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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 | 6 | * UCRL-CODE-235197 |
7 | * | |
716154c5 BB |
8 | * This file is part of the SPL, Solaris Porting Layer. |
9 | * For details, see <http://github.com/behlendorf/spl/>. | |
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 | 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> |
f1ca4da6 | 28 | |
937879f1 | 29 | #ifdef DEBUG_SUBSYSTEM |
a0f6da3d | 30 | # undef DEBUG_SUBSYSTEM |
937879f1 | 31 | #endif |
32 | ||
33 | #define DEBUG_SUBSYSTEM S_KMEM | |
34 | ||
36b313da BB |
35 | /* |
36 | * The minimum amount of memory measured in pages to be free at all | |
37 | * times on the system. This is similar to Linux's zone->pages_min | |
38 | * multipled by the number of zones and is sized based on that. | |
39 | */ | |
40 | pgcnt_t minfree = 0; | |
41 | EXPORT_SYMBOL(minfree); | |
42 | ||
43 | /* | |
44 | * The desired amount of memory measured in pages to be free at all | |
45 | * times on the system. This is similar to Linux's zone->pages_low | |
46 | * multipled by the number of zones and is sized based on that. | |
47 | * Assuming all zones are being used roughly equally, when we drop | |
48 | * below this threshold async page reclamation is triggered. | |
49 | */ | |
50 | pgcnt_t desfree = 0; | |
51 | EXPORT_SYMBOL(desfree); | |
52 | ||
53 | /* | |
54 | * When above this amount of memory measures in pages the system is | |
55 | * determined to have enough free memory. This is similar to Linux's | |
56 | * zone->pages_high multipled by the number of zones and is sized based | |
57 | * on that. Assuming all zones are being used roughly equally, when | |
58 | * async page reclamation reaches this threshold it stops. | |
59 | */ | |
60 | pgcnt_t lotsfree = 0; | |
61 | EXPORT_SYMBOL(lotsfree); | |
62 | ||
63 | /* Unused always 0 in this implementation */ | |
64 | pgcnt_t needfree = 0; | |
65 | EXPORT_SYMBOL(needfree); | |
66 | ||
36b313da BB |
67 | pgcnt_t swapfs_minfree = 0; |
68 | EXPORT_SYMBOL(swapfs_minfree); | |
69 | ||
70 | pgcnt_t swapfs_reserve = 0; | |
71 | EXPORT_SYMBOL(swapfs_reserve); | |
72 | ||
36b313da BB |
73 | vmem_t *heap_arena = NULL; |
74 | EXPORT_SYMBOL(heap_arena); | |
75 | ||
76 | vmem_t *zio_alloc_arena = NULL; | |
77 | EXPORT_SYMBOL(zio_alloc_arena); | |
78 | ||
79 | vmem_t *zio_arena = NULL; | |
80 | EXPORT_SYMBOL(zio_arena); | |
81 | ||
d1ff2312 | 82 | #ifndef HAVE_GET_VMALLOC_INFO |
96dded38 | 83 | get_vmalloc_info_t get_vmalloc_info_fn = SYMBOL_POISON; |
d1ff2312 BB |
84 | EXPORT_SYMBOL(get_vmalloc_info_fn); |
85 | #endif /* HAVE_GET_VMALLOC_INFO */ | |
86 | ||
5232d256 BB |
87 | #ifdef HAVE_PGDAT_HELPERS |
88 | # ifndef HAVE_FIRST_ONLINE_PGDAT | |
96dded38 | 89 | first_online_pgdat_t first_online_pgdat_fn = SYMBOL_POISON; |
d1ff2312 | 90 | EXPORT_SYMBOL(first_online_pgdat_fn); |
5232d256 | 91 | # endif /* HAVE_FIRST_ONLINE_PGDAT */ |
36b313da | 92 | |
5232d256 | 93 | # ifndef HAVE_NEXT_ONLINE_PGDAT |
96dded38 | 94 | next_online_pgdat_t next_online_pgdat_fn = SYMBOL_POISON; |
d1ff2312 | 95 | EXPORT_SYMBOL(next_online_pgdat_fn); |
5232d256 | 96 | # endif /* HAVE_NEXT_ONLINE_PGDAT */ |
36b313da | 97 | |
5232d256 | 98 | # ifndef HAVE_NEXT_ZONE |
96dded38 | 99 | next_zone_t next_zone_fn = SYMBOL_POISON; |
d1ff2312 | 100 | EXPORT_SYMBOL(next_zone_fn); |
5232d256 BB |
101 | # endif /* HAVE_NEXT_ZONE */ |
102 | ||
103 | #else /* HAVE_PGDAT_HELPERS */ | |
104 | ||
105 | # ifndef HAVE_PGDAT_LIST | |
106 | struct pglist_data *pgdat_list_addr = SYMBOL_POISON; | |
107 | EXPORT_SYMBOL(pgdat_list_addr); | |
108 | # endif /* HAVE_PGDAT_LIST */ | |
109 | ||
110 | #endif /* HAVE_PGDAT_HELPERS */ | |
36b313da | 111 | |
6ae7fef5 | 112 | #ifdef NEED_GET_ZONE_COUNTS |
e11d6c5f | 113 | # ifndef HAVE_GET_ZONE_COUNTS |
96dded38 | 114 | get_zone_counts_t get_zone_counts_fn = SYMBOL_POISON; |
d1ff2312 | 115 | EXPORT_SYMBOL(get_zone_counts_fn); |
96dded38 | 116 | # endif /* HAVE_GET_ZONE_COUNTS */ |
4ab13d3b | 117 | |
e11d6c5f | 118 | unsigned long |
6ae7fef5 | 119 | spl_global_page_state(spl_zone_stat_item_t item) |
4ab13d3b BB |
120 | { |
121 | unsigned long active; | |
122 | unsigned long inactive; | |
123 | unsigned long free; | |
124 | ||
6ae7fef5 BB |
125 | get_zone_counts(&active, &inactive, &free); |
126 | switch (item) { | |
127 | case SPL_NR_FREE_PAGES: return free; | |
128 | case SPL_NR_INACTIVE: return inactive; | |
129 | case SPL_NR_ACTIVE: return active; | |
130 | default: ASSERT(0); /* Unsupported */ | |
e11d6c5f BB |
131 | } |
132 | ||
6ae7fef5 BB |
133 | return 0; |
134 | } | |
135 | #else | |
136 | # ifdef HAVE_GLOBAL_PAGE_STATE | |
137 | unsigned long | |
138 | spl_global_page_state(spl_zone_stat_item_t item) | |
139 | { | |
140 | unsigned long pages = 0; | |
141 | ||
142 | switch (item) { | |
143 | case SPL_NR_FREE_PAGES: | |
144 | # ifdef HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES | |
145 | pages += global_page_state(NR_FREE_PAGES); | |
146 | # endif | |
147 | break; | |
148 | case SPL_NR_INACTIVE: | |
149 | # ifdef HAVE_ZONE_STAT_ITEM_NR_INACTIVE | |
150 | pages += global_page_state(NR_INACTIVE); | |
151 | # endif | |
152 | # ifdef HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON | |
153 | pages += global_page_state(NR_INACTIVE_ANON); | |
154 | # endif | |
155 | # ifdef HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE | |
156 | pages += global_page_state(NR_INACTIVE_FILE); | |
157 | # endif | |
158 | break; | |
159 | case SPL_NR_ACTIVE: | |
160 | # ifdef HAVE_ZONE_STAT_ITEM_NR_ACTIVE | |
161 | pages += global_page_state(NR_ACTIVE); | |
162 | # endif | |
163 | # ifdef HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON | |
164 | pages += global_page_state(NR_ACTIVE_ANON); | |
165 | # endif | |
166 | # ifdef HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE | |
167 | pages += global_page_state(NR_ACTIVE_FILE); | |
168 | # endif | |
169 | break; | |
170 | default: | |
171 | ASSERT(0); /* Unsupported */ | |
e11d6c5f BB |
172 | } |
173 | ||
6ae7fef5 BB |
174 | return pages; |
175 | } | |
96dded38 | 176 | # else |
6ae7fef5 | 177 | # error "Both global_page_state() and get_zone_counts() unavailable" |
96dded38 | 178 | # endif /* HAVE_GLOBAL_PAGE_STATE */ |
6ae7fef5 | 179 | #endif /* NEED_GET_ZONE_COUNTS */ |
e11d6c5f | 180 | EXPORT_SYMBOL(spl_global_page_state); |
4ab13d3b | 181 | |
e11d6c5f BB |
182 | pgcnt_t |
183 | spl_kmem_availrmem(void) | |
184 | { | |
4ab13d3b | 185 | /* The amount of easily available memory */ |
6ae7fef5 BB |
186 | return (spl_global_page_state(SPL_NR_FREE_PAGES) + |
187 | spl_global_page_state(SPL_NR_INACTIVE)); | |
4ab13d3b BB |
188 | } |
189 | EXPORT_SYMBOL(spl_kmem_availrmem); | |
190 | ||
191 | size_t | |
192 | vmem_size(vmem_t *vmp, int typemask) | |
193 | { | |
d1ff2312 BB |
194 | struct vmalloc_info vmi; |
195 | size_t size = 0; | |
196 | ||
4ab13d3b BB |
197 | ASSERT(vmp == NULL); |
198 | ASSERT(typemask & (VMEM_ALLOC | VMEM_FREE)); | |
199 | ||
d1ff2312 BB |
200 | get_vmalloc_info(&vmi); |
201 | if (typemask & VMEM_ALLOC) | |
202 | size += (size_t)vmi.used; | |
203 | ||
204 | if (typemask & VMEM_FREE) | |
205 | size += (size_t)(VMALLOC_TOTAL - vmi.used); | |
206 | ||
207 | return size; | |
4ab13d3b BB |
208 | } |
209 | EXPORT_SYMBOL(vmem_size); | |
4ab13d3b | 210 | |
f1ca4da6 | 211 | /* |
2fb9b26a | 212 | * Memory allocation interfaces and debugging for basic kmem_* |
055ffd98 BB |
213 | * and vmem_* style memory allocation. When DEBUG_KMEM is enabled |
214 | * the SPL will keep track of the total memory allocated, and | |
215 | * report any memory leaked when the module is unloaded. | |
f1ca4da6 | 216 | */ |
217 | #ifdef DEBUG_KMEM | |
d04c8a56 | 218 | |
f1ca4da6 | 219 | /* Shim layer memory accounting */ |
d04c8a56 | 220 | # ifdef HAVE_ATOMIC64_T |
550f1705 | 221 | atomic64_t kmem_alloc_used = ATOMIC64_INIT(0); |
a0f6da3d | 222 | unsigned long long kmem_alloc_max = 0; |
550f1705 | 223 | atomic64_t vmem_alloc_used = ATOMIC64_INIT(0); |
a0f6da3d | 224 | unsigned long long vmem_alloc_max = 0; |
d04c8a56 BB |
225 | # else |
226 | atomic_t kmem_alloc_used = ATOMIC_INIT(0); | |
227 | unsigned long long kmem_alloc_max = 0; | |
228 | atomic_t vmem_alloc_used = ATOMIC_INIT(0); | |
229 | unsigned long long vmem_alloc_max = 0; | |
230 | # endif /* _LP64 */ | |
c19c06f3 | 231 | int kmem_warning_flag = 1; |
79b31f36 | 232 | |
ff449ac4 | 233 | EXPORT_SYMBOL(kmem_alloc_used); |
234 | EXPORT_SYMBOL(kmem_alloc_max); | |
235 | EXPORT_SYMBOL(vmem_alloc_used); | |
236 | EXPORT_SYMBOL(vmem_alloc_max); | |
237 | EXPORT_SYMBOL(kmem_warning_flag); | |
238 | ||
055ffd98 BB |
239 | /* When DEBUG_KMEM_TRACKING is enabled not only will total bytes be tracked |
240 | * but also the location of every alloc and free. When the SPL module is | |
241 | * unloaded a list of all leaked addresses and where they were allocated | |
242 | * will be dumped to the console. Enabling this feature has a significant | |
243 | * impact on performance but it makes finding memory leaks straight forward. | |
244 | * | |
245 | * Not surprisingly with debugging enabled the xmem_locks are very highly | |
246 | * contended particularly on xfree(). If we want to run with this detailed | |
247 | * debugging enabled for anything other than debugging we need to minimize | |
248 | * the contention by moving to a lock per xmem_table entry model. | |
a0f6da3d | 249 | */ |
055ffd98 | 250 | # ifdef DEBUG_KMEM_TRACKING |
a0f6da3d | 251 | |
252 | # define KMEM_HASH_BITS 10 | |
253 | # define KMEM_TABLE_SIZE (1 << KMEM_HASH_BITS) | |
254 | ||
255 | # define VMEM_HASH_BITS 10 | |
256 | # define VMEM_TABLE_SIZE (1 << VMEM_HASH_BITS) | |
257 | ||
258 | typedef struct kmem_debug { | |
259 | struct hlist_node kd_hlist; /* Hash node linkage */ | |
260 | struct list_head kd_list; /* List of all allocations */ | |
261 | void *kd_addr; /* Allocation pointer */ | |
262 | size_t kd_size; /* Allocation size */ | |
263 | const char *kd_func; /* Allocation function */ | |
264 | int kd_line; /* Allocation line */ | |
265 | } kmem_debug_t; | |
266 | ||
d6a26c6a | 267 | spinlock_t kmem_lock; |
268 | struct hlist_head kmem_table[KMEM_TABLE_SIZE]; | |
269 | struct list_head kmem_list; | |
270 | ||
13cdca65 | 271 | spinlock_t vmem_lock; |
272 | struct hlist_head vmem_table[VMEM_TABLE_SIZE]; | |
273 | struct list_head vmem_list; | |
274 | ||
d6a26c6a | 275 | EXPORT_SYMBOL(kmem_lock); |
276 | EXPORT_SYMBOL(kmem_table); | |
277 | EXPORT_SYMBOL(kmem_list); | |
278 | ||
13cdca65 | 279 | EXPORT_SYMBOL(vmem_lock); |
280 | EXPORT_SYMBOL(vmem_table); | |
281 | EXPORT_SYMBOL(vmem_list); | |
a0f6da3d | 282 | # endif |
13cdca65 | 283 | |
c19c06f3 | 284 | int kmem_set_warning(int flag) { return (kmem_warning_flag = !!flag); } |
285 | #else | |
286 | int kmem_set_warning(int flag) { return 0; } | |
f1ca4da6 | 287 | #endif |
c19c06f3 | 288 | EXPORT_SYMBOL(kmem_set_warning); |
f1ca4da6 | 289 | |
290 | /* | |
291 | * Slab allocation interfaces | |
292 | * | |
2fb9b26a | 293 | * While the Linux slab implementation was inspired by the Solaris |
294 | * implemenation I cannot use it to emulate the Solaris APIs. I | |
295 | * require two features which are not provided by the Linux slab. | |
296 | * | |
297 | * 1) Constructors AND destructors. Recent versions of the Linux | |
298 | * kernel have removed support for destructors. This is a deal | |
299 | * breaker for the SPL which contains particularly expensive | |
300 | * initializers for mutex's, condition variables, etc. We also | |
a0f6da3d | 301 | * require a minimal level of cleanup for these data types unlike |
302 | * many Linux data type which do need to be explicitly destroyed. | |
2fb9b26a | 303 | * |
a0f6da3d | 304 | * 2) Virtual address space backed slab. Callers of the Solaris slab |
2fb9b26a | 305 | * expect it to work well for both small are very large allocations. |
306 | * Because of memory fragmentation the Linux slab which is backed | |
307 | * by kmalloc'ed memory performs very badly when confronted with | |
308 | * large numbers of large allocations. Basing the slab on the | |
309 | * virtual address space removes the need for contigeous pages | |
310 | * and greatly improve performance for large allocations. | |
311 | * | |
312 | * For these reasons, the SPL has its own slab implementation with | |
313 | * the needed features. It is not as highly optimized as either the | |
314 | * Solaris or Linux slabs, but it should get me most of what is | |
315 | * needed until it can be optimized or obsoleted by another approach. | |
316 | * | |
317 | * One serious concern I do have about this method is the relatively | |
318 | * small virtual address space on 32bit arches. This will seriously | |
319 | * constrain the size of the slab caches and their performance. | |
320 | * | |
2fb9b26a | 321 | * XXX: Improve the partial slab list by carefully maintaining a |
322 | * strict ordering of fullest to emptiest slabs based on | |
323 | * the slab reference count. This gaurentees the when freeing | |
324 | * slabs back to the system we need only linearly traverse the | |
325 | * last N slabs in the list to discover all the freeable slabs. | |
326 | * | |
327 | * XXX: NUMA awareness for optionally allocating memory close to a | |
328 | * particular core. This can be adventageous if you know the slab | |
329 | * object will be short lived and primarily accessed from one core. | |
330 | * | |
331 | * XXX: Slab coloring may also yield performance improvements and would | |
332 | * be desirable to implement. | |
f1ca4da6 | 333 | */ |
2fb9b26a | 334 | |
a0f6da3d | 335 | struct list_head spl_kmem_cache_list; /* List of caches */ |
336 | struct rw_semaphore spl_kmem_cache_sem; /* Cache list lock */ | |
c30df9c8 | 337 | |
4afaaefa | 338 | static int spl_cache_flush(spl_kmem_cache_t *skc, |
a0f6da3d | 339 | spl_kmem_magazine_t *skm, int flush); |
4afaaefa | 340 | |
57d86234 | 341 | #ifdef HAVE_SET_SHRINKER |
2fb9b26a | 342 | static struct shrinker *spl_kmem_cache_shrinker; |
57d86234 | 343 | #else |
4afaaefa | 344 | static int spl_kmem_cache_generic_shrinker(int nr_to_scan, |
a0f6da3d | 345 | unsigned int gfp_mask); |
2fb9b26a | 346 | static struct shrinker spl_kmem_cache_shrinker = { |
4afaaefa | 347 | .shrink = spl_kmem_cache_generic_shrinker, |
57d86234 | 348 | .seeks = KMC_DEFAULT_SEEKS, |
349 | }; | |
350 | #endif | |
f1ca4da6 | 351 | |
a0f6da3d | 352 | #ifdef DEBUG_KMEM |
353 | # ifdef DEBUG_KMEM_TRACKING | |
354 | ||
355 | static kmem_debug_t * | |
356 | kmem_del_init(spinlock_t *lock, struct hlist_head *table, int bits, | |
357 | void *addr) | |
358 | { | |
359 | struct hlist_head *head; | |
360 | struct hlist_node *node; | |
361 | struct kmem_debug *p; | |
362 | unsigned long flags; | |
363 | ENTRY; | |
364 | ||
365 | spin_lock_irqsave(lock, flags); | |
366 | ||
367 | head = &table[hash_ptr(addr, bits)]; | |
368 | hlist_for_each_entry_rcu(p, node, head, kd_hlist) { | |
369 | if (p->kd_addr == addr) { | |
370 | hlist_del_init(&p->kd_hlist); | |
371 | list_del_init(&p->kd_list); | |
372 | spin_unlock_irqrestore(lock, flags); | |
373 | return p; | |
374 | } | |
375 | } | |
376 | ||
377 | spin_unlock_irqrestore(lock, flags); | |
378 | ||
379 | RETURN(NULL); | |
380 | } | |
381 | ||
382 | void * | |
383 | kmem_alloc_track(size_t size, int flags, const char *func, int line, | |
384 | int node_alloc, int node) | |
385 | { | |
386 | void *ptr = NULL; | |
387 | kmem_debug_t *dptr; | |
388 | unsigned long irq_flags; | |
389 | ENTRY; | |
390 | ||
c89fdee4 | 391 | dptr = (kmem_debug_t *) kmalloc_nofail(sizeof(kmem_debug_t), |
a0f6da3d | 392 | flags & ~__GFP_ZERO); |
393 | ||
394 | if (dptr == NULL) { | |
395 | CWARN("kmem_alloc(%ld, 0x%x) debug failed\n", | |
396 | sizeof(kmem_debug_t), flags); | |
397 | } else { | |
398 | /* Marked unlikely because we should never be doing this, | |
399 | * we tolerate to up 2 pages but a single page is best. */ | |
400 | if (unlikely((size) > (PAGE_SIZE * 2)) && kmem_warning_flag) | |
401 | CWARN("Large kmem_alloc(%llu, 0x%x) (%lld/%llu)\n", | |
402 | (unsigned long long) size, flags, | |
d04c8a56 | 403 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d | 404 | |
c8e60837 | 405 | /* We use kstrdup() below because the string pointed to by |
406 | * __FUNCTION__ might not be available by the time we want | |
407 | * to print it since the module might have been unloaded. */ | |
408 | dptr->kd_func = kstrdup(func, flags & ~__GFP_ZERO); | |
409 | if (unlikely(dptr->kd_func == NULL)) { | |
410 | kfree(dptr); | |
411 | CWARN("kstrdup() failed in kmem_alloc(%llu, 0x%x) " | |
412 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
d04c8a56 | 413 | kmem_alloc_used_read(), kmem_alloc_max); |
c8e60837 | 414 | goto out; |
415 | } | |
416 | ||
a0f6da3d | 417 | /* Use the correct allocator */ |
418 | if (node_alloc) { | |
419 | ASSERT(!(flags & __GFP_ZERO)); | |
c89fdee4 | 420 | ptr = kmalloc_node_nofail(size, flags, node); |
a0f6da3d | 421 | } else if (flags & __GFP_ZERO) { |
c89fdee4 | 422 | ptr = kzalloc_nofail(size, flags & ~__GFP_ZERO); |
a0f6da3d | 423 | } else { |
c89fdee4 | 424 | ptr = kmalloc_nofail(size, flags); |
a0f6da3d | 425 | } |
426 | ||
427 | if (unlikely(ptr == NULL)) { | |
c8e60837 | 428 | kfree(dptr->kd_func); |
a0f6da3d | 429 | kfree(dptr); |
430 | CWARN("kmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
431 | (unsigned long long) size, flags, | |
d04c8a56 | 432 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d | 433 | goto out; |
434 | } | |
435 | ||
d04c8a56 BB |
436 | kmem_alloc_used_add(size); |
437 | if (unlikely(kmem_alloc_used_read() > kmem_alloc_max)) | |
438 | kmem_alloc_max = kmem_alloc_used_read(); | |
a0f6da3d | 439 | |
440 | INIT_HLIST_NODE(&dptr->kd_hlist); | |
441 | INIT_LIST_HEAD(&dptr->kd_list); | |
442 | ||
443 | dptr->kd_addr = ptr; | |
444 | dptr->kd_size = size; | |
a0f6da3d | 445 | dptr->kd_line = line; |
446 | ||
447 | spin_lock_irqsave(&kmem_lock, irq_flags); | |
448 | hlist_add_head_rcu(&dptr->kd_hlist, | |
449 | &kmem_table[hash_ptr(ptr, KMEM_HASH_BITS)]); | |
450 | list_add_tail(&dptr->kd_list, &kmem_list); | |
451 | spin_unlock_irqrestore(&kmem_lock, irq_flags); | |
452 | ||
453 | CDEBUG_LIMIT(D_INFO, "kmem_alloc(%llu, 0x%x) = %p " | |
454 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
d04c8a56 | 455 | ptr, kmem_alloc_used_read(), |
a0f6da3d | 456 | kmem_alloc_max); |
457 | } | |
458 | out: | |
459 | RETURN(ptr); | |
460 | } | |
461 | EXPORT_SYMBOL(kmem_alloc_track); | |
462 | ||
463 | void | |
464 | kmem_free_track(void *ptr, size_t size) | |
465 | { | |
466 | kmem_debug_t *dptr; | |
467 | ENTRY; | |
468 | ||
469 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
470 | (unsigned long long) size); | |
471 | ||
472 | dptr = kmem_del_init(&kmem_lock, kmem_table, KMEM_HASH_BITS, ptr); | |
473 | ||
474 | ASSERT(dptr); /* Must exist in hash due to kmem_alloc() */ | |
475 | ||
476 | /* Size must match */ | |
477 | ASSERTF(dptr->kd_size == size, "kd_size (%llu) != size (%llu), " | |
478 | "kd_func = %s, kd_line = %d\n", (unsigned long long) dptr->kd_size, | |
479 | (unsigned long long) size, dptr->kd_func, dptr->kd_line); | |
480 | ||
d04c8a56 | 481 | kmem_alloc_used_sub(size); |
a0f6da3d | 482 | CDEBUG_LIMIT(D_INFO, "kmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 483 | (unsigned long long) size, kmem_alloc_used_read(), |
a0f6da3d | 484 | kmem_alloc_max); |
485 | ||
c8e60837 | 486 | kfree(dptr->kd_func); |
487 | ||
a0f6da3d | 488 | memset(dptr, 0x5a, sizeof(kmem_debug_t)); |
489 | kfree(dptr); | |
490 | ||
491 | memset(ptr, 0x5a, size); | |
492 | kfree(ptr); | |
493 | ||
494 | EXIT; | |
495 | } | |
496 | EXPORT_SYMBOL(kmem_free_track); | |
497 | ||
498 | void * | |
499 | vmem_alloc_track(size_t size, int flags, const char *func, int line) | |
500 | { | |
501 | void *ptr = NULL; | |
502 | kmem_debug_t *dptr; | |
503 | unsigned long irq_flags; | |
504 | ENTRY; | |
505 | ||
506 | ASSERT(flags & KM_SLEEP); | |
507 | ||
ef1c7a06 BB |
508 | dptr = (kmem_debug_t *) kmalloc_nofail(sizeof(kmem_debug_t), |
509 | flags & ~__GFP_ZERO); | |
a0f6da3d | 510 | if (dptr == NULL) { |
511 | CWARN("vmem_alloc(%ld, 0x%x) debug failed\n", | |
512 | sizeof(kmem_debug_t), flags); | |
513 | } else { | |
c8e60837 | 514 | /* We use kstrdup() below because the string pointed to by |
515 | * __FUNCTION__ might not be available by the time we want | |
516 | * to print it, since the module might have been unloaded. */ | |
517 | dptr->kd_func = kstrdup(func, flags & ~__GFP_ZERO); | |
518 | if (unlikely(dptr->kd_func == NULL)) { | |
519 | kfree(dptr); | |
520 | CWARN("kstrdup() failed in vmem_alloc(%llu, 0x%x) " | |
521 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
d04c8a56 | 522 | vmem_alloc_used_read(), vmem_alloc_max); |
c8e60837 | 523 | goto out; |
524 | } | |
525 | ||
a0f6da3d | 526 | ptr = __vmalloc(size, (flags | __GFP_HIGHMEM) & ~__GFP_ZERO, |
527 | PAGE_KERNEL); | |
528 | ||
529 | if (unlikely(ptr == NULL)) { | |
c8e60837 | 530 | kfree(dptr->kd_func); |
a0f6da3d | 531 | kfree(dptr); |
532 | CWARN("vmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
533 | (unsigned long long) size, flags, | |
d04c8a56 | 534 | vmem_alloc_used_read(), vmem_alloc_max); |
a0f6da3d | 535 | goto out; |
536 | } | |
537 | ||
538 | if (flags & __GFP_ZERO) | |
539 | memset(ptr, 0, size); | |
540 | ||
d04c8a56 BB |
541 | vmem_alloc_used_add(size); |
542 | if (unlikely(vmem_alloc_used_read() > vmem_alloc_max)) | |
543 | vmem_alloc_max = vmem_alloc_used_read(); | |
a0f6da3d | 544 | |
545 | INIT_HLIST_NODE(&dptr->kd_hlist); | |
546 | INIT_LIST_HEAD(&dptr->kd_list); | |
547 | ||
548 | dptr->kd_addr = ptr; | |
549 | dptr->kd_size = size; | |
a0f6da3d | 550 | dptr->kd_line = line; |
551 | ||
552 | spin_lock_irqsave(&vmem_lock, irq_flags); | |
553 | hlist_add_head_rcu(&dptr->kd_hlist, | |
554 | &vmem_table[hash_ptr(ptr, VMEM_HASH_BITS)]); | |
555 | list_add_tail(&dptr->kd_list, &vmem_list); | |
556 | spin_unlock_irqrestore(&vmem_lock, irq_flags); | |
557 | ||
558 | CDEBUG_LIMIT(D_INFO, "vmem_alloc(%llu, 0x%x) = %p " | |
559 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
d04c8a56 | 560 | ptr, vmem_alloc_used_read(), |
a0f6da3d | 561 | vmem_alloc_max); |
562 | } | |
563 | out: | |
564 | RETURN(ptr); | |
565 | } | |
566 | EXPORT_SYMBOL(vmem_alloc_track); | |
567 | ||
568 | void | |
569 | vmem_free_track(void *ptr, size_t size) | |
570 | { | |
571 | kmem_debug_t *dptr; | |
572 | ENTRY; | |
573 | ||
574 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
575 | (unsigned long long) size); | |
576 | ||
577 | dptr = kmem_del_init(&vmem_lock, vmem_table, VMEM_HASH_BITS, ptr); | |
578 | ASSERT(dptr); /* Must exist in hash due to vmem_alloc() */ | |
579 | ||
580 | /* Size must match */ | |
581 | ASSERTF(dptr->kd_size == size, "kd_size (%llu) != size (%llu), " | |
582 | "kd_func = %s, kd_line = %d\n", (unsigned long long) dptr->kd_size, | |
583 | (unsigned long long) size, dptr->kd_func, dptr->kd_line); | |
584 | ||
d04c8a56 | 585 | vmem_alloc_used_sub(size); |
a0f6da3d | 586 | CDEBUG_LIMIT(D_INFO, "vmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 587 | (unsigned long long) size, vmem_alloc_used_read(), |
a0f6da3d | 588 | vmem_alloc_max); |
589 | ||
c8e60837 | 590 | kfree(dptr->kd_func); |
591 | ||
a0f6da3d | 592 | memset(dptr, 0x5a, sizeof(kmem_debug_t)); |
593 | kfree(dptr); | |
594 | ||
595 | memset(ptr, 0x5a, size); | |
596 | vfree(ptr); | |
597 | ||
598 | EXIT; | |
599 | } | |
600 | EXPORT_SYMBOL(vmem_free_track); | |
601 | ||
602 | # else /* DEBUG_KMEM_TRACKING */ | |
603 | ||
604 | void * | |
605 | kmem_alloc_debug(size_t size, int flags, const char *func, int line, | |
606 | int node_alloc, int node) | |
607 | { | |
608 | void *ptr; | |
609 | ENTRY; | |
610 | ||
611 | /* Marked unlikely because we should never be doing this, | |
612 | * we tolerate to up 2 pages but a single page is best. */ | |
613 | if (unlikely(size > (PAGE_SIZE * 2)) && kmem_warning_flag) | |
614 | CWARN("Large kmem_alloc(%llu, 0x%x) (%lld/%llu)\n", | |
615 | (unsigned long long) size, flags, | |
d04c8a56 | 616 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d | 617 | |
618 | /* Use the correct allocator */ | |
619 | if (node_alloc) { | |
620 | ASSERT(!(flags & __GFP_ZERO)); | |
c89fdee4 | 621 | ptr = kmalloc_node_nofail(size, flags, node); |
a0f6da3d | 622 | } else if (flags & __GFP_ZERO) { |
c89fdee4 | 623 | ptr = kzalloc_nofail(size, flags & (~__GFP_ZERO)); |
a0f6da3d | 624 | } else { |
c89fdee4 | 625 | ptr = kmalloc_nofail(size, flags); |
a0f6da3d | 626 | } |
627 | ||
628 | if (ptr == NULL) { | |
629 | CWARN("kmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
630 | (unsigned long long) size, flags, | |
d04c8a56 | 631 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d | 632 | } else { |
d04c8a56 BB |
633 | kmem_alloc_used_add(size); |
634 | if (unlikely(kmem_alloc_used_read() > kmem_alloc_max)) | |
635 | kmem_alloc_max = kmem_alloc_used_read(); | |
a0f6da3d | 636 | |
637 | CDEBUG_LIMIT(D_INFO, "kmem_alloc(%llu, 0x%x) = %p " | |
638 | "(%lld/%llu)\n", (unsigned long long) size, flags, ptr, | |
d04c8a56 | 639 | kmem_alloc_used_read(), kmem_alloc_max); |
a0f6da3d | 640 | } |
641 | RETURN(ptr); | |
642 | } | |
643 | EXPORT_SYMBOL(kmem_alloc_debug); | |
644 | ||
645 | void | |
646 | kmem_free_debug(void *ptr, size_t size) | |
647 | { | |
648 | ENTRY; | |
649 | ||
650 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
651 | (unsigned long long) size); | |
652 | ||
d04c8a56 | 653 | kmem_alloc_used_sub(size); |
a0f6da3d | 654 | CDEBUG_LIMIT(D_INFO, "kmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 655 | (unsigned long long) size, kmem_alloc_used_read(), |
a0f6da3d | 656 | kmem_alloc_max); |
657 | ||
658 | memset(ptr, 0x5a, size); | |
659 | kfree(ptr); | |
660 | ||
661 | EXIT; | |
662 | } | |
663 | EXPORT_SYMBOL(kmem_free_debug); | |
664 | ||
665 | void * | |
666 | vmem_alloc_debug(size_t size, int flags, const char *func, int line) | |
667 | { | |
668 | void *ptr; | |
669 | ENTRY; | |
670 | ||
671 | ASSERT(flags & KM_SLEEP); | |
672 | ||
673 | ptr = __vmalloc(size, (flags | __GFP_HIGHMEM) & ~__GFP_ZERO, | |
674 | PAGE_KERNEL); | |
675 | if (ptr == NULL) { | |
676 | CWARN("vmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
677 | (unsigned long long) size, flags, | |
d04c8a56 | 678 | vmem_alloc_used_read(), vmem_alloc_max); |
a0f6da3d | 679 | } else { |
680 | if (flags & __GFP_ZERO) | |
681 | memset(ptr, 0, size); | |
682 | ||
d04c8a56 BB |
683 | vmem_alloc_used_add(size); |
684 | if (unlikely(vmem_alloc_used_read() > vmem_alloc_max)) | |
685 | vmem_alloc_max = vmem_alloc_used_read(); | |
a0f6da3d | 686 | |
687 | CDEBUG_LIMIT(D_INFO, "vmem_alloc(%llu, 0x%x) = %p " | |
688 | "(%lld/%llu)\n", (unsigned long long) size, flags, ptr, | |
d04c8a56 | 689 | vmem_alloc_used_read(), vmem_alloc_max); |
a0f6da3d | 690 | } |
691 | ||
692 | RETURN(ptr); | |
693 | } | |
694 | EXPORT_SYMBOL(vmem_alloc_debug); | |
695 | ||
696 | void | |
697 | vmem_free_debug(void *ptr, size_t size) | |
698 | { | |
699 | ENTRY; | |
700 | ||
701 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
702 | (unsigned long long) size); | |
703 | ||
d04c8a56 | 704 | vmem_alloc_used_sub(size); |
a0f6da3d | 705 | CDEBUG_LIMIT(D_INFO, "vmem_free(%p, %llu) (%lld/%llu)\n", ptr, |
d04c8a56 | 706 | (unsigned long long) size, vmem_alloc_used_read(), |
a0f6da3d | 707 | vmem_alloc_max); |
708 | ||
709 | memset(ptr, 0x5a, size); | |
710 | vfree(ptr); | |
711 | ||
712 | EXIT; | |
713 | } | |
714 | EXPORT_SYMBOL(vmem_free_debug); | |
715 | ||
716 | # endif /* DEBUG_KMEM_TRACKING */ | |
717 | #endif /* DEBUG_KMEM */ | |
718 | ||
a1502d76 | 719 | static void * |
720 | kv_alloc(spl_kmem_cache_t *skc, int size, int flags) | |
fece7c99 | 721 | { |
a1502d76 | 722 | void *ptr; |
f1ca4da6 | 723 | |
8b45dda2 BB |
724 | ASSERT(ISP2(size)); |
725 | ||
726 | if (skc->skc_flags & KMC_KMEM) | |
727 | ptr = (void *)__get_free_pages(flags, get_order(size)); | |
728 | else | |
729 | ptr = __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL); | |
730 | ||
731 | /* Resulting allocated memory will be page aligned */ | |
732 | ASSERT(IS_P2ALIGNED(ptr, PAGE_SIZE)); | |
fece7c99 | 733 | |
a1502d76 | 734 | return ptr; |
735 | } | |
fece7c99 | 736 | |
a1502d76 | 737 | static void |
738 | kv_free(spl_kmem_cache_t *skc, void *ptr, int size) | |
739 | { | |
8b45dda2 BB |
740 | ASSERT(IS_P2ALIGNED(ptr, PAGE_SIZE)); |
741 | ASSERT(ISP2(size)); | |
742 | ||
743 | if (skc->skc_flags & KMC_KMEM) | |
744 | free_pages((unsigned long)ptr, get_order(size)); | |
745 | else | |
746 | vfree(ptr); | |
747 | } | |
748 | ||
749 | /* | |
750 | * Required space for each aligned sks. | |
751 | */ | |
752 | static inline uint32_t | |
753 | spl_sks_size(spl_kmem_cache_t *skc) | |
754 | { | |
755 | return P2ROUNDUP_TYPED(sizeof(spl_kmem_slab_t), | |
756 | skc->skc_obj_align, uint32_t); | |
757 | } | |
758 | ||
759 | /* | |
760 | * Required space for each aligned object. | |
761 | */ | |
762 | static inline uint32_t | |
763 | spl_obj_size(spl_kmem_cache_t *skc) | |
764 | { | |
765 | uint32_t align = skc->skc_obj_align; | |
766 | ||
767 | return P2ROUNDUP_TYPED(skc->skc_obj_size, align, uint32_t) + | |
768 | P2ROUNDUP_TYPED(sizeof(spl_kmem_obj_t), align, uint32_t); | |
769 | } | |
770 | ||
771 | /* | |
772 | * Lookup the spl_kmem_object_t for an object given that object. | |
773 | */ | |
774 | static inline spl_kmem_obj_t * | |
775 | spl_sko_from_obj(spl_kmem_cache_t *skc, void *obj) | |
776 | { | |
777 | return obj + P2ROUNDUP_TYPED(skc->skc_obj_size, | |
778 | skc->skc_obj_align, uint32_t); | |
779 | } | |
780 | ||
781 | /* | |
782 | * Required space for each offslab object taking in to account alignment | |
783 | * restrictions and the power-of-two requirement of kv_alloc(). | |
784 | */ | |
785 | static inline uint32_t | |
786 | spl_offslab_size(spl_kmem_cache_t *skc) | |
787 | { | |
788 | return 1UL << (highbit(spl_obj_size(skc)) + 1); | |
fece7c99 | 789 | } |
790 | ||
ea3e6ca9 BB |
791 | /* |
792 | * It's important that we pack the spl_kmem_obj_t structure and the | |
48e0606a BB |
793 | * actual objects in to one large address space to minimize the number |
794 | * of calls to the allocator. It is far better to do a few large | |
795 | * allocations and then subdivide it ourselves. Now which allocator | |
796 | * we use requires balancing a few trade offs. | |
797 | * | |
798 | * For small objects we use kmem_alloc() because as long as you are | |
799 | * only requesting a small number of pages (ideally just one) its cheap. | |
800 | * However, when you start requesting multiple pages with kmem_alloc() | |
801 | * it gets increasingly expensive since it requires contigeous pages. | |
802 | * For this reason we shift to vmem_alloc() for slabs of large objects | |
803 | * which removes the need for contigeous pages. We do not use | |
804 | * vmem_alloc() in all cases because there is significant locking | |
805 | * overhead in __get_vm_area_node(). This function takes a single | |
806 | * global lock when aquiring an available virtual address range which | |
807 | * serializes all vmem_alloc()'s for all slab caches. Using slightly | |
808 | * different allocation functions for small and large objects should | |
809 | * give us the best of both worlds. | |
810 | * | |
811 | * KMC_ONSLAB KMC_OFFSLAB | |
812 | * | |
813 | * +------------------------+ +-----------------+ | |
814 | * | spl_kmem_slab_t --+-+ | | spl_kmem_slab_t |---+-+ | |
815 | * | skc_obj_size <-+ | | +-----------------+ | | | |
816 | * | spl_kmem_obj_t | | | | | |
817 | * | skc_obj_size <---+ | +-----------------+ | | | |
818 | * | spl_kmem_obj_t | | | skc_obj_size | <-+ | | |
819 | * | ... v | | spl_kmem_obj_t | | | |
820 | * +------------------------+ +-----------------+ v | |
821 | */ | |
fece7c99 | 822 | static spl_kmem_slab_t * |
a1502d76 | 823 | spl_slab_alloc(spl_kmem_cache_t *skc, int flags) |
fece7c99 | 824 | { |
825 | spl_kmem_slab_t *sks; | |
a1502d76 | 826 | spl_kmem_obj_t *sko, *n; |
827 | void *base, *obj; | |
8b45dda2 BB |
828 | uint32_t obj_size, offslab_size = 0; |
829 | int i, rc = 0; | |
48e0606a | 830 | |
a1502d76 | 831 | base = kv_alloc(skc, skc->skc_slab_size, flags); |
832 | if (base == NULL) | |
fece7c99 | 833 | RETURN(NULL); |
834 | ||
a1502d76 | 835 | sks = (spl_kmem_slab_t *)base; |
836 | sks->sks_magic = SKS_MAGIC; | |
837 | sks->sks_objs = skc->skc_slab_objs; | |
838 | sks->sks_age = jiffies; | |
839 | sks->sks_cache = skc; | |
840 | INIT_LIST_HEAD(&sks->sks_list); | |
841 | INIT_LIST_HEAD(&sks->sks_free_list); | |
842 | sks->sks_ref = 0; | |
8b45dda2 | 843 | obj_size = spl_obj_size(skc); |
48e0606a | 844 | |
8b45dda2 BB |
845 | if (skc->skc_flags * KMC_OFFSLAB) |
846 | offslab_size = spl_offslab_size(skc); | |
fece7c99 | 847 | |
848 | for (i = 0; i < sks->sks_objs; i++) { | |
a1502d76 | 849 | if (skc->skc_flags & KMC_OFFSLAB) { |
8b45dda2 | 850 | obj = kv_alloc(skc, offslab_size, flags); |
a1502d76 | 851 | if (!obj) |
852 | GOTO(out, rc = -ENOMEM); | |
853 | } else { | |
8b45dda2 | 854 | obj = base + spl_sks_size(skc) + (i * obj_size); |
a1502d76 | 855 | } |
856 | ||
8b45dda2 BB |
857 | ASSERT(IS_P2ALIGNED(obj, skc->skc_obj_align)); |
858 | sko = spl_sko_from_obj(skc, obj); | |
fece7c99 | 859 | sko->sko_addr = obj; |
860 | sko->sko_magic = SKO_MAGIC; | |
861 | sko->sko_slab = sks; | |
862 | INIT_LIST_HEAD(&sko->sko_list); | |
fece7c99 | 863 | list_add_tail(&sko->sko_list, &sks->sks_free_list); |
864 | } | |
865 | ||
fece7c99 | 866 | list_for_each_entry(sko, &sks->sks_free_list, sko_list) |
867 | if (skc->skc_ctor) | |
868 | skc->skc_ctor(sko->sko_addr, skc->skc_private, flags); | |
2fb9b26a | 869 | out: |
a1502d76 | 870 | if (rc) { |
871 | if (skc->skc_flags & KMC_OFFSLAB) | |
48e0606a BB |
872 | list_for_each_entry_safe(sko, n, &sks->sks_free_list, |
873 | sko_list) | |
8b45dda2 | 874 | kv_free(skc, sko->sko_addr, offslab_size); |
fece7c99 | 875 | |
a1502d76 | 876 | kv_free(skc, base, skc->skc_slab_size); |
877 | sks = NULL; | |
fece7c99 | 878 | } |
879 | ||
a1502d76 | 880 | RETURN(sks); |
fece7c99 | 881 | } |
882 | ||
ea3e6ca9 BB |
883 | /* |
884 | * Remove a slab from complete or partial list, it must be called with | |
885 | * the 'skc->skc_lock' held but the actual free must be performed | |
886 | * outside the lock to prevent deadlocking on vmem addresses. | |
fece7c99 | 887 | */ |
f1ca4da6 | 888 | static void |
ea3e6ca9 BB |
889 | spl_slab_free(spl_kmem_slab_t *sks, |
890 | struct list_head *sks_list, struct list_head *sko_list) | |
891 | { | |
2fb9b26a | 892 | spl_kmem_cache_t *skc; |
2fb9b26a | 893 | ENTRY; |
57d86234 | 894 | |
2fb9b26a | 895 | ASSERT(sks->sks_magic == SKS_MAGIC); |
4afaaefa | 896 | ASSERT(sks->sks_ref == 0); |
d6a26c6a | 897 | |
fece7c99 | 898 | skc = sks->sks_cache; |
899 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
d46630e0 | 900 | ASSERT(spin_is_locked(&skc->skc_lock)); |
f1ca4da6 | 901 | |
1a944a7d BB |
902 | /* |
903 | * Update slab/objects counters in the cache, then remove the | |
904 | * slab from the skc->skc_partial_list. Finally add the slab | |
905 | * and all its objects in to the private work lists where the | |
906 | * destructors will be called and the memory freed to the system. | |
907 | */ | |
fece7c99 | 908 | skc->skc_obj_total -= sks->sks_objs; |
909 | skc->skc_slab_total--; | |
910 | list_del(&sks->sks_list); | |
ea3e6ca9 | 911 | list_add(&sks->sks_list, sks_list); |
1a944a7d BB |
912 | list_splice_init(&sks->sks_free_list, sko_list); |
913 | ||
2fb9b26a | 914 | EXIT; |
915 | } | |
d6a26c6a | 916 | |
ea3e6ca9 BB |
917 | /* |
918 | * Traverses all the partial slabs attached to a cache and free those | |
919 | * which which are currently empty, and have not been touched for | |
37db7d8c BB |
920 | * skc_delay seconds to avoid thrashing. The count argument is |
921 | * passed to optionally cap the number of slabs reclaimed, a count | |
922 | * of zero means try and reclaim everything. When flag is set we | |
923 | * always free an available slab regardless of age. | |
ea3e6ca9 BB |
924 | */ |
925 | static void | |
37db7d8c | 926 | spl_slab_reclaim(spl_kmem_cache_t *skc, int count, int flag) |
2fb9b26a | 927 | { |
928 | spl_kmem_slab_t *sks, *m; | |
ea3e6ca9 BB |
929 | spl_kmem_obj_t *sko, *n; |
930 | LIST_HEAD(sks_list); | |
931 | LIST_HEAD(sko_list); | |
8b45dda2 BB |
932 | uint32_t size = 0; |
933 | int i = 0; | |
2fb9b26a | 934 | ENTRY; |
935 | ||
2fb9b26a | 936 | /* |
ea3e6ca9 BB |
937 | * Move empty slabs and objects which have not been touched in |
938 | * skc_delay seconds on to private lists to be freed outside | |
1a944a7d BB |
939 | * the spin lock. This delay time is important to avoid thrashing |
940 | * however when flag is set the delay will not be used. | |
2fb9b26a | 941 | */ |
ea3e6ca9 | 942 | spin_lock(&skc->skc_lock); |
1a944a7d BB |
943 | list_for_each_entry_safe_reverse(sks,m,&skc->skc_partial_list,sks_list){ |
944 | /* | |
945 | * All empty slabs are at the end of skc->skc_partial_list, | |
946 | * therefore once a non-empty slab is found we can stop | |
947 | * scanning. Additionally, stop when reaching the target | |
948 | * reclaim 'count' if a non-zero threshhold is given. | |
949 | */ | |
950 | if ((sks->sks_ref > 0) || (count && i > count)) | |
37db7d8c BB |
951 | break; |
952 | ||
37db7d8c | 953 | if (time_after(jiffies,sks->sks_age+skc->skc_delay*HZ)||flag) { |
ea3e6ca9 | 954 | spl_slab_free(sks, &sks_list, &sko_list); |
37db7d8c BB |
955 | i++; |
956 | } | |
ea3e6ca9 BB |
957 | } |
958 | spin_unlock(&skc->skc_lock); | |
959 | ||
960 | /* | |
1a944a7d BB |
961 | * The following two loops ensure all the object destructors are |
962 | * run, any offslab objects are freed, and the slabs themselves | |
963 | * are freed. This is all done outside the skc->skc_lock since | |
964 | * this allows the destructor to sleep, and allows us to perform | |
965 | * a conditional reschedule when a freeing a large number of | |
966 | * objects and slabs back to the system. | |
ea3e6ca9 | 967 | */ |
1a944a7d | 968 | if (skc->skc_flags & KMC_OFFSLAB) |
8b45dda2 | 969 | size = spl_offslab_size(skc); |
ea3e6ca9 | 970 | |
1a944a7d BB |
971 | list_for_each_entry_safe(sko, n, &sko_list, sko_list) { |
972 | ASSERT(sko->sko_magic == SKO_MAGIC); | |
973 | ||
974 | if (skc->skc_dtor) | |
975 | skc->skc_dtor(sko->sko_addr, skc->skc_private); | |
976 | ||
977 | if (skc->skc_flags & KMC_OFFSLAB) | |
ea3e6ca9 | 978 | kv_free(skc, sko->sko_addr, size); |
1a944a7d BB |
979 | |
980 | cond_resched(); | |
2fb9b26a | 981 | } |
982 | ||
37db7d8c | 983 | list_for_each_entry_safe(sks, m, &sks_list, sks_list) { |
1a944a7d | 984 | ASSERT(sks->sks_magic == SKS_MAGIC); |
ea3e6ca9 | 985 | kv_free(skc, sks, skc->skc_slab_size); |
37db7d8c BB |
986 | cond_resched(); |
987 | } | |
ea3e6ca9 BB |
988 | |
989 | EXIT; | |
f1ca4da6 | 990 | } |
991 | ||
ea3e6ca9 BB |
992 | /* |
993 | * Called regularly on all caches to age objects out of the magazines | |
994 | * which have not been access in skc->skc_delay seconds. This prevents | |
995 | * idle magazines from holding memory which might be better used by | |
996 | * other caches or parts of the system. The delay is present to | |
997 | * prevent thrashing the magazine. | |
998 | */ | |
999 | static void | |
1000 | spl_magazine_age(void *data) | |
f1ca4da6 | 1001 | { |
9b1b8e4c BB |
1002 | spl_kmem_magazine_t *skm = |
1003 | spl_get_work_data(data, spl_kmem_magazine_t, skm_work.work); | |
1004 | spl_kmem_cache_t *skc = skm->skm_cache; | |
1005 | int i = smp_processor_id(); | |
1006 | ||
1007 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
1008 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
1009 | ASSERT(skc->skc_mag[i] == skm); | |
f1ca4da6 | 1010 | |
ea3e6ca9 BB |
1011 | if (skm->skm_avail > 0 && |
1012 | time_after(jiffies, skm->skm_age + skc->skc_delay * HZ)) | |
1013 | (void)spl_cache_flush(skc, skm, skm->skm_refill); | |
9b1b8e4c BB |
1014 | |
1015 | if (!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)) | |
1016 | schedule_delayed_work_on(i, &skm->skm_work, | |
1017 | skc->skc_delay / 3 * HZ); | |
ea3e6ca9 | 1018 | } |
4efd4118 | 1019 | |
ea3e6ca9 BB |
1020 | /* |
1021 | * Called regularly to keep a downward pressure on the size of idle | |
1022 | * magazines and to release free slabs from the cache. This function | |
1023 | * never calls the registered reclaim function, that only occures | |
1024 | * under memory pressure or with a direct call to spl_kmem_reap(). | |
1025 | */ | |
1026 | static void | |
1027 | spl_cache_age(void *data) | |
1028 | { | |
9b1b8e4c | 1029 | spl_kmem_cache_t *skc = |
ea3e6ca9 BB |
1030 | spl_get_work_data(data, spl_kmem_cache_t, skc_work.work); |
1031 | ||
1032 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
37db7d8c | 1033 | spl_slab_reclaim(skc, skc->skc_reap, 0); |
ea3e6ca9 BB |
1034 | |
1035 | if (!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)) | |
37db7d8c | 1036 | schedule_delayed_work(&skc->skc_work, skc->skc_delay / 3 * HZ); |
2fb9b26a | 1037 | } |
f1ca4da6 | 1038 | |
ea3e6ca9 | 1039 | /* |
8b45dda2 | 1040 | * Size a slab based on the size of each aligned object plus spl_kmem_obj_t. |
ea3e6ca9 BB |
1041 | * When on-slab we want to target SPL_KMEM_CACHE_OBJ_PER_SLAB. However, |
1042 | * for very small objects we may end up with more than this so as not | |
1043 | * to waste space in the minimal allocation of a single page. Also for | |
1044 | * very large objects we may use as few as SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN, | |
1045 | * lower than this and we will fail. | |
1046 | */ | |
48e0606a BB |
1047 | static int |
1048 | spl_slab_size(spl_kmem_cache_t *skc, uint32_t *objs, uint32_t *size) | |
1049 | { | |
8b45dda2 | 1050 | uint32_t sks_size, obj_size, max_size; |
48e0606a BB |
1051 | |
1052 | if (skc->skc_flags & KMC_OFFSLAB) { | |
ea3e6ca9 | 1053 | *objs = SPL_KMEM_CACHE_OBJ_PER_SLAB; |
48e0606a BB |
1054 | *size = sizeof(spl_kmem_slab_t); |
1055 | } else { | |
8b45dda2 BB |
1056 | sks_size = spl_sks_size(skc); |
1057 | obj_size = spl_obj_size(skc); | |
ea3e6ca9 BB |
1058 | |
1059 | if (skc->skc_flags & KMC_KMEM) | |
aa600d8a | 1060 | max_size = ((uint32_t)1 << (MAX_ORDER-3)) * PAGE_SIZE; |
ea3e6ca9 BB |
1061 | else |
1062 | max_size = (32 * 1024 * 1024); | |
48e0606a | 1063 | |
8b45dda2 BB |
1064 | /* Power of two sized slab */ |
1065 | for (*size = PAGE_SIZE; *size <= max_size; *size *= 2) { | |
ea3e6ca9 BB |
1066 | *objs = (*size - sks_size) / obj_size; |
1067 | if (*objs >= SPL_KMEM_CACHE_OBJ_PER_SLAB) | |
1068 | RETURN(0); | |
1069 | } | |
48e0606a | 1070 | |
ea3e6ca9 | 1071 | /* |
8b45dda2 | 1072 | * Unable to satisfy target objects per slab, fall back to |
ea3e6ca9 BB |
1073 | * allocating a maximally sized slab and assuming it can |
1074 | * contain the minimum objects count use it. If not fail. | |
1075 | */ | |
1076 | *size = max_size; | |
1077 | *objs = (*size - sks_size) / obj_size; | |
1078 | if (*objs >= SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN) | |
1079 | RETURN(0); | |
48e0606a BB |
1080 | } |
1081 | ||
ea3e6ca9 | 1082 | RETURN(-ENOSPC); |
48e0606a BB |
1083 | } |
1084 | ||
ea3e6ca9 BB |
1085 | /* |
1086 | * Make a guess at reasonable per-cpu magazine size based on the size of | |
1087 | * each object and the cost of caching N of them in each magazine. Long | |
1088 | * term this should really adapt based on an observed usage heuristic. | |
1089 | */ | |
4afaaefa | 1090 | static int |
1091 | spl_magazine_size(spl_kmem_cache_t *skc) | |
1092 | { | |
8b45dda2 BB |
1093 | uint32_t obj_size = spl_obj_size(skc); |
1094 | int size; | |
4afaaefa | 1095 | ENTRY; |
1096 | ||
ea3e6ca9 | 1097 | /* Per-magazine sizes below assume a 4Kib page size */ |
8b45dda2 | 1098 | if (obj_size > (PAGE_SIZE * 256)) |
ea3e6ca9 | 1099 | size = 4; /* Minimum 4Mib per-magazine */ |
8b45dda2 | 1100 | else if (obj_size > (PAGE_SIZE * 32)) |
ea3e6ca9 | 1101 | size = 16; /* Minimum 2Mib per-magazine */ |
8b45dda2 | 1102 | else if (obj_size > (PAGE_SIZE)) |
ea3e6ca9 | 1103 | size = 64; /* Minimum 256Kib per-magazine */ |
8b45dda2 | 1104 | else if (obj_size > (PAGE_SIZE / 4)) |
ea3e6ca9 | 1105 | size = 128; /* Minimum 128Kib per-magazine */ |
4afaaefa | 1106 | else |
ea3e6ca9 | 1107 | size = 256; |
4afaaefa | 1108 | |
1109 | RETURN(size); | |
1110 | } | |
1111 | ||
ea3e6ca9 BB |
1112 | /* |
1113 | * Allocate a per-cpu magazine to assoicate with a specific core. | |
1114 | */ | |
4afaaefa | 1115 | static spl_kmem_magazine_t * |
1116 | spl_magazine_alloc(spl_kmem_cache_t *skc, int node) | |
1117 | { | |
1118 | spl_kmem_magazine_t *skm; | |
1119 | int size = sizeof(spl_kmem_magazine_t) + | |
1120 | sizeof(void *) * skc->skc_mag_size; | |
1121 | ENTRY; | |
1122 | ||
c89fdee4 | 1123 | skm = kmem_alloc_node(size, KM_SLEEP, node); |
4afaaefa | 1124 | if (skm) { |
1125 | skm->skm_magic = SKM_MAGIC; | |
1126 | skm->skm_avail = 0; | |
1127 | skm->skm_size = skc->skc_mag_size; | |
1128 | skm->skm_refill = skc->skc_mag_refill; | |
9b1b8e4c BB |
1129 | skm->skm_cache = skc; |
1130 | spl_init_delayed_work(&skm->skm_work, spl_magazine_age, skm); | |
ea3e6ca9 | 1131 | skm->skm_age = jiffies; |
4afaaefa | 1132 | } |
1133 | ||
1134 | RETURN(skm); | |
1135 | } | |
1136 | ||
ea3e6ca9 BB |
1137 | /* |
1138 | * Free a per-cpu magazine assoicated with a specific core. | |
1139 | */ | |
4afaaefa | 1140 | static void |
1141 | spl_magazine_free(spl_kmem_magazine_t *skm) | |
1142 | { | |
a0f6da3d | 1143 | int size = sizeof(spl_kmem_magazine_t) + |
1144 | sizeof(void *) * skm->skm_size; | |
1145 | ||
4afaaefa | 1146 | ENTRY; |
1147 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
1148 | ASSERT(skm->skm_avail == 0); | |
a0f6da3d | 1149 | |
1150 | kmem_free(skm, size); | |
4afaaefa | 1151 | EXIT; |
1152 | } | |
1153 | ||
ea3e6ca9 BB |
1154 | /* |
1155 | * Create all pre-cpu magazines of reasonable sizes. | |
1156 | */ | |
4afaaefa | 1157 | static int |
1158 | spl_magazine_create(spl_kmem_cache_t *skc) | |
1159 | { | |
37db7d8c | 1160 | int i; |
4afaaefa | 1161 | ENTRY; |
1162 | ||
1163 | skc->skc_mag_size = spl_magazine_size(skc); | |
ea3e6ca9 | 1164 | skc->skc_mag_refill = (skc->skc_mag_size + 1) / 2; |
4afaaefa | 1165 | |
37db7d8c BB |
1166 | for_each_online_cpu(i) { |
1167 | skc->skc_mag[i] = spl_magazine_alloc(skc, cpu_to_node(i)); | |
1168 | if (!skc->skc_mag[i]) { | |
1169 | for (i--; i >= 0; i--) | |
1170 | spl_magazine_free(skc->skc_mag[i]); | |
4afaaefa | 1171 | |
37db7d8c BB |
1172 | RETURN(-ENOMEM); |
1173 | } | |
1174 | } | |
4afaaefa | 1175 | |
9b1b8e4c BB |
1176 | /* Only after everything is allocated schedule magazine work */ |
1177 | for_each_online_cpu(i) | |
1178 | schedule_delayed_work_on(i, &skc->skc_mag[i]->skm_work, | |
1179 | skc->skc_delay / 3 * HZ); | |
1180 | ||
37db7d8c | 1181 | RETURN(0); |
4afaaefa | 1182 | } |
1183 | ||
ea3e6ca9 BB |
1184 | /* |
1185 | * Destroy all pre-cpu magazines. | |
1186 | */ | |
4afaaefa | 1187 | static void |
1188 | spl_magazine_destroy(spl_kmem_cache_t *skc) | |
1189 | { | |
37db7d8c BB |
1190 | spl_kmem_magazine_t *skm; |
1191 | int i; | |
4afaaefa | 1192 | ENTRY; |
37db7d8c BB |
1193 | |
1194 | for_each_online_cpu(i) { | |
1195 | skm = skc->skc_mag[i]; | |
1196 | (void)spl_cache_flush(skc, skm, skm->skm_avail); | |
1197 | spl_magazine_free(skm); | |
1198 | } | |
1199 | ||
4afaaefa | 1200 | EXIT; |
1201 | } | |
1202 | ||
ea3e6ca9 BB |
1203 | /* |
1204 | * Create a object cache based on the following arguments: | |
1205 | * name cache name | |
1206 | * size cache object size | |
1207 | * align cache object alignment | |
1208 | * ctor cache object constructor | |
1209 | * dtor cache object destructor | |
1210 | * reclaim cache object reclaim | |
1211 | * priv cache private data for ctor/dtor/reclaim | |
1212 | * vmp unused must be NULL | |
1213 | * flags | |
1214 | * KMC_NOTOUCH Disable cache object aging (unsupported) | |
1215 | * KMC_NODEBUG Disable debugging (unsupported) | |
1216 | * KMC_NOMAGAZINE Disable magazine (unsupported) | |
1217 | * KMC_NOHASH Disable hashing (unsupported) | |
1218 | * KMC_QCACHE Disable qcache (unsupported) | |
1219 | * KMC_KMEM Force kmem backed cache | |
1220 | * KMC_VMEM Force vmem backed cache | |
1221 | * KMC_OFFSLAB Locate objects off the slab | |
1222 | */ | |
2fb9b26a | 1223 | spl_kmem_cache_t * |
1224 | spl_kmem_cache_create(char *name, size_t size, size_t align, | |
1225 | spl_kmem_ctor_t ctor, | |
1226 | spl_kmem_dtor_t dtor, | |
1227 | spl_kmem_reclaim_t reclaim, | |
1228 | void *priv, void *vmp, int flags) | |
1229 | { | |
1230 | spl_kmem_cache_t *skc; | |
a1502d76 | 1231 | int rc, kmem_flags = KM_SLEEP; |
2fb9b26a | 1232 | ENTRY; |
937879f1 | 1233 | |
a1502d76 | 1234 | ASSERTF(!(flags & KMC_NOMAGAZINE), "Bad KMC_NOMAGAZINE (%x)\n", flags); |
1235 | ASSERTF(!(flags & KMC_NOHASH), "Bad KMC_NOHASH (%x)\n", flags); | |
1236 | ASSERTF(!(flags & KMC_QCACHE), "Bad KMC_QCACHE (%x)\n", flags); | |
48e0606a | 1237 | ASSERT(vmp == NULL); |
a1502d76 | 1238 | |
2fb9b26a | 1239 | /* We may be called when there is a non-zero preempt_count or |
1240 | * interrupts are disabled is which case we must not sleep. | |
1241 | */ | |
e9d7a2be | 1242 | if (current_thread_info()->preempt_count || irqs_disabled()) |
2fb9b26a | 1243 | kmem_flags = KM_NOSLEEP; |
0a6fd143 | 1244 | |
2fb9b26a | 1245 | /* Allocate new cache memory and initialize. */ |
ff449ac4 | 1246 | skc = (spl_kmem_cache_t *)kmem_zalloc(sizeof(*skc), kmem_flags); |
e9d7a2be | 1247 | if (skc == NULL) |
2fb9b26a | 1248 | RETURN(NULL); |
d61e12af | 1249 | |
2fb9b26a | 1250 | skc->skc_magic = SKC_MAGIC; |
2fb9b26a | 1251 | skc->skc_name_size = strlen(name) + 1; |
1252 | skc->skc_name = (char *)kmem_alloc(skc->skc_name_size, kmem_flags); | |
1253 | if (skc->skc_name == NULL) { | |
1254 | kmem_free(skc, sizeof(*skc)); | |
1255 | RETURN(NULL); | |
1256 | } | |
1257 | strncpy(skc->skc_name, name, skc->skc_name_size); | |
1258 | ||
e9d7a2be | 1259 | skc->skc_ctor = ctor; |
1260 | skc->skc_dtor = dtor; | |
1261 | skc->skc_reclaim = reclaim; | |
2fb9b26a | 1262 | skc->skc_private = priv; |
1263 | skc->skc_vmp = vmp; | |
1264 | skc->skc_flags = flags; | |
1265 | skc->skc_obj_size = size; | |
48e0606a | 1266 | skc->skc_obj_align = SPL_KMEM_CACHE_ALIGN; |
2fb9b26a | 1267 | skc->skc_delay = SPL_KMEM_CACHE_DELAY; |
37db7d8c | 1268 | skc->skc_reap = SPL_KMEM_CACHE_REAP; |
ea3e6ca9 | 1269 | atomic_set(&skc->skc_ref, 0); |
2fb9b26a | 1270 | |
2fb9b26a | 1271 | INIT_LIST_HEAD(&skc->skc_list); |
1272 | INIT_LIST_HEAD(&skc->skc_complete_list); | |
1273 | INIT_LIST_HEAD(&skc->skc_partial_list); | |
d46630e0 | 1274 | spin_lock_init(&skc->skc_lock); |
e9d7a2be | 1275 | skc->skc_slab_fail = 0; |
1276 | skc->skc_slab_create = 0; | |
1277 | skc->skc_slab_destroy = 0; | |
2fb9b26a | 1278 | skc->skc_slab_total = 0; |
1279 | skc->skc_slab_alloc = 0; | |
1280 | skc->skc_slab_max = 0; | |
1281 | skc->skc_obj_total = 0; | |
1282 | skc->skc_obj_alloc = 0; | |
1283 | skc->skc_obj_max = 0; | |
a1502d76 | 1284 | |
48e0606a | 1285 | if (align) { |
8b45dda2 BB |
1286 | VERIFY(ISP2(align)); |
1287 | VERIFY3U(align, >=, SPL_KMEM_CACHE_ALIGN); /* Min alignment */ | |
1288 | VERIFY3U(align, <=, PAGE_SIZE); /* Max alignment */ | |
48e0606a BB |
1289 | skc->skc_obj_align = align; |
1290 | } | |
1291 | ||
a1502d76 | 1292 | /* If none passed select a cache type based on object size */ |
1293 | if (!(skc->skc_flags & (KMC_KMEM | KMC_VMEM))) { | |
8b45dda2 | 1294 | if (spl_obj_size(skc) < (PAGE_SIZE / 8)) |
a1502d76 | 1295 | skc->skc_flags |= KMC_KMEM; |
8b45dda2 | 1296 | else |
a1502d76 | 1297 | skc->skc_flags |= KMC_VMEM; |
a1502d76 | 1298 | } |
1299 | ||
48e0606a BB |
1300 | rc = spl_slab_size(skc, &skc->skc_slab_objs, &skc->skc_slab_size); |
1301 | if (rc) | |
1302 | GOTO(out, rc); | |
4afaaefa | 1303 | |
1304 | rc = spl_magazine_create(skc); | |
48e0606a BB |
1305 | if (rc) |
1306 | GOTO(out, rc); | |
2fb9b26a | 1307 | |
ea3e6ca9 | 1308 | spl_init_delayed_work(&skc->skc_work, spl_cache_age, skc); |
37db7d8c | 1309 | schedule_delayed_work(&skc->skc_work, skc->skc_delay / 3 * HZ); |
ea3e6ca9 | 1310 | |
2fb9b26a | 1311 | down_write(&spl_kmem_cache_sem); |
e9d7a2be | 1312 | list_add_tail(&skc->skc_list, &spl_kmem_cache_list); |
2fb9b26a | 1313 | up_write(&spl_kmem_cache_sem); |
1314 | ||
e9d7a2be | 1315 | RETURN(skc); |
48e0606a BB |
1316 | out: |
1317 | kmem_free(skc->skc_name, skc->skc_name_size); | |
1318 | kmem_free(skc, sizeof(*skc)); | |
1319 | RETURN(NULL); | |
f1ca4da6 | 1320 | } |
2fb9b26a | 1321 | EXPORT_SYMBOL(spl_kmem_cache_create); |
f1ca4da6 | 1322 | |
ea3e6ca9 BB |
1323 | /* |
1324 | * Destroy a cache and all objects assoicated with the cache. | |
1325 | */ | |
2fb9b26a | 1326 | void |
1327 | spl_kmem_cache_destroy(spl_kmem_cache_t *skc) | |
f1ca4da6 | 1328 | { |
ea3e6ca9 | 1329 | DECLARE_WAIT_QUEUE_HEAD(wq); |
9b1b8e4c | 1330 | int i; |
2fb9b26a | 1331 | ENTRY; |
f1ca4da6 | 1332 | |
e9d7a2be | 1333 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1334 | ||
1335 | down_write(&spl_kmem_cache_sem); | |
1336 | list_del_init(&skc->skc_list); | |
1337 | up_write(&spl_kmem_cache_sem); | |
2fb9b26a | 1338 | |
ea3e6ca9 BB |
1339 | /* Cancel any and wait for any pending delayed work */ |
1340 | ASSERT(!test_and_set_bit(KMC_BIT_DESTROY, &skc->skc_flags)); | |
1341 | cancel_delayed_work(&skc->skc_work); | |
9b1b8e4c BB |
1342 | for_each_online_cpu(i) |
1343 | cancel_delayed_work(&skc->skc_mag[i]->skm_work); | |
1344 | ||
ea3e6ca9 BB |
1345 | flush_scheduled_work(); |
1346 | ||
1347 | /* Wait until all current callers complete, this is mainly | |
1348 | * to catch the case where a low memory situation triggers a | |
1349 | * cache reaping action which races with this destroy. */ | |
1350 | wait_event(wq, atomic_read(&skc->skc_ref) == 0); | |
1351 | ||
4afaaefa | 1352 | spl_magazine_destroy(skc); |
37db7d8c | 1353 | spl_slab_reclaim(skc, 0, 1); |
d46630e0 | 1354 | spin_lock(&skc->skc_lock); |
d6a26c6a | 1355 | |
2fb9b26a | 1356 | /* Validate there are no objects in use and free all the |
4afaaefa | 1357 | * spl_kmem_slab_t, spl_kmem_obj_t, and object buffers. */ |
ea3e6ca9 BB |
1358 | ASSERT3U(skc->skc_slab_alloc, ==, 0); |
1359 | ASSERT3U(skc->skc_obj_alloc, ==, 0); | |
1360 | ASSERT3U(skc->skc_slab_total, ==, 0); | |
1361 | ASSERT3U(skc->skc_obj_total, ==, 0); | |
2fb9b26a | 1362 | ASSERT(list_empty(&skc->skc_complete_list)); |
a1502d76 | 1363 | |
2fb9b26a | 1364 | kmem_free(skc->skc_name, skc->skc_name_size); |
d46630e0 | 1365 | spin_unlock(&skc->skc_lock); |
ff449ac4 | 1366 | |
4afaaefa | 1367 | kmem_free(skc, sizeof(*skc)); |
2fb9b26a | 1368 | |
1369 | EXIT; | |
f1ca4da6 | 1370 | } |
2fb9b26a | 1371 | EXPORT_SYMBOL(spl_kmem_cache_destroy); |
f1ca4da6 | 1372 | |
ea3e6ca9 BB |
1373 | /* |
1374 | * Allocate an object from a slab attached to the cache. This is used to | |
1375 | * repopulate the per-cpu magazine caches in batches when they run low. | |
1376 | */ | |
4afaaefa | 1377 | static void * |
1378 | spl_cache_obj(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks) | |
f1ca4da6 | 1379 | { |
2fb9b26a | 1380 | spl_kmem_obj_t *sko; |
f1ca4da6 | 1381 | |
e9d7a2be | 1382 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1383 | ASSERT(sks->sks_magic == SKS_MAGIC); | |
4afaaefa | 1384 | ASSERT(spin_is_locked(&skc->skc_lock)); |
2fb9b26a | 1385 | |
a1502d76 | 1386 | sko = list_entry(sks->sks_free_list.next, spl_kmem_obj_t, sko_list); |
4afaaefa | 1387 | ASSERT(sko->sko_magic == SKO_MAGIC); |
1388 | ASSERT(sko->sko_addr != NULL); | |
2fb9b26a | 1389 | |
a1502d76 | 1390 | /* Remove from sks_free_list */ |
4afaaefa | 1391 | list_del_init(&sko->sko_list); |
2fb9b26a | 1392 | |
4afaaefa | 1393 | sks->sks_age = jiffies; |
1394 | sks->sks_ref++; | |
1395 | skc->skc_obj_alloc++; | |
2fb9b26a | 1396 | |
4afaaefa | 1397 | /* Track max obj usage statistics */ |
1398 | if (skc->skc_obj_alloc > skc->skc_obj_max) | |
1399 | skc->skc_obj_max = skc->skc_obj_alloc; | |
2fb9b26a | 1400 | |
4afaaefa | 1401 | /* Track max slab usage statistics */ |
1402 | if (sks->sks_ref == 1) { | |
1403 | skc->skc_slab_alloc++; | |
f1ca4da6 | 1404 | |
4afaaefa | 1405 | if (skc->skc_slab_alloc > skc->skc_slab_max) |
1406 | skc->skc_slab_max = skc->skc_slab_alloc; | |
2fb9b26a | 1407 | } |
1408 | ||
4afaaefa | 1409 | return sko->sko_addr; |
1410 | } | |
c30df9c8 | 1411 | |
ea3e6ca9 BB |
1412 | /* |
1413 | * No available objects on any slabsi, create a new slab. Since this | |
1414 | * is an expensive operation we do it without holding the spinlock and | |
1415 | * only briefly aquire it when we link in the fully allocated and | |
1416 | * constructed slab. | |
4afaaefa | 1417 | */ |
1418 | static spl_kmem_slab_t * | |
1419 | spl_cache_grow(spl_kmem_cache_t *skc, int flags) | |
1420 | { | |
e9d7a2be | 1421 | spl_kmem_slab_t *sks; |
4afaaefa | 1422 | ENTRY; |
f1ca4da6 | 1423 | |
e9d7a2be | 1424 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
1425 | local_irq_enable(); |
1426 | might_sleep(); | |
e9d7a2be | 1427 | |
ea3e6ca9 BB |
1428 | /* |
1429 | * Before allocating a new slab check if the slab is being reaped. | |
1430 | * If it is there is a good chance we can wait until it finishes | |
1431 | * and then use one of the newly freed but not aged-out slabs. | |
1432 | */ | |
1433 | if (test_bit(KMC_BIT_REAPING, &skc->skc_flags)) { | |
1434 | schedule(); | |
1435 | GOTO(out, sks= NULL); | |
4afaaefa | 1436 | } |
2fb9b26a | 1437 | |
ea3e6ca9 BB |
1438 | /* Allocate a new slab for the cache */ |
1439 | sks = spl_slab_alloc(skc, flags | __GFP_NORETRY | __GFP_NOWARN); | |
1440 | if (sks == NULL) | |
1441 | GOTO(out, sks = NULL); | |
4afaaefa | 1442 | |
ea3e6ca9 | 1443 | /* Link the new empty slab in to the end of skc_partial_list. */ |
d46630e0 | 1444 | spin_lock(&skc->skc_lock); |
2fb9b26a | 1445 | skc->skc_slab_total++; |
1446 | skc->skc_obj_total += sks->sks_objs; | |
1447 | list_add_tail(&sks->sks_list, &skc->skc_partial_list); | |
d46630e0 | 1448 | spin_unlock(&skc->skc_lock); |
ea3e6ca9 BB |
1449 | out: |
1450 | local_irq_disable(); | |
4afaaefa | 1451 | |
1452 | RETURN(sks); | |
f1ca4da6 | 1453 | } |
1454 | ||
ea3e6ca9 BB |
1455 | /* |
1456 | * Refill a per-cpu magazine with objects from the slabs for this | |
1457 | * cache. Ideally the magazine can be repopulated using existing | |
1458 | * objects which have been released, however if we are unable to | |
1459 | * locate enough free objects new slabs of objects will be created. | |
1460 | */ | |
4afaaefa | 1461 | static int |
1462 | spl_cache_refill(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flags) | |
f1ca4da6 | 1463 | { |
e9d7a2be | 1464 | spl_kmem_slab_t *sks; |
1465 | int rc = 0, refill; | |
937879f1 | 1466 | ENTRY; |
f1ca4da6 | 1467 | |
e9d7a2be | 1468 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1469 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
1470 | ||
e9d7a2be | 1471 | refill = MIN(skm->skm_refill, skm->skm_size - skm->skm_avail); |
d46630e0 | 1472 | spin_lock(&skc->skc_lock); |
ff449ac4 | 1473 | |
4afaaefa | 1474 | while (refill > 0) { |
ea3e6ca9 | 1475 | /* No slabs available we may need to grow the cache */ |
4afaaefa | 1476 | if (list_empty(&skc->skc_partial_list)) { |
1477 | spin_unlock(&skc->skc_lock); | |
ff449ac4 | 1478 | |
4afaaefa | 1479 | sks = spl_cache_grow(skc, flags); |
1480 | if (!sks) | |
e9d7a2be | 1481 | GOTO(out, rc); |
4afaaefa | 1482 | |
1483 | /* Rescheduled to different CPU skm is not local */ | |
1484 | if (skm != skc->skc_mag[smp_processor_id()]) | |
e9d7a2be | 1485 | GOTO(out, rc); |
1486 | ||
1487 | /* Potentially rescheduled to the same CPU but | |
1488 | * allocations may have occured from this CPU while | |
1489 | * we were sleeping so recalculate max refill. */ | |
1490 | refill = MIN(refill, skm->skm_size - skm->skm_avail); | |
4afaaefa | 1491 | |
1492 | spin_lock(&skc->skc_lock); | |
1493 | continue; | |
1494 | } | |
d46630e0 | 1495 | |
4afaaefa | 1496 | /* Grab the next available slab */ |
1497 | sks = list_entry((&skc->skc_partial_list)->next, | |
1498 | spl_kmem_slab_t, sks_list); | |
1499 | ASSERT(sks->sks_magic == SKS_MAGIC); | |
1500 | ASSERT(sks->sks_ref < sks->sks_objs); | |
1501 | ASSERT(!list_empty(&sks->sks_free_list)); | |
d46630e0 | 1502 | |
4afaaefa | 1503 | /* Consume as many objects as needed to refill the requested |
e9d7a2be | 1504 | * cache. We must also be careful not to overfill it. */ |
1505 | while (sks->sks_ref < sks->sks_objs && refill-- > 0 && ++rc) { | |
1506 | ASSERT(skm->skm_avail < skm->skm_size); | |
1507 | ASSERT(rc < skm->skm_size); | |
4afaaefa | 1508 | skm->skm_objs[skm->skm_avail++]=spl_cache_obj(skc,sks); |
e9d7a2be | 1509 | } |
f1ca4da6 | 1510 | |
4afaaefa | 1511 | /* Move slab to skc_complete_list when full */ |
1512 | if (sks->sks_ref == sks->sks_objs) { | |
1513 | list_del(&sks->sks_list); | |
1514 | list_add(&sks->sks_list, &skc->skc_complete_list); | |
2fb9b26a | 1515 | } |
1516 | } | |
57d86234 | 1517 | |
4afaaefa | 1518 | spin_unlock(&skc->skc_lock); |
1519 | out: | |
1520 | /* Returns the number of entries added to cache */ | |
e9d7a2be | 1521 | RETURN(rc); |
4afaaefa | 1522 | } |
1523 | ||
ea3e6ca9 BB |
1524 | /* |
1525 | * Release an object back to the slab from which it came. | |
1526 | */ | |
4afaaefa | 1527 | static void |
1528 | spl_cache_shrink(spl_kmem_cache_t *skc, void *obj) | |
1529 | { | |
e9d7a2be | 1530 | spl_kmem_slab_t *sks = NULL; |
4afaaefa | 1531 | spl_kmem_obj_t *sko = NULL; |
1532 | ENTRY; | |
1533 | ||
e9d7a2be | 1534 | ASSERT(skc->skc_magic == SKC_MAGIC); |
4afaaefa | 1535 | ASSERT(spin_is_locked(&skc->skc_lock)); |
1536 | ||
8b45dda2 | 1537 | sko = spl_sko_from_obj(skc, obj); |
a1502d76 | 1538 | ASSERT(sko->sko_magic == SKO_MAGIC); |
4afaaefa | 1539 | sks = sko->sko_slab; |
a1502d76 | 1540 | ASSERT(sks->sks_magic == SKS_MAGIC); |
2fb9b26a | 1541 | ASSERT(sks->sks_cache == skc); |
2fb9b26a | 1542 | list_add(&sko->sko_list, &sks->sks_free_list); |
d6a26c6a | 1543 | |
2fb9b26a | 1544 | sks->sks_age = jiffies; |
4afaaefa | 1545 | sks->sks_ref--; |
2fb9b26a | 1546 | skc->skc_obj_alloc--; |
f1ca4da6 | 1547 | |
2fb9b26a | 1548 | /* Move slab to skc_partial_list when no longer full. Slabs |
4afaaefa | 1549 | * are added to the head to keep the partial list is quasi-full |
1550 | * sorted order. Fuller at the head, emptier at the tail. */ | |
1551 | if (sks->sks_ref == (sks->sks_objs - 1)) { | |
2fb9b26a | 1552 | list_del(&sks->sks_list); |
1553 | list_add(&sks->sks_list, &skc->skc_partial_list); | |
1554 | } | |
f1ca4da6 | 1555 | |
2fb9b26a | 1556 | /* Move emply slabs to the end of the partial list so |
4afaaefa | 1557 | * they can be easily found and freed during reclamation. */ |
1558 | if (sks->sks_ref == 0) { | |
2fb9b26a | 1559 | list_del(&sks->sks_list); |
1560 | list_add_tail(&sks->sks_list, &skc->skc_partial_list); | |
1561 | skc->skc_slab_alloc--; | |
1562 | } | |
1563 | ||
4afaaefa | 1564 | EXIT; |
1565 | } | |
1566 | ||
ea3e6ca9 BB |
1567 | /* |
1568 | * Release a batch of objects from a per-cpu magazine back to their | |
1569 | * respective slabs. This occurs when we exceed the magazine size, | |
1570 | * are under memory pressure, when the cache is idle, or during | |
1571 | * cache cleanup. The flush argument contains the number of entries | |
1572 | * to remove from the magazine. | |
1573 | */ | |
4afaaefa | 1574 | static int |
1575 | spl_cache_flush(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flush) | |
1576 | { | |
1577 | int i, count = MIN(flush, skm->skm_avail); | |
1578 | ENTRY; | |
1579 | ||
e9d7a2be | 1580 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1581 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
4afaaefa | 1582 | |
ea3e6ca9 BB |
1583 | /* |
1584 | * XXX: Currently we simply return objects from the magazine to | |
1585 | * the slabs in fifo order. The ideal thing to do from a memory | |
1586 | * fragmentation standpoint is to cheaply determine the set of | |
1587 | * objects in the magazine which will result in the largest | |
1588 | * number of free slabs if released from the magazine. | |
1589 | */ | |
4afaaefa | 1590 | spin_lock(&skc->skc_lock); |
1591 | for (i = 0; i < count; i++) | |
1592 | spl_cache_shrink(skc, skm->skm_objs[i]); | |
1593 | ||
e9d7a2be | 1594 | skm->skm_avail -= count; |
1595 | memmove(skm->skm_objs, &(skm->skm_objs[count]), | |
4afaaefa | 1596 | sizeof(void *) * skm->skm_avail); |
1597 | ||
d46630e0 | 1598 | spin_unlock(&skc->skc_lock); |
4afaaefa | 1599 | |
1600 | RETURN(count); | |
1601 | } | |
1602 | ||
ea3e6ca9 BB |
1603 | /* |
1604 | * Allocate an object from the per-cpu magazine, or if the magazine | |
1605 | * is empty directly allocate from a slab and repopulate the magazine. | |
1606 | */ | |
4afaaefa | 1607 | void * |
1608 | spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags) | |
1609 | { | |
1610 | spl_kmem_magazine_t *skm; | |
1611 | unsigned long irq_flags; | |
1612 | void *obj = NULL; | |
1613 | ENTRY; | |
1614 | ||
e9d7a2be | 1615 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
1616 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
1617 | ASSERT(flags & KM_SLEEP); | |
1618 | atomic_inc(&skc->skc_ref); | |
4afaaefa | 1619 | local_irq_save(irq_flags); |
1620 | ||
1621 | restart: | |
1622 | /* Safe to update per-cpu structure without lock, but | |
1623 | * in the restart case we must be careful to reaquire | |
1624 | * the local magazine since this may have changed | |
1625 | * when we need to grow the cache. */ | |
1626 | skm = skc->skc_mag[smp_processor_id()]; | |
e9d7a2be | 1627 | ASSERTF(skm->skm_magic == SKM_MAGIC, "%x != %x: %s/%p/%p %x/%x/%x\n", |
1628 | skm->skm_magic, SKM_MAGIC, skc->skc_name, skc, skm, | |
1629 | skm->skm_size, skm->skm_refill, skm->skm_avail); | |
4afaaefa | 1630 | |
1631 | if (likely(skm->skm_avail)) { | |
1632 | /* Object available in CPU cache, use it */ | |
1633 | obj = skm->skm_objs[--skm->skm_avail]; | |
ea3e6ca9 | 1634 | skm->skm_age = jiffies; |
4afaaefa | 1635 | } else { |
1636 | /* Per-CPU cache empty, directly allocate from | |
1637 | * the slab and refill the per-CPU cache. */ | |
1638 | (void)spl_cache_refill(skc, skm, flags); | |
1639 | GOTO(restart, obj = NULL); | |
1640 | } | |
1641 | ||
1642 | local_irq_restore(irq_flags); | |
fece7c99 | 1643 | ASSERT(obj); |
8b45dda2 | 1644 | ASSERT(IS_P2ALIGNED(obj, skc->skc_obj_align)); |
4afaaefa | 1645 | |
1646 | /* Pre-emptively migrate object to CPU L1 cache */ | |
1647 | prefetchw(obj); | |
ea3e6ca9 | 1648 | atomic_dec(&skc->skc_ref); |
4afaaefa | 1649 | |
1650 | RETURN(obj); | |
1651 | } | |
1652 | EXPORT_SYMBOL(spl_kmem_cache_alloc); | |
1653 | ||
ea3e6ca9 BB |
1654 | /* |
1655 | * Free an object back to the local per-cpu magazine, there is no | |
1656 | * guarantee that this is the same magazine the object was originally | |
1657 | * allocated from. We may need to flush entire from the magazine | |
1658 | * back to the slabs to make space. | |
1659 | */ | |
4afaaefa | 1660 | void |
1661 | spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj) | |
1662 | { | |
1663 | spl_kmem_magazine_t *skm; | |
1664 | unsigned long flags; | |
1665 | ENTRY; | |
1666 | ||
e9d7a2be | 1667 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
1668 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
1669 | atomic_inc(&skc->skc_ref); | |
4afaaefa | 1670 | local_irq_save(flags); |
1671 | ||
1672 | /* Safe to update per-cpu structure without lock, but | |
1673 | * no remote memory allocation tracking is being performed | |
1674 | * it is entirely possible to allocate an object from one | |
1675 | * CPU cache and return it to another. */ | |
1676 | skm = skc->skc_mag[smp_processor_id()]; | |
e9d7a2be | 1677 | ASSERT(skm->skm_magic == SKM_MAGIC); |
4afaaefa | 1678 | |
1679 | /* Per-CPU cache full, flush it to make space */ | |
1680 | if (unlikely(skm->skm_avail >= skm->skm_size)) | |
1681 | (void)spl_cache_flush(skc, skm, skm->skm_refill); | |
1682 | ||
1683 | /* Available space in cache, use it */ | |
1684 | skm->skm_objs[skm->skm_avail++] = obj; | |
1685 | ||
1686 | local_irq_restore(flags); | |
ea3e6ca9 | 1687 | atomic_dec(&skc->skc_ref); |
4afaaefa | 1688 | |
1689 | EXIT; | |
f1ca4da6 | 1690 | } |
2fb9b26a | 1691 | EXPORT_SYMBOL(spl_kmem_cache_free); |
5c2bb9b2 | 1692 | |
ea3e6ca9 BB |
1693 | /* |
1694 | * The generic shrinker function for all caches. Under linux a shrinker | |
1695 | * may not be tightly coupled with a slab cache. In fact linux always | |
1696 | * systematically trys calling all registered shrinker callbacks which | |
1697 | * report that they contain unused objects. Because of this we only | |
1698 | * register one shrinker function in the shim layer for all slab caches. | |
1699 | * We always attempt to shrink all caches when this generic shrinker | |
1700 | * is called. The shrinker should return the number of free objects | |
1701 | * in the cache when called with nr_to_scan == 0 but not attempt to | |
1702 | * free any objects. When nr_to_scan > 0 it is a request that nr_to_scan | |
1703 | * objects should be freed, because Solaris semantics are to free | |
1704 | * all available objects we may free more objects than requested. | |
1705 | */ | |
2fb9b26a | 1706 | static int |
4afaaefa | 1707 | spl_kmem_cache_generic_shrinker(int nr_to_scan, unsigned int gfp_mask) |
2fb9b26a | 1708 | { |
e9d7a2be | 1709 | spl_kmem_cache_t *skc; |
ea3e6ca9 | 1710 | int unused = 0; |
5c2bb9b2 | 1711 | |
e9d7a2be | 1712 | down_read(&spl_kmem_cache_sem); |
ea3e6ca9 BB |
1713 | list_for_each_entry(skc, &spl_kmem_cache_list, skc_list) { |
1714 | if (nr_to_scan) | |
1715 | spl_kmem_cache_reap_now(skc); | |
1716 | ||
1717 | /* | |
1718 | * Presume everything alloc'ed in reclaimable, this ensures | |
1719 | * we are called again with nr_to_scan > 0 so can try and | |
1720 | * reclaim. The exact number is not important either so | |
1721 | * we forgo taking this already highly contented lock. | |
1722 | */ | |
1723 | unused += skc->skc_obj_alloc; | |
1724 | } | |
e9d7a2be | 1725 | up_read(&spl_kmem_cache_sem); |
2fb9b26a | 1726 | |
ea3e6ca9 | 1727 | return (unused * sysctl_vfs_cache_pressure) / 100; |
5c2bb9b2 | 1728 | } |
5c2bb9b2 | 1729 | |
ea3e6ca9 BB |
1730 | /* |
1731 | * Call the registered reclaim function for a cache. Depending on how | |
1732 | * many and which objects are released it may simply repopulate the | |
1733 | * local magazine which will then need to age-out. Objects which cannot | |
1734 | * fit in the magazine we will be released back to their slabs which will | |
1735 | * also need to age out before being release. This is all just best | |
1736 | * effort and we do not want to thrash creating and destroying slabs. | |
1737 | */ | |
57d86234 | 1738 | void |
2fb9b26a | 1739 | spl_kmem_cache_reap_now(spl_kmem_cache_t *skc) |
57d86234 | 1740 | { |
2fb9b26a | 1741 | ENTRY; |
e9d7a2be | 1742 | |
1743 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
ea3e6ca9 | 1744 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
2fb9b26a | 1745 | |
ea3e6ca9 BB |
1746 | /* Prevent concurrent cache reaping when contended */ |
1747 | if (test_and_set_bit(KMC_BIT_REAPING, &skc->skc_flags)) { | |
1748 | EXIT; | |
1749 | return; | |
1750 | } | |
2fb9b26a | 1751 | |
ea3e6ca9 | 1752 | atomic_inc(&skc->skc_ref); |
4afaaefa | 1753 | |
ea3e6ca9 BB |
1754 | if (skc->skc_reclaim) |
1755 | skc->skc_reclaim(skc->skc_private); | |
4afaaefa | 1756 | |
37db7d8c | 1757 | spl_slab_reclaim(skc, skc->skc_reap, 0); |
ea3e6ca9 BB |
1758 | clear_bit(KMC_BIT_REAPING, &skc->skc_flags); |
1759 | atomic_dec(&skc->skc_ref); | |
4afaaefa | 1760 | |
2fb9b26a | 1761 | EXIT; |
57d86234 | 1762 | } |
2fb9b26a | 1763 | EXPORT_SYMBOL(spl_kmem_cache_reap_now); |
57d86234 | 1764 | |
ea3e6ca9 BB |
1765 | /* |
1766 | * Reap all free slabs from all registered caches. | |
1767 | */ | |
f1b59d26 | 1768 | void |
2fb9b26a | 1769 | spl_kmem_reap(void) |
937879f1 | 1770 | { |
4afaaefa | 1771 | spl_kmem_cache_generic_shrinker(KMC_REAP_CHUNK, GFP_KERNEL); |
f1ca4da6 | 1772 | } |
2fb9b26a | 1773 | EXPORT_SYMBOL(spl_kmem_reap); |
5d86345d | 1774 | |
ff449ac4 | 1775 | #if defined(DEBUG_KMEM) && defined(DEBUG_KMEM_TRACKING) |
c6dc93d6 | 1776 | static char * |
4afaaefa | 1777 | spl_sprintf_addr(kmem_debug_t *kd, char *str, int len, int min) |
d6a26c6a | 1778 | { |
e9d7a2be | 1779 | int size = ((len - 1) < kd->kd_size) ? (len - 1) : kd->kd_size; |
d6a26c6a | 1780 | int i, flag = 1; |
1781 | ||
1782 | ASSERT(str != NULL && len >= 17); | |
e9d7a2be | 1783 | memset(str, 0, len); |
d6a26c6a | 1784 | |
1785 | /* Check for a fully printable string, and while we are at | |
1786 | * it place the printable characters in the passed buffer. */ | |
1787 | for (i = 0; i < size; i++) { | |
e9d7a2be | 1788 | str[i] = ((char *)(kd->kd_addr))[i]; |
1789 | if (isprint(str[i])) { | |
1790 | continue; | |
1791 | } else { | |
1792 | /* Minimum number of printable characters found | |
1793 | * to make it worthwhile to print this as ascii. */ | |
1794 | if (i > min) | |
1795 | break; | |
1796 | ||
1797 | flag = 0; | |
1798 | break; | |
1799 | } | |
d6a26c6a | 1800 | } |
1801 | ||
1802 | if (!flag) { | |
1803 | sprintf(str, "%02x%02x%02x%02x%02x%02x%02x%02x", | |
1804 | *((uint8_t *)kd->kd_addr), | |
1805 | *((uint8_t *)kd->kd_addr + 2), | |
1806 | *((uint8_t *)kd->kd_addr + 4), | |
1807 | *((uint8_t *)kd->kd_addr + 6), | |
1808 | *((uint8_t *)kd->kd_addr + 8), | |
1809 | *((uint8_t *)kd->kd_addr + 10), | |
1810 | *((uint8_t *)kd->kd_addr + 12), | |
1811 | *((uint8_t *)kd->kd_addr + 14)); | |
1812 | } | |
1813 | ||
1814 | return str; | |
1815 | } | |
1816 | ||
a1502d76 | 1817 | static int |
1818 | spl_kmem_init_tracking(struct list_head *list, spinlock_t *lock, int size) | |
1819 | { | |
1820 | int i; | |
1821 | ENTRY; | |
1822 | ||
1823 | spin_lock_init(lock); | |
1824 | INIT_LIST_HEAD(list); | |
1825 | ||
1826 | for (i = 0; i < size; i++) | |
1827 | INIT_HLIST_HEAD(&kmem_table[i]); | |
1828 | ||
1829 | RETURN(0); | |
1830 | } | |
1831 | ||
ff449ac4 | 1832 | static void |
1833 | spl_kmem_fini_tracking(struct list_head *list, spinlock_t *lock) | |
5d86345d | 1834 | { |
2fb9b26a | 1835 | unsigned long flags; |
1836 | kmem_debug_t *kd; | |
1837 | char str[17]; | |
a1502d76 | 1838 | ENTRY; |
2fb9b26a | 1839 | |
ff449ac4 | 1840 | spin_lock_irqsave(lock, flags); |
1841 | if (!list_empty(list)) | |
a0f6da3d | 1842 | printk(KERN_WARNING "%-16s %-5s %-16s %s:%s\n", "address", |
1843 | "size", "data", "func", "line"); | |
2fb9b26a | 1844 | |
ff449ac4 | 1845 | list_for_each_entry(kd, list, kd_list) |
a0f6da3d | 1846 | printk(KERN_WARNING "%p %-5d %-16s %s:%d\n", kd->kd_addr, |
b6b2acc6 | 1847 | (int)kd->kd_size, spl_sprintf_addr(kd, str, 17, 8), |
2fb9b26a | 1848 | kd->kd_func, kd->kd_line); |
1849 | ||
ff449ac4 | 1850 | spin_unlock_irqrestore(lock, flags); |
a1502d76 | 1851 | EXIT; |
ff449ac4 | 1852 | } |
1853 | #else /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */ | |
a1502d76 | 1854 | #define spl_kmem_init_tracking(list, lock, size) |
ff449ac4 | 1855 | #define spl_kmem_fini_tracking(list, lock) |
1856 | #endif /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */ | |
1857 | ||
36b313da BB |
1858 | static void |
1859 | spl_kmem_init_globals(void) | |
1860 | { | |
1861 | struct zone *zone; | |
1862 | ||
1863 | /* For now all zones are includes, it may be wise to restrict | |
1864 | * this to normal and highmem zones if we see problems. */ | |
1865 | for_each_zone(zone) { | |
1866 | ||
1867 | if (!populated_zone(zone)) | |
1868 | continue; | |
1869 | ||
baf2979e BB |
1870 | minfree += min_wmark_pages(zone); |
1871 | desfree += low_wmark_pages(zone); | |
1872 | lotsfree += high_wmark_pages(zone); | |
36b313da | 1873 | } |
4ab13d3b BB |
1874 | |
1875 | /* Solaris default values */ | |
96dded38 BB |
1876 | swapfs_minfree = MAX(2*1024*1024 >> PAGE_SHIFT, physmem >> 3); |
1877 | swapfs_reserve = MIN(4*1024*1024 >> PAGE_SHIFT, physmem >> 4); | |
36b313da BB |
1878 | } |
1879 | ||
d1ff2312 BB |
1880 | /* |
1881 | * Called at module init when it is safe to use spl_kallsyms_lookup_name() | |
1882 | */ | |
1883 | int | |
1884 | spl_kmem_init_kallsyms_lookup(void) | |
1885 | { | |
1886 | #ifndef HAVE_GET_VMALLOC_INFO | |
1887 | get_vmalloc_info_fn = (get_vmalloc_info_t) | |
1888 | spl_kallsyms_lookup_name("get_vmalloc_info"); | |
e11d6c5f BB |
1889 | if (!get_vmalloc_info_fn) { |
1890 | printk(KERN_ERR "Error: Unknown symbol get_vmalloc_info\n"); | |
d1ff2312 | 1891 | return -EFAULT; |
e11d6c5f | 1892 | } |
d1ff2312 BB |
1893 | #endif /* HAVE_GET_VMALLOC_INFO */ |
1894 | ||
5232d256 BB |
1895 | #ifdef HAVE_PGDAT_HELPERS |
1896 | # ifndef HAVE_FIRST_ONLINE_PGDAT | |
d1ff2312 BB |
1897 | first_online_pgdat_fn = (first_online_pgdat_t) |
1898 | spl_kallsyms_lookup_name("first_online_pgdat"); | |
e11d6c5f BB |
1899 | if (!first_online_pgdat_fn) { |
1900 | printk(KERN_ERR "Error: Unknown symbol first_online_pgdat\n"); | |
d1ff2312 | 1901 | return -EFAULT; |
e11d6c5f | 1902 | } |
5232d256 | 1903 | # endif /* HAVE_FIRST_ONLINE_PGDAT */ |
d1ff2312 | 1904 | |
5232d256 | 1905 | # ifndef HAVE_NEXT_ONLINE_PGDAT |
d1ff2312 BB |
1906 | next_online_pgdat_fn = (next_online_pgdat_t) |
1907 | spl_kallsyms_lookup_name("next_online_pgdat"); | |
e11d6c5f BB |
1908 | if (!next_online_pgdat_fn) { |
1909 | printk(KERN_ERR "Error: Unknown symbol next_online_pgdat\n"); | |
d1ff2312 | 1910 | return -EFAULT; |
e11d6c5f | 1911 | } |
5232d256 | 1912 | # endif /* HAVE_NEXT_ONLINE_PGDAT */ |
d1ff2312 | 1913 | |
5232d256 | 1914 | # ifndef HAVE_NEXT_ZONE |
d1ff2312 BB |
1915 | next_zone_fn = (next_zone_t) |
1916 | spl_kallsyms_lookup_name("next_zone"); | |
e11d6c5f BB |
1917 | if (!next_zone_fn) { |
1918 | printk(KERN_ERR "Error: Unknown symbol next_zone\n"); | |
d1ff2312 | 1919 | return -EFAULT; |
e11d6c5f | 1920 | } |
5232d256 BB |
1921 | # endif /* HAVE_NEXT_ZONE */ |
1922 | ||
1923 | #else /* HAVE_PGDAT_HELPERS */ | |
1924 | ||
1925 | # ifndef HAVE_PGDAT_LIST | |
124ca8a5 | 1926 | pgdat_list_addr = *(struct pglist_data **) |
5232d256 BB |
1927 | spl_kallsyms_lookup_name("pgdat_list"); |
1928 | if (!pgdat_list_addr) { | |
1929 | printk(KERN_ERR "Error: Unknown symbol pgdat_list\n"); | |
1930 | return -EFAULT; | |
1931 | } | |
1932 | # endif /* HAVE_PGDAT_LIST */ | |
1933 | #endif /* HAVE_PGDAT_HELPERS */ | |
d1ff2312 | 1934 | |
6ae7fef5 | 1935 | #if defined(NEED_GET_ZONE_COUNTS) && !defined(HAVE_GET_ZONE_COUNTS) |
d1ff2312 BB |
1936 | get_zone_counts_fn = (get_zone_counts_t) |
1937 | spl_kallsyms_lookup_name("get_zone_counts"); | |
e11d6c5f BB |
1938 | if (!get_zone_counts_fn) { |
1939 | printk(KERN_ERR "Error: Unknown symbol get_zone_counts\n"); | |
d1ff2312 | 1940 | return -EFAULT; |
e11d6c5f | 1941 | } |
6ae7fef5 | 1942 | #endif /* NEED_GET_ZONE_COUNTS && !HAVE_GET_ZONE_COUNTS */ |
d1ff2312 BB |
1943 | |
1944 | /* | |
1945 | * It is now safe to initialize the global tunings which rely on | |
1946 | * the use of the for_each_zone() macro. This macro in turns | |
1947 | * depends on the *_pgdat symbols which are now available. | |
1948 | */ | |
1949 | spl_kmem_init_globals(); | |
1950 | ||
1951 | return 0; | |
1952 | } | |
1953 | ||
a1502d76 | 1954 | int |
1955 | spl_kmem_init(void) | |
1956 | { | |
1957 | int rc = 0; | |
1958 | ENTRY; | |
1959 | ||
1960 | init_rwsem(&spl_kmem_cache_sem); | |
1961 | INIT_LIST_HEAD(&spl_kmem_cache_list); | |
1962 | ||
1963 | #ifdef HAVE_SET_SHRINKER | |
1964 | spl_kmem_cache_shrinker = set_shrinker(KMC_DEFAULT_SEEKS, | |
1965 | spl_kmem_cache_generic_shrinker); | |
1966 | if (spl_kmem_cache_shrinker == NULL) | |
f78a933f | 1967 | RETURN(rc = -ENOMEM); |
a1502d76 | 1968 | #else |
1969 | register_shrinker(&spl_kmem_cache_shrinker); | |
1970 | #endif | |
1971 | ||
1972 | #ifdef DEBUG_KMEM | |
d04c8a56 BB |
1973 | kmem_alloc_used_set(0); |
1974 | vmem_alloc_used_set(0); | |
a1502d76 | 1975 | |
1976 | spl_kmem_init_tracking(&kmem_list, &kmem_lock, KMEM_TABLE_SIZE); | |
1977 | spl_kmem_init_tracking(&vmem_list, &vmem_lock, VMEM_TABLE_SIZE); | |
1978 | #endif | |
a1502d76 | 1979 | RETURN(rc); |
1980 | } | |
1981 | ||
ff449ac4 | 1982 | void |
1983 | spl_kmem_fini(void) | |
1984 | { | |
1985 | #ifdef DEBUG_KMEM | |
1986 | /* Display all unreclaimed memory addresses, including the | |
1987 | * allocation size and the first few bytes of what's located | |
1988 | * at that address to aid in debugging. Performance is not | |
1989 | * a serious concern here since it is module unload time. */ | |
d04c8a56 | 1990 | if (kmem_alloc_used_read() != 0) |
ff449ac4 | 1991 | CWARN("kmem leaked %ld/%ld bytes\n", |
d04c8a56 | 1992 | kmem_alloc_used_read(), kmem_alloc_max); |
ff449ac4 | 1993 | |
2fb9b26a | 1994 | |
d04c8a56 | 1995 | if (vmem_alloc_used_read() != 0) |
2fb9b26a | 1996 | CWARN("vmem leaked %ld/%ld bytes\n", |
d04c8a56 | 1997 | vmem_alloc_used_read(), vmem_alloc_max); |
2fb9b26a | 1998 | |
ff449ac4 | 1999 | spl_kmem_fini_tracking(&kmem_list, &kmem_lock); |
2000 | spl_kmem_fini_tracking(&vmem_list, &vmem_lock); | |
2001 | #endif /* DEBUG_KMEM */ | |
2fb9b26a | 2002 | ENTRY; |
2003 | ||
2004 | #ifdef HAVE_SET_SHRINKER | |
2005 | remove_shrinker(spl_kmem_cache_shrinker); | |
2006 | #else | |
2007 | unregister_shrinker(&spl_kmem_cache_shrinker); | |
5d86345d | 2008 | #endif |
2fb9b26a | 2009 | |
937879f1 | 2010 | EXIT; |
5d86345d | 2011 | } |