1] == value) | |
848 | end--; | |
849 | ||
1f9f78b1 OG |
850 | if (slab_add_kunit_errors()) |
851 | goto skip_bug_print; | |
852 | ||
24922684 | 853 | slab_bug(s, "%s overwritten", what); |
96b94abc | 854 | pr_err("0x%p-0x%p @offset=%tu. First byte 0x%x instead of 0x%x\n", |
e1b70dd1 MC |
855 | fault, end - 1, fault - addr, |
856 | fault[0], value); | |
24922684 | 857 | print_trailer(s, page, object); |
65ebdeef | 858 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
24922684 | 859 | |
1f9f78b1 | 860 | skip_bug_print: |
24922684 CL |
861 | restore_bytes(s, what, value, fault, end); |
862 | return 0; | |
81819f0f CL |
863 | } |
864 | ||
81819f0f CL |
865 | /* |
866 | * Object layout: | |
867 | * | |
868 | * object address | |
869 | * Bytes of the object to be managed. | |
870 | * If the freepointer may overlay the object then the free | |
cbfc35a4 | 871 | * pointer is at the middle of the object. |
672bba3a | 872 | * |
81819f0f CL |
873 | * Poisoning uses 0x6b (POISON_FREE) and the last byte is |
874 | * 0xa5 (POISON_END) | |
875 | * | |
3b0efdfa | 876 | * object + s->object_size |
81819f0f | 877 | * Padding to reach word boundary. This is also used for Redzoning. |
672bba3a | 878 | * Padding is extended by another word if Redzoning is enabled and |
3b0efdfa | 879 | * object_size == inuse. |
672bba3a | 880 | * |
81819f0f CL |
881 | * We fill with 0xbb (RED_INACTIVE) for inactive objects and with |
882 | * 0xcc (RED_ACTIVE) for objects in use. | |
883 | * | |
884 | * object + s->inuse | |
672bba3a CL |
885 | * Meta data starts here. |
886 | * | |
81819f0f CL |
887 | * A. Free pointer (if we cannot overwrite object on free) |
888 | * B. Tracking data for SLAB_STORE_USER | |
dc84207d | 889 | * C. Padding to reach required alignment boundary or at minimum |
6446faa2 | 890 | * one word if debugging is on to be able to detect writes |
672bba3a CL |
891 | * before the word boundary. |
892 | * | |
893 | * Padding is done using 0x5a (POISON_INUSE) | |
81819f0f CL |
894 | * |
895 | * object + s->size | |
672bba3a | 896 | * Nothing is used beyond s->size. |
81819f0f | 897 | * |
3b0efdfa | 898 | * If slabcaches are merged then the object_size and inuse boundaries are mostly |
672bba3a | 899 | * ignored. And therefore no slab options that rely on these boundaries |
81819f0f CL |
900 | * may be used with merged slabcaches. |
901 | */ | |
902 | ||
81819f0f CL |
903 | static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) |
904 | { | |
cbfc35a4 | 905 | unsigned long off = get_info_end(s); /* The end of info */ |
81819f0f CL |
906 | |
907 | if (s->flags & SLAB_STORE_USER) | |
908 | /* We also have user information there */ | |
909 | off += 2 * sizeof(struct track); | |
910 | ||
80a9201a AP |
911 | off += kasan_metadata_size(s); |
912 | ||
d86bd1be | 913 | if (size_from_object(s) == off) |
81819f0f CL |
914 | return 1; |
915 | ||
24922684 | 916 | return check_bytes_and_report(s, page, p, "Object padding", |
d86bd1be | 917 | p + off, POISON_INUSE, size_from_object(s) - off); |
81819f0f CL |
918 | } |
919 | ||
39b26464 | 920 | /* Check the pad bytes at the end of a slab page */ |
81819f0f CL |
921 | static int slab_pad_check(struct kmem_cache *s, struct page *page) |
922 | { | |
24922684 CL |
923 | u8 *start; |
924 | u8 *fault; | |
925 | u8 *end; | |
5d682681 | 926 | u8 *pad; |
24922684 CL |
927 | int length; |
928 | int remainder; | |
81819f0f CL |
929 | |
930 | if (!(s->flags & SLAB_POISON)) | |
931 | return 1; | |
932 | ||
a973e9dd | 933 | start = page_address(page); |
a50b854e | 934 | length = page_size(page); |
39b26464 CL |
935 | end = start + length; |
936 | remainder = length % s->size; | |
81819f0f CL |
937 | if (!remainder) |
938 | return 1; | |
939 | ||
5d682681 | 940 | pad = end - remainder; |
a79316c6 | 941 | metadata_access_enable(); |
aa1ef4d7 | 942 | fault = memchr_inv(kasan_reset_tag(pad), POISON_INUSE, remainder); |
a79316c6 | 943 | metadata_access_disable(); |
24922684 CL |
944 | if (!fault) |
945 | return 1; | |
946 | while (end > fault && end[-1] == POISON_INUSE) | |
947 | end--; | |
948 | ||
e1b70dd1 MC |
949 | slab_err(s, page, "Padding overwritten. 0x%p-0x%p @offset=%tu", |
950 | fault, end - 1, fault - start); | |
5d682681 | 951 | print_section(KERN_ERR, "Padding ", pad, remainder); |
24922684 | 952 | |
5d682681 | 953 | restore_bytes(s, "slab padding", POISON_INUSE, fault, end); |
24922684 | 954 | return 0; |
81819f0f CL |
955 | } |
956 | ||
957 | static int check_object(struct kmem_cache *s, struct page *page, | |
f7cb1933 | 958 | void *object, u8 val) |
81819f0f CL |
959 | { |
960 | u8 *p = object; | |
3b0efdfa | 961 | u8 *endobject = object + s->object_size; |
81819f0f CL |
962 | |
963 | if (s->flags & SLAB_RED_ZONE) { | |
8669dbab | 964 | if (!check_bytes_and_report(s, page, object, "Left Redzone", |
d86bd1be JK |
965 | object - s->red_left_pad, val, s->red_left_pad)) |
966 | return 0; | |
967 | ||
8669dbab | 968 | if (!check_bytes_and_report(s, page, object, "Right Redzone", |
3b0efdfa | 969 | endobject, val, s->inuse - s->object_size)) |
81819f0f | 970 | return 0; |
81819f0f | 971 | } else { |
3b0efdfa | 972 | if ((s->flags & SLAB_POISON) && s->object_size < s->inuse) { |
3adbefee | 973 | check_bytes_and_report(s, page, p, "Alignment padding", |
d0e0ac97 CG |
974 | endobject, POISON_INUSE, |
975 | s->inuse - s->object_size); | |
3adbefee | 976 | } |
81819f0f CL |
977 | } |
978 | ||
979 | if (s->flags & SLAB_POISON) { | |
f7cb1933 | 980 | if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) && |
24922684 | 981 | (!check_bytes_and_report(s, page, p, "Poison", p, |
3b0efdfa | 982 | POISON_FREE, s->object_size - 1) || |
8669dbab | 983 | !check_bytes_and_report(s, page, p, "End Poison", |
3b0efdfa | 984 | p + s->object_size - 1, POISON_END, 1))) |
81819f0f | 985 | return 0; |
81819f0f CL |
986 | /* |
987 | * check_pad_bytes cleans up on its own. | |
988 | */ | |
989 | check_pad_bytes(s, page, p); | |
990 | } | |
991 | ||
cbfc35a4 | 992 | if (!freeptr_outside_object(s) && val == SLUB_RED_ACTIVE) |
81819f0f CL |
993 | /* |
994 | * Object and freepointer overlap. Cannot check | |
995 | * freepointer while object is allocated. | |
996 | */ | |
997 | return 1; | |
998 | ||
999 | /* Check free pointer validity */ | |
1000 | if (!check_valid_pointer(s, page, get_freepointer(s, p))) { | |
1001 | object_err(s, page, p, "Freepointer corrupt"); | |
1002 | /* | |
9f6c708e | 1003 | * No choice but to zap it and thus lose the remainder |
81819f0f | 1004 | * of the free objects in this slab. May cause |
672bba3a | 1005 | * another error because the object count is now wrong. |
81819f0f | 1006 | */ |
a973e9dd | 1007 | set_freepointer(s, p, NULL); |
81819f0f CL |
1008 | return 0; |
1009 | } | |
1010 | return 1; | |
1011 | } | |
1012 | ||
1013 | static int check_slab(struct kmem_cache *s, struct page *page) | |
1014 | { | |
39b26464 CL |
1015 | int maxobj; |
1016 | ||
81819f0f CL |
1017 | VM_BUG_ON(!irqs_disabled()); |
1018 | ||
1019 | if (!PageSlab(page)) { | |
24922684 | 1020 | slab_err(s, page, "Not a valid slab page"); |
81819f0f CL |
1021 | return 0; |
1022 | } | |
39b26464 | 1023 | |
9736d2a9 | 1024 | maxobj = order_objects(compound_order(page), s->size); |
39b26464 CL |
1025 | if (page->objects > maxobj) { |
1026 | slab_err(s, page, "objects %u > max %u", | |
f6edde9c | 1027 | page->objects, maxobj); |
39b26464 CL |
1028 | return 0; |
1029 | } | |
1030 | if (page->inuse > page->objects) { | |
24922684 | 1031 | slab_err(s, page, "inuse %u > max %u", |
f6edde9c | 1032 | page->inuse, page->objects); |
81819f0f CL |
1033 | return 0; |
1034 | } | |
1035 | /* Slab_pad_check fixes things up after itself */ | |
1036 | slab_pad_check(s, page); | |
1037 | return 1; | |
1038 | } | |
1039 | ||
1040 | /* | |
672bba3a CL |
1041 | * Determine if a certain object on a page is on the freelist. Must hold the |
1042 | * slab lock to guarantee that the chains are in a consistent state. | |
81819f0f CL |
1043 | */ |
1044 | static int on_freelist(struct kmem_cache *s, struct page *page, void *search) | |
1045 | { | |
1046 | int nr = 0; | |
881db7fb | 1047 | void *fp; |
81819f0f | 1048 | void *object = NULL; |
f6edde9c | 1049 | int max_objects; |
81819f0f | 1050 | |
881db7fb | 1051 | fp = page->freelist; |
39b26464 | 1052 | while (fp && nr <= page->objects) { |
81819f0f CL |
1053 | if (fp == search) |
1054 | return 1; | |
1055 | if (!check_valid_pointer(s, page, fp)) { | |
1056 | if (object) { | |
1057 | object_err(s, page, object, | |
1058 | "Freechain corrupt"); | |
a973e9dd | 1059 | set_freepointer(s, object, NULL); |
81819f0f | 1060 | } else { |
24922684 | 1061 | slab_err(s, page, "Freepointer corrupt"); |
a973e9dd | 1062 | page->freelist = NULL; |
39b26464 | 1063 | page->inuse = page->objects; |
24922684 | 1064 | slab_fix(s, "Freelist cleared"); |
81819f0f CL |
1065 | return 0; |
1066 | } | |
1067 | break; | |
1068 | } | |
1069 | object = fp; | |
1070 | fp = get_freepointer(s, object); | |
1071 | nr++; | |
1072 | } | |
1073 | ||
9736d2a9 | 1074 | max_objects = order_objects(compound_order(page), s->size); |
210b5c06 CG |
1075 | if (max_objects > MAX_OBJS_PER_PAGE) |
1076 | max_objects = MAX_OBJS_PER_PAGE; | |
224a88be CL |
1077 | |
1078 | if (page->objects != max_objects) { | |
756a025f JP |
1079 | slab_err(s, page, "Wrong number of objects. Found %d but should be %d", |
1080 | page->objects, max_objects); | |
224a88be | 1081 | page->objects = max_objects; |
582d1212 | 1082 | slab_fix(s, "Number of objects adjusted"); |
224a88be | 1083 | } |
39b26464 | 1084 | if (page->inuse != page->objects - nr) { |
756a025f JP |
1085 | slab_err(s, page, "Wrong object count. Counter is %d but counted were %d", |
1086 | page->inuse, page->objects - nr); | |
39b26464 | 1087 | page->inuse = page->objects - nr; |
582d1212 | 1088 | slab_fix(s, "Object count adjusted"); |
81819f0f CL |
1089 | } |
1090 | return search == NULL; | |
1091 | } | |
1092 | ||
0121c619 CL |
1093 | static void trace(struct kmem_cache *s, struct page *page, void *object, |
1094 | int alloc) | |
3ec09742 CL |
1095 | { |
1096 | if (s->flags & SLAB_TRACE) { | |
f9f58285 | 1097 | pr_info("TRACE %s %s 0x%p inuse=%d fp=0x%p\n", |
3ec09742 CL |
1098 | s->name, |
1099 | alloc ? "alloc" : "free", | |
1100 | object, page->inuse, | |
1101 | page->freelist); | |
1102 | ||
1103 | if (!alloc) | |
aa2efd5e | 1104 | print_section(KERN_INFO, "Object ", (void *)object, |
d0e0ac97 | 1105 | s->object_size); |
3ec09742 CL |
1106 | |
1107 | dump_stack(); | |
1108 | } | |
1109 | } | |
1110 | ||
643b1138 | 1111 | /* |
672bba3a | 1112 | * Tracking of fully allocated slabs for debugging purposes. |
643b1138 | 1113 | */ |
5cc6eee8 CL |
1114 | static void add_full(struct kmem_cache *s, |
1115 | struct kmem_cache_node *n, struct page *page) | |
643b1138 | 1116 | { |
5cc6eee8 CL |
1117 | if (!(s->flags & SLAB_STORE_USER)) |
1118 | return; | |
1119 | ||
255d0884 | 1120 | lockdep_assert_held(&n->list_lock); |
916ac052 | 1121 | list_add(&page->slab_list, &n->full); |
643b1138 CL |
1122 | } |
1123 | ||
c65c1877 | 1124 | static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page) |
643b1138 | 1125 | { |
643b1138 CL |
1126 | if (!(s->flags & SLAB_STORE_USER)) |
1127 | return; | |
1128 | ||
255d0884 | 1129 | lockdep_assert_held(&n->list_lock); |
916ac052 | 1130 | list_del(&page->slab_list); |
643b1138 CL |
1131 | } |
1132 | ||
0f389ec6 CL |
1133 | /* Tracking of the number of slabs for debugging purposes */ |
1134 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) | |
1135 | { | |
1136 | struct kmem_cache_node *n = get_node(s, node); | |
1137 | ||
1138 | return atomic_long_read(&n->nr_slabs); | |
1139 | } | |
1140 | ||
26c02cf0 AB |
1141 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
1142 | { | |
1143 | return atomic_long_read(&n->nr_slabs); | |
1144 | } | |
1145 | ||
205ab99d | 1146 | static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects) |
0f389ec6 CL |
1147 | { |
1148 | struct kmem_cache_node *n = get_node(s, node); | |
1149 | ||
1150 | /* | |
1151 | * May be called early in order to allocate a slab for the | |
1152 | * kmem_cache_node structure. Solve the chicken-egg | |
1153 | * dilemma by deferring the increment of the count during | |
1154 | * bootstrap (see early_kmem_cache_node_alloc). | |
1155 | */ | |
338b2642 | 1156 | if (likely(n)) { |
0f389ec6 | 1157 | atomic_long_inc(&n->nr_slabs); |
205ab99d CL |
1158 | atomic_long_add(objects, &n->total_objects); |
1159 | } | |
0f389ec6 | 1160 | } |
205ab99d | 1161 | static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects) |
0f389ec6 CL |
1162 | { |
1163 | struct kmem_cache_node *n = get_node(s, node); | |
1164 | ||
1165 | atomic_long_dec(&n->nr_slabs); | |
205ab99d | 1166 | atomic_long_sub(objects, &n->total_objects); |
0f389ec6 CL |
1167 | } |
1168 | ||
1169 | /* Object debug checks for alloc/free paths */ | |
3ec09742 CL |
1170 | static void setup_object_debug(struct kmem_cache *s, struct page *page, |
1171 | void *object) | |
1172 | { | |
8fc8d666 | 1173 | if (!kmem_cache_debug_flags(s, SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON)) |
3ec09742 CL |
1174 | return; |
1175 | ||
f7cb1933 | 1176 | init_object(s, object, SLUB_RED_INACTIVE); |
3ec09742 CL |
1177 | init_tracking(s, object); |
1178 | } | |
1179 | ||
a50b854e MWO |
1180 | static |
1181 | void setup_page_debug(struct kmem_cache *s, struct page *page, void *addr) | |
a7101224 | 1182 | { |
8fc8d666 | 1183 | if (!kmem_cache_debug_flags(s, SLAB_POISON)) |
a7101224 AK |
1184 | return; |
1185 | ||
1186 | metadata_access_enable(); | |
aa1ef4d7 | 1187 | memset(kasan_reset_tag(addr), POISON_INUSE, page_size(page)); |
a7101224 AK |
1188 | metadata_access_disable(); |
1189 | } | |
1190 | ||
becfda68 | 1191 | static inline int alloc_consistency_checks(struct kmem_cache *s, |
278d7756 | 1192 | struct page *page, void *object) |
81819f0f CL |
1193 | { |
1194 | if (!check_slab(s, page)) | |
becfda68 | 1195 | return 0; |
81819f0f | 1196 | |
81819f0f CL |
1197 | if (!check_valid_pointer(s, page, object)) { |
1198 | object_err(s, page, object, "Freelist Pointer check fails"); | |
becfda68 | 1199 | return 0; |
81819f0f CL |
1200 | } |
1201 | ||
f7cb1933 | 1202 | if (!check_object(s, page, object, SLUB_RED_INACTIVE)) |
becfda68 LA |
1203 | return 0; |
1204 | ||
1205 | return 1; | |
1206 | } | |
1207 | ||
1208 | static noinline int alloc_debug_processing(struct kmem_cache *s, | |
1209 | struct page *page, | |
1210 | void *object, unsigned long addr) | |
1211 | { | |
1212 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { | |
278d7756 | 1213 | if (!alloc_consistency_checks(s, page, object)) |
becfda68 LA |
1214 | goto bad; |
1215 | } | |
81819f0f | 1216 | |
3ec09742 CL |
1217 | /* Success perform special debug activities for allocs */ |
1218 | if (s->flags & SLAB_STORE_USER) | |
1219 | set_track(s, object, TRACK_ALLOC, addr); | |
1220 | trace(s, page, object, 1); | |
f7cb1933 | 1221 | init_object(s, object, SLUB_RED_ACTIVE); |
81819f0f | 1222 | return 1; |
3ec09742 | 1223 | |
81819f0f CL |
1224 | bad: |
1225 | if (PageSlab(page)) { | |
1226 | /* | |
1227 | * If this is a slab page then lets do the best we can | |
1228 | * to avoid issues in the future. Marking all objects | |
672bba3a | 1229 | * as used avoids touching the remaining objects. |
81819f0f | 1230 | */ |
24922684 | 1231 | slab_fix(s, "Marking all objects used"); |
39b26464 | 1232 | page->inuse = page->objects; |
a973e9dd | 1233 | page->freelist = NULL; |
81819f0f CL |
1234 | } |
1235 | return 0; | |
1236 | } | |
1237 | ||
becfda68 LA |
1238 | static inline int free_consistency_checks(struct kmem_cache *s, |
1239 | struct page *page, void *object, unsigned long addr) | |
81819f0f | 1240 | { |
81819f0f | 1241 | if (!check_valid_pointer(s, page, object)) { |
70d71228 | 1242 | slab_err(s, page, "Invalid object pointer 0x%p", object); |
becfda68 | 1243 | return 0; |
81819f0f CL |
1244 | } |
1245 | ||
1246 | if (on_freelist(s, page, object)) { | |
24922684 | 1247 | object_err(s, page, object, "Object already free"); |
becfda68 | 1248 | return 0; |
81819f0f CL |
1249 | } |
1250 | ||
f7cb1933 | 1251 | if (!check_object(s, page, object, SLUB_RED_ACTIVE)) |
becfda68 | 1252 | return 0; |
81819f0f | 1253 | |
1b4f59e3 | 1254 | if (unlikely(s != page->slab_cache)) { |
3adbefee | 1255 | if (!PageSlab(page)) { |
756a025f JP |
1256 | slab_err(s, page, "Attempt to free object(0x%p) outside of slab", |
1257 | object); | |
1b4f59e3 | 1258 | } else if (!page->slab_cache) { |
f9f58285 FF |
1259 | pr_err("SLUB <none>: no slab for object 0x%p.\n", |
1260 | object); | |
70d71228 | 1261 | dump_stack(); |
06428780 | 1262 | } else |
24922684 CL |
1263 | object_err(s, page, object, |
1264 | "page slab pointer corrupt."); | |
becfda68 LA |
1265 | return 0; |
1266 | } | |
1267 | return 1; | |
1268 | } | |
1269 | ||
1270 | /* Supports checking bulk free of a constructed freelist */ | |
1271 | static noinline int free_debug_processing( | |
1272 | struct kmem_cache *s, struct page *page, | |
1273 | void *head, void *tail, int bulk_cnt, | |
1274 | unsigned long addr) | |
1275 | { | |
1276 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); | |
1277 | void *object = head; | |
1278 | int cnt = 0; | |
3f649ab7 | 1279 | unsigned long flags; |
becfda68 LA |
1280 | int ret = 0; |
1281 | ||
1282 | spin_lock_irqsave(&n->list_lock, flags); | |
1283 | slab_lock(page); | |
1284 | ||
1285 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { | |
1286 | if (!check_slab(s, page)) | |
1287 | goto out; | |
1288 | } | |
1289 | ||
1290 | next_object: | |
1291 | cnt++; | |
1292 | ||
1293 | if (s->flags & SLAB_CONSISTENCY_CHECKS) { | |
1294 | if (!free_consistency_checks(s, page, object, addr)) | |
1295 | goto out; | |
81819f0f | 1296 | } |
3ec09742 | 1297 | |
3ec09742 CL |
1298 | if (s->flags & SLAB_STORE_USER) |
1299 | set_track(s, object, TRACK_FREE, addr); | |
1300 | trace(s, page, object, 0); | |
81084651 | 1301 | /* Freepointer not overwritten by init_object(), SLAB_POISON moved it */ |
f7cb1933 | 1302 | init_object(s, object, SLUB_RED_INACTIVE); |
81084651 JDB |
1303 | |
1304 | /* Reached end of constructed freelist yet? */ | |
1305 | if (object != tail) { | |
1306 | object = get_freepointer(s, object); | |
1307 | goto next_object; | |
1308 | } | |
804aa132 LA |
1309 | ret = 1; |
1310 | ||
5c2e4bbb | 1311 | out: |
81084651 JDB |
1312 | if (cnt != bulk_cnt) |
1313 | slab_err(s, page, "Bulk freelist count(%d) invalid(%d)\n", | |
1314 | bulk_cnt, cnt); | |
1315 | ||
881db7fb | 1316 | slab_unlock(page); |
282acb43 | 1317 | spin_unlock_irqrestore(&n->list_lock, flags); |
804aa132 LA |
1318 | if (!ret) |
1319 | slab_fix(s, "Object at 0x%p not freed", object); | |
1320 | return ret; | |
81819f0f CL |
1321 | } |
1322 | ||
e17f1dfb VB |
1323 | /* |
1324 | * Parse a block of slub_debug options. Blocks are delimited by ';' | |
1325 | * | |
1326 | * @str: start of block | |
1327 | * @flags: returns parsed flags, or DEBUG_DEFAULT_FLAGS if none specified | |
1328 | * @slabs: return start of list of slabs, or NULL when there's no list | |
1329 | * @init: assume this is initial parsing and not per-kmem-create parsing | |
1330 | * | |
1331 | * returns the start of next block if there's any, or NULL | |
1332 | */ | |
1333 | static char * | |
1334 | parse_slub_debug_flags(char *str, slab_flags_t *flags, char **slabs, bool init) | |
41ecc55b | 1335 | { |
e17f1dfb | 1336 | bool higher_order_disable = false; |
f0630fff | 1337 | |
e17f1dfb VB |
1338 | /* Skip any completely empty blocks */ |
1339 | while (*str && *str == ';') | |
1340 | str++; | |
1341 | ||
1342 | if (*str == ',') { | |
f0630fff CL |
1343 | /* |
1344 | * No options but restriction on slabs. This means full | |
1345 | * debugging for slabs matching a pattern. | |
1346 | */ | |
e17f1dfb | 1347 | *flags = DEBUG_DEFAULT_FLAGS; |
f0630fff | 1348 | goto check_slabs; |
e17f1dfb VB |
1349 | } |
1350 | *flags = 0; | |
f0630fff | 1351 | |
e17f1dfb VB |
1352 | /* Determine which debug features should be switched on */ |
1353 | for (; *str && *str != ',' && *str != ';'; str++) { | |
f0630fff | 1354 | switch (tolower(*str)) { |
e17f1dfb VB |
1355 | case '-': |
1356 | *flags = 0; | |
1357 | break; | |
f0630fff | 1358 | case 'f': |
e17f1dfb | 1359 | *flags |= SLAB_CONSISTENCY_CHECKS; |
f0630fff CL |
1360 | break; |
1361 | case 'z': | |
e17f1dfb | 1362 | *flags |= SLAB_RED_ZONE; |
f0630fff CL |
1363 | break; |
1364 | case 'p': | |
e17f1dfb | 1365 | *flags |= SLAB_POISON; |
f0630fff CL |
1366 | break; |
1367 | case 'u': | |
e17f1dfb | 1368 | *flags |= SLAB_STORE_USER; |
f0630fff CL |
1369 | break; |
1370 | case 't': | |
e17f1dfb | 1371 | *flags |= SLAB_TRACE; |
f0630fff | 1372 | break; |
4c13dd3b | 1373 | case 'a': |
e17f1dfb | 1374 | *flags |= SLAB_FAILSLAB; |
4c13dd3b | 1375 | break; |
08303a73 CA |
1376 | case 'o': |
1377 | /* | |
1378 | * Avoid enabling debugging on caches if its minimum | |
1379 | * order would increase as a result. | |
1380 | */ | |
e17f1dfb | 1381 | higher_order_disable = true; |
08303a73 | 1382 | break; |
f0630fff | 1383 | default: |
e17f1dfb VB |
1384 | if (init) |
1385 | pr_err("slub_debug option '%c' unknown. skipped\n", *str); | |
f0630fff | 1386 | } |
41ecc55b | 1387 | } |
f0630fff | 1388 | check_slabs: |
41ecc55b | 1389 | if (*str == ',') |
e17f1dfb VB |
1390 | *slabs = ++str; |
1391 | else | |
1392 | *slabs = NULL; | |
1393 | ||
1394 | /* Skip over the slab list */ | |
1395 | while (*str && *str != ';') | |
1396 | str++; | |
1397 | ||
1398 | /* Skip any completely empty blocks */ | |
1399 | while (*str && *str == ';') | |
1400 | str++; | |
1401 | ||
1402 | if (init && higher_order_disable) | |
1403 | disable_higher_order_debug = 1; | |
1404 | ||
1405 | if (*str) | |
1406 | return str; | |
1407 | else | |
1408 | return NULL; | |
1409 | } | |
1410 | ||
1411 | static int __init setup_slub_debug(char *str) | |
1412 | { | |
1413 | slab_flags_t flags; | |
1414 | char *saved_str; | |
1415 | char *slab_list; | |
1416 | bool global_slub_debug_changed = false; | |
1417 | bool slab_list_specified = false; | |
1418 | ||
1419 | slub_debug = DEBUG_DEFAULT_FLAGS; | |
1420 | if (*str++ != '=' || !*str) | |
1421 | /* | |
1422 | * No options specified. Switch on full debugging. | |
1423 | */ | |
1424 | goto out; | |
1425 | ||
1426 | saved_str = str; | |
1427 | while (str) { | |
1428 | str = parse_slub_debug_flags(str, &flags, &slab_list, true); | |
1429 | ||
1430 | if (!slab_list) { | |
1431 | slub_debug = flags; | |
1432 | global_slub_debug_changed = true; | |
1433 | } else { | |
1434 | slab_list_specified = true; | |
1435 | } | |
1436 | } | |
1437 | ||
1438 | /* | |
1439 | * For backwards compatibility, a single list of flags with list of | |
1440 | * slabs means debugging is only enabled for those slabs, so the global | |
1441 | * slub_debug should be 0. We can extended that to multiple lists as | |
1442 | * long as there is no option specifying flags without a slab list. | |
1443 | */ | |
1444 | if (slab_list_specified) { | |
1445 | if (!global_slub_debug_changed) | |
1446 | slub_debug = 0; | |
1447 | slub_debug_string = saved_str; | |
1448 | } | |
f0630fff | 1449 | out: |
ca0cab65 VB |
1450 | if (slub_debug != 0 || slub_debug_string) |
1451 | static_branch_enable(&slub_debug_enabled); | |
02ac47d0 SB |
1452 | else |
1453 | static_branch_disable(&slub_debug_enabled); | |
6471384a AP |
1454 | if ((static_branch_unlikely(&init_on_alloc) || |
1455 | static_branch_unlikely(&init_on_free)) && | |
1456 | (slub_debug & SLAB_POISON)) | |
1457 | pr_info("mem auto-init: SLAB_POISON will take precedence over init_on_alloc/init_on_free\n"); | |
41ecc55b CL |
1458 | return 1; |
1459 | } | |
1460 | ||
1461 | __setup("slub_debug", setup_slub_debug); | |
1462 | ||
c5fd3ca0 AT |
1463 | /* |
1464 | * kmem_cache_flags - apply debugging options to the cache | |
1465 | * @object_size: the size of an object without meta data | |
1466 | * @flags: flags to set | |
1467 | * @name: name of the cache | |
c5fd3ca0 AT |
1468 | * |
1469 | * Debug option(s) are applied to @flags. In addition to the debug | |
1470 | * option(s), if a slab name (or multiple) is specified i.e. | |
1471 | * slub_debug=<Debug-Options>,<slab name1>,<slab name2> ... | |
1472 | * then only the select slabs will receive the debug option(s). | |
1473 | */ | |
0293d1fd | 1474 | slab_flags_t kmem_cache_flags(unsigned int object_size, |
37540008 | 1475 | slab_flags_t flags, const char *name) |
41ecc55b | 1476 | { |
c5fd3ca0 AT |
1477 | char *iter; |
1478 | size_t len; | |
e17f1dfb VB |
1479 | char *next_block; |
1480 | slab_flags_t block_flags; | |
ca220593 JB |
1481 | slab_flags_t slub_debug_local = slub_debug; |
1482 | ||
1483 | /* | |
1484 | * If the slab cache is for debugging (e.g. kmemleak) then | |
1485 | * don't store user (stack trace) information by default, | |
1486 | * but let the user enable it via the command line below. | |
1487 | */ | |
1488 | if (flags & SLAB_NOLEAKTRACE) | |
1489 | slub_debug_local &= ~SLAB_STORE_USER; | |
c5fd3ca0 | 1490 | |
c5fd3ca0 | 1491 | len = strlen(name); |
e17f1dfb VB |
1492 | next_block = slub_debug_string; |
1493 | /* Go through all blocks of debug options, see if any matches our slab's name */ | |
1494 | while (next_block) { | |
1495 | next_block = parse_slub_debug_flags(next_block, &block_flags, &iter, false); | |
1496 | if (!iter) | |
1497 | continue; | |
1498 | /* Found a block that has a slab list, search it */ | |
1499 | while (*iter) { | |
1500 | char *end, *glob; | |
1501 | size_t cmplen; | |
1502 | ||
1503 | end = strchrnul(iter, ','); | |
1504 | if (next_block && next_block < end) | |
1505 | end = next_block - 1; | |
1506 | ||
1507 | glob = strnchr(iter, end - iter, '*'); | |
1508 | if (glob) | |
1509 | cmplen = glob - iter; | |
1510 | else | |
1511 | cmplen = max_t(size_t, len, (end - iter)); | |
c5fd3ca0 | 1512 | |
e17f1dfb VB |
1513 | if (!strncmp(name, iter, cmplen)) { |
1514 | flags |= block_flags; | |
1515 | return flags; | |
1516 | } | |
c5fd3ca0 | 1517 | |
e17f1dfb VB |
1518 | if (!*end || *end == ';') |
1519 | break; | |
1520 | iter = end + 1; | |
c5fd3ca0 | 1521 | } |
c5fd3ca0 | 1522 | } |
ba0268a8 | 1523 | |
ca220593 | 1524 | return flags | slub_debug_local; |
41ecc55b | 1525 | } |
b4a64718 | 1526 | #else /* !CONFIG_SLUB_DEBUG */ |
3ec09742 CL |
1527 | static inline void setup_object_debug(struct kmem_cache *s, |
1528 | struct page *page, void *object) {} | |
a50b854e MWO |
1529 | static inline |
1530 | void setup_page_debug(struct kmem_cache *s, struct page *page, void *addr) {} | |
41ecc55b | 1531 | |
3ec09742 | 1532 | static inline int alloc_debug_processing(struct kmem_cache *s, |
ce71e27c | 1533 | struct page *page, void *object, unsigned long addr) { return 0; } |
41ecc55b | 1534 | |
282acb43 | 1535 | static inline int free_debug_processing( |
81084651 JDB |
1536 | struct kmem_cache *s, struct page *page, |
1537 | void *head, void *tail, int bulk_cnt, | |
282acb43 | 1538 | unsigned long addr) { return 0; } |
41ecc55b | 1539 | |
41ecc55b CL |
1540 | static inline int slab_pad_check(struct kmem_cache *s, struct page *page) |
1541 | { return 1; } | |
1542 | static inline int check_object(struct kmem_cache *s, struct page *page, | |
f7cb1933 | 1543 | void *object, u8 val) { return 1; } |
5cc6eee8 CL |
1544 | static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, |
1545 | struct page *page) {} | |
c65c1877 PZ |
1546 | static inline void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, |
1547 | struct page *page) {} | |
0293d1fd | 1548 | slab_flags_t kmem_cache_flags(unsigned int object_size, |
37540008 | 1549 | slab_flags_t flags, const char *name) |
ba0268a8 CL |
1550 | { |
1551 | return flags; | |
1552 | } | |
41ecc55b | 1553 | #define slub_debug 0 |
0f389ec6 | 1554 | |
fdaa45e9 IM |
1555 | #define disable_higher_order_debug 0 |
1556 | ||
0f389ec6 CL |
1557 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
1558 | { return 0; } | |
26c02cf0 AB |
1559 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
1560 | { return 0; } | |
205ab99d CL |
1561 | static inline void inc_slabs_node(struct kmem_cache *s, int node, |
1562 | int objects) {} | |
1563 | static inline void dec_slabs_node(struct kmem_cache *s, int node, | |
1564 | int objects) {} | |
7d550c56 | 1565 | |
52f23478 | 1566 | static bool freelist_corrupted(struct kmem_cache *s, struct page *page, |
dc07a728 | 1567 | void **freelist, void *nextfree) |
52f23478 DZ |
1568 | { |
1569 | return false; | |
1570 | } | |
02e72cc6 AR |
1571 | #endif /* CONFIG_SLUB_DEBUG */ |
1572 | ||
1573 | /* | |
1574 | * Hooks for other subsystems that check memory allocations. In a typical | |
1575 | * production configuration these hooks all should produce no code at all. | |
1576 | */ | |
0116523c | 1577 | static inline void *kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) |
d56791b3 | 1578 | { |
53128245 | 1579 | ptr = kasan_kmalloc_large(ptr, size, flags); |
a2f77575 | 1580 | /* As ptr might get tagged, call kmemleak hook after KASAN. */ |
d56791b3 | 1581 | kmemleak_alloc(ptr, size, 1, flags); |
53128245 | 1582 | return ptr; |
d56791b3 RB |
1583 | } |
1584 | ||
ee3ce779 | 1585 | static __always_inline void kfree_hook(void *x) |
d56791b3 RB |
1586 | { |
1587 | kmemleak_free(x); | |
027b37b5 | 1588 | kasan_kfree_large(x); |
d56791b3 RB |
1589 | } |
1590 | ||
d57a964e AK |
1591 | static __always_inline bool slab_free_hook(struct kmem_cache *s, |
1592 | void *x, bool init) | |
d56791b3 RB |
1593 | { |
1594 | kmemleak_free_recursive(x, s->flags); | |
7d550c56 | 1595 | |
02e72cc6 AR |
1596 | /* |
1597 | * Trouble is that we may no longer disable interrupts in the fast path | |
1598 | * So in order to make the debug calls that expect irqs to be | |
1599 | * disabled we need to disable interrupts temporarily. | |
1600 | */ | |
4675ff05 | 1601 | #ifdef CONFIG_LOCKDEP |
02e72cc6 AR |
1602 | { |
1603 | unsigned long flags; | |
1604 | ||
1605 | local_irq_save(flags); | |
02e72cc6 AR |
1606 | debug_check_no_locks_freed(x, s->object_size); |
1607 | local_irq_restore(flags); | |
1608 | } | |
1609 | #endif | |
1610 | if (!(s->flags & SLAB_DEBUG_OBJECTS)) | |
1611 | debug_check_no_obj_freed(x, s->object_size); | |
0316bec2 | 1612 | |
cfbe1636 ME |
1613 | /* Use KCSAN to help debug racy use-after-free. */ |
1614 | if (!(s->flags & SLAB_TYPESAFE_BY_RCU)) | |
1615 | __kcsan_check_access(x, s->object_size, | |
1616 | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ASSERT); | |
1617 | ||
d57a964e AK |
1618 | /* |
1619 | * As memory initialization might be integrated into KASAN, | |
1620 | * kasan_slab_free and initialization memset's must be | |
1621 | * kept together to avoid discrepancies in behavior. | |
1622 | * | |
1623 | * The initialization memset's clear the object and the metadata, | |
1624 | * but don't touch the SLAB redzone. | |
1625 | */ | |
1626 | if (init) { | |
1627 | int rsize; | |
1628 | ||
1629 | if (!kasan_has_integrated_init()) | |
1630 | memset(kasan_reset_tag(x), 0, s->object_size); | |
1631 | rsize = (s->flags & SLAB_RED_ZONE) ? s->red_left_pad : 0; | |
1632 | memset((char *)kasan_reset_tag(x) + s->inuse, 0, | |
1633 | s->size - s->inuse - rsize); | |
1634 | } | |
1635 | /* KASAN might put x into memory quarantine, delaying its reuse. */ | |
1636 | return kasan_slab_free(s, x, init); | |
02e72cc6 | 1637 | } |
205ab99d | 1638 | |
c3895391 AK |
1639 | static inline bool slab_free_freelist_hook(struct kmem_cache *s, |
1640 | void **head, void **tail) | |
81084651 | 1641 | { |
6471384a AP |
1642 | |
1643 | void *object; | |
1644 | void *next = *head; | |
1645 | void *old_tail = *tail ? *tail : *head; | |
6471384a | 1646 | |
b89fb5ef | 1647 | if (is_kfence_address(next)) { |
d57a964e | 1648 | slab_free_hook(s, next, false); |
b89fb5ef AP |
1649 | return true; |
1650 | } | |
1651 | ||
aea4df4c LA |
1652 | /* Head and tail of the reconstructed freelist */ |
1653 | *head = NULL; | |
1654 | *tail = NULL; | |
1b7e816f | 1655 | |
aea4df4c LA |
1656 | do { |
1657 | object = next; | |
1658 | next = get_freepointer(s, object); | |
1659 | ||
c3895391 | 1660 | /* If object's reuse doesn't have to be delayed */ |
d57a964e | 1661 | if (!slab_free_hook(s, object, slab_want_init_on_free(s))) { |
c3895391 AK |
1662 | /* Move object to the new freelist */ |
1663 | set_freepointer(s, object, *head); | |
1664 | *head = object; | |
1665 | if (!*tail) | |
1666 | *tail = object; | |
1667 | } | |
1668 | } while (object != old_tail); | |
1669 | ||
1670 | if (*head == *tail) | |
1671 | *tail = NULL; | |
1672 | ||
1673 | return *head != NULL; | |
81084651 JDB |
1674 | } |
1675 | ||
4d176711 | 1676 | static void *setup_object(struct kmem_cache *s, struct page *page, |
588f8ba9 TG |
1677 | void *object) |
1678 | { | |
1679 | setup_object_debug(s, page, object); | |
4d176711 | 1680 | object = kasan_init_slab_obj(s, object); |
588f8ba9 TG |
1681 | if (unlikely(s->ctor)) { |
1682 | kasan_unpoison_object_data(s, object); | |
1683 | s->ctor(object); | |
1684 | kasan_poison_object_data(s, object); | |
1685 | } | |
4d176711 | 1686 | return object; |
588f8ba9 TG |
1687 | } |
1688 | ||
81819f0f CL |
1689 | /* |
1690 | * Slab allocation and freeing | |
1691 | */ | |
5dfb4175 VD |
1692 | static inline struct page *alloc_slab_page(struct kmem_cache *s, |
1693 | gfp_t flags, int node, struct kmem_cache_order_objects oo) | |
65c3376a | 1694 | { |
5dfb4175 | 1695 | struct page *page; |
19af27af | 1696 | unsigned int order = oo_order(oo); |
65c3376a | 1697 | |
2154a336 | 1698 | if (node == NUMA_NO_NODE) |
5dfb4175 | 1699 | page = alloc_pages(flags, order); |
65c3376a | 1700 | else |
96db800f | 1701 | page = __alloc_pages_node(node, flags, order); |
5dfb4175 | 1702 | |
5dfb4175 | 1703 | return page; |
65c3376a CL |
1704 | } |
1705 | ||
210e7a43 TG |
1706 | #ifdef CONFIG_SLAB_FREELIST_RANDOM |
1707 | /* Pre-initialize the random sequence cache */ | |
1708 | static int init_cache_random_seq(struct kmem_cache *s) | |
1709 | { | |
19af27af | 1710 | unsigned int count = oo_objects(s->oo); |
210e7a43 | 1711 | int err; |
210e7a43 | 1712 | |
a810007a SR |
1713 | /* Bailout if already initialised */ |
1714 | if (s->random_seq) | |
1715 | return 0; | |
1716 | ||
210e7a43 TG |
1717 | err = cache_random_seq_create(s, count, GFP_KERNEL); |
1718 | if (err) { | |
1719 | pr_err("SLUB: Unable to initialize free list for %s\n", | |
1720 | s->name); | |
1721 | return err; | |
1722 | } | |
1723 | ||
1724 | /* Transform to an offset on the set of pages */ | |
1725 | if (s->random_seq) { | |
19af27af AD |
1726 | unsigned int i; |
1727 | ||
210e7a43 TG |
1728 | for (i = 0; i < count; i++) |
1729 | s->random_seq[i] *= s->size; | |
1730 | } | |
1731 | return 0; | |
1732 | } | |
1733 | ||
1734 | /* Initialize each random sequence freelist per cache */ | |
1735 | static void __init init_freelist_randomization(void) | |
1736 | { | |
1737 | struct kmem_cache *s; | |
1738 | ||
1739 | mutex_lock(&slab_mutex); | |
1740 | ||
1741 | list_for_each_entry(s, &slab_caches, list) | |
1742 | init_cache_random_seq(s); | |
1743 | ||
1744 | mutex_unlock(&slab_mutex); | |
1745 | } | |
1746 | ||
1747 | /* Get the next entry on the pre-computed freelist randomized */ | |
1748 | static void *next_freelist_entry(struct kmem_cache *s, struct page *page, | |
1749 | unsigned long *pos, void *start, | |
1750 | unsigned long page_limit, | |
1751 | unsigned long freelist_count) | |
1752 | { | |
1753 | unsigned int idx; | |
1754 | ||
1755 | /* | |
1756 | * If the target page allocation failed, the number of objects on the | |
1757 | * page might be smaller than the usual size defined by the cache. | |
1758 | */ | |
1759 | do { | |
1760 | idx = s->random_seq[*pos]; | |
1761 | *pos += 1; | |
1762 | if (*pos >= freelist_count) | |
1763 | *pos = 0; | |
1764 | } while (unlikely(idx >= page_limit)); | |
1765 | ||
1766 | return (char *)start + idx; | |
1767 | } | |
1768 | ||
1769 | /* Shuffle the single linked freelist based on a random pre-computed sequence */ | |
1770 | static bool shuffle_freelist(struct kmem_cache *s, struct page *page) | |
1771 | { | |
1772 | void *start; | |
1773 | void *cur; | |
1774 | void *next; | |
1775 | unsigned long idx, pos, page_limit, freelist_count; | |
1776 | ||
1777 | if (page->objects < 2 || !s->random_seq) | |
1778 | return false; | |
1779 | ||
1780 | freelist_count = oo_objects(s->oo); | |
1781 | pos = get_random_int() % freelist_count; | |
1782 | ||
1783 | page_limit = page->objects * s->size; | |
1784 | start = fixup_red_left(s, page_address(page)); | |
1785 | ||
1786 | /* First entry is used as the base of the freelist */ | |
1787 | cur = next_freelist_entry(s, page, &pos, start, page_limit, | |
1788 | freelist_count); | |
4d176711 | 1789 | cur = setup_object(s, page, cur); |
210e7a43 TG |
1790 | page->freelist = cur; |
1791 | ||
1792 | for (idx = 1; idx < page->objects; idx++) { | |
210e7a43 TG |
1793 | next = next_freelist_entry(s, page, &pos, start, page_limit, |
1794 | freelist_count); | |
4d176711 | 1795 | next = setup_object(s, page, next); |
210e7a43 TG |
1796 | set_freepointer(s, cur, next); |
1797 | cur = next; | |
1798 | } | |
210e7a43 TG |
1799 | set_freepointer(s, cur, NULL); |
1800 | ||
1801 | return true; | |
1802 | } | |
1803 | #else | |
1804 | static inline int init_cache_random_seq(struct kmem_cache *s) | |
1805 | { | |
1806 | return 0; | |
1807 | } | |
1808 | static inline void init_freelist_randomization(void) { } | |
1809 | static inline bool shuffle_freelist(struct kmem_cache *s, struct page *page) | |
1810 | { | |
1811 | return false; | |
1812 | } | |
1813 | #endif /* CONFIG_SLAB_FREELIST_RANDOM */ | |
1814 | ||
81819f0f CL |
1815 | static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) |
1816 | { | |
06428780 | 1817 | struct page *page; |
834f3d11 | 1818 | struct kmem_cache_order_objects oo = s->oo; |
ba52270d | 1819 | gfp_t alloc_gfp; |
4d176711 | 1820 | void *start, *p, *next; |
a50b854e | 1821 | int idx; |
210e7a43 | 1822 | bool shuffle; |
81819f0f | 1823 | |
7e0528da CL |
1824 | flags &= gfp_allowed_mask; |
1825 | ||
d0164adc | 1826 | if (gfpflags_allow_blocking(flags)) |
7e0528da CL |
1827 | local_irq_enable(); |
1828 | ||
b7a49f0d | 1829 | flags |= s->allocflags; |
e12ba74d | 1830 | |
ba52270d PE |
1831 | /* |
1832 | * Let the initial higher-order allocation fail under memory pressure | |
1833 | * so we fall-back to the minimum order allocation. | |
1834 | */ | |
1835 | alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; | |
d0164adc | 1836 | if ((alloc_gfp & __GFP_DIRECT_RECLAIM) && oo_order(oo) > oo_order(s->min)) |
444eb2a4 | 1837 | alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~(__GFP_RECLAIM|__GFP_NOFAIL); |
ba52270d | 1838 | |
5dfb4175 | 1839 | page = alloc_slab_page(s, alloc_gfp, node, oo); |
65c3376a CL |
1840 | if (unlikely(!page)) { |
1841 | oo = s->min; | |
80c3a998 | 1842 | alloc_gfp = flags; |
65c3376a CL |
1843 | /* |
1844 | * Allocation may have failed due to fragmentation. | |
1845 | * Try a lower order alloc if possible | |
1846 | */ | |
5dfb4175 | 1847 | page = alloc_slab_page(s, alloc_gfp, node, oo); |
588f8ba9 TG |
1848 | if (unlikely(!page)) |
1849 | goto out; | |
1850 | stat(s, ORDER_FALLBACK); | |
65c3376a | 1851 | } |
5a896d9e | 1852 | |
834f3d11 | 1853 | page->objects = oo_objects(oo); |
81819f0f | 1854 | |
2e9bd483 | 1855 | account_slab_page(page, oo_order(oo), s, flags); |
1f3147b4 | 1856 | |
1b4f59e3 | 1857 | page->slab_cache = s; |
c03f94cc | 1858 | __SetPageSlab(page); |
2f064f34 | 1859 | if (page_is_pfmemalloc(page)) |
072bb0aa | 1860 | SetPageSlabPfmemalloc(page); |
81819f0f | 1861 | |
a7101224 | 1862 | kasan_poison_slab(page); |
81819f0f | 1863 | |
a7101224 | 1864 | start = page_address(page); |
81819f0f | 1865 | |
a50b854e | 1866 | setup_page_debug(s, page, start); |
0316bec2 | 1867 | |
210e7a43 TG |
1868 | shuffle = shuffle_freelist(s, page); |
1869 | ||
1870 | if (!shuffle) { | |
4d176711 AK |
1871 | start = fixup_red_left(s, start); |
1872 | start = setup_object(s, page, start); | |
1873 | page->freelist = start; | |
18e50661 AK |
1874 | for (idx = 0, p = start; idx < page->objects - 1; idx++) { |
1875 | next = p + s->size; | |
1876 | next = setup_object(s, page, next); | |
1877 | set_freepointer(s, p, next); | |
1878 | p = next; | |
1879 | } | |
1880 | set_freepointer(s, p, NULL); | |
81819f0f | 1881 | } |
81819f0f | 1882 | |
e6e82ea1 | 1883 | page->inuse = page->objects; |
8cb0a506 | 1884 | page->frozen = 1; |
588f8ba9 | 1885 | |
81819f0f | 1886 | out: |
d0164adc | 1887 | if (gfpflags_allow_blocking(flags)) |
588f8ba9 TG |
1888 | local_irq_disable(); |
1889 | if (!page) | |
1890 | return NULL; | |
1891 | ||
588f8ba9 TG |
1892 | inc_slabs_node(s, page_to_nid(page), page->objects); |
1893 | ||
81819f0f CL |
1894 | return page; |
1895 | } | |
1896 | ||
588f8ba9 TG |
1897 | static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) |
1898 | { | |
44405099 LL |
1899 | if (unlikely(flags & GFP_SLAB_BUG_MASK)) |
1900 | flags = kmalloc_fix_flags(flags); | |
588f8ba9 TG |
1901 | |
1902 | return allocate_slab(s, | |
1903 | flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); | |
1904 | } | |
1905 | ||
81819f0f CL |
1906 | static void __free_slab(struct kmem_cache *s, struct page *page) |
1907 | { | |
834f3d11 CL |
1908 | int order = compound_order(page); |
1909 | int pages = 1 << order; | |
81819f0f | 1910 | |
8fc8d666 | 1911 | if (kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS)) { |
81819f0f CL |
1912 | void *p; |
1913 | ||
1914 | slab_pad_check(s, page); | |
224a88be CL |
1915 | for_each_object(p, s, page_address(page), |
1916 | page->objects) | |
f7cb1933 | 1917 | check_object(s, page, p, SLUB_RED_INACTIVE); |
81819f0f CL |
1918 | } |
1919 | ||
072bb0aa | 1920 | __ClearPageSlabPfmemalloc(page); |
49bd5221 | 1921 | __ClearPageSlab(page); |
0c06dd75 VB |
1922 | /* In union with page->mapping where page allocator expects NULL */ |
1923 | page->slab_cache = NULL; | |
1eb5ac64 NP |
1924 | if (current->reclaim_state) |
1925 | current->reclaim_state->reclaimed_slab += pages; | |
74d555be | 1926 | unaccount_slab_page(page, order, s); |
27ee57c9 | 1927 | __free_pages(page, order); |
81819f0f CL |
1928 | } |
1929 | ||
1930 | static void rcu_free_slab(struct rcu_head *h) | |
1931 | { | |
bf68c214 | 1932 | struct page *page = container_of(h, struct page, rcu_head); |
da9a638c | 1933 | |
1b4f59e3 | 1934 | __free_slab(page->slab_cache, page); |
81819f0f CL |
1935 | } |
1936 | ||
1937 | static void free_slab(struct kmem_cache *s, struct page *page) | |
1938 | { | |
5f0d5a3a | 1939 | if (unlikely(s->flags & SLAB_TYPESAFE_BY_RCU)) { |
bf68c214 | 1940 | call_rcu(&page->rcu_head, rcu_free_slab); |
81819f0f CL |
1941 | } else |
1942 | __free_slab(s, page); | |
1943 | } | |
1944 | ||
1945 | static void discard_slab(struct kmem_cache *s, struct page *page) | |
1946 | { | |
205ab99d | 1947 | dec_slabs_node(s, page_to_nid(page), page->objects); |
81819f0f CL |
1948 | free_slab(s, page); |
1949 | } | |
1950 | ||
1951 | /* | |
5cc6eee8 | 1952 | * Management of partially allocated slabs. |
81819f0f | 1953 | */ |
1e4dd946 SR |
1954 | static inline void |
1955 | __add_partial(struct kmem_cache_node *n, struct page *page, int tail) | |
81819f0f | 1956 | { |
e95eed57 | 1957 | n->nr_partial++; |
136333d1 | 1958 | if (tail == DEACTIVATE_TO_TAIL) |
916ac052 | 1959 | list_add_tail(&page->slab_list, &n->partial); |
7c2e132c | 1960 | else |
916ac052 | 1961 | list_add(&page->slab_list, &n->partial); |
81819f0f CL |
1962 | } |
1963 | ||
1e4dd946 SR |
1964 | static inline void add_partial(struct kmem_cache_node *n, |
1965 | struct page *page, int tail) | |
62e346a8 | 1966 | { |
c65c1877 | 1967 | lockdep_assert_held(&n->list_lock); |
1e4dd946 SR |
1968 | __add_partial(n, page, tail); |
1969 | } | |
c65c1877 | 1970 | |
1e4dd946 SR |
1971 | static inline void remove_partial(struct kmem_cache_node *n, |
1972 | struct page *page) | |
1973 | { | |
1974 | lockdep_assert_held(&n->list_lock); | |
916ac052 | 1975 | list_del(&page->slab_list); |
52b4b950 | 1976 | n->nr_partial--; |
1e4dd946 SR |
1977 | } |
1978 | ||
81819f0f | 1979 | /* |
7ced3719 CL |
1980 | * Remove slab from the partial list, freeze it and |
1981 | * return the pointer to the freelist. | |
81819f0f | 1982 | * |
497b66f2 | 1983 | * Returns a list of objects or NULL if it fails. |
81819f0f | 1984 | */ |
497b66f2 | 1985 | static inline void *acquire_slab(struct kmem_cache *s, |
acd19fd1 | 1986 | struct kmem_cache_node *n, struct page *page, |
633b0764 | 1987 | int mode, int *objects) |
81819f0f | 1988 | { |
2cfb7455 CL |
1989 | void *freelist; |
1990 | unsigned long counters; | |
1991 | struct page new; | |
1992 | ||
c65c1877 PZ |
1993 | lockdep_assert_held(&n->list_lock); |
1994 | ||
2cfb7455 CL |
1995 | /* |
1996 | * Zap the freelist and set the frozen bit. | |
1997 | * The old freelist is the list of objects for the | |
1998 | * per cpu allocation list. | |
1999 | */ | |
7ced3719 CL |
2000 | freelist = page->freelist; |
2001 | counters = page->counters; | |
2002 | new.counters = counters; | |
633b0764 | 2003 | *objects = new.objects - new.inuse; |
23910c50 | 2004 | if (mode) { |
7ced3719 | 2005 | new.inuse = page->objects; |
23910c50 PE |
2006 | new.freelist = NULL; |
2007 | } else { | |
2008 | new.freelist = freelist; | |
2009 | } | |
2cfb7455 | 2010 | |
a0132ac0 | 2011 | VM_BUG_ON(new.frozen); |
7ced3719 | 2012 | new.frozen = 1; |
2cfb7455 | 2013 | |
7ced3719 | 2014 | if (!__cmpxchg_double_slab(s, page, |
2cfb7455 | 2015 | freelist, counters, |
02d7633f | 2016 | new.freelist, new.counters, |
7ced3719 | 2017 | "acquire_slab")) |
7ced3719 | 2018 | return NULL; |
2cfb7455 CL |
2019 | |
2020 | remove_partial(n, page); | |
7ced3719 | 2021 | WARN_ON(!freelist); |
49e22585 | 2022 | return freelist; |
81819f0f CL |
2023 | } |
2024 | ||
633b0764 | 2025 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain); |
8ba00bb6 | 2026 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags); |
49e22585 | 2027 | |
81819f0f | 2028 | /* |
672bba3a | 2029 | * Try to allocate a partial slab from a specific node. |
81819f0f | 2030 | */ |
8ba00bb6 JK |
2031 | static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, |
2032 | struct kmem_cache_cpu *c, gfp_t flags) | |
81819f0f | 2033 | { |
49e22585 CL |
2034 | struct page *page, *page2; |
2035 | void *object = NULL; | |
e5d9998f | 2036 | unsigned int available = 0; |
633b0764 | 2037 | int objects; |
81819f0f CL |
2038 | |
2039 | /* | |
2040 | * Racy check. If we mistakenly see no partial slabs then we | |
2041 | * just allocate an empty slab. If we mistakenly try to get a | |
70b6d25e | 2042 | * partial slab and there is none available then get_partial() |
672bba3a | 2043 | * will return NULL. |
81819f0f CL |
2044 | */ |
2045 | if (!n || !n->nr_partial) | |
2046 | return NULL; | |
2047 | ||
2048 | spin_lock(&n->list_lock); | |
916ac052 | 2049 | list_for_each_entry_safe(page, page2, &n->partial, slab_list) { |
8ba00bb6 | 2050 | void *t; |
49e22585 | 2051 | |
8ba00bb6 JK |
2052 | if (!pfmemalloc_match(page, flags)) |
2053 | continue; | |
2054 | ||
633b0764 | 2055 | t = acquire_slab(s, n, page, object == NULL, &objects); |
49e22585 | 2056 | if (!t) |
9b1ea29b | 2057 | break; |
49e22585 | 2058 | |
633b0764 | 2059 | available += objects; |
12d79634 | 2060 | if (!object) { |
49e22585 | 2061 | c->page = page; |
49e22585 | 2062 | stat(s, ALLOC_FROM_PARTIAL); |
49e22585 | 2063 | object = t; |
49e22585 | 2064 | } else { |
633b0764 | 2065 | put_cpu_partial(s, page, 0); |
8028dcea | 2066 | stat(s, CPU_PARTIAL_NODE); |
49e22585 | 2067 | } |
345c905d | 2068 | if (!kmem_cache_has_cpu_partial(s) |
e6d0e1dc | 2069 | || available > slub_cpu_partial(s) / 2) |
49e22585 CL |
2070 | break; |
2071 | ||
497b66f2 | 2072 | } |
81819f0f | 2073 | spin_unlock(&n->list_lock); |
497b66f2 | 2074 | return object; |
81819f0f CL |
2075 | } |
2076 | ||
2077 | /* | |
672bba3a | 2078 | * Get a page from somewhere. Search in increasing NUMA distances. |
81819f0f | 2079 | */ |
de3ec035 | 2080 | static void *get_any_partial(struct kmem_cache *s, gfp_t flags, |
acd19fd1 | 2081 | struct kmem_cache_cpu *c) |
81819f0f CL |
2082 | { |
2083 | #ifdef CONFIG_NUMA | |
2084 | struct zonelist *zonelist; | |
dd1a239f | 2085 | struct zoneref *z; |
54a6eb5c | 2086 | struct zone *zone; |
97a225e6 | 2087 | enum zone_type highest_zoneidx = gfp_zone(flags); |
497b66f2 | 2088 | void *object; |
cc9a6c87 | 2089 | unsigned int cpuset_mems_cookie; |
81819f0f CL |
2090 | |
2091 | /* | |
672bba3a CL |
2092 | * The defrag ratio allows a configuration of the tradeoffs between |
2093 | * inter node defragmentation and node local allocations. A lower | |
2094 | * defrag_ratio increases the tendency to do local allocations | |
2095 | * instead of attempting to obtain partial slabs from other nodes. | |
81819f0f | 2096 | * |
672bba3a CL |
2097 | * If the defrag_ratio is set to 0 then kmalloc() always |
2098 | * returns node local objects. If the ratio is higher then kmalloc() | |
2099 | * may return off node objects because partial slabs are obtained | |
2100 | * from other nodes and filled up. | |
81819f0f | 2101 | * |
43efd3ea LP |
2102 | * If /sys/kernel/slab/xx/remote_node_defrag_ratio is set to 100 |
2103 | * (which makes defrag_ratio = 1000) then every (well almost) | |
2104 | * allocation will first attempt to defrag slab caches on other nodes. | |
2105 | * This means scanning over all nodes to look for partial slabs which | |
2106 | * may be expensive if we do it every time we are trying to find a slab | |
672bba3a | 2107 | * with available objects. |
81819f0f | 2108 | */ |
9824601e CL |
2109 | if (!s->remote_node_defrag_ratio || |
2110 | get_cycles() % 1024 > s->remote_node_defrag_ratio) | |
81819f0f CL |
2111 | return NULL; |
2112 | ||
cc9a6c87 | 2113 | do { |
d26914d1 | 2114 | cpuset_mems_cookie = read_mems_allowed_begin(); |
2a389610 | 2115 | zonelist = node_zonelist(mempolicy_slab_node(), flags); |
97a225e6 | 2116 | for_each_zone_zonelist(zone, z, zonelist, highest_zoneidx) { |
cc9a6c87 MG |
2117 | struct kmem_cache_node *n; |
2118 | ||
2119 | n = get_node(s, zone_to_nid(zone)); | |
2120 | ||
dee2f8aa | 2121 | if (n && cpuset_zone_allowed(zone, flags) && |
cc9a6c87 | 2122 | n->nr_partial > s->min_partial) { |
8ba00bb6 | 2123 | object = get_partial_node(s, n, c, flags); |
cc9a6c87 MG |
2124 | if (object) { |
2125 | /* | |
d26914d1 MG |
2126 | * Don't check read_mems_allowed_retry() |
2127 | * here - if mems_allowed was updated in | |
2128 | * parallel, that was a harmless race | |
2129 | * between allocation and the cpuset | |
2130 | * update | |
cc9a6c87 | 2131 | */ |
cc9a6c87 MG |
2132 | return object; |
2133 | } | |
c0ff7453 | 2134 | } |
81819f0f | 2135 | } |
d26914d1 | 2136 | } while (read_mems_allowed_retry(cpuset_mems_cookie)); |
6dfd1b65 | 2137 | #endif /* CONFIG_NUMA */ |
81819f0f CL |
2138 | return NULL; |
2139 | } | |
2140 | ||
2141 | /* | |
2142 | * Get a partial page, lock it and return it. | |
2143 | */ | |
497b66f2 | 2144 | static void *get_partial(struct kmem_cache *s, gfp_t flags, int node, |
acd19fd1 | 2145 | struct kmem_cache_cpu *c) |
81819f0f | 2146 | { |
497b66f2 | 2147 | void *object; |
a561ce00 JK |
2148 | int searchnode = node; |
2149 | ||
2150 | if (node == NUMA_NO_NODE) | |
2151 | searchnode = numa_mem_id(); | |
81819f0f | 2152 | |
8ba00bb6 | 2153 | object = get_partial_node(s, get_node(s, searchnode), c, flags); |
497b66f2 CL |
2154 | if (object || node != NUMA_NO_NODE) |
2155 | return object; | |
81819f0f | 2156 | |
acd19fd1 | 2157 | return get_any_partial(s, flags, c); |
81819f0f CL |
2158 | } |
2159 | ||
923717cb | 2160 | #ifdef CONFIG_PREEMPTION |
8a5ec0ba | 2161 | /* |
0d645ed1 | 2162 | * Calculate the next globally unique transaction for disambiguation |
8a5ec0ba CL |
2163 | * during cmpxchg. The transactions start with the cpu number and are then |
2164 | * incremented by CONFIG_NR_CPUS. | |
2165 | */ | |
2166 | #define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS) | |
2167 | #else | |
2168 | /* | |
2169 | * No preemption supported therefore also no need to check for | |
2170 | * different cpus. | |
2171 | */ | |
2172 | #define TID_STEP 1 | |
2173 | #endif | |
2174 | ||
2175 | static inline unsigned long next_tid(unsigned long tid) | |
2176 | { | |
2177 | return tid + TID_STEP; | |
2178 | } | |
2179 | ||
9d5f0be0 | 2180 | #ifdef SLUB_DEBUG_CMPXCHG |
8a5ec0ba CL |
2181 | static inline unsigned int tid_to_cpu(unsigned long tid) |
2182 | { | |
2183 | return tid % TID_STEP; | |
2184 | } | |
2185 | ||
2186 | static inline unsigned long tid_to_event(unsigned long tid) | |
2187 | { | |
2188 | return tid / TID_STEP; | |
2189 | } | |
9d5f0be0 | 2190 | #endif |
8a5ec0ba CL |
2191 | |
2192 | static inline unsigned int init_tid(int cpu) | |
2193 | { | |
2194 | return cpu; | |
2195 | } | |
2196 | ||
2197 | static inline void note_cmpxchg_failure(const char *n, | |
2198 | const struct kmem_cache *s, unsigned long tid) | |
2199 | { | |
2200 | #ifdef SLUB_DEBUG_CMPXCHG | |
2201 | unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid); | |
2202 | ||
f9f58285 | 2203 | pr_info("%s %s: cmpxchg redo ", n, s->name); |
8a5ec0ba | 2204 | |
923717cb | 2205 | #ifdef CONFIG_PREEMPTION |
8a5ec0ba | 2206 | if (tid_to_cpu(tid) != tid_to_cpu(actual_tid)) |
f9f58285 | 2207 | pr_warn("due to cpu change %d -> %d\n", |
8a5ec0ba CL |
2208 | tid_to_cpu(tid), tid_to_cpu(actual_tid)); |
2209 | else | |
2210 | #endif | |
2211 | if (tid_to_event(tid) != tid_to_event(actual_tid)) | |
f9f58285 | 2212 | pr_warn("due to cpu running other code. Event %ld->%ld\n", |
8a5ec0ba CL |
2213 | tid_to_event(tid), tid_to_event(actual_tid)); |
2214 | else | |
f9f58285 | 2215 | pr_warn("for unknown reason: actual=%lx was=%lx target=%lx\n", |
8a5ec0ba CL |
2216 | actual_tid, tid, next_tid(tid)); |
2217 | #endif | |
4fdccdfb | 2218 | stat(s, CMPXCHG_DOUBLE_CPU_FAIL); |
8a5ec0ba CL |
2219 | } |
2220 | ||
788e1aad | 2221 | static void init_kmem_cache_cpus(struct kmem_cache *s) |
8a5ec0ba | 2222 | { |
8a5ec0ba CL |
2223 | int cpu; |
2224 | ||
2225 | for_each_possible_cpu(cpu) | |
2226 | per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu); | |
8a5ec0ba | 2227 | } |
2cfb7455 | 2228 | |
81819f0f CL |
2229 | /* |
2230 | * Remove the cpu slab | |
2231 | */ | |
d0e0ac97 | 2232 | static void deactivate_slab(struct kmem_cache *s, struct page *page, |
d4ff6d35 | 2233 | void *freelist, struct kmem_cache_cpu *c) |
81819f0f | 2234 | { |
2cfb7455 | 2235 | enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; |
2cfb7455 | 2236 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
d930ff03 | 2237 | int lock = 0, free_delta = 0; |
2cfb7455 | 2238 | enum slab_modes l = M_NONE, m = M_NONE; |
d930ff03 | 2239 | void *nextfree, *freelist_iter, *freelist_tail; |
136333d1 | 2240 | int tail = DEACTIVATE_TO_HEAD; |
2cfb7455 CL |
2241 | struct page new; |
2242 | struct page old; | |
2243 | ||
2244 | if (page->freelist) { | |
84e554e6 | 2245 | stat(s, DEACTIVATE_REMOTE_FREES); |
136333d1 | 2246 | tail = DEACTIVATE_TO_TAIL; |
2cfb7455 CL |
2247 | } |
2248 | ||
894b8788 | 2249 | /* |
d930ff03 VB |
2250 | * Stage one: Count the objects on cpu's freelist as free_delta and |
2251 | * remember the last object in freelist_tail for later splicing. | |
2cfb7455 | 2252 | */ |
d930ff03 VB |
2253 | freelist_tail = NULL; |
2254 | freelist_iter = freelist; | |
2255 | while (freelist_iter) { | |
2256 | nextfree = get_freepointer(s, freelist_iter); | |
2cfb7455 | 2257 | |
52f23478 DZ |
2258 | /* |
2259 | * If 'nextfree' is invalid, it is possible that the object at | |
d930ff03 VB |
2260 | * 'freelist_iter' is already corrupted. So isolate all objects |
2261 | * starting at 'freelist_iter' by skipping them. | |
52f23478 | 2262 | */ |
d930ff03 | 2263 | if (freelist_corrupted(s, page, &freelist_iter, nextfree)) |
52f23478 DZ |
2264 | break; |
2265 | ||
d930ff03 VB |
2266 | freelist_tail = freelist_iter; |
2267 | free_delta++; | |
2cfb7455 | 2268 | |
d930ff03 | 2269 | freelist_iter = nextfree; |
2cfb7455 CL |
2270 | } |
2271 | ||
894b8788 | 2272 | /* |
d930ff03 VB |
2273 | * Stage two: Unfreeze the page while splicing the per-cpu |
2274 | * freelist to the head of page's freelist. | |
2275 | * | |
2276 | * Ensure that the page is unfrozen while the list presence | |
2277 | * reflects the actual number of objects during unfreeze. | |
2cfb7455 CL |
2278 | * |
2279 | * We setup the list membership and then perform a cmpxchg | |
2280 | * with the count. If there is a mismatch then the page | |
2281 | * is not unfrozen but the page is on the wrong list. | |
2282 | * | |
2283 | * Then we restart the process which may have to remove | |
2284 | * the page from the list that we just put it on again | |
2285 | * because the number of objects in the slab may have | |
2286 | * changed. | |
894b8788 | 2287 | */ |
2cfb7455 | 2288 | redo: |
894b8788 | 2289 | |
d930ff03 VB |
2290 | old.freelist = READ_ONCE(page->freelist); |
2291 | old.counters = READ_ONCE(page->counters); | |
a0132ac0 | 2292 | VM_BUG_ON(!old.frozen); |
7c2e132c | 2293 | |
2cfb7455 CL |
2294 | /* Determine target state of the slab */ |
2295 | new.counters = old.counters; | |
d930ff03 VB |
2296 | if (freelist_tail) { |
2297 | new.inuse -= free_delta; | |
2298 | set_freepointer(s, freelist_tail, old.freelist); | |
2cfb7455 CL |
2299 | new.freelist = freelist; |
2300 | } else | |
2301 | new.freelist = old.freelist; | |
2302 | ||
2303 | new.frozen = 0; | |
2304 | ||
8a5b20ae | 2305 | if (!new.inuse && n->nr_partial >= s->min_partial) |
2cfb7455 CL |
2306 | m = M_FREE; |
2307 | else if (new.freelist) { | |
2308 | m = M_PARTIAL; | |
2309 | if (!lock) { | |
2310 | lock = 1; | |
2311 | /* | |
8bb4e7a2 | 2312 | * Taking the spinlock removes the possibility |
2cfb7455 CL |
2313 | * that acquire_slab() will see a slab page that |
2314 | * is frozen | |
2315 | */ | |
2316 | spin_lock(&n->list_lock); | |
2317 | } | |
2318 | } else { | |
2319 | m = M_FULL; | |
965c4848 | 2320 | if (kmem_cache_debug_flags(s, SLAB_STORE_USER) && !lock) { |
2cfb7455 CL |
2321 | lock = 1; |
2322 | /* | |
2323 | * This also ensures that the scanning of full | |
2324 | * slabs from diagnostic functions will not see | |
2325 | * any frozen slabs. | |
2326 | */ | |
2327 | spin_lock(&n->list_lock); | |
2328 | } | |
2329 | } | |
2330 | ||
2331 | if (l != m) { | |
2cfb7455 | 2332 | if (l == M_PARTIAL) |
2cfb7455 | 2333 | remove_partial(n, page); |
2cfb7455 | 2334 | else if (l == M_FULL) |
c65c1877 | 2335 | remove_full(s, n, page); |
2cfb7455 | 2336 | |
88349a28 | 2337 | if (m == M_PARTIAL) |
2cfb7455 | 2338 | add_partial(n, page, tail); |
88349a28 | 2339 | else if (m == M_FULL) |
2cfb7455 | 2340 | add_full(s, n, page); |
2cfb7455 CL |
2341 | } |
2342 | ||
2343 | l = m; | |
1d07171c | 2344 | if (!__cmpxchg_double_slab(s, page, |
2cfb7455 CL |
2345 | old.freelist, old.counters, |
2346 | new.freelist, new.counters, | |
2347 | "unfreezing slab")) | |
2348 | goto redo; | |
2349 | ||
2cfb7455 CL |
2350 | if (lock) |
2351 | spin_unlock(&n->list_lock); | |
2352 | ||
88349a28 WY |
2353 | if (m == M_PARTIAL) |
2354 | stat(s, tail); | |
2355 | else if (m == M_FULL) | |
2356 | stat(s, DEACTIVATE_FULL); | |
2357 | else if (m == M_FREE) { | |
2cfb7455 CL |
2358 | stat(s, DEACTIVATE_EMPTY); |
2359 | discard_slab(s, page); | |
2360 | stat(s, FREE_SLAB); | |
894b8788 | 2361 | } |
d4ff6d35 WY |
2362 | |
2363 | c->page = NULL; | |
2364 | c->freelist = NULL; | |
81819f0f CL |
2365 | } |
2366 | ||
d24ac77f JK |
2367 | /* |
2368 | * Unfreeze all the cpu partial slabs. | |
2369 | * | |
59a09917 CL |
2370 | * This function must be called with interrupts disabled |
2371 | * for the cpu using c (or some other guarantee must be there | |
2372 | * to guarantee no concurrent accesses). | |
d24ac77f | 2373 | */ |
59a09917 CL |
2374 | static void unfreeze_partials(struct kmem_cache *s, |
2375 | struct kmem_cache_cpu *c) | |
49e22585 | 2376 | { |
345c905d | 2377 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
43d77867 | 2378 | struct kmem_cache_node *n = NULL, *n2 = NULL; |
9ada1934 | 2379 | struct page *page, *discard_page = NULL; |
49e22585 | 2380 | |
4c7ba22e | 2381 | while ((page = slub_percpu_partial(c))) { |
49e22585 CL |
2382 | struct page new; |
2383 | struct page old; | |
2384 | ||
4c7ba22e | 2385 | slub_set_percpu_partial(c, page); |
43d77867 JK |
2386 | |
2387 | n2 = get_node(s, page_to_nid(page)); | |
2388 | if (n != n2) { | |
2389 | if (n) | |
2390 | spin_unlock(&n->list_lock); | |
2391 | ||
2392 | n = n2; | |
2393 | spin_lock(&n->list_lock); | |
2394 | } | |
49e22585 CL |
2395 | |
2396 | do { | |
2397 | ||
2398 | old.freelist = page->freelist; | |
2399 | old.counters = page->counters; | |
a0132ac0 | 2400 | VM_BUG_ON(!old.frozen); |
49e22585 CL |
2401 | |
2402 | new.counters = old.counters; | |
2403 | new.freelist = old.freelist; | |
2404 | ||
2405 | new.frozen = 0; | |
2406 | ||
d24ac77f | 2407 | } while (!__cmpxchg_double_slab(s, page, |
49e22585 CL |
2408 | old.freelist, old.counters, |
2409 | new.freelist, new.counters, | |
2410 | "unfreezing slab")); | |
2411 | ||
8a5b20ae | 2412 | if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) { |
9ada1934 SL |
2413 | page->next = discard_page; |
2414 | discard_page = page; | |
43d77867 JK |
2415 | } else { |
2416 | add_partial(n, page, DEACTIVATE_TO_TAIL); | |
2417 | stat(s, FREE_ADD_PARTIAL); | |
49e22585 CL |
2418 | } |
2419 | } | |
2420 | ||
2421 | if (n) | |
2422 | spin_unlock(&n->list_lock); | |
9ada1934 SL |
2423 | |
2424 | while (discard_page) { | |
2425 | page = discard_page; | |
2426 | discard_page = discard_page->next; | |
2427 | ||
2428 | stat(s, DEACTIVATE_EMPTY); | |
2429 | discard_slab(s, page); | |
2430 | stat(s, FREE_SLAB); | |
2431 | } | |
6dfd1b65 | 2432 | #endif /* CONFIG_SLUB_CPU_PARTIAL */ |
49e22585 CL |
2433 | } |
2434 | ||
2435 | /* | |
9234bae9 WY |
2436 | * Put a page that was just frozen (in __slab_free|get_partial_node) into a |
2437 | * partial page slot if available. | |
49e22585 CL |
2438 | * |
2439 | * If we did not find a slot then simply move all the partials to the | |
2440 | * per node partial list. | |
2441 | */ | |
633b0764 | 2442 | static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) |
49e22585 | 2443 | { |
345c905d | 2444 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
49e22585 CL |
2445 | struct page *oldpage; |
2446 | int pages; | |
2447 | int pobjects; | |
2448 | ||
d6e0b7fa | 2449 | preempt_disable(); |
49e22585 CL |
2450 | do { |
2451 | pages = 0; | |
2452 | pobjects = 0; | |
2453 | oldpage = this_cpu_read(s->cpu_slab->partial); | |
2454 | ||
2455 | if (oldpage) { | |
2456 | pobjects = oldpage->pobjects; | |
2457 | pages = oldpage->pages; | |
bbd4e305 | 2458 | if (drain && pobjects > slub_cpu_partial(s)) { |
49e22585 CL |
2459 | unsigned long flags; |
2460 | /* | |
2461 | * partial array is full. Move the existing | |
2462 | * set to the per node partial list. | |
2463 | */ | |
2464 | local_irq_save(flags); | |
59a09917 | 2465 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); |
49e22585 | 2466 | local_irq_restore(flags); |
e24fc410 | 2467 | oldpage = NULL; |
49e22585 CL |
2468 | pobjects = 0; |
2469 | pages = 0; | |
8028dcea | 2470 | stat(s, CPU_PARTIAL_DRAIN); |
49e22585 CL |
2471 | } |
2472 | } | |
2473 | ||
2474 | pages++; | |
2475 | pobjects += page->objects - page->inuse; | |
2476 | ||
2477 | page->pages = pages; | |
2478 | page->pobjects = pobjects; | |
2479 | page->next = oldpage; | |
2480 | ||
d0e0ac97 CG |
2481 | } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) |
2482 | != oldpage); | |
bbd4e305 | 2483 | if (unlikely(!slub_cpu_partial(s))) { |
d6e0b7fa VD |
2484 | unsigned long flags; |
2485 | ||
2486 | local_irq_save(flags); | |
2487 | unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); | |
2488 | local_irq_restore(flags); | |
2489 | } | |
2490 | preempt_enable(); | |
6dfd1b65 | 2491 | #endif /* CONFIG_SLUB_CPU_PARTIAL */ |
49e22585 CL |
2492 | } |
2493 | ||
dfb4f096 | 2494 | static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) |
81819f0f | 2495 | { |
84e554e6 | 2496 | stat(s, CPUSLAB_FLUSH); |
d4ff6d35 | 2497 | deactivate_slab(s, c->page, c->freelist, c); |
c17dda40 CL |
2498 | |
2499 | c->tid = next_tid(c->tid); | |
81819f0f CL |
2500 | } |
2501 | ||
2502 | /* | |
2503 | * Flush cpu slab. | |
6446faa2 | 2504 | * |
81819f0f CL |
2505 | * Called from IPI handler with interrupts disabled. |
2506 | */ | |
0c710013 | 2507 | static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) |
81819f0f | 2508 | { |
9dfc6e68 | 2509 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
81819f0f | 2510 | |
1265ef2d WY |
2511 | if (c->page) |
2512 | flush_slab(s, c); | |
49e22585 | 2513 | |
1265ef2d | 2514 | unfreeze_partials(s, c); |
81819f0f CL |
2515 | } |
2516 | ||
2517 | static void flush_cpu_slab(void *d) | |
2518 | { | |
2519 | struct kmem_cache *s = d; | |
81819f0f | 2520 | |
dfb4f096 | 2521 | __flush_cpu_slab(s, smp_processor_id()); |
81819f0f CL |
2522 | } |
2523 | ||
a8364d55 GBY |
2524 | static bool has_cpu_slab(int cpu, void *info) |
2525 | { | |
2526 | struct kmem_cache *s = info; | |
2527 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); | |
2528 | ||
a93cf07b | 2529 | return c->page || slub_percpu_partial(c); |
a8364d55 GBY |
2530 | } |
2531 | ||
81819f0f CL |
2532 | static void flush_all(struct kmem_cache *s) |
2533 | { | |
cb923159 | 2534 | on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1); |
81819f0f CL |
2535 | } |
2536 | ||
a96a87bf SAS |
2537 | /* |
2538 | * Use the cpu notifier to insure that the cpu slabs are flushed when | |
2539 | * necessary. | |
2540 | */ | |
2541 | static int slub_cpu_dead(unsigned int cpu) | |
2542 | { | |
2543 | struct kmem_cache *s; | |
2544 | unsigned long flags; | |
2545 | ||
2546 | mutex_lock(&slab_mutex); | |
2547 | list_for_each_entry(s, &slab_caches, list) { | |
2548 | local_irq_save(flags); | |
2549 | __flush_cpu_slab(s, cpu); | |
2550 | local_irq_restore(flags); | |
2551 | } | |
2552 | mutex_unlock(&slab_mutex); | |
2553 | return 0; | |
2554 | } | |
2555 | ||
dfb4f096 CL |
2556 | /* |
2557 | * Check if the objects in a per cpu structure fit numa | |
2558 | * locality expectations. | |
2559 | */ | |
57d437d2 | 2560 | static inline int node_match(struct page *page, int node) |
dfb4f096 CL |
2561 | { |
2562 | #ifdef CONFIG_NUMA | |
6159d0f5 | 2563 | if (node != NUMA_NO_NODE && page_to_nid(page) != node) |
dfb4f096 CL |
2564 | return 0; |
2565 | #endif | |
2566 | return 1; | |
2567 | } | |
2568 | ||
9a02d699 | 2569 | #ifdef CONFIG_SLUB_DEBUG |
781b2ba6 PE |
2570 | static int count_free(struct page *page) |
2571 | { | |
2572 | return page->objects - page->inuse; | |
2573 | } | |
2574 | ||
9a02d699 DR |
2575 | static inline unsigned long node_nr_objs(struct kmem_cache_node *n) |
2576 | { | |
2577 | return atomic_long_read(&n->total_objects); | |
2578 | } | |
2579 | #endif /* CONFIG_SLUB_DEBUG */ | |
2580 | ||
2581 | #if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SYSFS) | |
781b2ba6 PE |
2582 | static unsigned long count_partial(struct kmem_cache_node *n, |
2583 | int (*get_count)(struct page *)) | |
2584 | { | |
2585 | unsigned long flags; | |
2586 | unsigned long x = 0; | |
2587 | struct page *page; | |
2588 | ||
2589 | spin_lock_irqsave(&n->list_lock, flags); | |
916ac052 | 2590 | list_for_each_entry(page, &n->partial, slab_list) |
781b2ba6 PE |
2591 | x += get_count(page); |
2592 | spin_unlock_irqrestore(&n->list_lock, flags); | |
2593 | return x; | |
2594 | } | |
9a02d699 | 2595 | #endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */ |
26c02cf0 | 2596 | |
781b2ba6 PE |
2597 | static noinline void |
2598 | slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid) | |
2599 | { | |
9a02d699 DR |
2600 | #ifdef CONFIG_SLUB_DEBUG |
2601 | static DEFINE_RATELIMIT_STATE(slub_oom_rs, DEFAULT_RATELIMIT_INTERVAL, | |
2602 | DEFAULT_RATELIMIT_BURST); | |
781b2ba6 | 2603 | int node; |
fa45dc25 | 2604 | struct kmem_cache_node *n; |
781b2ba6 | 2605 | |
9a02d699 DR |
2606 | if ((gfpflags & __GFP_NOWARN) || !__ratelimit(&slub_oom_rs)) |
2607 | return; | |
2608 | ||
5b3810e5 VB |
2609 | pr_warn("SLUB: Unable to allocate memory on node %d, gfp=%#x(%pGg)\n", |
2610 | nid, gfpflags, &gfpflags); | |
19af27af | 2611 | pr_warn(" cache: %s, object size: %u, buffer size: %u, default order: %u, min order: %u\n", |
f9f58285 FF |
2612 | s->name, s->object_size, s->size, oo_order(s->oo), |
2613 | oo_order(s->min)); | |
781b2ba6 | 2614 | |
3b0efdfa | 2615 | if (oo_order(s->min) > get_order(s->object_size)) |
f9f58285 FF |
2616 | pr_warn(" %s debugging increased min order, use slub_debug=O to disable.\n", |
2617 | s->name); | |
fa5ec8a1 | 2618 | |
fa45dc25 | 2619 | for_each_kmem_cache_node(s, node, n) { |
781b2ba6 PE |
2620 | unsigned long nr_slabs; |
2621 | unsigned long nr_objs; | |
2622 | unsigned long nr_free; | |
2623 | ||
26c02cf0 AB |
2624 | nr_free = count_partial(n, count_free); |
2625 | nr_slabs = node_nr_slabs(n); | |
2626 | nr_objs = node_nr_objs(n); | |
781b2ba6 | 2627 | |
f9f58285 | 2628 | pr_warn(" node %d: slabs: %ld, objs: %ld, free: %ld\n", |
781b2ba6 PE |
2629 | node, nr_slabs, nr_objs, nr_free); |
2630 | } | |
9a02d699 | 2631 | #endif |
781b2ba6 PE |
2632 | } |
2633 | ||
497b66f2 CL |
2634 | static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags, |
2635 | int node, struct kmem_cache_cpu **pc) | |
2636 | { | |
6faa6833 | 2637 | void *freelist; |
188fd063 CL |
2638 | struct kmem_cache_cpu *c = *pc; |
2639 | struct page *page; | |
497b66f2 | 2640 | |
128227e7 MW |
2641 | WARN_ON_ONCE(s->ctor && (flags & __GFP_ZERO)); |
2642 | ||
188fd063 | 2643 | freelist = get_partial(s, flags, node, c); |
497b66f2 | 2644 | |
188fd063 CL |
2645 | if (freelist) |
2646 | return freelist; | |
2647 | ||
2648 | page = new_slab(s, flags, node); | |
497b66f2 | 2649 | if (page) { |
7c8e0181 | 2650 | c = raw_cpu_ptr(s->cpu_slab); |
497b66f2 CL |
2651 | if (c->page) |
2652 | flush_slab(s, c); | |
2653 | ||
2654 | /* | |
2655 | * No other reference to the page yet so we can | |
2656 | * muck around with it freely without cmpxchg | |
2657 | */ | |
6faa6833 | 2658 | freelist = page->freelist; |
497b66f2 CL |
2659 | page->freelist = NULL; |
2660 | ||
2661 | stat(s, ALLOC_SLAB); | |
497b66f2 CL |
2662 | c->page = page; |
2663 | *pc = c; | |
edde82b6 | 2664 | } |
497b66f2 | 2665 | |
6faa6833 | 2666 | return freelist; |
497b66f2 CL |
2667 | } |
2668 | ||
072bb0aa MG |
2669 | static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags) |
2670 | { | |
2671 | if (unlikely(PageSlabPfmemalloc(page))) | |
2672 | return gfp_pfmemalloc_allowed(gfpflags); | |
2673 | ||
2674 | return true; | |
2675 | } | |
2676 | ||
213eeb9f | 2677 | /* |
d0e0ac97 CG |
2678 | * Check the page->freelist of a page and either transfer the freelist to the |
2679 | * per cpu freelist or deactivate the page. | |
213eeb9f CL |
2680 | * |
2681 | * The page is still frozen if the return value is not NULL. | |
2682 | * | |
2683 | * If this function returns NULL then the page has been unfrozen. | |
d24ac77f JK |
2684 | * |
2685 | * This function must be called with interrupt disabled. | |
213eeb9f CL |
2686 | */ |
2687 | static inline void *get_freelist(struct kmem_cache *s, struct page *page) | |
2688 | { | |
2689 | struct page new; | |
2690 | unsigned long counters; | |
2691 | void *freelist; | |
2692 | ||
2693 | do { | |
2694 | freelist = page->freelist; | |
2695 | counters = page->counters; | |
6faa6833 | 2696 | |
213eeb9f | 2697 | new.counters = counters; |
a0132ac0 | 2698 | VM_BUG_ON(!new.frozen); |
213eeb9f CL |
2699 | |
2700 | new.inuse = page->objects; | |
2701 | new.frozen = freelist != NULL; | |
2702 | ||
d24ac77f | 2703 | } while (!__cmpxchg_double_slab(s, page, |
213eeb9f CL |
2704 | freelist, counters, |
2705 | NULL, new.counters, | |
2706 | "get_freelist")); | |
2707 | ||
2708 | return freelist; | |
2709 | } | |
2710 | ||
81819f0f | 2711 | /* |
894b8788 CL |
2712 | * Slow path. The lockless freelist is empty or we need to perform |
2713 | * debugging duties. | |
2714 | * | |
894b8788 CL |
2715 | * Processing is still very fast if new objects have been freed to the |
2716 | * regular freelist. In that case we simply take over the regular freelist | |
2717 | * as the lockless freelist and zap the regular freelist. | |
81819f0f | 2718 | * |
894b8788 CL |
2719 | * If that is not working then we fall back to the partial lists. We take the |
2720 | * first element of the freelist as the object to allocate now and move the | |
2721 | * rest of the freelist to the lockless freelist. | |
81819f0f | 2722 | * |
894b8788 | 2723 | * And if we were unable to get a new slab from the partial slab lists then |
6446faa2 CL |
2724 | * we need to allocate a new slab. This is the slowest path since it involves |
2725 | * a call to the page allocator and the setup of a new slab. | |
a380a3c7 CL |
2726 | * |
2727 | * Version of __slab_alloc to use when we know that interrupts are | |
2728 | * already disabled (which is the case for bulk allocation). | |
81819f0f | 2729 | */ |
a380a3c7 | 2730 | static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
ce71e27c | 2731 | unsigned long addr, struct kmem_cache_cpu *c) |
81819f0f | 2732 | { |
6faa6833 | 2733 | void *freelist; |
f6e7def7 | 2734 | struct page *page; |
81819f0f | 2735 | |
9f986d99 AW |
2736 | stat(s, ALLOC_SLOWPATH); |
2737 | ||
f6e7def7 | 2738 | page = c->page; |
0715e6c5 VB |
2739 | if (!page) { |
2740 | /* | |
2741 | * if the node is not online or has no normal memory, just | |
2742 | * ignore the node constraint | |
2743 | */ | |
2744 | if (unlikely(node != NUMA_NO_NODE && | |
7e1fa93d | 2745 | !node_isset(node, slab_nodes))) |
0715e6c5 | 2746 | node = NUMA_NO_NODE; |
81819f0f | 2747 | goto new_slab; |
0715e6c5 | 2748 | } |
49e22585 | 2749 | redo: |
6faa6833 | 2750 | |
57d437d2 | 2751 | if (unlikely(!node_match(page, node))) { |
0715e6c5 VB |
2752 | /* |
2753 | * same as above but node_match() being false already | |
2754 | * implies node != NUMA_NO_NODE | |
2755 | */ | |
7e1fa93d | 2756 | if (!node_isset(node, slab_nodes)) { |
0715e6c5 VB |
2757 | node = NUMA_NO_NODE; |
2758 | goto redo; | |
2759 | } else { | |
a561ce00 | 2760 | stat(s, ALLOC_NODE_MISMATCH); |
d4ff6d35 | 2761 | deactivate_slab(s, page, c->freelist, c); |
a561ce00 JK |
2762 | goto new_slab; |
2763 | } | |
fc59c053 | 2764 | } |
6446faa2 | 2765 | |
072bb0aa MG |
2766 | /* |
2767 | * By rights, we should be searching for a slab page that was | |
2768 | * PFMEMALLOC but right now, we are losing the pfmemalloc | |
2769 | * information when the page leaves the per-cpu allocator | |
2770 | */ | |
2771 | if (unlikely(!pfmemalloc_match(page, gfpflags))) { | |
d4ff6d35 | 2772 | deactivate_slab(s, page, c->freelist, c); |
072bb0aa MG |
2773 | goto new_slab; |
2774 | } | |
2775 | ||
73736e03 | 2776 | /* must check again c->freelist in case of cpu migration or IRQ */ |
6faa6833 CL |
2777 | freelist = c->freelist; |
2778 | if (freelist) | |
73736e03 | 2779 | goto load_freelist; |
03e404af | 2780 | |
f6e7def7 | 2781 | freelist = get_freelist(s, page); |
6446faa2 | 2782 | |
6faa6833 | 2783 | if (!freelist) { |
03e404af CL |
2784 | c->page = NULL; |
2785 | stat(s, DEACTIVATE_BYPASS); | |
fc59c053 | 2786 | goto new_slab; |
03e404af | 2787 | } |
6446faa2 | 2788 | |
84e554e6 | 2789 | stat(s, ALLOC_REFILL); |
6446faa2 | 2790 | |
894b8788 | 2791 | load_freelist: |
507effea CL |
2792 | /* |
2793 | * freelist is pointing to the list of objects to be used. | |
2794 | * page is pointing to the page from which the objects are obtained. | |
2795 | * That page must be frozen for per cpu allocations to work. | |
2796 | */ | |
a0132ac0 | 2797 | VM_BUG_ON(!c->page->frozen); |
6faa6833 | 2798 | c->freelist = get_freepointer(s, freelist); |
8a5ec0ba | 2799 | c->tid = next_tid(c->tid); |
6faa6833 | 2800 | return freelist; |
81819f0f | 2801 | |
81819f0f | 2802 | new_slab: |
2cfb7455 | 2803 | |
a93cf07b WY |
2804 | if (slub_percpu_partial(c)) { |
2805 | page = c->page = slub_percpu_partial(c); | |
2806 | slub_set_percpu_partial(c, page); | |
49e22585 | 2807 | stat(s, CPU_PARTIAL_ALLOC); |
49e22585 | 2808 | goto redo; |
81819f0f CL |
2809 | } |
2810 | ||
188fd063 | 2811 | freelist = new_slab_objects(s, gfpflags, node, &c); |
01ad8a7b | 2812 | |
f4697436 | 2813 | if (unlikely(!freelist)) { |
9a02d699 | 2814 | slab_out_of_memory(s, gfpflags, node); |
f4697436 | 2815 | return NULL; |
81819f0f | 2816 | } |
2cfb7455 | 2817 | |
f6e7def7 | 2818 | page = c->page; |
5091b74a | 2819 | if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) |
4b6f0750 | 2820 | goto load_freelist; |
2cfb7455 | 2821 | |
497b66f2 | 2822 | /* Only entered in the debug case */ |
d0e0ac97 CG |
2823 | if (kmem_cache_debug(s) && |
2824 | !alloc_debug_processing(s, page, freelist, addr)) | |
497b66f2 | 2825 | goto new_slab; /* Slab failed checks. Next slab needed */ |
894b8788 | 2826 | |
d4ff6d35 | 2827 | deactivate_slab(s, page, get_freepointer(s, freelist), c); |
6faa6833 | 2828 | return freelist; |
894b8788 CL |
2829 | } |
2830 | ||
a380a3c7 CL |
2831 | /* |
2832 | * Another one that disabled interrupt and compensates for possible | |
2833 | * cpu changes by refetching the per cpu area pointer. | |
2834 | */ | |
2835 | static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, | |
2836 | unsigned long addr, struct kmem_cache_cpu *c) | |
2837 | { | |
2838 | void *p; | |
2839 | unsigned long flags; | |
2840 | ||
2841 | local_irq_save(flags); | |
923717cb | 2842 | #ifdef CONFIG_PREEMPTION |
a380a3c7 CL |
2843 | /* |
2844 | * We may have been preempted and rescheduled on a different | |
2845 | * cpu before disabling interrupts. Need to reload cpu area | |
2846 | * pointer. | |
2847 | */ | |
2848 | c = this_cpu_ptr(s->cpu_slab); | |
2849 | #endif | |
2850 | ||
2851 | p = ___slab_alloc(s, gfpflags, node, addr, c); | |
2852 | local_irq_restore(flags); | |
2853 | return p; | |
2854 | } | |
2855 | ||
0f181f9f AP |
2856 | /* |
2857 | * If the object has been wiped upon free, make sure it's fully initialized by | |
2858 | * zeroing out freelist pointer. | |
2859 | */ | |
2860 | static __always_inline void maybe_wipe_obj_freeptr(struct kmem_cache *s, | |
2861 | void *obj) | |
2862 | { | |
2863 | if (unlikely(slab_want_init_on_free(s)) && obj) | |
ce5716c6 AK |
2864 | memset((void *)((char *)kasan_reset_tag(obj) + s->offset), |
2865 | 0, sizeof(void *)); | |
0f181f9f AP |
2866 | } |
2867 | ||
894b8788 CL |
2868 | /* |
2869 | * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc) | |
2870 | * have the fastpath folded into their functions. So no function call | |
2871 | * overhead for requests that can be satisfied on the fastpath. | |
2872 | * | |
2873 | * The fastpath works by first checking if the lockless freelist can be used. | |
2874 | * If not then __slab_alloc is called for slow processing. | |
2875 | * | |
2876 | * Otherwise we can simply pick the next object from the lockless free list. | |
2877 | */ | |
2b847c3c | 2878 | static __always_inline void *slab_alloc_node(struct kmem_cache *s, |
b89fb5ef | 2879 | gfp_t gfpflags, int node, unsigned long addr, size_t orig_size) |
894b8788 | 2880 | { |
03ec0ed5 | 2881 | void *object; |
dfb4f096 | 2882 | struct kmem_cache_cpu *c; |
57d437d2 | 2883 | struct page *page; |
8a5ec0ba | 2884 | unsigned long tid; |
964d4bd3 | 2885 | struct obj_cgroup *objcg = NULL; |
da844b78 | 2886 | bool init = false; |
1f84260c | 2887 | |
964d4bd3 | 2888 | s = slab_pre_alloc_hook(s, &objcg, 1, gfpflags); |
8135be5a | 2889 | if (!s) |
773ff60e | 2890 | return NULL; |
b89fb5ef AP |
2891 | |
2892 | object = kfence_alloc(s, orig_size, gfpflags); | |
2893 | if (unlikely(object)) | |
2894 | goto out; | |
2895 | ||
8a5ec0ba | 2896 | redo: |
8a5ec0ba CL |
2897 | /* |
2898 | * Must read kmem_cache cpu data via this cpu ptr. Preemption is | |
2899 | * enabled. We may switch back and forth between cpus while | |
2900 | * reading from one cpu area. That does not matter as long | |
2901 | * as we end up on the original cpu again when doing the cmpxchg. | |
7cccd80b | 2902 | * |
9aabf810 | 2903 | * We should guarantee that tid and kmem_cache are retrieved on |
923717cb | 2904 | * the same cpu. It could be different if CONFIG_PREEMPTION so we need |
9aabf810 | 2905 | * to check if it is matched or not. |
8a5ec0ba | 2906 | */ |
9aabf810 JK |
2907 | do { |
2908 | tid = this_cpu_read(s->cpu_slab->tid); | |
2909 | c = raw_cpu_ptr(s->cpu_slab); | |
923717cb | 2910 | } while (IS_ENABLED(CONFIG_PREEMPTION) && |
859b7a0e | 2911 | unlikely(tid != READ_ONCE(c->tid))); |
9aabf810 JK |
2912 | |
2913 | /* | |
2914 | * Irqless object alloc/free algorithm used here depends on sequence | |
2915 | * of fetching cpu_slab's data. tid should be fetched before anything | |
2916 | * on c to guarantee that object and page associated with previous tid | |
2917 | * won't be used with current tid. If we fetch tid first, object and | |
2918 | * page could be one associated with next tid and our alloc/free | |
2919 | * request will be failed. In this case, we will retry. So, no problem. | |
2920 | */ | |
2921 | barrier(); | |
8a5ec0ba | 2922 | |
8a5ec0ba CL |
2923 | /* |
2924 | * The transaction ids are globally unique per cpu and per operation on | |
2925 | * a per cpu queue. Thus they can be guarantee that the cmpxchg_double | |
2926 | * occurs on the right processor and that there was no operation on the | |
2927 | * linked list in between. | |
2928 | */ | |
8a5ec0ba | 2929 | |
9dfc6e68 | 2930 | object = c->freelist; |
57d437d2 | 2931 | page = c->page; |
22e4663e | 2932 | if (unlikely(!object || !page || !node_match(page, node))) { |
dfb4f096 | 2933 | object = __slab_alloc(s, gfpflags, node, addr, c); |
8eae1492 | 2934 | } else { |
0ad9500e ED |
2935 | void *next_object = get_freepointer_safe(s, object); |
2936 | ||
8a5ec0ba | 2937 | /* |
25985edc | 2938 | * The cmpxchg will only match if there was no additional |
8a5ec0ba CL |
2939 | * operation and if we are on the right processor. |
2940 | * | |
d0e0ac97 CG |
2941 | * The cmpxchg does the following atomically (without lock |
2942 | * semantics!) | |
8a5ec0ba CL |
2943 | * 1. Relocate first pointer to the current per cpu area. |
2944 | * 2. Verify that tid and freelist have not been changed | |
2945 | * 3. If they were not changed replace tid and freelist | |
2946 | * | |
d0e0ac97 CG |
2947 | * Since this is without lock semantics the protection is only |
2948 | * against code executing on this cpu *not* from access by | |
2949 | * other cpus. | |
8a5ec0ba | 2950 | */ |
933393f5 | 2951 | if (unlikely(!this_cpu_cmpxchg_double( |
8a5ec0ba CL |
2952 | s->cpu_slab->freelist, s->cpu_slab->tid, |
2953 | object, tid, | |
0ad9500e | 2954 | next_object, next_tid(tid)))) { |
8a5ec0ba CL |
2955 | |
2956 | note_cmpxchg_failure("slab_alloc", s, tid); | |
2957 | goto redo; | |
2958 | } | |
0ad9500e | 2959 | prefetch_freepointer(s, next_object); |
84e554e6 | 2960 | stat(s, ALLOC_FASTPATH); |
894b8788 | 2961 | } |
0f181f9f | 2962 | |
ce5716c6 | 2963 | maybe_wipe_obj_freeptr(s, object); |
da844b78 | 2964 | init = slab_want_init_on_alloc(gfpflags, s); |
d07dbea4 | 2965 | |
b89fb5ef | 2966 | out: |
da844b78 | 2967 | slab_post_alloc_hook(s, objcg, gfpflags, 1, &object, init); |
5a896d9e | 2968 | |
894b8788 | 2969 | return object; |
81819f0f CL |
2970 | } |
2971 | ||
2b847c3c | 2972 | static __always_inline void *slab_alloc(struct kmem_cache *s, |
b89fb5ef | 2973 | gfp_t gfpflags, unsigned long addr, size_t orig_size) |
2b847c3c | 2974 | { |
b89fb5ef | 2975 | return slab_alloc_node(s, gfpflags, NUMA_NO_NODE, addr, orig_size); |
2b847c3c EG |
2976 | } |
2977 | ||
81819f0f CL |
2978 | void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) |
2979 | { | |
b89fb5ef | 2980 | void *ret = slab_alloc(s, gfpflags, _RET_IP_, s->object_size); |
5b882be4 | 2981 | |
d0e0ac97 CG |
2982 | trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size, |
2983 | s->size, gfpflags); | |
5b882be4 EGM |
2984 | |
2985 | return ret; | |
81819f0f CL |
2986 | } |
2987 | EXPORT_SYMBOL(kmem_cache_alloc); | |
2988 | ||
0f24f128 | 2989 | #ifdef CONFIG_TRACING |
4a92379b RK |
2990 | void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) |
2991 | { | |
b89fb5ef | 2992 | void *ret = slab_alloc(s, gfpflags, _RET_IP_, size); |
4a92379b | 2993 | trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); |
0116523c | 2994 | ret = kasan_kmalloc(s, ret, size, gfpflags); |
4a92379b RK |
2995 | return ret; |
2996 | } | |
2997 | EXPORT_SYMBOL(kmem_cache_alloc_trace); | |
5b882be4 EGM |
2998 | #endif |
2999 | ||
81819f0f CL |
3000 | #ifdef CONFIG_NUMA |
3001 | void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) | |
3002 | { | |
b89fb5ef | 3003 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_, s->object_size); |
5b882be4 | 3004 | |
ca2b84cb | 3005 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
3b0efdfa | 3006 | s->object_size, s->size, gfpflags, node); |
5b882be4 EGM |
3007 | |
3008 | return ret; | |
81819f0f CL |
3009 | } |
3010 | EXPORT_SYMBOL(kmem_cache_alloc_node); | |
81819f0f | 3011 | |
0f24f128 | 3012 | #ifdef CONFIG_TRACING |
4a92379b | 3013 | void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
5b882be4 | 3014 | gfp_t gfpflags, |
4a92379b | 3015 | int node, size_t size) |
5b882be4 | 3016 | { |
b89fb5ef | 3017 | void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_, size); |
4a92379b RK |
3018 | |
3019 | trace_kmalloc_node(_RET_IP_, ret, | |
3020 | size, s->size, gfpflags, node); | |
0316bec2 | 3021 | |
0116523c | 3022 | ret = kasan_kmalloc(s, ret, size, gfpflags); |
4a92379b | 3023 | return ret; |
5b882be4 | 3024 | } |
4a92379b | 3025 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
5b882be4 | 3026 | #endif |
6dfd1b65 | 3027 | #endif /* CONFIG_NUMA */ |
5b882be4 | 3028 | |
81819f0f | 3029 | /* |
94e4d712 | 3030 | * Slow path handling. This may still be called frequently since objects |
894b8788 | 3031 | * have a longer lifetime than the cpu slabs in most processing loads. |
81819f0f | 3032 | * |
894b8788 CL |
3033 | * So we still attempt to reduce cache line usage. Just take the slab |
3034 | * lock and free the item. If there is no additional partial page | |
3035 | * handling required then we can return immediately. | |
81819f0f | 3036 | */ |
894b8788 | 3037 | static void __slab_free(struct kmem_cache *s, struct page *page, |
81084651 JDB |
3038 | void *head, void *tail, int cnt, |
3039 | unsigned long addr) | |
3040 | ||
81819f0f CL |
3041 | { |
3042 | void *prior; | |
2cfb7455 | 3043 | int was_frozen; |
2cfb7455 CL |
3044 | struct page new; |
3045 | unsigned long counters; | |
3046 | struct kmem_cache_node *n = NULL; | |
3f649ab7 | 3047 | unsigned long flags; |
81819f0f | 3048 | |
8a5ec0ba | 3049 | stat(s, FREE_SLOWPATH); |
81819f0f | 3050 | |
b89fb5ef AP |
3051 | if (kfence_free(head)) |
3052 | return; | |
3053 | ||
19c7ff9e | 3054 | if (kmem_cache_debug(s) && |
282acb43 | 3055 | !free_debug_processing(s, page, head, tail, cnt, addr)) |
80f08c19 | 3056 | return; |
6446faa2 | 3057 | |
2cfb7455 | 3058 | do { |
837d678d JK |
3059 | if (unlikely(n)) { |
3060 | spin_unlock_irqrestore(&n->list_lock, flags); | |
3061 | n = NULL; | |
3062 | } | |
2cfb7455 CL |
3063 | prior = page->freelist; |
3064 | counters = page->counters; | |
81084651 | 3065 | set_freepointer(s, tail, prior); |
2cfb7455 CL |
3066 | new.counters = counters; |
3067 | was_frozen = new.frozen; | |
81084651 | 3068 | new.inuse -= cnt; |
837d678d | 3069 | if ((!new.inuse || !prior) && !was_frozen) { |
49e22585 | 3070 | |
c65c1877 | 3071 | if (kmem_cache_has_cpu_partial(s) && !prior) { |
49e22585 CL |
3072 | |
3073 | /* | |
d0e0ac97 CG |
3074 | * Slab was on no list before and will be |
3075 | * partially empty | |
3076 | * We can defer the list move and instead | |
3077 | * freeze it. | |
49e22585 CL |
3078 | */ |
3079 | new.frozen = 1; | |
3080 | ||
c65c1877 | 3081 | } else { /* Needs to be taken off a list */ |
49e22585 | 3082 | |
b455def2 | 3083 | n = get_node(s, page_to_nid(page)); |
49e22585 CL |
3084 | /* |
3085 | * Speculatively acquire the list_lock. | |
3086 | * If the cmpxchg does not succeed then we may | |
3087 | * drop the list_lock without any processing. | |
3088 | * | |
3089 | * Otherwise the list_lock will synchronize with | |
3090 | * other processors updating the list of slabs. | |
3091 | */ | |
3092 | spin_lock_irqsave(&n->list_lock, flags); | |
3093 | ||
3094 | } | |
2cfb7455 | 3095 | } |
81819f0f | 3096 | |
2cfb7455 CL |
3097 | } while (!cmpxchg_double_slab(s, page, |
3098 | prior, counters, | |
81084651 | 3099 | head, new.counters, |
2cfb7455 | 3100 | "__slab_free")); |
81819f0f | 3101 | |
2cfb7455 | 3102 | if (likely(!n)) { |
49e22585 | 3103 | |
c270cf30 AW |
3104 | if (likely(was_frozen)) { |
3105 | /* | |
3106 | * The list lock was not taken therefore no list | |
3107 | * activity can be necessary. | |
3108 | */ | |
3109 | stat(s, FREE_FROZEN); | |
3110 | } else if (new.frozen) { | |
3111 | /* | |
3112 | * If we just froze the page then put it onto the | |
3113 | * per cpu partial list. | |
3114 | */ | |
49e22585 | 3115 | put_cpu_partial(s, page, 1); |
8028dcea AS |
3116 | stat(s, CPU_PARTIAL_FREE); |
3117 | } | |
c270cf30 | 3118 | |
b455def2 L |
3119 | return; |
3120 | } | |
81819f0f | 3121 | |
8a5b20ae | 3122 | if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) |
837d678d JK |
3123 | goto slab_empty; |
3124 | ||
81819f0f | 3125 | /* |
837d678d JK |
3126 | * Objects left in the slab. If it was not on the partial list before |
3127 | * then add it. | |
81819f0f | 3128 | */ |
345c905d | 3129 | if (!kmem_cache_has_cpu_partial(s) && unlikely(!prior)) { |
a4d3f891 | 3130 | remove_full(s, n, page); |
837d678d JK |
3131 | add_partial(n, page, DEACTIVATE_TO_TAIL); |
3132 | stat(s, FREE_ADD_PARTIAL); | |
8ff12cfc | 3133 | } |
80f08c19 | 3134 | spin_unlock_irqrestore(&n->list_lock, flags); |
81819f0f CL |
3135 | return; |
3136 | ||
3137 | slab_empty: | |
a973e9dd | 3138 | if (prior) { |
81819f0f | 3139 | /* |
6fbabb20 | 3140 | * Slab on the partial list. |
81819f0f | 3141 | */ |
5cc6eee8 | 3142 | remove_partial(n, page); |
84e554e6 | 3143 | stat(s, FREE_REMOVE_PARTIAL); |
c65c1877 | 3144 | } else { |
6fbabb20 | 3145 | /* Slab must be on the full list */ |
c65c1877 PZ |
3146 | remove_full(s, n, page); |
3147 | } | |
2cfb7455 | 3148 | |
80f08c19 | 3149 | spin_unlock_irqrestore(&n->list_lock, flags); |
84e554e6 | 3150 | stat(s, FREE_SLAB); |
81819f0f | 3151 | discard_slab(s, page); |
81819f0f CL |
3152 | } |
3153 | ||
894b8788 CL |
3154 | /* |
3155 | * Fastpath with forced inlining to produce a kfree and kmem_cache_free that | |
3156 | * can perform fastpath freeing without additional function calls. | |
3157 | * | |
3158 | * The fastpath is only possible if we are freeing to the current cpu slab | |
3159 | * of this processor. This typically the case if we have just allocated | |
3160 | * the item before. | |
3161 | * | |
3162 | * If fastpath is not possible then fall back to __slab_free where we deal | |
3163 | * with all sorts of special processing. | |
81084651 JDB |
3164 | * |
3165 | * Bulk free of a freelist with several objects (all pointing to the | |
3166 | * same page) possible by specifying head and tail ptr, plus objects | |
3167 | * count (cnt). Bulk free indicated by tail pointer being set. | |
894b8788 | 3168 | */ |
80a9201a AP |
3169 | static __always_inline void do_slab_free(struct kmem_cache *s, |
3170 | struct page *page, void *head, void *tail, | |
3171 | int cnt, unsigned long addr) | |
894b8788 | 3172 | { |
81084651 | 3173 | void *tail_obj = tail ? : head; |
dfb4f096 | 3174 | struct kmem_cache_cpu *c; |
8a5ec0ba | 3175 | unsigned long tid; |
964d4bd3 | 3176 | |
d1b2cf6c | 3177 | memcg_slab_free_hook(s, &head, 1); |
8a5ec0ba CL |
3178 | redo: |
3179 | /* | |
3180 | * Determine the currently cpus per cpu slab. | |
3181 | * The cpu may change afterward. However that does not matter since | |
3182 | * data is retrieved via this pointer. If we are on the same cpu | |
2ae44005 | 3183 | * during the cmpxchg then the free will succeed. |
8a5ec0ba | 3184 | */ |
9aabf810 JK |
3185 | do { |
3186 | tid = this_cpu_read(s->cpu_slab->tid); | |
3187 | c = raw_cpu_ptr(s->cpu_slab); | |
923717cb | 3188 | } while (IS_ENABLED(CONFIG_PREEMPTION) && |
859b7a0e | 3189 | unlikely(tid != READ_ONCE(c->tid))); |
c016b0bd | 3190 | |
9aabf810 JK |
3191 | /* Same with comment on barrier() in slab_alloc_node() */ |
3192 | barrier(); | |
c016b0bd | 3193 | |
442b06bc | 3194 | if (likely(page == c->page)) { |
5076190d LT |
3195 | void **freelist = READ_ONCE(c->freelist); |
3196 | ||
3197 | set_freepointer(s, tail_obj, freelist); | |
8a5ec0ba | 3198 | |
933393f5 | 3199 | if (unlikely(!this_cpu_cmpxchg_double( |
8a5ec0ba | 3200 | s->cpu_slab->freelist, s->cpu_slab->tid, |
5076190d | 3201 | freelist, tid, |
81084651 | 3202 | head, next_tid(tid)))) { |
8a5ec0ba CL |
3203 | |
3204 | note_cmpxchg_failure("slab_free", s, tid); | |
3205 | goto redo; | |
3206 | } | |
84e554e6 | 3207 | stat(s, FREE_FASTPATH); |
894b8788 | 3208 | } else |
81084651 | 3209 | __slab_free(s, page, head, tail_obj, cnt, addr); |
894b8788 | 3210 | |
894b8788 CL |
3211 | } |
3212 | ||
80a9201a AP |
3213 | static __always_inline void slab_free(struct kmem_cache *s, struct page *page, |
3214 | void *head, void *tail, int cnt, | |
3215 | unsigned long addr) | |
3216 | { | |
80a9201a | 3217 | /* |
c3895391 AK |
3218 | * With KASAN enabled slab_free_freelist_hook modifies the freelist |
3219 | * to remove objects, whose reuse must be delayed. | |
80a9201a | 3220 | */ |
c3895391 AK |
3221 | if (slab_free_freelist_hook(s, &head, &tail)) |
3222 | do_slab_free(s, page, head, tail, cnt, addr); | |
80a9201a AP |
3223 | } |
3224 | ||
2bd926b4 | 3225 | #ifdef CONFIG_KASAN_GENERIC |
80a9201a AP |
3226 | void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr) |
3227 | { | |
3228 | do_slab_free(cache, virt_to_head_page(x), x, NULL, 1, addr); | |
3229 | } | |
3230 | #endif | |
3231 | ||
81819f0f CL |
3232 | void kmem_cache_free(struct kmem_cache *s, void *x) |
3233 | { | |
b9ce5ef4 GC |
3234 | s = cache_from_obj(s, x); |
3235 | if (!s) | |
79576102 | 3236 | return; |
81084651 | 3237 | slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_); |
3544de8e | 3238 | trace_kmem_cache_free(_RET_IP_, x, s->name); |
81819f0f CL |
3239 | } |
3240 | EXPORT_SYMBOL(kmem_cache_free); | |
3241 | ||
d0ecd894 | 3242 | struct detached_freelist { |
fbd02630 | 3243 | struct page *page; |
d0ecd894 JDB |
3244 | void *tail; |
3245 | void *freelist; | |
3246 | int cnt; | |
376bf125 | 3247 | struct kmem_cache *s; |
d0ecd894 | 3248 | }; |
fbd02630 | 3249 | |
d0ecd894 JDB |
3250 | /* |
3251 | * This function progressively scans the array with free objects (with | |
3252 | * a limited look ahead) and extract objects belonging to the same | |
3253 | * page. It builds a detached freelist directly within the given | |
3254 | * page/objects. This can happen without any need for | |
3255 | * synchronization, because the objects are owned by running process. | |
3256 | * The freelist is build up as a single linked list in the objects. | |
3257 | * The idea is, that this detached freelist can then be bulk | |
3258 | * transferred to the real freelist(s), but only requiring a single | |
3259 | * synchronization primitive. Look ahead in the array is limited due | |
3260 | * to performance reasons. | |
3261 | */ | |
376bf125 JDB |
3262 | static inline |
3263 | int build_detached_freelist(struct kmem_cache *s, size_t size, | |
3264 | void **p, struct detached_freelist *df) | |
d0ecd894 JDB |
3265 | { |
3266 | size_t first_skipped_index = 0; | |
3267 | int lookahead = 3; | |
3268 | void *object; | |
ca257195 | 3269 | struct page *page; |
fbd02630 | 3270 | |
d0ecd894 JDB |
3271 | /* Always re-init detached_freelist */ |
3272 | df->page = NULL; | |
fbd02630 | 3273 | |
d0ecd894 JDB |
3274 | do { |
3275 | object = p[--size]; | |
ca257195 | 3276 | /* Do we need !ZERO_OR_NULL_PTR(object) here? (for kfree) */ |
d0ecd894 | 3277 | } while (!object && size); |
3eed034d | 3278 | |
d0ecd894 JDB |
3279 | if (!object) |
3280 | return 0; | |
fbd02630 | 3281 | |
ca257195 JDB |
3282 | page = virt_to_head_page(object); |
3283 | if (!s) { | |
3284 | /* Handle kalloc'ed objects */ | |
3285 | if (unlikely(!PageSlab(page))) { | |
3286 | BUG_ON(!PageCompound(page)); | |
3287 | kfree_hook(object); | |
4949148a | 3288 | __free_pages(page, compound_order(page)); |
ca257195 JDB |
3289 | p[size] = NULL; /* mark object processed */ |
3290 | return size; | |
3291 | } | |
3292 | /* Derive kmem_cache from object */ | |
3293 | df->s = page->slab_cache; | |
3294 | } else { | |
3295 | df->s = cache_from_obj(s, object); /* Support for memcg */ | |
3296 | } | |
376bf125 | 3297 | |
b89fb5ef | 3298 | if (is_kfence_address(object)) { |
d57a964e | 3299 | slab_free_hook(df->s, object, false); |
b89fb5ef AP |
3300 | __kfence_free(object); |
3301 | p[size] = NULL; /* mark object processed */ | |
3302 | return size; | |
3303 | } | |
3304 | ||
d0ecd894 | 3305 | /* Start new detached freelist */ |
ca257195 | 3306 | df->page = page; |
376bf125 | 3307 | set_freepointer(df->s, object, NULL); |
d0ecd894 JDB |
3308 | df->tail = object; |
3309 | df->freelist = object; | |
3310 | p[size] = NULL; /* mark object processed */ | |
3311 | df->cnt = 1; | |
3312 | ||
3313 | while (size) { | |
3314 | object = p[--size]; | |
3315 | if (!object) | |
3316 | continue; /* Skip processed objects */ | |
3317 | ||
3318 | /* df->page is always set at this point */ | |
3319 | if (df->page == virt_to_head_page(object)) { | |
3320 | /* Opportunity build freelist */ | |
376bf125 | 3321 | set_freepointer(df->s, object, df->freelist); |
d0ecd894 JDB |
3322 | df->freelist = object; |
3323 | df->cnt++; | |
3324 | p[size] = NULL; /* mark object processed */ | |
3325 | ||
3326 | continue; | |
fbd02630 | 3327 | } |
d0ecd894 JDB |
3328 | |
3329 | /* Limit look ahead search */ | |
3330 | if (!--lookahead) | |
3331 | break; | |
3332 | ||
3333 | if (!first_skipped_index) | |
3334 | first_skipped_index = size + 1; | |
fbd02630 | 3335 | } |
d0ecd894 JDB |
3336 | |
3337 | return first_skipped_index; | |
3338 | } | |
3339 | ||
d0ecd894 | 3340 | /* Note that interrupts must be enabled when calling this function. */ |
376bf125 | 3341 | void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p) |
d0ecd894 JDB |
3342 | { |
3343 | if (WARN_ON(!size)) | |
3344 | return; | |
3345 | ||
d1b2cf6c | 3346 | memcg_slab_free_hook(s, p, size); |
d0ecd894 JDB |
3347 | do { |
3348 | struct detached_freelist df; | |
3349 | ||
3350 | size = build_detached_freelist(s, size, p, &df); | |
84582c8a | 3351 | if (!df.page) |
d0ecd894 JDB |
3352 | continue; |
3353 | ||
457c82c3 | 3354 | slab_free(df.s, df.page, df.freelist, df.tail, df.cnt, _RET_IP_); |
d0ecd894 | 3355 | } while (likely(size)); |
484748f0 CL |
3356 | } |
3357 | EXPORT_SYMBOL(kmem_cache_free_bulk); | |
3358 | ||
994eb764 | 3359 | /* Note that interrupts must be enabled when calling this function. */ |
865762a8 JDB |
3360 | int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, |
3361 | void **p) | |
484748f0 | 3362 | { |
994eb764 JDB |
3363 | struct kmem_cache_cpu *c; |
3364 | int i; | |
964d4bd3 | 3365 | struct obj_cgroup *objcg = NULL; |
994eb764 | 3366 | |
03ec0ed5 | 3367 | /* memcg and kmem_cache debug support */ |
964d4bd3 | 3368 | s = slab_pre_alloc_hook(s, &objcg, size, flags); |
03ec0ed5 JDB |
3369 | if (unlikely(!s)) |
3370 | return false; | |
994eb764 JDB |
3371 | /* |
3372 | * Drain objects in the per cpu slab, while disabling local | |
3373 | * IRQs, which protects against PREEMPT and interrupts | |
3374 | * handlers invoking normal fastpath. | |
3375 | */ | |
3376 | local_irq_disable(); | |
3377 | c = this_cpu_ptr(s->cpu_slab); | |
3378 | ||
3379 | for (i = 0; i < size; i++) { | |
b89fb5ef | 3380 | void *object = kfence_alloc(s, s->object_size, flags); |
994eb764 | 3381 | |
b89fb5ef AP |
3382 | if (unlikely(object)) { |
3383 | p[i] = object; | |
3384 | continue; | |
3385 | } | |
3386 | ||
3387 | object = c->freelist; | |
ebe909e0 | 3388 | if (unlikely(!object)) { |
fd4d9c7d JH |
3389 | /* |
3390 | * We may have removed an object from c->freelist using | |
3391 | * the fastpath in the previous iteration; in that case, | |
3392 | * c->tid has not been bumped yet. | |
3393 | * Since ___slab_alloc() may reenable interrupts while | |
3394 | * allocating memory, we should bump c->tid now. | |
3395 | */ | |
3396 | c->tid = next_tid(c->tid); | |
3397 | ||
ebe909e0 JDB |
3398 | /* |
3399 | * Invoking slow path likely have side-effect | |
3400 | * of re-populating per CPU c->freelist | |
3401 | */ | |
87098373 | 3402 | p[i] = ___slab_alloc(s, flags, NUMA_NO_NODE, |
ebe909e0 | 3403 | _RET_IP_, c); |
87098373 CL |
3404 | if (unlikely(!p[i])) |
3405 | goto error; | |
3406 | ||
ebe909e0 | 3407 | c = this_cpu_ptr(s->cpu_slab); |
0f181f9f AP |
3408 | maybe_wipe_obj_freeptr(s, p[i]); |
3409 | ||
ebe909e0 JDB |
3410 | continue; /* goto for-loop */ |
3411 | } | |
994eb764 JDB |
3412 | c->freelist = get_freepointer(s, object); |
3413 | p[i] = object; | |
0f181f9f | 3414 | maybe_wipe_obj_freeptr(s, p[i]); |
994eb764 JDB |
3415 | } |
3416 | c->tid = next_tid(c->tid); | |
3417 | local_irq_enable(); | |
3418 | ||
da844b78 AK |
3419 | /* |
3420 | * memcg and kmem_cache debug support and memory initialization. | |
3421 | * Done outside of the IRQ disabled fastpath loop. | |
3422 | */ | |
3423 | slab_post_alloc_hook(s, objcg, flags, size, p, | |
3424 | slab_want_init_on_alloc(flags, s)); | |
865762a8 | 3425 | return i; |
87098373 | 3426 | error: |
87098373 | 3427 | local_irq_enable(); |
da844b78 | 3428 | slab_post_alloc_hook(s, objcg, flags, i, p, false); |
03ec0ed5 | 3429 | __kmem_cache_free_bulk(s, i, p); |
865762a8 | 3430 | return 0; |
484748f0 CL |
3431 | } |
3432 | EXPORT_SYMBOL(kmem_cache_alloc_bulk); | |
3433 | ||
3434 | ||
81819f0f | 3435 | /* |
672bba3a CL |
3436 | * Object placement in a slab is made very easy because we always start at |
3437 | * offset 0. If we tune the size of the object to the alignment then we can | |
3438 | * get the required alignment by putting one properly sized object after | |
3439 | * another. | |
81819f0f CL |
3440 | * |
3441 | * Notice that the allocation order determines the sizes of the per cpu | |
3442 | * caches. Each processor has always one slab available for allocations. | |
3443 | * Increasing the allocation order reduces the number of times that slabs | |
672bba3a | 3444 | * must be moved on and off the partial lists and is therefore a factor in |
81819f0f | 3445 | * locking overhead. |
81819f0f CL |
3446 | */ |
3447 | ||
3448 | /* | |
f0953a1b | 3449 | * Minimum / Maximum order of slab pages. This influences locking overhead |
81819f0f CL |
3450 | * and slab fragmentation. A higher order reduces the number of partial slabs |
3451 | * and increases the number of allocations possible without having to | |
3452 | * take the list_lock. | |
3453 | */ | |
19af27af AD |
3454 | static unsigned int slub_min_order; |
3455 | static unsigned int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; | |
3456 | static unsigned int slub_min_objects; | |
81819f0f | 3457 | |
81819f0f CL |
3458 | /* |
3459 | * Calculate the order of allocation given an slab object size. | |
3460 | * | |
672bba3a CL |
3461 | * The order of allocation has significant impact on performance and other |
3462 | * system components. Generally order 0 allocations should be preferred since | |
3463 | * order 0 does not cause fragmentation in the page allocator. Larger objects | |
3464 | * be problematic to put into order 0 slabs because there may be too much | |
c124f5b5 | 3465 | * unused space left. We go to a higher order if more than 1/16th of the slab |
672bba3a CL |
3466 | * would be wasted. |
3467 | * | |
3468 | * In order to reach satisfactory performance we must ensure that a minimum | |
3469 | * number of objects is in one slab. Otherwise we may generate too much | |
3470 | * activity on the partial lists which requires taking the list_lock. This is | |
3471 | * less a concern for large slabs though which are rarely used. | |
81819f0f | 3472 | * |
672bba3a CL |
3473 | * slub_max_order specifies the order where we begin to stop considering the |
3474 | * number of objects in a slab as critical. If we reach slub_max_order then | |
3475 | * we try to keep the page order as low as possible. So we accept more waste | |
3476 | * of space in favor of a small page order. | |
81819f0f | 3477 | * |
672bba3a CL |
3478 | * Higher order allocations also allow the placement of more objects in a |
3479 | * slab and thereby reduce object handling overhead. If the user has | |
dc84207d | 3480 | * requested a higher minimum order then we start with that one instead of |
672bba3a | 3481 | * the smallest order which will fit the object. |
81819f0f | 3482 | */ |
19af27af AD |
3483 | static inline unsigned int slab_order(unsigned int size, |
3484 | unsigned int min_objects, unsigned int max_order, | |
9736d2a9 | 3485 | unsigned int fract_leftover) |
81819f0f | 3486 | { |
19af27af AD |
3487 | unsigned int min_order = slub_min_order; |
3488 | unsigned int order; | |
81819f0f | 3489 | |
9736d2a9 | 3490 | if (order_objects(min_order, size) > MAX_OBJS_PER_PAGE) |
210b5c06 | 3491 | return get_order(size * MAX_OBJS_PER_PAGE) - 1; |
39b26464 | 3492 | |
9736d2a9 | 3493 | for (order = max(min_order, (unsigned int)get_order(min_objects * size)); |
5e6d444e | 3494 | order <= max_order; order++) { |
81819f0f | 3495 | |
19af27af AD |
3496 | unsigned int slab_size = (unsigned int)PAGE_SIZE << order; |
3497 | unsigned int rem; | |
81819f0f | 3498 | |
9736d2a9 | 3499 | rem = slab_size % size; |
81819f0f | 3500 | |
5e6d444e | 3501 | if (rem <= slab_size / fract_leftover) |
81819f0f | 3502 | break; |
81819f0f | 3503 | } |
672bba3a | 3504 | |
81819f0f CL |
3505 | return order; |
3506 | } | |
3507 | ||
9736d2a9 | 3508 | static inline int calculate_order(unsigned int size) |
5e6d444e | 3509 | { |
19af27af AD |
3510 | unsigned int order; |
3511 | unsigned int min_objects; | |
3512 | unsigned int max_objects; | |
3286222f | 3513 | unsigned int nr_cpus; |
5e6d444e CL |
3514 | |
3515 | /* | |
3516 | * Attempt to find best configuration for a slab. This | |
3517 | * works by first attempting to generate a layout with | |
3518 | * the best configuration and backing off gradually. | |
3519 | * | |
422ff4d7 | 3520 | * First we increase the acceptable waste in a slab. Then |
5e6d444e CL |
3521 | * we reduce the minimum objects required in a slab. |
3522 | */ | |
3523 | min_objects = slub_min_objects; | |
3286222f VB |
3524 | if (!min_objects) { |
3525 | /* | |
3526 | * Some architectures will only update present cpus when | |
3527 | * onlining them, so don't trust the number if it's just 1. But | |
3528 | * we also don't want to use nr_cpu_ids always, as on some other | |
3529 | * architectures, there can be many possible cpus, but never | |
3530 | * onlined. Here we compromise between trying to avoid too high | |
3531 | * order on systems that appear larger than they are, and too | |
3532 | * low order on systems that appear smaller than they are. | |
3533 | */ | |
3534 | nr_cpus = num_present_cpus(); | |
3535 | if (nr_cpus <= 1) | |
3536 | nr_cpus = nr_cpu_ids; | |
3537 | min_objects = 4 * (fls(nr_cpus) + 1); | |
3538 | } | |
9736d2a9 | 3539 | max_objects = order_objects(slub_max_order, size); |
e8120ff1 ZY |
3540 | min_objects = min(min_objects, max_objects); |
3541 | ||
5e6d444e | 3542 | while (min_objects > 1) { |
19af27af AD |
3543 | unsigned int fraction; |
3544 | ||
c124f5b5 | 3545 | fraction = 16; |
5e6d444e CL |
3546 | while (fraction >= 4) { |
3547 | order = slab_order(size, min_objects, | |
9736d2a9 | 3548 | slub_max_order, fraction); |
5e6d444e CL |
3549 | if (order <= slub_max_order) |
3550 | return order; | |
3551 | fraction /= 2; | |
3552 | } | |
5086c389 | 3553 | min_objects--; |
5e6d444e CL |
3554 | } |
3555 | ||
3556 | /* | |
3557 | * We were unable to place multiple objects in a slab. Now | |
3558 | * lets see if we can place a single object there. | |
3559 | */ | |
9736d2a9 | 3560 | order = slab_order(size, 1, slub_max_order, 1); |
5e6d444e CL |
3561 | if (order <= slub_max_order) |
3562 | return order; | |
3563 | ||
3564 | /* | |
3565 | * Doh this slab cannot be placed using slub_max_order. | |
3566 | */ | |
9736d2a9 | 3567 | order = slab_order(size, 1, MAX_ORDER, 1); |
818cf590 | 3568 | if (order < MAX_ORDER) |
5e6d444e CL |
3569 | return order; |
3570 | return -ENOSYS; | |
3571 | } | |
3572 | ||
5595cffc | 3573 | static void |
4053497d | 3574 | init_kmem_cache_node(struct kmem_cache_node *n) |
81819f0f CL |
3575 | { |
3576 | n->nr_partial = 0; | |
81819f0f CL |
3577 | spin_lock_init(&n->list_lock); |
3578 | INIT_LIST_HEAD(&n->partial); | |
8ab1372f | 3579 | #ifdef CONFIG_SLUB_DEBUG |
0f389ec6 | 3580 | atomic_long_set(&n->nr_slabs, 0); |
02b71b70 | 3581 | atomic_long_set(&n->total_objects, 0); |
643b1138 | 3582 | INIT_LIST_HEAD(&n->full); |
8ab1372f | 3583 | #endif |
81819f0f CL |
3584 | } |
3585 | ||
55136592 | 3586 | static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) |
4c93c355 | 3587 | { |
6c182dc0 | 3588 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < |
95a05b42 | 3589 | KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu)); |
4c93c355 | 3590 | |
8a5ec0ba | 3591 | /* |
d4d84fef CM |
3592 | * Must align to double word boundary for the double cmpxchg |
3593 | * instructions to work; see __pcpu_double_call_return_bool(). | |
8a5ec0ba | 3594 | */ |
d4d84fef CM |
3595 | s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), |
3596 | 2 * sizeof(void *)); | |
8a5ec0ba CL |
3597 | |
3598 | if (!s->cpu_slab) | |
3599 | return 0; | |
3600 | ||
3601 | init_kmem_cache_cpus(s); | |
4c93c355 | 3602 | |
8a5ec0ba | 3603 | return 1; |
4c93c355 | 3604 | } |
4c93c355 | 3605 | |
51df1142 CL |
3606 | static struct kmem_cache *kmem_cache_node; |
3607 | ||
81819f0f CL |
3608 | /* |
3609 | * No kmalloc_node yet so do it by hand. We know that this is the first | |
3610 | * slab on the node for this slabcache. There are no concurrent accesses | |
3611 | * possible. | |
3612 | * | |
721ae22a ZYW |
3613 | * Note that this function only works on the kmem_cache_node |
3614 | * when allocating for the kmem_cache_node. This is used for bootstrapping | |
4c93c355 | 3615 | * memory on a fresh node that has no slab structures yet. |
81819f0f | 3616 | */ |
55136592 | 3617 | static void early_kmem_cache_node_alloc(int node) |
81819f0f CL |
3618 | { |
3619 | struct page *page; | |
3620 | struct kmem_cache_node *n; | |
3621 | ||
51df1142 | 3622 | BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node)); |
81819f0f | 3623 | |
51df1142 | 3624 | page = new_slab(kmem_cache_node, GFP_NOWAIT, node); |
81819f0f CL |
3625 | |
3626 | BUG_ON(!page); | |
a2f92ee7 | 3627 | if (page_to_nid(page) != node) { |
f9f58285 FF |
3628 | pr_err("SLUB: Unable to allocate memory from node %d\n", node); |
3629 | pr_err("SLUB: Allocating a useless per node structure in order to be able to continue\n"); | |
a2f92ee7 CL |
3630 | } |
3631 | ||
81819f0f CL |
3632 | n = page->freelist; |
3633 | BUG_ON(!n); | |
8ab1372f | 3634 | #ifdef CONFIG_SLUB_DEBUG |
f7cb1933 | 3635 | init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); |
51df1142 | 3636 | init_tracking(kmem_cache_node, n); |
8ab1372f | 3637 | #endif |
da844b78 | 3638 | n = kasan_slab_alloc(kmem_cache_node, n, GFP_KERNEL, false); |
12b22386 AK |
3639 | page->freelist = get_freepointer(kmem_cache_node, n); |
3640 | page->inuse = 1; | |
3641 | page->frozen = 0; | |
3642 | kmem_cache_node->node[node] = n; | |
4053497d | 3643 | init_kmem_cache_node(n); |
51df1142 | 3644 | inc_slabs_node(kmem_cache_node, node, page->objects); |
6446faa2 | 3645 | |
67b6c900 | 3646 | /* |
1e4dd946 SR |
3647 | * No locks need to be taken here as it has just been |
3648 | * initialized and there is no concurrent access. | |
67b6c900 | 3649 | */ |
1e4dd946 | 3650 | __add_partial(n, page, DEACTIVATE_TO_HEAD); |
81819f0f CL |
3651 | } |
3652 | ||
3653 | static void free_kmem_cache_nodes(struct kmem_cache *s) | |
3654 | { | |
3655 | int node; | |
fa45dc25 | 3656 | struct kmem_cache_node *n; |
81819f0f | 3657 | |
fa45dc25 | 3658 | for_each_kmem_cache_node(s, node, n) { |
81819f0f | 3659 | s->node[node] = NULL; |
ea37df54 | 3660 | kmem_cache_free(kmem_cache_node, n); |
81819f0f CL |
3661 | } |
3662 | } | |
3663 | ||
52b4b950 DS |
3664 | void __kmem_cache_release(struct kmem_cache *s) |
3665 | { | |
210e7a43 | 3666 | cache_random_seq_destroy(s); |
52b4b950 DS |
3667 | free_percpu(s->cpu_slab); |
3668 | free_kmem_cache_nodes(s); | |
3669 | } | |
3670 | ||
55136592 | 3671 | static int init_kmem_cache_nodes(struct kmem_cache *s) |
81819f0f CL |
3672 | { |
3673 | int node; | |
81819f0f | 3674 | |
7e1fa93d | 3675 | for_each_node_mask(node, slab_nodes) { |
81819f0f CL |
3676 | struct kmem_cache_node *n; |
3677 | ||
73367bd8 | 3678 | if (slab_state == DOWN) { |
55136592 | 3679 | early_kmem_cache_node_alloc(node); |
73367bd8 AD |
3680 | continue; |
3681 | } | |
51df1142 | 3682 | n = kmem_cache_alloc_node(kmem_cache_node, |
55136592 | 3683 | GFP_KERNEL, node); |
81819f0f | 3684 | |
73367bd8 AD |
3685 | if (!n) { |
3686 | free_kmem_cache_nodes(s); | |
3687 | return 0; | |
81819f0f | 3688 | } |
73367bd8 | 3689 | |
4053497d | 3690 | init_kmem_cache_node(n); |
ea37df54 | 3691 | s->node[node] = n; |
81819f0f CL |
3692 | } |
3693 | return 1; | |
3694 | } | |
81819f0f | 3695 | |
c0bdb232 | 3696 | static void set_min_partial(struct kmem_cache *s, unsigned long min) |
3b89d7d8 DR |
3697 | { |
3698 | if (min < MIN_PARTIAL) | |
3699 | min = MIN_PARTIAL; | |
3700 | else if (min > MAX_PARTIAL) | |
3701 | min = MAX_PARTIAL; | |
3702 | s->min_partial = min; | |
3703 | } | |
3704 | ||
e6d0e1dc WY |
3705 | static void set_cpu_partial(struct kmem_cache *s) |
3706 | { | |
3707 | #ifdef CONFIG_SLUB_CPU_PARTIAL | |
3708 | /* | |
3709 | * cpu_partial determined the maximum number of objects kept in the | |
3710 | * per cpu partial lists of a processor. | |
3711 | * | |
3712 | * Per cpu partial lists mainly contain slabs that just have one | |
3713 | * object freed. If they are used for allocation then they can be | |
3714 | * filled up again with minimal effort. The slab will never hit the | |
3715 | * per node partial lists and therefore no locking will be required. | |
3716 | * | |
3717 | * This setting also determines | |
3718 | * | |
3719 | * A) The number of objects from per cpu partial slabs dumped to the | |
3720 | * per node list when we reach the limit. | |
3721 | * B) The number of objects in cpu partial slabs to extract from the | |
3722 | * per node list when we run out of per cpu objects. We only fetch | |
3723 | * 50% to keep some capacity around for frees. | |
3724 | */ | |
3725 | if (!kmem_cache_has_cpu_partial(s)) | |
bbd4e305 | 3726 | slub_set_cpu_partial(s, 0); |
e6d0e1dc | 3727 | else if (s->size >= PAGE_SIZE) |
bbd4e305 | 3728 | slub_set_cpu_partial(s, 2); |
e6d0e1dc | 3729 | else if (s->size >= 1024) |
bbd4e305 | 3730 | slub_set_cpu_partial(s, 6); |
e6d0e1dc | 3731 | else if (s->size >= 256) |
bbd4e305 | 3732 | slub_set_cpu_partial(s, 13); |
e6d0e1dc | 3733 | else |
bbd4e305 | 3734 | slub_set_cpu_partial(s, 30); |
e6d0e1dc WY |
3735 | #endif |
3736 | } | |
3737 | ||
81819f0f CL |
3738 | /* |
3739 | * calculate_sizes() determines the order and the distribution of data within | |
3740 | * a slab object. | |
3741 | */ | |
06b285dc | 3742 | static int calculate_sizes(struct kmem_cache *s, int forced_order) |
81819f0f | 3743 | { |
d50112ed | 3744 | slab_flags_t flags = s->flags; |
be4a7988 | 3745 | unsigned int size = s->object_size; |
19af27af | 3746 | unsigned int order; |
81819f0f | 3747 | |
d8b42bf5 CL |
3748 | /* |
3749 | * Round up object size to the next word boundary. We can only | |
3750 | * place the free pointer at word boundaries and this determines | |
3751 | * the possible location of the free pointer. | |
3752 | */ | |
3753 | size = ALIGN(size, sizeof(void *)); | |
3754 | ||
3755 | #ifdef CONFIG_SLUB_DEBUG | |
81819f0f CL |
3756 | /* |
3757 | * Determine if we can poison the object itself. If the user of | |
3758 | * the slab may touch the object after free or before allocation | |
3759 | * then we should never poison the object itself. | |
3760 | */ | |
5f0d5a3a | 3761 | if ((flags & SLAB_POISON) && !(flags & SLAB_TYPESAFE_BY_RCU) && |
c59def9f | 3762 | !s->ctor) |
81819f0f CL |
3763 | s->flags |= __OBJECT_POISON; |
3764 | else | |
3765 | s->flags &= ~__OBJECT_POISON; | |
3766 | ||
81819f0f CL |
3767 | |
3768 | /* | |
672bba3a | 3769 | * If we are Redzoning then check if there is some space between the |
81819f0f | 3770 | * end of the object and the free pointer. If not then add an |
672bba3a | 3771 | * additional word to have some bytes to store Redzone information. |
81819f0f | 3772 | */ |
3b0efdfa | 3773 | if ((flags & SLAB_RED_ZONE) && size == s->object_size) |
81819f0f | 3774 | size += sizeof(void *); |
41ecc55b | 3775 | #endif |
81819f0f CL |
3776 | |
3777 | /* | |
672bba3a | 3778 | * With that we have determined the number of bytes in actual use |
e41a49fa | 3779 | * by the object and redzoning. |
81819f0f CL |
3780 | */ |
3781 | s->inuse = size; | |
3782 | ||
74c1d3e0 KC |
3783 | if ((flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) || |
3784 | ((flags & SLAB_RED_ZONE) && s->object_size < sizeof(void *)) || | |
3785 | s->ctor) { | |
81819f0f CL |
3786 | /* |
3787 | * Relocate free pointer after the object if it is not | |
3788 | * permitted to overwrite the first word of the object on | |
3789 | * kmem_cache_free. | |
3790 | * | |
3791 | * This is the case if we do RCU, have a constructor or | |
74c1d3e0 KC |
3792 | * destructor, are poisoning the objects, or are |
3793 | * redzoning an object smaller than sizeof(void *). | |
cbfc35a4 WL |
3794 | * |
3795 | * The assumption that s->offset >= s->inuse means free | |
3796 | * pointer is outside of the object is used in the | |
3797 | * freeptr_outside_object() function. If that is no | |
3798 | * longer true, the function needs to be modified. | |
81819f0f CL |
3799 | */ |
3800 | s->offset = size; | |
3801 | size += sizeof(void *); | |
e41a49fa | 3802 | } else { |
3202fa62 KC |
3803 | /* |
3804 | * Store freelist pointer near middle of object to keep | |
3805 | * it away from the edges of the object to avoid small | |
3806 | * sized over/underflows from neighboring allocations. | |
3807 | */ | |
e41a49fa | 3808 | s->offset = ALIGN_DOWN(s->object_size / 2, sizeof(void *)); |
81819f0f CL |
3809 | } |
3810 | ||
c12b3c62 | 3811 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f CL |
3812 | if (flags & SLAB_STORE_USER) |
3813 | /* | |
3814 | * Need to store information about allocs and frees after | |
3815 | * the object. | |
3816 | */ | |
3817 | size += 2 * sizeof(struct track); | |
80a9201a | 3818 | #endif |
81819f0f | 3819 | |
80a9201a AP |
3820 | kasan_cache_create(s, &size, &s->flags); |
3821 | #ifdef CONFIG_SLUB_DEBUG | |
d86bd1be | 3822 | if (flags & SLAB_RED_ZONE) { |
81819f0f CL |
3823 | /* |
3824 | * Add some empty padding so that we can catch | |
3825 | * overwrites from earlier objects rather than let | |
3826 | * tracking information or the free pointer be | |
0211a9c8 | 3827 | * corrupted if a user writes before the start |
81819f0f CL |
3828 | * of the object. |
3829 | */ | |
3830 | size += sizeof(void *); | |
d86bd1be JK |
3831 | |
3832 | s->red_left_pad = sizeof(void *); | |
3833 | s->red_left_pad = ALIGN(s->red_left_pad, s->align); | |
3834 | size += s->red_left_pad; | |
3835 | } | |
41ecc55b | 3836 | #endif |
672bba3a | 3837 | |
81819f0f CL |
3838 | /* |
3839 | * SLUB stores one object immediately after another beginning from | |
3840 | * offset 0. In order to align the objects we have to simply size | |
3841 | * each object to conform to the alignment. | |
3842 | */ | |
45906855 | 3843 | size = ALIGN(size, s->align); |
81819f0f | 3844 | s->size = size; |
4138fdfc | 3845 | s->reciprocal_size = reciprocal_value(size); |
06b285dc CL |
3846 | if (forced_order >= 0) |
3847 | order = forced_order; | |
3848 | else | |
9736d2a9 | 3849 | order = calculate_order(size); |
81819f0f | 3850 | |
19af27af | 3851 | if ((int)order < 0) |
81819f0f CL |
3852 | return 0; |
3853 | ||
b7a49f0d | 3854 | s->allocflags = 0; |
834f3d11 | 3855 | if (order) |
b7a49f0d CL |
3856 | s->allocflags |= __GFP_COMP; |
3857 | ||
3858 | if (s->flags & SLAB_CACHE_DMA) | |
2c59dd65 | 3859 | s->allocflags |= GFP_DMA; |
b7a49f0d | 3860 | |
6d6ea1e9 NB |
3861 | if (s->flags & SLAB_CACHE_DMA32) |
3862 | s->allocflags |= GFP_DMA32; | |
3863 | ||
b7a49f0d CL |
3864 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
3865 | s->allocflags |= __GFP_RECLAIMABLE; | |
3866 | ||
81819f0f CL |
3867 | /* |
3868 | * Determine the number of objects per slab | |
3869 | */ | |
9736d2a9 MW |
3870 | s->oo = oo_make(order, size); |
3871 | s->min = oo_make(get_order(size), size); | |
205ab99d CL |
3872 | if (oo_objects(s->oo) > oo_objects(s->max)) |
3873 | s->max = s->oo; | |
81819f0f | 3874 | |
834f3d11 | 3875 | return !!oo_objects(s->oo); |
81819f0f CL |
3876 | } |
3877 | ||
d50112ed | 3878 | static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags) |
81819f0f | 3879 | { |
37540008 | 3880 | s->flags = kmem_cache_flags(s->size, flags, s->name); |
2482ddec KC |
3881 | #ifdef CONFIG_SLAB_FREELIST_HARDENED |
3882 | s->random = get_random_long(); | |
3883 | #endif | |
81819f0f | 3884 | |
06b285dc | 3885 | if (!calculate_sizes(s, -1)) |
81819f0f | 3886 | goto error; |
3de47213 DR |
3887 | if (disable_higher_order_debug) { |
3888 | /* | |
3889 | * Disable debugging flags that store metadata if the min slab | |
3890 | * order increased. | |
3891 | */ | |
3b0efdfa | 3892 | if (get_order(s->size) > get_order(s->object_size)) { |
3de47213 DR |
3893 | s->flags &= ~DEBUG_METADATA_FLAGS; |
3894 | s->offset = 0; | |
3895 | if (!calculate_sizes(s, -1)) | |
3896 | goto error; | |
3897 | } | |
3898 | } | |
81819f0f | 3899 | |
2565409f HC |
3900 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
3901 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
149daaf3 | 3902 | if (system_has_cmpxchg_double() && (s->flags & SLAB_NO_CMPXCHG) == 0) |
b789ef51 CL |
3903 | /* Enable fast mode */ |
3904 | s->flags |= __CMPXCHG_DOUBLE; | |
3905 | #endif | |
3906 | ||
3b89d7d8 DR |
3907 | /* |
3908 | * The larger the object size is, the more pages we want on the partial | |
3909 | * list to avoid pounding the page allocator excessively. | |
3910 | */ | |
49e22585 CL |
3911 | set_min_partial(s, ilog2(s->size) / 2); |
3912 | ||
e6d0e1dc | 3913 | set_cpu_partial(s); |
49e22585 | 3914 | |
81819f0f | 3915 | #ifdef CONFIG_NUMA |
e2cb96b7 | 3916 | s->remote_node_defrag_ratio = 1000; |
81819f0f | 3917 | #endif |
210e7a43 TG |
3918 | |
3919 | /* Initialize the pre-computed randomized freelist if slab is up */ | |
3920 | if (slab_state >= UP) { | |
3921 | if (init_cache_random_seq(s)) | |
3922 | goto error; | |
3923 | } | |
3924 | ||
55136592 | 3925 | if (!init_kmem_cache_nodes(s)) |
dfb4f096 | 3926 | goto error; |
81819f0f | 3927 | |
55136592 | 3928 | if (alloc_kmem_cache_cpus(s)) |
278b1bb1 | 3929 | return 0; |
ff12059e | 3930 | |
4c93c355 | 3931 | free_kmem_cache_nodes(s); |
81819f0f | 3932 | error: |
278b1bb1 | 3933 | return -EINVAL; |
81819f0f | 3934 | } |
81819f0f | 3935 | |
33b12c38 | 3936 | static void list_slab_objects(struct kmem_cache *s, struct page *page, |
55860d96 | 3937 | const char *text) |
33b12c38 CL |
3938 | { |
3939 | #ifdef CONFIG_SLUB_DEBUG | |
3940 | void *addr = page_address(page); | |
55860d96 | 3941 | unsigned long *map; |
33b12c38 | 3942 | void *p; |
aa456c7a | 3943 | |
945cf2b6 | 3944 | slab_err(s, page, text, s->name); |
33b12c38 | 3945 | slab_lock(page); |
33b12c38 | 3946 | |
90e9f6a6 | 3947 | map = get_map(s, page); |
33b12c38 CL |
3948 | for_each_object(p, s, addr, page->objects) { |
3949 | ||
4138fdfc | 3950 | if (!test_bit(__obj_to_index(s, addr, p), map)) { |
96b94abc | 3951 | pr_err("Object 0x%p @offset=%tu\n", p, p - addr); |
33b12c38 CL |
3952 | print_tracking(s, p); |
3953 | } | |
3954 | } | |
55860d96 | 3955 | put_map(map); |
33b12c38 CL |
3956 | slab_unlock(page); |
3957 | #endif | |
3958 | } | |
3959 | ||
81819f0f | 3960 | /* |
599870b1 | 3961 | * Attempt to free all partial slabs on a node. |
52b4b950 DS |
3962 | * This is called from __kmem_cache_shutdown(). We must take list_lock |
3963 | * because sysfs file might still access partial list after the shutdowning. | |
81819f0f | 3964 | */ |
599870b1 | 3965 | static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) |
81819f0f | 3966 | { |
60398923 | 3967 | LIST_HEAD(discard); |
81819f0f CL |
3968 | struct page *page, *h; |
3969 | ||
52b4b950 DS |
3970 | BUG_ON(irqs_disabled()); |
3971 | spin_lock_irq(&n->list_lock); | |
916ac052 | 3972 | list_for_each_entry_safe(page, h, &n->partial, slab_list) { |
81819f0f | 3973 | if (!page->inuse) { |
52b4b950 | 3974 | remove_partial(n, page); |
916ac052 | 3975 | list_add(&page->slab_list, &discard); |
33b12c38 CL |
3976 | } else { |
3977 | list_slab_objects(s, page, | |
55860d96 | 3978 | "Objects remaining in %s on __kmem_cache_shutdown()"); |
599870b1 | 3979 | } |
33b12c38 | 3980 | } |
52b4b950 | 3981 | spin_unlock_irq(&n->list_lock); |
60398923 | 3982 | |
916ac052 | 3983 | list_for_each_entry_safe(page, h, &discard, slab_list) |
60398923 | 3984 | discard_slab(s, page); |
81819f0f CL |
3985 | } |
3986 | ||
f9e13c0a SB |
3987 | bool __kmem_cache_empty(struct kmem_cache *s) |
3988 | { | |
3989 | int node; | |
3990 | struct kmem_cache_node *n; | |
3991 | ||
3992 | for_each_kmem_cache_node(s, node, n) | |
3993 | if (n->nr_partial || slabs_node(s, node)) | |
3994 | return false; | |
3995 | return true; | |
3996 | } | |
3997 | ||
81819f0f | 3998 | /* |
672bba3a | 3999 | * Release all resources used by a slab cache. |
81819f0f | 4000 | */ |
52b4b950 | 4001 | int __kmem_cache_shutdown(struct kmem_cache *s) |
81819f0f CL |
4002 | { |
4003 | int node; | |
fa45dc25 | 4004 | struct kmem_cache_node *n; |
81819f0f CL |
4005 | |
4006 | flush_all(s); | |
81819f0f | 4007 | /* Attempt to free all objects */ |
fa45dc25 | 4008 | for_each_kmem_cache_node(s, node, n) { |
599870b1 CL |
4009 | free_partial(s, n); |
4010 | if (n->nr_partial || slabs_node(s, node)) | |
81819f0f CL |
4011 | return 1; |
4012 | } | |
81819f0f CL |
4013 | return 0; |
4014 | } | |
4015 | ||
5bb1bb35 | 4016 | #ifdef CONFIG_PRINTK |
8e7f37f2 PM |
4017 | void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page) |
4018 | { | |
4019 | void *base; | |
4020 | int __maybe_unused i; | |
4021 | unsigned int objnr; | |
4022 | void *objp; | |
4023 | void *objp0; | |
4024 | struct kmem_cache *s = page->slab_cache; | |
4025 | struct track __maybe_unused *trackp; | |
4026 | ||
4027 | kpp->kp_ptr = object; | |
4028 | kpp->kp_page = page; | |
4029 | kpp->kp_slab_cache = s; | |
4030 | base = page_address(page); | |
4031 | objp0 = kasan_reset_tag(object); | |
4032 | #ifdef CONFIG_SLUB_DEBUG | |
4033 | objp = restore_red_left(s, objp0); | |
4034 | #else | |
4035 | objp = objp0; | |
4036 | #endif | |
4037 | objnr = obj_to_index(s, page, objp); | |
4038 | kpp->kp_data_offset = (unsigned long)((char *)objp0 - (char *)objp); | |
4039 | objp = base + s->size * objnr; | |
4040 | kpp->kp_objp = objp; | |
4041 | if (WARN_ON_ONCE(objp < base || objp >= base + page->objects * s->size || (objp - base) % s->size) || | |
4042 | !(s->flags & SLAB_STORE_USER)) | |
4043 | return; | |
4044 | #ifdef CONFIG_SLUB_DEBUG | |
0cbc124b | 4045 | objp = fixup_red_left(s, objp); |
8e7f37f2 PM |
4046 | trackp = get_track(s, objp, TRACK_ALLOC); |
4047 | kpp->kp_ret = (void *)trackp->addr; | |
78869146 OG |
4048 | #ifdef CONFIG_STACKDEPOT |
4049 | { | |
4050 | depot_stack_handle_t handle; | |
4051 | unsigned long *entries; | |
4052 | unsigned int nr_entries; | |
e548eaa1 | 4053 | |
78869146 OG |
4054 | handle = READ_ONCE(trackp->handle); |
4055 | if (handle) { | |
4056 | nr_entries = stack_depot_fetch(handle, &entries); | |
4057 | for (i = 0; i < KS_ADDRS_COUNT && i < nr_entries; i++) | |
4058 | kpp->kp_stack[i] = (void *)entries[i]; | |
4059 | } | |
4060 | ||
4061 | trackp = get_track(s, objp, TRACK_FREE); | |
4062 | handle = READ_ONCE(trackp->handle); | |
4063 | if (handle) { | |
4064 | nr_entries = stack_depot_fetch(handle, &entries); | |
4065 | for (i = 0; i < KS_ADDRS_COUNT && i < nr_entries; i++) | |
4066 | kpp->kp_free_stack[i] = (void *)entries[i]; | |
4067 | } | |
e548eaa1 | 4068 | } |
8e7f37f2 PM |
4069 | #endif |
4070 | #endif | |
4071 | } | |
5bb1bb35 | 4072 | #endif |
8e7f37f2 | 4073 | |
81819f0f CL |
4074 | /******************************************************************** |
4075 | * Kmalloc subsystem | |
4076 | *******************************************************************/ | |
4077 | ||
81819f0f CL |
4078 | static int __init setup_slub_min_order(char *str) |
4079 | { | |
19af27af | 4080 | get_option(&str, (int *)&slub_min_order); |
81819f0f CL |
4081 | |
4082 | return 1; | |
4083 | } | |
4084 | ||
4085 | __setup("slub_min_order=", setup_slub_min_order); | |
4086 | ||
4087 | static int __init setup_slub_max_order(char *str) | |
4088 | { | |
19af27af AD |
4089 | get_option(&str, (int *)&slub_max_order); |
4090 | slub_max_order = min(slub_max_order, (unsigned int)MAX_ORDER - 1); | |
81819f0f CL |
4091 | |
4092 | return 1; | |
4093 | } | |
4094 | ||
4095 | __setup("slub_max_order=", setup_slub_max_order); | |
4096 | ||
4097 | static int __init setup_slub_min_objects(char *str) | |
4098 | { | |
19af27af | 4099 | get_option(&str, (int *)&slub_min_objects); |
81819f0f CL |
4100 | |
4101 | return 1; | |
4102 | } | |
4103 | ||
4104 | __setup("slub_min_objects=", setup_slub_min_objects); | |
4105 | ||
81819f0f CL |
4106 | void *__kmalloc(size_t size, gfp_t flags) |
4107 | { | |
aadb4bc4 | 4108 | struct kmem_cache *s; |
5b882be4 | 4109 | void *ret; |
81819f0f | 4110 | |
95a05b42 | 4111 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
eada35ef | 4112 | return kmalloc_large(size, flags); |
aadb4bc4 | 4113 | |
2c59dd65 | 4114 | s = kmalloc_slab(size, flags); |
aadb4bc4 CL |
4115 | |
4116 | if (unlikely(ZERO_OR_NULL_PTR(s))) | |
6cb8f913 CL |
4117 | return s; |
4118 | ||
b89fb5ef | 4119 | ret = slab_alloc(s, flags, _RET_IP_, size); |
5b882be4 | 4120 | |
ca2b84cb | 4121 | trace_kmalloc(_RET_IP_, ret, size, s->size, flags); |
5b882be4 | 4122 | |
0116523c | 4123 | ret = kasan_kmalloc(s, ret, size, flags); |
0316bec2 | 4124 | |
5b882be4 | 4125 | return ret; |
81819f0f CL |
4126 | } |
4127 | EXPORT_SYMBOL(__kmalloc); | |
4128 | ||
5d1f57e4 | 4129 | #ifdef CONFIG_NUMA |
f619cfe1 CL |
4130 | static void *kmalloc_large_node(size_t size, gfp_t flags, int node) |
4131 | { | |
b1eeab67 | 4132 | struct page *page; |
e4f7c0b4 | 4133 | void *ptr = NULL; |
6a486c0a | 4134 | unsigned int order = get_order(size); |
f619cfe1 | 4135 | |
75f296d9 | 4136 | flags |= __GFP_COMP; |
6a486c0a VB |
4137 | page = alloc_pages_node(node, flags, order); |
4138 | if (page) { | |
e4f7c0b4 | 4139 | ptr = page_address(page); |
96403bfe MS |
4140 | mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B, |
4141 | PAGE_SIZE << order); | |
6a486c0a | 4142 | } |
e4f7c0b4 | 4143 | |
0116523c | 4144 | return kmalloc_large_node_hook(ptr, size, flags); |
f619cfe1 CL |
4145 | } |
4146 | ||
81819f0f CL |
4147 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
4148 | { | |
aadb4bc4 | 4149 | struct kmem_cache *s; |
5b882be4 | 4150 | void *ret; |
81819f0f | 4151 | |
95a05b42 | 4152 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
5b882be4 EGM |
4153 | ret = kmalloc_large_node(size, flags, node); |
4154 | ||
ca2b84cb EGM |
4155 | trace_kmalloc_node(_RET_IP_, ret, |
4156 | size, PAGE_SIZE << get_order(size), | |
4157 | flags, node); | |
5b882be4 EGM |
4158 | |
4159 | return ret; | |
4160 | } | |
aadb4bc4 | 4161 | |
2c59dd65 | 4162 | s = kmalloc_slab(size, flags); |
aadb4bc4 CL |
4163 | |
4164 | if (unlikely(ZERO_OR_NULL_PTR(s))) | |
6cb8f913 CL |
4165 | return s; |
4166 | ||
b89fb5ef | 4167 | ret = slab_alloc_node(s, flags, node, _RET_IP_, size); |
5b882be4 | 4168 | |
ca2b84cb | 4169 | trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); |
5b882be4 | 4170 | |
0116523c | 4171 | ret = kasan_kmalloc(s, ret, size, flags); |
0316bec2 | 4172 | |
5b882be4 | 4173 | return ret; |
81819f0f CL |
4174 | } |
4175 | EXPORT_SYMBOL(__kmalloc_node); | |
6dfd1b65 | 4176 | #endif /* CONFIG_NUMA */ |
81819f0f | 4177 | |
ed18adc1 KC |
4178 | #ifdef CONFIG_HARDENED_USERCOPY |
4179 | /* | |
afcc90f8 KC |
4180 | * Rejects incorrectly sized objects and objects that are to be copied |
4181 | * to/from userspace but do not fall entirely within the containing slab | |
4182 | * cache's usercopy region. | |
ed18adc1 KC |
4183 | * |
4184 | * Returns NULL if check passes, otherwise const char * to name of cache | |
4185 | * to indicate an error. | |
4186 | */ | |
f4e6e289 KC |
4187 | void __check_heap_object(const void *ptr, unsigned long n, struct page *page, |
4188 | bool to_user) | |
ed18adc1 KC |
4189 | { |
4190 | struct kmem_cache *s; | |
44065b2e | 4191 | unsigned int offset; |
ed18adc1 | 4192 | size_t object_size; |
b89fb5ef | 4193 | bool is_kfence = is_kfence_address(ptr); |
ed18adc1 | 4194 | |
96fedce2 AK |
4195 | ptr = kasan_reset_tag(ptr); |
4196 | ||
ed18adc1 KC |
4197 | /* Find object and usable object size. */ |
4198 | s = page->slab_cache; | |
ed18adc1 KC |
4199 | |
4200 | /* Reject impossible pointers. */ | |
4201 | if (ptr < page_address(page)) | |
f4e6e289 KC |
4202 | usercopy_abort("SLUB object not in SLUB page?!", NULL, |
4203 | to_user, 0, n); | |
ed18adc1 KC |
4204 | |
4205 | /* Find offset within object. */ | |
b89fb5ef AP |
4206 | if (is_kfence) |
4207 | offset = ptr - kfence_object_start(ptr); | |
4208 | else | |
4209 | offset = (ptr - page_address(page)) % s->size; | |
ed18adc1 KC |
4210 | |
4211 | /* Adjust for redzone and reject if within the redzone. */ | |
b89fb5ef | 4212 | if (!is_kfence && kmem_cache_debug_flags(s, SLAB_RED_ZONE)) { |
ed18adc1 | 4213 | if (offset < s->red_left_pad) |
f4e6e289 KC |
4214 | usercopy_abort("SLUB object in left red zone", |
4215 | s->name, to_user, offset, n); | |
ed18adc1 KC |
4216 | offset -= s->red_left_pad; |
4217 | } | |
4218 | ||
afcc90f8 KC |
4219 | /* Allow address range falling entirely within usercopy region. */ |
4220 | if (offset >= s->useroffset && | |
4221 | offset - s->useroffset <= s->usersize && | |
4222 | n <= s->useroffset - offset + s->usersize) | |
f4e6e289 | 4223 | return; |
ed18adc1 | 4224 | |
afcc90f8 KC |
4225 | /* |
4226 | * If the copy is still within the allocated object, produce | |
4227 | * a warning instead of rejecting the copy. This is intended | |
4228 | * to be a temporary method to find any missing usercopy | |
4229 | * whitelists. | |
4230 | */ | |
4231 | object_size = slab_ksize(s); | |
2d891fbc KC |
4232 | if (usercopy_fallback && |
4233 | offset <= object_size && n <= object_size - offset) { | |
afcc90f8 KC |
4234 | usercopy_warn("SLUB object", s->name, to_user, offset, n); |
4235 | return; | |
4236 | } | |
ed18adc1 | 4237 | |
f4e6e289 | 4238 | usercopy_abort("SLUB object", s->name, to_user, offset, n); |
ed18adc1 KC |
4239 | } |
4240 | #endif /* CONFIG_HARDENED_USERCOPY */ | |
4241 | ||
10d1f8cb | 4242 | size_t __ksize(const void *object) |
81819f0f | 4243 | { |
272c1d21 | 4244 | struct page *page; |
81819f0f | 4245 | |
ef8b4520 | 4246 | if (unlikely(object == ZERO_SIZE_PTR)) |
272c1d21 CL |
4247 | return 0; |
4248 | ||
294a80a8 | 4249 | page = virt_to_head_page(object); |
294a80a8 | 4250 | |
76994412 PE |
4251 | if (unlikely(!PageSlab(page))) { |
4252 | WARN_ON(!PageCompound(page)); | |
a50b854e | 4253 | return page_size(page); |
76994412 | 4254 | } |
81819f0f | 4255 | |
1b4f59e3 | 4256 | return slab_ksize(page->slab_cache); |
81819f0f | 4257 | } |
10d1f8cb | 4258 | EXPORT_SYMBOL(__ksize); |
81819f0f CL |
4259 | |
4260 | void kfree(const void *x) | |
4261 | { | |
81819f0f | 4262 | struct page *page; |
5bb983b0 | 4263 | void *object = (void *)x; |
81819f0f | 4264 | |
2121db74 PE |
4265 | trace_kfree(_RET_IP_, x); |
4266 | ||
2408c550 | 4267 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
81819f0f CL |
4268 | return; |
4269 | ||
b49af68f | 4270 | page = virt_to_head_page(x); |
aadb4bc4 | 4271 | if (unlikely(!PageSlab(page))) { |
6a486c0a VB |
4272 | unsigned int order = compound_order(page); |
4273 | ||
0937502a | 4274 | BUG_ON(!PageCompound(page)); |
47adccce | 4275 | kfree_hook(object); |
96403bfe MS |
4276 | mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B, |
4277 | -(PAGE_SIZE << order)); | |
6a486c0a | 4278 | __free_pages(page, order); |
aadb4bc4 CL |
4279 | return; |
4280 | } | |
81084651 | 4281 | slab_free(page->slab_cache, page, object, NULL, 1, _RET_IP_); |
81819f0f CL |
4282 | } |
4283 | EXPORT_SYMBOL(kfree); | |
4284 | ||
832f37f5 VD |
4285 | #define SHRINK_PROMOTE_MAX 32 |
4286 | ||
2086d26a | 4287 | /* |
832f37f5 VD |
4288 | * kmem_cache_shrink discards empty slabs and promotes the slabs filled |
4289 | * up most to the head of the partial lists. New allocations will then | |
4290 | * fill those up and thus they can be removed from the partial lists. | |
672bba3a CL |
4291 | * |
4292 | * The slabs with the least items are placed last. This results in them | |
4293 | * being allocated from last increasing the chance that the last objects | |
4294 | * are freed in them. | |
2086d26a | 4295 | */ |
c9fc5864 | 4296 | int __kmem_cache_shrink(struct kmem_cache *s) |
2086d26a CL |
4297 | { |
4298 | int node; | |
4299 | int i; | |
4300 | struct kmem_cache_node *n; | |
4301 | struct page *page; | |
4302 | struct page *t; | |
832f37f5 VD |
4303 | struct list_head discard; |
4304 | struct list_head promote[SHRINK_PROMOTE_MAX]; | |
2086d26a | 4305 | unsigned long flags; |
ce3712d7 | 4306 | int ret = 0; |
2086d26a | 4307 | |
2086d26a | 4308 | flush_all(s); |
fa45dc25 | 4309 | for_each_kmem_cache_node(s, node, n) { |
832f37f5 VD |
4310 | INIT_LIST_HEAD(&discard); |
4311 | for (i = 0; i < SHRINK_PROMOTE_MAX; i++) | |
4312 | INIT_LIST_HEAD(promote + i); | |
2086d26a CL |
4313 | |
4314 | spin_lock_irqsave(&n->list_lock, flags); | |
4315 | ||
4316 | /* | |
832f37f5 | 4317 | * Build lists of slabs to discard or promote. |
2086d26a | 4318 | * |
672bba3a CL |
4319 | * Note that concurrent frees may occur while we hold the |
4320 | * list_lock. page->inuse here is the upper limit. | |
2086d26a | 4321 | */ |
916ac052 | 4322 | list_for_each_entry_safe(page, t, &n->partial, slab_list) { |
832f37f5 VD |
4323 | int free = page->objects - page->inuse; |
4324 | ||
4325 | /* Do not reread page->inuse */ | |
4326 | barrier(); | |
4327 | ||
4328 | /* We do not keep full slabs on the list */ | |
4329 | BUG_ON(free <= 0); | |
4330 | ||
4331 | if (free == page->objects) { | |
916ac052 | 4332 | list_move(&page->slab_list, &discard); |
69cb8e6b | 4333 | n->nr_partial--; |
832f37f5 | 4334 | } else if (free <= SHRINK_PROMOTE_MAX) |
916ac052 | 4335 | list_move(&page->slab_list, promote + free - 1); |
2086d26a CL |
4336 | } |
4337 | ||
2086d26a | 4338 | /* |
832f37f5 VD |
4339 | * Promote the slabs filled up most to the head of the |
4340 | * partial list. | |
2086d26a | 4341 | */ |
832f37f5 VD |
4342 | for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--) |
4343 | list_splice(promote + i, &n->partial); | |
2086d26a | 4344 | |
2086d26a | 4345 | spin_unlock_irqrestore(&n->list_lock, flags); |
69cb8e6b CL |
4346 | |
4347 | /* Release empty slabs */ | |
916ac052 | 4348 | list_for_each_entry_safe(page, t, &discard, slab_list) |
69cb8e6b | 4349 | discard_slab(s, page); |
ce3712d7 VD |
4350 | |
4351 | if (slabs_node(s, node)) | |
4352 | ret = 1; | |
2086d26a CL |
4353 | } |
4354 | ||
ce3712d7 | 4355 | return ret; |
2086d26a | 4356 | } |
2086d26a | 4357 | |
b9049e23 YG |
4358 | static int slab_mem_going_offline_callback(void *arg) |
4359 | { | |
4360 | struct kmem_cache *s; | |
4361 | ||
18004c5d | 4362 | mutex_lock(&slab_mutex); |
b9049e23 | 4363 | list_for_each_entry(s, &slab_caches, list) |
c9fc5864 | 4364 | __kmem_cache_shrink(s); |
18004c5d | 4365 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
4366 | |
4367 | return 0; | |
4368 | } | |
4369 | ||
4370 | static void slab_mem_offline_callback(void *arg) | |
4371 | { | |
b9049e23 YG |
4372 | struct memory_notify *marg = arg; |
4373 | int offline_node; | |
4374 | ||
b9d5ab25 | 4375 | offline_node = marg->status_change_nid_normal; |
b9049e23 YG |
4376 | |
4377 | /* | |
4378 | * If the node still has available memory. we need kmem_cache_node | |
4379 | * for it yet. | |
4380 | */ | |
4381 | if (offline_node < 0) | |
4382 | return; | |
4383 | ||
18004c5d | 4384 | mutex_lock(&slab_mutex); |
7e1fa93d | 4385 | node_clear(offline_node, slab_nodes); |
666716fd VB |
4386 | /* |
4387 | * We no longer free kmem_cache_node structures here, as it would be | |
4388 | * racy with all get_node() users, and infeasible to protect them with | |
4389 | * slab_mutex. | |
4390 | */ | |
18004c5d | 4391 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
4392 | } |
4393 | ||
4394 | static int slab_mem_going_online_callback(void *arg) | |
4395 | { | |
4396 | struct kmem_cache_node *n; | |
4397 | struct kmem_cache *s; | |
4398 | struct memory_notify *marg = arg; | |
b9d5ab25 | 4399 | int nid = marg->status_change_nid_normal; |
b9049e23 YG |
4400 | int ret = 0; |
4401 | ||
4402 | /* | |
4403 | * If the node's memory is already available, then kmem_cache_node is | |
4404 | * already created. Nothing to do. | |
4405 | */ | |
4406 | if (nid < 0) | |
4407 | return 0; | |
4408 | ||
4409 | /* | |
0121c619 | 4410 | * We are bringing a node online. No memory is available yet. We must |
b9049e23 YG |
4411 | * allocate a kmem_cache_node structure in order to bring the node |
4412 | * online. | |
4413 | */ | |
18004c5d | 4414 | mutex_lock(&slab_mutex); |
b9049e23 | 4415 | list_for_each_entry(s, &slab_caches, list) { |
666716fd VB |
4416 | /* |
4417 | * The structure may already exist if the node was previously | |
4418 | * onlined and offlined. | |
4419 | */ | |
4420 | if (get_node(s, nid)) | |
4421 | continue; | |
b9049e23 YG |
4422 | /* |
4423 | * XXX: kmem_cache_alloc_node will fallback to other nodes | |
4424 | * since memory is not yet available from the node that | |
4425 | * is brought up. | |
4426 | */ | |
8de66a0c | 4427 | n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL); |
b9049e23 YG |
4428 | if (!n) { |
4429 | ret = -ENOMEM; | |
4430 | goto out; | |
4431 | } | |
4053497d | 4432 | init_kmem_cache_node(n); |
b9049e23 YG |
4433 | s->node[nid] = n; |
4434 | } | |
7e1fa93d VB |
4435 | /* |
4436 | * Any cache created after this point will also have kmem_cache_node | |
4437 | * initialized for the new node. | |
4438 | */ | |
4439 | node_set(nid, slab_nodes); | |
b9049e23 | 4440 | out: |
18004c5d | 4441 | mutex_unlock(&slab_mutex); |
b9049e23 YG |
4442 | return ret; |
4443 | } | |
4444 | ||
4445 | static int slab_memory_callback(struct notifier_block *self, | |
4446 | unsigned long action, void *arg) | |
4447 | { | |
4448 | int ret = 0; | |
4449 | ||
4450 | switch (action) { | |
4451 | case MEM_GOING_ONLINE: | |
4452 | ret = slab_mem_going_online_callback(arg); | |
4453 | break; | |
4454 | case MEM_GOING_OFFLINE: | |
4455 | ret = slab_mem_going_offline_callback(arg); | |
4456 | break; | |
4457 | case MEM_OFFLINE: | |
4458 | case MEM_CANCEL_ONLINE: | |
4459 | slab_mem_offline_callback(arg); | |
4460 | break; | |
4461 | case MEM_ONLINE: | |
4462 | case MEM_CANCEL_OFFLINE: | |
4463 | break; | |
4464 | } | |
dc19f9db KH |
4465 | if (ret) |
4466 | ret = notifier_from_errno(ret); | |
4467 | else | |
4468 | ret = NOTIFY_OK; | |
b9049e23 YG |
4469 | return ret; |
4470 | } | |
4471 | ||
3ac38faa AM |
4472 | static struct notifier_block slab_memory_callback_nb = { |
4473 | .notifier_call = slab_memory_callback, | |
4474 | .priority = SLAB_CALLBACK_PRI, | |
4475 | }; | |
b9049e23 | 4476 | |
81819f0f CL |
4477 | /******************************************************************** |
4478 | * Basic setup of slabs | |
4479 | *******************************************************************/ | |
4480 | ||
51df1142 CL |
4481 | /* |
4482 | * Used for early kmem_cache structures that were allocated using | |
dffb4d60 CL |
4483 | * the page allocator. Allocate them properly then fix up the pointers |
4484 | * that may be pointing to the wrong kmem_cache structure. | |
51df1142 CL |
4485 | */ |
4486 | ||
dffb4d60 | 4487 | static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache) |
51df1142 CL |
4488 | { |
4489 | int node; | |
dffb4d60 | 4490 | struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); |
fa45dc25 | 4491 | struct kmem_cache_node *n; |
51df1142 | 4492 | |
dffb4d60 | 4493 | memcpy(s, static_cache, kmem_cache->object_size); |
51df1142 | 4494 | |
7d557b3c GC |
4495 | /* |
4496 | * This runs very early, and only the boot processor is supposed to be | |
4497 | * up. Even if it weren't true, IRQs are not up so we couldn't fire | |
4498 | * IPIs around. | |
4499 | */ | |
4500 | __flush_cpu_slab(s, smp_processor_id()); | |
fa45dc25 | 4501 | for_each_kmem_cache_node(s, node, n) { |
51df1142 CL |
4502 | struct page *p; |
4503 | ||
916ac052 | 4504 | list_for_each_entry(p, &n->partial, slab_list) |
fa45dc25 | 4505 | p->slab_cache = s; |
51df1142 | 4506 | |
607bf324 | 4507 | #ifdef CONFIG_SLUB_DEBUG |
916ac052 | 4508 | list_for_each_entry(p, &n->full, slab_list) |
fa45dc25 | 4509 | p->slab_cache = s; |
51df1142 | 4510 | #endif |
51df1142 | 4511 | } |
dffb4d60 CL |
4512 | list_add(&s->list, &slab_caches); |
4513 | return s; | |
51df1142 CL |
4514 | } |
4515 | ||
81819f0f CL |
4516 | void __init kmem_cache_init(void) |
4517 | { | |
dffb4d60 CL |
4518 | static __initdata struct kmem_cache boot_kmem_cache, |
4519 | boot_kmem_cache_node; | |
7e1fa93d | 4520 | int node; |
51df1142 | 4521 | |
fc8d8620 SG |
4522 | if (debug_guardpage_minorder()) |
4523 | slub_max_order = 0; | |
4524 | ||
79270291 SB |
4525 | /* Print slub debugging pointers without hashing */ |
4526 | if (__slub_debug_enabled()) | |
4527 | no_hash_pointers_enable(NULL); | |
4528 | ||
dffb4d60 CL |
4529 | kmem_cache_node = &boot_kmem_cache_node; |
4530 | kmem_cache = &boot_kmem_cache; | |
51df1142 | 4531 | |
7e1fa93d VB |
4532 | /* |
4533 | * Initialize the nodemask for which we will allocate per node | |
4534 | * structures. Here we don't need taking slab_mutex yet. | |
4535 | */ | |
4536 | for_each_node_state(node, N_NORMAL_MEMORY) | |
4537 | node_set(node, slab_nodes); | |
4538 | ||
dffb4d60 | 4539 | create_boot_cache(kmem_cache_node, "kmem_cache_node", |
8eb8284b | 4540 | sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN, 0, 0); |
b9049e23 | 4541 | |
3ac38faa | 4542 | register_hotmemory_notifier(&slab_memory_callback_nb); |
81819f0f CL |
4543 | |
4544 | /* Able to allocate the per node structures */ | |
4545 | slab_state = PARTIAL; | |
4546 | ||
dffb4d60 CL |
4547 | create_boot_cache(kmem_cache, "kmem_cache", |
4548 | offsetof(struct kmem_cache, node) + | |
4549 | nr_node_ids * sizeof(struct kmem_cache_node *), | |
8eb8284b | 4550 | SLAB_HWCACHE_ALIGN, 0, 0); |
8a13a4cc | 4551 | |
dffb4d60 | 4552 | kmem_cache = bootstrap(&boot_kmem_cache); |
dffb4d60 | 4553 | kmem_cache_node = bootstrap(&boot_kmem_cache_node); |
51df1142 CL |
4554 | |
4555 | /* Now we can use the kmem_cache to allocate kmalloc slabs */ | |
34cc6990 | 4556 | setup_kmalloc_cache_index_table(); |
f97d5f63 | 4557 | create_kmalloc_caches(0); |
81819f0f | 4558 | |
210e7a43 TG |
4559 | /* Setup random freelists for each cache */ |
4560 | init_freelist_randomization(); | |
4561 | ||
a96a87bf SAS |
4562 | cpuhp_setup_state_nocalls(CPUHP_SLUB_DEAD, "slub:dead", NULL, |
4563 | slub_cpu_dead); | |
81819f0f | 4564 | |
b9726c26 | 4565 | pr_info("SLUB: HWalign=%d, Order=%u-%u, MinObjects=%u, CPUs=%u, Nodes=%u\n", |
f97d5f63 | 4566 | cache_line_size(), |
81819f0f CL |
4567 | slub_min_order, slub_max_order, slub_min_objects, |
4568 | nr_cpu_ids, nr_node_ids); | |
4569 | } | |
4570 | ||
7e85ee0c PE |
4571 | void __init kmem_cache_init_late(void) |
4572 | { | |
7e85ee0c PE |
4573 | } |
4574 | ||
2633d7a0 | 4575 | struct kmem_cache * |
f4957d5b | 4576 | __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
d50112ed | 4577 | slab_flags_t flags, void (*ctor)(void *)) |
81819f0f | 4578 | { |
10befea9 | 4579 | struct kmem_cache *s; |
81819f0f | 4580 | |
a44cb944 | 4581 | s = find_mergeable(size, align, flags, name, ctor); |
81819f0f CL |
4582 | if (s) { |
4583 | s->refcount++; | |
84d0ddd6 | 4584 | |
81819f0f CL |
4585 | /* |
4586 | * Adjust the object sizes so that we clear | |
4587 | * the complete object on kzalloc. | |
4588 | */ | |
1b473f29 | 4589 | s->object_size = max(s->object_size, size); |
52ee6d74 | 4590 | s->inuse = max(s->inuse, ALIGN(size, sizeof(void *))); |
6446faa2 | 4591 | |
7b8f3b66 | 4592 | if (sysfs_slab_alias(s, name)) { |
7b8f3b66 | 4593 | s->refcount--; |
cbb79694 | 4594 | s = NULL; |
7b8f3b66 | 4595 | } |
a0e1d1be | 4596 | } |
6446faa2 | 4597 | |
cbb79694 CL |
4598 | return s; |
4599 | } | |
84c1cf62 | 4600 | |
d50112ed | 4601 | int __kmem_cache_create(struct kmem_cache *s, slab_flags_t flags) |
cbb79694 | 4602 | { |
aac3a166 PE |
4603 | int err; |
4604 | ||
4605 | err = kmem_cache_open(s, flags); | |
4606 | if (err) | |
4607 | return err; | |
20cea968 | 4608 | |
45530c44 CL |
4609 | /* Mutex is not taken during early boot */ |
4610 | if (slab_state <= UP) | |
4611 | return 0; | |
4612 | ||
aac3a166 | 4613 | err = sysfs_slab_add(s); |
aac3a166 | 4614 | if (err) |
52b4b950 | 4615 | __kmem_cache_release(s); |
20cea968 | 4616 | |
64dd6849 FM |
4617 | if (s->flags & SLAB_STORE_USER) |
4618 | debugfs_slab_add(s); | |
4619 | ||
aac3a166 | 4620 | return err; |
81819f0f | 4621 | } |
81819f0f | 4622 | |
ce71e27c | 4623 | void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) |
81819f0f | 4624 | { |
aadb4bc4 | 4625 | struct kmem_cache *s; |
94b528d0 | 4626 | void *ret; |
aadb4bc4 | 4627 | |
95a05b42 | 4628 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) |
eada35ef PE |
4629 | return kmalloc_large(size, gfpflags); |
4630 | ||
2c59dd65 | 4631 | s = kmalloc_slab(size, gfpflags); |
81819f0f | 4632 | |
2408c550 | 4633 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
6cb8f913 | 4634 | return s; |
81819f0f | 4635 | |
b89fb5ef | 4636 | ret = slab_alloc(s, gfpflags, caller, size); |
94b528d0 | 4637 | |
25985edc | 4638 | /* Honor the call site pointer we received. */ |
ca2b84cb | 4639 | trace_kmalloc(caller, ret, size, s->size, gfpflags); |
94b528d0 EGM |
4640 | |
4641 | return ret; | |
81819f0f | 4642 | } |
fd7cb575 | 4643 | EXPORT_SYMBOL(__kmalloc_track_caller); |
81819f0f | 4644 | |
5d1f57e4 | 4645 | #ifdef CONFIG_NUMA |
81819f0f | 4646 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, |
ce71e27c | 4647 | int node, unsigned long caller) |
81819f0f | 4648 | { |
aadb4bc4 | 4649 | struct kmem_cache *s; |
94b528d0 | 4650 | void *ret; |
aadb4bc4 | 4651 | |
95a05b42 | 4652 | if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) { |
d3e14aa3 XF |
4653 | ret = kmalloc_large_node(size, gfpflags, node); |
4654 | ||
4655 | trace_kmalloc_node(caller, ret, | |
4656 | size, PAGE_SIZE << get_order(size), | |
4657 | gfpflags, node); | |
4658 | ||
4659 | return ret; | |
4660 | } | |
eada35ef | 4661 | |
2c59dd65 | 4662 | s = kmalloc_slab(size, gfpflags); |
81819f0f | 4663 | |
2408c550 | 4664 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
6cb8f913 | 4665 | return s; |
81819f0f | 4666 | |
b89fb5ef | 4667 | ret = slab_alloc_node(s, gfpflags, node, caller, size); |
94b528d0 | 4668 | |
25985edc | 4669 | /* Honor the call site pointer we received. */ |
ca2b84cb | 4670 | trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node); |
94b528d0 EGM |
4671 | |
4672 | return ret; | |
81819f0f | 4673 | } |
fd7cb575 | 4674 | EXPORT_SYMBOL(__kmalloc_node_track_caller); |
5d1f57e4 | 4675 | #endif |
81819f0f | 4676 | |
ab4d5ed5 | 4677 | #ifdef CONFIG_SYSFS |
205ab99d CL |
4678 | static int count_inuse(struct page *page) |
4679 | { | |
4680 | return page->inuse; | |
4681 | } | |
4682 | ||
4683 | static int count_total(struct page *page) | |
4684 | { | |
4685 | return page->objects; | |
4686 | } | |
ab4d5ed5 | 4687 | #endif |
205ab99d | 4688 | |
ab4d5ed5 | 4689 | #ifdef CONFIG_SLUB_DEBUG |
90e9f6a6 | 4690 | static void validate_slab(struct kmem_cache *s, struct page *page) |
53e15af0 CL |
4691 | { |
4692 | void *p; | |
a973e9dd | 4693 | void *addr = page_address(page); |
90e9f6a6 YZ |
4694 | unsigned long *map; |
4695 | ||
4696 | slab_lock(page); | |
53e15af0 | 4697 | |
dd98afd4 | 4698 | if (!check_slab(s, page) || !on_freelist(s, page, NULL)) |
90e9f6a6 | 4699 | goto unlock; |
53e15af0 CL |
4700 | |
4701 | /* Now we know that a valid freelist exists */ | |
90e9f6a6 | 4702 | map = get_map(s, page); |
5f80b13a | 4703 | for_each_object(p, s, addr, page->objects) { |
4138fdfc | 4704 | u8 val = test_bit(__obj_to_index(s, addr, p), map) ? |
dd98afd4 | 4705 | SLUB_RED_INACTIVE : SLUB_RED_ACTIVE; |
53e15af0 | 4706 | |
dd98afd4 YZ |
4707 | if (!check_object(s, page, p, val)) |
4708 | break; | |
4709 | } | |
90e9f6a6 YZ |
4710 | put_map(map); |
4711 | unlock: | |
881db7fb | 4712 | slab_unlock(page); |
53e15af0 CL |
4713 | } |
4714 | ||
434e245d | 4715 | static int validate_slab_node(struct kmem_cache *s, |
90e9f6a6 | 4716 | struct kmem_cache_node *n) |
53e15af0 CL |
4717 | { |
4718 | unsigned long count = 0; | |
4719 | struct page *page; | |
4720 | unsigned long flags; | |
4721 | ||
4722 | spin_lock_irqsave(&n->list_lock, flags); | |
4723 | ||
916ac052 | 4724 | list_for_each_entry(page, &n->partial, slab_list) { |
90e9f6a6 | 4725 | validate_slab(s, page); |
53e15af0 CL |
4726 | count++; |
4727 | } | |
1f9f78b1 | 4728 | if (count != n->nr_partial) { |
f9f58285 FF |
4729 | pr_err("SLUB %s: %ld partial slabs counted but counter=%ld\n", |
4730 | s->name, count, n->nr_partial); | |
1f9f78b1 OG |
4731 | slab_add_kunit_errors(); |
4732 | } | |
53e15af0 CL |
4733 | |
4734 | if (!(s->flags & SLAB_STORE_USER)) | |
4735 | goto out; | |
4736 | ||
916ac052 | 4737 | list_for_each_entry(page, &n->full, slab_list) { |
90e9f6a6 | 4738 | validate_slab(s, page); |
53e15af0 CL |
4739 | count++; |
4740 | } | |
1f9f78b1 | 4741 | if (count != atomic_long_read(&n->nr_slabs)) { |
f9f58285 FF |
4742 | pr_err("SLUB: %s %ld slabs counted but counter=%ld\n", |
4743 | s->name, count, atomic_long_read(&n->nr_slabs)); | |
1f9f78b1 OG |
4744 | slab_add_kunit_errors(); |
4745 | } | |
53e15af0 CL |
4746 | |
4747 | out: | |
4748 | spin_unlock_irqrestore(&n->list_lock, flags); | |
4749 | return count; | |
4750 | } | |
4751 | ||
1f9f78b1 | 4752 | long validate_slab_cache(struct kmem_cache *s) |
53e15af0 CL |
4753 | { |
4754 | int node; | |
4755 | unsigned long count = 0; | |
fa45dc25 | 4756 | struct kmem_cache_node *n; |
53e15af0 CL |
4757 | |
4758 | flush_all(s); | |
fa45dc25 | 4759 | for_each_kmem_cache_node(s, node, n) |
90e9f6a6 YZ |
4760 | count += validate_slab_node(s, n); |
4761 | ||
53e15af0 CL |
4762 | return count; |
4763 | } | |
1f9f78b1 OG |
4764 | EXPORT_SYMBOL(validate_slab_cache); |
4765 | ||
64dd6849 | 4766 | #ifdef CONFIG_DEBUG_FS |
88a420e4 | 4767 | /* |
672bba3a | 4768 | * Generate lists of code addresses where slabcache objects are allocated |
88a420e4 CL |
4769 | * and freed. |
4770 | */ | |
4771 | ||
4772 | struct location { | |
4773 | unsigned long count; | |
ce71e27c | 4774 | unsigned long addr; |
45edfa58 CL |
4775 | long long sum_time; |
4776 | long min_time; | |
4777 | long max_time; | |
4778 | long min_pid; | |
4779 | long max_pid; | |
174596a0 | 4780 | DECLARE_BITMAP(cpus, NR_CPUS); |
45edfa58 | 4781 | nodemask_t nodes; |
88a420e4 CL |
4782 | }; |
4783 | ||
4784 | struct loc_track { | |
4785 | unsigned long max; | |
4786 | unsigned long count; | |
4787 | struct location *loc; | |
4788 | }; | |
4789 | ||
64dd6849 FM |
4790 | static struct dentry *slab_debugfs_root; |
4791 | ||
88a420e4 CL |
4792 | static void free_loc_track(struct loc_track *t) |
4793 | { | |
4794 | if (t->max) | |
4795 | free_pages((unsigned long)t->loc, | |
4796 | get_order(sizeof(struct location) * t->max)); | |
4797 | } | |
4798 | ||
68dff6a9 | 4799 | static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags) |
88a420e4 CL |
4800 | { |
4801 | struct location *l; | |
4802 | int order; | |
4803 | ||
88a420e4 CL |
4804 | order = get_order(sizeof(struct location) * max); |
4805 | ||
68dff6a9 | 4806 | l = (void *)__get_free_pages(flags, order); |
88a420e4 CL |
4807 | if (!l) |
4808 | return 0; | |
4809 | ||
4810 | if (t->count) { | |
4811 | memcpy(l, t->loc, sizeof(struct location) * t->count); | |
4812 | free_loc_track(t); | |
4813 | } | |
4814 | t->max = max; | |
4815 | t->loc = l; | |
4816 | return 1; | |
4817 | } | |
4818 | ||
4819 | static int add_location(struct loc_track *t, struct kmem_cache *s, | |
45edfa58 | 4820 | const struct track *track) |
88a420e4 CL |
4821 | { |
4822 | long start, end, pos; | |
4823 | struct location *l; | |
ce71e27c | 4824 | unsigned long caddr; |
45edfa58 | 4825 | unsigned long age = jiffies - track->when; |
88a420e4 CL |
4826 | |
4827 | start = -1; | |
4828 | end = t->count; | |
4829 | ||
4830 | for ( ; ; ) { | |
4831 | pos = start + (end - start + 1) / 2; | |
4832 | ||
4833 | /* | |
4834 | * There is nothing at "end". If we end up there | |
4835 | * we need to add something to before end. | |
4836 | */ | |
4837 | if (pos == end) | |
4838 | break; | |
4839 | ||
4840 | caddr = t->loc[pos].addr; | |
45edfa58 CL |
4841 | if (track->addr == caddr) { |
4842 | ||
4843 | l = &t->loc[pos]; | |
4844 | l->count++; | |
4845 | if (track->when) { | |
4846 | l->sum_time += age; | |
4847 | if (age < l->min_time) | |
4848 | l->min_time = age; | |
4849 | if (age > l->max_time) | |
4850 | l->max_time = age; | |
4851 | ||
4852 | if (track->pid < l->min_pid) | |
4853 | l->min_pid = track->pid; | |
4854 | if (track->pid > l->max_pid) | |
4855 | l->max_pid = track->pid; | |
4856 | ||
174596a0 RR |
4857 | cpumask_set_cpu(track->cpu, |
4858 | to_cpumask(l->cpus)); | |
45edfa58 CL |
4859 | } |
4860 | node_set(page_to_nid(virt_to_page(track)), l->nodes); | |
88a420e4 CL |
4861 | return 1; |
4862 | } | |
4863 | ||
45edfa58 | 4864 | if (track->addr < caddr) |
88a420e4 CL |
4865 | end = pos; |
4866 | else | |
4867 | start = pos; | |
4868 | } | |
4869 | ||
4870 | /* | |
672bba3a | 4871 | * Not found. Insert new tracking element. |
88a420e4 | 4872 | */ |
68dff6a9 | 4873 | if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max, GFP_ATOMIC)) |
88a420e4 CL |
4874 | return 0; |
4875 | ||
4876 | l = t->loc + pos; | |
4877 | if (pos < t->count) | |
4878 | memmove(l + 1, l, | |
4879 | (t->count - pos) * sizeof(struct location)); | |
4880 | t->count++; | |
4881 | l->count = 1; | |
45edfa58 CL |
4882 | l->addr = track->addr; |
4883 | l->sum_time = age; | |
4884 | l->min_time = age; | |
4885 | l->max_time = age; | |
4886 | l->min_pid = track->pid; | |
4887 | l->max_pid = track->pid; | |
174596a0 RR |
4888 | cpumask_clear(to_cpumask(l->cpus)); |
4889 | cpumask_set_cpu(track->cpu, to_cpumask(l->cpus)); | |
45edfa58 CL |
4890 | nodes_clear(l->nodes); |
4891 | node_set(page_to_nid(virt_to_page(track)), l->nodes); | |
88a420e4 CL |
4892 | return 1; |
4893 | } | |
4894 | ||
4895 | static void process_slab(struct loc_track *t, struct kmem_cache *s, | |
90e9f6a6 | 4896 | struct page *page, enum track_item alloc) |
88a420e4 | 4897 | { |
a973e9dd | 4898 | void *addr = page_address(page); |
88a420e4 | 4899 | void *p; |
90e9f6a6 | 4900 | unsigned long *map; |
88a420e4 | 4901 | |
90e9f6a6 | 4902 | map = get_map(s, page); |
224a88be | 4903 | for_each_object(p, s, addr, page->objects) |
4138fdfc | 4904 | if (!test_bit(__obj_to_index(s, addr, p), map)) |
45edfa58 | 4905 | add_location(t, s, get_track(s, p, alloc)); |
90e9f6a6 | 4906 | put_map(map); |
88a420e4 | 4907 | } |
64dd6849 | 4908 | #endif /* CONFIG_DEBUG_FS */ |
6dfd1b65 | 4909 | #endif /* CONFIG_SLUB_DEBUG */ |
88a420e4 | 4910 | |
ab4d5ed5 | 4911 | #ifdef CONFIG_SYSFS |
81819f0f | 4912 | enum slab_stat_type { |
205ab99d CL |
4913 | SL_ALL, /* All slabs */ |
4914 | SL_PARTIAL, /* Only partially allocated slabs */ | |
4915 | SL_CPU, /* Only slabs used for cpu caches */ | |
4916 | SL_OBJECTS, /* Determine allocated objects not slabs */ | |
4917 | SL_TOTAL /* Determine object capacity not slabs */ | |
81819f0f CL |
4918 | }; |
4919 | ||
205ab99d | 4920 | #define SO_ALL (1 << SL_ALL) |
81819f0f CL |
4921 | #define SO_PARTIAL (1 << SL_PARTIAL) |
4922 | #define SO_CPU (1 << SL_CPU) | |
4923 | #define SO_OBJECTS (1 << SL_OBJECTS) | |
205ab99d | 4924 | #define SO_TOTAL (1 << SL_TOTAL) |
81819f0f | 4925 | |
62e5c4b4 | 4926 | static ssize_t show_slab_objects(struct kmem_cache *s, |
bf16d19a | 4927 | char *buf, unsigned long flags) |
81819f0f CL |
4928 | { |
4929 | unsigned long total = 0; | |
81819f0f CL |
4930 | int node; |
4931 | int x; | |
4932 | unsigned long *nodes; | |
bf16d19a | 4933 | int len = 0; |
81819f0f | 4934 | |
6396bb22 | 4935 | nodes = kcalloc(nr_node_ids, sizeof(unsigned long), GFP_KERNEL); |
62e5c4b4 CG |
4936 | if (!nodes) |
4937 | return -ENOMEM; | |
81819f0f | 4938 | |
205ab99d CL |
4939 | if (flags & SO_CPU) { |
4940 | int cpu; | |
81819f0f | 4941 | |
205ab99d | 4942 | for_each_possible_cpu(cpu) { |
d0e0ac97 CG |
4943 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, |
4944 | cpu); | |
ec3ab083 | 4945 | int node; |
49e22585 | 4946 | struct page *page; |
dfb4f096 | 4947 | |
4db0c3c2 | 4948 | page = READ_ONCE(c->page); |
ec3ab083 CL |
4949 | if (!page) |
4950 | continue; | |
205ab99d | 4951 | |
ec3ab083 CL |
4952 | node = page_to_nid(page); |
4953 | if (flags & SO_TOTAL) | |
4954 | x = page->objects; | |
4955 | else if (flags & SO_OBJECTS) | |
4956 | x = page->inuse; | |
4957 | else | |
4958 | x = 1; | |
49e22585 | 4959 | |
ec3ab083 CL |
4960 | total += x; |
4961 | nodes[node] += x; | |
4962 | ||
a93cf07b | 4963 | page = slub_percpu_partial_read_once(c); |
49e22585 | 4964 | if (page) { |
8afb1474 LZ |
4965 | node = page_to_nid(page); |
4966 | if (flags & SO_TOTAL) | |
4967 | WARN_ON_ONCE(1); | |
4968 | else if (flags & SO_OBJECTS) | |
4969 | WARN_ON_ONCE(1); | |
4970 | else | |
4971 | x = page->pages; | |
bc6697d8 ED |
4972 | total += x; |
4973 | nodes[node] += x; | |
49e22585 | 4974 | } |
81819f0f CL |
4975 | } |
4976 | } | |
4977 | ||
e4f8e513 QC |
4978 | /* |
4979 | * It is impossible to take "mem_hotplug_lock" here with "kernfs_mutex" | |
4980 | * already held which will conflict with an existing lock order: | |
4981 | * | |
4982 | * mem_hotplug_lock->slab_mutex->kernfs_mutex | |
4983 | * | |
4984 | * We don't really need mem_hotplug_lock (to hold off | |
4985 | * slab_mem_going_offline_callback) here because slab's memory hot | |
4986 | * unplug code doesn't destroy the kmem_cache->node[] data. | |
4987 | */ | |
4988 | ||
ab4d5ed5 | 4989 | #ifdef CONFIG_SLUB_DEBUG |
205ab99d | 4990 | if (flags & SO_ALL) { |
fa45dc25 CL |
4991 | struct kmem_cache_node *n; |
4992 | ||
4993 | for_each_kmem_cache_node(s, node, n) { | |
205ab99d | 4994 | |
d0e0ac97 CG |
4995 | if (flags & SO_TOTAL) |
4996 | x = atomic_long_read(&n->total_objects); | |
4997 | else if (flags & SO_OBJECTS) | |
4998 | x = atomic_long_read(&n->total_objects) - | |
4999 | count_partial(n, count_free); | |
81819f0f | 5000 | else |
205ab99d | 5001 | x = atomic_long_read(&n->nr_slabs); |
81819f0f CL |
5002 | total += x; |
5003 | nodes[node] += x; | |
5004 | } | |
5005 | ||
ab4d5ed5 CL |
5006 | } else |
5007 | #endif | |
5008 | if (flags & SO_PARTIAL) { | |
fa45dc25 | 5009 | struct kmem_cache_node *n; |
81819f0f | 5010 | |
fa45dc25 | 5011 | for_each_kmem_cache_node(s, node, n) { |
205ab99d CL |
5012 | if (flags & SO_TOTAL) |
5013 | x = count_partial(n, count_total); | |
5014 | else if (flags & SO_OBJECTS) | |
5015 | x = count_partial(n, count_inuse); | |
81819f0f | 5016 | else |
205ab99d | 5017 | x = n->nr_partial; |
81819f0f CL |
5018 | total += x; |
5019 | nodes[node] += x; | |
5020 | } | |
5021 | } | |
bf16d19a JP |
5022 | |
5023 | len += sysfs_emit_at(buf, len, "%lu", total); | |
81819f0f | 5024 | #ifdef CONFIG_NUMA |
bf16d19a | 5025 | for (node = 0; node < nr_node_ids; node++) { |
81819f0f | 5026 | if (nodes[node]) |
bf16d19a JP |
5027 | len += sysfs_emit_at(buf, len, " N%d=%lu", |
5028 | node, nodes[node]); | |
5029 | } | |
81819f0f | 5030 | #endif |
bf16d19a | 5031 | len += sysfs_emit_at(buf, len, "\n"); |
81819f0f | 5032 | kfree(nodes); |
bf16d19a JP |
5033 | |
5034 | return len; | |
81819f0f CL |
5035 | } |
5036 | ||
81819f0f | 5037 | #define to_slab_attr(n) container_of(n, struct slab_attribute, attr) |
497888cf | 5038 | #define to_slab(n) container_of(n, struct kmem_cache, kobj) |
81819f0f CL |
5039 | |
5040 | struct slab_attribute { | |
5041 | struct attribute attr; | |
5042 | ssize_t (*show)(struct kmem_cache *s, char *buf); | |
5043 | ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count); | |
5044 | }; | |
5045 | ||
5046 | #define SLAB_ATTR_RO(_name) \ | |
ab067e99 VK |
5047 | static struct slab_attribute _name##_attr = \ |
5048 | __ATTR(_name, 0400, _name##_show, NULL) | |
81819f0f CL |
5049 | |
5050 | #define SLAB_ATTR(_name) \ | |
5051 | static struct slab_attribute _name##_attr = \ | |
ab067e99 | 5052 | __ATTR(_name, 0600, _name##_show, _name##_store) |
81819f0f | 5053 | |
81819f0f CL |
5054 | static ssize_t slab_size_show(struct kmem_cache *s, char *buf) |
5055 | { | |
bf16d19a | 5056 | return sysfs_emit(buf, "%u\n", s->size); |
81819f0f CL |
5057 | } |
5058 | SLAB_ATTR_RO(slab_size); | |
5059 | ||
5060 | static ssize_t align_show(struct kmem_cache *s, char *buf) | |
5061 | { | |
bf16d19a | 5062 | return sysfs_emit(buf, "%u\n", s->align); |
81819f0f CL |
5063 | } |
5064 | SLAB_ATTR_RO(align); | |
5065 | ||
5066 | static ssize_t object_size_show(struct kmem_cache *s, char *buf) | |
5067 | { | |
bf16d19a | 5068 | return sysfs_emit(buf, "%u\n", s->object_size); |
81819f0f CL |
5069 | } |
5070 | SLAB_ATTR_RO(object_size); | |
5071 | ||
5072 | static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf) | |
5073 | { | |
bf16d19a | 5074 | return sysfs_emit(buf, "%u\n", oo_objects(s->oo)); |
81819f0f CL |
5075 | } |
5076 | SLAB_ATTR_RO(objs_per_slab); | |
5077 | ||
5078 | static ssize_t order_show(struct kmem_cache *s, char *buf) | |
5079 | { | |
bf16d19a | 5080 | return sysfs_emit(buf, "%u\n", oo_order(s->oo)); |
81819f0f | 5081 | } |
32a6f409 | 5082 | SLAB_ATTR_RO(order); |
81819f0f | 5083 | |
73d342b1 DR |
5084 | static ssize_t min_partial_show(struct kmem_cache *s, char *buf) |
5085 | { | |
bf16d19a | 5086 | return sysfs_emit(buf, "%lu\n", s->min_partial); |
73d342b1 DR |
5087 | } |
5088 | ||
5089 | static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, | |
5090 | size_t length) | |
5091 | { | |
5092 | unsigned long min; | |
5093 | int err; | |
5094 | ||
3dbb95f7 | 5095 | err = kstrtoul(buf, 10, &min); |
73d342b1 DR |
5096 | if (err) |
5097 | return err; | |
5098 | ||
c0bdb232 | 5099 | set_min_partial(s, min); |
73d342b1 DR |
5100 | return length; |
5101 | } | |
5102 | SLAB_ATTR(min_partial); | |
5103 | ||
49e22585 CL |
5104 | static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf) |
5105 | { | |
bf16d19a | 5106 | return sysfs_emit(buf, "%u\n", slub_cpu_partial(s)); |
49e22585 CL |
5107 | } |
5108 | ||
5109 | static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf, | |
5110 | size_t length) | |
5111 | { | |
e5d9998f | 5112 | unsigned int objects; |
49e22585 CL |
5113 | int err; |
5114 | ||
e5d9998f | 5115 | err = kstrtouint(buf, 10, &objects); |
49e22585 CL |
5116 | if (err) |
5117 | return err; | |
345c905d | 5118 | if (objects && !kmem_cache_has_cpu_partial(s)) |
74ee4ef1 | 5119 | return -EINVAL; |
49e22585 | 5120 | |
e6d0e1dc | 5121 | slub_set_cpu_partial(s, objects); |
49e22585 CL |
5122 | flush_all(s); |
5123 | return length; | |
5124 | } | |
5125 | SLAB_ATTR(cpu_partial); | |
5126 | ||
81819f0f CL |
5127 | static ssize_t ctor_show(struct kmem_cache *s, char *buf) |
5128 | { | |
62c70bce JP |
5129 | if (!s->ctor) |
5130 | return 0; | |
bf16d19a | 5131 | return sysfs_emit(buf, "%pS\n", s->ctor); |
81819f0f CL |
5132 | } |
5133 | SLAB_ATTR_RO(ctor); | |
5134 | ||
81819f0f CL |
5135 | static ssize_t aliases_show(struct kmem_cache *s, char *buf) |
5136 | { | |
bf16d19a | 5137 | return sysfs_emit(buf, "%d\n", s->refcount < 0 ? 0 : s->refcount - 1); |
81819f0f CL |
5138 | } |
5139 | SLAB_ATTR_RO(aliases); | |
5140 | ||
81819f0f CL |
5141 | static ssize_t partial_show(struct kmem_cache *s, char *buf) |
5142 | { | |
d9acf4b7 | 5143 | return show_slab_objects(s, buf, SO_PARTIAL); |
81819f0f CL |
5144 | } |
5145 | SLAB_ATTR_RO(partial); | |
5146 | ||
5147 | static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf) | |
5148 | { | |
d9acf4b7 | 5149 | return show_slab_objects(s, buf, SO_CPU); |
81819f0f CL |
5150 | } |
5151 | SLAB_ATTR_RO(cpu_slabs); | |
5152 | ||
5153 | static ssize_t objects_show(struct kmem_cache *s, char *buf) | |
5154 | { | |
205ab99d | 5155 | return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS); |
81819f0f CL |
5156 | } |
5157 | SLAB_ATTR_RO(objects); | |
5158 | ||
205ab99d CL |
5159 | static ssize_t objects_partial_show(struct kmem_cache *s, char *buf) |
5160 | { | |
5161 | return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS); | |
5162 | } | |
5163 | SLAB_ATTR_RO(objects_partial); | |
5164 | ||
49e22585 CL |
5165 | static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) |
5166 | { | |
5167 | int objects = 0; | |
5168 | int pages = 0; | |
5169 | int cpu; | |
bf16d19a | 5170 | int len = 0; |
49e22585 CL |
5171 | |
5172 | for_each_online_cpu(cpu) { | |
a93cf07b WY |
5173 | struct page *page; |
5174 | ||
5175 | page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); | |
49e22585 CL |
5176 | |
5177 | if (page) { | |
5178 | pages += page->pages; | |
5179 | objects += page->pobjects; | |
5180 | } | |
5181 | } | |
5182 | ||
bf16d19a | 5183 | len += sysfs_emit_at(buf, len, "%d(%d)", objects, pages); |
49e22585 CL |
5184 | |
5185 | #ifdef CONFIG_SMP | |
5186 | for_each_online_cpu(cpu) { | |
a93cf07b WY |
5187 | struct page *page; |
5188 | ||
5189 | page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); | |
bf16d19a JP |
5190 | if (page) |
5191 | len += sysfs_emit_at(buf, len, " C%d=%d(%d)", | |
5192 | cpu, page->pobjects, page->pages); | |
49e22585 CL |
5193 | } |
5194 | #endif | |
bf16d19a JP |
5195 | len += sysfs_emit_at(buf, len, "\n"); |
5196 | ||
5197 | return len; | |
49e22585 CL |
5198 | } |
5199 | SLAB_ATTR_RO(slabs_cpu_partial); | |
5200 | ||
a5a84755 CL |
5201 | static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf) |
5202 | { | |
bf16d19a | 5203 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT)); |
a5a84755 | 5204 | } |
8f58119a | 5205 | SLAB_ATTR_RO(reclaim_account); |
a5a84755 CL |
5206 | |
5207 | static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf) | |
5208 | { | |
bf16d19a | 5209 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN)); |
a5a84755 CL |
5210 | } |
5211 | SLAB_ATTR_RO(hwcache_align); | |
5212 | ||
5213 | #ifdef CONFIG_ZONE_DMA | |
5214 | static ssize_t cache_dma_show(struct kmem_cache *s, char *buf) | |
5215 | { | |
bf16d19a | 5216 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA)); |
a5a84755 CL |
5217 | } |
5218 | SLAB_ATTR_RO(cache_dma); | |
5219 | #endif | |
5220 | ||
8eb8284b DW |
5221 | static ssize_t usersize_show(struct kmem_cache *s, char *buf) |
5222 | { | |
bf16d19a | 5223 | return sysfs_emit(buf, "%u\n", s->usersize); |
8eb8284b DW |
5224 | } |
5225 | SLAB_ATTR_RO(usersize); | |
5226 | ||
a5a84755 CL |
5227 | static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf) |
5228 | { | |
bf16d19a | 5229 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_TYPESAFE_BY_RCU)); |
a5a84755 CL |
5230 | } |
5231 | SLAB_ATTR_RO(destroy_by_rcu); | |
5232 | ||
ab4d5ed5 | 5233 | #ifdef CONFIG_SLUB_DEBUG |
a5a84755 CL |
5234 | static ssize_t slabs_show(struct kmem_cache *s, char *buf) |
5235 | { | |
5236 | return show_slab_objects(s, buf, SO_ALL); | |
5237 | } | |
5238 | SLAB_ATTR_RO(slabs); | |
5239 | ||
205ab99d CL |
5240 | static ssize_t total_objects_show(struct kmem_cache *s, char *buf) |
5241 | { | |
5242 | return show_slab_objects(s, buf, SO_ALL|SO_TOTAL); | |
5243 | } | |
5244 | SLAB_ATTR_RO(total_objects); | |
5245 | ||
81819f0f CL |
5246 | static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf) |
5247 | { | |
bf16d19a | 5248 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_CONSISTENCY_CHECKS)); |
81819f0f | 5249 | } |
060807f8 | 5250 | SLAB_ATTR_RO(sanity_checks); |
81819f0f CL |
5251 | |
5252 | static ssize_t trace_show(struct kmem_cache *s, char *buf) | |
5253 | { | |
bf16d19a | 5254 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_TRACE)); |
81819f0f | 5255 | } |
060807f8 | 5256 | SLAB_ATTR_RO(trace); |
81819f0f | 5257 | |
81819f0f CL |
5258 | static ssize_t red_zone_show(struct kmem_cache *s, char *buf) |
5259 | { | |
bf16d19a | 5260 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE)); |
81819f0f CL |
5261 | } |
5262 | ||
ad38b5b1 | 5263 | SLAB_ATTR_RO(red_zone); |
81819f0f CL |
5264 | |
5265 | static ssize_t poison_show(struct kmem_cache *s, char *buf) | |
5266 | { | |
bf16d19a | 5267 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_POISON)); |
81819f0f CL |
5268 | } |
5269 | ||
ad38b5b1 | 5270 | SLAB_ATTR_RO(poison); |
81819f0f CL |
5271 | |
5272 | static ssize_t store_user_show(struct kmem_cache *s, char *buf) | |
5273 | { | |
bf16d19a | 5274 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_STORE_USER)); |
81819f0f CL |
5275 | } |
5276 | ||
ad38b5b1 | 5277 | SLAB_ATTR_RO(store_user); |
81819f0f | 5278 | |
53e15af0 CL |
5279 | static ssize_t validate_show(struct kmem_cache *s, char *buf) |
5280 | { | |
5281 | return 0; | |
5282 | } | |
5283 | ||
5284 | static ssize_t validate_store(struct kmem_cache *s, | |
5285 | const char *buf, size_t length) | |
5286 | { | |
434e245d CL |
5287 | int ret = -EINVAL; |
5288 | ||
5289 | if (buf[0] == '1') { | |
5290 | ret = validate_slab_cache(s); | |
5291 | if (ret >= 0) | |
5292 | ret = length; | |
5293 | } | |
5294 | return ret; | |
53e15af0 CL |
5295 | } |
5296 | SLAB_ATTR(validate); | |
a5a84755 | 5297 | |
a5a84755 CL |
5298 | #endif /* CONFIG_SLUB_DEBUG */ |
5299 | ||
5300 | #ifdef CONFIG_FAILSLAB | |
5301 | static ssize_t failslab_show(struct kmem_cache *s, char *buf) | |
5302 | { | |
bf16d19a | 5303 | return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB)); |
a5a84755 | 5304 | } |
060807f8 | 5305 | SLAB_ATTR_RO(failslab); |
ab4d5ed5 | 5306 | #endif |
53e15af0 | 5307 | |
2086d26a CL |
5308 | static ssize_t shrink_show(struct kmem_cache *s, char *buf) |
5309 | { | |
5310 | return 0; | |
5311 | } | |
5312 | ||
5313 | static ssize_t shrink_store(struct kmem_cache *s, | |
5314 | const char *buf, size_t length) | |
5315 | { | |
832f37f5 | 5316 | if (buf[0] == '1') |
10befea9 | 5317 | kmem_cache_shrink(s); |
832f37f5 | 5318 | else |
2086d26a CL |
5319 | return -EINVAL; |
5320 | return length; | |
5321 | } | |
5322 | SLAB_ATTR(shrink); | |
5323 | ||
81819f0f | 5324 | #ifdef CONFIG_NUMA |
9824601e | 5325 | static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf) |
81819f0f | 5326 | { |
bf16d19a | 5327 | return sysfs_emit(buf, "%u\n", s->remote_node_defrag_ratio / 10); |
81819f0f CL |
5328 | } |
5329 | ||
9824601e | 5330 | static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, |
81819f0f CL |
5331 | const char *buf, size_t length) |
5332 | { | |
eb7235eb | 5333 | unsigned int ratio; |
0121c619 CL |
5334 | int err; |
5335 | ||
eb7235eb | 5336 | err = kstrtouint(buf, 10, &ratio); |
0121c619 CL |
5337 | if (err) |
5338 | return err; | |
eb7235eb AD |
5339 | if (ratio > 100) |
5340 | return -ERANGE; | |
0121c619 | 5341 | |
eb7235eb | 5342 | s->remote_node_defrag_ratio = ratio * 10; |
81819f0f | 5343 | |
81819f0f CL |
5344 | return length; |
5345 | } | |
9824601e | 5346 | SLAB_ATTR(remote_node_defrag_ratio); |
81819f0f CL |
5347 | #endif |
5348 | ||
8ff12cfc | 5349 | #ifdef CONFIG_SLUB_STATS |
8ff12cfc CL |
5350 | static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) |
5351 | { | |
5352 | unsigned long sum = 0; | |
5353 | int cpu; | |
bf16d19a | 5354 | int len = 0; |
6da2ec56 | 5355 | int *data = kmalloc_array(nr_cpu_ids, sizeof(int), GFP_KERNEL); |
8ff12cfc CL |
5356 | |
5357 | if (!data) | |
5358 | return -ENOMEM; | |
5359 | ||
5360 | for_each_online_cpu(cpu) { | |
9dfc6e68 | 5361 | unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; |
8ff12cfc CL |
5362 | |
5363 | data[cpu] = x; | |
5364 | sum += x; | |
5365 | } | |
5366 | ||
bf16d19a | 5367 | len += sysfs_emit_at(buf, len, "%lu", sum); |
8ff12cfc | 5368 | |
50ef37b9 | 5369 | #ifdef CONFIG_SMP |
8ff12cfc | 5370 | for_each_online_cpu(cpu) { |
bf16d19a JP |
5371 | if (data[cpu]) |
5372 | len += sysfs_emit_at(buf, len, " C%d=%u", | |
5373 | cpu, data[cpu]); | |
8ff12cfc | 5374 | } |
50ef37b9 | 5375 | #endif |
8ff12cfc | 5376 | kfree(data); |
bf16d19a JP |
5377 | len += sysfs_emit_at(buf, len, "\n"); |
5378 | ||
5379 | return len; | |
8ff12cfc CL |
5380 | } |
5381 | ||
78eb00cc DR |
5382 | static void clear_stat(struct kmem_cache *s, enum stat_item si) |
5383 | { | |
5384 | int cpu; | |
5385 | ||
5386 | for_each_online_cpu(cpu) | |
9dfc6e68 | 5387 | per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; |
78eb00cc DR |
5388 | } |
5389 | ||
8ff12cfc CL |
5390 | #define STAT_ATTR(si, text) \ |
5391 | static ssize_t text##_show(struct kmem_cache *s, char *buf) \ | |
5392 | { \ | |
5393 | return show_stat(s, buf, si); \ | |
5394 | } \ | |
78eb00cc DR |
5395 | static ssize_t text##_store(struct kmem_cache *s, \ |
5396 | const char *buf, size_t length) \ | |
5397 | { \ | |
5398 | if (buf[0] != '0') \ | |
5399 | return -EINVAL; \ | |
5400 | clear_stat(s, si); \ | |
5401 | return length; \ | |
5402 | } \ | |
5403 | SLAB_ATTR(text); \ | |
8ff12cfc CL |
5404 | |
5405 | STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); | |
5406 | STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); | |
5407 | STAT_ATTR(FREE_FASTPATH, free_fastpath); | |
5408 | STAT_ATTR(FREE_SLOWPATH, free_slowpath); | |
5409 | STAT_ATTR(FREE_FROZEN, free_frozen); | |
5410 | STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); | |
5411 | STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); | |
5412 | STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); | |
5413 | STAT_ATTR(ALLOC_SLAB, alloc_slab); | |
5414 | STAT_ATTR(ALLOC_REFILL, alloc_refill); | |
e36a2652 | 5415 | STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch); |
8ff12cfc CL |
5416 | STAT_ATTR(FREE_SLAB, free_slab); |
5417 | STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); | |
5418 | STAT_ATTR(DEACTIVATE_FULL, deactivate_full); | |
5419 | STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); | |
5420 | STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); | |
5421 | STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); | |
5422 | STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); | |
03e404af | 5423 | STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass); |
65c3376a | 5424 | STAT_ATTR(ORDER_FALLBACK, order_fallback); |
b789ef51 CL |
5425 | STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail); |
5426 | STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail); | |
49e22585 CL |
5427 | STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc); |
5428 | STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free); | |
8028dcea AS |
5429 | STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node); |
5430 | STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain); | |
6dfd1b65 | 5431 | #endif /* CONFIG_SLUB_STATS */ |
8ff12cfc | 5432 | |
06428780 | 5433 | static struct attribute *slab_attrs[] = { |
81819f0f CL |
5434 | &slab_size_attr.attr, |
5435 | &object_size_attr.attr, | |
5436 | &objs_per_slab_attr.attr, | |
5437 | &order_attr.attr, | |
73d342b1 | 5438 | &min_partial_attr.attr, |
49e22585 | 5439 | &cpu_partial_attr.attr, |
81819f0f | 5440 | &objects_attr.attr, |
205ab99d | 5441 | &objects_partial_attr.attr, |
81819f0f CL |
5442 | &partial_attr.attr, |
5443 | &cpu_slabs_attr.attr, | |
5444 | &ctor_attr.attr, | |
81819f0f CL |
5445 | &aliases_attr.attr, |
5446 | &align_attr.attr, | |
81819f0f CL |
5447 | &hwcache_align_attr.attr, |
5448 | &reclaim_account_attr.attr, | |
5449 | &destroy_by_rcu_attr.attr, | |
a5a84755 | 5450 | &shrink_attr.attr, |
49e22585 | 5451 | &slabs_cpu_partial_attr.attr, |
ab4d5ed5 | 5452 | #ifdef CONFIG_SLUB_DEBUG |
a5a84755 CL |
5453 | &total_objects_attr.attr, |
5454 | &slabs_attr.attr, | |
5455 | &sanity_checks_attr.attr, | |
5456 | &trace_attr.attr, | |
81819f0f CL |
5457 | &red_zone_attr.attr, |
5458 | &poison_attr.attr, | |
5459 | &store_user_attr.attr, | |
53e15af0 | 5460 | &validate_attr.attr, |
ab4d5ed5 | 5461 | #endif |
81819f0f CL |
5462 | #ifdef CONFIG_ZONE_DMA |
5463 | &cache_dma_attr.attr, | |
5464 | #endif | |
5465 | #ifdef CONFIG_NUMA | |
9824601e | 5466 | &remote_node_defrag_ratio_attr.attr, |
8ff12cfc CL |
5467 | #endif |
5468 | #ifdef CONFIG_SLUB_STATS | |
5469 | &alloc_fastpath_attr.attr, | |
5470 | &alloc_slowpath_attr.attr, | |
5471 | &free_fastpath_attr.attr, | |
5472 | &free_slowpath_attr.attr, | |
5473 | &free_frozen_attr.attr, | |
5474 | &free_add_partial_attr.attr, | |
5475 | &free_remove_partial_attr.attr, | |
5476 | &alloc_from_partial_attr.attr, | |
5477 | &alloc_slab_attr.attr, | |
5478 | &alloc_refill_attr.attr, | |
e36a2652 | 5479 | &alloc_node_mismatch_attr.attr, |
8ff12cfc CL |
5480 | &free_slab_attr.attr, |
5481 | &cpuslab_flush_attr.attr, | |
5482 | &deactivate_full_attr.attr, | |
5483 | &deactivate_empty_attr.attr, | |
5484 | &deactivate_to_head_attr.attr, | |
5485 | &deactivate_to_tail_attr.attr, | |
5486 | &deactivate_remote_frees_attr.attr, | |
03e404af | 5487 | &deactivate_bypass_attr.attr, |
65c3376a | 5488 | &order_fallback_attr.attr, |
b789ef51 CL |
5489 | &cmpxchg_double_fail_attr.attr, |
5490 | &cmpxchg_double_cpu_fail_attr.attr, | |
49e22585 CL |
5491 | &cpu_partial_alloc_attr.attr, |
5492 | &cpu_partial_free_attr.attr, | |
8028dcea AS |
5493 | &cpu_partial_node_attr.attr, |
5494 | &cpu_partial_drain_attr.attr, | |
81819f0f | 5495 | #endif |
4c13dd3b DM |
5496 | #ifdef CONFIG_FAILSLAB |
5497 | &failslab_attr.attr, | |
5498 | #endif | |
8eb8284b | 5499 | &usersize_attr.attr, |
4c13dd3b | 5500 | |
81819f0f CL |
5501 | NULL |
5502 | }; | |
5503 | ||
1fdaaa23 | 5504 | static const struct attribute_group slab_attr_group = { |
81819f0f CL |
5505 | .attrs = slab_attrs, |
5506 | }; | |
5507 | ||
5508 | static ssize_t slab_attr_show(struct kobject *kobj, | |
5509 | struct attribute *attr, | |
5510 | char *buf) | |
5511 | { | |
5512 | struct slab_attribute *attribute; | |
5513 | struct kmem_cache *s; | |
5514 | int err; | |
5515 | ||
5516 | attribute = to_slab_attr(attr); | |
5517 | s = to_slab(kobj); | |
5518 | ||
5519 | if (!attribute->show) | |
5520 | return -EIO; | |
5521 | ||
5522 | err = attribute->show(s, buf); | |
5523 | ||
5524 | return err; | |
5525 | } | |
5526 | ||
5527 | static ssize_t slab_attr_store(struct kobject *kobj, | |
5528 | struct attribute *attr, | |
5529 | const char *buf, size_t len) | |
5530 | { | |
5531 | struct slab_attribute *attribute; | |
5532 | struct kmem_cache *s; | |
5533 | int err; | |
5534 | ||
5535 | attribute = to_slab_attr(attr); | |
5536 | s = to_slab(kobj); | |
5537 | ||
5538 | if (!attribute->store) | |
5539 | return -EIO; | |
5540 | ||
5541 | err = attribute->store(s, buf, len); | |
81819f0f CL |
5542 | return err; |
5543 | } | |
5544 | ||
41a21285 CL |
5545 | static void kmem_cache_release(struct kobject *k) |
5546 | { | |
5547 | slab_kmem_cache_release(to_slab(k)); | |
5548 | } | |
5549 | ||
52cf25d0 | 5550 | static const struct sysfs_ops slab_sysfs_ops = { |
81819f0f CL |
5551 | .show = slab_attr_show, |
5552 | .store = slab_attr_store, | |
5553 | }; | |
5554 | ||
5555 | static struct kobj_type slab_ktype = { | |
5556 | .sysfs_ops = &slab_sysfs_ops, | |
41a21285 | 5557 | .release = kmem_cache_release, |
81819f0f CL |
5558 | }; |
5559 | ||
27c3a314 | 5560 | static struct kset *slab_kset; |
81819f0f | 5561 | |
9a41707b VD |
5562 | static inline struct kset *cache_kset(struct kmem_cache *s) |
5563 | { | |
9a41707b VD |
5564 | return slab_kset; |
5565 | } | |
5566 | ||
81819f0f CL |
5567 | #define ID_STR_LENGTH 64 |
5568 | ||
5569 | /* Create a unique string id for a slab cache: | |
6446faa2 CL |
5570 | * |
5571 | * Format :[flags-]size | |
81819f0f CL |
5572 | */ |
5573 | static char *create_unique_id(struct kmem_cache *s) | |
5574 | { | |
5575 | char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL); | |
5576 | char *p = name; | |
5577 | ||
5578 | BUG_ON(!name); | |
5579 | ||
5580 | *p++ = ':'; | |
5581 | /* | |
5582 | * First flags affecting slabcache operations. We will only | |
5583 | * get here for aliasable slabs so we do not need to support | |
5584 | * too many flags. The flags here must cover all flags that | |
5585 | * are matched during merging to guarantee that the id is | |
5586 | * unique. | |
5587 | */ | |
5588 | if (s->flags & SLAB_CACHE_DMA) | |
5589 | *p++ = 'd'; | |
6d6ea1e9 NB |
5590 | if (s->flags & SLAB_CACHE_DMA32) |
5591 | *p++ = 'D'; | |
81819f0f CL |
5592 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
5593 | *p++ = 'a'; | |
becfda68 | 5594 | if (s->flags & SLAB_CONSISTENCY_CHECKS) |
81819f0f | 5595 | *p++ = 'F'; |
230e9fc2 VD |
5596 | if (s->flags & SLAB_ACCOUNT) |
5597 | *p++ = 'A'; | |
81819f0f CL |
5598 | if (p != name + 1) |
5599 | *p++ = '-'; | |
44065b2e | 5600 | p += sprintf(p, "%07u", s->size); |
2633d7a0 | 5601 | |
81819f0f CL |
5602 | BUG_ON(p > name + ID_STR_LENGTH - 1); |
5603 | return name; | |
5604 | } | |
5605 | ||
5606 | static int sysfs_slab_add(struct kmem_cache *s) | |
5607 | { | |
5608 | int err; | |
5609 | const char *name; | |
1663f26d | 5610 | struct kset *kset = cache_kset(s); |
45530c44 | 5611 | int unmergeable = slab_unmergeable(s); |
81819f0f | 5612 | |
1663f26d TH |
5613 | if (!kset) { |
5614 | kobject_init(&s->kobj, &slab_ktype); | |
5615 | return 0; | |
5616 | } | |
5617 | ||
11066386 MC |
5618 | if (!unmergeable && disable_higher_order_debug && |
5619 | (slub_debug & DEBUG_METADATA_FLAGS)) | |
5620 | unmergeable = 1; | |
5621 | ||
81819f0f CL |
5622 | if (unmergeable) { |
5623 | /* | |
5624 | * Slabcache can never be merged so we can use the name proper. | |
5625 | * This is typically the case for debug situations. In that | |
5626 | * case we can catch duplicate names easily. | |
5627 | */ | |
27c3a314 | 5628 | sysfs_remove_link(&slab_kset->kobj, s->name); |
81819f0f CL |
5629 | name = s->name; |
5630 | } else { | |
5631 | /* | |
5632 | * Create a unique name for the slab as a target | |
5633 | * for the symlinks. | |
5634 | */ | |
5635 | name = create_unique_id(s); | |
5636 | } | |
5637 | ||
1663f26d | 5638 | s->kobj.kset = kset; |
26e4f205 | 5639 | err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name); |
757fed1d | 5640 | if (err) |
80da026a | 5641 | goto out; |
81819f0f CL |
5642 | |
5643 | err = sysfs_create_group(&s->kobj, &slab_attr_group); | |
54b6a731 DJ |
5644 | if (err) |
5645 | goto out_del_kobj; | |
9a41707b | 5646 | |
81819f0f CL |
5647 | if (!unmergeable) { |
5648 | /* Setup first alias */ | |
5649 | sysfs_slab_alias(s, s->name); | |
81819f0f | 5650 | } |
54b6a731 DJ |
5651 | out: |
5652 | if (!unmergeable) | |
5653 | kfree(name); | |
5654 | return err; | |
5655 | out_del_kobj: | |
5656 | kobject_del(&s->kobj); | |
54b6a731 | 5657 | goto out; |
81819f0f CL |
5658 | } |
5659 | ||
d50d82fa MP |
5660 | void sysfs_slab_unlink(struct kmem_cache *s) |
5661 | { | |
5662 | if (slab_state >= FULL) | |
5663 | kobject_del(&s->kobj); | |
5664 | } | |
5665 | ||
bf5eb3de TH |
5666 | void sysfs_slab_release(struct kmem_cache *s) |
5667 | { | |
5668 | if (slab_state >= FULL) | |
5669 | kobject_put(&s->kobj); | |
81819f0f CL |
5670 | } |
5671 | ||
5672 | /* | |
5673 | * Need to buffer aliases during bootup until sysfs becomes | |
9f6c708e | 5674 | * available lest we lose that information. |
81819f0f CL |
5675 | */ |
5676 | struct saved_alias { | |
5677 | struct kmem_cache *s; | |
5678 | const char *name; | |
5679 | struct saved_alias *next; | |
5680 | }; | |
5681 | ||
5af328a5 | 5682 | static struct saved_alias *alias_list; |
81819f0f CL |
5683 | |
5684 | static int sysfs_slab_alias(struct kmem_cache *s, const char *name) | |
5685 | { | |
5686 | struct saved_alias *al; | |
5687 | ||
97d06609 | 5688 | if (slab_state == FULL) { |
81819f0f CL |
5689 | /* |
5690 | * If we have a leftover link then remove it. | |
5691 | */ | |
27c3a314 GKH |
5692 | sysfs_remove_link(&slab_kset->kobj, name); |
5693 | return sysfs_create_link(&slab_kset->kobj, &s->kobj, name); | |
81819f0f CL |
5694 | } |
5695 | ||
5696 | al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); | |
5697 | if (!al) | |
5698 | return -ENOMEM; | |
5699 | ||
5700 | al->s = s; | |
5701 | al->name = name; | |
5702 | al->next = alias_list; | |
5703 | alias_list = al; | |
5704 | return 0; | |
5705 | } | |
5706 | ||
5707 | static int __init slab_sysfs_init(void) | |
5708 | { | |
5b95a4ac | 5709 | struct kmem_cache *s; |
81819f0f CL |
5710 | int err; |
5711 | ||
18004c5d | 5712 | mutex_lock(&slab_mutex); |
2bce6485 | 5713 | |
d7660ce5 | 5714 | slab_kset = kset_create_and_add("slab", NULL, kernel_kobj); |
27c3a314 | 5715 | if (!slab_kset) { |
18004c5d | 5716 | mutex_unlock(&slab_mutex); |
f9f58285 | 5717 | pr_err("Cannot register slab subsystem.\n"); |
81819f0f CL |
5718 | return -ENOSYS; |
5719 | } | |
5720 | ||
97d06609 | 5721 | slab_state = FULL; |
26a7bd03 | 5722 | |
5b95a4ac | 5723 | list_for_each_entry(s, &slab_caches, list) { |
26a7bd03 | 5724 | err = sysfs_slab_add(s); |
5d540fb7 | 5725 | if (err) |
f9f58285 FF |
5726 | pr_err("SLUB: Unable to add boot slab %s to sysfs\n", |
5727 | s->name); | |
26a7bd03 | 5728 | } |
81819f0f CL |
5729 | |
5730 | while (alias_list) { | |
5731 | struct saved_alias *al = alias_list; | |
5732 | ||
5733 | alias_list = alias_list->next; | |
5734 | err = sysfs_slab_alias(al->s, al->name); | |
5d540fb7 | 5735 | if (err) |
f9f58285 FF |
5736 | pr_err("SLUB: Unable to add boot slab alias %s to sysfs\n", |
5737 | al->name); | |
81819f0f CL |
5738 | kfree(al); |
5739 | } | |
5740 | ||
18004c5d | 5741 | mutex_unlock(&slab_mutex); |
81819f0f CL |
5742 | return 0; |
5743 | } | |
5744 | ||
5745 | __initcall(slab_sysfs_init); | |
ab4d5ed5 | 5746 | #endif /* CONFIG_SYSFS */ |
57ed3eda | 5747 | |
64dd6849 FM |
5748 | #if defined(CONFIG_SLUB_DEBUG) && defined(CONFIG_DEBUG_FS) |
5749 | static int slab_debugfs_show(struct seq_file *seq, void *v) | |
5750 | { | |
5751 | ||
5752 | struct location *l; | |
5753 | unsigned int idx = *(unsigned int *)v; | |
5754 | struct loc_track *t = seq->private; | |
5755 | ||
5756 | if (idx < t->count) { | |
5757 | l = &t->loc[idx]; | |
5758 | ||
5759 | seq_printf(seq, "%7ld ", l->count); | |
5760 | ||
5761 | if (l->addr) | |
5762 | seq_printf(seq, "%pS", (void *)l->addr); | |
5763 | else | |
5764 | seq_puts(seq, "<not-available>"); | |
5765 | ||
5766 | if (l->sum_time != l->min_time) { | |
5767 | seq_printf(seq, " age=%ld/%llu/%ld", | |
5768 | l->min_time, div_u64(l->sum_time, l->count), | |
5769 | l->max_time); | |
5770 | } else | |
5771 | seq_printf(seq, " age=%ld", l->min_time); | |
5772 | ||
5773 | if (l->min_pid != l->max_pid) | |
5774 | seq_printf(seq, " pid=%ld-%ld", l->min_pid, l->max_pid); | |
5775 | else | |
5776 | seq_printf(seq, " pid=%ld", | |
5777 | l->min_pid); | |
5778 | ||
5779 | if (num_online_cpus() > 1 && !cpumask_empty(to_cpumask(l->cpus))) | |
5780 | seq_printf(seq, " cpus=%*pbl", | |
5781 | cpumask_pr_args(to_cpumask(l->cpus))); | |
5782 | ||
5783 | if (nr_online_nodes > 1 && !nodes_empty(l->nodes)) | |
5784 | seq_printf(seq, " nodes=%*pbl", | |
5785 | nodemask_pr_args(&l->nodes)); | |
5786 | ||
5787 | seq_puts(seq, "\n"); | |
5788 | } | |
5789 | ||
5790 | if (!idx && !t->count) | |
5791 | seq_puts(seq, "No data\n"); | |
5792 | ||
5793 | return 0; | |
5794 | } | |
5795 | ||
5796 | static void slab_debugfs_stop(struct seq_file *seq, void *v) | |
5797 | { | |
5798 | } | |
5799 | ||
5800 | static void *slab_debugfs_next(struct seq_file *seq, void *v, loff_t *ppos) | |
5801 | { | |
5802 | struct loc_track *t = seq->private; | |
5803 | ||
5804 | v = ppos; | |
5805 | ++*ppos; | |
5806 | if (*ppos <= t->count) | |
5807 | return v; | |
5808 | ||
5809 | return NULL; | |
5810 | } | |
5811 | ||
5812 | static void *slab_debugfs_start(struct seq_file *seq, loff_t *ppos) | |
5813 | { | |
5814 | return ppos; | |
5815 | } | |
5816 | ||
5817 | static const struct seq_operations slab_debugfs_sops = { | |
5818 | .start = slab_debugfs_start, | |
5819 | .next = slab_debugfs_next, | |
5820 | .stop = slab_debugfs_stop, | |
5821 | .show = slab_debugfs_show, | |
5822 | }; | |
5823 | ||
5824 | static int slab_debug_trace_open(struct inode *inode, struct file *filep) | |
5825 | { | |
5826 | ||
5827 | struct kmem_cache_node *n; | |
5828 | enum track_item alloc; | |
5829 | int node; | |
5830 | struct loc_track *t = __seq_open_private(filep, &slab_debugfs_sops, | |
5831 | sizeof(struct loc_track)); | |
5832 | struct kmem_cache *s = file_inode(filep)->i_private; | |
5833 | ||
5834 | if (strcmp(filep->f_path.dentry->d_name.name, "alloc_traces") == 0) | |
5835 | alloc = TRACK_ALLOC; | |
5836 | else | |
5837 | alloc = TRACK_FREE; | |
5838 | ||
5839 | if (!alloc_loc_track(t, PAGE_SIZE / sizeof(struct location), GFP_KERNEL)) | |
5840 | return -ENOMEM; | |
5841 | ||
5842 | /* Push back cpu slabs */ | |
5843 | flush_all(s); | |
5844 | ||
5845 | for_each_kmem_cache_node(s, node, n) { | |
5846 | unsigned long flags; | |
5847 | struct page *page; | |
5848 | ||
5849 | if (!atomic_long_read(&n->nr_slabs)) | |
5850 | continue; | |
5851 | ||
5852 | spin_lock_irqsave(&n->list_lock, flags); | |
5853 | list_for_each_entry(page, &n->partial, slab_list) | |
5854 | process_slab(t, s, page, alloc); | |
5855 | list_for_each_entry(page, &n->full, slab_list) | |
5856 | process_slab(t, s, page, alloc); | |
5857 | spin_unlock_irqrestore(&n->list_lock, flags); | |
5858 | } | |
5859 | ||
5860 | return 0; | |
5861 | } | |
5862 | ||
5863 | static int slab_debug_trace_release(struct inode *inode, struct file *file) | |
5864 | { | |
5865 | struct seq_file *seq = file->private_data; | |
5866 | struct loc_track *t = seq->private; | |
5867 | ||
5868 | free_loc_track(t); | |
5869 | return seq_release_private(inode, file); | |
5870 | } | |
5871 | ||
5872 | static const struct file_operations slab_debugfs_fops = { | |
5873 | .open = slab_debug_trace_open, | |
5874 | .read = seq_read, | |
5875 | .llseek = seq_lseek, | |
5876 | .release = slab_debug_trace_release, | |
5877 | }; | |
5878 | ||
5879 | static void debugfs_slab_add(struct kmem_cache *s) | |
5880 | { | |
5881 | struct dentry *slab_cache_dir; | |
5882 | ||
5883 | if (unlikely(!slab_debugfs_root)) | |
5884 | return; | |
5885 | ||
5886 | slab_cache_dir = debugfs_create_dir(s->name, slab_debugfs_root); | |
5887 | ||
5888 | debugfs_create_file("alloc_traces", 0400, | |
5889 | slab_cache_dir, s, &slab_debugfs_fops); | |
5890 | ||
5891 | debugfs_create_file("free_traces", 0400, | |
5892 | slab_cache_dir, s, &slab_debugfs_fops); | |
5893 | } | |
5894 | ||
5895 | void debugfs_slab_release(struct kmem_cache *s) | |
5896 | { | |
5897 | debugfs_remove_recursive(debugfs_lookup(s->name, slab_debugfs_root)); | |
5898 | } | |
5899 | ||
5900 | static int __init slab_debugfs_init(void) | |
5901 | { | |
5902 | struct kmem_cache *s; | |
5903 | ||
5904 | slab_debugfs_root = debugfs_create_dir("slab", NULL); | |
5905 | ||
5906 | list_for_each_entry(s, &slab_caches, list) | |
5907 | if (s->flags & SLAB_STORE_USER) | |
5908 | debugfs_slab_add(s); | |
5909 | ||
5910 | return 0; | |
5911 | ||
5912 | } | |
5913 | __initcall(slab_debugfs_init); | |
5914 | #endif | |
57ed3eda PE |
5915 | /* |
5916 | * The /proc/slabinfo ABI | |
5917 | */ | |
5b365771 | 5918 | #ifdef CONFIG_SLUB_DEBUG |
0d7561c6 | 5919 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo) |
57ed3eda | 5920 | { |
57ed3eda | 5921 | unsigned long nr_slabs = 0; |
205ab99d CL |
5922 | unsigned long nr_objs = 0; |
5923 | unsigned long nr_free = 0; | |
57ed3eda | 5924 | int node; |
fa45dc25 | 5925 | struct kmem_cache_node *n; |
57ed3eda | 5926 | |
fa45dc25 | 5927 | for_each_kmem_cache_node(s, node, n) { |
c17fd13e WL |
5928 | nr_slabs += node_nr_slabs(n); |
5929 | nr_objs += node_nr_objs(n); | |
205ab99d | 5930 | nr_free += count_partial(n, count_free); |
57ed3eda PE |
5931 | } |
5932 | ||
0d7561c6 GC |
5933 | sinfo->active_objs = nr_objs - nr_free; |
5934 | sinfo->num_objs = nr_objs; | |
5935 | sinfo->active_slabs = nr_slabs; | |
5936 | sinfo->num_slabs = nr_slabs; | |
5937 | sinfo->objects_per_slab = oo_objects(s->oo); | |
5938 | sinfo->cache_order = oo_order(s->oo); | |
57ed3eda PE |
5939 | } |
5940 | ||
0d7561c6 | 5941 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s) |
7b3c3a50 | 5942 | { |
7b3c3a50 AD |
5943 | } |
5944 | ||
b7454ad3 GC |
5945 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
5946 | size_t count, loff_t *ppos) | |
7b3c3a50 | 5947 | { |
b7454ad3 | 5948 | return -EIO; |
7b3c3a50 | 5949 | } |
5b365771 | 5950 | #endif /* CONFIG_SLUB_DEBUG */ |