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716154c5 BB |
1 | /*****************************************************************************\ |
2 | * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. | |
3 | * Copyright (C) 2007 The Regents of the University of California. | |
4 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
5 | * Written by Brian Behlendorf <behlendorf1@llnl.gov>. | |
715f6251 BB |
6 | * UCRL-CODE-235197 |
7 | * | |
716154c5 | 8 | * This file is part of the SPL, Solaris Porting Layer. |
3d6af2dd | 9 | * For details, see <http://zfsonlinux.org/>. |
715f6251 | 10 | * |
716154c5 BB |
11 | * The SPL is free software; you can redistribute it and/or modify it |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | * | |
16 | * The SPL is distributed in the hope that it will be useful, but WITHOUT | |
715f6251 BB |
17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | * for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
716154c5 BB |
22 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. |
23 | ***************************************************************************** | |
24 | * Solaris Porting Layer (SPL) Kmem Implementation. | |
25 | \*****************************************************************************/ | |
715f6251 | 26 | |
f4b37741 | 27 | #include <sys/kmem.h> |
55abb092 | 28 | #include <spl-debug.h> |
f1ca4da6 | 29 | |
b17edc10 BB |
30 | #ifdef SS_DEBUG_SUBSYS |
31 | #undef SS_DEBUG_SUBSYS | |
937879f1 BB |
32 | #endif |
33 | ||
b17edc10 | 34 | #define SS_DEBUG_SUBSYS SS_KMEM |
937879f1 | 35 | |
0936c344 BB |
36 | /* |
37 | * Cache expiration was implemented because it was part of the default Solaris | |
38 | * kmem_cache behavior. The idea is that per-cpu objects which haven't been | |
39 | * accessed in several seconds should be returned to the cache. On the other | |
40 | * hand Linux slabs never move objects back to the slabs unless there is | |
41 | * memory pressure on the system. By default both methods are disabled, but | |
42 | * may be enabled by setting KMC_EXPIRE_AGE or KMC_EXPIRE_MEM. | |
43 | */ | |
44 | unsigned int spl_kmem_cache_expire = 0; | |
45 | EXPORT_SYMBOL(spl_kmem_cache_expire); | |
46 | module_param(spl_kmem_cache_expire, uint, 0644); | |
47 | MODULE_PARM_DESC(spl_kmem_cache_expire, "By age (0x1) or low memory (0x2)"); | |
48 | ||
36b313da BB |
49 | /* |
50 | * The minimum amount of memory measured in pages to be free at all | |
51 | * times on the system. This is similar to Linux's zone->pages_min | |
ecc39810 | 52 | * multiplied by the number of zones and is sized based on that. |
36b313da BB |
53 | */ |
54 | pgcnt_t minfree = 0; | |
55 | EXPORT_SYMBOL(minfree); | |
56 | ||
57 | /* | |
58 | * The desired amount of memory measured in pages to be free at all | |
59 | * times on the system. This is similar to Linux's zone->pages_low | |
ecc39810 | 60 | * multiplied by the number of zones and is sized based on that. |
36b313da | 61 | * Assuming all zones are being used roughly equally, when we drop |
ecc39810 | 62 | * below this threshold asynchronous page reclamation is triggered. |
36b313da BB |
63 | */ |
64 | pgcnt_t desfree = 0; | |
65 | EXPORT_SYMBOL(desfree); | |
66 | ||
67 | /* | |
68 | * When above this amount of memory measures in pages the system is | |
69 | * determined to have enough free memory. This is similar to Linux's | |
ecc39810 | 70 | * zone->pages_high multiplied by the number of zones and is sized based |
36b313da | 71 | * on that. Assuming all zones are being used roughly equally, when |
ecc39810 | 72 | * asynchronous page reclamation reaches this threshold it stops. |
36b313da BB |
73 | */ |
74 | pgcnt_t lotsfree = 0; | |
75 | EXPORT_SYMBOL(lotsfree); | |
76 | ||
77 | /* Unused always 0 in this implementation */ | |
78 | pgcnt_t needfree = 0; | |
79 | EXPORT_SYMBOL(needfree); | |
80 | ||
36b313da BB |
81 | pgcnt_t swapfs_minfree = 0; |
82 | EXPORT_SYMBOL(swapfs_minfree); | |
83 | ||
84 | pgcnt_t swapfs_reserve = 0; | |
85 | EXPORT_SYMBOL(swapfs_reserve); | |
86 | ||
36b313da BB |
87 | vmem_t *heap_arena = NULL; |
88 | EXPORT_SYMBOL(heap_arena); | |
89 | ||
90 | vmem_t *zio_alloc_arena = NULL; | |
91 | EXPORT_SYMBOL(zio_alloc_arena); | |
92 | ||
93 | vmem_t *zio_arena = NULL; | |
94 | EXPORT_SYMBOL(zio_arena); | |
95 | ||
d1ff2312 | 96 | #ifndef HAVE_GET_VMALLOC_INFO |
96dded38 | 97 | get_vmalloc_info_t get_vmalloc_info_fn = SYMBOL_POISON; |
d1ff2312 BB |
98 | EXPORT_SYMBOL(get_vmalloc_info_fn); |
99 | #endif /* HAVE_GET_VMALLOC_INFO */ | |
100 | ||
5232d256 BB |
101 | #ifdef HAVE_PGDAT_HELPERS |
102 | # ifndef HAVE_FIRST_ONLINE_PGDAT | |
96dded38 | 103 | first_online_pgdat_t first_online_pgdat_fn = SYMBOL_POISON; |
d1ff2312 | 104 | EXPORT_SYMBOL(first_online_pgdat_fn); |
5232d256 | 105 | # endif /* HAVE_FIRST_ONLINE_PGDAT */ |
36b313da | 106 | |
5232d256 | 107 | # ifndef HAVE_NEXT_ONLINE_PGDAT |
96dded38 | 108 | next_online_pgdat_t next_online_pgdat_fn = SYMBOL_POISON; |
d1ff2312 | 109 | EXPORT_SYMBOL(next_online_pgdat_fn); |
5232d256 | 110 | # endif /* HAVE_NEXT_ONLINE_PGDAT */ |
36b313da | 111 | |
5232d256 | 112 | # ifndef HAVE_NEXT_ZONE |
96dded38 | 113 | next_zone_t next_zone_fn = SYMBOL_POISON; |
d1ff2312 | 114 | EXPORT_SYMBOL(next_zone_fn); |
5232d256 BB |
115 | # endif /* HAVE_NEXT_ZONE */ |
116 | ||
117 | #else /* HAVE_PGDAT_HELPERS */ | |
118 | ||
119 | # ifndef HAVE_PGDAT_LIST | |
120 | struct pglist_data *pgdat_list_addr = SYMBOL_POISON; | |
121 | EXPORT_SYMBOL(pgdat_list_addr); | |
122 | # endif /* HAVE_PGDAT_LIST */ | |
123 | ||
124 | #endif /* HAVE_PGDAT_HELPERS */ | |
36b313da | 125 | |
6ae7fef5 | 126 | #ifdef NEED_GET_ZONE_COUNTS |
e11d6c5f | 127 | # ifndef HAVE_GET_ZONE_COUNTS |
96dded38 | 128 | get_zone_counts_t get_zone_counts_fn = SYMBOL_POISON; |
d1ff2312 | 129 | EXPORT_SYMBOL(get_zone_counts_fn); |
96dded38 | 130 | # endif /* HAVE_GET_ZONE_COUNTS */ |
4ab13d3b | 131 | |
e11d6c5f | 132 | unsigned long |
6ae7fef5 | 133 | spl_global_page_state(spl_zone_stat_item_t item) |
4ab13d3b BB |
134 | { |
135 | unsigned long active; | |
136 | unsigned long inactive; | |
137 | unsigned long free; | |
138 | ||
6ae7fef5 BB |
139 | get_zone_counts(&active, &inactive, &free); |
140 | switch (item) { | |
141 | case SPL_NR_FREE_PAGES: return free; | |
142 | case SPL_NR_INACTIVE: return inactive; | |
143 | case SPL_NR_ACTIVE: return active; | |
144 | default: ASSERT(0); /* Unsupported */ | |
e11d6c5f BB |
145 | } |
146 | ||
6ae7fef5 BB |
147 | return 0; |
148 | } | |
149 | #else | |
150 | # ifdef HAVE_GLOBAL_PAGE_STATE | |
151 | unsigned long | |
152 | spl_global_page_state(spl_zone_stat_item_t item) | |
153 | { | |
154 | unsigned long pages = 0; | |
155 | ||
156 | switch (item) { | |
157 | case SPL_NR_FREE_PAGES: | |
158 | # ifdef HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES | |
159 | pages += global_page_state(NR_FREE_PAGES); | |
160 | # endif | |
161 | break; | |
162 | case SPL_NR_INACTIVE: | |
163 | # ifdef HAVE_ZONE_STAT_ITEM_NR_INACTIVE | |
164 | pages += global_page_state(NR_INACTIVE); | |
165 | # endif | |
166 | # ifdef HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON | |
167 | pages += global_page_state(NR_INACTIVE_ANON); | |
168 | # endif | |
169 | # ifdef HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE | |
170 | pages += global_page_state(NR_INACTIVE_FILE); | |
171 | # endif | |
172 | break; | |
173 | case SPL_NR_ACTIVE: | |
174 | # ifdef HAVE_ZONE_STAT_ITEM_NR_ACTIVE | |
175 | pages += global_page_state(NR_ACTIVE); | |
176 | # endif | |
177 | # ifdef HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON | |
178 | pages += global_page_state(NR_ACTIVE_ANON); | |
179 | # endif | |
180 | # ifdef HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE | |
181 | pages += global_page_state(NR_ACTIVE_FILE); | |
182 | # endif | |
183 | break; | |
184 | default: | |
185 | ASSERT(0); /* Unsupported */ | |
e11d6c5f BB |
186 | } |
187 | ||
6ae7fef5 BB |
188 | return pages; |
189 | } | |
96dded38 | 190 | # else |
6ae7fef5 | 191 | # error "Both global_page_state() and get_zone_counts() unavailable" |
96dded38 | 192 | # endif /* HAVE_GLOBAL_PAGE_STATE */ |
6ae7fef5 | 193 | #endif /* NEED_GET_ZONE_COUNTS */ |
e11d6c5f | 194 | EXPORT_SYMBOL(spl_global_page_state); |
4ab13d3b | 195 | |
e76f4bf1 BB |
196 | #ifndef HAVE_SHRINK_DCACHE_MEMORY |
197 | shrink_dcache_memory_t shrink_dcache_memory_fn = SYMBOL_POISON; | |
198 | EXPORT_SYMBOL(shrink_dcache_memory_fn); | |
199 | #endif /* HAVE_SHRINK_DCACHE_MEMORY */ | |
200 | ||
201 | #ifndef HAVE_SHRINK_ICACHE_MEMORY | |
202 | shrink_icache_memory_t shrink_icache_memory_fn = SYMBOL_POISON; | |
203 | EXPORT_SYMBOL(shrink_icache_memory_fn); | |
204 | #endif /* HAVE_SHRINK_ICACHE_MEMORY */ | |
205 | ||
e11d6c5f BB |
206 | pgcnt_t |
207 | spl_kmem_availrmem(void) | |
208 | { | |
4ab13d3b | 209 | /* The amount of easily available memory */ |
6ae7fef5 BB |
210 | return (spl_global_page_state(SPL_NR_FREE_PAGES) + |
211 | spl_global_page_state(SPL_NR_INACTIVE)); | |
4ab13d3b BB |
212 | } |
213 | EXPORT_SYMBOL(spl_kmem_availrmem); | |
214 | ||
215 | size_t | |
216 | vmem_size(vmem_t *vmp, int typemask) | |
217 | { | |
d1ff2312 BB |
218 | struct vmalloc_info vmi; |
219 | size_t size = 0; | |
220 | ||
4ab13d3b BB |
221 | ASSERT(vmp == NULL); |
222 | ASSERT(typemask & (VMEM_ALLOC | VMEM_FREE)); | |
223 | ||
d1ff2312 BB |
224 | get_vmalloc_info(&vmi); |
225 | if (typemask & VMEM_ALLOC) | |
226 | size += (size_t)vmi.used; | |
227 | ||
228 | if (typemask & VMEM_FREE) | |
229 | size += (size_t)(VMALLOC_TOTAL - vmi.used); | |
230 | ||
231 | return size; | |
4ab13d3b BB |
232 | } |
233 | EXPORT_SYMBOL(vmem_size); | |
4ab13d3b | 234 | |
b868e22f BB |
235 | int |
236 | kmem_debugging(void) | |
237 | { | |
238 | return 0; | |
239 | } | |
240 | EXPORT_SYMBOL(kmem_debugging); | |
241 | ||
242 | #ifndef HAVE_KVASPRINTF | |
243 | /* Simplified asprintf. */ | |
244 | char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap) | |
245 | { | |
246 | unsigned int len; | |
247 | char *p; | |
248 | va_list aq; | |
249 | ||
250 | va_copy(aq, ap); | |
251 | len = vsnprintf(NULL, 0, fmt, aq); | |
252 | va_end(aq); | |
253 | ||
254 | p = kmalloc(len+1, gfp); | |
255 | if (!p) | |
256 | return NULL; | |
257 | ||
258 | vsnprintf(p, len+1, fmt, ap); | |
259 | ||
260 | return p; | |
261 | } | |
262 | EXPORT_SYMBOL(kvasprintf); | |
263 | #endif /* HAVE_KVASPRINTF */ | |
264 | ||
e6de04b7 BB |
265 | char * |
266 | kmem_vasprintf(const char *fmt, va_list ap) | |
267 | { | |
268 | va_list aq; | |
269 | char *ptr; | |
270 | ||
e6de04b7 | 271 | do { |
2c762de8 | 272 | va_copy(aq, ap); |
e6de04b7 | 273 | ptr = kvasprintf(GFP_KERNEL, fmt, aq); |
2c762de8 | 274 | va_end(aq); |
e6de04b7 | 275 | } while (ptr == NULL); |
e6de04b7 BB |
276 | |
277 | return ptr; | |
278 | } | |
279 | EXPORT_SYMBOL(kmem_vasprintf); | |
280 | ||
b868e22f BB |
281 | char * |
282 | kmem_asprintf(const char *fmt, ...) | |
283 | { | |
e6de04b7 | 284 | va_list ap; |
b868e22f BB |
285 | char *ptr; |
286 | ||
b868e22f | 287 | do { |
2c762de8 | 288 | va_start(ap, fmt); |
e6de04b7 | 289 | ptr = kvasprintf(GFP_KERNEL, fmt, ap); |
2c762de8 | 290 | va_end(ap); |
b868e22f | 291 | } while (ptr == NULL); |
b868e22f BB |
292 | |
293 | return ptr; | |
294 | } | |
295 | EXPORT_SYMBOL(kmem_asprintf); | |
296 | ||
10129680 BB |
297 | static char * |
298 | __strdup(const char *str, int flags) | |
299 | { | |
300 | char *ptr; | |
301 | int n; | |
302 | ||
303 | n = strlen(str); | |
304 | ptr = kmalloc_nofail(n + 1, flags); | |
305 | if (ptr) | |
306 | memcpy(ptr, str, n + 1); | |
307 | ||
308 | return ptr; | |
309 | } | |
310 | ||
311 | char * | |
312 | strdup(const char *str) | |
313 | { | |
314 | return __strdup(str, KM_SLEEP); | |
315 | } | |
316 | EXPORT_SYMBOL(strdup); | |
317 | ||
318 | void | |
319 | strfree(char *str) | |
320 | { | |
41f84a8d | 321 | kfree(str); |
10129680 BB |
322 | } |
323 | EXPORT_SYMBOL(strfree); | |
324 | ||
f1ca4da6 | 325 | /* |
2fb9b26a | 326 | * Memory allocation interfaces and debugging for basic kmem_* |
055ffd98 BB |
327 | * and vmem_* style memory allocation. When DEBUG_KMEM is enabled |
328 | * the SPL will keep track of the total memory allocated, and | |
329 | * report any memory leaked when the module is unloaded. | |
f1ca4da6 BB |
330 | */ |
331 | #ifdef DEBUG_KMEM | |
d04c8a56 | 332 | |
f1ca4da6 | 333 | /* Shim layer memory accounting */ |
d04c8a56 | 334 | # ifdef HAVE_ATOMIC64_T |
550f1705 | 335 | atomic64_t kmem_alloc_used = ATOMIC64_INIT(0); |
a0f6da3d | 336 | unsigned long long kmem_alloc_max = 0; |
550f1705 | 337 | atomic64_t vmem_alloc_used = ATOMIC64_INIT(0); |
a0f6da3d | 338 | unsigned long long vmem_alloc_max = 0; |
10129680 | 339 | # else /* HAVE_ATOMIC64_T */ |
d04c8a56 BB |
340 | atomic_t kmem_alloc_used = ATOMIC_INIT(0); |
341 | unsigned long long kmem_alloc_max = 0; | |
342 | atomic_t vmem_alloc_used = ATOMIC_INIT(0); | |
343 | unsigned long long vmem_alloc_max = 0; | |
10129680 | 344 | # endif /* HAVE_ATOMIC64_T */ |
79b31f36 | 345 | |
ff449ac4 BB |
346 | EXPORT_SYMBOL(kmem_alloc_used); |
347 | EXPORT_SYMBOL(kmem_alloc_max); | |
348 | EXPORT_SYMBOL(vmem_alloc_used); | |
349 | EXPORT_SYMBOL(vmem_alloc_max); | |
ff449ac4 | 350 | |
055ffd98 BB |
351 | /* When DEBUG_KMEM_TRACKING is enabled not only will total bytes be tracked |
352 | * but also the location of every alloc and free. When the SPL module is | |
353 | * unloaded a list of all leaked addresses and where they were allocated | |
354 | * will be dumped to the console. Enabling this feature has a significant | |
355 | * impact on performance but it makes finding memory leaks straight forward. | |
356 | * | |
357 | * Not surprisingly with debugging enabled the xmem_locks are very highly | |
358 | * contended particularly on xfree(). If we want to run with this detailed | |
359 | * debugging enabled for anything other than debugging we need to minimize | |
360 | * the contention by moving to a lock per xmem_table entry model. | |
a0f6da3d | 361 | */ |
055ffd98 | 362 | # ifdef DEBUG_KMEM_TRACKING |
a0f6da3d BB |
363 | |
364 | # define KMEM_HASH_BITS 10 | |
365 | # define KMEM_TABLE_SIZE (1 << KMEM_HASH_BITS) | |
366 | ||
367 | # define VMEM_HASH_BITS 10 | |
368 | # define VMEM_TABLE_SIZE (1 << VMEM_HASH_BITS) | |
369 | ||
370 | typedef struct kmem_debug { | |
371 | struct hlist_node kd_hlist; /* Hash node linkage */ | |
372 | struct list_head kd_list; /* List of all allocations */ | |
373 | void *kd_addr; /* Allocation pointer */ | |
374 | size_t kd_size; /* Allocation size */ | |
375 | const char *kd_func; /* Allocation function */ | |
376 | int kd_line; /* Allocation line */ | |
377 | } kmem_debug_t; | |
378 | ||
d6a26c6a BB |
379 | spinlock_t kmem_lock; |
380 | struct hlist_head kmem_table[KMEM_TABLE_SIZE]; | |
381 | struct list_head kmem_list; | |
382 | ||
13cdca65 BB |
383 | spinlock_t vmem_lock; |
384 | struct hlist_head vmem_table[VMEM_TABLE_SIZE]; | |
385 | struct list_head vmem_list; | |
386 | ||
d6a26c6a BB |
387 | EXPORT_SYMBOL(kmem_lock); |
388 | EXPORT_SYMBOL(kmem_table); | |
389 | EXPORT_SYMBOL(kmem_list); | |
390 | ||
13cdca65 BB |
391 | EXPORT_SYMBOL(vmem_lock); |
392 | EXPORT_SYMBOL(vmem_table); | |
393 | EXPORT_SYMBOL(vmem_list); | |
a0f6da3d BB |
394 | |
395 | static kmem_debug_t * | |
973e8269 | 396 | kmem_del_init(spinlock_t *lock, struct hlist_head *table, int bits, const void *addr) |
a0f6da3d BB |
397 | { |
398 | struct hlist_head *head; | |
399 | struct hlist_node *node; | |
400 | struct kmem_debug *p; | |
401 | unsigned long flags; | |
b17edc10 | 402 | SENTRY; |
a0f6da3d BB |
403 | |
404 | spin_lock_irqsave(lock, flags); | |
405 | ||
406 | head = &table[hash_ptr(addr, bits)]; | |
407 | hlist_for_each_entry_rcu(p, node, head, kd_hlist) { | |
408 | if (p->kd_addr == addr) { | |
409 | hlist_del_init(&p->kd_hlist); | |
410 | list_del_init(&p->kd_list); | |
411 | spin_unlock_irqrestore(lock, flags); | |
412 | return p; | |
413 | } | |
414 | } | |
415 | ||
416 | spin_unlock_irqrestore(lock, flags); | |
417 | ||
b17edc10 | 418 | SRETURN(NULL); |
a0f6da3d BB |
419 | } |
420 | ||
421 | void * | |
422 | kmem_alloc_track(size_t size, int flags, const char *func, int line, | |
423 | int node_alloc, int node) | |
424 | { | |
425 | void *ptr = NULL; | |
426 | kmem_debug_t *dptr; | |
427 | unsigned long irq_flags; | |
b17edc10 | 428 | SENTRY; |
a0f6da3d | 429 | |
10129680 | 430 | /* Function may be called with KM_NOSLEEP so failure is possible */ |
c89fdee4 | 431 | dptr = (kmem_debug_t *) kmalloc_nofail(sizeof(kmem_debug_t), |
a0f6da3d BB |
432 | flags & ~__GFP_ZERO); |
433 | ||
10129680 | 434 | if (unlikely(dptr == NULL)) { |
b17edc10 | 435 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, "debug " |
3cb77549 BB |
436 | "kmem_alloc(%ld, 0x%x) at %s:%d failed (%lld/%llu)\n", |
437 | sizeof(kmem_debug_t), flags, func, line, | |
438 | kmem_alloc_used_read(), kmem_alloc_max); | |
a0f6da3d | 439 | } else { |
10129680 BB |
440 | /* |
441 | * Marked unlikely because we should never be doing this, | |
442 | * we tolerate to up 2 pages but a single page is best. | |
443 | */ | |
23d91792 | 444 | if (unlikely((size > PAGE_SIZE*2) && !(flags & KM_NODEBUG))) { |
b17edc10 | 445 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, "large " |
3cb77549 BB |
446 | "kmem_alloc(%llu, 0x%x) at %s:%d (%lld/%llu)\n", |
447 | (unsigned long long) size, flags, func, line, | |
d04c8a56 | 448 | kmem_alloc_used_read(), kmem_alloc_max); |
5198ea0e BB |
449 | spl_debug_dumpstack(NULL); |
450 | } | |
a0f6da3d | 451 | |
10129680 BB |
452 | /* |
453 | * We use __strdup() below because the string pointed to by | |
c8e60837 | 454 | * __FUNCTION__ might not be available by the time we want |
10129680 BB |
455 | * to print it since the module might have been unloaded. |
456 | * This can only fail in the KM_NOSLEEP case. | |
457 | */ | |
458 | dptr->kd_func = __strdup(func, flags & ~__GFP_ZERO); | |
c8e60837 BB |
459 | if (unlikely(dptr->kd_func == NULL)) { |
460 | kfree(dptr); | |
b17edc10 | 461 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, |
10129680 | 462 | "debug __strdup() at %s:%d failed (%lld/%llu)\n", |
3cb77549 | 463 | func, line, kmem_alloc_used_read(), kmem_alloc_max); |
c8e60837 BB |
464 | goto out; |
465 | } | |
466 | ||
a0f6da3d BB |
467 | /* Use the correct allocator */ |
468 | if (node_alloc) { | |
469 | ASSERT(!(flags & __GFP_ZERO)); | |
c89fdee4 | 470 | ptr = kmalloc_node_nofail(size, flags, node); |
a0f6da3d | 471 | } else if (flags & __GFP_ZERO) { |
c89fdee4 | 472 | ptr = kzalloc_nofail(size, flags & ~__GFP_ZERO); |
a0f6da3d | 473 | } else { |
c89fdee4 | 474 | ptr = kmalloc_nofail(size, flags); |
a0f6da3d BB |
475 | } |
476 | ||
477 | if (unlikely(ptr == NULL)) { | |
c8e60837 | 478 | kfree(dptr->kd_func); |
a0f6da3d | 479 | kfree(dptr); |
b17edc10 | 480 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, "kmem_alloc" |
3cb77549 BB |
481 | "(%llu, 0x%x) at %s:%d failed (%lld/%llu)\n", |
482 | (unsigned long long) size, flags, func, line, | |
d04c8a56 | 483 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d BB |
484 | goto out; |
485 | } | |
486 | ||
d04c8a56 BB |
487 | kmem_alloc_used_add(size); |
488 | if (unlikely(kmem_alloc_used_read() > kmem_alloc_max)) | |
489 | kmem_alloc_max = kmem_alloc_used_read(); | |
a0f6da3d BB |
490 | |
491 | INIT_HLIST_NODE(&dptr->kd_hlist); | |
492 | INIT_LIST_HEAD(&dptr->kd_list); | |
493 | ||
494 | dptr->kd_addr = ptr; | |
495 | dptr->kd_size = size; | |
a0f6da3d BB |
496 | dptr->kd_line = line; |
497 | ||
498 | spin_lock_irqsave(&kmem_lock, irq_flags); | |
499 | hlist_add_head_rcu(&dptr->kd_hlist, | |
500 | &kmem_table[hash_ptr(ptr, KMEM_HASH_BITS)]); | |
501 | list_add_tail(&dptr->kd_list, &kmem_list); | |
502 | spin_unlock_irqrestore(&kmem_lock, irq_flags); | |
503 | ||
b17edc10 | 504 | SDEBUG_LIMIT(SD_INFO, |
3cb77549 BB |
505 | "kmem_alloc(%llu, 0x%x) at %s:%d = %p (%lld/%llu)\n", |
506 | (unsigned long long) size, flags, func, line, ptr, | |
507 | kmem_alloc_used_read(), kmem_alloc_max); | |
a0f6da3d BB |
508 | } |
509 | out: | |
b17edc10 | 510 | SRETURN(ptr); |
a0f6da3d BB |
511 | } |
512 | EXPORT_SYMBOL(kmem_alloc_track); | |
513 | ||
514 | void | |
973e8269 | 515 | kmem_free_track(const void *ptr, size_t size) |
a0f6da3d BB |
516 | { |
517 | kmem_debug_t *dptr; | |
b17edc10 | 518 | SENTRY; |
a0f6da3d BB |
519 | |
520 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
521 | (unsigned long long) size); | |
522 | ||
523 | dptr = kmem_del_init(&kmem_lock, kmem_table, KMEM_HASH_BITS, ptr); | |
524 | ||
10129680 BB |
525 | /* Must exist in hash due to kmem_alloc() */ |
526 | ASSERT(dptr); | |
a0f6da3d BB |
527 | |
528 | /* Size must match */ | |
529 | ASSERTF(dptr->kd_size == size, "kd_size (%llu) != size (%llu), " | |
530 | "kd_func = %s, kd_line = %d\n", (unsigned long long) dptr->kd_size, | |
531 | (unsigned long long) size, dptr->kd_func, dptr->kd_line); | |
532 | ||
d04c8a56 | 533 | kmem_alloc_used_sub(size); |
b17edc10 | 534 | SDEBUG_LIMIT(SD_INFO, "kmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 535 | (unsigned long long) size, kmem_alloc_used_read(), |
a0f6da3d BB |
536 | kmem_alloc_max); |
537 | ||
c8e60837 BB |
538 | kfree(dptr->kd_func); |
539 | ||
a0f6da3d BB |
540 | memset(dptr, 0x5a, sizeof(kmem_debug_t)); |
541 | kfree(dptr); | |
542 | ||
543 | memset(ptr, 0x5a, size); | |
544 | kfree(ptr); | |
545 | ||
b17edc10 | 546 | SEXIT; |
a0f6da3d BB |
547 | } |
548 | EXPORT_SYMBOL(kmem_free_track); | |
549 | ||
550 | void * | |
551 | vmem_alloc_track(size_t size, int flags, const char *func, int line) | |
552 | { | |
553 | void *ptr = NULL; | |
554 | kmem_debug_t *dptr; | |
555 | unsigned long irq_flags; | |
b17edc10 | 556 | SENTRY; |
a0f6da3d BB |
557 | |
558 | ASSERT(flags & KM_SLEEP); | |
559 | ||
10129680 | 560 | /* Function may be called with KM_NOSLEEP so failure is possible */ |
ef1c7a06 BB |
561 | dptr = (kmem_debug_t *) kmalloc_nofail(sizeof(kmem_debug_t), |
562 | flags & ~__GFP_ZERO); | |
10129680 | 563 | if (unlikely(dptr == NULL)) { |
b17edc10 | 564 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, "debug " |
3cb77549 BB |
565 | "vmem_alloc(%ld, 0x%x) at %s:%d failed (%lld/%llu)\n", |
566 | sizeof(kmem_debug_t), flags, func, line, | |
567 | vmem_alloc_used_read(), vmem_alloc_max); | |
a0f6da3d | 568 | } else { |
10129680 BB |
569 | /* |
570 | * We use __strdup() below because the string pointed to by | |
c8e60837 | 571 | * __FUNCTION__ might not be available by the time we want |
10129680 BB |
572 | * to print it, since the module might have been unloaded. |
573 | * This can never fail because we have already asserted | |
574 | * that flags is KM_SLEEP. | |
575 | */ | |
576 | dptr->kd_func = __strdup(func, flags & ~__GFP_ZERO); | |
c8e60837 BB |
577 | if (unlikely(dptr->kd_func == NULL)) { |
578 | kfree(dptr); | |
b17edc10 | 579 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, |
10129680 | 580 | "debug __strdup() at %s:%d failed (%lld/%llu)\n", |
3cb77549 | 581 | func, line, vmem_alloc_used_read(), vmem_alloc_max); |
c8e60837 BB |
582 | goto out; |
583 | } | |
584 | ||
10129680 BB |
585 | /* Use the correct allocator */ |
586 | if (flags & __GFP_ZERO) { | |
587 | ptr = vzalloc_nofail(size, flags & ~__GFP_ZERO); | |
588 | } else { | |
589 | ptr = vmalloc_nofail(size, flags); | |
590 | } | |
a0f6da3d BB |
591 | |
592 | if (unlikely(ptr == NULL)) { | |
c8e60837 | 593 | kfree(dptr->kd_func); |
a0f6da3d | 594 | kfree(dptr); |
b17edc10 | 595 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, "vmem_alloc" |
3cb77549 BB |
596 | "(%llu, 0x%x) at %s:%d failed (%lld/%llu)\n", |
597 | (unsigned long long) size, flags, func, line, | |
d04c8a56 | 598 | vmem_alloc_used_read(), vmem_alloc_max); |
a0f6da3d BB |
599 | goto out; |
600 | } | |
601 | ||
d04c8a56 BB |
602 | vmem_alloc_used_add(size); |
603 | if (unlikely(vmem_alloc_used_read() > vmem_alloc_max)) | |
604 | vmem_alloc_max = vmem_alloc_used_read(); | |
a0f6da3d BB |
605 | |
606 | INIT_HLIST_NODE(&dptr->kd_hlist); | |
607 | INIT_LIST_HEAD(&dptr->kd_list); | |
608 | ||
609 | dptr->kd_addr = ptr; | |
610 | dptr->kd_size = size; | |
a0f6da3d BB |
611 | dptr->kd_line = line; |
612 | ||
613 | spin_lock_irqsave(&vmem_lock, irq_flags); | |
614 | hlist_add_head_rcu(&dptr->kd_hlist, | |
615 | &vmem_table[hash_ptr(ptr, VMEM_HASH_BITS)]); | |
616 | list_add_tail(&dptr->kd_list, &vmem_list); | |
617 | spin_unlock_irqrestore(&vmem_lock, irq_flags); | |
618 | ||
b17edc10 | 619 | SDEBUG_LIMIT(SD_INFO, |
3cb77549 BB |
620 | "vmem_alloc(%llu, 0x%x) at %s:%d = %p (%lld/%llu)\n", |
621 | (unsigned long long) size, flags, func, line, | |
622 | ptr, vmem_alloc_used_read(), vmem_alloc_max); | |
a0f6da3d BB |
623 | } |
624 | out: | |
b17edc10 | 625 | SRETURN(ptr); |
a0f6da3d BB |
626 | } |
627 | EXPORT_SYMBOL(vmem_alloc_track); | |
628 | ||
629 | void | |
973e8269 | 630 | vmem_free_track(const void *ptr, size_t size) |
a0f6da3d BB |
631 | { |
632 | kmem_debug_t *dptr; | |
b17edc10 | 633 | SENTRY; |
a0f6da3d BB |
634 | |
635 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
636 | (unsigned long long) size); | |
637 | ||
638 | dptr = kmem_del_init(&vmem_lock, vmem_table, VMEM_HASH_BITS, ptr); | |
10129680 BB |
639 | |
640 | /* Must exist in hash due to vmem_alloc() */ | |
641 | ASSERT(dptr); | |
a0f6da3d BB |
642 | |
643 | /* Size must match */ | |
644 | ASSERTF(dptr->kd_size == size, "kd_size (%llu) != size (%llu), " | |
645 | "kd_func = %s, kd_line = %d\n", (unsigned long long) dptr->kd_size, | |
646 | (unsigned long long) size, dptr->kd_func, dptr->kd_line); | |
647 | ||
d04c8a56 | 648 | vmem_alloc_used_sub(size); |
b17edc10 | 649 | SDEBUG_LIMIT(SD_INFO, "vmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 650 | (unsigned long long) size, vmem_alloc_used_read(), |
a0f6da3d BB |
651 | vmem_alloc_max); |
652 | ||
c8e60837 BB |
653 | kfree(dptr->kd_func); |
654 | ||
a0f6da3d BB |
655 | memset(dptr, 0x5a, sizeof(kmem_debug_t)); |
656 | kfree(dptr); | |
657 | ||
658 | memset(ptr, 0x5a, size); | |
659 | vfree(ptr); | |
660 | ||
b17edc10 | 661 | SEXIT; |
a0f6da3d BB |
662 | } |
663 | EXPORT_SYMBOL(vmem_free_track); | |
664 | ||
665 | # else /* DEBUG_KMEM_TRACKING */ | |
666 | ||
667 | void * | |
668 | kmem_alloc_debug(size_t size, int flags, const char *func, int line, | |
669 | int node_alloc, int node) | |
670 | { | |
671 | void *ptr; | |
b17edc10 | 672 | SENTRY; |
a0f6da3d | 673 | |
10129680 BB |
674 | /* |
675 | * Marked unlikely because we should never be doing this, | |
676 | * we tolerate to up 2 pages but a single page is best. | |
677 | */ | |
23d91792 | 678 | if (unlikely((size > PAGE_SIZE * 2) && !(flags & KM_NODEBUG))) { |
b17edc10 | 679 | SDEBUG(SD_CONSOLE | SD_WARNING, |
10129680 | 680 | "large kmem_alloc(%llu, 0x%x) at %s:%d (%lld/%llu)\n", |
3cb77549 | 681 | (unsigned long long) size, flags, func, line, |
d04c8a56 | 682 | kmem_alloc_used_read(), kmem_alloc_max); |
4b2220f0 | 683 | dump_stack(); |
5198ea0e | 684 | } |
a0f6da3d BB |
685 | |
686 | /* Use the correct allocator */ | |
687 | if (node_alloc) { | |
688 | ASSERT(!(flags & __GFP_ZERO)); | |
c89fdee4 | 689 | ptr = kmalloc_node_nofail(size, flags, node); |
a0f6da3d | 690 | } else if (flags & __GFP_ZERO) { |
c89fdee4 | 691 | ptr = kzalloc_nofail(size, flags & (~__GFP_ZERO)); |
a0f6da3d | 692 | } else { |
c89fdee4 | 693 | ptr = kmalloc_nofail(size, flags); |
a0f6da3d BB |
694 | } |
695 | ||
10129680 | 696 | if (unlikely(ptr == NULL)) { |
b17edc10 | 697 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, |
3cb77549 BB |
698 | "kmem_alloc(%llu, 0x%x) at %s:%d failed (%lld/%llu)\n", |
699 | (unsigned long long) size, flags, func, line, | |
d04c8a56 | 700 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d | 701 | } else { |
d04c8a56 BB |
702 | kmem_alloc_used_add(size); |
703 | if (unlikely(kmem_alloc_used_read() > kmem_alloc_max)) | |
704 | kmem_alloc_max = kmem_alloc_used_read(); | |
a0f6da3d | 705 | |
b17edc10 | 706 | SDEBUG_LIMIT(SD_INFO, |
3cb77549 BB |
707 | "kmem_alloc(%llu, 0x%x) at %s:%d = %p (%lld/%llu)\n", |
708 | (unsigned long long) size, flags, func, line, ptr, | |
10129680 | 709 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d | 710 | } |
10129680 | 711 | |
b17edc10 | 712 | SRETURN(ptr); |
a0f6da3d BB |
713 | } |
714 | EXPORT_SYMBOL(kmem_alloc_debug); | |
715 | ||
716 | void | |
973e8269 | 717 | kmem_free_debug(const void *ptr, size_t size) |
a0f6da3d | 718 | { |
b17edc10 | 719 | SENTRY; |
a0f6da3d BB |
720 | |
721 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
722 | (unsigned long long) size); | |
723 | ||
d04c8a56 | 724 | kmem_alloc_used_sub(size); |
b17edc10 | 725 | SDEBUG_LIMIT(SD_INFO, "kmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 726 | (unsigned long long) size, kmem_alloc_used_read(), |
a0f6da3d | 727 | kmem_alloc_max); |
a0f6da3d BB |
728 | kfree(ptr); |
729 | ||
b17edc10 | 730 | SEXIT; |
a0f6da3d BB |
731 | } |
732 | EXPORT_SYMBOL(kmem_free_debug); | |
733 | ||
734 | void * | |
735 | vmem_alloc_debug(size_t size, int flags, const char *func, int line) | |
736 | { | |
737 | void *ptr; | |
b17edc10 | 738 | SENTRY; |
a0f6da3d BB |
739 | |
740 | ASSERT(flags & KM_SLEEP); | |
741 | ||
10129680 BB |
742 | /* Use the correct allocator */ |
743 | if (flags & __GFP_ZERO) { | |
744 | ptr = vzalloc_nofail(size, flags & (~__GFP_ZERO)); | |
745 | } else { | |
746 | ptr = vmalloc_nofail(size, flags); | |
747 | } | |
748 | ||
749 | if (unlikely(ptr == NULL)) { | |
b17edc10 | 750 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, |
3cb77549 BB |
751 | "vmem_alloc(%llu, 0x%x) at %s:%d failed (%lld/%llu)\n", |
752 | (unsigned long long) size, flags, func, line, | |
d04c8a56 | 753 | vmem_alloc_used_read(), vmem_alloc_max); |
a0f6da3d | 754 | } else { |
d04c8a56 BB |
755 | vmem_alloc_used_add(size); |
756 | if (unlikely(vmem_alloc_used_read() > vmem_alloc_max)) | |
757 | vmem_alloc_max = vmem_alloc_used_read(); | |
a0f6da3d | 758 | |
b17edc10 | 759 | SDEBUG_LIMIT(SD_INFO, "vmem_alloc(%llu, 0x%x) = %p " |
a0f6da3d | 760 | "(%lld/%llu)\n", (unsigned long long) size, flags, ptr, |
d04c8a56 | 761 | vmem_alloc_used_read(), vmem_alloc_max); |
a0f6da3d BB |
762 | } |
763 | ||
b17edc10 | 764 | SRETURN(ptr); |
a0f6da3d BB |
765 | } |
766 | EXPORT_SYMBOL(vmem_alloc_debug); | |
767 | ||
768 | void | |
973e8269 | 769 | vmem_free_debug(const void *ptr, size_t size) |
a0f6da3d | 770 | { |
b17edc10 | 771 | SENTRY; |
a0f6da3d BB |
772 | |
773 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
774 | (unsigned long long) size); | |
775 | ||
d04c8a56 | 776 | vmem_alloc_used_sub(size); |
b17edc10 | 777 | SDEBUG_LIMIT(SD_INFO, "vmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 778 | (unsigned long long) size, vmem_alloc_used_read(), |
a0f6da3d | 779 | vmem_alloc_max); |
a0f6da3d BB |
780 | vfree(ptr); |
781 | ||
b17edc10 | 782 | SEXIT; |
a0f6da3d BB |
783 | } |
784 | EXPORT_SYMBOL(vmem_free_debug); | |
785 | ||
786 | # endif /* DEBUG_KMEM_TRACKING */ | |
787 | #endif /* DEBUG_KMEM */ | |
788 | ||
10129680 BB |
789 | /* |
790 | * Slab allocation interfaces | |
791 | * | |
792 | * While the Linux slab implementation was inspired by the Solaris | |
ecc39810 | 793 | * implementation I cannot use it to emulate the Solaris APIs. I |
10129680 BB |
794 | * require two features which are not provided by the Linux slab. |
795 | * | |
796 | * 1) Constructors AND destructors. Recent versions of the Linux | |
797 | * kernel have removed support for destructors. This is a deal | |
798 | * breaker for the SPL which contains particularly expensive | |
799 | * initializers for mutex's, condition variables, etc. We also | |
800 | * require a minimal level of cleanup for these data types unlike | |
801 | * many Linux data type which do need to be explicitly destroyed. | |
802 | * | |
803 | * 2) Virtual address space backed slab. Callers of the Solaris slab | |
804 | * expect it to work well for both small are very large allocations. | |
805 | * Because of memory fragmentation the Linux slab which is backed | |
806 | * by kmalloc'ed memory performs very badly when confronted with | |
807 | * large numbers of large allocations. Basing the slab on the | |
ecc39810 | 808 | * virtual address space removes the need for contiguous pages |
10129680 BB |
809 | * and greatly improve performance for large allocations. |
810 | * | |
811 | * For these reasons, the SPL has its own slab implementation with | |
812 | * the needed features. It is not as highly optimized as either the | |
813 | * Solaris or Linux slabs, but it should get me most of what is | |
814 | * needed until it can be optimized or obsoleted by another approach. | |
815 | * | |
816 | * One serious concern I do have about this method is the relatively | |
817 | * small virtual address space on 32bit arches. This will seriously | |
818 | * constrain the size of the slab caches and their performance. | |
819 | * | |
820 | * XXX: Improve the partial slab list by carefully maintaining a | |
821 | * strict ordering of fullest to emptiest slabs based on | |
ecc39810 | 822 | * the slab reference count. This guarantees the when freeing |
10129680 BB |
823 | * slabs back to the system we need only linearly traverse the |
824 | * last N slabs in the list to discover all the freeable slabs. | |
825 | * | |
826 | * XXX: NUMA awareness for optionally allocating memory close to a | |
ecc39810 | 827 | * particular core. This can be advantageous if you know the slab |
10129680 BB |
828 | * object will be short lived and primarily accessed from one core. |
829 | * | |
830 | * XXX: Slab coloring may also yield performance improvements and would | |
831 | * be desirable to implement. | |
832 | */ | |
833 | ||
834 | struct list_head spl_kmem_cache_list; /* List of caches */ | |
835 | struct rw_semaphore spl_kmem_cache_sem; /* Cache list lock */ | |
a10287e0 | 836 | taskq_t *spl_kmem_cache_taskq; /* Task queue for ageing / reclaim */ |
10129680 | 837 | |
d4899f47 | 838 | static void spl_cache_shrink(spl_kmem_cache_t *skc, void *obj); |
10129680 | 839 | |
a55bcaad | 840 | SPL_SHRINKER_CALLBACK_FWD_DECLARE(spl_kmem_cache_generic_shrinker); |
495bd532 BB |
841 | SPL_SHRINKER_DECLARE(spl_kmem_cache_shrinker, |
842 | spl_kmem_cache_generic_shrinker, KMC_DEFAULT_SEEKS); | |
10129680 | 843 | |
a1502d76 BB |
844 | static void * |
845 | kv_alloc(spl_kmem_cache_t *skc, int size, int flags) | |
fece7c99 | 846 | { |
a1502d76 | 847 | void *ptr; |
f1ca4da6 | 848 | |
8b45dda2 BB |
849 | ASSERT(ISP2(size)); |
850 | ||
500e95c8 | 851 | if (skc->skc_flags & KMC_KMEM) |
8b45dda2 | 852 | ptr = (void *)__get_free_pages(flags, get_order(size)); |
500e95c8 | 853 | else |
617f79de BB |
854 | ptr = __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL); |
855 | ||
8b45dda2 BB |
856 | /* Resulting allocated memory will be page aligned */ |
857 | ASSERT(IS_P2ALIGNED(ptr, PAGE_SIZE)); | |
fece7c99 | 858 | |
a1502d76 BB |
859 | return ptr; |
860 | } | |
fece7c99 | 861 | |
a1502d76 BB |
862 | static void |
863 | kv_free(spl_kmem_cache_t *skc, void *ptr, int size) | |
864 | { | |
8b45dda2 BB |
865 | ASSERT(IS_P2ALIGNED(ptr, PAGE_SIZE)); |
866 | ASSERT(ISP2(size)); | |
867 | ||
06089b9e BB |
868 | /* |
869 | * The Linux direct reclaim path uses this out of band value to | |
870 | * determine if forward progress is being made. Normally this is | |
871 | * incremented by kmem_freepages() which is part of the various | |
872 | * Linux slab implementations. However, since we are using none | |
873 | * of that infrastructure we are responsible for incrementing it. | |
874 | */ | |
875 | if (current->reclaim_state) | |
876 | current->reclaim_state->reclaimed_slab += size >> PAGE_SHIFT; | |
877 | ||
8b45dda2 BB |
878 | if (skc->skc_flags & KMC_KMEM) |
879 | free_pages((unsigned long)ptr, get_order(size)); | |
880 | else | |
881 | vfree(ptr); | |
882 | } | |
883 | ||
884 | /* | |
885 | * Required space for each aligned sks. | |
886 | */ | |
887 | static inline uint32_t | |
888 | spl_sks_size(spl_kmem_cache_t *skc) | |
889 | { | |
890 | return P2ROUNDUP_TYPED(sizeof(spl_kmem_slab_t), | |
891 | skc->skc_obj_align, uint32_t); | |
892 | } | |
893 | ||
894 | /* | |
895 | * Required space for each aligned object. | |
896 | */ | |
897 | static inline uint32_t | |
898 | spl_obj_size(spl_kmem_cache_t *skc) | |
899 | { | |
900 | uint32_t align = skc->skc_obj_align; | |
901 | ||
902 | return P2ROUNDUP_TYPED(skc->skc_obj_size, align, uint32_t) + | |
903 | P2ROUNDUP_TYPED(sizeof(spl_kmem_obj_t), align, uint32_t); | |
904 | } | |
905 | ||
906 | /* | |
907 | * Lookup the spl_kmem_object_t for an object given that object. | |
908 | */ | |
909 | static inline spl_kmem_obj_t * | |
910 | spl_sko_from_obj(spl_kmem_cache_t *skc, void *obj) | |
911 | { | |
912 | return obj + P2ROUNDUP_TYPED(skc->skc_obj_size, | |
913 | skc->skc_obj_align, uint32_t); | |
914 | } | |
915 | ||
916 | /* | |
917 | * Required space for each offslab object taking in to account alignment | |
918 | * restrictions and the power-of-two requirement of kv_alloc(). | |
919 | */ | |
920 | static inline uint32_t | |
921 | spl_offslab_size(spl_kmem_cache_t *skc) | |
922 | { | |
923 | return 1UL << (highbit(spl_obj_size(skc)) + 1); | |
fece7c99 BB |
924 | } |
925 | ||
ea3e6ca9 BB |
926 | /* |
927 | * It's important that we pack the spl_kmem_obj_t structure and the | |
48e0606a BB |
928 | * actual objects in to one large address space to minimize the number |
929 | * of calls to the allocator. It is far better to do a few large | |
930 | * allocations and then subdivide it ourselves. Now which allocator | |
931 | * we use requires balancing a few trade offs. | |
932 | * | |
933 | * For small objects we use kmem_alloc() because as long as you are | |
934 | * only requesting a small number of pages (ideally just one) its cheap. | |
935 | * However, when you start requesting multiple pages with kmem_alloc() | |
ecc39810 | 936 | * it gets increasingly expensive since it requires contiguous pages. |
48e0606a | 937 | * For this reason we shift to vmem_alloc() for slabs of large objects |
ecc39810 | 938 | * which removes the need for contiguous pages. We do not use |
48e0606a BB |
939 | * vmem_alloc() in all cases because there is significant locking |
940 | * overhead in __get_vm_area_node(). This function takes a single | |
ecc39810 | 941 | * global lock when acquiring an available virtual address range which |
48e0606a BB |
942 | * serializes all vmem_alloc()'s for all slab caches. Using slightly |
943 | * different allocation functions for small and large objects should | |
944 | * give us the best of both worlds. | |
945 | * | |
946 | * KMC_ONSLAB KMC_OFFSLAB | |
947 | * | |
948 | * +------------------------+ +-----------------+ | |
949 | * | spl_kmem_slab_t --+-+ | | spl_kmem_slab_t |---+-+ | |
950 | * | skc_obj_size <-+ | | +-----------------+ | | | |
951 | * | spl_kmem_obj_t | | | | | |
952 | * | skc_obj_size <---+ | +-----------------+ | | | |
953 | * | spl_kmem_obj_t | | | skc_obj_size | <-+ | | |
954 | * | ... v | | spl_kmem_obj_t | | | |
955 | * +------------------------+ +-----------------+ v | |
956 | */ | |
fece7c99 | 957 | static spl_kmem_slab_t * |
a1502d76 | 958 | spl_slab_alloc(spl_kmem_cache_t *skc, int flags) |
fece7c99 BB |
959 | { |
960 | spl_kmem_slab_t *sks; | |
a1502d76 BB |
961 | spl_kmem_obj_t *sko, *n; |
962 | void *base, *obj; | |
8b45dda2 BB |
963 | uint32_t obj_size, offslab_size = 0; |
964 | int i, rc = 0; | |
48e0606a | 965 | |
a1502d76 BB |
966 | base = kv_alloc(skc, skc->skc_slab_size, flags); |
967 | if (base == NULL) | |
b17edc10 | 968 | SRETURN(NULL); |
fece7c99 | 969 | |
a1502d76 BB |
970 | sks = (spl_kmem_slab_t *)base; |
971 | sks->sks_magic = SKS_MAGIC; | |
972 | sks->sks_objs = skc->skc_slab_objs; | |
973 | sks->sks_age = jiffies; | |
974 | sks->sks_cache = skc; | |
975 | INIT_LIST_HEAD(&sks->sks_list); | |
976 | INIT_LIST_HEAD(&sks->sks_free_list); | |
977 | sks->sks_ref = 0; | |
8b45dda2 | 978 | obj_size = spl_obj_size(skc); |
48e0606a | 979 | |
8d177c18 | 980 | if (skc->skc_flags & KMC_OFFSLAB) |
8b45dda2 | 981 | offslab_size = spl_offslab_size(skc); |
fece7c99 BB |
982 | |
983 | for (i = 0; i < sks->sks_objs; i++) { | |
a1502d76 | 984 | if (skc->skc_flags & KMC_OFFSLAB) { |
8b45dda2 | 985 | obj = kv_alloc(skc, offslab_size, flags); |
a1502d76 | 986 | if (!obj) |
b17edc10 | 987 | SGOTO(out, rc = -ENOMEM); |
a1502d76 | 988 | } else { |
8b45dda2 | 989 | obj = base + spl_sks_size(skc) + (i * obj_size); |
a1502d76 BB |
990 | } |
991 | ||
8b45dda2 BB |
992 | ASSERT(IS_P2ALIGNED(obj, skc->skc_obj_align)); |
993 | sko = spl_sko_from_obj(skc, obj); | |
fece7c99 BB |
994 | sko->sko_addr = obj; |
995 | sko->sko_magic = SKO_MAGIC; | |
996 | sko->sko_slab = sks; | |
997 | INIT_LIST_HEAD(&sko->sko_list); | |
fece7c99 BB |
998 | list_add_tail(&sko->sko_list, &sks->sks_free_list); |
999 | } | |
1000 | ||
fece7c99 BB |
1001 | list_for_each_entry(sko, &sks->sks_free_list, sko_list) |
1002 | if (skc->skc_ctor) | |
1003 | skc->skc_ctor(sko->sko_addr, skc->skc_private, flags); | |
2fb9b26a | 1004 | out: |
a1502d76 BB |
1005 | if (rc) { |
1006 | if (skc->skc_flags & KMC_OFFSLAB) | |
48e0606a BB |
1007 | list_for_each_entry_safe(sko, n, &sks->sks_free_list, |
1008 | sko_list) | |
8b45dda2 | 1009 | kv_free(skc, sko->sko_addr, offslab_size); |
fece7c99 | 1010 | |
a1502d76 BB |
1011 | kv_free(skc, base, skc->skc_slab_size); |
1012 | sks = NULL; | |
fece7c99 BB |
1013 | } |
1014 | ||
b17edc10 | 1015 | SRETURN(sks); |
fece7c99 BB |
1016 | } |
1017 | ||
ea3e6ca9 BB |
1018 | /* |
1019 | * Remove a slab from complete or partial list, it must be called with | |
1020 | * the 'skc->skc_lock' held but the actual free must be performed | |
1021 | * outside the lock to prevent deadlocking on vmem addresses. | |
fece7c99 | 1022 | */ |
f1ca4da6 | 1023 | static void |
ea3e6ca9 BB |
1024 | spl_slab_free(spl_kmem_slab_t *sks, |
1025 | struct list_head *sks_list, struct list_head *sko_list) | |
1026 | { | |
2fb9b26a | 1027 | spl_kmem_cache_t *skc; |
b17edc10 | 1028 | SENTRY; |
57d86234 | 1029 | |
2fb9b26a | 1030 | ASSERT(sks->sks_magic == SKS_MAGIC); |
4afaaefa | 1031 | ASSERT(sks->sks_ref == 0); |
d6a26c6a | 1032 | |
fece7c99 BB |
1033 | skc = sks->sks_cache; |
1034 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
d46630e0 | 1035 | ASSERT(spin_is_locked(&skc->skc_lock)); |
f1ca4da6 | 1036 | |
1a944a7d BB |
1037 | /* |
1038 | * Update slab/objects counters in the cache, then remove the | |
1039 | * slab from the skc->skc_partial_list. Finally add the slab | |
1040 | * and all its objects in to the private work lists where the | |
1041 | * destructors will be called and the memory freed to the system. | |
1042 | */ | |
fece7c99 BB |
1043 | skc->skc_obj_total -= sks->sks_objs; |
1044 | skc->skc_slab_total--; | |
1045 | list_del(&sks->sks_list); | |
ea3e6ca9 | 1046 | list_add(&sks->sks_list, sks_list); |
1a944a7d BB |
1047 | list_splice_init(&sks->sks_free_list, sko_list); |
1048 | ||
b17edc10 | 1049 | SEXIT; |
2fb9b26a | 1050 | } |
d6a26c6a | 1051 | |
ea3e6ca9 BB |
1052 | /* |
1053 | * Traverses all the partial slabs attached to a cache and free those | |
1054 | * which which are currently empty, and have not been touched for | |
37db7d8c BB |
1055 | * skc_delay seconds to avoid thrashing. The count argument is |
1056 | * passed to optionally cap the number of slabs reclaimed, a count | |
1057 | * of zero means try and reclaim everything. When flag is set we | |
1058 | * always free an available slab regardless of age. | |
ea3e6ca9 BB |
1059 | */ |
1060 | static void | |
37db7d8c | 1061 | spl_slab_reclaim(spl_kmem_cache_t *skc, int count, int flag) |
2fb9b26a BB |
1062 | { |
1063 | spl_kmem_slab_t *sks, *m; | |
ea3e6ca9 BB |
1064 | spl_kmem_obj_t *sko, *n; |
1065 | LIST_HEAD(sks_list); | |
1066 | LIST_HEAD(sko_list); | |
8b45dda2 BB |
1067 | uint32_t size = 0; |
1068 | int i = 0; | |
b17edc10 | 1069 | SENTRY; |
2fb9b26a | 1070 | |
2fb9b26a | 1071 | /* |
ea3e6ca9 BB |
1072 | * Move empty slabs and objects which have not been touched in |
1073 | * skc_delay seconds on to private lists to be freed outside | |
1a944a7d BB |
1074 | * the spin lock. This delay time is important to avoid thrashing |
1075 | * however when flag is set the delay will not be used. | |
2fb9b26a | 1076 | */ |
ea3e6ca9 | 1077 | spin_lock(&skc->skc_lock); |
1a944a7d BB |
1078 | list_for_each_entry_safe_reverse(sks,m,&skc->skc_partial_list,sks_list){ |
1079 | /* | |
1080 | * All empty slabs are at the end of skc->skc_partial_list, | |
1081 | * therefore once a non-empty slab is found we can stop | |
1082 | * scanning. Additionally, stop when reaching the target | |
ecc39810 | 1083 | * reclaim 'count' if a non-zero threshold is given. |
1a944a7d | 1084 | */ |
cef7605c | 1085 | if ((sks->sks_ref > 0) || (count && i >= count)) |
37db7d8c BB |
1086 | break; |
1087 | ||
37db7d8c | 1088 | if (time_after(jiffies,sks->sks_age+skc->skc_delay*HZ)||flag) { |
ea3e6ca9 | 1089 | spl_slab_free(sks, &sks_list, &sko_list); |
37db7d8c BB |
1090 | i++; |
1091 | } | |
ea3e6ca9 BB |
1092 | } |
1093 | spin_unlock(&skc->skc_lock); | |
1094 | ||
1095 | /* | |
1a944a7d BB |
1096 | * The following two loops ensure all the object destructors are |
1097 | * run, any offslab objects are freed, and the slabs themselves | |
1098 | * are freed. This is all done outside the skc->skc_lock since | |
1099 | * this allows the destructor to sleep, and allows us to perform | |
1100 | * a conditional reschedule when a freeing a large number of | |
1101 | * objects and slabs back to the system. | |
ea3e6ca9 | 1102 | */ |
1a944a7d | 1103 | if (skc->skc_flags & KMC_OFFSLAB) |
8b45dda2 | 1104 | size = spl_offslab_size(skc); |
ea3e6ca9 | 1105 | |
1a944a7d BB |
1106 | list_for_each_entry_safe(sko, n, &sko_list, sko_list) { |
1107 | ASSERT(sko->sko_magic == SKO_MAGIC); | |
1108 | ||
1109 | if (skc->skc_dtor) | |
1110 | skc->skc_dtor(sko->sko_addr, skc->skc_private); | |
1111 | ||
1112 | if (skc->skc_flags & KMC_OFFSLAB) | |
ea3e6ca9 | 1113 | kv_free(skc, sko->sko_addr, size); |
1a944a7d BB |
1114 | |
1115 | cond_resched(); | |
2fb9b26a BB |
1116 | } |
1117 | ||
37db7d8c | 1118 | list_for_each_entry_safe(sks, m, &sks_list, sks_list) { |
1a944a7d | 1119 | ASSERT(sks->sks_magic == SKS_MAGIC); |
ea3e6ca9 | 1120 | kv_free(skc, sks, skc->skc_slab_size); |
37db7d8c BB |
1121 | cond_resched(); |
1122 | } | |
ea3e6ca9 | 1123 | |
b17edc10 | 1124 | SEXIT; |
f1ca4da6 BB |
1125 | } |
1126 | ||
ed316348 BB |
1127 | static spl_kmem_emergency_t * |
1128 | spl_emergency_search(struct rb_root *root, void *obj) | |
1129 | { | |
1130 | struct rb_node *node = root->rb_node; | |
1131 | spl_kmem_emergency_t *ske; | |
1132 | unsigned long address = (unsigned long)obj; | |
1133 | ||
1134 | while (node) { | |
1135 | ske = container_of(node, spl_kmem_emergency_t, ske_node); | |
1136 | ||
1137 | if (address < (unsigned long)ske->ske_obj) | |
1138 | node = node->rb_left; | |
1139 | else if (address > (unsigned long)ske->ske_obj) | |
1140 | node = node->rb_right; | |
1141 | else | |
1142 | return ske; | |
1143 | } | |
1144 | ||
1145 | return NULL; | |
1146 | } | |
1147 | ||
1148 | static int | |
1149 | spl_emergency_insert(struct rb_root *root, spl_kmem_emergency_t *ske) | |
1150 | { | |
1151 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
1152 | spl_kmem_emergency_t *ske_tmp; | |
1153 | unsigned long address = (unsigned long)ske->ske_obj; | |
1154 | ||
1155 | while (*new) { | |
1156 | ske_tmp = container_of(*new, spl_kmem_emergency_t, ske_node); | |
1157 | ||
1158 | parent = *new; | |
1159 | if (address < (unsigned long)ske_tmp->ske_obj) | |
1160 | new = &((*new)->rb_left); | |
1161 | else if (address > (unsigned long)ske_tmp->ske_obj) | |
1162 | new = &((*new)->rb_right); | |
1163 | else | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | rb_link_node(&ske->ske_node, parent, new); | |
1168 | rb_insert_color(&ske->ske_node, root); | |
1169 | ||
1170 | return 1; | |
1171 | } | |
1172 | ||
e2dcc6e2 | 1173 | /* |
ed316348 | 1174 | * Allocate a single emergency object and track it in a red black tree. |
e2dcc6e2 BB |
1175 | */ |
1176 | static int | |
1177 | spl_emergency_alloc(spl_kmem_cache_t *skc, int flags, void **obj) | |
1178 | { | |
1179 | spl_kmem_emergency_t *ske; | |
1180 | int empty; | |
1181 | SENTRY; | |
1182 | ||
1183 | /* Last chance use a partial slab if one now exists */ | |
1184 | spin_lock(&skc->skc_lock); | |
1185 | empty = list_empty(&skc->skc_partial_list); | |
1186 | spin_unlock(&skc->skc_lock); | |
1187 | if (!empty) | |
1188 | SRETURN(-EEXIST); | |
1189 | ||
1190 | ske = kmalloc(sizeof(*ske), flags); | |
1191 | if (ske == NULL) | |
1192 | SRETURN(-ENOMEM); | |
1193 | ||
1194 | ske->ske_obj = kmalloc(skc->skc_obj_size, flags); | |
1195 | if (ske->ske_obj == NULL) { | |
1196 | kfree(ske); | |
1197 | SRETURN(-ENOMEM); | |
1198 | } | |
1199 | ||
e2dcc6e2 | 1200 | spin_lock(&skc->skc_lock); |
ed316348 BB |
1201 | empty = spl_emergency_insert(&skc->skc_emergency_tree, ske); |
1202 | if (likely(empty)) { | |
1203 | skc->skc_obj_total++; | |
1204 | skc->skc_obj_emergency++; | |
1205 | if (skc->skc_obj_emergency > skc->skc_obj_emergency_max) | |
1206 | skc->skc_obj_emergency_max = skc->skc_obj_emergency; | |
1207 | } | |
e2dcc6e2 BB |
1208 | spin_unlock(&skc->skc_lock); |
1209 | ||
ed316348 BB |
1210 | if (unlikely(!empty)) { |
1211 | kfree(ske->ske_obj); | |
1212 | kfree(ske); | |
1213 | SRETURN(-EINVAL); | |
1214 | } | |
1215 | ||
1216 | if (skc->skc_ctor) | |
1217 | skc->skc_ctor(ske->ske_obj, skc->skc_private, flags); | |
1218 | ||
e2dcc6e2 BB |
1219 | *obj = ske->ske_obj; |
1220 | ||
1221 | SRETURN(0); | |
1222 | } | |
1223 | ||
1224 | /* | |
ed316348 | 1225 | * Locate the passed object in the red black tree and free it. |
e2dcc6e2 BB |
1226 | */ |
1227 | static int | |
1228 | spl_emergency_free(spl_kmem_cache_t *skc, void *obj) | |
1229 | { | |
ed316348 | 1230 | spl_kmem_emergency_t *ske; |
e2dcc6e2 BB |
1231 | SENTRY; |
1232 | ||
1233 | spin_lock(&skc->skc_lock); | |
ed316348 BB |
1234 | ske = spl_emergency_search(&skc->skc_emergency_tree, obj); |
1235 | if (likely(ske)) { | |
1236 | rb_erase(&ske->ske_node, &skc->skc_emergency_tree); | |
1237 | skc->skc_obj_emergency--; | |
1238 | skc->skc_obj_total--; | |
e2dcc6e2 BB |
1239 | } |
1240 | spin_unlock(&skc->skc_lock); | |
1241 | ||
ed316348 | 1242 | if (unlikely(ske == NULL)) |
e2dcc6e2 BB |
1243 | SRETURN(-ENOENT); |
1244 | ||
1245 | if (skc->skc_dtor) | |
1246 | skc->skc_dtor(ske->ske_obj, skc->skc_private); | |
1247 | ||
1248 | kfree(ske->ske_obj); | |
1249 | kfree(ske); | |
1250 | ||
1251 | SRETURN(0); | |
1252 | } | |
1253 | ||
d4899f47 BB |
1254 | /* |
1255 | * Release objects from the per-cpu magazine back to their slab. The flush | |
1256 | * argument contains the max number of entries to remove from the magazine. | |
1257 | */ | |
1258 | static void | |
1259 | __spl_cache_flush(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flush) | |
1260 | { | |
1261 | int i, count = MIN(flush, skm->skm_avail); | |
1262 | SENTRY; | |
1263 | ||
1264 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
1265 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
1266 | ASSERT(spin_is_locked(&skc->skc_lock)); | |
1267 | ||
1268 | for (i = 0; i < count; i++) | |
1269 | spl_cache_shrink(skc, skm->skm_objs[i]); | |
1270 | ||
1271 | skm->skm_avail -= count; | |
1272 | memmove(skm->skm_objs, &(skm->skm_objs[count]), | |
1273 | sizeof(void *) * skm->skm_avail); | |
1274 | ||
1275 | SEXIT; | |
1276 | } | |
1277 | ||
1278 | static void | |
1279 | spl_cache_flush(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flush) | |
1280 | { | |
1281 | spin_lock(&skc->skc_lock); | |
1282 | __spl_cache_flush(skc, skm, flush); | |
1283 | spin_unlock(&skc->skc_lock); | |
1284 | } | |
1285 | ||
ea3e6ca9 BB |
1286 | static void |
1287 | spl_magazine_age(void *data) | |
f1ca4da6 | 1288 | { |
a10287e0 BB |
1289 | spl_kmem_cache_t *skc = (spl_kmem_cache_t *)data; |
1290 | spl_kmem_magazine_t *skm = skc->skc_mag[smp_processor_id()]; | |
9b1b8e4c BB |
1291 | |
1292 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
a10287e0 | 1293 | ASSERT(skm->skm_cpu == smp_processor_id()); |
d4899f47 BB |
1294 | ASSERT(irqs_disabled()); |
1295 | ||
1296 | /* There are no available objects or they are too young to age out */ | |
1297 | if ((skm->skm_avail == 0) || | |
1298 | time_before(jiffies, skm->skm_age + skc->skc_delay * HZ)) | |
1299 | return; | |
f1ca4da6 | 1300 | |
d4899f47 BB |
1301 | /* |
1302 | * Because we're executing in interrupt context we may have | |
1303 | * interrupted the holder of this lock. To avoid a potential | |
1304 | * deadlock return if the lock is contended. | |
1305 | */ | |
1306 | if (!spin_trylock(&skc->skc_lock)) | |
1307 | return; | |
1308 | ||
1309 | __spl_cache_flush(skc, skm, skm->skm_refill); | |
1310 | spin_unlock(&skc->skc_lock); | |
ea3e6ca9 | 1311 | } |
4efd4118 | 1312 | |
ea3e6ca9 | 1313 | /* |
a10287e0 BB |
1314 | * Called regularly to keep a downward pressure on the cache. |
1315 | * | |
1316 | * Objects older than skc->skc_delay seconds in the per-cpu magazines will | |
1317 | * be returned to the caches. This is done to prevent idle magazines from | |
1318 | * holding memory which could be better used elsewhere. The delay is | |
1319 | * present to prevent thrashing the magazine. | |
1320 | * | |
1321 | * The newly released objects may result in empty partial slabs. Those | |
1322 | * slabs should be released to the system. Otherwise moving the objects | |
1323 | * out of the magazines is just wasted work. | |
ea3e6ca9 BB |
1324 | */ |
1325 | static void | |
1326 | spl_cache_age(void *data) | |
1327 | { | |
a10287e0 BB |
1328 | spl_kmem_cache_t *skc = (spl_kmem_cache_t *)data; |
1329 | taskqid_t id = 0; | |
ea3e6ca9 BB |
1330 | |
1331 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
a10287e0 | 1332 | |
0936c344 BB |
1333 | /* Dynamically disabled at run time */ |
1334 | if (!(spl_kmem_cache_expire & KMC_EXPIRE_AGE)) | |
1335 | return; | |
1336 | ||
a10287e0 BB |
1337 | atomic_inc(&skc->skc_ref); |
1338 | spl_on_each_cpu(spl_magazine_age, skc, 1); | |
37db7d8c | 1339 | spl_slab_reclaim(skc, skc->skc_reap, 0); |
ea3e6ca9 | 1340 | |
a10287e0 BB |
1341 | while (!test_bit(KMC_BIT_DESTROY, &skc->skc_flags) && !id) { |
1342 | id = taskq_dispatch_delay( | |
1343 | spl_kmem_cache_taskq, spl_cache_age, skc, TQ_SLEEP, | |
1344 | ddi_get_lbolt() + skc->skc_delay / 3 * HZ); | |
1345 | ||
1346 | /* Destroy issued after dispatch immediately cancel it */ | |
1347 | if (test_bit(KMC_BIT_DESTROY, &skc->skc_flags) && id) | |
1348 | taskq_cancel_id(spl_kmem_cache_taskq, id); | |
1349 | } | |
1350 | ||
1351 | spin_lock(&skc->skc_lock); | |
1352 | skc->skc_taskqid = id; | |
1353 | spin_unlock(&skc->skc_lock); | |
1354 | ||
1355 | atomic_dec(&skc->skc_ref); | |
2fb9b26a | 1356 | } |
f1ca4da6 | 1357 | |
ea3e6ca9 | 1358 | /* |
8b45dda2 | 1359 | * Size a slab based on the size of each aligned object plus spl_kmem_obj_t. |
ea3e6ca9 BB |
1360 | * When on-slab we want to target SPL_KMEM_CACHE_OBJ_PER_SLAB. However, |
1361 | * for very small objects we may end up with more than this so as not | |
1362 | * to waste space in the minimal allocation of a single page. Also for | |
1363 | * very large objects we may use as few as SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN, | |
1364 | * lower than this and we will fail. | |
1365 | */ | |
48e0606a BB |
1366 | static int |
1367 | spl_slab_size(spl_kmem_cache_t *skc, uint32_t *objs, uint32_t *size) | |
1368 | { | |
8b45dda2 | 1369 | uint32_t sks_size, obj_size, max_size; |
48e0606a BB |
1370 | |
1371 | if (skc->skc_flags & KMC_OFFSLAB) { | |
ea3e6ca9 | 1372 | *objs = SPL_KMEM_CACHE_OBJ_PER_SLAB; |
48e0606a BB |
1373 | *size = sizeof(spl_kmem_slab_t); |
1374 | } else { | |
8b45dda2 BB |
1375 | sks_size = spl_sks_size(skc); |
1376 | obj_size = spl_obj_size(skc); | |
ea3e6ca9 BB |
1377 | |
1378 | if (skc->skc_flags & KMC_KMEM) | |
aa600d8a | 1379 | max_size = ((uint32_t)1 << (MAX_ORDER-3)) * PAGE_SIZE; |
ea3e6ca9 BB |
1380 | else |
1381 | max_size = (32 * 1024 * 1024); | |
48e0606a | 1382 | |
8b45dda2 BB |
1383 | /* Power of two sized slab */ |
1384 | for (*size = PAGE_SIZE; *size <= max_size; *size *= 2) { | |
ea3e6ca9 BB |
1385 | *objs = (*size - sks_size) / obj_size; |
1386 | if (*objs >= SPL_KMEM_CACHE_OBJ_PER_SLAB) | |
b17edc10 | 1387 | SRETURN(0); |
ea3e6ca9 | 1388 | } |
48e0606a | 1389 | |
ea3e6ca9 | 1390 | /* |
8b45dda2 | 1391 | * Unable to satisfy target objects per slab, fall back to |
ea3e6ca9 BB |
1392 | * allocating a maximally sized slab and assuming it can |
1393 | * contain the minimum objects count use it. If not fail. | |
1394 | */ | |
1395 | *size = max_size; | |
1396 | *objs = (*size - sks_size) / obj_size; | |
1397 | if (*objs >= SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN) | |
b17edc10 | 1398 | SRETURN(0); |
48e0606a BB |
1399 | } |
1400 | ||
b17edc10 | 1401 | SRETURN(-ENOSPC); |
48e0606a BB |
1402 | } |
1403 | ||
ea3e6ca9 BB |
1404 | /* |
1405 | * Make a guess at reasonable per-cpu magazine size based on the size of | |
1406 | * each object and the cost of caching N of them in each magazine. Long | |
1407 | * term this should really adapt based on an observed usage heuristic. | |
1408 | */ | |
4afaaefa BB |
1409 | static int |
1410 | spl_magazine_size(spl_kmem_cache_t *skc) | |
1411 | { | |
8b45dda2 BB |
1412 | uint32_t obj_size = spl_obj_size(skc); |
1413 | int size; | |
b17edc10 | 1414 | SENTRY; |
4afaaefa | 1415 | |
ea3e6ca9 | 1416 | /* Per-magazine sizes below assume a 4Kib page size */ |
8b45dda2 | 1417 | if (obj_size > (PAGE_SIZE * 256)) |
ea3e6ca9 | 1418 | size = 4; /* Minimum 4Mib per-magazine */ |
8b45dda2 | 1419 | else if (obj_size > (PAGE_SIZE * 32)) |
ea3e6ca9 | 1420 | size = 16; /* Minimum 2Mib per-magazine */ |
8b45dda2 | 1421 | else if (obj_size > (PAGE_SIZE)) |
ea3e6ca9 | 1422 | size = 64; /* Minimum 256Kib per-magazine */ |
8b45dda2 | 1423 | else if (obj_size > (PAGE_SIZE / 4)) |
ea3e6ca9 | 1424 | size = 128; /* Minimum 128Kib per-magazine */ |
4afaaefa | 1425 | else |
ea3e6ca9 | 1426 | size = 256; |
4afaaefa | 1427 | |
b17edc10 | 1428 | SRETURN(size); |
4afaaefa BB |
1429 | } |
1430 | ||
ea3e6ca9 | 1431 | /* |
ecc39810 | 1432 | * Allocate a per-cpu magazine to associate with a specific core. |
ea3e6ca9 | 1433 | */ |
4afaaefa | 1434 | static spl_kmem_magazine_t * |
08850edd | 1435 | spl_magazine_alloc(spl_kmem_cache_t *skc, int cpu) |
4afaaefa BB |
1436 | { |
1437 | spl_kmem_magazine_t *skm; | |
1438 | int size = sizeof(spl_kmem_magazine_t) + | |
1439 | sizeof(void *) * skc->skc_mag_size; | |
b17edc10 | 1440 | SENTRY; |
4afaaefa | 1441 | |
08850edd | 1442 | skm = kmem_alloc_node(size, KM_SLEEP, cpu_to_node(cpu)); |
4afaaefa BB |
1443 | if (skm) { |
1444 | skm->skm_magic = SKM_MAGIC; | |
1445 | skm->skm_avail = 0; | |
1446 | skm->skm_size = skc->skc_mag_size; | |
1447 | skm->skm_refill = skc->skc_mag_refill; | |
9b1b8e4c | 1448 | skm->skm_cache = skc; |
ea3e6ca9 | 1449 | skm->skm_age = jiffies; |
08850edd | 1450 | skm->skm_cpu = cpu; |
4afaaefa BB |
1451 | } |
1452 | ||
b17edc10 | 1453 | SRETURN(skm); |
4afaaefa BB |
1454 | } |
1455 | ||
ea3e6ca9 | 1456 | /* |
ecc39810 | 1457 | * Free a per-cpu magazine associated with a specific core. |
ea3e6ca9 | 1458 | */ |
4afaaefa BB |
1459 | static void |
1460 | spl_magazine_free(spl_kmem_magazine_t *skm) | |
1461 | { | |
a0f6da3d BB |
1462 | int size = sizeof(spl_kmem_magazine_t) + |
1463 | sizeof(void *) * skm->skm_size; | |
1464 | ||
b17edc10 | 1465 | SENTRY; |
4afaaefa BB |
1466 | ASSERT(skm->skm_magic == SKM_MAGIC); |
1467 | ASSERT(skm->skm_avail == 0); | |
a0f6da3d BB |
1468 | |
1469 | kmem_free(skm, size); | |
b17edc10 | 1470 | SEXIT; |
4afaaefa BB |
1471 | } |
1472 | ||
ea3e6ca9 BB |
1473 | /* |
1474 | * Create all pre-cpu magazines of reasonable sizes. | |
1475 | */ | |
4afaaefa BB |
1476 | static int |
1477 | spl_magazine_create(spl_kmem_cache_t *skc) | |
1478 | { | |
37db7d8c | 1479 | int i; |
b17edc10 | 1480 | SENTRY; |
4afaaefa BB |
1481 | |
1482 | skc->skc_mag_size = spl_magazine_size(skc); | |
ea3e6ca9 | 1483 | skc->skc_mag_refill = (skc->skc_mag_size + 1) / 2; |
4afaaefa | 1484 | |
37db7d8c | 1485 | for_each_online_cpu(i) { |
08850edd | 1486 | skc->skc_mag[i] = spl_magazine_alloc(skc, i); |
37db7d8c BB |
1487 | if (!skc->skc_mag[i]) { |
1488 | for (i--; i >= 0; i--) | |
1489 | spl_magazine_free(skc->skc_mag[i]); | |
4afaaefa | 1490 | |
b17edc10 | 1491 | SRETURN(-ENOMEM); |
37db7d8c BB |
1492 | } |
1493 | } | |
4afaaefa | 1494 | |
b17edc10 | 1495 | SRETURN(0); |
4afaaefa BB |
1496 | } |
1497 | ||
ea3e6ca9 BB |
1498 | /* |
1499 | * Destroy all pre-cpu magazines. | |
1500 | */ | |
4afaaefa BB |
1501 | static void |
1502 | spl_magazine_destroy(spl_kmem_cache_t *skc) | |
1503 | { | |
37db7d8c BB |
1504 | spl_kmem_magazine_t *skm; |
1505 | int i; | |
b17edc10 | 1506 | SENTRY; |
37db7d8c BB |
1507 | |
1508 | for_each_online_cpu(i) { | |
1509 | skm = skc->skc_mag[i]; | |
d4899f47 | 1510 | spl_cache_flush(skc, skm, skm->skm_avail); |
37db7d8c BB |
1511 | spl_magazine_free(skm); |
1512 | } | |
1513 | ||
b17edc10 | 1514 | SEXIT; |
4afaaefa BB |
1515 | } |
1516 | ||
ea3e6ca9 BB |
1517 | /* |
1518 | * Create a object cache based on the following arguments: | |
1519 | * name cache name | |
1520 | * size cache object size | |
1521 | * align cache object alignment | |
1522 | * ctor cache object constructor | |
1523 | * dtor cache object destructor | |
1524 | * reclaim cache object reclaim | |
1525 | * priv cache private data for ctor/dtor/reclaim | |
1526 | * vmp unused must be NULL | |
1527 | * flags | |
1528 | * KMC_NOTOUCH Disable cache object aging (unsupported) | |
1529 | * KMC_NODEBUG Disable debugging (unsupported) | |
1530 | * KMC_NOMAGAZINE Disable magazine (unsupported) | |
1531 | * KMC_NOHASH Disable hashing (unsupported) | |
1532 | * KMC_QCACHE Disable qcache (unsupported) | |
1533 | * KMC_KMEM Force kmem backed cache | |
1534 | * KMC_VMEM Force vmem backed cache | |
1535 | * KMC_OFFSLAB Locate objects off the slab | |
1536 | */ | |
2fb9b26a BB |
1537 | spl_kmem_cache_t * |
1538 | spl_kmem_cache_create(char *name, size_t size, size_t align, | |
1539 | spl_kmem_ctor_t ctor, | |
1540 | spl_kmem_dtor_t dtor, | |
1541 | spl_kmem_reclaim_t reclaim, | |
1542 | void *priv, void *vmp, int flags) | |
1543 | { | |
1544 | spl_kmem_cache_t *skc; | |
296a8e59 | 1545 | int rc; |
b17edc10 | 1546 | SENTRY; |
937879f1 | 1547 | |
a1502d76 BB |
1548 | ASSERTF(!(flags & KMC_NOMAGAZINE), "Bad KMC_NOMAGAZINE (%x)\n", flags); |
1549 | ASSERTF(!(flags & KMC_NOHASH), "Bad KMC_NOHASH (%x)\n", flags); | |
1550 | ASSERTF(!(flags & KMC_QCACHE), "Bad KMC_QCACHE (%x)\n", flags); | |
48e0606a | 1551 | ASSERT(vmp == NULL); |
a1502d76 | 1552 | |
296a8e59 | 1553 | might_sleep(); |
0a6fd143 | 1554 | |
296a8e59 BB |
1555 | /* |
1556 | * Allocate memory for a new cache an initialize it. Unfortunately, | |
5198ea0e BB |
1557 | * this usually ends up being a large allocation of ~32k because |
1558 | * we need to allocate enough memory for the worst case number of | |
1559 | * cpus in the magazine, skc_mag[NR_CPUS]. Because of this we | |
296a8e59 BB |
1560 | * explicitly pass KM_NODEBUG to suppress the kmem warning |
1561 | */ | |
1562 | skc = kmem_zalloc(sizeof(*skc), KM_SLEEP| KM_NODEBUG); | |
e9d7a2be | 1563 | if (skc == NULL) |
b17edc10 | 1564 | SRETURN(NULL); |
d61e12af | 1565 | |
2fb9b26a | 1566 | skc->skc_magic = SKC_MAGIC; |
2fb9b26a | 1567 | skc->skc_name_size = strlen(name) + 1; |
296a8e59 | 1568 | skc->skc_name = (char *)kmem_alloc(skc->skc_name_size, KM_SLEEP); |
2fb9b26a BB |
1569 | if (skc->skc_name == NULL) { |
1570 | kmem_free(skc, sizeof(*skc)); | |
b17edc10 | 1571 | SRETURN(NULL); |
2fb9b26a BB |
1572 | } |
1573 | strncpy(skc->skc_name, name, skc->skc_name_size); | |
1574 | ||
e9d7a2be BB |
1575 | skc->skc_ctor = ctor; |
1576 | skc->skc_dtor = dtor; | |
1577 | skc->skc_reclaim = reclaim; | |
2fb9b26a BB |
1578 | skc->skc_private = priv; |
1579 | skc->skc_vmp = vmp; | |
1580 | skc->skc_flags = flags; | |
1581 | skc->skc_obj_size = size; | |
48e0606a | 1582 | skc->skc_obj_align = SPL_KMEM_CACHE_ALIGN; |
2fb9b26a | 1583 | skc->skc_delay = SPL_KMEM_CACHE_DELAY; |
37db7d8c | 1584 | skc->skc_reap = SPL_KMEM_CACHE_REAP; |
ea3e6ca9 | 1585 | atomic_set(&skc->skc_ref, 0); |
2fb9b26a | 1586 | |
2fb9b26a BB |
1587 | INIT_LIST_HEAD(&skc->skc_list); |
1588 | INIT_LIST_HEAD(&skc->skc_complete_list); | |
1589 | INIT_LIST_HEAD(&skc->skc_partial_list); | |
ed316348 | 1590 | skc->skc_emergency_tree = RB_ROOT; |
d46630e0 | 1591 | spin_lock_init(&skc->skc_lock); |
e2dcc6e2 | 1592 | init_waitqueue_head(&skc->skc_waitq); |
e9d7a2be BB |
1593 | skc->skc_slab_fail = 0; |
1594 | skc->skc_slab_create = 0; | |
1595 | skc->skc_slab_destroy = 0; | |
2fb9b26a BB |
1596 | skc->skc_slab_total = 0; |
1597 | skc->skc_slab_alloc = 0; | |
1598 | skc->skc_slab_max = 0; | |
1599 | skc->skc_obj_total = 0; | |
1600 | skc->skc_obj_alloc = 0; | |
1601 | skc->skc_obj_max = 0; | |
165f13c3 | 1602 | skc->skc_obj_deadlock = 0; |
e2dcc6e2 BB |
1603 | skc->skc_obj_emergency = 0; |
1604 | skc->skc_obj_emergency_max = 0; | |
a1502d76 | 1605 | |
48e0606a | 1606 | if (align) { |
8b45dda2 BB |
1607 | VERIFY(ISP2(align)); |
1608 | VERIFY3U(align, >=, SPL_KMEM_CACHE_ALIGN); /* Min alignment */ | |
1609 | VERIFY3U(align, <=, PAGE_SIZE); /* Max alignment */ | |
48e0606a BB |
1610 | skc->skc_obj_align = align; |
1611 | } | |
1612 | ||
a1502d76 BB |
1613 | /* If none passed select a cache type based on object size */ |
1614 | if (!(skc->skc_flags & (KMC_KMEM | KMC_VMEM))) { | |
8b45dda2 | 1615 | if (spl_obj_size(skc) < (PAGE_SIZE / 8)) |
a1502d76 | 1616 | skc->skc_flags |= KMC_KMEM; |
8b45dda2 | 1617 | else |
a1502d76 | 1618 | skc->skc_flags |= KMC_VMEM; |
a1502d76 BB |
1619 | } |
1620 | ||
48e0606a BB |
1621 | rc = spl_slab_size(skc, &skc->skc_slab_objs, &skc->skc_slab_size); |
1622 | if (rc) | |
b17edc10 | 1623 | SGOTO(out, rc); |
4afaaefa BB |
1624 | |
1625 | rc = spl_magazine_create(skc); | |
48e0606a | 1626 | if (rc) |
b17edc10 | 1627 | SGOTO(out, rc); |
2fb9b26a | 1628 | |
0936c344 BB |
1629 | if (spl_kmem_cache_expire & KMC_EXPIRE_AGE) |
1630 | skc->skc_taskqid = taskq_dispatch_delay(spl_kmem_cache_taskq, | |
1631 | spl_cache_age, skc, TQ_SLEEP, | |
1632 | ddi_get_lbolt() + skc->skc_delay / 3 * HZ); | |
ea3e6ca9 | 1633 | |
2fb9b26a | 1634 | down_write(&spl_kmem_cache_sem); |
e9d7a2be | 1635 | list_add_tail(&skc->skc_list, &spl_kmem_cache_list); |
2fb9b26a BB |
1636 | up_write(&spl_kmem_cache_sem); |
1637 | ||
b17edc10 | 1638 | SRETURN(skc); |
48e0606a BB |
1639 | out: |
1640 | kmem_free(skc->skc_name, skc->skc_name_size); | |
1641 | kmem_free(skc, sizeof(*skc)); | |
b17edc10 | 1642 | SRETURN(NULL); |
f1ca4da6 | 1643 | } |
2fb9b26a | 1644 | EXPORT_SYMBOL(spl_kmem_cache_create); |
f1ca4da6 | 1645 | |
2b354302 BB |
1646 | /* |
1647 | * Register a move callback to for cache defragmentation. | |
1648 | * XXX: Unimplemented but harmless to stub out for now. | |
1649 | */ | |
1650 | void | |
6576a1a7 | 1651 | spl_kmem_cache_set_move(spl_kmem_cache_t *skc, |
2b354302 BB |
1652 | kmem_cbrc_t (move)(void *, void *, size_t, void *)) |
1653 | { | |
1654 | ASSERT(move != NULL); | |
1655 | } | |
1656 | EXPORT_SYMBOL(spl_kmem_cache_set_move); | |
1657 | ||
ea3e6ca9 | 1658 | /* |
ecc39810 | 1659 | * Destroy a cache and all objects associated with the cache. |
ea3e6ca9 | 1660 | */ |
2fb9b26a BB |
1661 | void |
1662 | spl_kmem_cache_destroy(spl_kmem_cache_t *skc) | |
f1ca4da6 | 1663 | { |
ea3e6ca9 | 1664 | DECLARE_WAIT_QUEUE_HEAD(wq); |
a10287e0 | 1665 | taskqid_t id; |
b17edc10 | 1666 | SENTRY; |
f1ca4da6 | 1667 | |
e9d7a2be BB |
1668 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1669 | ||
1670 | down_write(&spl_kmem_cache_sem); | |
1671 | list_del_init(&skc->skc_list); | |
1672 | up_write(&spl_kmem_cache_sem); | |
2fb9b26a | 1673 | |
a10287e0 | 1674 | /* Cancel any and wait for any pending delayed tasks */ |
64c075c3 | 1675 | VERIFY(!test_and_set_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
9b1b8e4c | 1676 | |
a10287e0 BB |
1677 | spin_lock(&skc->skc_lock); |
1678 | id = skc->skc_taskqid; | |
1679 | spin_unlock(&skc->skc_lock); | |
1680 | ||
1681 | taskq_cancel_id(spl_kmem_cache_taskq, id); | |
ea3e6ca9 BB |
1682 | |
1683 | /* Wait until all current callers complete, this is mainly | |
1684 | * to catch the case where a low memory situation triggers a | |
1685 | * cache reaping action which races with this destroy. */ | |
1686 | wait_event(wq, atomic_read(&skc->skc_ref) == 0); | |
1687 | ||
4afaaefa | 1688 | spl_magazine_destroy(skc); |
37db7d8c | 1689 | spl_slab_reclaim(skc, 0, 1); |
d46630e0 | 1690 | spin_lock(&skc->skc_lock); |
d6a26c6a | 1691 | |
2fb9b26a | 1692 | /* Validate there are no objects in use and free all the |
4afaaefa | 1693 | * spl_kmem_slab_t, spl_kmem_obj_t, and object buffers. */ |
ea3e6ca9 BB |
1694 | ASSERT3U(skc->skc_slab_alloc, ==, 0); |
1695 | ASSERT3U(skc->skc_obj_alloc, ==, 0); | |
1696 | ASSERT3U(skc->skc_slab_total, ==, 0); | |
1697 | ASSERT3U(skc->skc_obj_total, ==, 0); | |
e2dcc6e2 | 1698 | ASSERT3U(skc->skc_obj_emergency, ==, 0); |
2fb9b26a | 1699 | ASSERT(list_empty(&skc->skc_complete_list)); |
a1502d76 | 1700 | |
2fb9b26a | 1701 | kmem_free(skc->skc_name, skc->skc_name_size); |
d46630e0 | 1702 | spin_unlock(&skc->skc_lock); |
ff449ac4 | 1703 | |
4afaaefa | 1704 | kmem_free(skc, sizeof(*skc)); |
2fb9b26a | 1705 | |
b17edc10 | 1706 | SEXIT; |
f1ca4da6 | 1707 | } |
2fb9b26a | 1708 | EXPORT_SYMBOL(spl_kmem_cache_destroy); |
f1ca4da6 | 1709 | |
ea3e6ca9 BB |
1710 | /* |
1711 | * Allocate an object from a slab attached to the cache. This is used to | |
1712 | * repopulate the per-cpu magazine caches in batches when they run low. | |
1713 | */ | |
4afaaefa BB |
1714 | static void * |
1715 | spl_cache_obj(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks) | |
f1ca4da6 | 1716 | { |
2fb9b26a | 1717 | spl_kmem_obj_t *sko; |
f1ca4da6 | 1718 | |
e9d7a2be BB |
1719 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1720 | ASSERT(sks->sks_magic == SKS_MAGIC); | |
4afaaefa | 1721 | ASSERT(spin_is_locked(&skc->skc_lock)); |
2fb9b26a | 1722 | |
a1502d76 | 1723 | sko = list_entry(sks->sks_free_list.next, spl_kmem_obj_t, sko_list); |
4afaaefa BB |
1724 | ASSERT(sko->sko_magic == SKO_MAGIC); |
1725 | ASSERT(sko->sko_addr != NULL); | |
2fb9b26a | 1726 | |
a1502d76 | 1727 | /* Remove from sks_free_list */ |
4afaaefa | 1728 | list_del_init(&sko->sko_list); |
2fb9b26a | 1729 | |
4afaaefa BB |
1730 | sks->sks_age = jiffies; |
1731 | sks->sks_ref++; | |
1732 | skc->skc_obj_alloc++; | |
2fb9b26a | 1733 | |
4afaaefa BB |
1734 | /* Track max obj usage statistics */ |
1735 | if (skc->skc_obj_alloc > skc->skc_obj_max) | |
1736 | skc->skc_obj_max = skc->skc_obj_alloc; | |
2fb9b26a | 1737 | |
4afaaefa BB |
1738 | /* Track max slab usage statistics */ |
1739 | if (sks->sks_ref == 1) { | |
1740 | skc->skc_slab_alloc++; | |
f1ca4da6 | 1741 | |
4afaaefa BB |
1742 | if (skc->skc_slab_alloc > skc->skc_slab_max) |
1743 | skc->skc_slab_max = skc->skc_slab_alloc; | |
2fb9b26a BB |
1744 | } |
1745 | ||
4afaaefa BB |
1746 | return sko->sko_addr; |
1747 | } | |
c30df9c8 | 1748 | |
ea3e6ca9 | 1749 | /* |
e2dcc6e2 BB |
1750 | * Generic slab allocation function to run by the global work queues. |
1751 | * It is responsible for allocating a new slab, linking it in to the list | |
1752 | * of partial slabs, and then waking any waiters. | |
4afaaefa | 1753 | */ |
e2dcc6e2 BB |
1754 | static void |
1755 | spl_cache_grow_work(void *data) | |
4afaaefa | 1756 | { |
33e94ef1 | 1757 | spl_kmem_alloc_t *ska = (spl_kmem_alloc_t *)data; |
e2dcc6e2 | 1758 | spl_kmem_cache_t *skc = ska->ska_cache; |
e9d7a2be | 1759 | spl_kmem_slab_t *sks; |
e2dcc6e2 BB |
1760 | |
1761 | sks = spl_slab_alloc(skc, ska->ska_flags | __GFP_NORETRY | KM_NODEBUG); | |
1762 | spin_lock(&skc->skc_lock); | |
1763 | if (sks) { | |
1764 | skc->skc_slab_total++; | |
1765 | skc->skc_obj_total += sks->sks_objs; | |
1766 | list_add_tail(&sks->sks_list, &skc->skc_partial_list); | |
1767 | } | |
1768 | ||
1769 | atomic_dec(&skc->skc_ref); | |
1770 | clear_bit(KMC_BIT_GROWING, &skc->skc_flags); | |
165f13c3 | 1771 | clear_bit(KMC_BIT_DEADLOCKED, &skc->skc_flags); |
e2dcc6e2 BB |
1772 | wake_up_all(&skc->skc_waitq); |
1773 | spin_unlock(&skc->skc_lock); | |
1774 | ||
1775 | kfree(ska); | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Returns non-zero when a new slab should be available. | |
1780 | */ | |
1781 | static int | |
1782 | spl_cache_grow_wait(spl_kmem_cache_t *skc) | |
1783 | { | |
1784 | return !test_bit(KMC_BIT_GROWING, &skc->skc_flags); | |
1785 | } | |
1786 | ||
dc1b3022 BB |
1787 | static int |
1788 | spl_cache_reclaim_wait(void *word) | |
1789 | { | |
1790 | schedule(); | |
1791 | return 0; | |
1792 | } | |
1793 | ||
e2dcc6e2 BB |
1794 | /* |
1795 | * No available objects on any slabs, create a new slab. | |
1796 | */ | |
1797 | static int | |
1798 | spl_cache_grow(spl_kmem_cache_t *skc, int flags, void **obj) | |
1799 | { | |
165f13c3 | 1800 | int remaining, rc; |
b17edc10 | 1801 | SENTRY; |
f1ca4da6 | 1802 | |
e9d7a2be | 1803 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 | 1804 | might_sleep(); |
e2dcc6e2 | 1805 | *obj = NULL; |
e9d7a2be | 1806 | |
ea3e6ca9 | 1807 | /* |
dc1b3022 BB |
1808 | * Before allocating a new slab wait for any reaping to complete and |
1809 | * then return so the local magazine can be rechecked for new objects. | |
ea3e6ca9 | 1810 | */ |
dc1b3022 BB |
1811 | if (test_bit(KMC_BIT_REAPING, &skc->skc_flags)) { |
1812 | rc = wait_on_bit(&skc->skc_flags, KMC_BIT_REAPING, | |
1813 | spl_cache_reclaim_wait, TASK_UNINTERRUPTIBLE); | |
1814 | SRETURN(rc ? rc : -EAGAIN); | |
1815 | } | |
2fb9b26a | 1816 | |
e2dcc6e2 BB |
1817 | /* |
1818 | * This is handled by dispatching a work request to the global work | |
1819 | * queue. This allows us to asynchronously allocate a new slab while | |
1820 | * retaining the ability to safely fall back to a smaller synchronous | |
1821 | * allocations to ensure forward progress is always maintained. | |
1822 | */ | |
1823 | if (test_and_set_bit(KMC_BIT_GROWING, &skc->skc_flags) == 0) { | |
1824 | spl_kmem_alloc_t *ska; | |
4afaaefa | 1825 | |
e2dcc6e2 BB |
1826 | ska = kmalloc(sizeof(*ska), flags); |
1827 | if (ska == NULL) { | |
1828 | clear_bit(KMC_BIT_GROWING, &skc->skc_flags); | |
1829 | wake_up_all(&skc->skc_waitq); | |
1830 | SRETURN(-ENOMEM); | |
1831 | } | |
4afaaefa | 1832 | |
e2dcc6e2 BB |
1833 | atomic_inc(&skc->skc_ref); |
1834 | ska->ska_cache = skc; | |
043f9b57 | 1835 | ska->ska_flags = flags & ~__GFP_FS; |
33e94ef1 BB |
1836 | taskq_init_ent(&ska->ska_tqe); |
1837 | taskq_dispatch_ent(spl_kmem_cache_taskq, | |
1838 | spl_cache_grow_work, ska, 0, &ska->ska_tqe); | |
e2dcc6e2 BB |
1839 | } |
1840 | ||
1841 | /* | |
165f13c3 BB |
1842 | * The goal here is to only detect the rare case where a virtual slab |
1843 | * allocation has deadlocked. We must be careful to minimize the use | |
1844 | * of emergency objects which are more expensive to track. Therefore, | |
1845 | * we set a very long timeout for the asynchronous allocation and if | |
1846 | * the timeout is reached the cache is flagged as deadlocked. From | |
1847 | * this point only new emergency objects will be allocated until the | |
1848 | * asynchronous allocation completes and clears the deadlocked flag. | |
e2dcc6e2 | 1849 | */ |
165f13c3 BB |
1850 | if (test_bit(KMC_BIT_DEADLOCKED, &skc->skc_flags)) { |
1851 | rc = spl_emergency_alloc(skc, flags, obj); | |
1852 | } else { | |
1853 | remaining = wait_event_timeout(skc->skc_waitq, | |
1854 | spl_cache_grow_wait(skc), HZ); | |
1855 | ||
1856 | if (!remaining && test_bit(KMC_BIT_VMEM, &skc->skc_flags)) { | |
1857 | spin_lock(&skc->skc_lock); | |
1858 | if (test_bit(KMC_BIT_GROWING, &skc->skc_flags)) { | |
1859 | set_bit(KMC_BIT_DEADLOCKED, &skc->skc_flags); | |
1860 | skc->skc_obj_deadlock++; | |
1861 | } | |
1862 | spin_unlock(&skc->skc_lock); | |
1863 | } | |
cb5c2ace | 1864 | |
165f13c3 | 1865 | rc = -ENOMEM; |
cb5c2ace | 1866 | } |
e2dcc6e2 BB |
1867 | |
1868 | SRETURN(rc); | |
f1ca4da6 BB |
1869 | } |
1870 | ||
ea3e6ca9 | 1871 | /* |
e2dcc6e2 BB |
1872 | * Refill a per-cpu magazine with objects from the slabs for this cache. |
1873 | * Ideally the magazine can be repopulated using existing objects which have | |
1874 | * been released, however if we are unable to locate enough free objects new | |
1875 | * slabs of objects will be created. On success NULL is returned, otherwise | |
1876 | * the address of a single emergency object is returned for use by the caller. | |
ea3e6ca9 | 1877 | */ |
e2dcc6e2 | 1878 | static void * |
4afaaefa | 1879 | spl_cache_refill(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flags) |
f1ca4da6 | 1880 | { |
e9d7a2be | 1881 | spl_kmem_slab_t *sks; |
e2dcc6e2 BB |
1882 | int count = 0, rc, refill; |
1883 | void *obj = NULL; | |
b17edc10 | 1884 | SENTRY; |
f1ca4da6 | 1885 | |
e9d7a2be BB |
1886 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1887 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
1888 | ||
e9d7a2be | 1889 | refill = MIN(skm->skm_refill, skm->skm_size - skm->skm_avail); |
d46630e0 | 1890 | spin_lock(&skc->skc_lock); |
ff449ac4 | 1891 | |
4afaaefa | 1892 | while (refill > 0) { |
ea3e6ca9 | 1893 | /* No slabs available we may need to grow the cache */ |
4afaaefa BB |
1894 | if (list_empty(&skc->skc_partial_list)) { |
1895 | spin_unlock(&skc->skc_lock); | |
ff449ac4 | 1896 | |
e2dcc6e2 BB |
1897 | local_irq_enable(); |
1898 | rc = spl_cache_grow(skc, flags, &obj); | |
1899 | local_irq_disable(); | |
1900 | ||
1901 | /* Emergency object for immediate use by caller */ | |
1902 | if (rc == 0 && obj != NULL) | |
1903 | SRETURN(obj); | |
1904 | ||
1905 | if (rc) | |
b17edc10 | 1906 | SGOTO(out, rc); |
4afaaefa BB |
1907 | |
1908 | /* Rescheduled to different CPU skm is not local */ | |
1909 | if (skm != skc->skc_mag[smp_processor_id()]) | |
b17edc10 | 1910 | SGOTO(out, rc); |
e9d7a2be BB |
1911 | |
1912 | /* Potentially rescheduled to the same CPU but | |
ecc39810 | 1913 | * allocations may have occurred from this CPU while |
e9d7a2be BB |
1914 | * we were sleeping so recalculate max refill. */ |
1915 | refill = MIN(refill, skm->skm_size - skm->skm_avail); | |
4afaaefa BB |
1916 | |
1917 | spin_lock(&skc->skc_lock); | |
1918 | continue; | |
1919 | } | |
d46630e0 | 1920 | |
4afaaefa BB |
1921 | /* Grab the next available slab */ |
1922 | sks = list_entry((&skc->skc_partial_list)->next, | |
1923 | spl_kmem_slab_t, sks_list); | |
1924 | ASSERT(sks->sks_magic == SKS_MAGIC); | |
1925 | ASSERT(sks->sks_ref < sks->sks_objs); | |
1926 | ASSERT(!list_empty(&sks->sks_free_list)); | |
d46630e0 | 1927 | |
4afaaefa | 1928 | /* Consume as many objects as needed to refill the requested |
e9d7a2be | 1929 | * cache. We must also be careful not to overfill it. */ |
e2dcc6e2 | 1930 | while (sks->sks_ref < sks->sks_objs && refill-- > 0 && ++count) { |
e9d7a2be | 1931 | ASSERT(skm->skm_avail < skm->skm_size); |
e2dcc6e2 | 1932 | ASSERT(count < skm->skm_size); |
4afaaefa | 1933 | skm->skm_objs[skm->skm_avail++]=spl_cache_obj(skc,sks); |
e9d7a2be | 1934 | } |
f1ca4da6 | 1935 | |
4afaaefa BB |
1936 | /* Move slab to skc_complete_list when full */ |
1937 | if (sks->sks_ref == sks->sks_objs) { | |
1938 | list_del(&sks->sks_list); | |
1939 | list_add(&sks->sks_list, &skc->skc_complete_list); | |
2fb9b26a BB |
1940 | } |
1941 | } | |
57d86234 | 1942 | |
4afaaefa BB |
1943 | spin_unlock(&skc->skc_lock); |
1944 | out: | |
e2dcc6e2 | 1945 | SRETURN(NULL); |
4afaaefa BB |
1946 | } |
1947 | ||
ea3e6ca9 BB |
1948 | /* |
1949 | * Release an object back to the slab from which it came. | |
1950 | */ | |
4afaaefa BB |
1951 | static void |
1952 | spl_cache_shrink(spl_kmem_cache_t *skc, void *obj) | |
1953 | { | |
e9d7a2be | 1954 | spl_kmem_slab_t *sks = NULL; |
4afaaefa | 1955 | spl_kmem_obj_t *sko = NULL; |
b17edc10 | 1956 | SENTRY; |
4afaaefa | 1957 | |
e9d7a2be | 1958 | ASSERT(skc->skc_magic == SKC_MAGIC); |
4afaaefa BB |
1959 | ASSERT(spin_is_locked(&skc->skc_lock)); |
1960 | ||
8b45dda2 | 1961 | sko = spl_sko_from_obj(skc, obj); |
a1502d76 | 1962 | ASSERT(sko->sko_magic == SKO_MAGIC); |
4afaaefa | 1963 | sks = sko->sko_slab; |
a1502d76 | 1964 | ASSERT(sks->sks_magic == SKS_MAGIC); |
2fb9b26a | 1965 | ASSERT(sks->sks_cache == skc); |
2fb9b26a | 1966 | list_add(&sko->sko_list, &sks->sks_free_list); |
d6a26c6a | 1967 | |
2fb9b26a | 1968 | sks->sks_age = jiffies; |
4afaaefa | 1969 | sks->sks_ref--; |
2fb9b26a | 1970 | skc->skc_obj_alloc--; |
f1ca4da6 | 1971 | |
2fb9b26a | 1972 | /* Move slab to skc_partial_list when no longer full. Slabs |
4afaaefa BB |
1973 | * are added to the head to keep the partial list is quasi-full |
1974 | * sorted order. Fuller at the head, emptier at the tail. */ | |
1975 | if (sks->sks_ref == (sks->sks_objs - 1)) { | |
2fb9b26a BB |
1976 | list_del(&sks->sks_list); |
1977 | list_add(&sks->sks_list, &skc->skc_partial_list); | |
1978 | } | |
f1ca4da6 | 1979 | |
ecc39810 | 1980 | /* Move empty slabs to the end of the partial list so |
4afaaefa BB |
1981 | * they can be easily found and freed during reclamation. */ |
1982 | if (sks->sks_ref == 0) { | |
2fb9b26a BB |
1983 | list_del(&sks->sks_list); |
1984 | list_add_tail(&sks->sks_list, &skc->skc_partial_list); | |
1985 | skc->skc_slab_alloc--; | |
1986 | } | |
1987 | ||
b17edc10 | 1988 | SEXIT; |
4afaaefa BB |
1989 | } |
1990 | ||
ea3e6ca9 BB |
1991 | /* |
1992 | * Allocate an object from the per-cpu magazine, or if the magazine | |
1993 | * is empty directly allocate from a slab and repopulate the magazine. | |
1994 | */ | |
4afaaefa BB |
1995 | void * |
1996 | spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags) | |
1997 | { | |
1998 | spl_kmem_magazine_t *skm; | |
1999 | unsigned long irq_flags; | |
2000 | void *obj = NULL; | |
b17edc10 | 2001 | SENTRY; |
4afaaefa | 2002 | |
e9d7a2be | 2003 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
2004 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
2005 | ASSERT(flags & KM_SLEEP); | |
2006 | atomic_inc(&skc->skc_ref); | |
4afaaefa BB |
2007 | local_irq_save(irq_flags); |
2008 | ||
2009 | restart: | |
2010 | /* Safe to update per-cpu structure without lock, but | |
ecc39810 | 2011 | * in the restart case we must be careful to reacquire |
4afaaefa BB |
2012 | * the local magazine since this may have changed |
2013 | * when we need to grow the cache. */ | |
2014 | skm = skc->skc_mag[smp_processor_id()]; | |
e9d7a2be BB |
2015 | ASSERTF(skm->skm_magic == SKM_MAGIC, "%x != %x: %s/%p/%p %x/%x/%x\n", |
2016 | skm->skm_magic, SKM_MAGIC, skc->skc_name, skc, skm, | |
2017 | skm->skm_size, skm->skm_refill, skm->skm_avail); | |
4afaaefa BB |
2018 | |
2019 | if (likely(skm->skm_avail)) { | |
2020 | /* Object available in CPU cache, use it */ | |
2021 | obj = skm->skm_objs[--skm->skm_avail]; | |
ea3e6ca9 | 2022 | skm->skm_age = jiffies; |
4afaaefa | 2023 | } else { |
e2dcc6e2 BB |
2024 | obj = spl_cache_refill(skc, skm, flags); |
2025 | if (obj == NULL) | |
2026 | SGOTO(restart, obj = NULL); | |
4afaaefa BB |
2027 | } |
2028 | ||
2029 | local_irq_restore(irq_flags); | |
fece7c99 | 2030 | ASSERT(obj); |
8b45dda2 | 2031 | ASSERT(IS_P2ALIGNED(obj, skc->skc_obj_align)); |
4afaaefa BB |
2032 | |
2033 | /* Pre-emptively migrate object to CPU L1 cache */ | |
2034 | prefetchw(obj); | |
ea3e6ca9 | 2035 | atomic_dec(&skc->skc_ref); |
4afaaefa | 2036 | |
b17edc10 | 2037 | SRETURN(obj); |
4afaaefa BB |
2038 | } |
2039 | EXPORT_SYMBOL(spl_kmem_cache_alloc); | |
2040 | ||
ea3e6ca9 BB |
2041 | /* |
2042 | * Free an object back to the local per-cpu magazine, there is no | |
2043 | * guarantee that this is the same magazine the object was originally | |
2044 | * allocated from. We may need to flush entire from the magazine | |
2045 | * back to the slabs to make space. | |
2046 | */ | |
4afaaefa BB |
2047 | void |
2048 | spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj) | |
2049 | { | |
2050 | spl_kmem_magazine_t *skm; | |
2051 | unsigned long flags; | |
b17edc10 | 2052 | SENTRY; |
4afaaefa | 2053 | |
e9d7a2be | 2054 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
2055 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
2056 | atomic_inc(&skc->skc_ref); | |
e2dcc6e2 BB |
2057 | |
2058 | /* | |
a1af8fb1 BB |
2059 | * Only virtual slabs may have emergency objects and these objects |
2060 | * are guaranteed to have physical addresses. They must be removed | |
2061 | * from the tree of emergency objects and the freed. | |
e2dcc6e2 | 2062 | */ |
a1af8fb1 BB |
2063 | if ((skc->skc_flags & KMC_VMEM) && !kmem_virt(obj)) |
2064 | SGOTO(out, spl_emergency_free(skc, obj)); | |
e2dcc6e2 | 2065 | |
4afaaefa BB |
2066 | local_irq_save(flags); |
2067 | ||
2068 | /* Safe to update per-cpu structure without lock, but | |
2069 | * no remote memory allocation tracking is being performed | |
2070 | * it is entirely possible to allocate an object from one | |
2071 | * CPU cache and return it to another. */ | |
2072 | skm = skc->skc_mag[smp_processor_id()]; | |
e9d7a2be | 2073 | ASSERT(skm->skm_magic == SKM_MAGIC); |
4afaaefa BB |
2074 | |
2075 | /* Per-CPU cache full, flush it to make space */ | |
2076 | if (unlikely(skm->skm_avail >= skm->skm_size)) | |
d4899f47 | 2077 | spl_cache_flush(skc, skm, skm->skm_refill); |
4afaaefa BB |
2078 | |
2079 | /* Available space in cache, use it */ | |
2080 | skm->skm_objs[skm->skm_avail++] = obj; | |
2081 | ||
2082 | local_irq_restore(flags); | |
e2dcc6e2 | 2083 | out: |
ea3e6ca9 | 2084 | atomic_dec(&skc->skc_ref); |
4afaaefa | 2085 | |
b17edc10 | 2086 | SEXIT; |
f1ca4da6 | 2087 | } |
2fb9b26a | 2088 | EXPORT_SYMBOL(spl_kmem_cache_free); |
5c2bb9b2 | 2089 | |
ea3e6ca9 | 2090 | /* |
ecc39810 BB |
2091 | * The generic shrinker function for all caches. Under Linux a shrinker |
2092 | * may not be tightly coupled with a slab cache. In fact Linux always | |
2093 | * systematically tries calling all registered shrinker callbacks which | |
ea3e6ca9 BB |
2094 | * report that they contain unused objects. Because of this we only |
2095 | * register one shrinker function in the shim layer for all slab caches. | |
2096 | * We always attempt to shrink all caches when this generic shrinker | |
2097 | * is called. The shrinker should return the number of free objects | |
2098 | * in the cache when called with nr_to_scan == 0 but not attempt to | |
2099 | * free any objects. When nr_to_scan > 0 it is a request that nr_to_scan | |
cef7605c PS |
2100 | * objects should be freed, which differs from Solaris semantics. |
2101 | * Solaris semantics are to free all available objects which may (and | |
2102 | * probably will) be more objects than the requested nr_to_scan. | |
ea3e6ca9 | 2103 | */ |
a55bcaad BB |
2104 | static int |
2105 | __spl_kmem_cache_generic_shrinker(struct shrinker *shrink, | |
2106 | struct shrink_control *sc) | |
2fb9b26a | 2107 | { |
e9d7a2be | 2108 | spl_kmem_cache_t *skc; |
ea3e6ca9 | 2109 | int unused = 0; |
5c2bb9b2 | 2110 | |
e9d7a2be | 2111 | down_read(&spl_kmem_cache_sem); |
ea3e6ca9 | 2112 | list_for_each_entry(skc, &spl_kmem_cache_list, skc_list) { |
a55bcaad | 2113 | if (sc->nr_to_scan) |
cef7605c PS |
2114 | spl_kmem_cache_reap_now(skc, |
2115 | MAX(sc->nr_to_scan >> fls64(skc->skc_slab_objs), 1)); | |
ea3e6ca9 BB |
2116 | |
2117 | /* | |
2118 | * Presume everything alloc'ed in reclaimable, this ensures | |
2119 | * we are called again with nr_to_scan > 0 so can try and | |
2120 | * reclaim. The exact number is not important either so | |
2121 | * we forgo taking this already highly contented lock. | |
2122 | */ | |
2123 | unused += skc->skc_obj_alloc; | |
2124 | } | |
e9d7a2be | 2125 | up_read(&spl_kmem_cache_sem); |
2fb9b26a | 2126 | |
ea3e6ca9 | 2127 | return (unused * sysctl_vfs_cache_pressure) / 100; |
5c2bb9b2 | 2128 | } |
5c2bb9b2 | 2129 | |
a55bcaad BB |
2130 | SPL_SHRINKER_CALLBACK_WRAPPER(spl_kmem_cache_generic_shrinker); |
2131 | ||
ea3e6ca9 BB |
2132 | /* |
2133 | * Call the registered reclaim function for a cache. Depending on how | |
2134 | * many and which objects are released it may simply repopulate the | |
2135 | * local magazine which will then need to age-out. Objects which cannot | |
2136 | * fit in the magazine we will be released back to their slabs which will | |
2137 | * also need to age out before being release. This is all just best | |
2138 | * effort and we do not want to thrash creating and destroying slabs. | |
2139 | */ | |
57d86234 | 2140 | void |
cef7605c | 2141 | spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count) |
57d86234 | 2142 | { |
b17edc10 | 2143 | SENTRY; |
e9d7a2be BB |
2144 | |
2145 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
ea3e6ca9 | 2146 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
2fb9b26a | 2147 | |
ea3e6ca9 BB |
2148 | /* Prevent concurrent cache reaping when contended */ |
2149 | if (test_and_set_bit(KMC_BIT_REAPING, &skc->skc_flags)) { | |
b17edc10 | 2150 | SEXIT; |
ea3e6ca9 BB |
2151 | return; |
2152 | } | |
2fb9b26a | 2153 | |
ea3e6ca9 | 2154 | atomic_inc(&skc->skc_ref); |
4afaaefa | 2155 | |
b78d4b9d BB |
2156 | /* |
2157 | * When a reclaim function is available it may be invoked repeatedly | |
2158 | * until at least a single slab can be freed. This ensures that we | |
2159 | * do free memory back to the system. This helps minimize the chance | |
2160 | * of an OOM event when the bulk of memory is used by the slab. | |
2161 | * | |
2162 | * When free slabs are already available the reclaim callback will be | |
2163 | * skipped. Additionally, if no forward progress is detected despite | |
2164 | * a reclaim function the cache will be skipped to avoid deadlock. | |
2165 | * | |
2166 | * Longer term this would be the correct place to add the code which | |
2167 | * repacks the slabs in order minimize fragmentation. | |
2168 | */ | |
2169 | if (skc->skc_reclaim) { | |
2170 | uint64_t objects = UINT64_MAX; | |
2171 | int do_reclaim; | |
2172 | ||
2173 | do { | |
2174 | spin_lock(&skc->skc_lock); | |
2175 | do_reclaim = | |
2176 | (skc->skc_slab_total > 0) && | |
2177 | ((skc->skc_slab_total - skc->skc_slab_alloc) == 0) && | |
2178 | (skc->skc_obj_alloc < objects); | |
2179 | ||
2180 | objects = skc->skc_obj_alloc; | |
2181 | spin_unlock(&skc->skc_lock); | |
2182 | ||
2183 | if (do_reclaim) | |
2184 | skc->skc_reclaim(skc->skc_private); | |
2185 | ||
2186 | } while (do_reclaim); | |
2187 | } | |
4afaaefa | 2188 | |
0936c344 BB |
2189 | /* Reclaim from the magazine then the slabs ignoring age and delay. */ |
2190 | if (spl_kmem_cache_expire & KMC_EXPIRE_MEM) { | |
2191 | spl_kmem_magazine_t *skm; | |
2192 | int i; | |
2193 | ||
2194 | for_each_online_cpu(i) { | |
2195 | skm = skc->skc_mag[i]; | |
2196 | spl_cache_flush(skc, skm, skm->skm_avail); | |
2197 | } | |
2198 | } | |
2199 | ||
c0e0fc14 | 2200 | spl_slab_reclaim(skc, count, 1); |
ea3e6ca9 | 2201 | clear_bit(KMC_BIT_REAPING, &skc->skc_flags); |
dc1b3022 BB |
2202 | smp_mb__after_clear_bit(); |
2203 | wake_up_bit(&skc->skc_flags, KMC_BIT_REAPING); | |
2204 | ||
ea3e6ca9 | 2205 | atomic_dec(&skc->skc_ref); |
4afaaefa | 2206 | |
b17edc10 | 2207 | SEXIT; |
57d86234 | 2208 | } |
2fb9b26a | 2209 | EXPORT_SYMBOL(spl_kmem_cache_reap_now); |
57d86234 | 2210 | |
ea3e6ca9 BB |
2211 | /* |
2212 | * Reap all free slabs from all registered caches. | |
2213 | */ | |
f1b59d26 | 2214 | void |
2fb9b26a | 2215 | spl_kmem_reap(void) |
937879f1 | 2216 | { |
a55bcaad BB |
2217 | struct shrink_control sc; |
2218 | ||
2219 | sc.nr_to_scan = KMC_REAP_CHUNK; | |
2220 | sc.gfp_mask = GFP_KERNEL; | |
2221 | ||
2222 | __spl_kmem_cache_generic_shrinker(NULL, &sc); | |
f1ca4da6 | 2223 | } |
2fb9b26a | 2224 | EXPORT_SYMBOL(spl_kmem_reap); |
5d86345d | 2225 | |
ff449ac4 | 2226 | #if defined(DEBUG_KMEM) && defined(DEBUG_KMEM_TRACKING) |
c6dc93d6 | 2227 | static char * |
4afaaefa | 2228 | spl_sprintf_addr(kmem_debug_t *kd, char *str, int len, int min) |
d6a26c6a | 2229 | { |
e9d7a2be | 2230 | int size = ((len - 1) < kd->kd_size) ? (len - 1) : kd->kd_size; |
d6a26c6a BB |
2231 | int i, flag = 1; |
2232 | ||
2233 | ASSERT(str != NULL && len >= 17); | |
e9d7a2be | 2234 | memset(str, 0, len); |
d6a26c6a BB |
2235 | |
2236 | /* Check for a fully printable string, and while we are at | |
2237 | * it place the printable characters in the passed buffer. */ | |
2238 | for (i = 0; i < size; i++) { | |
e9d7a2be BB |
2239 | str[i] = ((char *)(kd->kd_addr))[i]; |
2240 | if (isprint(str[i])) { | |
2241 | continue; | |
2242 | } else { | |
2243 | /* Minimum number of printable characters found | |
2244 | * to make it worthwhile to print this as ascii. */ | |
2245 | if (i > min) | |
2246 | break; | |
2247 | ||
2248 | flag = 0; | |
2249 | break; | |
2250 | } | |
d6a26c6a BB |
2251 | } |
2252 | ||
2253 | if (!flag) { | |
2254 | sprintf(str, "%02x%02x%02x%02x%02x%02x%02x%02x", | |
2255 | *((uint8_t *)kd->kd_addr), | |
2256 | *((uint8_t *)kd->kd_addr + 2), | |
2257 | *((uint8_t *)kd->kd_addr + 4), | |
2258 | *((uint8_t *)kd->kd_addr + 6), | |
2259 | *((uint8_t *)kd->kd_addr + 8), | |
2260 | *((uint8_t *)kd->kd_addr + 10), | |
2261 | *((uint8_t *)kd->kd_addr + 12), | |
2262 | *((uint8_t *)kd->kd_addr + 14)); | |
2263 | } | |
2264 | ||
2265 | return str; | |
2266 | } | |
2267 | ||
a1502d76 BB |
2268 | static int |
2269 | spl_kmem_init_tracking(struct list_head *list, spinlock_t *lock, int size) | |
2270 | { | |
2271 | int i; | |
b17edc10 | 2272 | SENTRY; |
a1502d76 BB |
2273 | |
2274 | spin_lock_init(lock); | |
2275 | INIT_LIST_HEAD(list); | |
2276 | ||
2277 | for (i = 0; i < size; i++) | |
2278 | INIT_HLIST_HEAD(&kmem_table[i]); | |
2279 | ||
b17edc10 | 2280 | SRETURN(0); |
a1502d76 BB |
2281 | } |
2282 | ||
ff449ac4 BB |
2283 | static void |
2284 | spl_kmem_fini_tracking(struct list_head *list, spinlock_t *lock) | |
5d86345d | 2285 | { |
2fb9b26a BB |
2286 | unsigned long flags; |
2287 | kmem_debug_t *kd; | |
2288 | char str[17]; | |
b17edc10 | 2289 | SENTRY; |
2fb9b26a | 2290 | |
ff449ac4 BB |
2291 | spin_lock_irqsave(lock, flags); |
2292 | if (!list_empty(list)) | |
a0f6da3d BB |
2293 | printk(KERN_WARNING "%-16s %-5s %-16s %s:%s\n", "address", |
2294 | "size", "data", "func", "line"); | |
2fb9b26a | 2295 | |
ff449ac4 | 2296 | list_for_each_entry(kd, list, kd_list) |
a0f6da3d | 2297 | printk(KERN_WARNING "%p %-5d %-16s %s:%d\n", kd->kd_addr, |
b6b2acc6 | 2298 | (int)kd->kd_size, spl_sprintf_addr(kd, str, 17, 8), |
2fb9b26a BB |
2299 | kd->kd_func, kd->kd_line); |
2300 | ||
ff449ac4 | 2301 | spin_unlock_irqrestore(lock, flags); |
b17edc10 | 2302 | SEXIT; |
ff449ac4 BB |
2303 | } |
2304 | #else /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */ | |
a1502d76 | 2305 | #define spl_kmem_init_tracking(list, lock, size) |
ff449ac4 BB |
2306 | #define spl_kmem_fini_tracking(list, lock) |
2307 | #endif /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */ | |
2308 | ||
36b313da BB |
2309 | static void |
2310 | spl_kmem_init_globals(void) | |
2311 | { | |
2312 | struct zone *zone; | |
2313 | ||
2314 | /* For now all zones are includes, it may be wise to restrict | |
2315 | * this to normal and highmem zones if we see problems. */ | |
2316 | for_each_zone(zone) { | |
2317 | ||
2318 | if (!populated_zone(zone)) | |
2319 | continue; | |
2320 | ||
baf2979e BB |
2321 | minfree += min_wmark_pages(zone); |
2322 | desfree += low_wmark_pages(zone); | |
2323 | lotsfree += high_wmark_pages(zone); | |
36b313da | 2324 | } |
4ab13d3b BB |
2325 | |
2326 | /* Solaris default values */ | |
96dded38 BB |
2327 | swapfs_minfree = MAX(2*1024*1024 >> PAGE_SHIFT, physmem >> 3); |
2328 | swapfs_reserve = MIN(4*1024*1024 >> PAGE_SHIFT, physmem >> 4); | |
36b313da BB |
2329 | } |
2330 | ||
d1ff2312 BB |
2331 | /* |
2332 | * Called at module init when it is safe to use spl_kallsyms_lookup_name() | |
2333 | */ | |
2334 | int | |
2335 | spl_kmem_init_kallsyms_lookup(void) | |
2336 | { | |
2337 | #ifndef HAVE_GET_VMALLOC_INFO | |
2338 | get_vmalloc_info_fn = (get_vmalloc_info_t) | |
2339 | spl_kallsyms_lookup_name("get_vmalloc_info"); | |
e11d6c5f BB |
2340 | if (!get_vmalloc_info_fn) { |
2341 | printk(KERN_ERR "Error: Unknown symbol get_vmalloc_info\n"); | |
d1ff2312 | 2342 | return -EFAULT; |
e11d6c5f | 2343 | } |
d1ff2312 BB |
2344 | #endif /* HAVE_GET_VMALLOC_INFO */ |
2345 | ||
5232d256 BB |
2346 | #ifdef HAVE_PGDAT_HELPERS |
2347 | # ifndef HAVE_FIRST_ONLINE_PGDAT | |
d1ff2312 BB |
2348 | first_online_pgdat_fn = (first_online_pgdat_t) |
2349 | spl_kallsyms_lookup_name("first_online_pgdat"); | |
e11d6c5f BB |
2350 | if (!first_online_pgdat_fn) { |
2351 | printk(KERN_ERR "Error: Unknown symbol first_online_pgdat\n"); | |
d1ff2312 | 2352 | return -EFAULT; |
e11d6c5f | 2353 | } |
5232d256 | 2354 | # endif /* HAVE_FIRST_ONLINE_PGDAT */ |
d1ff2312 | 2355 | |
5232d256 | 2356 | # ifndef HAVE_NEXT_ONLINE_PGDAT |
d1ff2312 BB |
2357 | next_online_pgdat_fn = (next_online_pgdat_t) |
2358 | spl_kallsyms_lookup_name("next_online_pgdat"); | |
e11d6c5f BB |
2359 | if (!next_online_pgdat_fn) { |
2360 | printk(KERN_ERR "Error: Unknown symbol next_online_pgdat\n"); | |
d1ff2312 | 2361 | return -EFAULT; |
e11d6c5f | 2362 | } |
5232d256 | 2363 | # endif /* HAVE_NEXT_ONLINE_PGDAT */ |
d1ff2312 | 2364 | |
5232d256 | 2365 | # ifndef HAVE_NEXT_ZONE |
d1ff2312 BB |
2366 | next_zone_fn = (next_zone_t) |
2367 | spl_kallsyms_lookup_name("next_zone"); | |
e11d6c5f BB |
2368 | if (!next_zone_fn) { |
2369 | printk(KERN_ERR "Error: Unknown symbol next_zone\n"); | |
d1ff2312 | 2370 | return -EFAULT; |
e11d6c5f | 2371 | } |
5232d256 BB |
2372 | # endif /* HAVE_NEXT_ZONE */ |
2373 | ||
2374 | #else /* HAVE_PGDAT_HELPERS */ | |
2375 | ||
2376 | # ifndef HAVE_PGDAT_LIST | |
124ca8a5 | 2377 | pgdat_list_addr = *(struct pglist_data **) |
5232d256 BB |
2378 | spl_kallsyms_lookup_name("pgdat_list"); |
2379 | if (!pgdat_list_addr) { | |
2380 | printk(KERN_ERR "Error: Unknown symbol pgdat_list\n"); | |
2381 | return -EFAULT; | |
2382 | } | |
2383 | # endif /* HAVE_PGDAT_LIST */ | |
2384 | #endif /* HAVE_PGDAT_HELPERS */ | |
d1ff2312 | 2385 | |
6ae7fef5 | 2386 | #if defined(NEED_GET_ZONE_COUNTS) && !defined(HAVE_GET_ZONE_COUNTS) |
d1ff2312 BB |
2387 | get_zone_counts_fn = (get_zone_counts_t) |
2388 | spl_kallsyms_lookup_name("get_zone_counts"); | |
e11d6c5f BB |
2389 | if (!get_zone_counts_fn) { |
2390 | printk(KERN_ERR "Error: Unknown symbol get_zone_counts\n"); | |
d1ff2312 | 2391 | return -EFAULT; |
e11d6c5f | 2392 | } |
6ae7fef5 | 2393 | #endif /* NEED_GET_ZONE_COUNTS && !HAVE_GET_ZONE_COUNTS */ |
d1ff2312 BB |
2394 | |
2395 | /* | |
2396 | * It is now safe to initialize the global tunings which rely on | |
2397 | * the use of the for_each_zone() macro. This macro in turns | |
2398 | * depends on the *_pgdat symbols which are now available. | |
2399 | */ | |
2400 | spl_kmem_init_globals(); | |
2401 | ||
e76f4bf1 | 2402 | #ifndef HAVE_SHRINK_DCACHE_MEMORY |
fe71c0e5 | 2403 | /* When shrink_dcache_memory_fn == NULL support is disabled */ |
e76f4bf1 | 2404 | shrink_dcache_memory_fn = (shrink_dcache_memory_t) |
fe71c0e5 | 2405 | spl_kallsyms_lookup_name("shrink_dcache_memory"); |
e76f4bf1 BB |
2406 | #endif /* HAVE_SHRINK_DCACHE_MEMORY */ |
2407 | ||
2408 | #ifndef HAVE_SHRINK_ICACHE_MEMORY | |
fe71c0e5 | 2409 | /* When shrink_icache_memory_fn == NULL support is disabled */ |
e76f4bf1 | 2410 | shrink_icache_memory_fn = (shrink_icache_memory_t) |
fe71c0e5 | 2411 | spl_kallsyms_lookup_name("shrink_icache_memory"); |
e76f4bf1 BB |
2412 | #endif /* HAVE_SHRINK_ICACHE_MEMORY */ |
2413 | ||
d1ff2312 BB |
2414 | return 0; |
2415 | } | |
2416 | ||
a1502d76 BB |
2417 | int |
2418 | spl_kmem_init(void) | |
2419 | { | |
2420 | int rc = 0; | |
b17edc10 | 2421 | SENTRY; |
a1502d76 BB |
2422 | |
2423 | init_rwsem(&spl_kmem_cache_sem); | |
2424 | INIT_LIST_HEAD(&spl_kmem_cache_list); | |
a10287e0 BB |
2425 | spl_kmem_cache_taskq = taskq_create("spl_kmem_cache", |
2426 | 1, maxclsyspri, 1, 32, TASKQ_PREPOPULATE); | |
a1502d76 | 2427 | |
495bd532 | 2428 | spl_register_shrinker(&spl_kmem_cache_shrinker); |
a1502d76 BB |
2429 | |
2430 | #ifdef DEBUG_KMEM | |
d04c8a56 BB |
2431 | kmem_alloc_used_set(0); |
2432 | vmem_alloc_used_set(0); | |
a1502d76 BB |
2433 | |
2434 | spl_kmem_init_tracking(&kmem_list, &kmem_lock, KMEM_TABLE_SIZE); | |
2435 | spl_kmem_init_tracking(&vmem_list, &vmem_lock, VMEM_TABLE_SIZE); | |
2436 | #endif | |
b17edc10 | 2437 | SRETURN(rc); |
a1502d76 BB |
2438 | } |
2439 | ||
ff449ac4 BB |
2440 | void |
2441 | spl_kmem_fini(void) | |
2442 | { | |
2443 | #ifdef DEBUG_KMEM | |
2444 | /* Display all unreclaimed memory addresses, including the | |
2445 | * allocation size and the first few bytes of what's located | |
2446 | * at that address to aid in debugging. Performance is not | |
2447 | * a serious concern here since it is module unload time. */ | |
d04c8a56 | 2448 | if (kmem_alloc_used_read() != 0) |
b17edc10 | 2449 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, |
3cb77549 BB |
2450 | "kmem leaked %ld/%ld bytes\n", |
2451 | kmem_alloc_used_read(), kmem_alloc_max); | |
ff449ac4 | 2452 | |
2fb9b26a | 2453 | |
d04c8a56 | 2454 | if (vmem_alloc_used_read() != 0) |
b17edc10 | 2455 | SDEBUG_LIMIT(SD_CONSOLE | SD_WARNING, |
3cb77549 BB |
2456 | "vmem leaked %ld/%ld bytes\n", |
2457 | vmem_alloc_used_read(), vmem_alloc_max); | |
2fb9b26a | 2458 | |
ff449ac4 BB |
2459 | spl_kmem_fini_tracking(&kmem_list, &kmem_lock); |
2460 | spl_kmem_fini_tracking(&vmem_list, &vmem_lock); | |
2461 | #endif /* DEBUG_KMEM */ | |
b17edc10 | 2462 | SENTRY; |
2fb9b26a | 2463 | |
495bd532 | 2464 | spl_unregister_shrinker(&spl_kmem_cache_shrinker); |
a10287e0 | 2465 | taskq_destroy(spl_kmem_cache_taskq); |
2fb9b26a | 2466 | |
b17edc10 | 2467 | SEXIT; |
5d86345d | 2468 | } |