]>
Commit | Line | Data |
---|---|---|
715f6251 BB |
1 | /* |
2 | * This file is part of the SPL: Solaris Porting Layer. | |
3 | * | |
4 | * Copyright (c) 2008 Lawrence Livermore National Security, LLC. | |
5 | * Produced at Lawrence Livermore National Laboratory | |
6 | * Written by: | |
7 | * Brian Behlendorf <behlendorf1@llnl.gov>, | |
8 | * Herb Wartens <wartens2@llnl.gov>, | |
9 | * Jim Garlick <garlick@llnl.gov> | |
10 | * UCRL-CODE-235197 | |
11 | * | |
12 | * This is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This is distributed in the hope that it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
25 | */ | |
26 | ||
f4b37741 | 27 | #include <sys/kmem.h> |
f1ca4da6 | 28 | |
937879f1 | 29 | #ifdef DEBUG_SUBSYSTEM |
a0f6da3d | 30 | # undef DEBUG_SUBSYSTEM |
937879f1 BB |
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 | ||
36b313da | 87 | #ifndef HAVE_FIRST_ONLINE_PGDAT |
96dded38 | 88 | first_online_pgdat_t first_online_pgdat_fn = SYMBOL_POISON; |
d1ff2312 | 89 | EXPORT_SYMBOL(first_online_pgdat_fn); |
36b313da BB |
90 | #endif /* HAVE_FIRST_ONLINE_PGDAT */ |
91 | ||
92 | #ifndef HAVE_NEXT_ONLINE_PGDAT | |
96dded38 | 93 | next_online_pgdat_t next_online_pgdat_fn = SYMBOL_POISON; |
d1ff2312 | 94 | EXPORT_SYMBOL(next_online_pgdat_fn); |
36b313da BB |
95 | #endif /* HAVE_NEXT_ONLINE_PGDAT */ |
96 | ||
97 | #ifndef HAVE_NEXT_ZONE | |
96dded38 | 98 | next_zone_t next_zone_fn = SYMBOL_POISON; |
d1ff2312 | 99 | EXPORT_SYMBOL(next_zone_fn); |
36b313da BB |
100 | #endif /* HAVE_NEXT_ZONE */ |
101 | ||
e11d6c5f BB |
102 | #ifndef HAVE_ZONE_STAT_ITEM_FIA |
103 | # ifndef HAVE_GET_ZONE_COUNTS | |
96dded38 | 104 | get_zone_counts_t get_zone_counts_fn = SYMBOL_POISON; |
d1ff2312 | 105 | EXPORT_SYMBOL(get_zone_counts_fn); |
96dded38 | 106 | # endif /* HAVE_GET_ZONE_COUNTS */ |
4ab13d3b | 107 | |
e11d6c5f BB |
108 | unsigned long |
109 | spl_global_page_state(int item) | |
4ab13d3b BB |
110 | { |
111 | unsigned long active; | |
112 | unsigned long inactive; | |
113 | unsigned long free; | |
114 | ||
e11d6c5f BB |
115 | if (item == NR_FREE_PAGES) { |
116 | get_zone_counts(&active, &inactive, &free); | |
117 | return free; | |
118 | } | |
119 | ||
120 | if (item == NR_INACTIVE) { | |
121 | get_zone_counts(&active, &inactive, &free); | |
122 | return inactive; | |
123 | } | |
124 | ||
125 | if (item == NR_ACTIVE) { | |
126 | get_zone_counts(&active, &inactive, &free); | |
127 | return active; | |
128 | } | |
129 | ||
96dded38 | 130 | # ifdef HAVE_GLOBAL_PAGE_STATE |
e11d6c5f | 131 | return global_page_state((enum zone_stat_item)item); |
96dded38 BB |
132 | # else |
133 | return 0; /* Unsupported */ | |
134 | # endif /* HAVE_GLOBAL_PAGE_STATE */ | |
e11d6c5f BB |
135 | } |
136 | EXPORT_SYMBOL(spl_global_page_state); | |
e11d6c5f | 137 | #endif /* HAVE_ZONE_STAT_ITEM_FIA */ |
4ab13d3b | 138 | |
e11d6c5f BB |
139 | pgcnt_t |
140 | spl_kmem_availrmem(void) | |
141 | { | |
4ab13d3b | 142 | /* The amount of easily available memory */ |
e11d6c5f BB |
143 | return (spl_global_page_state(NR_FREE_PAGES) + |
144 | spl_global_page_state(NR_INACTIVE)); | |
4ab13d3b BB |
145 | } |
146 | EXPORT_SYMBOL(spl_kmem_availrmem); | |
147 | ||
148 | size_t | |
149 | vmem_size(vmem_t *vmp, int typemask) | |
150 | { | |
d1ff2312 BB |
151 | struct vmalloc_info vmi; |
152 | size_t size = 0; | |
153 | ||
4ab13d3b BB |
154 | ASSERT(vmp == NULL); |
155 | ASSERT(typemask & (VMEM_ALLOC | VMEM_FREE)); | |
156 | ||
d1ff2312 BB |
157 | get_vmalloc_info(&vmi); |
158 | if (typemask & VMEM_ALLOC) | |
159 | size += (size_t)vmi.used; | |
160 | ||
161 | if (typemask & VMEM_FREE) | |
162 | size += (size_t)(VMALLOC_TOTAL - vmi.used); | |
163 | ||
164 | return size; | |
4ab13d3b BB |
165 | } |
166 | EXPORT_SYMBOL(vmem_size); | |
4ab13d3b | 167 | |
f1ca4da6 | 168 | /* |
2fb9b26a BB |
169 | * Memory allocation interfaces and debugging for basic kmem_* |
170 | * and vmem_* style memory allocation. When DEBUG_KMEM is enable | |
171 | * all allocations will be tracked when they are allocated and | |
172 | * freed. When the SPL module is unload a list of all leaked | |
173 | * addresses and where they were allocated will be dumped to the | |
174 | * console. Enabling this feature has a significant impant on | |
175 | * performance but it makes finding memory leaks staight forward. | |
f1ca4da6 BB |
176 | */ |
177 | #ifdef DEBUG_KMEM | |
178 | /* Shim layer memory accounting */ | |
550f1705 | 179 | atomic64_t kmem_alloc_used = ATOMIC64_INIT(0); |
a0f6da3d | 180 | unsigned long long kmem_alloc_max = 0; |
550f1705 | 181 | atomic64_t vmem_alloc_used = ATOMIC64_INIT(0); |
a0f6da3d | 182 | unsigned long long vmem_alloc_max = 0; |
c19c06f3 | 183 | int kmem_warning_flag = 1; |
79b31f36 | 184 | |
ff449ac4 BB |
185 | EXPORT_SYMBOL(kmem_alloc_used); |
186 | EXPORT_SYMBOL(kmem_alloc_max); | |
187 | EXPORT_SYMBOL(vmem_alloc_used); | |
188 | EXPORT_SYMBOL(vmem_alloc_max); | |
189 | EXPORT_SYMBOL(kmem_warning_flag); | |
190 | ||
a0f6da3d BB |
191 | # ifdef DEBUG_KMEM_TRACKING |
192 | ||
193 | /* XXX - Not to surprisingly with debugging enabled the xmem_locks are very | |
194 | * highly contended particularly on xfree(). If we want to run with this | |
195 | * detailed debugging enabled for anything other than debugging we need to | |
196 | * minimize the contention by moving to a lock per xmem_table entry model. | |
197 | */ | |
198 | ||
199 | # define KMEM_HASH_BITS 10 | |
200 | # define KMEM_TABLE_SIZE (1 << KMEM_HASH_BITS) | |
201 | ||
202 | # define VMEM_HASH_BITS 10 | |
203 | # define VMEM_TABLE_SIZE (1 << VMEM_HASH_BITS) | |
204 | ||
205 | typedef struct kmem_debug { | |
206 | struct hlist_node kd_hlist; /* Hash node linkage */ | |
207 | struct list_head kd_list; /* List of all allocations */ | |
208 | void *kd_addr; /* Allocation pointer */ | |
209 | size_t kd_size; /* Allocation size */ | |
210 | const char *kd_func; /* Allocation function */ | |
211 | int kd_line; /* Allocation line */ | |
212 | } kmem_debug_t; | |
213 | ||
d6a26c6a BB |
214 | spinlock_t kmem_lock; |
215 | struct hlist_head kmem_table[KMEM_TABLE_SIZE]; | |
216 | struct list_head kmem_list; | |
217 | ||
13cdca65 BB |
218 | spinlock_t vmem_lock; |
219 | struct hlist_head vmem_table[VMEM_TABLE_SIZE]; | |
220 | struct list_head vmem_list; | |
221 | ||
d6a26c6a BB |
222 | EXPORT_SYMBOL(kmem_lock); |
223 | EXPORT_SYMBOL(kmem_table); | |
224 | EXPORT_SYMBOL(kmem_list); | |
225 | ||
13cdca65 BB |
226 | EXPORT_SYMBOL(vmem_lock); |
227 | EXPORT_SYMBOL(vmem_table); | |
228 | EXPORT_SYMBOL(vmem_list); | |
a0f6da3d | 229 | # endif |
13cdca65 | 230 | |
c19c06f3 BB |
231 | int kmem_set_warning(int flag) { return (kmem_warning_flag = !!flag); } |
232 | #else | |
233 | int kmem_set_warning(int flag) { return 0; } | |
f1ca4da6 | 234 | #endif |
c19c06f3 | 235 | EXPORT_SYMBOL(kmem_set_warning); |
f1ca4da6 BB |
236 | |
237 | /* | |
238 | * Slab allocation interfaces | |
239 | * | |
2fb9b26a BB |
240 | * While the Linux slab implementation was inspired by the Solaris |
241 | * implemenation I cannot use it to emulate the Solaris APIs. I | |
242 | * require two features which are not provided by the Linux slab. | |
243 | * | |
244 | * 1) Constructors AND destructors. Recent versions of the Linux | |
245 | * kernel have removed support for destructors. This is a deal | |
246 | * breaker for the SPL which contains particularly expensive | |
247 | * initializers for mutex's, condition variables, etc. We also | |
a0f6da3d BB |
248 | * require a minimal level of cleanup for these data types unlike |
249 | * many Linux data type which do need to be explicitly destroyed. | |
2fb9b26a | 250 | * |
a0f6da3d | 251 | * 2) Virtual address space backed slab. Callers of the Solaris slab |
2fb9b26a BB |
252 | * expect it to work well for both small are very large allocations. |
253 | * Because of memory fragmentation the Linux slab which is backed | |
254 | * by kmalloc'ed memory performs very badly when confronted with | |
255 | * large numbers of large allocations. Basing the slab on the | |
256 | * virtual address space removes the need for contigeous pages | |
257 | * and greatly improve performance for large allocations. | |
258 | * | |
259 | * For these reasons, the SPL has its own slab implementation with | |
260 | * the needed features. It is not as highly optimized as either the | |
261 | * Solaris or Linux slabs, but it should get me most of what is | |
262 | * needed until it can be optimized or obsoleted by another approach. | |
263 | * | |
264 | * One serious concern I do have about this method is the relatively | |
265 | * small virtual address space on 32bit arches. This will seriously | |
266 | * constrain the size of the slab caches and their performance. | |
267 | * | |
2fb9b26a BB |
268 | * XXX: Improve the partial slab list by carefully maintaining a |
269 | * strict ordering of fullest to emptiest slabs based on | |
270 | * the slab reference count. This gaurentees the when freeing | |
271 | * slabs back to the system we need only linearly traverse the | |
272 | * last N slabs in the list to discover all the freeable slabs. | |
273 | * | |
274 | * XXX: NUMA awareness for optionally allocating memory close to a | |
275 | * particular core. This can be adventageous if you know the slab | |
276 | * object will be short lived and primarily accessed from one core. | |
277 | * | |
278 | * XXX: Slab coloring may also yield performance improvements and would | |
279 | * be desirable to implement. | |
f1ca4da6 | 280 | */ |
2fb9b26a | 281 | |
a0f6da3d BB |
282 | struct list_head spl_kmem_cache_list; /* List of caches */ |
283 | struct rw_semaphore spl_kmem_cache_sem; /* Cache list lock */ | |
c30df9c8 | 284 | |
4afaaefa | 285 | static int spl_cache_flush(spl_kmem_cache_t *skc, |
a0f6da3d | 286 | spl_kmem_magazine_t *skm, int flush); |
4afaaefa | 287 | |
57d86234 | 288 | #ifdef HAVE_SET_SHRINKER |
2fb9b26a | 289 | static struct shrinker *spl_kmem_cache_shrinker; |
57d86234 | 290 | #else |
4afaaefa | 291 | static int spl_kmem_cache_generic_shrinker(int nr_to_scan, |
a0f6da3d | 292 | unsigned int gfp_mask); |
2fb9b26a | 293 | static struct shrinker spl_kmem_cache_shrinker = { |
4afaaefa | 294 | .shrink = spl_kmem_cache_generic_shrinker, |
57d86234 BB |
295 | .seeks = KMC_DEFAULT_SEEKS, |
296 | }; | |
297 | #endif | |
f1ca4da6 | 298 | |
a0f6da3d BB |
299 | #ifdef DEBUG_KMEM |
300 | # ifdef DEBUG_KMEM_TRACKING | |
301 | ||
302 | static kmem_debug_t * | |
303 | kmem_del_init(spinlock_t *lock, struct hlist_head *table, int bits, | |
304 | void *addr) | |
305 | { | |
306 | struct hlist_head *head; | |
307 | struct hlist_node *node; | |
308 | struct kmem_debug *p; | |
309 | unsigned long flags; | |
310 | ENTRY; | |
311 | ||
312 | spin_lock_irqsave(lock, flags); | |
313 | ||
314 | head = &table[hash_ptr(addr, bits)]; | |
315 | hlist_for_each_entry_rcu(p, node, head, kd_hlist) { | |
316 | if (p->kd_addr == addr) { | |
317 | hlist_del_init(&p->kd_hlist); | |
318 | list_del_init(&p->kd_list); | |
319 | spin_unlock_irqrestore(lock, flags); | |
320 | return p; | |
321 | } | |
322 | } | |
323 | ||
324 | spin_unlock_irqrestore(lock, flags); | |
325 | ||
326 | RETURN(NULL); | |
327 | } | |
328 | ||
329 | void * | |
330 | kmem_alloc_track(size_t size, int flags, const char *func, int line, | |
331 | int node_alloc, int node) | |
332 | { | |
333 | void *ptr = NULL; | |
334 | kmem_debug_t *dptr; | |
335 | unsigned long irq_flags; | |
336 | ENTRY; | |
337 | ||
338 | dptr = (kmem_debug_t *) kmalloc(sizeof(kmem_debug_t), | |
339 | flags & ~__GFP_ZERO); | |
340 | ||
341 | if (dptr == NULL) { | |
342 | CWARN("kmem_alloc(%ld, 0x%x) debug failed\n", | |
343 | sizeof(kmem_debug_t), flags); | |
344 | } else { | |
345 | /* Marked unlikely because we should never be doing this, | |
346 | * we tolerate to up 2 pages but a single page is best. */ | |
347 | if (unlikely((size) > (PAGE_SIZE * 2)) && kmem_warning_flag) | |
348 | CWARN("Large kmem_alloc(%llu, 0x%x) (%lld/%llu)\n", | |
349 | (unsigned long long) size, flags, | |
350 | atomic64_read(&kmem_alloc_used), kmem_alloc_max); | |
351 | ||
c8e60837 BB |
352 | /* We use kstrdup() below because the string pointed to by |
353 | * __FUNCTION__ might not be available by the time we want | |
354 | * to print it since the module might have been unloaded. */ | |
355 | dptr->kd_func = kstrdup(func, flags & ~__GFP_ZERO); | |
356 | if (unlikely(dptr->kd_func == NULL)) { | |
357 | kfree(dptr); | |
358 | CWARN("kstrdup() failed in kmem_alloc(%llu, 0x%x) " | |
359 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
360 | atomic64_read(&kmem_alloc_used), kmem_alloc_max); | |
361 | goto out; | |
362 | } | |
363 | ||
a0f6da3d BB |
364 | /* Use the correct allocator */ |
365 | if (node_alloc) { | |
366 | ASSERT(!(flags & __GFP_ZERO)); | |
367 | ptr = kmalloc_node(size, flags, node); | |
368 | } else if (flags & __GFP_ZERO) { | |
369 | ptr = kzalloc(size, flags & ~__GFP_ZERO); | |
370 | } else { | |
371 | ptr = kmalloc(size, flags); | |
372 | } | |
373 | ||
374 | if (unlikely(ptr == NULL)) { | |
c8e60837 | 375 | kfree(dptr->kd_func); |
a0f6da3d BB |
376 | kfree(dptr); |
377 | CWARN("kmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
378 | (unsigned long long) size, flags, | |
379 | atomic64_read(&kmem_alloc_used), kmem_alloc_max); | |
380 | goto out; | |
381 | } | |
382 | ||
383 | atomic64_add(size, &kmem_alloc_used); | |
384 | if (unlikely(atomic64_read(&kmem_alloc_used) > | |
385 | kmem_alloc_max)) | |
386 | kmem_alloc_max = | |
387 | atomic64_read(&kmem_alloc_used); | |
388 | ||
389 | INIT_HLIST_NODE(&dptr->kd_hlist); | |
390 | INIT_LIST_HEAD(&dptr->kd_list); | |
391 | ||
392 | dptr->kd_addr = ptr; | |
393 | dptr->kd_size = size; | |
a0f6da3d BB |
394 | dptr->kd_line = line; |
395 | ||
396 | spin_lock_irqsave(&kmem_lock, irq_flags); | |
397 | hlist_add_head_rcu(&dptr->kd_hlist, | |
398 | &kmem_table[hash_ptr(ptr, KMEM_HASH_BITS)]); | |
399 | list_add_tail(&dptr->kd_list, &kmem_list); | |
400 | spin_unlock_irqrestore(&kmem_lock, irq_flags); | |
401 | ||
402 | CDEBUG_LIMIT(D_INFO, "kmem_alloc(%llu, 0x%x) = %p " | |
403 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
404 | ptr, atomic64_read(&kmem_alloc_used), | |
405 | kmem_alloc_max); | |
406 | } | |
407 | out: | |
408 | RETURN(ptr); | |
409 | } | |
410 | EXPORT_SYMBOL(kmem_alloc_track); | |
411 | ||
412 | void | |
413 | kmem_free_track(void *ptr, size_t size) | |
414 | { | |
415 | kmem_debug_t *dptr; | |
416 | ENTRY; | |
417 | ||
418 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
419 | (unsigned long long) size); | |
420 | ||
421 | dptr = kmem_del_init(&kmem_lock, kmem_table, KMEM_HASH_BITS, ptr); | |
422 | ||
423 | ASSERT(dptr); /* Must exist in hash due to kmem_alloc() */ | |
424 | ||
425 | /* Size must match */ | |
426 | ASSERTF(dptr->kd_size == size, "kd_size (%llu) != size (%llu), " | |
427 | "kd_func = %s, kd_line = %d\n", (unsigned long long) dptr->kd_size, | |
428 | (unsigned long long) size, dptr->kd_func, dptr->kd_line); | |
429 | ||
430 | atomic64_sub(size, &kmem_alloc_used); | |
431 | ||
432 | CDEBUG_LIMIT(D_INFO, "kmem_free(%p, %llu) (%lld/%llu)\n", ptr, | |
433 | (unsigned long long) size, atomic64_read(&kmem_alloc_used), | |
434 | kmem_alloc_max); | |
435 | ||
c8e60837 BB |
436 | kfree(dptr->kd_func); |
437 | ||
a0f6da3d BB |
438 | memset(dptr, 0x5a, sizeof(kmem_debug_t)); |
439 | kfree(dptr); | |
440 | ||
441 | memset(ptr, 0x5a, size); | |
442 | kfree(ptr); | |
443 | ||
444 | EXIT; | |
445 | } | |
446 | EXPORT_SYMBOL(kmem_free_track); | |
447 | ||
448 | void * | |
449 | vmem_alloc_track(size_t size, int flags, const char *func, int line) | |
450 | { | |
451 | void *ptr = NULL; | |
452 | kmem_debug_t *dptr; | |
453 | unsigned long irq_flags; | |
454 | ENTRY; | |
455 | ||
456 | ASSERT(flags & KM_SLEEP); | |
457 | ||
458 | dptr = (kmem_debug_t *) kmalloc(sizeof(kmem_debug_t), flags); | |
459 | if (dptr == NULL) { | |
460 | CWARN("vmem_alloc(%ld, 0x%x) debug failed\n", | |
461 | sizeof(kmem_debug_t), flags); | |
462 | } else { | |
c8e60837 BB |
463 | /* We use kstrdup() below because the string pointed to by |
464 | * __FUNCTION__ might not be available by the time we want | |
465 | * to print it, since the module might have been unloaded. */ | |
466 | dptr->kd_func = kstrdup(func, flags & ~__GFP_ZERO); | |
467 | if (unlikely(dptr->kd_func == NULL)) { | |
468 | kfree(dptr); | |
469 | CWARN("kstrdup() failed in vmem_alloc(%llu, 0x%x) " | |
470 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
471 | atomic64_read(&vmem_alloc_used), vmem_alloc_max); | |
472 | goto out; | |
473 | } | |
474 | ||
a0f6da3d BB |
475 | ptr = __vmalloc(size, (flags | __GFP_HIGHMEM) & ~__GFP_ZERO, |
476 | PAGE_KERNEL); | |
477 | ||
478 | if (unlikely(ptr == NULL)) { | |
c8e60837 | 479 | kfree(dptr->kd_func); |
a0f6da3d BB |
480 | kfree(dptr); |
481 | CWARN("vmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
482 | (unsigned long long) size, flags, | |
483 | atomic64_read(&vmem_alloc_used), vmem_alloc_max); | |
484 | goto out; | |
485 | } | |
486 | ||
487 | if (flags & __GFP_ZERO) | |
488 | memset(ptr, 0, size); | |
489 | ||
490 | atomic64_add(size, &vmem_alloc_used); | |
491 | if (unlikely(atomic64_read(&vmem_alloc_used) > | |
492 | vmem_alloc_max)) | |
493 | vmem_alloc_max = | |
494 | atomic64_read(&vmem_alloc_used); | |
495 | ||
496 | INIT_HLIST_NODE(&dptr->kd_hlist); | |
497 | INIT_LIST_HEAD(&dptr->kd_list); | |
498 | ||
499 | dptr->kd_addr = ptr; | |
500 | dptr->kd_size = size; | |
a0f6da3d BB |
501 | dptr->kd_line = line; |
502 | ||
503 | spin_lock_irqsave(&vmem_lock, irq_flags); | |
504 | hlist_add_head_rcu(&dptr->kd_hlist, | |
505 | &vmem_table[hash_ptr(ptr, VMEM_HASH_BITS)]); | |
506 | list_add_tail(&dptr->kd_list, &vmem_list); | |
507 | spin_unlock_irqrestore(&vmem_lock, irq_flags); | |
508 | ||
509 | CDEBUG_LIMIT(D_INFO, "vmem_alloc(%llu, 0x%x) = %p " | |
510 | "(%lld/%llu)\n", (unsigned long long) size, flags, | |
511 | ptr, atomic64_read(&vmem_alloc_used), | |
512 | vmem_alloc_max); | |
513 | } | |
514 | out: | |
515 | RETURN(ptr); | |
516 | } | |
517 | EXPORT_SYMBOL(vmem_alloc_track); | |
518 | ||
519 | void | |
520 | vmem_free_track(void *ptr, size_t size) | |
521 | { | |
522 | kmem_debug_t *dptr; | |
523 | ENTRY; | |
524 | ||
525 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
526 | (unsigned long long) size); | |
527 | ||
528 | dptr = kmem_del_init(&vmem_lock, vmem_table, VMEM_HASH_BITS, ptr); | |
529 | ASSERT(dptr); /* Must exist in hash due to vmem_alloc() */ | |
530 | ||
531 | /* Size must match */ | |
532 | ASSERTF(dptr->kd_size == size, "kd_size (%llu) != size (%llu), " | |
533 | "kd_func = %s, kd_line = %d\n", (unsigned long long) dptr->kd_size, | |
534 | (unsigned long long) size, dptr->kd_func, dptr->kd_line); | |
535 | ||
536 | atomic64_sub(size, &vmem_alloc_used); | |
537 | CDEBUG_LIMIT(D_INFO, "vmem_free(%p, %llu) (%lld/%llu)\n", ptr, | |
538 | (unsigned long long) size, atomic64_read(&vmem_alloc_used), | |
539 | vmem_alloc_max); | |
540 | ||
c8e60837 BB |
541 | kfree(dptr->kd_func); |
542 | ||
a0f6da3d BB |
543 | memset(dptr, 0x5a, sizeof(kmem_debug_t)); |
544 | kfree(dptr); | |
545 | ||
546 | memset(ptr, 0x5a, size); | |
547 | vfree(ptr); | |
548 | ||
549 | EXIT; | |
550 | } | |
551 | EXPORT_SYMBOL(vmem_free_track); | |
552 | ||
553 | # else /* DEBUG_KMEM_TRACKING */ | |
554 | ||
555 | void * | |
556 | kmem_alloc_debug(size_t size, int flags, const char *func, int line, | |
557 | int node_alloc, int node) | |
558 | { | |
559 | void *ptr; | |
560 | ENTRY; | |
561 | ||
562 | /* Marked unlikely because we should never be doing this, | |
563 | * we tolerate to up 2 pages but a single page is best. */ | |
564 | if (unlikely(size > (PAGE_SIZE * 2)) && kmem_warning_flag) | |
565 | CWARN("Large kmem_alloc(%llu, 0x%x) (%lld/%llu)\n", | |
566 | (unsigned long long) size, flags, | |
567 | atomic64_read(&kmem_alloc_used), kmem_alloc_max); | |
568 | ||
569 | /* Use the correct allocator */ | |
570 | if (node_alloc) { | |
571 | ASSERT(!(flags & __GFP_ZERO)); | |
572 | ptr = kmalloc_node(size, flags, node); | |
573 | } else if (flags & __GFP_ZERO) { | |
574 | ptr = kzalloc(size, flags & (~__GFP_ZERO)); | |
575 | } else { | |
576 | ptr = kmalloc(size, flags); | |
577 | } | |
578 | ||
579 | if (ptr == NULL) { | |
580 | CWARN("kmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
581 | (unsigned long long) size, flags, | |
582 | atomic64_read(&kmem_alloc_used), kmem_alloc_max); | |
583 | } else { | |
584 | atomic64_add(size, &kmem_alloc_used); | |
585 | if (unlikely(atomic64_read(&kmem_alloc_used) > kmem_alloc_max)) | |
586 | kmem_alloc_max = atomic64_read(&kmem_alloc_used); | |
587 | ||
588 | CDEBUG_LIMIT(D_INFO, "kmem_alloc(%llu, 0x%x) = %p " | |
589 | "(%lld/%llu)\n", (unsigned long long) size, flags, ptr, | |
590 | atomic64_read(&kmem_alloc_used), kmem_alloc_max); | |
591 | } | |
592 | RETURN(ptr); | |
593 | } | |
594 | EXPORT_SYMBOL(kmem_alloc_debug); | |
595 | ||
596 | void | |
597 | kmem_free_debug(void *ptr, size_t size) | |
598 | { | |
599 | ENTRY; | |
600 | ||
601 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
602 | (unsigned long long) size); | |
603 | ||
604 | atomic64_sub(size, &kmem_alloc_used); | |
605 | ||
606 | CDEBUG_LIMIT(D_INFO, "kmem_free(%p, %llu) (%lld/%llu)\n", ptr, | |
607 | (unsigned long long) size, atomic64_read(&kmem_alloc_used), | |
608 | kmem_alloc_max); | |
609 | ||
610 | memset(ptr, 0x5a, size); | |
611 | kfree(ptr); | |
612 | ||
613 | EXIT; | |
614 | } | |
615 | EXPORT_SYMBOL(kmem_free_debug); | |
616 | ||
617 | void * | |
618 | vmem_alloc_debug(size_t size, int flags, const char *func, int line) | |
619 | { | |
620 | void *ptr; | |
621 | ENTRY; | |
622 | ||
623 | ASSERT(flags & KM_SLEEP); | |
624 | ||
625 | ptr = __vmalloc(size, (flags | __GFP_HIGHMEM) & ~__GFP_ZERO, | |
626 | PAGE_KERNEL); | |
627 | if (ptr == NULL) { | |
628 | CWARN("vmem_alloc(%llu, 0x%x) failed (%lld/%llu)\n", | |
629 | (unsigned long long) size, flags, | |
630 | atomic64_read(&vmem_alloc_used), vmem_alloc_max); | |
631 | } else { | |
632 | if (flags & __GFP_ZERO) | |
633 | memset(ptr, 0, size); | |
634 | ||
635 | atomic64_add(size, &vmem_alloc_used); | |
636 | ||
637 | if (unlikely(atomic64_read(&vmem_alloc_used) > vmem_alloc_max)) | |
638 | vmem_alloc_max = atomic64_read(&vmem_alloc_used); | |
639 | ||
640 | CDEBUG_LIMIT(D_INFO, "vmem_alloc(%llu, 0x%x) = %p " | |
641 | "(%lld/%llu)\n", (unsigned long long) size, flags, ptr, | |
642 | atomic64_read(&vmem_alloc_used), vmem_alloc_max); | |
643 | } | |
644 | ||
645 | RETURN(ptr); | |
646 | } | |
647 | EXPORT_SYMBOL(vmem_alloc_debug); | |
648 | ||
649 | void | |
650 | vmem_free_debug(void *ptr, size_t size) | |
651 | { | |
652 | ENTRY; | |
653 | ||
654 | ASSERTF(ptr || size > 0, "ptr: %p, size: %llu", ptr, | |
655 | (unsigned long long) size); | |
656 | ||
657 | atomic64_sub(size, &vmem_alloc_used); | |
658 | ||
659 | CDEBUG_LIMIT(D_INFO, "vmem_free(%p, %llu) (%lld/%llu)\n", ptr, | |
660 | (unsigned long long) size, atomic64_read(&vmem_alloc_used), | |
661 | vmem_alloc_max); | |
662 | ||
663 | memset(ptr, 0x5a, size); | |
664 | vfree(ptr); | |
665 | ||
666 | EXIT; | |
667 | } | |
668 | EXPORT_SYMBOL(vmem_free_debug); | |
669 | ||
670 | # endif /* DEBUG_KMEM_TRACKING */ | |
671 | #endif /* DEBUG_KMEM */ | |
672 | ||
a1502d76 BB |
673 | static void * |
674 | kv_alloc(spl_kmem_cache_t *skc, int size, int flags) | |
fece7c99 | 675 | { |
a1502d76 | 676 | void *ptr; |
f1ca4da6 | 677 | |
a1502d76 BB |
678 | if (skc->skc_flags & KMC_KMEM) { |
679 | if (size > (2 * PAGE_SIZE)) { | |
680 | ptr = (void *)__get_free_pages(flags, get_order(size)); | |
681 | } else | |
682 | ptr = kmem_alloc(size, flags); | |
683 | } else { | |
684 | ptr = vmem_alloc(size, flags); | |
d6a26c6a | 685 | } |
fece7c99 | 686 | |
a1502d76 BB |
687 | return ptr; |
688 | } | |
fece7c99 | 689 | |
a1502d76 BB |
690 | static void |
691 | kv_free(spl_kmem_cache_t *skc, void *ptr, int size) | |
692 | { | |
693 | if (skc->skc_flags & KMC_KMEM) { | |
694 | if (size > (2 * PAGE_SIZE)) | |
695 | free_pages((unsigned long)ptr, get_order(size)); | |
696 | else | |
697 | kmem_free(ptr, size); | |
698 | } else { | |
699 | vmem_free(ptr, size); | |
700 | } | |
fece7c99 BB |
701 | } |
702 | ||
ea3e6ca9 BB |
703 | /* |
704 | * It's important that we pack the spl_kmem_obj_t structure and the | |
48e0606a BB |
705 | * actual objects in to one large address space to minimize the number |
706 | * of calls to the allocator. It is far better to do a few large | |
707 | * allocations and then subdivide it ourselves. Now which allocator | |
708 | * we use requires balancing a few trade offs. | |
709 | * | |
710 | * For small objects we use kmem_alloc() because as long as you are | |
711 | * only requesting a small number of pages (ideally just one) its cheap. | |
712 | * However, when you start requesting multiple pages with kmem_alloc() | |
713 | * it gets increasingly expensive since it requires contigeous pages. | |
714 | * For this reason we shift to vmem_alloc() for slabs of large objects | |
715 | * which removes the need for contigeous pages. We do not use | |
716 | * vmem_alloc() in all cases because there is significant locking | |
717 | * overhead in __get_vm_area_node(). This function takes a single | |
718 | * global lock when aquiring an available virtual address range which | |
719 | * serializes all vmem_alloc()'s for all slab caches. Using slightly | |
720 | * different allocation functions for small and large objects should | |
721 | * give us the best of both worlds. | |
722 | * | |
723 | * KMC_ONSLAB KMC_OFFSLAB | |
724 | * | |
725 | * +------------------------+ +-----------------+ | |
726 | * | spl_kmem_slab_t --+-+ | | spl_kmem_slab_t |---+-+ | |
727 | * | skc_obj_size <-+ | | +-----------------+ | | | |
728 | * | spl_kmem_obj_t | | | | | |
729 | * | skc_obj_size <---+ | +-----------------+ | | | |
730 | * | spl_kmem_obj_t | | | skc_obj_size | <-+ | | |
731 | * | ... v | | spl_kmem_obj_t | | | |
732 | * +------------------------+ +-----------------+ v | |
733 | */ | |
fece7c99 | 734 | static spl_kmem_slab_t * |
a1502d76 | 735 | spl_slab_alloc(spl_kmem_cache_t *skc, int flags) |
fece7c99 BB |
736 | { |
737 | spl_kmem_slab_t *sks; | |
a1502d76 BB |
738 | spl_kmem_obj_t *sko, *n; |
739 | void *base, *obj; | |
48e0606a BB |
740 | int i, align, size, rc = 0; |
741 | ||
a1502d76 BB |
742 | base = kv_alloc(skc, skc->skc_slab_size, flags); |
743 | if (base == NULL) | |
fece7c99 BB |
744 | RETURN(NULL); |
745 | ||
a1502d76 BB |
746 | sks = (spl_kmem_slab_t *)base; |
747 | sks->sks_magic = SKS_MAGIC; | |
748 | sks->sks_objs = skc->skc_slab_objs; | |
749 | sks->sks_age = jiffies; | |
750 | sks->sks_cache = skc; | |
751 | INIT_LIST_HEAD(&sks->sks_list); | |
752 | INIT_LIST_HEAD(&sks->sks_free_list); | |
753 | sks->sks_ref = 0; | |
48e0606a BB |
754 | |
755 | align = skc->skc_obj_align; | |
756 | size = P2ROUNDUP(skc->skc_obj_size, align) + | |
757 | P2ROUNDUP(sizeof(spl_kmem_obj_t), align); | |
fece7c99 BB |
758 | |
759 | for (i = 0; i < sks->sks_objs; i++) { | |
a1502d76 BB |
760 | if (skc->skc_flags & KMC_OFFSLAB) { |
761 | obj = kv_alloc(skc, size, flags); | |
762 | if (!obj) | |
763 | GOTO(out, rc = -ENOMEM); | |
764 | } else { | |
48e0606a BB |
765 | obj = base + |
766 | P2ROUNDUP(sizeof(spl_kmem_slab_t), align) + | |
767 | (i * size); | |
a1502d76 BB |
768 | } |
769 | ||
48e0606a | 770 | sko = obj + P2ROUNDUP(skc->skc_obj_size, align); |
fece7c99 BB |
771 | sko->sko_addr = obj; |
772 | sko->sko_magic = SKO_MAGIC; | |
773 | sko->sko_slab = sks; | |
774 | INIT_LIST_HEAD(&sko->sko_list); | |
fece7c99 BB |
775 | list_add_tail(&sko->sko_list, &sks->sks_free_list); |
776 | } | |
777 | ||
fece7c99 BB |
778 | list_for_each_entry(sko, &sks->sks_free_list, sko_list) |
779 | if (skc->skc_ctor) | |
780 | skc->skc_ctor(sko->sko_addr, skc->skc_private, flags); | |
2fb9b26a | 781 | out: |
a1502d76 BB |
782 | if (rc) { |
783 | if (skc->skc_flags & KMC_OFFSLAB) | |
48e0606a BB |
784 | list_for_each_entry_safe(sko, n, &sks->sks_free_list, |
785 | sko_list) | |
a1502d76 | 786 | kv_free(skc, sko->sko_addr, size); |
fece7c99 | 787 | |
a1502d76 BB |
788 | kv_free(skc, base, skc->skc_slab_size); |
789 | sks = NULL; | |
fece7c99 BB |
790 | } |
791 | ||
a1502d76 | 792 | RETURN(sks); |
fece7c99 BB |
793 | } |
794 | ||
ea3e6ca9 BB |
795 | /* |
796 | * Remove a slab from complete or partial list, it must be called with | |
797 | * the 'skc->skc_lock' held but the actual free must be performed | |
798 | * outside the lock to prevent deadlocking on vmem addresses. | |
fece7c99 | 799 | */ |
f1ca4da6 | 800 | static void |
ea3e6ca9 BB |
801 | spl_slab_free(spl_kmem_slab_t *sks, |
802 | struct list_head *sks_list, struct list_head *sko_list) | |
803 | { | |
2fb9b26a | 804 | spl_kmem_cache_t *skc; |
2fb9b26a | 805 | ENTRY; |
57d86234 | 806 | |
2fb9b26a | 807 | ASSERT(sks->sks_magic == SKS_MAGIC); |
4afaaefa | 808 | ASSERT(sks->sks_ref == 0); |
d6a26c6a | 809 | |
fece7c99 BB |
810 | skc = sks->sks_cache; |
811 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
d46630e0 | 812 | ASSERT(spin_is_locked(&skc->skc_lock)); |
f1ca4da6 | 813 | |
1a944a7d BB |
814 | /* |
815 | * Update slab/objects counters in the cache, then remove the | |
816 | * slab from the skc->skc_partial_list. Finally add the slab | |
817 | * and all its objects in to the private work lists where the | |
818 | * destructors will be called and the memory freed to the system. | |
819 | */ | |
fece7c99 BB |
820 | skc->skc_obj_total -= sks->sks_objs; |
821 | skc->skc_slab_total--; | |
822 | list_del(&sks->sks_list); | |
ea3e6ca9 | 823 | list_add(&sks->sks_list, sks_list); |
1a944a7d BB |
824 | list_splice_init(&sks->sks_free_list, sko_list); |
825 | ||
2fb9b26a BB |
826 | EXIT; |
827 | } | |
d6a26c6a | 828 | |
ea3e6ca9 BB |
829 | /* |
830 | * Traverses all the partial slabs attached to a cache and free those | |
831 | * which which are currently empty, and have not been touched for | |
37db7d8c BB |
832 | * skc_delay seconds to avoid thrashing. The count argument is |
833 | * passed to optionally cap the number of slabs reclaimed, a count | |
834 | * of zero means try and reclaim everything. When flag is set we | |
835 | * always free an available slab regardless of age. | |
ea3e6ca9 BB |
836 | */ |
837 | static void | |
37db7d8c | 838 | spl_slab_reclaim(spl_kmem_cache_t *skc, int count, int flag) |
2fb9b26a BB |
839 | { |
840 | spl_kmem_slab_t *sks, *m; | |
ea3e6ca9 BB |
841 | spl_kmem_obj_t *sko, *n; |
842 | LIST_HEAD(sks_list); | |
843 | LIST_HEAD(sko_list); | |
1a944a7d | 844 | int size = 0, i = 0; |
2fb9b26a BB |
845 | ENTRY; |
846 | ||
2fb9b26a | 847 | /* |
ea3e6ca9 BB |
848 | * Move empty slabs and objects which have not been touched in |
849 | * skc_delay seconds on to private lists to be freed outside | |
1a944a7d BB |
850 | * the spin lock. This delay time is important to avoid thrashing |
851 | * however when flag is set the delay will not be used. | |
2fb9b26a | 852 | */ |
ea3e6ca9 | 853 | spin_lock(&skc->skc_lock); |
1a944a7d BB |
854 | list_for_each_entry_safe_reverse(sks,m,&skc->skc_partial_list,sks_list){ |
855 | /* | |
856 | * All empty slabs are at the end of skc->skc_partial_list, | |
857 | * therefore once a non-empty slab is found we can stop | |
858 | * scanning. Additionally, stop when reaching the target | |
859 | * reclaim 'count' if a non-zero threshhold is given. | |
860 | */ | |
861 | if ((sks->sks_ref > 0) || (count && i > count)) | |
37db7d8c BB |
862 | break; |
863 | ||
37db7d8c | 864 | if (time_after(jiffies,sks->sks_age+skc->skc_delay*HZ)||flag) { |
ea3e6ca9 | 865 | spl_slab_free(sks, &sks_list, &sko_list); |
37db7d8c BB |
866 | i++; |
867 | } | |
ea3e6ca9 BB |
868 | } |
869 | spin_unlock(&skc->skc_lock); | |
870 | ||
871 | /* | |
1a944a7d BB |
872 | * The following two loops ensure all the object destructors are |
873 | * run, any offslab objects are freed, and the slabs themselves | |
874 | * are freed. This is all done outside the skc->skc_lock since | |
875 | * this allows the destructor to sleep, and allows us to perform | |
876 | * a conditional reschedule when a freeing a large number of | |
877 | * objects and slabs back to the system. | |
ea3e6ca9 | 878 | */ |
1a944a7d | 879 | if (skc->skc_flags & KMC_OFFSLAB) |
ea3e6ca9 BB |
880 | size = P2ROUNDUP(skc->skc_obj_size, skc->skc_obj_align) + |
881 | P2ROUNDUP(sizeof(spl_kmem_obj_t), skc->skc_obj_align); | |
882 | ||
1a944a7d BB |
883 | list_for_each_entry_safe(sko, n, &sko_list, sko_list) { |
884 | ASSERT(sko->sko_magic == SKO_MAGIC); | |
885 | ||
886 | if (skc->skc_dtor) | |
887 | skc->skc_dtor(sko->sko_addr, skc->skc_private); | |
888 | ||
889 | if (skc->skc_flags & KMC_OFFSLAB) | |
ea3e6ca9 | 890 | kv_free(skc, sko->sko_addr, size); |
1a944a7d BB |
891 | |
892 | cond_resched(); | |
2fb9b26a BB |
893 | } |
894 | ||
37db7d8c | 895 | list_for_each_entry_safe(sks, m, &sks_list, sks_list) { |
1a944a7d | 896 | ASSERT(sks->sks_magic == SKS_MAGIC); |
ea3e6ca9 | 897 | kv_free(skc, sks, skc->skc_slab_size); |
37db7d8c BB |
898 | cond_resched(); |
899 | } | |
ea3e6ca9 BB |
900 | |
901 | EXIT; | |
f1ca4da6 BB |
902 | } |
903 | ||
ea3e6ca9 BB |
904 | /* |
905 | * Called regularly on all caches to age objects out of the magazines | |
906 | * which have not been access in skc->skc_delay seconds. This prevents | |
907 | * idle magazines from holding memory which might be better used by | |
908 | * other caches or parts of the system. The delay is present to | |
909 | * prevent thrashing the magazine. | |
910 | */ | |
911 | static void | |
912 | spl_magazine_age(void *data) | |
f1ca4da6 | 913 | { |
9b1b8e4c BB |
914 | spl_kmem_magazine_t *skm = |
915 | spl_get_work_data(data, spl_kmem_magazine_t, skm_work.work); | |
916 | spl_kmem_cache_t *skc = skm->skm_cache; | |
917 | int i = smp_processor_id(); | |
918 | ||
919 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
920 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
921 | ASSERT(skc->skc_mag[i] == skm); | |
f1ca4da6 | 922 | |
ea3e6ca9 BB |
923 | if (skm->skm_avail > 0 && |
924 | time_after(jiffies, skm->skm_age + skc->skc_delay * HZ)) | |
925 | (void)spl_cache_flush(skc, skm, skm->skm_refill); | |
9b1b8e4c BB |
926 | |
927 | if (!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)) | |
928 | schedule_delayed_work_on(i, &skm->skm_work, | |
929 | skc->skc_delay / 3 * HZ); | |
ea3e6ca9 | 930 | } |
4efd4118 | 931 | |
ea3e6ca9 BB |
932 | /* |
933 | * Called regularly to keep a downward pressure on the size of idle | |
934 | * magazines and to release free slabs from the cache. This function | |
935 | * never calls the registered reclaim function, that only occures | |
936 | * under memory pressure or with a direct call to spl_kmem_reap(). | |
937 | */ | |
938 | static void | |
939 | spl_cache_age(void *data) | |
940 | { | |
9b1b8e4c | 941 | spl_kmem_cache_t *skc = |
ea3e6ca9 BB |
942 | spl_get_work_data(data, spl_kmem_cache_t, skc_work.work); |
943 | ||
944 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
37db7d8c | 945 | spl_slab_reclaim(skc, skc->skc_reap, 0); |
ea3e6ca9 BB |
946 | |
947 | if (!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)) | |
37db7d8c | 948 | schedule_delayed_work(&skc->skc_work, skc->skc_delay / 3 * HZ); |
2fb9b26a | 949 | } |
f1ca4da6 | 950 | |
ea3e6ca9 BB |
951 | /* |
952 | * Size a slab based on the size of each aliged object plus spl_kmem_obj_t. | |
953 | * When on-slab we want to target SPL_KMEM_CACHE_OBJ_PER_SLAB. However, | |
954 | * for very small objects we may end up with more than this so as not | |
955 | * to waste space in the minimal allocation of a single page. Also for | |
956 | * very large objects we may use as few as SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN, | |
957 | * lower than this and we will fail. | |
958 | */ | |
48e0606a BB |
959 | static int |
960 | spl_slab_size(spl_kmem_cache_t *skc, uint32_t *objs, uint32_t *size) | |
961 | { | |
ea3e6ca9 | 962 | int sks_size, obj_size, max_size, align; |
48e0606a BB |
963 | |
964 | if (skc->skc_flags & KMC_OFFSLAB) { | |
ea3e6ca9 | 965 | *objs = SPL_KMEM_CACHE_OBJ_PER_SLAB; |
48e0606a BB |
966 | *size = sizeof(spl_kmem_slab_t); |
967 | } else { | |
ea3e6ca9 BB |
968 | align = skc->skc_obj_align; |
969 | sks_size = P2ROUNDUP(sizeof(spl_kmem_slab_t), align); | |
970 | obj_size = P2ROUNDUP(skc->skc_obj_size, align) + | |
971 | P2ROUNDUP(sizeof(spl_kmem_obj_t), align); | |
972 | ||
973 | if (skc->skc_flags & KMC_KMEM) | |
974 | max_size = ((uint64_t)1 << (MAX_ORDER-1)) * PAGE_SIZE; | |
975 | else | |
976 | max_size = (32 * 1024 * 1024); | |
48e0606a | 977 | |
ea3e6ca9 BB |
978 | for (*size = PAGE_SIZE; *size <= max_size; *size += PAGE_SIZE) { |
979 | *objs = (*size - sks_size) / obj_size; | |
980 | if (*objs >= SPL_KMEM_CACHE_OBJ_PER_SLAB) | |
981 | RETURN(0); | |
982 | } | |
48e0606a | 983 | |
ea3e6ca9 BB |
984 | /* |
985 | * Unable to satisfy target objets per slab, fallback to | |
986 | * allocating a maximally sized slab and assuming it can | |
987 | * contain the minimum objects count use it. If not fail. | |
988 | */ | |
989 | *size = max_size; | |
990 | *objs = (*size - sks_size) / obj_size; | |
991 | if (*objs >= SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN) | |
992 | RETURN(0); | |
48e0606a BB |
993 | } |
994 | ||
ea3e6ca9 | 995 | RETURN(-ENOSPC); |
48e0606a BB |
996 | } |
997 | ||
ea3e6ca9 BB |
998 | /* |
999 | * Make a guess at reasonable per-cpu magazine size based on the size of | |
1000 | * each object and the cost of caching N of them in each magazine. Long | |
1001 | * term this should really adapt based on an observed usage heuristic. | |
1002 | */ | |
4afaaefa BB |
1003 | static int |
1004 | spl_magazine_size(spl_kmem_cache_t *skc) | |
1005 | { | |
48e0606a | 1006 | int size, align = skc->skc_obj_align; |
4afaaefa BB |
1007 | ENTRY; |
1008 | ||
ea3e6ca9 | 1009 | /* Per-magazine sizes below assume a 4Kib page size */ |
48e0606a | 1010 | if (P2ROUNDUP(skc->skc_obj_size, align) > (PAGE_SIZE * 256)) |
ea3e6ca9 | 1011 | size = 4; /* Minimum 4Mib per-magazine */ |
48e0606a | 1012 | else if (P2ROUNDUP(skc->skc_obj_size, align) > (PAGE_SIZE * 32)) |
ea3e6ca9 | 1013 | size = 16; /* Minimum 2Mib per-magazine */ |
48e0606a | 1014 | else if (P2ROUNDUP(skc->skc_obj_size, align) > (PAGE_SIZE)) |
ea3e6ca9 | 1015 | size = 64; /* Minimum 256Kib per-magazine */ |
48e0606a | 1016 | else if (P2ROUNDUP(skc->skc_obj_size, align) > (PAGE_SIZE / 4)) |
ea3e6ca9 | 1017 | size = 128; /* Minimum 128Kib per-magazine */ |
4afaaefa | 1018 | else |
ea3e6ca9 | 1019 | size = 256; |
4afaaefa BB |
1020 | |
1021 | RETURN(size); | |
1022 | } | |
1023 | ||
ea3e6ca9 BB |
1024 | /* |
1025 | * Allocate a per-cpu magazine to assoicate with a specific core. | |
1026 | */ | |
4afaaefa BB |
1027 | static spl_kmem_magazine_t * |
1028 | spl_magazine_alloc(spl_kmem_cache_t *skc, int node) | |
1029 | { | |
1030 | spl_kmem_magazine_t *skm; | |
1031 | int size = sizeof(spl_kmem_magazine_t) + | |
1032 | sizeof(void *) * skc->skc_mag_size; | |
1033 | ENTRY; | |
1034 | ||
ea3e6ca9 | 1035 | skm = kmem_alloc_node(size, GFP_KERNEL | __GFP_NOFAIL, node); |
4afaaefa BB |
1036 | if (skm) { |
1037 | skm->skm_magic = SKM_MAGIC; | |
1038 | skm->skm_avail = 0; | |
1039 | skm->skm_size = skc->skc_mag_size; | |
1040 | skm->skm_refill = skc->skc_mag_refill; | |
9b1b8e4c BB |
1041 | skm->skm_cache = skc; |
1042 | spl_init_delayed_work(&skm->skm_work, spl_magazine_age, skm); | |
ea3e6ca9 | 1043 | skm->skm_age = jiffies; |
4afaaefa BB |
1044 | } |
1045 | ||
1046 | RETURN(skm); | |
1047 | } | |
1048 | ||
ea3e6ca9 BB |
1049 | /* |
1050 | * Free a per-cpu magazine assoicated with a specific core. | |
1051 | */ | |
4afaaefa BB |
1052 | static void |
1053 | spl_magazine_free(spl_kmem_magazine_t *skm) | |
1054 | { | |
a0f6da3d BB |
1055 | int size = sizeof(spl_kmem_magazine_t) + |
1056 | sizeof(void *) * skm->skm_size; | |
1057 | ||
4afaaefa BB |
1058 | ENTRY; |
1059 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
1060 | ASSERT(skm->skm_avail == 0); | |
a0f6da3d BB |
1061 | |
1062 | kmem_free(skm, size); | |
4afaaefa BB |
1063 | EXIT; |
1064 | } | |
1065 | ||
ea3e6ca9 BB |
1066 | /* |
1067 | * Create all pre-cpu magazines of reasonable sizes. | |
1068 | */ | |
4afaaefa BB |
1069 | static int |
1070 | spl_magazine_create(spl_kmem_cache_t *skc) | |
1071 | { | |
37db7d8c | 1072 | int i; |
4afaaefa BB |
1073 | ENTRY; |
1074 | ||
1075 | skc->skc_mag_size = spl_magazine_size(skc); | |
ea3e6ca9 | 1076 | skc->skc_mag_refill = (skc->skc_mag_size + 1) / 2; |
4afaaefa | 1077 | |
37db7d8c BB |
1078 | for_each_online_cpu(i) { |
1079 | skc->skc_mag[i] = spl_magazine_alloc(skc, cpu_to_node(i)); | |
1080 | if (!skc->skc_mag[i]) { | |
1081 | for (i--; i >= 0; i--) | |
1082 | spl_magazine_free(skc->skc_mag[i]); | |
4afaaefa | 1083 | |
37db7d8c BB |
1084 | RETURN(-ENOMEM); |
1085 | } | |
1086 | } | |
4afaaefa | 1087 | |
9b1b8e4c BB |
1088 | /* Only after everything is allocated schedule magazine work */ |
1089 | for_each_online_cpu(i) | |
1090 | schedule_delayed_work_on(i, &skc->skc_mag[i]->skm_work, | |
1091 | skc->skc_delay / 3 * HZ); | |
1092 | ||
37db7d8c | 1093 | RETURN(0); |
4afaaefa BB |
1094 | } |
1095 | ||
ea3e6ca9 BB |
1096 | /* |
1097 | * Destroy all pre-cpu magazines. | |
1098 | */ | |
4afaaefa BB |
1099 | static void |
1100 | spl_magazine_destroy(spl_kmem_cache_t *skc) | |
1101 | { | |
37db7d8c BB |
1102 | spl_kmem_magazine_t *skm; |
1103 | int i; | |
4afaaefa | 1104 | ENTRY; |
37db7d8c BB |
1105 | |
1106 | for_each_online_cpu(i) { | |
1107 | skm = skc->skc_mag[i]; | |
1108 | (void)spl_cache_flush(skc, skm, skm->skm_avail); | |
1109 | spl_magazine_free(skm); | |
1110 | } | |
1111 | ||
4afaaefa BB |
1112 | EXIT; |
1113 | } | |
1114 | ||
ea3e6ca9 BB |
1115 | /* |
1116 | * Create a object cache based on the following arguments: | |
1117 | * name cache name | |
1118 | * size cache object size | |
1119 | * align cache object alignment | |
1120 | * ctor cache object constructor | |
1121 | * dtor cache object destructor | |
1122 | * reclaim cache object reclaim | |
1123 | * priv cache private data for ctor/dtor/reclaim | |
1124 | * vmp unused must be NULL | |
1125 | * flags | |
1126 | * KMC_NOTOUCH Disable cache object aging (unsupported) | |
1127 | * KMC_NODEBUG Disable debugging (unsupported) | |
1128 | * KMC_NOMAGAZINE Disable magazine (unsupported) | |
1129 | * KMC_NOHASH Disable hashing (unsupported) | |
1130 | * KMC_QCACHE Disable qcache (unsupported) | |
1131 | * KMC_KMEM Force kmem backed cache | |
1132 | * KMC_VMEM Force vmem backed cache | |
1133 | * KMC_OFFSLAB Locate objects off the slab | |
1134 | */ | |
2fb9b26a BB |
1135 | spl_kmem_cache_t * |
1136 | spl_kmem_cache_create(char *name, size_t size, size_t align, | |
1137 | spl_kmem_ctor_t ctor, | |
1138 | spl_kmem_dtor_t dtor, | |
1139 | spl_kmem_reclaim_t reclaim, | |
1140 | void *priv, void *vmp, int flags) | |
1141 | { | |
1142 | spl_kmem_cache_t *skc; | |
a1502d76 | 1143 | int rc, kmem_flags = KM_SLEEP; |
2fb9b26a | 1144 | ENTRY; |
937879f1 | 1145 | |
a1502d76 BB |
1146 | ASSERTF(!(flags & KMC_NOMAGAZINE), "Bad KMC_NOMAGAZINE (%x)\n", flags); |
1147 | ASSERTF(!(flags & KMC_NOHASH), "Bad KMC_NOHASH (%x)\n", flags); | |
1148 | ASSERTF(!(flags & KMC_QCACHE), "Bad KMC_QCACHE (%x)\n", flags); | |
48e0606a | 1149 | ASSERT(vmp == NULL); |
a1502d76 | 1150 | |
2fb9b26a BB |
1151 | /* We may be called when there is a non-zero preempt_count or |
1152 | * interrupts are disabled is which case we must not sleep. | |
1153 | */ | |
e9d7a2be | 1154 | if (current_thread_info()->preempt_count || irqs_disabled()) |
2fb9b26a | 1155 | kmem_flags = KM_NOSLEEP; |
0a6fd143 | 1156 | |
2fb9b26a | 1157 | /* Allocate new cache memory and initialize. */ |
ff449ac4 | 1158 | skc = (spl_kmem_cache_t *)kmem_zalloc(sizeof(*skc), kmem_flags); |
e9d7a2be | 1159 | if (skc == NULL) |
2fb9b26a | 1160 | RETURN(NULL); |
d61e12af | 1161 | |
2fb9b26a | 1162 | skc->skc_magic = SKC_MAGIC; |
2fb9b26a BB |
1163 | skc->skc_name_size = strlen(name) + 1; |
1164 | skc->skc_name = (char *)kmem_alloc(skc->skc_name_size, kmem_flags); | |
1165 | if (skc->skc_name == NULL) { | |
1166 | kmem_free(skc, sizeof(*skc)); | |
1167 | RETURN(NULL); | |
1168 | } | |
1169 | strncpy(skc->skc_name, name, skc->skc_name_size); | |
1170 | ||
e9d7a2be BB |
1171 | skc->skc_ctor = ctor; |
1172 | skc->skc_dtor = dtor; | |
1173 | skc->skc_reclaim = reclaim; | |
2fb9b26a BB |
1174 | skc->skc_private = priv; |
1175 | skc->skc_vmp = vmp; | |
1176 | skc->skc_flags = flags; | |
1177 | skc->skc_obj_size = size; | |
48e0606a | 1178 | skc->skc_obj_align = SPL_KMEM_CACHE_ALIGN; |
2fb9b26a | 1179 | skc->skc_delay = SPL_KMEM_CACHE_DELAY; |
37db7d8c | 1180 | skc->skc_reap = SPL_KMEM_CACHE_REAP; |
ea3e6ca9 | 1181 | atomic_set(&skc->skc_ref, 0); |
2fb9b26a | 1182 | |
2fb9b26a BB |
1183 | INIT_LIST_HEAD(&skc->skc_list); |
1184 | INIT_LIST_HEAD(&skc->skc_complete_list); | |
1185 | INIT_LIST_HEAD(&skc->skc_partial_list); | |
d46630e0 | 1186 | spin_lock_init(&skc->skc_lock); |
e9d7a2be BB |
1187 | skc->skc_slab_fail = 0; |
1188 | skc->skc_slab_create = 0; | |
1189 | skc->skc_slab_destroy = 0; | |
2fb9b26a BB |
1190 | skc->skc_slab_total = 0; |
1191 | skc->skc_slab_alloc = 0; | |
1192 | skc->skc_slab_max = 0; | |
1193 | skc->skc_obj_total = 0; | |
1194 | skc->skc_obj_alloc = 0; | |
1195 | skc->skc_obj_max = 0; | |
a1502d76 | 1196 | |
48e0606a BB |
1197 | if (align) { |
1198 | ASSERT((align & (align - 1)) == 0); /* Power of two */ | |
1199 | ASSERT(align >= SPL_KMEM_CACHE_ALIGN); /* Minimum size */ | |
1200 | skc->skc_obj_align = align; | |
1201 | } | |
1202 | ||
a1502d76 BB |
1203 | /* If none passed select a cache type based on object size */ |
1204 | if (!(skc->skc_flags & (KMC_KMEM | KMC_VMEM))) { | |
48e0606a BB |
1205 | if (P2ROUNDUP(skc->skc_obj_size, skc->skc_obj_align) < |
1206 | (PAGE_SIZE / 8)) { | |
a1502d76 BB |
1207 | skc->skc_flags |= KMC_KMEM; |
1208 | } else { | |
1209 | skc->skc_flags |= KMC_VMEM; | |
1210 | } | |
1211 | } | |
1212 | ||
48e0606a BB |
1213 | rc = spl_slab_size(skc, &skc->skc_slab_objs, &skc->skc_slab_size); |
1214 | if (rc) | |
1215 | GOTO(out, rc); | |
4afaaefa BB |
1216 | |
1217 | rc = spl_magazine_create(skc); | |
48e0606a BB |
1218 | if (rc) |
1219 | GOTO(out, rc); | |
2fb9b26a | 1220 | |
ea3e6ca9 | 1221 | spl_init_delayed_work(&skc->skc_work, spl_cache_age, skc); |
37db7d8c | 1222 | schedule_delayed_work(&skc->skc_work, skc->skc_delay / 3 * HZ); |
ea3e6ca9 | 1223 | |
2fb9b26a | 1224 | down_write(&spl_kmem_cache_sem); |
e9d7a2be | 1225 | list_add_tail(&skc->skc_list, &spl_kmem_cache_list); |
2fb9b26a BB |
1226 | up_write(&spl_kmem_cache_sem); |
1227 | ||
e9d7a2be | 1228 | RETURN(skc); |
48e0606a BB |
1229 | out: |
1230 | kmem_free(skc->skc_name, skc->skc_name_size); | |
1231 | kmem_free(skc, sizeof(*skc)); | |
1232 | RETURN(NULL); | |
f1ca4da6 | 1233 | } |
2fb9b26a | 1234 | EXPORT_SYMBOL(spl_kmem_cache_create); |
f1ca4da6 | 1235 | |
ea3e6ca9 BB |
1236 | /* |
1237 | * Destroy a cache and all objects assoicated with the cache. | |
1238 | */ | |
2fb9b26a BB |
1239 | void |
1240 | spl_kmem_cache_destroy(spl_kmem_cache_t *skc) | |
f1ca4da6 | 1241 | { |
ea3e6ca9 | 1242 | DECLARE_WAIT_QUEUE_HEAD(wq); |
9b1b8e4c | 1243 | int i; |
2fb9b26a | 1244 | ENTRY; |
f1ca4da6 | 1245 | |
e9d7a2be BB |
1246 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1247 | ||
1248 | down_write(&spl_kmem_cache_sem); | |
1249 | list_del_init(&skc->skc_list); | |
1250 | up_write(&spl_kmem_cache_sem); | |
2fb9b26a | 1251 | |
ea3e6ca9 BB |
1252 | /* Cancel any and wait for any pending delayed work */ |
1253 | ASSERT(!test_and_set_bit(KMC_BIT_DESTROY, &skc->skc_flags)); | |
1254 | cancel_delayed_work(&skc->skc_work); | |
9b1b8e4c BB |
1255 | for_each_online_cpu(i) |
1256 | cancel_delayed_work(&skc->skc_mag[i]->skm_work); | |
1257 | ||
ea3e6ca9 BB |
1258 | flush_scheduled_work(); |
1259 | ||
1260 | /* Wait until all current callers complete, this is mainly | |
1261 | * to catch the case where a low memory situation triggers a | |
1262 | * cache reaping action which races with this destroy. */ | |
1263 | wait_event(wq, atomic_read(&skc->skc_ref) == 0); | |
1264 | ||
4afaaefa | 1265 | spl_magazine_destroy(skc); |
37db7d8c | 1266 | spl_slab_reclaim(skc, 0, 1); |
d46630e0 | 1267 | spin_lock(&skc->skc_lock); |
d6a26c6a | 1268 | |
2fb9b26a | 1269 | /* Validate there are no objects in use and free all the |
4afaaefa | 1270 | * spl_kmem_slab_t, spl_kmem_obj_t, and object buffers. */ |
ea3e6ca9 BB |
1271 | ASSERT3U(skc->skc_slab_alloc, ==, 0); |
1272 | ASSERT3U(skc->skc_obj_alloc, ==, 0); | |
1273 | ASSERT3U(skc->skc_slab_total, ==, 0); | |
1274 | ASSERT3U(skc->skc_obj_total, ==, 0); | |
2fb9b26a | 1275 | ASSERT(list_empty(&skc->skc_complete_list)); |
a1502d76 | 1276 | |
2fb9b26a | 1277 | kmem_free(skc->skc_name, skc->skc_name_size); |
d46630e0 | 1278 | spin_unlock(&skc->skc_lock); |
ff449ac4 | 1279 | |
4afaaefa | 1280 | kmem_free(skc, sizeof(*skc)); |
2fb9b26a BB |
1281 | |
1282 | EXIT; | |
f1ca4da6 | 1283 | } |
2fb9b26a | 1284 | EXPORT_SYMBOL(spl_kmem_cache_destroy); |
f1ca4da6 | 1285 | |
ea3e6ca9 BB |
1286 | /* |
1287 | * Allocate an object from a slab attached to the cache. This is used to | |
1288 | * repopulate the per-cpu magazine caches in batches when they run low. | |
1289 | */ | |
4afaaefa BB |
1290 | static void * |
1291 | spl_cache_obj(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks) | |
f1ca4da6 | 1292 | { |
2fb9b26a | 1293 | spl_kmem_obj_t *sko; |
f1ca4da6 | 1294 | |
e9d7a2be BB |
1295 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1296 | ASSERT(sks->sks_magic == SKS_MAGIC); | |
4afaaefa | 1297 | ASSERT(spin_is_locked(&skc->skc_lock)); |
2fb9b26a | 1298 | |
a1502d76 | 1299 | sko = list_entry(sks->sks_free_list.next, spl_kmem_obj_t, sko_list); |
4afaaefa BB |
1300 | ASSERT(sko->sko_magic == SKO_MAGIC); |
1301 | ASSERT(sko->sko_addr != NULL); | |
2fb9b26a | 1302 | |
a1502d76 | 1303 | /* Remove from sks_free_list */ |
4afaaefa | 1304 | list_del_init(&sko->sko_list); |
2fb9b26a | 1305 | |
4afaaefa BB |
1306 | sks->sks_age = jiffies; |
1307 | sks->sks_ref++; | |
1308 | skc->skc_obj_alloc++; | |
2fb9b26a | 1309 | |
4afaaefa BB |
1310 | /* Track max obj usage statistics */ |
1311 | if (skc->skc_obj_alloc > skc->skc_obj_max) | |
1312 | skc->skc_obj_max = skc->skc_obj_alloc; | |
2fb9b26a | 1313 | |
4afaaefa BB |
1314 | /* Track max slab usage statistics */ |
1315 | if (sks->sks_ref == 1) { | |
1316 | skc->skc_slab_alloc++; | |
f1ca4da6 | 1317 | |
4afaaefa BB |
1318 | if (skc->skc_slab_alloc > skc->skc_slab_max) |
1319 | skc->skc_slab_max = skc->skc_slab_alloc; | |
2fb9b26a BB |
1320 | } |
1321 | ||
4afaaefa BB |
1322 | return sko->sko_addr; |
1323 | } | |
c30df9c8 | 1324 | |
ea3e6ca9 BB |
1325 | /* |
1326 | * No available objects on any slabsi, create a new slab. Since this | |
1327 | * is an expensive operation we do it without holding the spinlock and | |
1328 | * only briefly aquire it when we link in the fully allocated and | |
1329 | * constructed slab. | |
4afaaefa BB |
1330 | */ |
1331 | static spl_kmem_slab_t * | |
1332 | spl_cache_grow(spl_kmem_cache_t *skc, int flags) | |
1333 | { | |
e9d7a2be | 1334 | spl_kmem_slab_t *sks; |
4afaaefa | 1335 | ENTRY; |
f1ca4da6 | 1336 | |
e9d7a2be | 1337 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
1338 | local_irq_enable(); |
1339 | might_sleep(); | |
e9d7a2be | 1340 | |
ea3e6ca9 BB |
1341 | /* |
1342 | * Before allocating a new slab check if the slab is being reaped. | |
1343 | * If it is there is a good chance we can wait until it finishes | |
1344 | * and then use one of the newly freed but not aged-out slabs. | |
1345 | */ | |
1346 | if (test_bit(KMC_BIT_REAPING, &skc->skc_flags)) { | |
1347 | schedule(); | |
1348 | GOTO(out, sks= NULL); | |
4afaaefa | 1349 | } |
2fb9b26a | 1350 | |
ea3e6ca9 BB |
1351 | /* Allocate a new slab for the cache */ |
1352 | sks = spl_slab_alloc(skc, flags | __GFP_NORETRY | __GFP_NOWARN); | |
1353 | if (sks == NULL) | |
1354 | GOTO(out, sks = NULL); | |
4afaaefa | 1355 | |
ea3e6ca9 | 1356 | /* Link the new empty slab in to the end of skc_partial_list. */ |
d46630e0 | 1357 | spin_lock(&skc->skc_lock); |
2fb9b26a BB |
1358 | skc->skc_slab_total++; |
1359 | skc->skc_obj_total += sks->sks_objs; | |
1360 | list_add_tail(&sks->sks_list, &skc->skc_partial_list); | |
d46630e0 | 1361 | spin_unlock(&skc->skc_lock); |
ea3e6ca9 BB |
1362 | out: |
1363 | local_irq_disable(); | |
4afaaefa BB |
1364 | |
1365 | RETURN(sks); | |
f1ca4da6 BB |
1366 | } |
1367 | ||
ea3e6ca9 BB |
1368 | /* |
1369 | * Refill a per-cpu magazine with objects from the slabs for this | |
1370 | * cache. Ideally the magazine can be repopulated using existing | |
1371 | * objects which have been released, however if we are unable to | |
1372 | * locate enough free objects new slabs of objects will be created. | |
1373 | */ | |
4afaaefa BB |
1374 | static int |
1375 | spl_cache_refill(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flags) | |
f1ca4da6 | 1376 | { |
e9d7a2be BB |
1377 | spl_kmem_slab_t *sks; |
1378 | int rc = 0, refill; | |
937879f1 | 1379 | ENTRY; |
f1ca4da6 | 1380 | |
e9d7a2be BB |
1381 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1382 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
1383 | ||
e9d7a2be | 1384 | refill = MIN(skm->skm_refill, skm->skm_size - skm->skm_avail); |
d46630e0 | 1385 | spin_lock(&skc->skc_lock); |
ff449ac4 | 1386 | |
4afaaefa | 1387 | while (refill > 0) { |
ea3e6ca9 | 1388 | /* No slabs available we may need to grow the cache */ |
4afaaefa BB |
1389 | if (list_empty(&skc->skc_partial_list)) { |
1390 | spin_unlock(&skc->skc_lock); | |
ff449ac4 | 1391 | |
4afaaefa BB |
1392 | sks = spl_cache_grow(skc, flags); |
1393 | if (!sks) | |
e9d7a2be | 1394 | GOTO(out, rc); |
4afaaefa BB |
1395 | |
1396 | /* Rescheduled to different CPU skm is not local */ | |
1397 | if (skm != skc->skc_mag[smp_processor_id()]) | |
e9d7a2be BB |
1398 | GOTO(out, rc); |
1399 | ||
1400 | /* Potentially rescheduled to the same CPU but | |
1401 | * allocations may have occured from this CPU while | |
1402 | * we were sleeping so recalculate max refill. */ | |
1403 | refill = MIN(refill, skm->skm_size - skm->skm_avail); | |
4afaaefa BB |
1404 | |
1405 | spin_lock(&skc->skc_lock); | |
1406 | continue; | |
1407 | } | |
d46630e0 | 1408 | |
4afaaefa BB |
1409 | /* Grab the next available slab */ |
1410 | sks = list_entry((&skc->skc_partial_list)->next, | |
1411 | spl_kmem_slab_t, sks_list); | |
1412 | ASSERT(sks->sks_magic == SKS_MAGIC); | |
1413 | ASSERT(sks->sks_ref < sks->sks_objs); | |
1414 | ASSERT(!list_empty(&sks->sks_free_list)); | |
d46630e0 | 1415 | |
4afaaefa | 1416 | /* Consume as many objects as needed to refill the requested |
e9d7a2be BB |
1417 | * cache. We must also be careful not to overfill it. */ |
1418 | while (sks->sks_ref < sks->sks_objs && refill-- > 0 && ++rc) { | |
1419 | ASSERT(skm->skm_avail < skm->skm_size); | |
1420 | ASSERT(rc < skm->skm_size); | |
4afaaefa | 1421 | skm->skm_objs[skm->skm_avail++]=spl_cache_obj(skc,sks); |
e9d7a2be | 1422 | } |
f1ca4da6 | 1423 | |
4afaaefa BB |
1424 | /* Move slab to skc_complete_list when full */ |
1425 | if (sks->sks_ref == sks->sks_objs) { | |
1426 | list_del(&sks->sks_list); | |
1427 | list_add(&sks->sks_list, &skc->skc_complete_list); | |
2fb9b26a BB |
1428 | } |
1429 | } | |
57d86234 | 1430 | |
4afaaefa BB |
1431 | spin_unlock(&skc->skc_lock); |
1432 | out: | |
1433 | /* Returns the number of entries added to cache */ | |
e9d7a2be | 1434 | RETURN(rc); |
4afaaefa BB |
1435 | } |
1436 | ||
ea3e6ca9 BB |
1437 | /* |
1438 | * Release an object back to the slab from which it came. | |
1439 | */ | |
4afaaefa BB |
1440 | static void |
1441 | spl_cache_shrink(spl_kmem_cache_t *skc, void *obj) | |
1442 | { | |
e9d7a2be | 1443 | spl_kmem_slab_t *sks = NULL; |
4afaaefa BB |
1444 | spl_kmem_obj_t *sko = NULL; |
1445 | ENTRY; | |
1446 | ||
e9d7a2be | 1447 | ASSERT(skc->skc_magic == SKC_MAGIC); |
4afaaefa BB |
1448 | ASSERT(spin_is_locked(&skc->skc_lock)); |
1449 | ||
48e0606a | 1450 | sko = obj + P2ROUNDUP(skc->skc_obj_size, skc->skc_obj_align); |
a1502d76 | 1451 | ASSERT(sko->sko_magic == SKO_MAGIC); |
4afaaefa BB |
1452 | |
1453 | sks = sko->sko_slab; | |
a1502d76 | 1454 | ASSERT(sks->sks_magic == SKS_MAGIC); |
2fb9b26a | 1455 | ASSERT(sks->sks_cache == skc); |
2fb9b26a | 1456 | list_add(&sko->sko_list, &sks->sks_free_list); |
d6a26c6a | 1457 | |
2fb9b26a | 1458 | sks->sks_age = jiffies; |
4afaaefa | 1459 | sks->sks_ref--; |
2fb9b26a | 1460 | skc->skc_obj_alloc--; |
f1ca4da6 | 1461 | |
2fb9b26a | 1462 | /* Move slab to skc_partial_list when no longer full. Slabs |
4afaaefa BB |
1463 | * are added to the head to keep the partial list is quasi-full |
1464 | * sorted order. Fuller at the head, emptier at the tail. */ | |
1465 | if (sks->sks_ref == (sks->sks_objs - 1)) { | |
2fb9b26a BB |
1466 | list_del(&sks->sks_list); |
1467 | list_add(&sks->sks_list, &skc->skc_partial_list); | |
1468 | } | |
f1ca4da6 | 1469 | |
2fb9b26a | 1470 | /* Move emply slabs to the end of the partial list so |
4afaaefa BB |
1471 | * they can be easily found and freed during reclamation. */ |
1472 | if (sks->sks_ref == 0) { | |
2fb9b26a BB |
1473 | list_del(&sks->sks_list); |
1474 | list_add_tail(&sks->sks_list, &skc->skc_partial_list); | |
1475 | skc->skc_slab_alloc--; | |
1476 | } | |
1477 | ||
4afaaefa BB |
1478 | EXIT; |
1479 | } | |
1480 | ||
ea3e6ca9 BB |
1481 | /* |
1482 | * Release a batch of objects from a per-cpu magazine back to their | |
1483 | * respective slabs. This occurs when we exceed the magazine size, | |
1484 | * are under memory pressure, when the cache is idle, or during | |
1485 | * cache cleanup. The flush argument contains the number of entries | |
1486 | * to remove from the magazine. | |
1487 | */ | |
4afaaefa BB |
1488 | static int |
1489 | spl_cache_flush(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flush) | |
1490 | { | |
1491 | int i, count = MIN(flush, skm->skm_avail); | |
1492 | ENTRY; | |
1493 | ||
e9d7a2be BB |
1494 | ASSERT(skc->skc_magic == SKC_MAGIC); |
1495 | ASSERT(skm->skm_magic == SKM_MAGIC); | |
4afaaefa | 1496 | |
ea3e6ca9 BB |
1497 | /* |
1498 | * XXX: Currently we simply return objects from the magazine to | |
1499 | * the slabs in fifo order. The ideal thing to do from a memory | |
1500 | * fragmentation standpoint is to cheaply determine the set of | |
1501 | * objects in the magazine which will result in the largest | |
1502 | * number of free slabs if released from the magazine. | |
1503 | */ | |
4afaaefa BB |
1504 | spin_lock(&skc->skc_lock); |
1505 | for (i = 0; i < count; i++) | |
1506 | spl_cache_shrink(skc, skm->skm_objs[i]); | |
1507 | ||
e9d7a2be BB |
1508 | skm->skm_avail -= count; |
1509 | memmove(skm->skm_objs, &(skm->skm_objs[count]), | |
4afaaefa BB |
1510 | sizeof(void *) * skm->skm_avail); |
1511 | ||
d46630e0 | 1512 | spin_unlock(&skc->skc_lock); |
4afaaefa BB |
1513 | |
1514 | RETURN(count); | |
1515 | } | |
1516 | ||
ea3e6ca9 BB |
1517 | /* |
1518 | * Allocate an object from the per-cpu magazine, or if the magazine | |
1519 | * is empty directly allocate from a slab and repopulate the magazine. | |
1520 | */ | |
4afaaefa BB |
1521 | void * |
1522 | spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags) | |
1523 | { | |
1524 | spl_kmem_magazine_t *skm; | |
1525 | unsigned long irq_flags; | |
1526 | void *obj = NULL; | |
1527 | ENTRY; | |
1528 | ||
e9d7a2be | 1529 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
1530 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
1531 | ASSERT(flags & KM_SLEEP); | |
1532 | atomic_inc(&skc->skc_ref); | |
4afaaefa BB |
1533 | local_irq_save(irq_flags); |
1534 | ||
1535 | restart: | |
1536 | /* Safe to update per-cpu structure without lock, but | |
1537 | * in the restart case we must be careful to reaquire | |
1538 | * the local magazine since this may have changed | |
1539 | * when we need to grow the cache. */ | |
1540 | skm = skc->skc_mag[smp_processor_id()]; | |
e9d7a2be BB |
1541 | ASSERTF(skm->skm_magic == SKM_MAGIC, "%x != %x: %s/%p/%p %x/%x/%x\n", |
1542 | skm->skm_magic, SKM_MAGIC, skc->skc_name, skc, skm, | |
1543 | skm->skm_size, skm->skm_refill, skm->skm_avail); | |
4afaaefa BB |
1544 | |
1545 | if (likely(skm->skm_avail)) { | |
1546 | /* Object available in CPU cache, use it */ | |
1547 | obj = skm->skm_objs[--skm->skm_avail]; | |
ea3e6ca9 | 1548 | skm->skm_age = jiffies; |
4afaaefa BB |
1549 | } else { |
1550 | /* Per-CPU cache empty, directly allocate from | |
1551 | * the slab and refill the per-CPU cache. */ | |
1552 | (void)spl_cache_refill(skc, skm, flags); | |
1553 | GOTO(restart, obj = NULL); | |
1554 | } | |
1555 | ||
1556 | local_irq_restore(irq_flags); | |
fece7c99 | 1557 | ASSERT(obj); |
48e0606a | 1558 | ASSERT(((unsigned long)(obj) % skc->skc_obj_align) == 0); |
4afaaefa BB |
1559 | |
1560 | /* Pre-emptively migrate object to CPU L1 cache */ | |
1561 | prefetchw(obj); | |
ea3e6ca9 | 1562 | atomic_dec(&skc->skc_ref); |
4afaaefa BB |
1563 | |
1564 | RETURN(obj); | |
1565 | } | |
1566 | EXPORT_SYMBOL(spl_kmem_cache_alloc); | |
1567 | ||
ea3e6ca9 BB |
1568 | /* |
1569 | * Free an object back to the local per-cpu magazine, there is no | |
1570 | * guarantee that this is the same magazine the object was originally | |
1571 | * allocated from. We may need to flush entire from the magazine | |
1572 | * back to the slabs to make space. | |
1573 | */ | |
4afaaefa BB |
1574 | void |
1575 | spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj) | |
1576 | { | |
1577 | spl_kmem_magazine_t *skm; | |
1578 | unsigned long flags; | |
1579 | ENTRY; | |
1580 | ||
e9d7a2be | 1581 | ASSERT(skc->skc_magic == SKC_MAGIC); |
ea3e6ca9 BB |
1582 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
1583 | atomic_inc(&skc->skc_ref); | |
4afaaefa BB |
1584 | local_irq_save(flags); |
1585 | ||
1586 | /* Safe to update per-cpu structure without lock, but | |
1587 | * no remote memory allocation tracking is being performed | |
1588 | * it is entirely possible to allocate an object from one | |
1589 | * CPU cache and return it to another. */ | |
1590 | skm = skc->skc_mag[smp_processor_id()]; | |
e9d7a2be | 1591 | ASSERT(skm->skm_magic == SKM_MAGIC); |
4afaaefa BB |
1592 | |
1593 | /* Per-CPU cache full, flush it to make space */ | |
1594 | if (unlikely(skm->skm_avail >= skm->skm_size)) | |
1595 | (void)spl_cache_flush(skc, skm, skm->skm_refill); | |
1596 | ||
1597 | /* Available space in cache, use it */ | |
1598 | skm->skm_objs[skm->skm_avail++] = obj; | |
1599 | ||
1600 | local_irq_restore(flags); | |
ea3e6ca9 | 1601 | atomic_dec(&skc->skc_ref); |
4afaaefa BB |
1602 | |
1603 | EXIT; | |
f1ca4da6 | 1604 | } |
2fb9b26a | 1605 | EXPORT_SYMBOL(spl_kmem_cache_free); |
5c2bb9b2 | 1606 | |
ea3e6ca9 BB |
1607 | /* |
1608 | * The generic shrinker function for all caches. Under linux a shrinker | |
1609 | * may not be tightly coupled with a slab cache. In fact linux always | |
1610 | * systematically trys calling all registered shrinker callbacks which | |
1611 | * report that they contain unused objects. Because of this we only | |
1612 | * register one shrinker function in the shim layer for all slab caches. | |
1613 | * We always attempt to shrink all caches when this generic shrinker | |
1614 | * is called. The shrinker should return the number of free objects | |
1615 | * in the cache when called with nr_to_scan == 0 but not attempt to | |
1616 | * free any objects. When nr_to_scan > 0 it is a request that nr_to_scan | |
1617 | * objects should be freed, because Solaris semantics are to free | |
1618 | * all available objects we may free more objects than requested. | |
1619 | */ | |
2fb9b26a | 1620 | static int |
4afaaefa | 1621 | spl_kmem_cache_generic_shrinker(int nr_to_scan, unsigned int gfp_mask) |
2fb9b26a | 1622 | { |
e9d7a2be | 1623 | spl_kmem_cache_t *skc; |
ea3e6ca9 | 1624 | int unused = 0; |
5c2bb9b2 | 1625 | |
e9d7a2be | 1626 | down_read(&spl_kmem_cache_sem); |
ea3e6ca9 BB |
1627 | list_for_each_entry(skc, &spl_kmem_cache_list, skc_list) { |
1628 | if (nr_to_scan) | |
1629 | spl_kmem_cache_reap_now(skc); | |
1630 | ||
1631 | /* | |
1632 | * Presume everything alloc'ed in reclaimable, this ensures | |
1633 | * we are called again with nr_to_scan > 0 so can try and | |
1634 | * reclaim. The exact number is not important either so | |
1635 | * we forgo taking this already highly contented lock. | |
1636 | */ | |
1637 | unused += skc->skc_obj_alloc; | |
1638 | } | |
e9d7a2be | 1639 | up_read(&spl_kmem_cache_sem); |
2fb9b26a | 1640 | |
ea3e6ca9 | 1641 | return (unused * sysctl_vfs_cache_pressure) / 100; |
5c2bb9b2 | 1642 | } |
5c2bb9b2 | 1643 | |
ea3e6ca9 BB |
1644 | /* |
1645 | * Call the registered reclaim function for a cache. Depending on how | |
1646 | * many and which objects are released it may simply repopulate the | |
1647 | * local magazine which will then need to age-out. Objects which cannot | |
1648 | * fit in the magazine we will be released back to their slabs which will | |
1649 | * also need to age out before being release. This is all just best | |
1650 | * effort and we do not want to thrash creating and destroying slabs. | |
1651 | */ | |
57d86234 | 1652 | void |
2fb9b26a | 1653 | spl_kmem_cache_reap_now(spl_kmem_cache_t *skc) |
57d86234 | 1654 | { |
2fb9b26a | 1655 | ENTRY; |
e9d7a2be BB |
1656 | |
1657 | ASSERT(skc->skc_magic == SKC_MAGIC); | |
ea3e6ca9 | 1658 | ASSERT(!test_bit(KMC_BIT_DESTROY, &skc->skc_flags)); |
2fb9b26a | 1659 | |
ea3e6ca9 BB |
1660 | /* Prevent concurrent cache reaping when contended */ |
1661 | if (test_and_set_bit(KMC_BIT_REAPING, &skc->skc_flags)) { | |
1662 | EXIT; | |
1663 | return; | |
1664 | } | |
2fb9b26a | 1665 | |
ea3e6ca9 | 1666 | atomic_inc(&skc->skc_ref); |
4afaaefa | 1667 | |
ea3e6ca9 BB |
1668 | if (skc->skc_reclaim) |
1669 | skc->skc_reclaim(skc->skc_private); | |
4afaaefa | 1670 | |
37db7d8c | 1671 | spl_slab_reclaim(skc, skc->skc_reap, 0); |
ea3e6ca9 BB |
1672 | clear_bit(KMC_BIT_REAPING, &skc->skc_flags); |
1673 | atomic_dec(&skc->skc_ref); | |
4afaaefa | 1674 | |
2fb9b26a | 1675 | EXIT; |
57d86234 | 1676 | } |
2fb9b26a | 1677 | EXPORT_SYMBOL(spl_kmem_cache_reap_now); |
57d86234 | 1678 | |
ea3e6ca9 BB |
1679 | /* |
1680 | * Reap all free slabs from all registered caches. | |
1681 | */ | |
f1b59d26 | 1682 | void |
2fb9b26a | 1683 | spl_kmem_reap(void) |
937879f1 | 1684 | { |
4afaaefa | 1685 | spl_kmem_cache_generic_shrinker(KMC_REAP_CHUNK, GFP_KERNEL); |
f1ca4da6 | 1686 | } |
2fb9b26a | 1687 | EXPORT_SYMBOL(spl_kmem_reap); |
5d86345d | 1688 | |
ff449ac4 | 1689 | #if defined(DEBUG_KMEM) && defined(DEBUG_KMEM_TRACKING) |
c6dc93d6 | 1690 | static char * |
4afaaefa | 1691 | spl_sprintf_addr(kmem_debug_t *kd, char *str, int len, int min) |
d6a26c6a | 1692 | { |
e9d7a2be | 1693 | int size = ((len - 1) < kd->kd_size) ? (len - 1) : kd->kd_size; |
d6a26c6a BB |
1694 | int i, flag = 1; |
1695 | ||
1696 | ASSERT(str != NULL && len >= 17); | |
e9d7a2be | 1697 | memset(str, 0, len); |
d6a26c6a BB |
1698 | |
1699 | /* Check for a fully printable string, and while we are at | |
1700 | * it place the printable characters in the passed buffer. */ | |
1701 | for (i = 0; i < size; i++) { | |
e9d7a2be BB |
1702 | str[i] = ((char *)(kd->kd_addr))[i]; |
1703 | if (isprint(str[i])) { | |
1704 | continue; | |
1705 | } else { | |
1706 | /* Minimum number of printable characters found | |
1707 | * to make it worthwhile to print this as ascii. */ | |
1708 | if (i > min) | |
1709 | break; | |
1710 | ||
1711 | flag = 0; | |
1712 | break; | |
1713 | } | |
d6a26c6a BB |
1714 | } |
1715 | ||
1716 | if (!flag) { | |
1717 | sprintf(str, "%02x%02x%02x%02x%02x%02x%02x%02x", | |
1718 | *((uint8_t *)kd->kd_addr), | |
1719 | *((uint8_t *)kd->kd_addr + 2), | |
1720 | *((uint8_t *)kd->kd_addr + 4), | |
1721 | *((uint8_t *)kd->kd_addr + 6), | |
1722 | *((uint8_t *)kd->kd_addr + 8), | |
1723 | *((uint8_t *)kd->kd_addr + 10), | |
1724 | *((uint8_t *)kd->kd_addr + 12), | |
1725 | *((uint8_t *)kd->kd_addr + 14)); | |
1726 | } | |
1727 | ||
1728 | return str; | |
1729 | } | |
1730 | ||
a1502d76 BB |
1731 | static int |
1732 | spl_kmem_init_tracking(struct list_head *list, spinlock_t *lock, int size) | |
1733 | { | |
1734 | int i; | |
1735 | ENTRY; | |
1736 | ||
1737 | spin_lock_init(lock); | |
1738 | INIT_LIST_HEAD(list); | |
1739 | ||
1740 | for (i = 0; i < size; i++) | |
1741 | INIT_HLIST_HEAD(&kmem_table[i]); | |
1742 | ||
1743 | RETURN(0); | |
1744 | } | |
1745 | ||
ff449ac4 BB |
1746 | static void |
1747 | spl_kmem_fini_tracking(struct list_head *list, spinlock_t *lock) | |
5d86345d | 1748 | { |
2fb9b26a BB |
1749 | unsigned long flags; |
1750 | kmem_debug_t *kd; | |
1751 | char str[17]; | |
a1502d76 | 1752 | ENTRY; |
2fb9b26a | 1753 | |
ff449ac4 BB |
1754 | spin_lock_irqsave(lock, flags); |
1755 | if (!list_empty(list)) | |
a0f6da3d BB |
1756 | printk(KERN_WARNING "%-16s %-5s %-16s %s:%s\n", "address", |
1757 | "size", "data", "func", "line"); | |
2fb9b26a | 1758 | |
ff449ac4 | 1759 | list_for_each_entry(kd, list, kd_list) |
a0f6da3d | 1760 | printk(KERN_WARNING "%p %-5d %-16s %s:%d\n", kd->kd_addr, |
b6b2acc6 | 1761 | (int)kd->kd_size, spl_sprintf_addr(kd, str, 17, 8), |
2fb9b26a BB |
1762 | kd->kd_func, kd->kd_line); |
1763 | ||
ff449ac4 | 1764 | spin_unlock_irqrestore(lock, flags); |
a1502d76 | 1765 | EXIT; |
ff449ac4 BB |
1766 | } |
1767 | #else /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */ | |
a1502d76 | 1768 | #define spl_kmem_init_tracking(list, lock, size) |
ff449ac4 BB |
1769 | #define spl_kmem_fini_tracking(list, lock) |
1770 | #endif /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */ | |
1771 | ||
36b313da BB |
1772 | static void |
1773 | spl_kmem_init_globals(void) | |
1774 | { | |
1775 | struct zone *zone; | |
1776 | ||
1777 | /* For now all zones are includes, it may be wise to restrict | |
1778 | * this to normal and highmem zones if we see problems. */ | |
1779 | for_each_zone(zone) { | |
1780 | ||
1781 | if (!populated_zone(zone)) | |
1782 | continue; | |
1783 | ||
1784 | minfree += zone->pages_min; | |
1785 | desfree += zone->pages_low; | |
1786 | lotsfree += zone->pages_high; | |
1787 | } | |
4ab13d3b BB |
1788 | |
1789 | /* Solaris default values */ | |
96dded38 BB |
1790 | swapfs_minfree = MAX(2*1024*1024 >> PAGE_SHIFT, physmem >> 3); |
1791 | swapfs_reserve = MIN(4*1024*1024 >> PAGE_SHIFT, physmem >> 4); | |
36b313da BB |
1792 | } |
1793 | ||
d1ff2312 BB |
1794 | /* |
1795 | * Called at module init when it is safe to use spl_kallsyms_lookup_name() | |
1796 | */ | |
1797 | int | |
1798 | spl_kmem_init_kallsyms_lookup(void) | |
1799 | { | |
1800 | #ifndef HAVE_GET_VMALLOC_INFO | |
1801 | get_vmalloc_info_fn = (get_vmalloc_info_t) | |
1802 | spl_kallsyms_lookup_name("get_vmalloc_info"); | |
e11d6c5f BB |
1803 | if (!get_vmalloc_info_fn) { |
1804 | printk(KERN_ERR "Error: Unknown symbol get_vmalloc_info\n"); | |
d1ff2312 | 1805 | return -EFAULT; |
e11d6c5f | 1806 | } |
d1ff2312 BB |
1807 | #endif /* HAVE_GET_VMALLOC_INFO */ |
1808 | ||
1809 | #ifndef HAVE_FIRST_ONLINE_PGDAT | |
1810 | first_online_pgdat_fn = (first_online_pgdat_t) | |
1811 | spl_kallsyms_lookup_name("first_online_pgdat"); | |
e11d6c5f BB |
1812 | if (!first_online_pgdat_fn) { |
1813 | printk(KERN_ERR "Error: Unknown symbol first_online_pgdat\n"); | |
d1ff2312 | 1814 | return -EFAULT; |
e11d6c5f | 1815 | } |
d1ff2312 BB |
1816 | #endif /* HAVE_FIRST_ONLINE_PGDAT */ |
1817 | ||
1818 | #ifndef HAVE_NEXT_ONLINE_PGDAT | |
1819 | next_online_pgdat_fn = (next_online_pgdat_t) | |
1820 | spl_kallsyms_lookup_name("next_online_pgdat"); | |
e11d6c5f BB |
1821 | if (!next_online_pgdat_fn) { |
1822 | printk(KERN_ERR "Error: Unknown symbol next_online_pgdat\n"); | |
d1ff2312 | 1823 | return -EFAULT; |
e11d6c5f | 1824 | } |
d1ff2312 BB |
1825 | #endif /* HAVE_NEXT_ONLINE_PGDAT */ |
1826 | ||
1827 | #ifndef HAVE_NEXT_ZONE | |
1828 | next_zone_fn = (next_zone_t) | |
1829 | spl_kallsyms_lookup_name("next_zone"); | |
e11d6c5f BB |
1830 | if (!next_zone_fn) { |
1831 | printk(KERN_ERR "Error: Unknown symbol next_zone\n"); | |
d1ff2312 | 1832 | return -EFAULT; |
e11d6c5f | 1833 | } |
d1ff2312 BB |
1834 | #endif /* HAVE_NEXT_ZONE */ |
1835 | ||
e11d6c5f BB |
1836 | #ifndef HAVE_ZONE_STAT_ITEM_FIA |
1837 | # ifndef HAVE_GET_ZONE_COUNTS | |
d1ff2312 BB |
1838 | get_zone_counts_fn = (get_zone_counts_t) |
1839 | spl_kallsyms_lookup_name("get_zone_counts"); | |
e11d6c5f BB |
1840 | if (!get_zone_counts_fn) { |
1841 | printk(KERN_ERR "Error: Unknown symbol get_zone_counts\n"); | |
d1ff2312 | 1842 | return -EFAULT; |
e11d6c5f | 1843 | } |
e11d6c5f BB |
1844 | # endif /* HAVE_GET_ZONE_COUNTS */ |
1845 | #endif /* HAVE_ZONE_STAT_ITEM_FIA */ | |
d1ff2312 BB |
1846 | |
1847 | /* | |
1848 | * It is now safe to initialize the global tunings which rely on | |
1849 | * the use of the for_each_zone() macro. This macro in turns | |
1850 | * depends on the *_pgdat symbols which are now available. | |
1851 | */ | |
1852 | spl_kmem_init_globals(); | |
1853 | ||
1854 | return 0; | |
1855 | } | |
1856 | ||
a1502d76 BB |
1857 | int |
1858 | spl_kmem_init(void) | |
1859 | { | |
1860 | int rc = 0; | |
1861 | ENTRY; | |
1862 | ||
1863 | init_rwsem(&spl_kmem_cache_sem); | |
1864 | INIT_LIST_HEAD(&spl_kmem_cache_list); | |
1865 | ||
1866 | #ifdef HAVE_SET_SHRINKER | |
1867 | spl_kmem_cache_shrinker = set_shrinker(KMC_DEFAULT_SEEKS, | |
1868 | spl_kmem_cache_generic_shrinker); | |
1869 | if (spl_kmem_cache_shrinker == NULL) | |
f78a933f | 1870 | RETURN(rc = -ENOMEM); |
a1502d76 BB |
1871 | #else |
1872 | register_shrinker(&spl_kmem_cache_shrinker); | |
1873 | #endif | |
1874 | ||
1875 | #ifdef DEBUG_KMEM | |
1876 | atomic64_set(&kmem_alloc_used, 0); | |
1877 | atomic64_set(&vmem_alloc_used, 0); | |
1878 | ||
1879 | spl_kmem_init_tracking(&kmem_list, &kmem_lock, KMEM_TABLE_SIZE); | |
1880 | spl_kmem_init_tracking(&vmem_list, &vmem_lock, VMEM_TABLE_SIZE); | |
1881 | #endif | |
a1502d76 BB |
1882 | RETURN(rc); |
1883 | } | |
1884 | ||
ff449ac4 BB |
1885 | void |
1886 | spl_kmem_fini(void) | |
1887 | { | |
1888 | #ifdef DEBUG_KMEM | |
1889 | /* Display all unreclaimed memory addresses, including the | |
1890 | * allocation size and the first few bytes of what's located | |
1891 | * at that address to aid in debugging. Performance is not | |
1892 | * a serious concern here since it is module unload time. */ | |
1893 | if (atomic64_read(&kmem_alloc_used) != 0) | |
1894 | CWARN("kmem leaked %ld/%ld bytes\n", | |
550f1705 | 1895 | atomic64_read(&kmem_alloc_used), kmem_alloc_max); |
ff449ac4 | 1896 | |
2fb9b26a BB |
1897 | |
1898 | if (atomic64_read(&vmem_alloc_used) != 0) | |
1899 | CWARN("vmem leaked %ld/%ld bytes\n", | |
550f1705 | 1900 | atomic64_read(&vmem_alloc_used), vmem_alloc_max); |
2fb9b26a | 1901 | |
ff449ac4 BB |
1902 | spl_kmem_fini_tracking(&kmem_list, &kmem_lock); |
1903 | spl_kmem_fini_tracking(&vmem_list, &vmem_lock); | |
1904 | #endif /* DEBUG_KMEM */ | |
2fb9b26a BB |
1905 | ENTRY; |
1906 | ||
1907 | #ifdef HAVE_SET_SHRINKER | |
1908 | remove_shrinker(spl_kmem_cache_shrinker); | |
1909 | #else | |
1910 | unregister_shrinker(&spl_kmem_cache_shrinker); | |
5d86345d | 1911 | #endif |
2fb9b26a | 1912 | |
937879f1 | 1913 | EXIT; |
5d86345d | 1914 | } |