2 * Copyright (c) 2005 Jeffrey M. Hsu. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of The DragonFly Project nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific, prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $DragonFly: src/sys/kern/kern_objcache.c,v 1.18 2007/04/30 07:18:53 dillon Exp $
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/systm.h>
38 #include <sys/callout.h>
39 #include <sys/globaldata.h>
40 #include <sys/malloc.h>
41 #include <sys/queue.h>
42 #include <sys/objcache.h>
43 #include <sys/spinlock.h>
44 #include <sys/thread.h>
45 #include <sys/thread2.h>
46 #include <sys/spinlock2.h>
48 static MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
49 static MALLOC_DEFINE(M_OBJMAG, "objcache magazine", "Object Cache Magazine");
51 #define INITIAL_MAG_CAPACITY 256
57 SLIST_ENTRY(magazine) nextmagazine;
61 SLIST_HEAD(magazinelist, magazine);
64 * per-cluster cache of magazines
66 * All fields in this structure are protected by the spinlock.
68 struct magazinedepot {
70 * The per-cpu object caches only exchanges completely full or
71 * completely empty magazines with the depot layer, so only have
72 * to cache these two types of magazines.
74 struct magazinelist fullmagazines;
75 struct magazinelist emptymagazines;
78 /* protect this structure */
81 /* magazines not yet allocated towards limit */
82 int unallocated_objects;
84 /* infrequently used fields */
85 int waiting; /* waiting for another cpu to
86 * return a full magazine to
88 int contested; /* depot contention count */
92 * per-cpu object cache
93 * All fields in this structure are protected by crit_enter().
95 struct percpu_objcache {
96 struct magazine *loaded_magazine; /* active magazine */
97 struct magazine *previous_magazine; /* backup magazine */
100 int gets_cumulative; /* total calls to get */
101 int gets_null; /* objcache_get returned NULL */
102 int puts_cumulative; /* total calls to put */
103 int puts_othercluster; /* returned to other cluster */
105 /* infrequently used fields */
106 int waiting; /* waiting for a thread on this cpu to
107 * return an obj to the per-cpu cache */
110 /* only until we have NUMA cluster topology information XXX */
111 #define MAXCLUSTERS 1
112 #define myclusterid 0
113 #define CLUSTER_OF(obj) 0
116 * Two-level object cache consisting of NUMA cluster-level depots of
117 * fully loaded or completely empty magazines and cpu-level caches of
118 * individual objects.
123 /* object constructor and destructor from blank storage */
124 objcache_ctor_fn *ctor;
125 objcache_dtor_fn *dtor;
128 /* interface to underlying allocator */
129 objcache_alloc_fn *alloc;
130 objcache_free_fn *free;
131 void *allocator_args;
133 SLIST_ENTRY(objcache) oc_next;
135 /* NUMA-cluster level caches */
136 struct magazinedepot depot[MAXCLUSTERS];
138 struct percpu_objcache cache_percpu[]; /* per-cpu caches */
141 static struct spinlock objcachelist_spin;
142 static SLIST_HEAD(objcachelist, objcache) allobjcaches;
144 static struct magazine *
145 mag_alloc(int capacity)
147 struct magazine *mag;
149 mag = kmalloc(__offsetof(struct magazine, objects[capacity]),
150 M_OBJMAG, M_INTWAIT | M_ZERO);
151 mag->capacity = capacity;
158 * Utility routine for objects that don't require any de-construction.
162 null_dtor(void *obj, void *private)
168 null_ctor(void *obj, void *private, int ocflags)
174 * Create an object cache.
177 objcache_create(const char *name, int cluster_limit, int mag_capacity,
178 objcache_ctor_fn *ctor, objcache_dtor_fn *dtor, void *private,
179 objcache_alloc_fn *alloc, objcache_free_fn *free,
180 void *allocator_args)
183 struct magazinedepot *depot;
186 /* allocate object cache structure */
187 oc = kmalloc(__offsetof(struct objcache, cache_percpu[ncpus]),
188 M_OBJCACHE, M_WAITOK | M_ZERO);
189 oc->name = kstrdup(name, M_TEMP);
190 oc->ctor = ctor ? ctor : null_ctor;
191 oc->dtor = dtor ? dtor : null_dtor;
192 oc->private = private;
194 oc->allocator_args = allocator_args;
196 /* initialize depots */
197 depot = &oc->depot[0];
199 spin_init(&depot->spin);
200 SLIST_INIT(&depot->fullmagazines);
201 SLIST_INIT(&depot->emptymagazines);
203 if (mag_capacity == 0)
204 mag_capacity = INITIAL_MAG_CAPACITY;
205 depot->magcapacity = mag_capacity;
208 * The cluster_limit must be sufficient to have three magazines per
211 if (cluster_limit == 0) {
212 depot->unallocated_objects = -1;
214 if (cluster_limit < mag_capacity * ncpus * 3)
215 cluster_limit = mag_capacity * ncpus * 3;
216 depot->unallocated_objects = cluster_limit;
220 /* initialize per-cpu caches */
221 for (cpuid = 0; cpuid < ncpus; cpuid++) {
222 struct percpu_objcache *cache_percpu = &oc->cache_percpu[cpuid];
224 cache_percpu->loaded_magazine = mag_alloc(mag_capacity);
225 cache_percpu->previous_magazine = mag_alloc(mag_capacity);
227 spin_lock_wr(&objcachelist_spin);
228 SLIST_INSERT_HEAD(&allobjcaches, oc, oc_next);
229 spin_unlock_wr(&objcachelist_spin);
235 objcache_create_simple(malloc_type_t mtype, size_t objsize)
237 struct objcache_malloc_args *margs;
240 margs = kmalloc(sizeof(*margs), M_OBJCACHE, M_WAITOK|M_ZERO);
241 margs->objsize = objsize;
242 margs->mtype = mtype;
243 oc = objcache_create(mtype->ks_shortdesc, 0, 0,
245 objcache_malloc_alloc, objcache_malloc_free,
251 objcache_create_mbacked(malloc_type_t mtype, size_t objsize,
252 int cluster_limit, int mag_capacity,
253 objcache_ctor_fn *ctor, objcache_dtor_fn *dtor,
256 struct objcache_malloc_args *margs;
259 margs = kmalloc(sizeof(*margs), M_OBJCACHE, M_WAITOK|M_ZERO);
260 margs->objsize = objsize;
261 margs->mtype = mtype;
262 oc = objcache_create(mtype->ks_shortdesc,
263 cluster_limit, mag_capacity,
265 objcache_malloc_alloc, objcache_malloc_free,
271 #define MAGAZINE_EMPTY(mag) (mag->rounds == 0)
272 #define MAGAZINE_NOTEMPTY(mag) (mag->rounds != 0)
273 #define MAGAZINE_FULL(mag) (mag->rounds == mag->capacity)
275 #define swap(x, y) ({ struct magazine *t = x; x = y; y = t; })
278 * Get an object from the object cache.
280 * WARNING! ocflags are only used when we have to go to the underlying
281 * allocator, so we cannot depend on flags such as M_ZERO.
284 objcache_get(struct objcache *oc, int ocflags)
286 struct percpu_objcache *cpucache = &oc->cache_percpu[mycpuid];
287 struct magazine *loadedmag;
288 struct magazine *emptymag;
290 struct magazinedepot *depot;
292 KKASSERT((ocflags & M_ZERO) == 0);
294 ++cpucache->gets_cumulative;
298 * Loaded magazine has an object. This is the hot path.
299 * It is lock-free and uses a critical section to block
300 * out interrupt handlers on the same processor.
302 loadedmag = cpucache->loaded_magazine;
303 if (MAGAZINE_NOTEMPTY(loadedmag)) {
304 obj = loadedmag->objects[--loadedmag->rounds];
309 /* Previous magazine has an object. */
310 if (MAGAZINE_NOTEMPTY(cpucache->previous_magazine)) {
311 KKASSERT(cpucache->previous_magazine->cleaning +
312 cpucache->loaded_magazine->cleaning == 0);
313 swap(cpucache->loaded_magazine, cpucache->previous_magazine);
314 loadedmag = cpucache->loaded_magazine;
315 obj = loadedmag->objects[--loadedmag->rounds];
321 * Both magazines empty. Get a full magazine from the depot and
322 * move one of the empty ones to the depot.
324 * Obtain the depot spinlock.
326 * NOTE: Beyond this point, M_* flags are handled via oc->alloc()
328 depot = &oc->depot[myclusterid];
329 spin_lock_wr(&depot->spin);
332 * Recheck the cpucache after obtaining the depot spinlock. This
333 * shouldn't be necessary now but don't take any chances.
335 if (MAGAZINE_NOTEMPTY(cpucache->loaded_magazine) ||
336 MAGAZINE_NOTEMPTY(cpucache->previous_magazine)
338 spin_unlock_wr(&depot->spin);
342 /* Check if depot has a full magazine. */
343 if (!SLIST_EMPTY(&depot->fullmagazines)) {
344 emptymag = cpucache->previous_magazine;
345 cpucache->previous_magazine = cpucache->loaded_magazine;
346 cpucache->loaded_magazine = SLIST_FIRST(&depot->fullmagazines);
347 SLIST_REMOVE_HEAD(&depot->fullmagazines, nextmagazine);
350 * Return emptymag to the depot.
352 KKASSERT(MAGAZINE_EMPTY(emptymag));
353 SLIST_INSERT_HEAD(&depot->emptymagazines,
354 emptymag, nextmagazine);
355 spin_unlock_wr(&depot->spin);
360 * The depot does not have any non-empty magazines. If we have
361 * not hit our object limit we can allocate a new object using
362 * the back-end allocator.
364 * note: unallocated_objects can be initialized to -1, which has
365 * the effect of removing any allocation limits.
367 if (depot->unallocated_objects) {
368 --depot->unallocated_objects;
369 spin_unlock_wr(&depot->spin);
372 obj = oc->alloc(oc->allocator_args, ocflags);
374 if (oc->ctor(obj, oc->private, ocflags))
376 oc->free(obj, oc->allocator_args);
377 spin_lock_wr(&depot->spin);
378 ++depot->unallocated_objects;
379 spin_unlock_wr(&depot->spin);
387 * makes debugging easier when gets_cumulative does
388 * not include gets_null.
390 ++cpucache->gets_null;
391 --cpucache->gets_cumulative;
398 * Otherwise block if allowed to.
400 if ((ocflags & (M_WAITOK|M_NULLOK)) == M_WAITOK) {
403 msleep(depot, &depot->spin, 0, "objcache_get", 0);
406 spin_unlock_wr(&depot->spin);
413 ++cpucache->gets_null;
414 --cpucache->gets_cumulative;
416 spin_unlock_wr(&depot->spin);
421 * Wrapper for malloc allocation routines.
424 objcache_malloc_alloc(void *allocator_args, int ocflags)
426 struct objcache_malloc_args *alloc_args = allocator_args;
428 return (kmalloc(alloc_args->objsize, alloc_args->mtype,
429 ocflags & OC_MFLAGS));
433 objcache_malloc_free(void *obj, void *allocator_args)
435 struct objcache_malloc_args *alloc_args = allocator_args;
437 kfree(obj, alloc_args->mtype);
441 * Wrapper for allocation policies that pre-allocate at initialization time
442 * and don't do run-time allocation.
445 objcache_nop_alloc(void *allocator_args, int ocflags)
451 objcache_nop_free(void *obj, void *allocator_args)
456 * Return an object to the object cache.
459 objcache_put(struct objcache *oc, void *obj)
461 struct percpu_objcache *cpucache = &oc->cache_percpu[mycpuid];
462 struct magazine *loadedmag;
463 struct magazinedepot *depot;
466 ++cpucache->puts_cumulative;
468 if (CLUSTER_OF(obj) != myclusterid) {
470 /* use lazy IPI to send object to owning cluster XXX todo */
471 ++cpucache->puts_othercluster;
479 * Free slot available in loaded magazine. This is the hot path.
480 * It is lock-free and uses a critical section to block out interrupt
481 * handlers on the same processor.
483 loadedmag = cpucache->loaded_magazine;
484 if (!MAGAZINE_FULL(loadedmag)) {
485 loadedmag->objects[loadedmag->rounds++] = obj;
486 if (cpucache->waiting)
487 wakeup_mycpu(&oc->depot[myclusterid]);
493 * Current magazine full, but previous magazine has room. XXX
495 if (!MAGAZINE_FULL(cpucache->previous_magazine)) {
496 KKASSERT(cpucache->previous_magazine->cleaning +
497 cpucache->loaded_magazine->cleaning == 0);
498 swap(cpucache->loaded_magazine, cpucache->previous_magazine);
499 loadedmag = cpucache->loaded_magazine;
500 loadedmag->objects[loadedmag->rounds++] = obj;
501 if (cpucache->waiting)
502 wakeup_mycpu(&oc->depot[myclusterid]);
508 * Both magazines full. Get an empty magazine from the depot and
509 * move a full loaded magazine to the depot. Even though the
510 * magazine may wind up with space available after we block on
511 * the spinlock, we still cycle it through to avoid the non-optimal
514 * Obtain the depot spinlock.
516 depot = &oc->depot[myclusterid];
517 spin_lock_wr(&depot->spin);
520 * If an empty magazine is available in the depot, cycle it
523 if (!SLIST_EMPTY(&depot->emptymagazines)) {
524 KKASSERT(cpucache->previous_magazine->cleaning +
525 cpucache->loaded_magazine->cleaning == 0);
526 loadedmag = cpucache->previous_magazine;
527 cpucache->previous_magazine = cpucache->loaded_magazine;
528 cpucache->loaded_magazine = SLIST_FIRST(&depot->emptymagazines);
529 SLIST_REMOVE_HEAD(&depot->emptymagazines, nextmagazine);
532 * Return loadedmag to the depot. Due to blocking it may
533 * not be entirely full and could even be empty.
535 if (MAGAZINE_EMPTY(loadedmag)) {
536 SLIST_INSERT_HEAD(&depot->emptymagazines,
537 loadedmag, nextmagazine);
538 spin_unlock_wr(&depot->spin);
540 SLIST_INSERT_HEAD(&depot->fullmagazines,
541 loadedmag, nextmagazine);
542 spin_unlock_wr(&depot->spin);
550 * An empty mag is not available. This is a corner case which can
551 * occur due to cpus holding partially full magazines. Do not try
552 * to allocate a mag, just free the object.
554 ++depot->unallocated_objects;
555 spin_unlock_wr(&depot->spin);
559 oc->dtor(obj, oc->private);
560 oc->free(obj, oc->allocator_args);
564 * The object is being put back into the cache, but the caller has
565 * indicated that the object is not in any shape to be reused and should
566 * be dtor'd immediately.
569 objcache_dtor(struct objcache *oc, void *obj)
571 struct magazinedepot *depot;
573 depot = &oc->depot[myclusterid];
574 spin_lock_wr(&depot->spin);
575 ++depot->unallocated_objects;
576 spin_unlock_wr(&depot->spin);
579 oc->dtor(obj, oc->private);
580 oc->free(obj, oc->allocator_args);
584 * Deallocate all objects in a magazine and free the magazine if requested.
585 * The magazine must already be disassociated from the depot.
587 * Must be called with a critical section held when called with a per-cpu
588 * magazine. The magazine may be indirectly modified during the loop.
590 * The number of objects freed is returned.
593 mag_purge(struct objcache *oc, struct magazine *mag, int freeit)
600 while (mag->rounds) {
601 obj = mag->objects[--mag->rounds];
602 oc->dtor(obj, oc->private); /* MAY BLOCK */
603 oc->free(obj, oc->allocator_args); /* MAY BLOCK */
607 * Cycle for interrupts
609 if ((count & 15) == 0) {
616 kfree(mag, M_OBJMAG);
621 * Disassociate zero or more magazines from a magazine list associated with
622 * the depot, update the depot, and move the magazines to a temporary
625 * The caller must check the depot for waiters and wake it up, typically
626 * after disposing of the magazines this function loads onto the temporary
630 maglist_disassociate(struct magazinedepot *depot, struct magazinelist *maglist,
631 struct magazinelist *tmplist, boolean_t purgeall)
633 struct magazine *mag;
635 while ((mag = SLIST_FIRST(maglist)) != NULL) {
636 SLIST_REMOVE_HEAD(maglist, nextmagazine);
637 SLIST_INSERT_HEAD(tmplist, mag, nextmagazine);
638 depot->unallocated_objects += mag->rounds;
643 * Deallocate all magazines and their contents from the passed temporary
644 * list. The magazines have already been accounted for by their depots.
646 * The total number of rounds freed is returned. This number is typically
647 * only used to determine whether a wakeup on the depot is needed or not.
650 maglist_purge(struct objcache *oc, struct magazinelist *maglist)
652 struct magazine *mag;
656 * can't use SLIST_FOREACH because blocking releases the depot
659 while ((mag = SLIST_FIRST(maglist)) != NULL) {
660 SLIST_REMOVE_HEAD(maglist, nextmagazine);
661 count += mag_purge(oc, mag, TRUE);
667 * De-allocates all magazines on the full and empty magazine lists.
669 * Because this routine is called with a spinlock held, the magazines
670 * can only be disassociated and moved to a temporary list, not freed.
672 * The caller is responsible for freeing the magazines.
675 depot_disassociate(struct magazinedepot *depot, struct magazinelist *tmplist)
677 maglist_disassociate(depot, &depot->fullmagazines, tmplist, TRUE);
678 maglist_disassociate(depot, &depot->emptymagazines, tmplist, TRUE);
683 objcache_reclaim(struct objcache *oc)
685 struct percpu_objcache *cache_percpu = &oc->cache_percpu[myclusterid];
686 struct magazinedepot *depot = &oc->depot[myclusterid];
687 struct magazinelist tmplist;
690 SLIST_INIT(&tmplist);
692 count = mag_purge(oc, cache_percpu->loaded_magazine, FALSE);
693 count += mag_purge(oc, cache_percpu->previous_magazine, FALSE);
696 spin_lock_wr(&depot->spin);
697 depot->unallocated_objects += count;
698 depot_disassociate(depot, &tmplist);
699 spin_unlock_wr(&depot->spin);
700 count += maglist_purge(oc, &tmplist);
701 if (count && depot->waiting)
707 * Try to free up some memory. Return as soon as some free memory is found.
708 * For each object cache on the reclaim list, first try the current per-cpu
709 * cache, then the full magazine depot.
712 objcache_reclaimlist(struct objcache *oclist[], int nlist, int ocflags)
715 struct percpu_objcache *cpucache;
716 struct magazinedepot *depot;
717 struct magazinelist tmplist;
720 SLIST_INIT(&tmplist);
722 for (i = 0; i < nlist; i++) {
724 cpucache = &oc->cache_percpu[mycpuid];
725 depot = &oc->depot[myclusterid];
728 count = mag_purge(oc, cpucache->loaded_magazine, FALSE);
730 count += mag_purge(oc, cpucache->previous_magazine, FALSE);
733 spin_lock_wr(&depot->spin);
734 depot->unallocated_objects += count;
735 spin_unlock_wr(&depot->spin);
740 spin_lock_wr(&depot->spin);
741 maglist_disassociate(depot, &depot->fullmagazines,
743 spin_unlock_wr(&depot->spin);
744 count = maglist_purge(oc, &tmplist);
755 * Destroy an object cache. Must have no existing references.
758 objcache_destroy(struct objcache *oc)
760 struct percpu_objcache *cache_percpu;
761 struct magazinedepot *depot;
762 int clusterid, cpuid;
763 struct magazinelist tmplist;
765 SLIST_INIT(&tmplist);
766 for (clusterid = 0; clusterid < MAXCLUSTERS; clusterid++) {
767 depot = &oc->depot[clusterid];
768 spin_lock_wr(&depot->spin);
769 depot_disassociate(depot, &tmplist);
770 spin_unlock_wr(&depot->spin);
772 maglist_purge(oc, &tmplist);
774 for (cpuid = 0; cpuid < ncpus; cpuid++) {
775 cache_percpu = &oc->cache_percpu[cpuid];
777 mag_purge(oc, cache_percpu->loaded_magazine, TRUE);
778 mag_purge(oc, cache_percpu->previous_magazine, TRUE);
779 cache_percpu->loaded_magazine = NULL;
780 cache_percpu->previous_magazine = NULL;
781 /* don't bother adjusting depot->unallocated_objects */
784 kfree(oc->name, M_TEMP);
785 kfree(oc, M_OBJCACHE);
790 * Populate the per-cluster depot with elements from a linear block
791 * of memory. Must be called for individually for each cluster.
792 * Populated depots should not be destroyed.
795 objcache_populate_linear(struct objcache *oc, void *base, int nelts, int size)
798 char *end = (char *)base + (nelts * size);
799 struct magazinedepot *depot = &oc->depot[myclusterid];
800 struct magazine *emptymag = mag_alloc(depot->magcapcity);
803 emptymag->objects[emptymag->rounds++] = p;
804 if (MAGAZINE_FULL(emptymag)) {
805 spin_lock_wr(&depot->spin);
806 SLIST_INSERT_HEAD(&depot->fullmagazines, emptymag,
808 depot->unallocated_objects += emptymag->rounds;
809 spin_unlock_wr(&depot->spin);
812 emptymag = mag_alloc(depot->magcapacity);
816 if (MAGAZINE_EMPTY(emptymag)) {
817 mag_purge(oc, emptymag, TRUE);
819 spin_lock_wr(&depot->spin);
820 SLIST_INSERT_HEAD(&depot->fullmagazines, emptymag,
822 depot->unallocated_objects += emptymag->rounds;
823 spin_unlock_wr(&depot->spin);
826 emptymag = mag_alloc(depot->magcapacity);
833 * Check depot contention once a minute.
834 * 2 contested locks per second allowed.
836 static int objcache_rebalance_period;
837 static const int objcache_contention_rate = 120;
838 static struct callout objcache_callout;
840 #define MAXMAGSIZE 512
843 * Check depot contention and increase magazine size if necessary.
846 objcache_timer(void *dummy)
849 struct magazinedepot *depot;
850 struct magazinelist tmplist;
852 XXX we need to detect when an objcache is destroyed out from under
855 SLIST_INIT(&tmplist);
857 spin_lock_wr(&objcachelist_spin);
858 SLIST_FOREACH(oc, &allobjcaches, oc_next) {
859 depot = &oc->depot[myclusterid];
860 if (depot->magcapacity < MAXMAGSIZE) {
861 if (depot->contested > objcache_contention_rate) {
862 spin_lock_wr(&depot->spin);
863 depot_disassociate(depot, &tmplist);
864 depot->magcapacity *= 2;
865 spin_unlock_wr(&depot->spin);
866 kprintf("objcache_timer: increasing cache %s"
867 " magsize to %d, contested %d times\n",
868 oc->name, depot->magcapacity,
871 depot->contested = 0;
873 spin_unlock_wr(&objcachelist_spin);
874 if (maglist_purge(oc, &tmplist) > 0 && depot->waiting)
876 spin_lock_wr(&objcachelist_spin);
878 spin_unlock_wr(&objcachelist_spin);
880 callout_reset(&objcache_callout, objcache_rebalance_period,
881 objcache_timer, NULL);
889 spin_init(&objcachelist_spin);
891 callout_init(&objcache_callout);
892 objcache_rebalance_period = 60 * hz;
893 callout_reset(&objcache_callout, objcache_rebalance_period,
894 objcache_timer, NULL);
897 SYSINIT(objcache, SI_BOOT2_OBJCACHE, SI_ORDER_FIRST, objcache_init, 0);