2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2002-2019 Jeffrey Roberson <jeff@FreeBSD.org>
5 * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
6 * Copyright (c) 2004-2006 Robert N. M. Watson
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice unmodified, this list of conditions, and the following
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * uma_core.c Implementation of the Universal Memory allocator
34 * This allocator is intended to replace the multitude of similar object caches
35 * in the standard FreeBSD kernel. The intent is to be flexible as well as
36 * efficient. A primary design goal is to return unused memory to the rest of
37 * the system. This will make the system as a whole more flexible due to the
38 * ability to move memory to subsystems which most need it instead of leaving
39 * pools of reserved memory unused.
41 * The basic ideas stem from similar slab/zone based allocators whose algorithms
48 * - Improve memory usage for large allocations
49 * - Investigate cache size adjustments
52 #include <sys/cdefs.h>
53 __FBSDID("$FreeBSD$");
56 #include "opt_param.h"
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/bitset.h>
62 #include <sys/domainset.h>
63 #include <sys/eventhandler.h>
64 #include <sys/kernel.h>
65 #include <sys/types.h>
66 #include <sys/limits.h>
67 #include <sys/queue.h>
68 #include <sys/malloc.h>
71 #include <sys/sysctl.h>
72 #include <sys/mutex.h>
74 #include <sys/random.h>
75 #include <sys/rwlock.h>
77 #include <sys/sched.h>
78 #include <sys/sleepqueue.h>
81 #include <sys/taskqueue.h>
82 #include <sys/vmmeter.h>
85 #include <vm/vm_param.h>
86 #include <vm/vm_domainset.h>
87 #include <vm/vm_object.h>
88 #include <vm/vm_page.h>
89 #include <vm/vm_pageout.h>
90 #include <vm/vm_phys.h>
91 #include <vm/vm_pagequeue.h>
92 #include <vm/vm_map.h>
93 #include <vm/vm_kern.h>
94 #include <vm/vm_extern.h>
95 #include <vm/vm_dumpset.h>
97 #include <vm/uma_int.h>
98 #include <vm/uma_dbg.h>
102 #ifdef DEBUG_MEMGUARD
103 #include <vm/memguard.h>
106 #include <machine/md_var.h>
109 #define UMA_ALWAYS_CTORDTOR 1
111 #define UMA_ALWAYS_CTORDTOR 0
115 * This is the zone and keg from which all zones are spawned.
117 static uma_zone_t kegs;
118 static uma_zone_t zones;
121 * On INVARIANTS builds, the slab contains a second bitset of the same size,
122 * "dbg_bits", which is laid out immediately after us_free.
125 #define SLAB_BITSETS 2
127 #define SLAB_BITSETS 1
131 * These are the two zones from which all offpage uma_slab_ts are allocated.
133 * One zone is for slab headers that can represent a larger number of items,
134 * making the slabs themselves more efficient, and the other zone is for
135 * headers that are smaller and represent fewer items, making the headers more
138 #define SLABZONE_SIZE(setsize) \
139 (sizeof(struct uma_hash_slab) + BITSET_SIZE(setsize) * SLAB_BITSETS)
140 #define SLABZONE0_SETSIZE (PAGE_SIZE / 16)
141 #define SLABZONE1_SETSIZE SLAB_MAX_SETSIZE
142 #define SLABZONE0_SIZE SLABZONE_SIZE(SLABZONE0_SETSIZE)
143 #define SLABZONE1_SIZE SLABZONE_SIZE(SLABZONE1_SETSIZE)
144 static uma_zone_t slabzones[2];
147 * The initial hash tables come out of this zone so they can be allocated
148 * prior to malloc coming up.
150 static uma_zone_t hashzone;
152 /* The boot-time adjusted value for cache line alignment. */
153 int uma_align_cache = 64 - 1;
155 static MALLOC_DEFINE(M_UMAHASH, "UMAHash", "UMA Hash Buckets");
156 static MALLOC_DEFINE(M_UMA, "UMA", "UMA Misc");
159 * Are we allowed to allocate buckets?
161 static int bucketdisable = 1;
163 /* Linked list of all kegs in the system */
164 static LIST_HEAD(,uma_keg) uma_kegs = LIST_HEAD_INITIALIZER(uma_kegs);
166 /* Linked list of all cache-only zones in the system */
167 static LIST_HEAD(,uma_zone) uma_cachezones =
168 LIST_HEAD_INITIALIZER(uma_cachezones);
170 /* This RW lock protects the keg list */
171 static struct rwlock_padalign __exclusive_cache_line uma_rwlock;
174 * First available virual address for boot time allocations.
176 static vm_offset_t bootstart;
177 static vm_offset_t bootmem;
179 static struct sx uma_reclaim_lock;
182 * kmem soft limit, initialized by uma_set_limit(). Ensure that early
183 * allocations don't trigger a wakeup of the reclaim thread.
185 unsigned long uma_kmem_limit = LONG_MAX;
186 SYSCTL_ULONG(_vm, OID_AUTO, uma_kmem_limit, CTLFLAG_RD, &uma_kmem_limit, 0,
187 "UMA kernel memory soft limit");
188 unsigned long uma_kmem_total;
189 SYSCTL_ULONG(_vm, OID_AUTO, uma_kmem_total, CTLFLAG_RD, &uma_kmem_total, 0,
190 "UMA kernel memory usage");
192 /* Is the VM done starting up? */
199 } booted = BOOT_COLD;
202 * This is the handle used to schedule events that need to happen
203 * outside of the allocation fast path.
205 static struct callout uma_callout;
206 #define UMA_TIMEOUT 20 /* Seconds for callout interval. */
209 * This structure is passed as the zone ctor arg so that I don't have to create
210 * a special allocation function just for zones.
212 struct uma_zctor_args {
227 struct uma_kctor_args {
236 struct uma_bucket_zone {
238 const char *ubz_name;
239 int ubz_entries; /* Number of items it can hold. */
240 int ubz_maxsize; /* Maximum allocation size per-item. */
244 * Compute the actual number of bucket entries to pack them in power
245 * of two sizes for more efficient space utilization.
247 #define BUCKET_SIZE(n) \
248 (((sizeof(void *) * (n)) - sizeof(struct uma_bucket)) / sizeof(void *))
250 #define BUCKET_MAX BUCKET_SIZE(256)
252 struct uma_bucket_zone bucket_zones[] = {
253 /* Literal bucket sizes. */
254 { NULL, "2 Bucket", 2, 4096 },
255 { NULL, "4 Bucket", 4, 3072 },
256 { NULL, "8 Bucket", 8, 2048 },
257 { NULL, "16 Bucket", 16, 1024 },
258 /* Rounded down power of 2 sizes for efficiency. */
259 { NULL, "32 Bucket", BUCKET_SIZE(32), 512 },
260 { NULL, "64 Bucket", BUCKET_SIZE(64), 256 },
261 { NULL, "128 Bucket", BUCKET_SIZE(128), 128 },
262 { NULL, "256 Bucket", BUCKET_SIZE(256), 64 },
267 * Flags and enumerations to be passed to internal functions.
271 SKIP_CNT = 0x00000001,
272 SKIP_DTOR = 0x00010000,
273 SKIP_FINI = 0x00020000,
278 void uma_startup1(vm_offset_t);
279 void uma_startup2(void);
281 static void *noobj_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
282 static void *page_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
283 static void *pcpu_page_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
284 static void *startup_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
285 static void *contig_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
286 static void page_free(void *, vm_size_t, uint8_t);
287 static void pcpu_page_free(void *, vm_size_t, uint8_t);
288 static uma_slab_t keg_alloc_slab(uma_keg_t, uma_zone_t, int, int, int);
289 static void cache_drain(uma_zone_t);
290 static void bucket_drain(uma_zone_t, uma_bucket_t);
291 static void bucket_cache_reclaim(uma_zone_t zone, bool);
292 static int keg_ctor(void *, int, void *, int);
293 static void keg_dtor(void *, int, void *);
294 static int zone_ctor(void *, int, void *, int);
295 static void zone_dtor(void *, int, void *);
296 static inline void item_dtor(uma_zone_t zone, void *item, int size,
297 void *udata, enum zfreeskip skip);
298 static int zero_init(void *, int, int);
299 static void zone_free_bucket(uma_zone_t zone, uma_bucket_t bucket, void *udata,
300 int itemdomain, bool ws);
301 static void zone_foreach(void (*zfunc)(uma_zone_t, void *), void *);
302 static void zone_foreach_unlocked(void (*zfunc)(uma_zone_t, void *), void *);
303 static void zone_timeout(uma_zone_t zone, void *);
304 static int hash_alloc(struct uma_hash *, u_int);
305 static int hash_expand(struct uma_hash *, struct uma_hash *);
306 static void hash_free(struct uma_hash *hash);
307 static void uma_timeout(void *);
308 static void uma_shutdown(void);
309 static void *zone_alloc_item(uma_zone_t, void *, int, int);
310 static void zone_free_item(uma_zone_t, void *, void *, enum zfreeskip);
311 static int zone_alloc_limit(uma_zone_t zone, int count, int flags);
312 static void zone_free_limit(uma_zone_t zone, int count);
313 static void bucket_enable(void);
314 static void bucket_init(void);
315 static uma_bucket_t bucket_alloc(uma_zone_t zone, void *, int);
316 static void bucket_free(uma_zone_t zone, uma_bucket_t, void *);
317 static void bucket_zone_drain(void);
318 static uma_bucket_t zone_alloc_bucket(uma_zone_t, void *, int, int);
319 static void *slab_alloc_item(uma_keg_t keg, uma_slab_t slab);
320 static void slab_free_item(uma_zone_t zone, uma_slab_t slab, void *item);
321 static uma_keg_t uma_kcreate(uma_zone_t zone, size_t size, uma_init uminit,
322 uma_fini fini, int align, uint32_t flags);
323 static int zone_import(void *, void **, int, int, int);
324 static void zone_release(void *, void **, int);
325 static bool cache_alloc(uma_zone_t, uma_cache_t, void *, int);
326 static bool cache_free(uma_zone_t, uma_cache_t, void *, void *, int);
328 static int sysctl_vm_zone_count(SYSCTL_HANDLER_ARGS);
329 static int sysctl_vm_zone_stats(SYSCTL_HANDLER_ARGS);
330 static int sysctl_handle_uma_zone_allocs(SYSCTL_HANDLER_ARGS);
331 static int sysctl_handle_uma_zone_frees(SYSCTL_HANDLER_ARGS);
332 static int sysctl_handle_uma_zone_flags(SYSCTL_HANDLER_ARGS);
333 static int sysctl_handle_uma_slab_efficiency(SYSCTL_HANDLER_ARGS);
334 static int sysctl_handle_uma_zone_items(SYSCTL_HANDLER_ARGS);
336 static uint64_t uma_zone_get_allocs(uma_zone_t zone);
338 static SYSCTL_NODE(_vm, OID_AUTO, debug, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
339 "Memory allocation debugging");
342 static uint64_t uma_keg_get_allocs(uma_keg_t zone);
343 static inline struct noslabbits *slab_dbg_bits(uma_slab_t slab, uma_keg_t keg);
345 static bool uma_dbg_kskip(uma_keg_t keg, void *mem);
346 static bool uma_dbg_zskip(uma_zone_t zone, void *mem);
347 static void uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item);
348 static void uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item);
350 static u_int dbg_divisor = 1;
351 SYSCTL_UINT(_vm_debug, OID_AUTO, divisor,
352 CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &dbg_divisor, 0,
353 "Debug & thrash every this item in memory allocator");
355 static counter_u64_t uma_dbg_cnt = EARLY_COUNTER;
356 static counter_u64_t uma_skip_cnt = EARLY_COUNTER;
357 SYSCTL_COUNTER_U64(_vm_debug, OID_AUTO, trashed, CTLFLAG_RD,
358 &uma_dbg_cnt, "memory items debugged");
359 SYSCTL_COUNTER_U64(_vm_debug, OID_AUTO, skipped, CTLFLAG_RD,
360 &uma_skip_cnt, "memory items skipped, not debugged");
363 SYSCTL_NODE(_vm, OID_AUTO, uma, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
364 "Universal Memory Allocator");
366 SYSCTL_PROC(_vm, OID_AUTO, zone_count, CTLFLAG_RD|CTLFLAG_MPSAFE|CTLTYPE_INT,
367 0, 0, sysctl_vm_zone_count, "I", "Number of UMA zones");
369 SYSCTL_PROC(_vm, OID_AUTO, zone_stats, CTLFLAG_RD|CTLFLAG_MPSAFE|CTLTYPE_STRUCT,
370 0, 0, sysctl_vm_zone_stats, "s,struct uma_type_header", "Zone Stats");
372 static int zone_warnings = 1;
373 SYSCTL_INT(_vm, OID_AUTO, zone_warnings, CTLFLAG_RWTUN, &zone_warnings, 0,
374 "Warn when UMA zones becomes full");
376 static int multipage_slabs = 1;
377 TUNABLE_INT("vm.debug.uma_multipage_slabs", &multipage_slabs);
378 SYSCTL_INT(_vm_debug, OID_AUTO, uma_multipage_slabs,
379 CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &multipage_slabs, 0,
380 "UMA may choose larger slab sizes for better efficiency");
383 * Select the slab zone for an offpage slab with the given maximum item count.
385 static inline uma_zone_t
389 return (slabzones[ipers > SLABZONE0_SETSIZE]);
393 * This routine checks to see whether or not it's safe to enable buckets.
399 KASSERT(booted >= BOOT_KVA, ("Bucket enable before init"));
400 bucketdisable = vm_page_count_min();
404 * Initialize bucket_zones, the array of zones of buckets of various sizes.
406 * For each zone, calculate the memory required for each bucket, consisting
407 * of the header and an array of pointers.
412 struct uma_bucket_zone *ubz;
415 for (ubz = &bucket_zones[0]; ubz->ubz_entries != 0; ubz++) {
416 size = roundup(sizeof(struct uma_bucket), sizeof(void *));
417 size += sizeof(void *) * ubz->ubz_entries;
418 ubz->ubz_zone = uma_zcreate(ubz->ubz_name, size,
419 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
420 UMA_ZONE_MTXCLASS | UMA_ZFLAG_BUCKET |
421 UMA_ZONE_FIRSTTOUCH);
426 * Given a desired number of entries for a bucket, return the zone from which
427 * to allocate the bucket.
429 static struct uma_bucket_zone *
430 bucket_zone_lookup(int entries)
432 struct uma_bucket_zone *ubz;
434 for (ubz = &bucket_zones[0]; ubz->ubz_entries != 0; ubz++)
435 if (ubz->ubz_entries >= entries)
442 bucket_select(int size)
444 struct uma_bucket_zone *ubz;
446 ubz = &bucket_zones[0];
447 if (size > ubz->ubz_maxsize)
448 return MAX((ubz->ubz_maxsize * ubz->ubz_entries) / size, 1);
450 for (; ubz->ubz_entries != 0; ubz++)
451 if (ubz->ubz_maxsize < size)
454 return (ubz->ubz_entries);
458 bucket_alloc(uma_zone_t zone, void *udata, int flags)
460 struct uma_bucket_zone *ubz;
464 * Don't allocate buckets early in boot.
466 if (__predict_false(booted < BOOT_KVA))
470 * To limit bucket recursion we store the original zone flags
471 * in a cookie passed via zalloc_arg/zfree_arg. This allows the
472 * NOVM flag to persist even through deep recursions. We also
473 * store ZFLAG_BUCKET once we have recursed attempting to allocate
474 * a bucket for a bucket zone so we do not allow infinite bucket
475 * recursion. This cookie will even persist to frees of unused
476 * buckets via the allocation path or bucket allocations in the
479 if ((zone->uz_flags & UMA_ZFLAG_BUCKET) == 0)
480 udata = (void *)(uintptr_t)zone->uz_flags;
482 if ((uintptr_t)udata & UMA_ZFLAG_BUCKET)
484 udata = (void *)((uintptr_t)udata | UMA_ZFLAG_BUCKET);
486 if (((uintptr_t)udata & UMA_ZONE_VM) != 0)
488 ubz = bucket_zone_lookup(atomic_load_16(&zone->uz_bucket_size));
489 if (ubz->ubz_zone == zone && (ubz + 1)->ubz_entries != 0)
491 bucket = uma_zalloc_arg(ubz->ubz_zone, udata, flags);
494 bzero(bucket->ub_bucket, sizeof(void *) * ubz->ubz_entries);
497 bucket->ub_entries = min(ubz->ubz_entries,
498 zone->uz_bucket_size_max);
499 bucket->ub_seq = SMR_SEQ_INVALID;
500 CTR3(KTR_UMA, "bucket_alloc: zone %s(%p) allocated bucket %p",
501 zone->uz_name, zone, bucket);
508 bucket_free(uma_zone_t zone, uma_bucket_t bucket, void *udata)
510 struct uma_bucket_zone *ubz;
512 if (bucket->ub_cnt != 0)
513 bucket_drain(zone, bucket);
515 KASSERT(bucket->ub_cnt == 0,
516 ("bucket_free: Freeing a non free bucket."));
517 KASSERT(bucket->ub_seq == SMR_SEQ_INVALID,
518 ("bucket_free: Freeing an SMR bucket."));
519 if ((zone->uz_flags & UMA_ZFLAG_BUCKET) == 0)
520 udata = (void *)(uintptr_t)zone->uz_flags;
521 ubz = bucket_zone_lookup(bucket->ub_entries);
522 uma_zfree_arg(ubz->ubz_zone, bucket, udata);
526 bucket_zone_drain(void)
528 struct uma_bucket_zone *ubz;
530 for (ubz = &bucket_zones[0]; ubz->ubz_entries != 0; ubz++)
531 uma_zone_reclaim(ubz->ubz_zone, UMA_RECLAIM_DRAIN);
535 * Acquire the domain lock and record contention.
537 static uma_zone_domain_t
538 zone_domain_lock(uma_zone_t zone, int domain)
540 uma_zone_domain_t zdom;
543 zdom = ZDOM_GET(zone, domain);
545 if (ZDOM_OWNED(zdom))
548 /* This is unsynchronized. The counter does not need to be precise. */
549 if (lockfail && zone->uz_bucket_size < zone->uz_bucket_size_max)
550 zone->uz_bucket_size++;
555 * Search for the domain with the least cached items and return it if it
556 * is out of balance with the preferred domain.
558 static __noinline int
559 zone_domain_lowest(uma_zone_t zone, int pref)
561 long least, nitems, prefitems;
565 prefitems = least = LONG_MAX;
567 for (i = 0; i < vm_ndomains; i++) {
568 nitems = ZDOM_GET(zone, i)->uzd_nitems;
569 if (nitems < least) {
576 if (prefitems < least * 2)
583 * Search for the domain with the most cached items and return it or the
584 * preferred domain if it has enough to proceed.
586 static __noinline int
587 zone_domain_highest(uma_zone_t zone, int pref)
593 if (ZDOM_GET(zone, pref)->uzd_nitems > BUCKET_MAX)
598 for (i = 0; i < vm_ndomains; i++) {
599 nitems = ZDOM_GET(zone, i)->uzd_nitems;
610 * Safely subtract cnt from imax.
613 zone_domain_imax_sub(uma_zone_domain_t zdom, int cnt)
618 old = zdom->uzd_imax;
624 } while (atomic_fcmpset_long(&zdom->uzd_imax, &old, new) == 0);
628 * Set the maximum imax value.
631 zone_domain_imax_set(uma_zone_domain_t zdom, int nitems)
635 old = zdom->uzd_imax;
639 } while (atomic_fcmpset_long(&zdom->uzd_imax, &old, nitems) == 0);
643 * Attempt to satisfy an allocation by retrieving a full bucket from one of the
644 * zone's caches. If a bucket is found the zone is not locked on return.
647 zone_fetch_bucket(uma_zone_t zone, uma_zone_domain_t zdom, bool reclaim)
653 ZDOM_LOCK_ASSERT(zdom);
655 if ((bucket = STAILQ_FIRST(&zdom->uzd_buckets)) == NULL)
658 /* SMR Buckets can not be re-used until readers expire. */
659 if ((zone->uz_flags & UMA_ZONE_SMR) != 0 &&
660 bucket->ub_seq != SMR_SEQ_INVALID) {
661 if (!smr_poll(zone->uz_smr, bucket->ub_seq, false))
663 bucket->ub_seq = SMR_SEQ_INVALID;
664 dtor = (zone->uz_dtor != NULL) || UMA_ALWAYS_CTORDTOR;
665 if (STAILQ_NEXT(bucket, ub_link) != NULL)
666 zdom->uzd_seq = STAILQ_NEXT(bucket, ub_link)->ub_seq;
668 STAILQ_REMOVE_HEAD(&zdom->uzd_buckets, ub_link);
670 KASSERT(zdom->uzd_nitems >= bucket->ub_cnt,
671 ("%s: item count underflow (%ld, %d)",
672 __func__, zdom->uzd_nitems, bucket->ub_cnt));
673 KASSERT(bucket->ub_cnt > 0,
674 ("%s: empty bucket in bucket cache", __func__));
675 zdom->uzd_nitems -= bucket->ub_cnt;
678 * Shift the bounds of the current WSS interval to avoid
679 * perturbing the estimate.
682 zdom->uzd_imin -= lmin(zdom->uzd_imin, bucket->ub_cnt);
683 zone_domain_imax_sub(zdom, bucket->ub_cnt);
684 } else if (zdom->uzd_imin > zdom->uzd_nitems)
685 zdom->uzd_imin = zdom->uzd_nitems;
689 for (i = 0; i < bucket->ub_cnt; i++)
690 item_dtor(zone, bucket->ub_bucket[i], zone->uz_size,
697 * Insert a full bucket into the specified cache. The "ws" parameter indicates
698 * whether the bucket's contents should be counted as part of the zone's working
699 * set. The bucket may be freed if it exceeds the bucket limit.
702 zone_put_bucket(uma_zone_t zone, int domain, uma_bucket_t bucket, void *udata,
705 uma_zone_domain_t zdom;
707 /* We don't cache empty buckets. This can happen after a reclaim. */
708 if (bucket->ub_cnt == 0)
710 zdom = zone_domain_lock(zone, domain);
713 * Conditionally set the maximum number of items.
715 zdom->uzd_nitems += bucket->ub_cnt;
716 if (__predict_true(zdom->uzd_nitems < zone->uz_bucket_max)) {
718 zone_domain_imax_set(zdom, zdom->uzd_nitems);
719 if (STAILQ_EMPTY(&zdom->uzd_buckets))
720 zdom->uzd_seq = bucket->ub_seq;
723 * Try to promote reuse of recently used items. For items
724 * protected by SMR, try to defer reuse to minimize polling.
726 if (bucket->ub_seq == SMR_SEQ_INVALID)
727 STAILQ_INSERT_HEAD(&zdom->uzd_buckets, bucket, ub_link);
729 STAILQ_INSERT_TAIL(&zdom->uzd_buckets, bucket, ub_link);
733 zdom->uzd_nitems -= bucket->ub_cnt;
736 bucket_free(zone, bucket, udata);
739 /* Pops an item out of a per-cpu cache bucket. */
741 cache_bucket_pop(uma_cache_t cache, uma_cache_bucket_t bucket)
745 CRITICAL_ASSERT(curthread);
748 item = bucket->ucb_bucket->ub_bucket[bucket->ucb_cnt];
750 bucket->ucb_bucket->ub_bucket[bucket->ucb_cnt] = NULL;
751 KASSERT(item != NULL, ("uma_zalloc: Bucket pointer mangled."));
758 /* Pushes an item into a per-cpu cache bucket. */
760 cache_bucket_push(uma_cache_t cache, uma_cache_bucket_t bucket, void *item)
763 CRITICAL_ASSERT(curthread);
764 KASSERT(bucket->ucb_bucket->ub_bucket[bucket->ucb_cnt] == NULL,
765 ("uma_zfree: Freeing to non free bucket index."));
767 bucket->ucb_bucket->ub_bucket[bucket->ucb_cnt] = item;
773 * Unload a UMA bucket from a per-cpu cache.
775 static inline uma_bucket_t
776 cache_bucket_unload(uma_cache_bucket_t bucket)
780 b = bucket->ucb_bucket;
782 MPASS(b->ub_entries == bucket->ucb_entries);
783 b->ub_cnt = bucket->ucb_cnt;
784 bucket->ucb_bucket = NULL;
785 bucket->ucb_entries = bucket->ucb_cnt = 0;
791 static inline uma_bucket_t
792 cache_bucket_unload_alloc(uma_cache_t cache)
795 return (cache_bucket_unload(&cache->uc_allocbucket));
798 static inline uma_bucket_t
799 cache_bucket_unload_free(uma_cache_t cache)
802 return (cache_bucket_unload(&cache->uc_freebucket));
805 static inline uma_bucket_t
806 cache_bucket_unload_cross(uma_cache_t cache)
809 return (cache_bucket_unload(&cache->uc_crossbucket));
813 * Load a bucket into a per-cpu cache bucket.
816 cache_bucket_load(uma_cache_bucket_t bucket, uma_bucket_t b)
819 CRITICAL_ASSERT(curthread);
820 MPASS(bucket->ucb_bucket == NULL);
821 MPASS(b->ub_seq == SMR_SEQ_INVALID);
823 bucket->ucb_bucket = b;
824 bucket->ucb_cnt = b->ub_cnt;
825 bucket->ucb_entries = b->ub_entries;
829 cache_bucket_load_alloc(uma_cache_t cache, uma_bucket_t b)
832 cache_bucket_load(&cache->uc_allocbucket, b);
836 cache_bucket_load_free(uma_cache_t cache, uma_bucket_t b)
839 cache_bucket_load(&cache->uc_freebucket, b);
844 cache_bucket_load_cross(uma_cache_t cache, uma_bucket_t b)
847 cache_bucket_load(&cache->uc_crossbucket, b);
852 * Copy and preserve ucb_spare.
855 cache_bucket_copy(uma_cache_bucket_t b1, uma_cache_bucket_t b2)
858 b1->ucb_bucket = b2->ucb_bucket;
859 b1->ucb_entries = b2->ucb_entries;
860 b1->ucb_cnt = b2->ucb_cnt;
864 * Swap two cache buckets.
867 cache_bucket_swap(uma_cache_bucket_t b1, uma_cache_bucket_t b2)
869 struct uma_cache_bucket b3;
871 CRITICAL_ASSERT(curthread);
873 cache_bucket_copy(&b3, b1);
874 cache_bucket_copy(b1, b2);
875 cache_bucket_copy(b2, &b3);
879 * Attempt to fetch a bucket from a zone on behalf of the current cpu cache.
882 cache_fetch_bucket(uma_zone_t zone, uma_cache_t cache, int domain)
884 uma_zone_domain_t zdom;
888 * Avoid the lock if possible.
890 zdom = ZDOM_GET(zone, domain);
891 if (zdom->uzd_nitems == 0)
894 if ((cache_uz_flags(cache) & UMA_ZONE_SMR) != 0 &&
895 !smr_poll(zone->uz_smr, zdom->uzd_seq, false))
899 * Check the zone's cache of buckets.
901 zdom = zone_domain_lock(zone, domain);
902 if ((bucket = zone_fetch_bucket(zone, zdom, false)) != NULL)
910 zone_log_warning(uma_zone_t zone)
912 static const struct timeval warninterval = { 300, 0 };
914 if (!zone_warnings || zone->uz_warning == NULL)
917 if (ratecheck(&zone->uz_ratecheck, &warninterval))
918 printf("[zone: %s] %s\n", zone->uz_name, zone->uz_warning);
922 zone_maxaction(uma_zone_t zone)
925 if (zone->uz_maxaction.ta_func != NULL)
926 taskqueue_enqueue(taskqueue_thread, &zone->uz_maxaction);
930 * Routine called by timeout which is used to fire off some time interval
931 * based calculations. (stats, hash size, etc.)
940 uma_timeout(void *unused)
943 zone_foreach(zone_timeout, NULL);
945 /* Reschedule this event */
946 callout_reset(&uma_callout, UMA_TIMEOUT * hz, uma_timeout, NULL);
950 * Update the working set size estimate for the zone's bucket cache.
951 * The constants chosen here are somewhat arbitrary. With an update period of
952 * 20s (UMA_TIMEOUT), this estimate is dominated by zone activity over the
956 zone_domain_update_wss(uma_zone_domain_t zdom)
961 MPASS(zdom->uzd_imax >= zdom->uzd_imin);
962 wss = zdom->uzd_imax - zdom->uzd_imin;
963 zdom->uzd_imax = zdom->uzd_imin = zdom->uzd_nitems;
964 zdom->uzd_wss = (4 * wss + zdom->uzd_wss) / 5;
969 * Routine to perform timeout driven calculations. This expands the
970 * hashes and does per cpu statistics aggregation.
975 zone_timeout(uma_zone_t zone, void *unused)
980 if ((zone->uz_flags & UMA_ZFLAG_HASH) == 0)
986 * Hash zones are non-numa by definition so the first domain
987 * is the only one present.
990 pages = keg->uk_domain[0].ud_pages;
993 * Expand the keg hash table.
995 * This is done if the number of slabs is larger than the hash size.
996 * What I'm trying to do here is completely reduce collisions. This
997 * may be a little aggressive. Should I allow for two collisions max?
999 if ((slabs = pages / keg->uk_ppera) > keg->uk_hash.uh_hashsize) {
1000 struct uma_hash newhash;
1001 struct uma_hash oldhash;
1005 * This is so involved because allocating and freeing
1006 * while the keg lock is held will lead to deadlock.
1007 * I have to do everything in stages and check for
1011 ret = hash_alloc(&newhash, 1 << fls(slabs));
1014 if (hash_expand(&keg->uk_hash, &newhash)) {
1015 oldhash = keg->uk_hash;
1016 keg->uk_hash = newhash;
1021 hash_free(&oldhash);
1028 for (int i = 0; i < vm_ndomains; i++)
1029 zone_domain_update_wss(ZDOM_GET(zone, i));
1033 * Allocate and zero fill the next sized hash table from the appropriate
1037 * hash A new hash structure with the old hash size in uh_hashsize
1040 * 1 on success and 0 on failure.
1043 hash_alloc(struct uma_hash *hash, u_int size)
1047 KASSERT(powerof2(size), ("hash size must be power of 2"));
1048 if (size > UMA_HASH_SIZE_INIT) {
1049 hash->uh_hashsize = size;
1050 alloc = sizeof(hash->uh_slab_hash[0]) * hash->uh_hashsize;
1051 hash->uh_slab_hash = malloc(alloc, M_UMAHASH, M_NOWAIT);
1053 alloc = sizeof(hash->uh_slab_hash[0]) * UMA_HASH_SIZE_INIT;
1054 hash->uh_slab_hash = zone_alloc_item(hashzone, NULL,
1055 UMA_ANYDOMAIN, M_WAITOK);
1056 hash->uh_hashsize = UMA_HASH_SIZE_INIT;
1058 if (hash->uh_slab_hash) {
1059 bzero(hash->uh_slab_hash, alloc);
1060 hash->uh_hashmask = hash->uh_hashsize - 1;
1068 * Expands the hash table for HASH zones. This is done from zone_timeout
1069 * to reduce collisions. This must not be done in the regular allocation
1070 * path, otherwise, we can recurse on the vm while allocating pages.
1073 * oldhash The hash you want to expand
1074 * newhash The hash structure for the new table
1082 hash_expand(struct uma_hash *oldhash, struct uma_hash *newhash)
1084 uma_hash_slab_t slab;
1088 if (!newhash->uh_slab_hash)
1091 if (oldhash->uh_hashsize >= newhash->uh_hashsize)
1095 * I need to investigate hash algorithms for resizing without a
1099 for (idx = 0; idx < oldhash->uh_hashsize; idx++)
1100 while (!LIST_EMPTY(&oldhash->uh_slab_hash[idx])) {
1101 slab = LIST_FIRST(&oldhash->uh_slab_hash[idx]);
1102 LIST_REMOVE(slab, uhs_hlink);
1103 hval = UMA_HASH(newhash, slab->uhs_data);
1104 LIST_INSERT_HEAD(&newhash->uh_slab_hash[hval],
1112 * Free the hash bucket to the appropriate backing store.
1115 * slab_hash The hash bucket we're freeing
1116 * hashsize The number of entries in that hash bucket
1122 hash_free(struct uma_hash *hash)
1124 if (hash->uh_slab_hash == NULL)
1126 if (hash->uh_hashsize == UMA_HASH_SIZE_INIT)
1127 zone_free_item(hashzone, hash->uh_slab_hash, NULL, SKIP_NONE);
1129 free(hash->uh_slab_hash, M_UMAHASH);
1133 * Frees all outstanding items in a bucket
1136 * zone The zone to free to, must be unlocked.
1137 * bucket The free/alloc bucket with items.
1143 bucket_drain(uma_zone_t zone, uma_bucket_t bucket)
1147 if (bucket->ub_cnt == 0)
1150 if ((zone->uz_flags & UMA_ZONE_SMR) != 0 &&
1151 bucket->ub_seq != SMR_SEQ_INVALID) {
1152 smr_wait(zone->uz_smr, bucket->ub_seq);
1153 bucket->ub_seq = SMR_SEQ_INVALID;
1154 for (i = 0; i < bucket->ub_cnt; i++)
1155 item_dtor(zone, bucket->ub_bucket[i],
1156 zone->uz_size, NULL, SKIP_NONE);
1159 for (i = 0; i < bucket->ub_cnt; i++)
1160 zone->uz_fini(bucket->ub_bucket[i], zone->uz_size);
1161 zone->uz_release(zone->uz_arg, bucket->ub_bucket, bucket->ub_cnt);
1162 if (zone->uz_max_items > 0)
1163 zone_free_limit(zone, bucket->ub_cnt);
1165 bzero(bucket->ub_bucket, sizeof(void *) * bucket->ub_cnt);
1171 * Drains the per cpu caches for a zone.
1173 * NOTE: This may only be called while the zone is being torn down, and not
1174 * during normal operation. This is necessary in order that we do not have
1175 * to migrate CPUs to drain the per-CPU caches.
1178 * zone The zone to drain, must be unlocked.
1184 cache_drain(uma_zone_t zone)
1187 uma_bucket_t bucket;
1192 * XXX: It is safe to not lock the per-CPU caches, because we're
1193 * tearing down the zone anyway. I.e., there will be no further use
1194 * of the caches at this point.
1196 * XXX: It would good to be able to assert that the zone is being
1197 * torn down to prevent improper use of cache_drain().
1199 seq = SMR_SEQ_INVALID;
1200 if ((zone->uz_flags & UMA_ZONE_SMR) != 0)
1201 seq = smr_advance(zone->uz_smr);
1203 cache = &zone->uz_cpu[cpu];
1204 bucket = cache_bucket_unload_alloc(cache);
1206 bucket_free(zone, bucket, NULL);
1207 bucket = cache_bucket_unload_free(cache);
1208 if (bucket != NULL) {
1209 bucket->ub_seq = seq;
1210 bucket_free(zone, bucket, NULL);
1212 bucket = cache_bucket_unload_cross(cache);
1213 if (bucket != NULL) {
1214 bucket->ub_seq = seq;
1215 bucket_free(zone, bucket, NULL);
1218 bucket_cache_reclaim(zone, true);
1222 cache_shrink(uma_zone_t zone, void *unused)
1225 if (zone->uz_flags & UMA_ZFLAG_INTERNAL)
1228 zone->uz_bucket_size =
1229 (zone->uz_bucket_size_min + zone->uz_bucket_size) / 2;
1233 cache_drain_safe_cpu(uma_zone_t zone, void *unused)
1236 uma_bucket_t b1, b2, b3;
1239 if (zone->uz_flags & UMA_ZFLAG_INTERNAL)
1242 b1 = b2 = b3 = NULL;
1244 cache = &zone->uz_cpu[curcpu];
1245 domain = PCPU_GET(domain);
1246 b1 = cache_bucket_unload_alloc(cache);
1249 * Don't flush SMR zone buckets. This leaves the zone without a
1250 * bucket and forces every free to synchronize().
1252 if ((zone->uz_flags & UMA_ZONE_SMR) == 0) {
1253 b2 = cache_bucket_unload_free(cache);
1254 b3 = cache_bucket_unload_cross(cache);
1259 zone_free_bucket(zone, b1, NULL, domain, false);
1261 zone_free_bucket(zone, b2, NULL, domain, false);
1263 /* Adjust the domain so it goes to zone_free_cross. */
1264 domain = (domain + 1) % vm_ndomains;
1265 zone_free_bucket(zone, b3, NULL, domain, false);
1270 * Safely drain per-CPU caches of a zone(s) to alloc bucket.
1271 * This is an expensive call because it needs to bind to all CPUs
1272 * one by one and enter a critical section on each of them in order
1273 * to safely access their cache buckets.
1274 * Zone lock must not be held on call this function.
1277 pcpu_cache_drain_safe(uma_zone_t zone)
1282 * Polite bucket sizes shrinking was not enough, shrink aggressively.
1285 cache_shrink(zone, NULL);
1287 zone_foreach(cache_shrink, NULL);
1290 thread_lock(curthread);
1291 sched_bind(curthread, cpu);
1292 thread_unlock(curthread);
1295 cache_drain_safe_cpu(zone, NULL);
1297 zone_foreach(cache_drain_safe_cpu, NULL);
1299 thread_lock(curthread);
1300 sched_unbind(curthread);
1301 thread_unlock(curthread);
1305 * Reclaim cached buckets from a zone. All buckets are reclaimed if the caller
1306 * requested a drain, otherwise the per-domain caches are trimmed to either
1307 * estimated working set size.
1310 bucket_cache_reclaim(uma_zone_t zone, bool drain)
1312 uma_zone_domain_t zdom;
1313 uma_bucket_t bucket;
1318 * Shrink the zone bucket size to ensure that the per-CPU caches
1319 * don't grow too large.
1321 if (zone->uz_bucket_size > zone->uz_bucket_size_min)
1322 zone->uz_bucket_size--;
1324 for (i = 0; i < vm_ndomains; i++) {
1326 * The cross bucket is partially filled and not part of
1327 * the item count. Reclaim it individually here.
1329 zdom = ZDOM_GET(zone, i);
1330 if ((zone->uz_flags & UMA_ZONE_SMR) == 0 || drain) {
1331 ZONE_CROSS_LOCK(zone);
1332 bucket = zdom->uzd_cross;
1333 zdom->uzd_cross = NULL;
1334 ZONE_CROSS_UNLOCK(zone);
1336 bucket_free(zone, bucket, NULL);
1340 * If we were asked to drain the zone, we are done only once
1341 * this bucket cache is empty. Otherwise, we reclaim items in
1342 * excess of the zone's estimated working set size. If the
1343 * difference nitems - imin is larger than the WSS estimate,
1344 * then the estimate will grow at the end of this interval and
1345 * we ignore the historical average.
1348 target = drain ? 0 : lmax(zdom->uzd_wss, zdom->uzd_nitems -
1350 while (zdom->uzd_nitems > target) {
1351 bucket = zone_fetch_bucket(zone, zdom, true);
1354 bucket_free(zone, bucket, NULL);
1362 keg_free_slab(uma_keg_t keg, uma_slab_t slab, int start)
1368 CTR4(KTR_UMA, "keg_free_slab keg %s(%p) slab %p, returning %d bytes",
1369 keg->uk_name, keg, slab, PAGE_SIZE * keg->uk_ppera);
1371 mem = slab_data(slab, keg);
1372 flags = slab->us_flags;
1374 if (keg->uk_fini != NULL) {
1375 for (i--; i > -1; i--)
1378 * trash_fini implies that dtor was trash_dtor. trash_fini
1379 * would check that memory hasn't been modified since free,
1380 * which executed trash_dtor.
1381 * That's why we need to run uma_dbg_kskip() check here,
1382 * albeit we don't make skip check for other init/fini
1385 if (!uma_dbg_kskip(keg, slab_item(slab, keg, i)) ||
1386 keg->uk_fini != trash_fini)
1388 keg->uk_fini(slab_item(slab, keg, i), keg->uk_size);
1390 if (keg->uk_flags & UMA_ZFLAG_OFFPAGE)
1391 zone_free_item(slabzone(keg->uk_ipers), slab_tohashslab(slab),
1393 keg->uk_freef(mem, PAGE_SIZE * keg->uk_ppera, flags);
1394 uma_total_dec(PAGE_SIZE * keg->uk_ppera);
1398 keg_drain_domain(uma_keg_t keg, int domain)
1400 struct slabhead freeslabs;
1402 uma_slab_t slab, tmp;
1403 uint32_t i, stofree, stokeep, partial;
1405 dom = &keg->uk_domain[domain];
1406 LIST_INIT(&freeslabs);
1408 CTR4(KTR_UMA, "keg_drain %s(%p) domain %d free items: %u",
1409 keg->uk_name, keg, domain, dom->ud_free_items);
1411 KEG_LOCK(keg, domain);
1414 * Are the free items in partially allocated slabs sufficient to meet
1415 * the reserve? If not, compute the number of fully free slabs that must
1418 partial = dom->ud_free_items - dom->ud_free_slabs * keg->uk_ipers;
1419 if (partial < keg->uk_reserve) {
1420 stokeep = min(dom->ud_free_slabs,
1421 howmany(keg->uk_reserve - partial, keg->uk_ipers));
1425 stofree = dom->ud_free_slabs - stokeep;
1428 * Partition the free slabs into two sets: those that must be kept in
1429 * order to maintain the reserve, and those that may be released back to
1430 * the system. Since one set may be much larger than the other,
1431 * populate the smaller of the two sets and swap them if necessary.
1433 for (i = min(stofree, stokeep); i > 0; i--) {
1434 slab = LIST_FIRST(&dom->ud_free_slab);
1435 LIST_REMOVE(slab, us_link);
1436 LIST_INSERT_HEAD(&freeslabs, slab, us_link);
1438 if (stofree > stokeep)
1439 LIST_SWAP(&freeslabs, &dom->ud_free_slab, uma_slab, us_link);
1441 if ((keg->uk_flags & UMA_ZFLAG_HASH) != 0) {
1442 LIST_FOREACH(slab, &freeslabs, us_link)
1443 UMA_HASH_REMOVE(&keg->uk_hash, slab);
1445 dom->ud_free_items -= stofree * keg->uk_ipers;
1446 dom->ud_free_slabs -= stofree;
1447 dom->ud_pages -= stofree * keg->uk_ppera;
1448 KEG_UNLOCK(keg, domain);
1450 LIST_FOREACH_SAFE(slab, &freeslabs, us_link, tmp)
1451 keg_free_slab(keg, slab, keg->uk_ipers);
1455 * Frees pages from a keg back to the system. This is done on demand from
1456 * the pageout daemon.
1461 keg_drain(uma_keg_t keg)
1465 if ((keg->uk_flags & UMA_ZONE_NOFREE) != 0)
1467 for (i = 0; i < vm_ndomains; i++)
1468 keg_drain_domain(keg, i);
1472 zone_reclaim(uma_zone_t zone, int waitok, bool drain)
1476 * Set draining to interlock with zone_dtor() so we can release our
1477 * locks as we go. Only dtor() should do a WAITOK call since it
1478 * is the only call that knows the structure will still be available
1482 while (zone->uz_flags & UMA_ZFLAG_RECLAIMING) {
1483 if (waitok == M_NOWAIT)
1485 msleep(zone, &ZDOM_GET(zone, 0)->uzd_lock, PVM, "zonedrain",
1488 zone->uz_flags |= UMA_ZFLAG_RECLAIMING;
1490 bucket_cache_reclaim(zone, drain);
1493 * The DRAINING flag protects us from being freed while
1494 * we're running. Normally the uma_rwlock would protect us but we
1495 * must be able to release and acquire the right lock for each keg.
1497 if ((zone->uz_flags & UMA_ZFLAG_CACHE) == 0)
1498 keg_drain(zone->uz_keg);
1500 zone->uz_flags &= ~UMA_ZFLAG_RECLAIMING;
1507 zone_drain(uma_zone_t zone, void *unused)
1510 zone_reclaim(zone, M_NOWAIT, true);
1514 zone_trim(uma_zone_t zone, void *unused)
1517 zone_reclaim(zone, M_NOWAIT, false);
1521 * Allocate a new slab for a keg and inserts it into the partial slab list.
1522 * The keg should be unlocked on entry. If the allocation succeeds it will
1523 * be locked on return.
1526 * flags Wait flags for the item initialization routine
1527 * aflags Wait flags for the slab allocation
1530 * The slab that was allocated or NULL if there is no memory and the
1531 * caller specified M_NOWAIT.
1534 keg_alloc_slab(uma_keg_t keg, uma_zone_t zone, int domain, int flags,
1545 KASSERT(domain >= 0 && domain < vm_ndomains,
1546 ("keg_alloc_slab: domain %d out of range", domain));
1548 allocf = keg->uk_allocf;
1551 if (keg->uk_flags & UMA_ZFLAG_OFFPAGE) {
1552 uma_hash_slab_t hslab;
1553 hslab = zone_alloc_item(slabzone(keg->uk_ipers), NULL,
1557 slab = &hslab->uhs_slab;
1561 * This reproduces the old vm_zone behavior of zero filling pages the
1562 * first time they are added to a zone.
1564 * Malloced items are zeroed in uma_zalloc.
1567 if ((keg->uk_flags & UMA_ZONE_MALLOC) == 0)
1572 if (keg->uk_flags & UMA_ZONE_NODUMP)
1575 /* zone is passed for legacy reasons. */
1576 size = keg->uk_ppera * PAGE_SIZE;
1577 mem = allocf(zone, size, domain, &sflags, aflags);
1579 if (keg->uk_flags & UMA_ZFLAG_OFFPAGE)
1580 zone_free_item(slabzone(keg->uk_ipers),
1581 slab_tohashslab(slab), NULL, SKIP_NONE);
1584 uma_total_inc(size);
1586 /* For HASH zones all pages go to the same uma_domain. */
1587 if ((keg->uk_flags & UMA_ZFLAG_HASH) != 0)
1590 /* Point the slab into the allocated memory */
1591 if (!(keg->uk_flags & UMA_ZFLAG_OFFPAGE))
1592 slab = (uma_slab_t )(mem + keg->uk_pgoff);
1594 slab_tohashslab(slab)->uhs_data = mem;
1596 if (keg->uk_flags & UMA_ZFLAG_VTOSLAB)
1597 for (i = 0; i < keg->uk_ppera; i++)
1598 vsetzoneslab((vm_offset_t)mem + (i * PAGE_SIZE),
1601 slab->us_freecount = keg->uk_ipers;
1602 slab->us_flags = sflags;
1603 slab->us_domain = domain;
1605 BIT_FILL(keg->uk_ipers, &slab->us_free);
1607 BIT_ZERO(keg->uk_ipers, slab_dbg_bits(slab, keg));
1610 if (keg->uk_init != NULL) {
1611 for (i = 0; i < keg->uk_ipers; i++)
1612 if (keg->uk_init(slab_item(slab, keg, i),
1613 keg->uk_size, flags) != 0)
1615 if (i != keg->uk_ipers) {
1616 keg_free_slab(keg, slab, i);
1620 KEG_LOCK(keg, domain);
1622 CTR3(KTR_UMA, "keg_alloc_slab: allocated slab %p for %s(%p)",
1623 slab, keg->uk_name, keg);
1625 if (keg->uk_flags & UMA_ZFLAG_HASH)
1626 UMA_HASH_INSERT(&keg->uk_hash, slab, mem);
1629 * If we got a slab here it's safe to mark it partially used
1630 * and return. We assume that the caller is going to remove
1631 * at least one item.
1633 dom = &keg->uk_domain[domain];
1634 LIST_INSERT_HEAD(&dom->ud_part_slab, slab, us_link);
1635 dom->ud_pages += keg->uk_ppera;
1636 dom->ud_free_items += keg->uk_ipers;
1645 * This function is intended to be used early on in place of page_alloc() so
1646 * that we may use the boot time page cache to satisfy allocations before
1650 startup_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
1659 pages = howmany(bytes, PAGE_SIZE);
1660 KASSERT(pages > 0, ("%s can't reserve 0 pages", __func__));
1662 *pflag = UMA_SLAB_BOOT;
1663 m = vm_page_alloc_contig_domain(NULL, 0, domain,
1664 malloc2vm_flags(wait) | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED, pages,
1665 (vm_paddr_t)0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT);
1669 pa = VM_PAGE_TO_PHYS(m);
1670 for (i = 0; i < pages; i++, pa += PAGE_SIZE) {
1671 #if defined(__aarch64__) || defined(__amd64__) || defined(__mips__) || \
1672 defined(__riscv) || defined(__powerpc64__)
1673 if ((wait & M_NODUMP) == 0)
1677 /* Allocate KVA and indirectly advance bootmem. */
1678 mem = (void *)pmap_map(&bootmem, m->phys_addr,
1679 m->phys_addr + (pages * PAGE_SIZE), VM_PROT_READ | VM_PROT_WRITE);
1680 if ((wait & M_ZERO) != 0)
1681 bzero(mem, pages * PAGE_SIZE);
1687 startup_free(void *mem, vm_size_t bytes)
1692 va = (vm_offset_t)mem;
1693 m = PHYS_TO_VM_PAGE(pmap_kextract(va));
1694 pmap_remove(kernel_pmap, va, va + bytes);
1695 for (; bytes != 0; bytes -= PAGE_SIZE, m++) {
1696 #if defined(__aarch64__) || defined(__amd64__) || defined(__mips__) || \
1697 defined(__riscv) || defined(__powerpc64__)
1698 dump_drop_page(VM_PAGE_TO_PHYS(m));
1700 vm_page_unwire_noq(m);
1706 * Allocates a number of pages from the system
1709 * bytes The number of bytes requested
1710 * wait Shall we wait?
1713 * A pointer to the alloced memory or possibly
1714 * NULL if M_NOWAIT is set.
1717 page_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
1720 void *p; /* Returned page */
1722 *pflag = UMA_SLAB_KERNEL;
1723 p = (void *)kmem_malloc_domainset(DOMAINSET_FIXED(domain), bytes, wait);
1729 pcpu_page_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
1732 struct pglist alloctail;
1733 vm_offset_t addr, zkva;
1735 vm_page_t p, p_next;
1740 MPASS(bytes == (mp_maxid + 1) * PAGE_SIZE);
1742 TAILQ_INIT(&alloctail);
1743 flags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED | VM_ALLOC_NOOBJ |
1744 malloc2vm_flags(wait);
1745 *pflag = UMA_SLAB_KERNEL;
1746 for (cpu = 0; cpu <= mp_maxid; cpu++) {
1747 if (CPU_ABSENT(cpu)) {
1748 p = vm_page_alloc(NULL, 0, flags);
1751 p = vm_page_alloc(NULL, 0, flags);
1753 pc = pcpu_find(cpu);
1754 if (__predict_false(VM_DOMAIN_EMPTY(pc->pc_domain)))
1757 p = vm_page_alloc_domain(NULL, 0,
1758 pc->pc_domain, flags);
1759 if (__predict_false(p == NULL))
1760 p = vm_page_alloc(NULL, 0, flags);
1763 if (__predict_false(p == NULL))
1765 TAILQ_INSERT_TAIL(&alloctail, p, listq);
1767 if ((addr = kva_alloc(bytes)) == 0)
1770 TAILQ_FOREACH(p, &alloctail, listq) {
1771 pmap_qenter(zkva, &p, 1);
1774 return ((void*)addr);
1776 TAILQ_FOREACH_SAFE(p, &alloctail, listq, p_next) {
1777 vm_page_unwire_noq(p);
1784 * Allocates a number of pages from within an object
1787 * bytes The number of bytes requested
1788 * wait Shall we wait?
1791 * A pointer to the alloced memory or possibly
1792 * NULL if M_NOWAIT is set.
1795 noobj_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *flags,
1798 TAILQ_HEAD(, vm_page) alloctail;
1800 vm_offset_t retkva, zkva;
1801 vm_page_t p, p_next;
1804 TAILQ_INIT(&alloctail);
1807 npages = howmany(bytes, PAGE_SIZE);
1808 while (npages > 0) {
1809 p = vm_page_alloc_domain(NULL, 0, domain, VM_ALLOC_INTERRUPT |
1810 VM_ALLOC_WIRED | VM_ALLOC_NOOBJ |
1811 ((wait & M_WAITOK) != 0 ? VM_ALLOC_WAITOK :
1815 * Since the page does not belong to an object, its
1818 TAILQ_INSERT_TAIL(&alloctail, p, listq);
1823 * Page allocation failed, free intermediate pages and
1826 TAILQ_FOREACH_SAFE(p, &alloctail, listq, p_next) {
1827 vm_page_unwire_noq(p);
1832 *flags = UMA_SLAB_PRIV;
1833 zkva = keg->uk_kva +
1834 atomic_fetchadd_long(&keg->uk_offset, round_page(bytes));
1836 TAILQ_FOREACH(p, &alloctail, listq) {
1837 pmap_qenter(zkva, &p, 1);
1841 return ((void *)retkva);
1845 * Allocate physically contiguous pages.
1848 contig_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
1852 *pflag = UMA_SLAB_KERNEL;
1853 return ((void *)kmem_alloc_contig_domainset(DOMAINSET_FIXED(domain),
1854 bytes, wait, 0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT));
1858 * Frees a number of pages to the system
1861 * mem A pointer to the memory to be freed
1862 * size The size of the memory being freed
1863 * flags The original p->us_flags field
1869 page_free(void *mem, vm_size_t size, uint8_t flags)
1872 if ((flags & UMA_SLAB_BOOT) != 0) {
1873 startup_free(mem, size);
1877 KASSERT((flags & UMA_SLAB_KERNEL) != 0,
1878 ("UMA: page_free used with invalid flags %x", flags));
1880 kmem_free((vm_offset_t)mem, size);
1884 * Frees pcpu zone allocations
1887 * mem A pointer to the memory to be freed
1888 * size The size of the memory being freed
1889 * flags The original p->us_flags field
1895 pcpu_page_free(void *mem, vm_size_t size, uint8_t flags)
1897 vm_offset_t sva, curva;
1901 MPASS(size == (mp_maxid+1)*PAGE_SIZE);
1903 if ((flags & UMA_SLAB_BOOT) != 0) {
1904 startup_free(mem, size);
1908 sva = (vm_offset_t)mem;
1909 for (curva = sva; curva < sva + size; curva += PAGE_SIZE) {
1910 paddr = pmap_kextract(curva);
1911 m = PHYS_TO_VM_PAGE(paddr);
1912 vm_page_unwire_noq(m);
1915 pmap_qremove(sva, size >> PAGE_SHIFT);
1916 kva_free(sva, size);
1920 * Zero fill initializer
1922 * Arguments/Returns follow uma_init specifications
1925 zero_init(void *mem, int size, int flags)
1932 static struct noslabbits *
1933 slab_dbg_bits(uma_slab_t slab, uma_keg_t keg)
1936 return ((void *)((char *)&slab->us_free + BITSET_SIZE(keg->uk_ipers)));
1941 * Actual size of embedded struct slab (!OFFPAGE).
1944 slab_sizeof(int nitems)
1948 s = sizeof(struct uma_slab) + BITSET_SIZE(nitems) * SLAB_BITSETS;
1949 return (roundup(s, UMA_ALIGN_PTR + 1));
1952 #define UMA_FIXPT_SHIFT 31
1953 #define UMA_FRAC_FIXPT(n, d) \
1954 ((uint32_t)(((uint64_t)(n) << UMA_FIXPT_SHIFT) / (d)))
1955 #define UMA_FIXPT_PCT(f) \
1956 ((u_int)(((uint64_t)100 * (f)) >> UMA_FIXPT_SHIFT))
1957 #define UMA_PCT_FIXPT(pct) UMA_FRAC_FIXPT((pct), 100)
1958 #define UMA_MIN_EFF UMA_PCT_FIXPT(100 - UMA_MAX_WASTE)
1961 * Compute the number of items that will fit in a slab. If hdr is true, the
1962 * item count may be limited to provide space in the slab for an inline slab
1963 * header. Otherwise, all slab space will be provided for item storage.
1966 slab_ipers_hdr(u_int size, u_int rsize, u_int slabsize, bool hdr)
1971 /* The padding between items is not needed after the last item. */
1972 padpi = rsize - size;
1976 * Start with the maximum item count and remove items until
1977 * the slab header first alongside the allocatable memory.
1979 for (ipers = MIN(SLAB_MAX_SETSIZE,
1980 (slabsize + padpi - slab_sizeof(1)) / rsize);
1982 ipers * rsize - padpi + slab_sizeof(ipers) > slabsize;
1986 ipers = MIN((slabsize + padpi) / rsize, SLAB_MAX_SETSIZE);
1992 struct keg_layout_result {
2000 keg_layout_one(uma_keg_t keg, u_int rsize, u_int slabsize, u_int fmt,
2001 struct keg_layout_result *kl)
2006 kl->slabsize = slabsize;
2008 /* Handle INTERNAL as inline with an extra page. */
2009 if ((fmt & UMA_ZFLAG_INTERNAL) != 0) {
2010 kl->format &= ~UMA_ZFLAG_INTERNAL;
2011 kl->slabsize += PAGE_SIZE;
2014 kl->ipers = slab_ipers_hdr(keg->uk_size, rsize, kl->slabsize,
2015 (fmt & UMA_ZFLAG_OFFPAGE) == 0);
2017 /* Account for memory used by an offpage slab header. */
2018 total = kl->slabsize;
2019 if ((fmt & UMA_ZFLAG_OFFPAGE) != 0)
2020 total += slabzone(kl->ipers)->uz_keg->uk_rsize;
2022 kl->eff = UMA_FRAC_FIXPT(kl->ipers * rsize, total);
2026 * Determine the format of a uma keg. This determines where the slab header
2027 * will be placed (inline or offpage) and calculates ipers, rsize, and ppera.
2030 * keg The zone we should initialize
2036 keg_layout(uma_keg_t keg)
2038 struct keg_layout_result kl = {}, kl_tmp;
2047 KASSERT((keg->uk_flags & UMA_ZONE_PCPU) == 0 ||
2048 (keg->uk_size <= UMA_PCPU_ALLOC_SIZE &&
2049 (keg->uk_flags & UMA_ZONE_CACHESPREAD) == 0),
2050 ("%s: cannot configure for PCPU: keg=%s, size=%u, flags=0x%b",
2051 __func__, keg->uk_name, keg->uk_size, keg->uk_flags,
2053 KASSERT((keg->uk_flags & (UMA_ZFLAG_INTERNAL | UMA_ZONE_VM)) == 0 ||
2054 (keg->uk_flags & (UMA_ZONE_NOTOUCH | UMA_ZONE_PCPU)) == 0,
2055 ("%s: incompatible flags 0x%b", __func__, keg->uk_flags,
2058 alignsize = keg->uk_align + 1;
2061 * Calculate the size of each allocation (rsize) according to
2062 * alignment. If the requested size is smaller than we have
2063 * allocation bits for we round it up.
2065 rsize = MAX(keg->uk_size, UMA_SMALLEST_UNIT);
2066 rsize = roundup2(rsize, alignsize);
2068 if ((keg->uk_flags & UMA_ZONE_CACHESPREAD) != 0) {
2070 * We want one item to start on every align boundary in a page.
2071 * To do this we will span pages. We will also extend the item
2072 * by the size of align if it is an even multiple of align.
2073 * Otherwise, it would fall on the same boundary every time.
2075 if ((rsize & alignsize) == 0)
2077 slabsize = rsize * (PAGE_SIZE / alignsize);
2078 slabsize = MIN(slabsize, rsize * SLAB_MAX_SETSIZE);
2079 slabsize = MIN(slabsize, UMA_CACHESPREAD_MAX_SIZE);
2080 slabsize = round_page(slabsize);
2083 * Start with a slab size of as many pages as it takes to
2084 * represent a single item. We will try to fit as many
2085 * additional items into the slab as possible.
2087 slabsize = round_page(keg->uk_size);
2090 /* Build a list of all of the available formats for this keg. */
2093 /* Evaluate an inline slab layout. */
2094 if ((keg->uk_flags & (UMA_ZONE_NOTOUCH | UMA_ZONE_PCPU)) == 0)
2097 /* TODO: vm_page-embedded slab. */
2100 * We can't do OFFPAGE if we're internal or if we've been
2101 * asked to not go to the VM for buckets. If we do this we
2102 * may end up going to the VM for slabs which we do not want
2103 * to do if we're UMA_ZONE_VM, which clearly forbids it.
2104 * In those cases, evaluate a pseudo-format called INTERNAL
2105 * which has an inline slab header and one extra page to
2106 * guarantee that it fits.
2108 * Otherwise, see if using an OFFPAGE slab will improve our
2111 if ((keg->uk_flags & (UMA_ZFLAG_INTERNAL | UMA_ZONE_VM)) != 0)
2112 fmts[nfmt++] = UMA_ZFLAG_INTERNAL;
2114 fmts[nfmt++] = UMA_ZFLAG_OFFPAGE;
2117 * Choose a slab size and format which satisfy the minimum efficiency.
2118 * Prefer the smallest slab size that meets the constraints.
2120 * Start with a minimum slab size, to accommodate CACHESPREAD. Then,
2121 * for small items (up to PAGE_SIZE), the iteration increment is one
2122 * page; and for large items, the increment is one item.
2124 i = (slabsize + rsize - keg->uk_size) / MAX(PAGE_SIZE, rsize);
2125 KASSERT(i >= 1, ("keg %s(%p) flags=0x%b slabsize=%u, rsize=%u, i=%u",
2126 keg->uk_name, keg, keg->uk_flags, PRINT_UMA_ZFLAGS, slabsize,
2129 slabsize = (rsize <= PAGE_SIZE) ? ptoa(i) :
2130 round_page(rsize * (i - 1) + keg->uk_size);
2132 for (j = 0; j < nfmt; j++) {
2133 /* Only if we have no viable format yet. */
2134 if ((fmts[j] & UMA_ZFLAG_INTERNAL) != 0 &&
2138 keg_layout_one(keg, rsize, slabsize, fmts[j], &kl_tmp);
2139 if (kl_tmp.eff <= kl.eff)
2144 CTR6(KTR_UMA, "keg %s layout: format %#x "
2145 "(ipers %u * rsize %u) / slabsize %#x = %u%% eff",
2146 keg->uk_name, kl.format, kl.ipers, rsize,
2147 kl.slabsize, UMA_FIXPT_PCT(kl.eff));
2149 /* Stop when we reach the minimum efficiency. */
2150 if (kl.eff >= UMA_MIN_EFF)
2154 if (kl.eff >= UMA_MIN_EFF || !multipage_slabs ||
2155 slabsize >= SLAB_MAX_SETSIZE * rsize ||
2156 (keg->uk_flags & (UMA_ZONE_PCPU | UMA_ZONE_CONTIG)) != 0)
2160 pages = atop(kl.slabsize);
2161 if ((keg->uk_flags & UMA_ZONE_PCPU) != 0)
2162 pages *= mp_maxid + 1;
2164 keg->uk_rsize = rsize;
2165 keg->uk_ipers = kl.ipers;
2166 keg->uk_ppera = pages;
2167 keg->uk_flags |= kl.format;
2170 * How do we find the slab header if it is offpage or if not all item
2171 * start addresses are in the same page? We could solve the latter
2172 * case with vaddr alignment, but we don't.
2174 if ((keg->uk_flags & UMA_ZFLAG_OFFPAGE) != 0 ||
2175 (keg->uk_ipers - 1) * rsize >= PAGE_SIZE) {
2176 if ((keg->uk_flags & UMA_ZONE_NOTPAGE) != 0)
2177 keg->uk_flags |= UMA_ZFLAG_HASH;
2179 keg->uk_flags |= UMA_ZFLAG_VTOSLAB;
2182 CTR6(KTR_UMA, "%s: keg=%s, flags=%#x, rsize=%u, ipers=%u, ppera=%u",
2183 __func__, keg->uk_name, keg->uk_flags, rsize, keg->uk_ipers,
2185 KASSERT(keg->uk_ipers > 0 && keg->uk_ipers <= SLAB_MAX_SETSIZE,
2186 ("%s: keg=%s, flags=0x%b, rsize=%u, ipers=%u, ppera=%u", __func__,
2187 keg->uk_name, keg->uk_flags, PRINT_UMA_ZFLAGS, rsize,
2188 keg->uk_ipers, pages));
2192 * Keg header ctor. This initializes all fields, locks, etc. And inserts
2193 * the keg onto the global keg list.
2195 * Arguments/Returns follow uma_ctor specifications
2196 * udata Actually uma_kctor_args
2199 keg_ctor(void *mem, int size, void *udata, int flags)
2201 struct uma_kctor_args *arg = udata;
2202 uma_keg_t keg = mem;
2207 keg->uk_size = arg->size;
2208 keg->uk_init = arg->uminit;
2209 keg->uk_fini = arg->fini;
2210 keg->uk_align = arg->align;
2211 keg->uk_reserve = 0;
2212 keg->uk_flags = arg->flags;
2215 * We use a global round-robin policy by default. Zones with
2216 * UMA_ZONE_FIRSTTOUCH set will use first-touch instead, in which
2217 * case the iterator is never run.
2219 keg->uk_dr.dr_policy = DOMAINSET_RR();
2220 keg->uk_dr.dr_iter = 0;
2223 * The primary zone is passed to us at keg-creation time.
2226 keg->uk_name = zone->uz_name;
2228 if (arg->flags & UMA_ZONE_ZINIT)
2229 keg->uk_init = zero_init;
2231 if (arg->flags & UMA_ZONE_MALLOC)
2232 keg->uk_flags |= UMA_ZFLAG_VTOSLAB;
2235 keg->uk_flags &= ~UMA_ZONE_PCPU;
2241 * Use a first-touch NUMA policy for kegs that pmap_extract() will
2242 * work on. Use round-robin for everything else.
2244 * Zones may override the default by specifying either.
2247 if ((keg->uk_flags &
2248 (UMA_ZONE_ROUNDROBIN | UMA_ZFLAG_CACHE | UMA_ZONE_NOTPAGE)) == 0)
2249 keg->uk_flags |= UMA_ZONE_FIRSTTOUCH;
2250 else if ((keg->uk_flags & UMA_ZONE_FIRSTTOUCH) == 0)
2251 keg->uk_flags |= UMA_ZONE_ROUNDROBIN;
2255 * If we haven't booted yet we need allocations to go through the
2256 * startup cache until the vm is ready.
2258 #ifdef UMA_MD_SMALL_ALLOC
2259 if (keg->uk_ppera == 1)
2260 keg->uk_allocf = uma_small_alloc;
2263 if (booted < BOOT_KVA)
2264 keg->uk_allocf = startup_alloc;
2265 else if (keg->uk_flags & UMA_ZONE_PCPU)
2266 keg->uk_allocf = pcpu_page_alloc;
2267 else if ((keg->uk_flags & UMA_ZONE_CONTIG) != 0 && keg->uk_ppera > 1)
2268 keg->uk_allocf = contig_alloc;
2270 keg->uk_allocf = page_alloc;
2271 #ifdef UMA_MD_SMALL_ALLOC
2272 if (keg->uk_ppera == 1)
2273 keg->uk_freef = uma_small_free;
2276 if (keg->uk_flags & UMA_ZONE_PCPU)
2277 keg->uk_freef = pcpu_page_free;
2279 keg->uk_freef = page_free;
2282 * Initialize keg's locks.
2284 for (i = 0; i < vm_ndomains; i++)
2285 KEG_LOCK_INIT(keg, i, (arg->flags & UMA_ZONE_MTXCLASS));
2288 * If we're putting the slab header in the actual page we need to
2289 * figure out where in each page it goes. See slab_sizeof
2292 if (!(keg->uk_flags & UMA_ZFLAG_OFFPAGE)) {
2295 shsize = slab_sizeof(keg->uk_ipers);
2296 keg->uk_pgoff = (PAGE_SIZE * keg->uk_ppera) - shsize;
2298 * The only way the following is possible is if with our
2299 * UMA_ALIGN_PTR adjustments we are now bigger than
2300 * UMA_SLAB_SIZE. I haven't checked whether this is
2301 * mathematically possible for all cases, so we make
2304 KASSERT(keg->uk_pgoff + shsize <= PAGE_SIZE * keg->uk_ppera,
2305 ("zone %s ipers %d rsize %d size %d slab won't fit",
2306 zone->uz_name, keg->uk_ipers, keg->uk_rsize, keg->uk_size));
2309 if (keg->uk_flags & UMA_ZFLAG_HASH)
2310 hash_alloc(&keg->uk_hash, 0);
2312 CTR3(KTR_UMA, "keg_ctor %p zone %s(%p)", keg, zone->uz_name, zone);
2314 LIST_INSERT_HEAD(&keg->uk_zones, zone, uz_link);
2316 rw_wlock(&uma_rwlock);
2317 LIST_INSERT_HEAD(&uma_kegs, keg, uk_link);
2318 rw_wunlock(&uma_rwlock);
2323 zone_kva_available(uma_zone_t zone, void *unused)
2327 if ((zone->uz_flags & UMA_ZFLAG_CACHE) != 0)
2331 if (keg->uk_allocf == startup_alloc) {
2332 /* Switch to the real allocator. */
2333 if (keg->uk_flags & UMA_ZONE_PCPU)
2334 keg->uk_allocf = pcpu_page_alloc;
2335 else if ((keg->uk_flags & UMA_ZONE_CONTIG) != 0 &&
2337 keg->uk_allocf = contig_alloc;
2339 keg->uk_allocf = page_alloc;
2344 zone_alloc_counters(uma_zone_t zone, void *unused)
2347 zone->uz_allocs = counter_u64_alloc(M_WAITOK);
2348 zone->uz_frees = counter_u64_alloc(M_WAITOK);
2349 zone->uz_fails = counter_u64_alloc(M_WAITOK);
2350 zone->uz_xdomain = counter_u64_alloc(M_WAITOK);
2354 zone_alloc_sysctl(uma_zone_t zone, void *unused)
2356 uma_zone_domain_t zdom;
2359 struct sysctl_oid *oid, *domainoid;
2360 int domains, i, cnt;
2361 static const char *nokeg = "cache zone";
2365 * Make a sysctl safe copy of the zone name by removing
2366 * any special characters and handling dups by appending
2369 if (zone->uz_namecnt != 0) {
2370 /* Count the number of decimal digits and '_' separator. */
2371 for (i = 1, cnt = zone->uz_namecnt; cnt != 0; i++)
2373 zone->uz_ctlname = malloc(strlen(zone->uz_name) + i + 1,
2375 sprintf(zone->uz_ctlname, "%s_%d", zone->uz_name,
2378 zone->uz_ctlname = strdup(zone->uz_name, M_UMA);
2379 for (c = zone->uz_ctlname; *c != '\0'; c++)
2380 if (strchr("./\\ -", *c) != NULL)
2384 * Basic parameters at the root.
2386 zone->uz_oid = SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_vm_uma),
2387 OID_AUTO, zone->uz_ctlname, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2389 SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2390 "size", CTLFLAG_RD, &zone->uz_size, 0, "Allocation size");
2391 SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2392 "flags", CTLFLAG_RD | CTLTYPE_STRING | CTLFLAG_MPSAFE,
2393 zone, 0, sysctl_handle_uma_zone_flags, "A",
2394 "Allocator configuration flags");
2395 SYSCTL_ADD_U16(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2396 "bucket_size", CTLFLAG_RD, &zone->uz_bucket_size, 0,
2397 "Desired per-cpu cache size");
2398 SYSCTL_ADD_U16(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2399 "bucket_size_max", CTLFLAG_RD, &zone->uz_bucket_size_max, 0,
2400 "Maximum allowed per-cpu cache size");
2405 if ((zone->uz_flags & UMA_ZFLAG_HASH) == 0)
2406 domains = vm_ndomains;
2409 oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(zone->uz_oid), OID_AUTO,
2410 "keg", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2412 if ((zone->uz_flags & UMA_ZFLAG_CACHE) == 0) {
2413 SYSCTL_ADD_CONST_STRING(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2414 "name", CTLFLAG_RD, keg->uk_name, "Keg name");
2415 SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2416 "rsize", CTLFLAG_RD, &keg->uk_rsize, 0,
2417 "Real object size with alignment");
2418 SYSCTL_ADD_U16(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2419 "ppera", CTLFLAG_RD, &keg->uk_ppera, 0,
2420 "pages per-slab allocation");
2421 SYSCTL_ADD_U16(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2422 "ipers", CTLFLAG_RD, &keg->uk_ipers, 0,
2423 "items available per-slab");
2424 SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2425 "align", CTLFLAG_RD, &keg->uk_align, 0,
2426 "item alignment mask");
2427 SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2428 "reserve", CTLFLAG_RD, &keg->uk_reserve, 0,
2429 "number of reserved items");
2430 SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2431 "efficiency", CTLFLAG_RD | CTLTYPE_INT | CTLFLAG_MPSAFE,
2432 keg, 0, sysctl_handle_uma_slab_efficiency, "I",
2433 "Slab utilization (100 - internal fragmentation %)");
2434 domainoid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(oid),
2435 OID_AUTO, "domain", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2436 for (i = 0; i < domains; i++) {
2437 dom = &keg->uk_domain[i];
2438 oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(domainoid),
2439 OID_AUTO, VM_DOMAIN(i)->vmd_name,
2440 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2441 SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2442 "pages", CTLFLAG_RD, &dom->ud_pages, 0,
2443 "Total pages currently allocated from VM");
2444 SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2445 "free_items", CTLFLAG_RD, &dom->ud_free_items, 0,
2446 "items free in the slab layer");
2449 SYSCTL_ADD_CONST_STRING(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2450 "name", CTLFLAG_RD, nokeg, "Keg name");
2453 * Information about zone limits.
2455 oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(zone->uz_oid), OID_AUTO,
2456 "limit", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2457 SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2458 "items", CTLFLAG_RD | CTLTYPE_U64 | CTLFLAG_MPSAFE,
2459 zone, 0, sysctl_handle_uma_zone_items, "QU",
2460 "Current number of allocated items if limit is set");
2461 SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2462 "max_items", CTLFLAG_RD, &zone->uz_max_items, 0,
2463 "Maximum number of allocated and cached items");
2464 SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2465 "sleepers", CTLFLAG_RD, &zone->uz_sleepers, 0,
2466 "Number of threads sleeping at limit");
2467 SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2468 "sleeps", CTLFLAG_RD, &zone->uz_sleeps, 0,
2469 "Total zone limit sleeps");
2470 SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2471 "bucket_max", CTLFLAG_RD, &zone->uz_bucket_max, 0,
2472 "Maximum number of items in each domain's bucket cache");
2475 * Per-domain zone information.
2477 domainoid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(zone->uz_oid),
2478 OID_AUTO, "domain", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2479 for (i = 0; i < domains; i++) {
2480 zdom = ZDOM_GET(zone, i);
2481 oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(domainoid),
2482 OID_AUTO, VM_DOMAIN(i)->vmd_name,
2483 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2484 SYSCTL_ADD_LONG(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2485 "nitems", CTLFLAG_RD, &zdom->uzd_nitems,
2486 "number of items in this domain");
2487 SYSCTL_ADD_LONG(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2488 "imax", CTLFLAG_RD, &zdom->uzd_imax,
2489 "maximum item count in this period");
2490 SYSCTL_ADD_LONG(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2491 "imin", CTLFLAG_RD, &zdom->uzd_imin,
2492 "minimum item count in this period");
2493 SYSCTL_ADD_LONG(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2494 "wss", CTLFLAG_RD, &zdom->uzd_wss,
2495 "Working set size");
2499 * General statistics.
2501 oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(zone->uz_oid), OID_AUTO,
2502 "stats", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
2503 SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2504 "current", CTLFLAG_RD | CTLTYPE_INT | CTLFLAG_MPSAFE,
2505 zone, 1, sysctl_handle_uma_zone_cur, "I",
2506 "Current number of allocated items");
2507 SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2508 "allocs", CTLFLAG_RD | CTLTYPE_U64 | CTLFLAG_MPSAFE,
2509 zone, 0, sysctl_handle_uma_zone_allocs, "QU",
2510 "Total allocation calls");
2511 SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2512 "frees", CTLFLAG_RD | CTLTYPE_U64 | CTLFLAG_MPSAFE,
2513 zone, 0, sysctl_handle_uma_zone_frees, "QU",
2514 "Total free calls");
2515 SYSCTL_ADD_COUNTER_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2516 "fails", CTLFLAG_RD, &zone->uz_fails,
2517 "Number of allocation failures");
2518 SYSCTL_ADD_COUNTER_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
2519 "xdomain", CTLFLAG_RD, &zone->uz_xdomain,
2520 "Free calls from the wrong domain");
2523 struct uma_zone_count {
2529 zone_count(uma_zone_t zone, void *arg)
2531 struct uma_zone_count *cnt;
2535 * Some zones are rapidly created with identical names and
2536 * destroyed out of order. This can lead to gaps in the count.
2537 * Use one greater than the maximum observed for this name.
2539 if (strcmp(zone->uz_name, cnt->name) == 0)
2540 cnt->count = MAX(cnt->count,
2541 zone->uz_namecnt + 1);
2545 zone_update_caches(uma_zone_t zone)
2549 for (i = 0; i <= mp_maxid; i++) {
2550 cache_set_uz_size(&zone->uz_cpu[i], zone->uz_size);
2551 cache_set_uz_flags(&zone->uz_cpu[i], zone->uz_flags);
2556 * Zone header ctor. This initializes all fields, locks, etc.
2558 * Arguments/Returns follow uma_ctor specifications
2559 * udata Actually uma_zctor_args
2562 zone_ctor(void *mem, int size, void *udata, int flags)
2564 struct uma_zone_count cnt;
2565 struct uma_zctor_args *arg = udata;
2566 uma_zone_domain_t zdom;
2567 uma_zone_t zone = mem;
2573 zone->uz_name = arg->name;
2574 zone->uz_ctor = arg->ctor;
2575 zone->uz_dtor = arg->dtor;
2576 zone->uz_init = NULL;
2577 zone->uz_fini = NULL;
2578 zone->uz_sleeps = 0;
2579 zone->uz_bucket_size = 0;
2580 zone->uz_bucket_size_min = 0;
2581 zone->uz_bucket_size_max = BUCKET_MAX;
2582 zone->uz_flags = (arg->flags & UMA_ZONE_SMR);
2583 zone->uz_warning = NULL;
2584 /* The domain structures follow the cpu structures. */
2585 zone->uz_bucket_max = ULONG_MAX;
2586 timevalclear(&zone->uz_ratecheck);
2588 /* Count the number of duplicate names. */
2589 cnt.name = arg->name;
2591 zone_foreach(zone_count, &cnt);
2592 zone->uz_namecnt = cnt.count;
2593 ZONE_CROSS_LOCK_INIT(zone);
2595 for (i = 0; i < vm_ndomains; i++) {
2596 zdom = ZDOM_GET(zone, i);
2597 ZDOM_LOCK_INIT(zone, zdom, (arg->flags & UMA_ZONE_MTXCLASS));
2598 STAILQ_INIT(&zdom->uzd_buckets);
2602 if (arg->uminit == trash_init && arg->fini == trash_fini)
2603 zone->uz_flags |= UMA_ZFLAG_TRASH | UMA_ZFLAG_CTORDTOR;
2607 * This is a pure cache zone, no kegs.
2610 KASSERT((arg->flags & UMA_ZFLAG_CACHE) != 0,
2611 ("zone_ctor: Import specified for non-cache zone."));
2612 zone->uz_flags = arg->flags;
2613 zone->uz_size = arg->size;
2614 zone->uz_import = arg->import;
2615 zone->uz_release = arg->release;
2616 zone->uz_arg = arg->arg;
2619 * Cache zones are round-robin unless a policy is
2620 * specified because they may have incompatible
2623 if ((zone->uz_flags & UMA_ZONE_FIRSTTOUCH) == 0)
2624 zone->uz_flags |= UMA_ZONE_ROUNDROBIN;
2626 rw_wlock(&uma_rwlock);
2627 LIST_INSERT_HEAD(&uma_cachezones, zone, uz_link);
2628 rw_wunlock(&uma_rwlock);
2633 * Use the regular zone/keg/slab allocator.
2635 zone->uz_import = zone_import;
2636 zone->uz_release = zone_release;
2637 zone->uz_arg = zone;
2640 if (arg->flags & UMA_ZONE_SECONDARY) {
2641 KASSERT((zone->uz_flags & UMA_ZONE_SECONDARY) == 0,
2642 ("Secondary zone requested UMA_ZFLAG_INTERNAL"));
2643 KASSERT(arg->keg != NULL, ("Secondary zone on zero'd keg"));
2644 zone->uz_init = arg->uminit;
2645 zone->uz_fini = arg->fini;
2646 zone->uz_flags |= UMA_ZONE_SECONDARY;
2647 rw_wlock(&uma_rwlock);
2649 LIST_FOREACH(z, &keg->uk_zones, uz_link) {
2650 if (LIST_NEXT(z, uz_link) == NULL) {
2651 LIST_INSERT_AFTER(z, zone, uz_link);
2656 rw_wunlock(&uma_rwlock);
2657 } else if (keg == NULL) {
2658 if ((keg = uma_kcreate(zone, arg->size, arg->uminit, arg->fini,
2659 arg->align, arg->flags)) == NULL)
2662 struct uma_kctor_args karg;
2665 /* We should only be here from uma_startup() */
2666 karg.size = arg->size;
2667 karg.uminit = arg->uminit;
2668 karg.fini = arg->fini;
2669 karg.align = arg->align;
2670 karg.flags = (arg->flags & ~UMA_ZONE_SMR);
2672 error = keg_ctor(arg->keg, sizeof(struct uma_keg), &karg,
2678 /* Inherit properties from the keg. */
2680 zone->uz_size = keg->uk_size;
2681 zone->uz_flags |= (keg->uk_flags &
2682 (UMA_ZONE_INHERIT | UMA_ZFLAG_INHERIT));
2685 if (booted >= BOOT_PCPU) {
2686 zone_alloc_counters(zone, NULL);
2687 if (booted >= BOOT_RUNNING)
2688 zone_alloc_sysctl(zone, NULL);
2690 zone->uz_allocs = EARLY_COUNTER;
2691 zone->uz_frees = EARLY_COUNTER;
2692 zone->uz_fails = EARLY_COUNTER;
2695 /* Caller requests a private SMR context. */
2696 if ((zone->uz_flags & UMA_ZONE_SMR) != 0)
2697 zone->uz_smr = smr_create(zone->uz_name, 0, 0);
2699 KASSERT((arg->flags & (UMA_ZONE_MAXBUCKET | UMA_ZONE_NOBUCKET)) !=
2700 (UMA_ZONE_MAXBUCKET | UMA_ZONE_NOBUCKET),
2701 ("Invalid zone flag combination"));
2702 if (arg->flags & UMA_ZFLAG_INTERNAL)
2703 zone->uz_bucket_size_max = zone->uz_bucket_size = 0;
2704 if ((arg->flags & UMA_ZONE_MAXBUCKET) != 0)
2705 zone->uz_bucket_size = BUCKET_MAX;
2706 else if ((arg->flags & UMA_ZONE_NOBUCKET) != 0)
2707 zone->uz_bucket_size = 0;
2709 zone->uz_bucket_size = bucket_select(zone->uz_size);
2710 zone->uz_bucket_size_min = zone->uz_bucket_size;
2711 if (zone->uz_dtor != NULL || zone->uz_ctor != NULL)
2712 zone->uz_flags |= UMA_ZFLAG_CTORDTOR;
2713 zone_update_caches(zone);
2719 * Keg header dtor. This frees all data, destroys locks, frees the hash
2720 * table and removes the keg from the global list.
2722 * Arguments/Returns follow uma_dtor specifications
2726 keg_dtor(void *arg, int size, void *udata)
2729 uint32_t free, pages;
2732 keg = (uma_keg_t)arg;
2734 for (i = 0; i < vm_ndomains; i++) {
2735 free += keg->uk_domain[i].ud_free_items;
2736 pages += keg->uk_domain[i].ud_pages;
2737 KEG_LOCK_FINI(keg, i);
2740 printf("Freed UMA keg (%s) was not empty (%u items). "
2741 " Lost %u pages of memory.\n",
2742 keg->uk_name ? keg->uk_name : "",
2743 pages / keg->uk_ppera * keg->uk_ipers - free, pages);
2745 hash_free(&keg->uk_hash);
2751 * Arguments/Returns follow uma_dtor specifications
2755 zone_dtor(void *arg, int size, void *udata)
2761 zone = (uma_zone_t)arg;
2763 sysctl_remove_oid(zone->uz_oid, 1, 1);
2765 if (!(zone->uz_flags & UMA_ZFLAG_INTERNAL))
2768 rw_wlock(&uma_rwlock);
2769 LIST_REMOVE(zone, uz_link);
2770 rw_wunlock(&uma_rwlock);
2771 if ((zone->uz_flags & (UMA_ZONE_SECONDARY | UMA_ZFLAG_CACHE)) == 0) {
2773 keg->uk_reserve = 0;
2775 zone_reclaim(zone, M_WAITOK, true);
2778 * We only destroy kegs from non secondary/non cache zones.
2780 if ((zone->uz_flags & (UMA_ZONE_SECONDARY | UMA_ZFLAG_CACHE)) == 0) {
2782 rw_wlock(&uma_rwlock);
2783 LIST_REMOVE(keg, uk_link);
2784 rw_wunlock(&uma_rwlock);
2785 zone_free_item(kegs, keg, NULL, SKIP_NONE);
2787 counter_u64_free(zone->uz_allocs);
2788 counter_u64_free(zone->uz_frees);
2789 counter_u64_free(zone->uz_fails);
2790 counter_u64_free(zone->uz_xdomain);
2791 free(zone->uz_ctlname, M_UMA);
2792 for (i = 0; i < vm_ndomains; i++)
2793 ZDOM_LOCK_FINI(ZDOM_GET(zone, i));
2794 ZONE_CROSS_LOCK_FINI(zone);
2798 zone_foreach_unlocked(void (*zfunc)(uma_zone_t, void *arg), void *arg)
2803 LIST_FOREACH(keg, &uma_kegs, uk_link) {
2804 LIST_FOREACH(zone, &keg->uk_zones, uz_link)
2807 LIST_FOREACH(zone, &uma_cachezones, uz_link)
2812 * Traverses every zone in the system and calls a callback
2815 * zfunc A pointer to a function which accepts a zone
2822 zone_foreach(void (*zfunc)(uma_zone_t, void *arg), void *arg)
2825 rw_rlock(&uma_rwlock);
2826 zone_foreach_unlocked(zfunc, arg);
2827 rw_runlock(&uma_rwlock);
2831 * Initialize the kernel memory allocator. This is done after pages can be
2832 * allocated but before general KVA is available.
2835 uma_startup1(vm_offset_t virtual_avail)
2837 struct uma_zctor_args args;
2838 size_t ksize, zsize, size;
2839 uma_keg_t primarykeg;
2844 bootstart = bootmem = virtual_avail;
2846 rw_init(&uma_rwlock, "UMA lock");
2847 sx_init(&uma_reclaim_lock, "umareclaim");
2849 ksize = sizeof(struct uma_keg) +
2850 (sizeof(struct uma_domain) * vm_ndomains);
2851 ksize = roundup(ksize, UMA_SUPER_ALIGN);
2852 zsize = sizeof(struct uma_zone) +
2853 (sizeof(struct uma_cache) * (mp_maxid + 1)) +
2854 (sizeof(struct uma_zone_domain) * vm_ndomains);
2855 zsize = roundup(zsize, UMA_SUPER_ALIGN);
2857 /* Allocate the zone of zones, zone of kegs, and zone of zones keg. */
2858 size = (zsize * 2) + ksize;
2859 for (domain = 0; domain < vm_ndomains; domain++) {
2860 m = (uintptr_t)startup_alloc(NULL, size, domain, &pflag,
2865 zones = (uma_zone_t)m;
2867 kegs = (uma_zone_t)m;
2869 primarykeg = (uma_keg_t)m;
2871 /* "manually" create the initial zone */
2872 memset(&args, 0, sizeof(args));
2873 args.name = "UMA Kegs";
2875 args.ctor = keg_ctor;
2876 args.dtor = keg_dtor;
2877 args.uminit = zero_init;
2879 args.keg = primarykeg;
2880 args.align = UMA_SUPER_ALIGN - 1;
2881 args.flags = UMA_ZFLAG_INTERNAL;
2882 zone_ctor(kegs, zsize, &args, M_WAITOK);
2884 args.name = "UMA Zones";
2886 args.ctor = zone_ctor;
2887 args.dtor = zone_dtor;
2888 args.uminit = zero_init;
2891 args.align = UMA_SUPER_ALIGN - 1;
2892 args.flags = UMA_ZFLAG_INTERNAL;
2893 zone_ctor(zones, zsize, &args, M_WAITOK);
2895 /* Now make zones for slab headers */
2896 slabzones[0] = uma_zcreate("UMA Slabs 0", SLABZONE0_SIZE,
2897 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZFLAG_INTERNAL);
2898 slabzones[1] = uma_zcreate("UMA Slabs 1", SLABZONE1_SIZE,
2899 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZFLAG_INTERNAL);
2901 hashzone = uma_zcreate("UMA Hash",
2902 sizeof(struct slabhead *) * UMA_HASH_SIZE_INIT,
2903 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZFLAG_INTERNAL);
2909 #ifndef UMA_MD_SMALL_ALLOC
2910 extern void vm_radix_reserve_kva(void);
2914 * Advertise the availability of normal kva allocations and switch to
2915 * the default back-end allocator. Marks the KVA we consumed on startup
2916 * as used in the map.
2922 if (bootstart != bootmem) {
2923 vm_map_lock(kernel_map);
2924 (void)vm_map_insert(kernel_map, NULL, 0, bootstart, bootmem,
2925 VM_PROT_RW, VM_PROT_RW, MAP_NOFAULT);
2926 vm_map_unlock(kernel_map);
2929 #ifndef UMA_MD_SMALL_ALLOC
2930 /* Set up radix zone to use noobj_alloc. */
2931 vm_radix_reserve_kva();
2935 zone_foreach_unlocked(zone_kva_available, NULL);
2940 * Allocate counters as early as possible so that boot-time allocations are
2941 * accounted more precisely.
2944 uma_startup_pcpu(void *arg __unused)
2947 zone_foreach_unlocked(zone_alloc_counters, NULL);
2950 SYSINIT(uma_startup_pcpu, SI_SUB_COUNTER, SI_ORDER_ANY, uma_startup_pcpu, NULL);
2953 * Finish our initialization steps.
2956 uma_startup3(void *arg __unused)
2960 TUNABLE_INT_FETCH("vm.debug.divisor", &dbg_divisor);
2961 uma_dbg_cnt = counter_u64_alloc(M_WAITOK);
2962 uma_skip_cnt = counter_u64_alloc(M_WAITOK);
2964 zone_foreach_unlocked(zone_alloc_sysctl, NULL);
2965 callout_init(&uma_callout, 1);
2966 callout_reset(&uma_callout, UMA_TIMEOUT * hz, uma_timeout, NULL);
2967 booted = BOOT_RUNNING;
2969 EVENTHANDLER_REGISTER(shutdown_post_sync, uma_shutdown, NULL,
2970 EVENTHANDLER_PRI_FIRST);
2972 SYSINIT(uma_startup3, SI_SUB_VM_CONF, SI_ORDER_SECOND, uma_startup3, NULL);
2978 booted = BOOT_SHUTDOWN;
2982 uma_kcreate(uma_zone_t zone, size_t size, uma_init uminit, uma_fini fini,
2983 int align, uint32_t flags)
2985 struct uma_kctor_args args;
2988 args.uminit = uminit;
2990 args.align = (align == UMA_ALIGN_CACHE) ? uma_align_cache : align;
2993 return (zone_alloc_item(kegs, &args, UMA_ANYDOMAIN, M_WAITOK));
2996 /* Public functions */
2999 uma_set_align(int align)
3002 if (align != UMA_ALIGN_CACHE)
3003 uma_align_cache = align;
3008 uma_zcreate(const char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
3009 uma_init uminit, uma_fini fini, int align, uint32_t flags)
3012 struct uma_zctor_args args;
3015 KASSERT(powerof2(align + 1), ("invalid zone alignment %d for \"%s\"",
3018 /* This stuff is essential for the zone ctor */
3019 memset(&args, 0, sizeof(args));
3024 args.uminit = uminit;
3028 * Inject procedures which check for memory use after free if we are
3029 * allowed to scramble the memory while it is not allocated. This
3030 * requires that: UMA is actually able to access the memory, no init
3031 * or fini procedures, no dependency on the initial value of the
3032 * memory, and no (legitimate) use of the memory after free. Note,
3033 * the ctor and dtor do not need to be empty.
3035 if ((!(flags & (UMA_ZONE_ZINIT | UMA_ZONE_NOTOUCH |
3036 UMA_ZONE_NOFREE))) && uminit == NULL && fini == NULL) {
3037 args.uminit = trash_init;
3038 args.fini = trash_fini;
3045 sx_slock(&uma_reclaim_lock);
3046 res = zone_alloc_item(zones, &args, UMA_ANYDOMAIN, M_WAITOK);
3047 sx_sunlock(&uma_reclaim_lock);
3054 uma_zsecond_create(const char *name, uma_ctor ctor, uma_dtor dtor,
3055 uma_init zinit, uma_fini zfini, uma_zone_t primary)
3057 struct uma_zctor_args args;
3061 keg = primary->uz_keg;
3062 memset(&args, 0, sizeof(args));
3064 args.size = keg->uk_size;
3067 args.uminit = zinit;
3069 args.align = keg->uk_align;
3070 args.flags = keg->uk_flags | UMA_ZONE_SECONDARY;
3073 sx_slock(&uma_reclaim_lock);
3074 res = zone_alloc_item(zones, &args, UMA_ANYDOMAIN, M_WAITOK);
3075 sx_sunlock(&uma_reclaim_lock);
3082 uma_zcache_create(const char *name, int size, uma_ctor ctor, uma_dtor dtor,
3083 uma_init zinit, uma_fini zfini, uma_import zimport, uma_release zrelease,
3084 void *arg, int flags)
3086 struct uma_zctor_args args;
3088 memset(&args, 0, sizeof(args));
3093 args.uminit = zinit;
3095 args.import = zimport;
3096 args.release = zrelease;
3099 args.flags = flags | UMA_ZFLAG_CACHE;
3101 return (zone_alloc_item(zones, &args, UMA_ANYDOMAIN, M_WAITOK));
3106 uma_zdestroy(uma_zone_t zone)
3110 * Large slabs are expensive to reclaim, so don't bother doing
3111 * unnecessary work if we're shutting down.
3113 if (booted == BOOT_SHUTDOWN &&
3114 zone->uz_fini == NULL && zone->uz_release == zone_release)
3116 sx_slock(&uma_reclaim_lock);
3117 zone_free_item(zones, zone, NULL, SKIP_NONE);
3118 sx_sunlock(&uma_reclaim_lock);
3122 uma_zwait(uma_zone_t zone)
3125 if ((zone->uz_flags & UMA_ZONE_SMR) != 0)
3126 uma_zfree_smr(zone, uma_zalloc_smr(zone, M_WAITOK));
3127 else if ((zone->uz_flags & UMA_ZONE_PCPU) != 0)
3128 uma_zfree_pcpu(zone, uma_zalloc_pcpu(zone, M_WAITOK));
3130 uma_zfree(zone, uma_zalloc(zone, M_WAITOK));
3134 uma_zalloc_pcpu_arg(uma_zone_t zone, void *udata, int flags)
3136 void *item, *pcpu_item;
3140 MPASS(zone->uz_flags & UMA_ZONE_PCPU);
3142 item = uma_zalloc_arg(zone, udata, flags & ~M_ZERO);
3145 pcpu_item = zpcpu_base_to_offset(item);
3146 if (flags & M_ZERO) {
3148 for (i = 0; i <= mp_maxid; i++)
3149 bzero(zpcpu_get_cpu(pcpu_item, i), zone->uz_size);
3151 bzero(item, zone->uz_size);
3158 * A stub while both regular and pcpu cases are identical.
3161 uma_zfree_pcpu_arg(uma_zone_t zone, void *pcpu_item, void *udata)
3166 MPASS(zone->uz_flags & UMA_ZONE_PCPU);
3168 item = zpcpu_offset_to_base(pcpu_item);
3169 uma_zfree_arg(zone, item, udata);
3172 static inline void *
3173 item_ctor(uma_zone_t zone, int uz_flags, int size, void *udata, int flags,
3179 skipdbg = uma_dbg_zskip(zone, item);
3180 if (!skipdbg && (zone->uz_flags & UMA_ZFLAG_TRASH) != 0 &&
3181 zone->uz_ctor != trash_ctor)
3182 trash_ctor(item, size, udata, flags);
3184 /* Check flags before loading ctor pointer. */
3185 if (__predict_false((uz_flags & UMA_ZFLAG_CTORDTOR) != 0) &&
3186 __predict_false(zone->uz_ctor != NULL) &&
3187 zone->uz_ctor(item, size, udata, flags) != 0) {
3188 counter_u64_add(zone->uz_fails, 1);
3189 zone_free_item(zone, item, udata, SKIP_DTOR | SKIP_CNT);
3194 uma_dbg_alloc(zone, NULL, item);
3196 if (__predict_false(flags & M_ZERO))
3197 return (memset(item, 0, size));
3203 item_dtor(uma_zone_t zone, void *item, int size, void *udata,
3204 enum zfreeskip skip)
3209 skipdbg = uma_dbg_zskip(zone, item);
3210 if (skip == SKIP_NONE && !skipdbg) {
3211 if ((zone->uz_flags & UMA_ZONE_MALLOC) != 0)
3212 uma_dbg_free(zone, udata, item);
3214 uma_dbg_free(zone, NULL, item);
3217 if (__predict_true(skip < SKIP_DTOR)) {
3218 if (zone->uz_dtor != NULL)
3219 zone->uz_dtor(item, size, udata);
3221 if (!skipdbg && (zone->uz_flags & UMA_ZFLAG_TRASH) != 0 &&
3222 zone->uz_dtor != trash_dtor)
3223 trash_dtor(item, size, udata);
3230 item_domain(void *item)
3234 domain = vm_phys_domain(vtophys(item));
3235 KASSERT(domain >= 0 && domain < vm_ndomains,
3236 ("%s: unknown domain for item %p", __func__, item));
3241 #if defined(INVARIANTS) || defined(DEBUG_MEMGUARD) || defined(WITNESS)
3242 #define UMA_ZALLOC_DEBUG
3244 uma_zalloc_debug(uma_zone_t zone, void **itemp, void *udata, int flags)
3250 if (flags & M_WAITOK) {
3251 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
3252 "uma_zalloc_debug: zone \"%s\"", zone->uz_name);
3257 KASSERT((flags & M_EXEC) == 0,
3258 ("uma_zalloc_debug: called with M_EXEC"));
3259 KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
3260 ("uma_zalloc_debug: called within spinlock or critical section"));
3261 KASSERT((zone->uz_flags & UMA_ZONE_PCPU) == 0 || (flags & M_ZERO) == 0,
3262 ("uma_zalloc_debug: allocating from a pcpu zone with M_ZERO"));
3265 #ifdef DEBUG_MEMGUARD
3266 if ((zone->uz_flags & UMA_ZONE_SMR) == 0 && memguard_cmp_zone(zone)) {
3268 item = memguard_alloc(zone->uz_size, flags);
3270 error = EJUSTRETURN;
3271 if (zone->uz_init != NULL &&
3272 zone->uz_init(item, zone->uz_size, flags) != 0) {
3276 if (zone->uz_ctor != NULL &&
3277 zone->uz_ctor(item, zone->uz_size, udata,
3279 counter_u64_add(zone->uz_fails, 1);
3280 zone->uz_fini(item, zone->uz_size);
3287 /* This is unfortunate but should not be fatal. */
3294 uma_zfree_debug(uma_zone_t zone, void *item, void *udata)
3296 KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
3297 ("uma_zfree_debug: called with spinlock or critical section held"));
3299 #ifdef DEBUG_MEMGUARD
3300 if ((zone->uz_flags & UMA_ZONE_SMR) == 0 && is_memguard_addr(item)) {
3301 if (zone->uz_dtor != NULL)
3302 zone->uz_dtor(item, zone->uz_size, udata);
3303 if (zone->uz_fini != NULL)
3304 zone->uz_fini(item, zone->uz_size);
3305 memguard_free(item);
3306 return (EJUSTRETURN);
3313 static inline void *
3314 cache_alloc_item(uma_zone_t zone, uma_cache_t cache, uma_cache_bucket_t bucket,
3315 void *udata, int flags)
3320 item = cache_bucket_pop(cache, bucket);
3321 size = cache_uz_size(cache);
3322 uz_flags = cache_uz_flags(cache);
3324 return (item_ctor(zone, uz_flags, size, udata, flags, item));
3327 static __noinline void *
3328 cache_alloc_retry(uma_zone_t zone, uma_cache_t cache, void *udata, int flags)
3330 uma_cache_bucket_t bucket;
3333 while (cache_alloc(zone, cache, udata, flags)) {
3334 cache = &zone->uz_cpu[curcpu];
3335 bucket = &cache->uc_allocbucket;
3336 if (__predict_false(bucket->ucb_cnt == 0))
3338 return (cache_alloc_item(zone, cache, bucket, udata, flags));
3343 * We can not get a bucket so try to return a single item.
3345 if (zone->uz_flags & UMA_ZONE_FIRSTTOUCH)
3346 domain = PCPU_GET(domain);
3348 domain = UMA_ANYDOMAIN;
3349 return (zone_alloc_item(zone, udata, domain, flags));
3354 uma_zalloc_smr(uma_zone_t zone, int flags)
3356 uma_cache_bucket_t bucket;
3359 #ifdef UMA_ZALLOC_DEBUG
3362 KASSERT((zone->uz_flags & UMA_ZONE_SMR) != 0,
3363 ("uma_zalloc_arg: called with non-SMR zone."));
3364 if (uma_zalloc_debug(zone, &item, NULL, flags) == EJUSTRETURN)
3369 cache = &zone->uz_cpu[curcpu];
3370 bucket = &cache->uc_allocbucket;
3371 if (__predict_false(bucket->ucb_cnt == 0))
3372 return (cache_alloc_retry(zone, cache, NULL, flags));
3373 return (cache_alloc_item(zone, cache, bucket, NULL, flags));
3378 uma_zalloc_arg(uma_zone_t zone, void *udata, int flags)
3380 uma_cache_bucket_t bucket;
3383 /* Enable entropy collection for RANDOM_ENABLE_UMA kernel option */
3384 random_harvest_fast_uma(&zone, sizeof(zone), RANDOM_UMA);
3386 /* This is the fast path allocation */
3387 CTR3(KTR_UMA, "uma_zalloc_arg zone %s(%p) flags %d", zone->uz_name,
3390 #ifdef UMA_ZALLOC_DEBUG
3393 KASSERT((zone->uz_flags & UMA_ZONE_SMR) == 0,
3394 ("uma_zalloc_arg: called with SMR zone."));
3395 if (uma_zalloc_debug(zone, &item, udata, flags) == EJUSTRETURN)
3400 * If possible, allocate from the per-CPU cache. There are two
3401 * requirements for safe access to the per-CPU cache: (1) the thread
3402 * accessing the cache must not be preempted or yield during access,
3403 * and (2) the thread must not migrate CPUs without switching which
3404 * cache it accesses. We rely on a critical section to prevent
3405 * preemption and migration. We release the critical section in
3406 * order to acquire the zone mutex if we are unable to allocate from
3407 * the current cache; when we re-acquire the critical section, we
3408 * must detect and handle migration if it has occurred.
3411 cache = &zone->uz_cpu[curcpu];
3412 bucket = &cache->uc_allocbucket;
3413 if (__predict_false(bucket->ucb_cnt == 0))
3414 return (cache_alloc_retry(zone, cache, udata, flags));
3415 return (cache_alloc_item(zone, cache, bucket, udata, flags));
3419 * Replenish an alloc bucket and possibly restore an old one. Called in
3420 * a critical section. Returns in a critical section.
3422 * A false return value indicates an allocation failure.
3423 * A true return value indicates success and the caller should retry.
3425 static __noinline bool
3426 cache_alloc(uma_zone_t zone, uma_cache_t cache, void *udata, int flags)
3428 uma_bucket_t bucket;
3429 int curdomain, domain;
3432 CRITICAL_ASSERT(curthread);
3435 * If we have run out of items in our alloc bucket see
3436 * if we can switch with the free bucket.
3438 * SMR Zones can't re-use the free bucket until the sequence has
3441 if ((cache_uz_flags(cache) & UMA_ZONE_SMR) == 0 &&
3442 cache->uc_freebucket.ucb_cnt != 0) {
3443 cache_bucket_swap(&cache->uc_freebucket,
3444 &cache->uc_allocbucket);
3449 * Discard any empty allocation bucket while we hold no locks.
3451 bucket = cache_bucket_unload_alloc(cache);
3454 if (bucket != NULL) {
3455 KASSERT(bucket->ub_cnt == 0,
3456 ("cache_alloc: Entered with non-empty alloc bucket."));
3457 bucket_free(zone, bucket, udata);
3461 * Attempt to retrieve the item from the per-CPU cache has failed, so
3462 * we must go back to the zone. This requires the zdom lock, so we
3463 * must drop the critical section, then re-acquire it when we go back
3464 * to the cache. Since the critical section is released, we may be
3465 * preempted or migrate. As such, make sure not to maintain any
3466 * thread-local state specific to the cache from prior to releasing
3467 * the critical section.
3469 domain = PCPU_GET(domain);
3470 if ((cache_uz_flags(cache) & UMA_ZONE_ROUNDROBIN) != 0 ||
3471 VM_DOMAIN_EMPTY(domain))
3472 domain = zone_domain_highest(zone, domain);
3473 bucket = cache_fetch_bucket(zone, cache, domain);
3474 if (bucket == NULL && zone->uz_bucket_size != 0 && !bucketdisable) {
3475 bucket = zone_alloc_bucket(zone, udata, domain, flags);
3481 CTR3(KTR_UMA, "uma_zalloc: zone %s(%p) bucket zone returned %p",
3482 zone->uz_name, zone, bucket);
3483 if (bucket == NULL) {
3489 * See if we lost the race or were migrated. Cache the
3490 * initialized bucket to make this less likely or claim
3491 * the memory directly.
3494 cache = &zone->uz_cpu[curcpu];
3495 if (cache->uc_allocbucket.ucb_bucket == NULL &&
3496 ((cache_uz_flags(cache) & UMA_ZONE_FIRSTTOUCH) == 0 ||
3497 (curdomain = PCPU_GET(domain)) == domain ||
3498 VM_DOMAIN_EMPTY(curdomain))) {
3500 atomic_add_long(&ZDOM_GET(zone, domain)->uzd_imax,
3502 cache_bucket_load_alloc(cache, bucket);
3507 * We lost the race, release this bucket and start over.
3510 zone_put_bucket(zone, domain, bucket, udata, false);
3517 uma_zalloc_domain(uma_zone_t zone, void *udata, int domain, int flags)
3520 uma_bucket_t bucket;
3521 uma_zone_domain_t zdom;
3525 /* Enable entropy collection for RANDOM_ENABLE_UMA kernel option */
3526 random_harvest_fast_uma(&zone, sizeof(zone), RANDOM_UMA);
3528 /* This is the fast path allocation */
3529 CTR4(KTR_UMA, "uma_zalloc_domain zone %s(%p) domain %d flags %d",
3530 zone->uz_name, zone, domain, flags);
3532 if (flags & M_WAITOK) {
3533 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
3534 "uma_zalloc_domain: zone \"%s\"", zone->uz_name);
3536 KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
3537 ("uma_zalloc_domain: called with spinlock or critical section held"));
3538 KASSERT((zone->uz_flags & UMA_ZONE_SMR) == 0,
3539 ("uma_zalloc_domain: called with SMR zone."));
3541 KASSERT((zone->uz_flags & UMA_ZONE_FIRSTTOUCH) != 0,
3542 ("uma_zalloc_domain: called with non-FIRSTTOUCH zone."));
3544 if (vm_ndomains == 1)
3545 return (uma_zalloc_arg(zone, udata, flags));
3548 * Try to allocate from the bucket cache before falling back to the keg.
3549 * We could try harder and attempt to allocate from per-CPU caches or
3550 * the per-domain cross-domain buckets, but the complexity is probably
3551 * not worth it. It is more important that frees of previous
3552 * cross-domain allocations do not blow up the cache.
3554 zdom = zone_domain_lock(zone, domain);
3555 if ((bucket = zone_fetch_bucket(zone, zdom, false)) != NULL) {
3556 item = bucket->ub_bucket[bucket->ub_cnt - 1];
3558 bucket->ub_bucket[bucket->ub_cnt - 1] = NULL;
3561 zone_put_bucket(zone, domain, bucket, udata, true);
3562 item = item_ctor(zone, zone->uz_flags, zone->uz_size, udata,
3565 KASSERT(item_domain(item) == domain,
3566 ("%s: bucket cache item %p from wrong domain",
3568 counter_u64_add(zone->uz_allocs, 1);
3573 return (zone_alloc_item(zone, udata, domain, flags));
3575 return (uma_zalloc_arg(zone, udata, flags));
3580 * Find a slab with some space. Prefer slabs that are partially used over those
3581 * that are totally full. This helps to reduce fragmentation.
3583 * If 'rr' is 1, search all domains starting from 'domain'. Otherwise check
3587 keg_first_slab(uma_keg_t keg, int domain, bool rr)
3593 KASSERT(domain >= 0 && domain < vm_ndomains,
3594 ("keg_first_slab: domain %d out of range", domain));
3595 KEG_LOCK_ASSERT(keg, domain);
3600 dom = &keg->uk_domain[domain];
3601 if ((slab = LIST_FIRST(&dom->ud_part_slab)) != NULL)
3603 if ((slab = LIST_FIRST(&dom->ud_free_slab)) != NULL) {
3604 LIST_REMOVE(slab, us_link);
3605 dom->ud_free_slabs--;
3606 LIST_INSERT_HEAD(&dom->ud_part_slab, slab, us_link);
3610 domain = (domain + 1) % vm_ndomains;
3611 } while (domain != start);
3617 * Fetch an existing slab from a free or partial list. Returns with the
3618 * keg domain lock held if a slab was found or unlocked if not.
3621 keg_fetch_free_slab(uma_keg_t keg, int domain, bool rr, int flags)
3626 /* HASH has a single free list. */
3627 if ((keg->uk_flags & UMA_ZFLAG_HASH) != 0)
3630 KEG_LOCK(keg, domain);
3631 reserve = (flags & M_USE_RESERVE) != 0 ? 0 : keg->uk_reserve;
3632 if (keg->uk_domain[domain].ud_free_items <= reserve ||
3633 (slab = keg_first_slab(keg, domain, rr)) == NULL) {
3634 KEG_UNLOCK(keg, domain);
3641 keg_fetch_slab(uma_keg_t keg, uma_zone_t zone, int rdomain, const int flags)
3643 struct vm_domainset_iter di;
3650 * Use the keg's policy if upper layers haven't already specified a
3651 * domain (as happens with first-touch zones).
3653 * To avoid races we run the iterator with the keg lock held, but that
3654 * means that we cannot allow the vm_domainset layer to sleep. Thus,
3655 * clear M_WAITOK and handle low memory conditions locally.
3657 rr = rdomain == UMA_ANYDOMAIN;
3659 aflags = (flags & ~M_WAITOK) | M_NOWAIT;
3660 vm_domainset_iter_policy_ref_init(&di, &keg->uk_dr, &domain,
3668 slab = keg_fetch_free_slab(keg, domain, rr, flags);
3673 * M_NOVM means don't ask at all!
3678 slab = keg_alloc_slab(keg, zone, domain, flags, aflags);
3681 if (!rr && (flags & M_WAITOK) == 0)
3683 if (rr && vm_domainset_iter_policy(&di, &domain) != 0) {
3684 if ((flags & M_WAITOK) != 0) {
3685 vm_wait_doms(&keg->uk_dr.dr_policy->ds_mask, 0);
3693 * We might not have been able to get a slab but another cpu
3694 * could have while we were unlocked. Check again before we
3697 if ((slab = keg_fetch_free_slab(keg, domain, rr, flags)) != NULL)
3704 slab_alloc_item(uma_keg_t keg, uma_slab_t slab)
3710 KEG_LOCK_ASSERT(keg, slab->us_domain);
3712 dom = &keg->uk_domain[slab->us_domain];
3713 freei = BIT_FFS(keg->uk_ipers, &slab->us_free) - 1;
3714 BIT_CLR(keg->uk_ipers, freei, &slab->us_free);
3715 item = slab_item(slab, keg, freei);
3716 slab->us_freecount--;
3717 dom->ud_free_items--;
3720 * Move this slab to the full list. It must be on the partial list, so
3721 * we do not need to update the free slab count. In particular,
3722 * keg_fetch_slab() always returns slabs on the partial list.
3724 if (slab->us_freecount == 0) {
3725 LIST_REMOVE(slab, us_link);
3726 LIST_INSERT_HEAD(&dom->ud_full_slab, slab, us_link);
3733 zone_import(void *arg, void **bucket, int max, int domain, int flags)
3747 /* Try to keep the buckets totally full */
3748 for (i = 0; i < max; ) {
3749 if ((slab = keg_fetch_slab(keg, zone, domain, flags)) == NULL)
3752 stripe = howmany(max, vm_ndomains);
3754 dom = &keg->uk_domain[slab->us_domain];
3756 bucket[i++] = slab_alloc_item(keg, slab);
3757 if (dom->ud_free_items <= keg->uk_reserve) {
3759 * Avoid depleting the reserve after a
3760 * successful item allocation, even if
3761 * M_USE_RESERVE is specified.
3763 KEG_UNLOCK(keg, slab->us_domain);
3768 * If the zone is striped we pick a new slab for every
3769 * N allocations. Eliminating this conditional will
3770 * instead pick a new domain for each bucket rather
3771 * than stripe within each bucket. The current option
3772 * produces more fragmentation and requires more cpu
3773 * time but yields better distribution.
3775 if ((zone->uz_flags & UMA_ZONE_ROUNDROBIN) != 0 &&
3776 vm_ndomains > 1 && --stripe == 0)
3779 } while (slab->us_freecount != 0 && i < max);
3780 KEG_UNLOCK(keg, slab->us_domain);
3782 /* Don't block if we allocated any successfully. */
3791 zone_alloc_limit_hard(uma_zone_t zone, int count, int flags)
3793 uint64_t old, new, total, max;
3796 * The hard case. We're going to sleep because there were existing
3797 * sleepers or because we ran out of items. This routine enforces
3798 * fairness by keeping fifo order.
3800 * First release our ill gotten gains and make some noise.
3803 zone_free_limit(zone, count);
3804 zone_log_warning(zone);
3805 zone_maxaction(zone);
3806 if (flags & M_NOWAIT)
3810 * We need to allocate an item or set ourself as a sleeper
3811 * while the sleepq lock is held to avoid wakeup races. This
3812 * is essentially a home rolled semaphore.
3814 sleepq_lock(&zone->uz_max_items);
3815 old = zone->uz_items;
3817 MPASS(UZ_ITEMS_SLEEPERS(old) < UZ_ITEMS_SLEEPERS_MAX);
3818 /* Cache the max since we will evaluate twice. */
3819 max = zone->uz_max_items;
3820 if (UZ_ITEMS_SLEEPERS(old) != 0 ||
3821 UZ_ITEMS_COUNT(old) >= max)
3822 new = old + UZ_ITEMS_SLEEPER;
3824 new = old + MIN(count, max - old);
3825 } while (atomic_fcmpset_64(&zone->uz_items, &old, new) == 0);
3827 /* We may have successfully allocated under the sleepq lock. */
3828 if (UZ_ITEMS_SLEEPERS(new) == 0) {
3829 sleepq_release(&zone->uz_max_items);
3834 * This is in a different cacheline from uz_items so that we
3835 * don't constantly invalidate the fastpath cacheline when we
3836 * adjust item counts. This could be limited to toggling on
3839 atomic_add_32(&zone->uz_sleepers, 1);
3840 atomic_add_64(&zone->uz_sleeps, 1);
3843 * We have added ourselves as a sleeper. The sleepq lock
3844 * protects us from wakeup races. Sleep now and then retry.
3846 sleepq_add(&zone->uz_max_items, NULL, "zonelimit", 0, 0);
3847 sleepq_wait(&zone->uz_max_items, PVM);
3850 * After wakeup, remove ourselves as a sleeper and try
3851 * again. We no longer have the sleepq lock for protection.
3853 * Subract ourselves as a sleeper while attempting to add
3856 atomic_subtract_32(&zone->uz_sleepers, 1);
3857 old = atomic_fetchadd_64(&zone->uz_items,
3858 -(UZ_ITEMS_SLEEPER - count));
3859 /* We're no longer a sleeper. */
3860 old -= UZ_ITEMS_SLEEPER;
3863 * If we're still at the limit, restart. Notably do not
3864 * block on other sleepers. Cache the max value to protect
3865 * against changes via sysctl.
3867 total = UZ_ITEMS_COUNT(old);
3868 max = zone->uz_max_items;
3871 /* Truncate if necessary, otherwise wake other sleepers. */
3872 if (total + count > max) {
3873 zone_free_limit(zone, total + count - max);
3874 count = max - total;
3875 } else if (total + count < max && UZ_ITEMS_SLEEPERS(old) != 0)
3876 wakeup_one(&zone->uz_max_items);
3883 * Allocate 'count' items from our max_items limit. Returns the number
3884 * available. If M_NOWAIT is not specified it will sleep until at least
3885 * one item can be allocated.
3888 zone_alloc_limit(uma_zone_t zone, int count, int flags)
3893 max = zone->uz_max_items;
3897 * We expect normal allocations to succeed with a simple
3900 old = atomic_fetchadd_64(&zone->uz_items, count);
3901 if (__predict_true(old + count <= max))
3905 * If we had some items and no sleepers just return the
3906 * truncated value. We have to release the excess space
3907 * though because that may wake sleepers who weren't woken
3908 * because we were temporarily over the limit.
3911 zone_free_limit(zone, (old + count) - max);
3914 return (zone_alloc_limit_hard(zone, count, flags));
3918 * Free a number of items back to the limit.
3921 zone_free_limit(uma_zone_t zone, int count)
3928 * In the common case we either have no sleepers or
3929 * are still over the limit and can just return.
3931 old = atomic_fetchadd_64(&zone->uz_items, -count);
3932 if (__predict_true(UZ_ITEMS_SLEEPERS(old) == 0 ||
3933 UZ_ITEMS_COUNT(old) - count >= zone->uz_max_items))
3937 * Moderate the rate of wakeups. Sleepers will continue
3938 * to generate wakeups if necessary.
3940 wakeup_one(&zone->uz_max_items);
3944 zone_alloc_bucket(uma_zone_t zone, void *udata, int domain, int flags)
3946 uma_bucket_t bucket;
3949 CTR3(KTR_UMA, "zone_alloc_bucket zone %s(%p) domain %d", zone->uz_name,
3952 /* Avoid allocs targeting empty domains. */
3953 if (domain != UMA_ANYDOMAIN && VM_DOMAIN_EMPTY(domain))
3954 domain = UMA_ANYDOMAIN;
3955 else if ((zone->uz_flags & UMA_ZONE_ROUNDROBIN) != 0)
3956 domain = UMA_ANYDOMAIN;
3958 if (zone->uz_max_items > 0)
3959 maxbucket = zone_alloc_limit(zone, zone->uz_bucket_size,
3962 maxbucket = zone->uz_bucket_size;
3966 /* Don't wait for buckets, preserve caller's NOVM setting. */
3967 bucket = bucket_alloc(zone, udata, M_NOWAIT | (flags & M_NOVM));
3968 if (bucket == NULL) {
3973 bucket->ub_cnt = zone->uz_import(zone->uz_arg, bucket->ub_bucket,
3974 MIN(maxbucket, bucket->ub_entries), domain, flags);
3977 * Initialize the memory if necessary.
3979 if (bucket->ub_cnt != 0 && zone->uz_init != NULL) {
3982 for (i = 0; i < bucket->ub_cnt; i++)
3983 if (zone->uz_init(bucket->ub_bucket[i], zone->uz_size,
3987 * If we couldn't initialize the whole bucket, put the
3988 * rest back onto the freelist.
3990 if (i != bucket->ub_cnt) {
3991 zone->uz_release(zone->uz_arg, &bucket->ub_bucket[i],
3992 bucket->ub_cnt - i);
3994 bzero(&bucket->ub_bucket[i],
3995 sizeof(void *) * (bucket->ub_cnt - i));
4001 cnt = bucket->ub_cnt;
4002 if (bucket->ub_cnt == 0) {
4003 bucket_free(zone, bucket, udata);
4004 counter_u64_add(zone->uz_fails, 1);
4008 if (zone->uz_max_items > 0 && cnt < maxbucket)
4009 zone_free_limit(zone, maxbucket - cnt);
4015 * Allocates a single item from a zone.
4018 * zone The zone to alloc for.
4019 * udata The data to be passed to the constructor.
4020 * domain The domain to allocate from or UMA_ANYDOMAIN.
4021 * flags M_WAITOK, M_NOWAIT, M_ZERO.
4024 * NULL if there is no memory and M_NOWAIT is set
4025 * An item if successful
4029 zone_alloc_item(uma_zone_t zone, void *udata, int domain, int flags)
4033 if (zone->uz_max_items > 0 && zone_alloc_limit(zone, 1, flags) == 0) {
4034 counter_u64_add(zone->uz_fails, 1);
4038 /* Avoid allocs targeting empty domains. */
4039 if (domain != UMA_ANYDOMAIN && VM_DOMAIN_EMPTY(domain))
4040 domain = UMA_ANYDOMAIN;
4042 if (zone->uz_import(zone->uz_arg, &item, 1, domain, flags) != 1)
4046 * We have to call both the zone's init (not the keg's init)
4047 * and the zone's ctor. This is because the item is going from
4048 * a keg slab directly to the user, and the user is expecting it
4049 * to be both zone-init'd as well as zone-ctor'd.
4051 if (zone->uz_init != NULL) {
4052 if (zone->uz_init(item, zone->uz_size, flags) != 0) {
4053 zone_free_item(zone, item, udata, SKIP_FINI | SKIP_CNT);
4057 item = item_ctor(zone, zone->uz_flags, zone->uz_size, udata, flags,
4062 counter_u64_add(zone->uz_allocs, 1);
4063 CTR3(KTR_UMA, "zone_alloc_item item %p from %s(%p)", item,
4064 zone->uz_name, zone);
4069 counter_u64_add(zone->uz_fails, 1);
4071 if (zone->uz_max_items > 0)
4072 zone_free_limit(zone, 1);
4073 CTR2(KTR_UMA, "zone_alloc_item failed from %s(%p)",
4074 zone->uz_name, zone);
4081 uma_zfree_smr(uma_zone_t zone, void *item)
4084 uma_cache_bucket_t bucket;
4085 int itemdomain, uz_flags;
4087 #ifdef UMA_ZALLOC_DEBUG
4088 KASSERT((zone->uz_flags & UMA_ZONE_SMR) != 0,
4089 ("uma_zfree_smr: called with non-SMR zone."));
4090 KASSERT(item != NULL, ("uma_zfree_smr: Called with NULL pointer."));
4091 SMR_ASSERT_NOT_ENTERED(zone->uz_smr);
4092 if (uma_zfree_debug(zone, item, NULL) == EJUSTRETURN)
4095 cache = &zone->uz_cpu[curcpu];
4096 uz_flags = cache_uz_flags(cache);
4099 if ((uz_flags & UMA_ZONE_FIRSTTOUCH) != 0)
4100 itemdomain = item_domain(item);
4104 cache = &zone->uz_cpu[curcpu];
4105 /* SMR Zones must free to the free bucket. */
4106 bucket = &cache->uc_freebucket;
4108 if ((uz_flags & UMA_ZONE_FIRSTTOUCH) != 0 &&
4109 PCPU_GET(domain) != itemdomain) {
4110 bucket = &cache->uc_crossbucket;
4113 if (__predict_true(bucket->ucb_cnt < bucket->ucb_entries)) {
4114 cache_bucket_push(cache, bucket, item);
4118 } while (cache_free(zone, cache, NULL, item, itemdomain));
4122 * If nothing else caught this, we'll just do an internal free.
4124 zone_free_item(zone, item, NULL, SKIP_NONE);
4129 uma_zfree_arg(uma_zone_t zone, void *item, void *udata)
4132 uma_cache_bucket_t bucket;
4133 int itemdomain, uz_flags;
4135 /* Enable entropy collection for RANDOM_ENABLE_UMA kernel option */
4136 random_harvest_fast_uma(&zone, sizeof(zone), RANDOM_UMA);
4138 CTR2(KTR_UMA, "uma_zfree_arg zone %s(%p)", zone->uz_name, zone);
4140 #ifdef UMA_ZALLOC_DEBUG
4141 KASSERT((zone->uz_flags & UMA_ZONE_SMR) == 0,
4142 ("uma_zfree_arg: called with SMR zone."));
4143 if (uma_zfree_debug(zone, item, udata) == EJUSTRETURN)
4146 /* uma_zfree(..., NULL) does nothing, to match free(9). */
4151 * We are accessing the per-cpu cache without a critical section to
4152 * fetch size and flags. This is acceptable, if we are preempted we
4153 * will simply read another cpu's line.
4155 cache = &zone->uz_cpu[curcpu];
4156 uz_flags = cache_uz_flags(cache);
4157 if (UMA_ALWAYS_CTORDTOR ||
4158 __predict_false((uz_flags & UMA_ZFLAG_CTORDTOR) != 0))
4159 item_dtor(zone, item, cache_uz_size(cache), udata, SKIP_NONE);
4162 * The race here is acceptable. If we miss it we'll just have to wait
4163 * a little longer for the limits to be reset.
4165 if (__predict_false(uz_flags & UMA_ZFLAG_LIMIT)) {
4166 if (atomic_load_32(&zone->uz_sleepers) > 0)
4171 * If possible, free to the per-CPU cache. There are two
4172 * requirements for safe access to the per-CPU cache: (1) the thread
4173 * accessing the cache must not be preempted or yield during access,
4174 * and (2) the thread must not migrate CPUs without switching which
4175 * cache it accesses. We rely on a critical section to prevent
4176 * preemption and migration. We release the critical section in
4177 * order to acquire the zone mutex if we are unable to free to the
4178 * current cache; when we re-acquire the critical section, we must
4179 * detect and handle migration if it has occurred.
4183 if ((uz_flags & UMA_ZONE_FIRSTTOUCH) != 0)
4184 itemdomain = item_domain(item);
4188 cache = &zone->uz_cpu[curcpu];
4190 * Try to free into the allocbucket first to give LIFO
4191 * ordering for cache-hot datastructures. Spill over
4192 * into the freebucket if necessary. Alloc will swap
4193 * them if one runs dry.
4195 bucket = &cache->uc_allocbucket;
4197 if ((uz_flags & UMA_ZONE_FIRSTTOUCH) != 0 &&
4198 PCPU_GET(domain) != itemdomain) {
4199 bucket = &cache->uc_crossbucket;
4202 if (bucket->ucb_cnt == bucket->ucb_entries &&
4203 cache->uc_freebucket.ucb_cnt <
4204 cache->uc_freebucket.ucb_entries)
4205 cache_bucket_swap(&cache->uc_freebucket,
4206 &cache->uc_allocbucket);
4207 if (__predict_true(bucket->ucb_cnt < bucket->ucb_entries)) {
4208 cache_bucket_push(cache, bucket, item);
4212 } while (cache_free(zone, cache, udata, item, itemdomain));
4216 * If nothing else caught this, we'll just do an internal free.
4219 zone_free_item(zone, item, udata, SKIP_DTOR);
4224 * sort crossdomain free buckets to domain correct buckets and cache
4228 zone_free_cross(uma_zone_t zone, uma_bucket_t bucket, void *udata)
4230 struct uma_bucketlist emptybuckets, fullbuckets;
4231 uma_zone_domain_t zdom;
4238 "uma_zfree: zone %s(%p) draining cross bucket %p",
4239 zone->uz_name, zone, bucket);
4242 * It is possible for buckets to arrive here out of order so we fetch
4243 * the current smr seq rather than accepting the bucket's.
4245 seq = SMR_SEQ_INVALID;
4246 if ((zone->uz_flags & UMA_ZONE_SMR) != 0)
4247 seq = smr_advance(zone->uz_smr);
4250 * To avoid having ndomain * ndomain buckets for sorting we have a
4251 * lock on the current crossfree bucket. A full matrix with
4252 * per-domain locking could be used if necessary.
4254 STAILQ_INIT(&emptybuckets);
4255 STAILQ_INIT(&fullbuckets);
4256 ZONE_CROSS_LOCK(zone);
4257 for (; bucket->ub_cnt > 0; bucket->ub_cnt--) {
4258 item = bucket->ub_bucket[bucket->ub_cnt - 1];
4259 domain = item_domain(item);
4260 zdom = ZDOM_GET(zone, domain);
4261 if (zdom->uzd_cross == NULL) {
4262 if ((b = STAILQ_FIRST(&emptybuckets)) != NULL) {
4263 STAILQ_REMOVE_HEAD(&emptybuckets, ub_link);
4264 zdom->uzd_cross = b;
4267 * Avoid allocating a bucket with the cross lock
4268 * held, since allocation can trigger a
4269 * cross-domain free and bucket zones may
4270 * allocate from each other.
4272 ZONE_CROSS_UNLOCK(zone);
4273 b = bucket_alloc(zone, udata, M_NOWAIT);
4276 ZONE_CROSS_LOCK(zone);
4277 if (zdom->uzd_cross != NULL) {
4278 STAILQ_INSERT_HEAD(&emptybuckets, b,
4281 zdom->uzd_cross = b;
4285 b = zdom->uzd_cross;
4286 b->ub_bucket[b->ub_cnt++] = item;
4288 if (b->ub_cnt == b->ub_entries) {
4289 STAILQ_INSERT_HEAD(&fullbuckets, b, ub_link);
4290 if ((b = STAILQ_FIRST(&emptybuckets)) != NULL)
4291 STAILQ_REMOVE_HEAD(&emptybuckets, ub_link);
4292 zdom->uzd_cross = b;
4295 ZONE_CROSS_UNLOCK(zone);
4297 if (bucket->ub_cnt == 0)
4298 bucket->ub_seq = SMR_SEQ_INVALID;
4299 bucket_free(zone, bucket, udata);
4301 while ((b = STAILQ_FIRST(&emptybuckets)) != NULL) {
4302 STAILQ_REMOVE_HEAD(&emptybuckets, ub_link);
4303 bucket_free(zone, b, udata);
4305 while ((b = STAILQ_FIRST(&fullbuckets)) != NULL) {
4306 STAILQ_REMOVE_HEAD(&fullbuckets, ub_link);
4307 domain = item_domain(b->ub_bucket[0]);
4308 zone_put_bucket(zone, domain, b, udata, true);
4314 zone_free_bucket(uma_zone_t zone, uma_bucket_t bucket, void *udata,
4315 int itemdomain, bool ws)
4320 * Buckets coming from the wrong domain will be entirely for the
4321 * only other domain on two domain systems. In this case we can
4322 * simply cache them. Otherwise we need to sort them back to
4325 if ((zone->uz_flags & UMA_ZONE_FIRSTTOUCH) != 0 &&
4326 vm_ndomains > 2 && PCPU_GET(domain) != itemdomain) {
4327 zone_free_cross(zone, bucket, udata);
4333 * Attempt to save the bucket in the zone's domain bucket cache.
4336 "uma_zfree: zone %s(%p) putting bucket %p on free list",
4337 zone->uz_name, zone, bucket);
4338 /* ub_cnt is pointing to the last free item */
4339 if ((zone->uz_flags & UMA_ZONE_ROUNDROBIN) != 0)
4340 itemdomain = zone_domain_lowest(zone, itemdomain);
4341 zone_put_bucket(zone, itemdomain, bucket, udata, ws);
4345 * Populate a free or cross bucket for the current cpu cache. Free any
4346 * existing full bucket either to the zone cache or back to the slab layer.
4348 * Enters and returns in a critical section. false return indicates that
4349 * we can not satisfy this free in the cache layer. true indicates that
4350 * the caller should retry.
4352 static __noinline bool
4353 cache_free(uma_zone_t zone, uma_cache_t cache, void *udata, void *item,
4356 uma_cache_bucket_t cbucket;
4357 uma_bucket_t newbucket, bucket;
4359 CRITICAL_ASSERT(curthread);
4361 if (zone->uz_bucket_size == 0)
4364 cache = &zone->uz_cpu[curcpu];
4368 * FIRSTTOUCH domains need to free to the correct zdom. When
4369 * enabled this is the zdom of the item. The bucket is the
4370 * cross bucket if the current domain and itemdomain do not match.
4372 cbucket = &cache->uc_freebucket;
4374 if ((cache_uz_flags(cache) & UMA_ZONE_FIRSTTOUCH) != 0) {
4375 if (PCPU_GET(domain) != itemdomain) {
4376 cbucket = &cache->uc_crossbucket;
4377 if (cbucket->ucb_cnt != 0)
4378 counter_u64_add(zone->uz_xdomain,
4383 bucket = cache_bucket_unload(cbucket);
4384 KASSERT(bucket == NULL || bucket->ub_cnt == bucket->ub_entries,
4385 ("cache_free: Entered with non-full free bucket."));
4387 /* We are no longer associated with this CPU. */
4391 * Don't let SMR zones operate without a free bucket. Force
4392 * a synchronize and re-use this one. We will only degrade
4393 * to a synchronize every bucket_size items rather than every
4394 * item if we fail to allocate a bucket.
4396 if ((zone->uz_flags & UMA_ZONE_SMR) != 0) {
4398 bucket->ub_seq = smr_advance(zone->uz_smr);
4399 newbucket = bucket_alloc(zone, udata, M_NOWAIT);
4400 if (newbucket == NULL && bucket != NULL) {
4401 bucket_drain(zone, bucket);
4405 } else if (!bucketdisable)
4406 newbucket = bucket_alloc(zone, udata, M_NOWAIT);
4409 zone_free_bucket(zone, bucket, udata, itemdomain, true);
4412 if ((bucket = newbucket) == NULL)
4414 cache = &zone->uz_cpu[curcpu];
4417 * Check to see if we should be populating the cross bucket. If it
4418 * is already populated we will fall through and attempt to populate
4421 if ((cache_uz_flags(cache) & UMA_ZONE_FIRSTTOUCH) != 0) {
4422 if (PCPU_GET(domain) != itemdomain &&
4423 cache->uc_crossbucket.ucb_bucket == NULL) {
4424 cache_bucket_load_cross(cache, bucket);
4430 * We may have lost the race to fill the bucket or switched CPUs.
4432 if (cache->uc_freebucket.ucb_bucket != NULL) {
4434 bucket_free(zone, bucket, udata);
4437 cache_bucket_load_free(cache, bucket);
4443 slab_free_item(uma_zone_t zone, uma_slab_t slab, void *item)
4450 KEG_LOCK_ASSERT(keg, slab->us_domain);
4452 /* Do we need to remove from any lists? */
4453 dom = &keg->uk_domain[slab->us_domain];
4454 if (slab->us_freecount + 1 == keg->uk_ipers) {
4455 LIST_REMOVE(slab, us_link);
4456 LIST_INSERT_HEAD(&dom->ud_free_slab, slab, us_link);
4457 dom->ud_free_slabs++;
4458 } else if (slab->us_freecount == 0) {
4459 LIST_REMOVE(slab, us_link);
4460 LIST_INSERT_HEAD(&dom->ud_part_slab, slab, us_link);
4463 /* Slab management. */
4464 freei = slab_item_index(slab, keg, item);
4465 BIT_SET(keg->uk_ipers, freei, &slab->us_free);
4466 slab->us_freecount++;
4468 /* Keg statistics. */
4469 dom->ud_free_items++;
4473 zone_release(void *arg, void **bucket, int cnt)
4486 if (__predict_false((zone->uz_flags & UMA_ZFLAG_HASH) != 0))
4487 lock = KEG_LOCK(keg, 0);
4488 for (i = 0; i < cnt; i++) {
4490 if (__predict_true((zone->uz_flags & UMA_ZFLAG_VTOSLAB) != 0)) {
4491 slab = vtoslab((vm_offset_t)item);
4493 mem = (uint8_t *)((uintptr_t)item & (~UMA_SLAB_MASK));
4494 if ((zone->uz_flags & UMA_ZFLAG_HASH) != 0)
4495 slab = hash_sfind(&keg->uk_hash, mem);
4497 slab = (uma_slab_t)(mem + keg->uk_pgoff);
4499 if (lock != KEG_LOCKPTR(keg, slab->us_domain)) {
4502 lock = KEG_LOCK(keg, slab->us_domain);
4504 slab_free_item(zone, slab, item);
4511 * Frees a single item to any zone.
4514 * zone The zone to free to
4515 * item The item we're freeing
4516 * udata User supplied data for the dtor
4517 * skip Skip dtors and finis
4519 static __noinline void
4520 zone_free_item(uma_zone_t zone, void *item, void *udata, enum zfreeskip skip)
4524 * If a free is sent directly to an SMR zone we have to
4525 * synchronize immediately because the item can instantly
4526 * be reallocated. This should only happen in degenerate
4527 * cases when no memory is available for per-cpu caches.
4529 if ((zone->uz_flags & UMA_ZONE_SMR) != 0 && skip == SKIP_NONE)
4530 smr_synchronize(zone->uz_smr);
4532 item_dtor(zone, item, zone->uz_size, udata, skip);
4534 if (skip < SKIP_FINI && zone->uz_fini)
4535 zone->uz_fini(item, zone->uz_size);
4537 zone->uz_release(zone->uz_arg, &item, 1);
4539 if (skip & SKIP_CNT)
4542 counter_u64_add(zone->uz_frees, 1);
4544 if (zone->uz_max_items > 0)
4545 zone_free_limit(zone, 1);
4550 uma_zone_set_max(uma_zone_t zone, int nitems)
4554 * If the limit is small, we may need to constrain the maximum per-CPU
4555 * cache size, or disable caching entirely.
4557 uma_zone_set_maxcache(zone, nitems);
4560 * XXX This can misbehave if the zone has any allocations with
4561 * no limit and a limit is imposed. There is currently no
4562 * way to clear a limit.
4565 zone->uz_max_items = nitems;
4566 zone->uz_flags |= UMA_ZFLAG_LIMIT;
4567 zone_update_caches(zone);
4568 /* We may need to wake waiters. */
4569 wakeup(&zone->uz_max_items);
4577 uma_zone_set_maxcache(uma_zone_t zone, int nitems)
4579 int bpcpu, bpdom, bsize, nb;
4584 * Compute a lower bound on the number of items that may be cached in
4585 * the zone. Each CPU gets at least two buckets, and for cross-domain
4586 * frees we use an additional bucket per CPU and per domain. Select the
4587 * largest bucket size that does not exceed half of the requested limit,
4588 * with the left over space given to the full bucket cache.
4593 if ((zone->uz_flags & UMA_ZONE_FIRSTTOUCH) != 0 && vm_ndomains > 1) {
4598 nb = bpcpu * mp_ncpus + bpdom * vm_ndomains;
4599 bsize = nitems / nb / 2;
4600 if (bsize > BUCKET_MAX)
4602 else if (bsize == 0 && nitems / nb > 0)
4604 zone->uz_bucket_size_max = zone->uz_bucket_size = bsize;
4605 if (zone->uz_bucket_size_min > zone->uz_bucket_size_max)
4606 zone->uz_bucket_size_min = zone->uz_bucket_size_max;
4607 zone->uz_bucket_max = nitems - nb * bsize;
4613 uma_zone_get_max(uma_zone_t zone)
4617 nitems = atomic_load_64(&zone->uz_max_items);
4624 uma_zone_set_warning(uma_zone_t zone, const char *warning)
4627 ZONE_ASSERT_COLD(zone);
4628 zone->uz_warning = warning;
4633 uma_zone_set_maxaction(uma_zone_t zone, uma_maxaction_t maxaction)
4636 ZONE_ASSERT_COLD(zone);
4637 TASK_INIT(&zone->uz_maxaction, 0, (task_fn_t *)maxaction, zone);
4642 uma_zone_get_cur(uma_zone_t zone)
4648 if (zone->uz_allocs != EARLY_COUNTER && zone->uz_frees != EARLY_COUNTER)
4649 nitems = counter_u64_fetch(zone->uz_allocs) -
4650 counter_u64_fetch(zone->uz_frees);
4652 nitems += atomic_load_64(&zone->uz_cpu[i].uc_allocs) -
4653 atomic_load_64(&zone->uz_cpu[i].uc_frees);
4655 return (nitems < 0 ? 0 : nitems);
4659 uma_zone_get_allocs(uma_zone_t zone)
4665 if (zone->uz_allocs != EARLY_COUNTER)
4666 nitems = counter_u64_fetch(zone->uz_allocs);
4668 nitems += atomic_load_64(&zone->uz_cpu[i].uc_allocs);
4674 uma_zone_get_frees(uma_zone_t zone)
4680 if (zone->uz_frees != EARLY_COUNTER)
4681 nitems = counter_u64_fetch(zone->uz_frees);
4683 nitems += atomic_load_64(&zone->uz_cpu[i].uc_frees);
4689 /* Used only for KEG_ASSERT_COLD(). */
4691 uma_keg_get_allocs(uma_keg_t keg)
4697 LIST_FOREACH(z, &keg->uk_zones, uz_link)
4698 nitems += uma_zone_get_allocs(z);
4706 uma_zone_set_init(uma_zone_t zone, uma_init uminit)
4711 KEG_ASSERT_COLD(keg);
4712 keg->uk_init = uminit;
4717 uma_zone_set_fini(uma_zone_t zone, uma_fini fini)
4722 KEG_ASSERT_COLD(keg);
4723 keg->uk_fini = fini;
4728 uma_zone_set_zinit(uma_zone_t zone, uma_init zinit)
4731 ZONE_ASSERT_COLD(zone);
4732 zone->uz_init = zinit;
4737 uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini)
4740 ZONE_ASSERT_COLD(zone);
4741 zone->uz_fini = zfini;
4746 uma_zone_set_freef(uma_zone_t zone, uma_free freef)
4751 KEG_ASSERT_COLD(keg);
4752 keg->uk_freef = freef;
4757 uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf)
4762 KEG_ASSERT_COLD(keg);
4763 keg->uk_allocf = allocf;
4768 uma_zone_set_smr(uma_zone_t zone, smr_t smr)
4771 ZONE_ASSERT_COLD(zone);
4773 KASSERT(smr != NULL, ("Got NULL smr"));
4774 KASSERT((zone->uz_flags & UMA_ZONE_SMR) == 0,
4775 ("zone %p (%s) already uses SMR", zone, zone->uz_name));
4776 zone->uz_flags |= UMA_ZONE_SMR;
4778 zone_update_caches(zone);
4782 uma_zone_get_smr(uma_zone_t zone)
4785 return (zone->uz_smr);
4790 uma_zone_reserve(uma_zone_t zone, int items)
4795 KEG_ASSERT_COLD(keg);
4796 keg->uk_reserve = items;
4801 uma_zone_reserve_kva(uma_zone_t zone, int count)
4808 KEG_ASSERT_COLD(keg);
4809 ZONE_ASSERT_COLD(zone);
4811 pages = howmany(count, keg->uk_ipers) * keg->uk_ppera;
4813 #ifdef UMA_MD_SMALL_ALLOC
4814 if (keg->uk_ppera > 1) {
4818 kva = kva_alloc((vm_size_t)pages * PAGE_SIZE);
4824 MPASS(keg->uk_kva == 0);
4827 zone->uz_max_items = pages * keg->uk_ipers;
4828 #ifdef UMA_MD_SMALL_ALLOC
4829 keg->uk_allocf = (keg->uk_ppera > 1) ? noobj_alloc : uma_small_alloc;
4831 keg->uk_allocf = noobj_alloc;
4833 keg->uk_flags |= UMA_ZFLAG_LIMIT | UMA_ZONE_NOFREE;
4834 zone->uz_flags |= UMA_ZFLAG_LIMIT | UMA_ZONE_NOFREE;
4835 zone_update_caches(zone);
4842 uma_prealloc(uma_zone_t zone, int items)
4844 struct vm_domainset_iter di;
4848 int aflags, domain, slabs;
4851 slabs = howmany(items, keg->uk_ipers);
4852 while (slabs-- > 0) {
4854 vm_domainset_iter_policy_ref_init(&di, &keg->uk_dr, &domain,
4857 slab = keg_alloc_slab(keg, zone, domain, M_WAITOK,
4860 dom = &keg->uk_domain[slab->us_domain];
4862 * keg_alloc_slab() always returns a slab on the
4865 LIST_REMOVE(slab, us_link);
4866 LIST_INSERT_HEAD(&dom->ud_free_slab, slab,
4868 dom->ud_free_slabs++;
4869 KEG_UNLOCK(keg, slab->us_domain);
4872 if (vm_domainset_iter_policy(&di, &domain) != 0)
4873 vm_wait_doms(&keg->uk_dr.dr_policy->ds_mask, 0);
4879 * Returns a snapshot of memory consumption in bytes.
4882 uma_zone_memory(uma_zone_t zone)
4888 if (zone->uz_flags & UMA_ZFLAG_CACHE) {
4889 for (i = 0; i < vm_ndomains; i++)
4890 sz += ZDOM_GET(zone, i)->uzd_nitems;
4891 return (sz * zone->uz_size);
4893 for (i = 0; i < vm_ndomains; i++)
4894 sz += zone->uz_keg->uk_domain[i].ud_pages;
4896 return (sz * PAGE_SIZE);
4901 uma_reclaim(int req)
4904 CTR0(KTR_UMA, "UMA: vm asked us to release pages!");
4905 sx_xlock(&uma_reclaim_lock);
4909 case UMA_RECLAIM_TRIM:
4910 zone_foreach(zone_trim, NULL);
4912 case UMA_RECLAIM_DRAIN:
4913 case UMA_RECLAIM_DRAIN_CPU:
4914 zone_foreach(zone_drain, NULL);
4915 if (req == UMA_RECLAIM_DRAIN_CPU) {
4916 pcpu_cache_drain_safe(NULL);
4917 zone_foreach(zone_drain, NULL);
4921 panic("unhandled reclamation request %d", req);
4925 * Some slabs may have been freed but this zone will be visited early
4926 * we visit again so that we can free pages that are empty once other
4927 * zones are drained. We have to do the same for buckets.
4929 zone_drain(slabzones[0], NULL);
4930 zone_drain(slabzones[1], NULL);
4931 bucket_zone_drain();
4932 sx_xunlock(&uma_reclaim_lock);
4935 static volatile int uma_reclaim_needed;
4938 uma_reclaim_wakeup(void)
4941 if (atomic_fetchadd_int(&uma_reclaim_needed, 1) == 0)
4942 wakeup(uma_reclaim);
4946 uma_reclaim_worker(void *arg __unused)
4950 sx_xlock(&uma_reclaim_lock);
4951 while (atomic_load_int(&uma_reclaim_needed) == 0)
4952 sx_sleep(uma_reclaim, &uma_reclaim_lock, PVM, "umarcl",
4954 sx_xunlock(&uma_reclaim_lock);
4955 EVENTHANDLER_INVOKE(vm_lowmem, VM_LOW_KMEM);
4956 uma_reclaim(UMA_RECLAIM_DRAIN_CPU);
4957 atomic_store_int(&uma_reclaim_needed, 0);
4958 /* Don't fire more than once per-second. */
4959 pause("umarclslp", hz);
4965 uma_zone_reclaim(uma_zone_t zone, int req)
4969 case UMA_RECLAIM_TRIM:
4970 zone_trim(zone, NULL);
4972 case UMA_RECLAIM_DRAIN:
4973 zone_drain(zone, NULL);
4975 case UMA_RECLAIM_DRAIN_CPU:
4976 pcpu_cache_drain_safe(zone);
4977 zone_drain(zone, NULL);
4980 panic("unhandled reclamation request %d", req);
4986 uma_zone_exhausted(uma_zone_t zone)
4989 return (atomic_load_32(&zone->uz_sleepers) > 0);
4996 return (uma_kmem_limit);
5000 uma_set_limit(unsigned long limit)
5003 uma_kmem_limit = limit;
5010 return (atomic_load_long(&uma_kmem_total));
5017 return (uma_kmem_limit - uma_size());
5022 * Generate statistics across both the zone and its per-cpu cache's. Return
5023 * desired statistics if the pointer is non-NULL for that statistic.
5025 * Note: does not update the zone statistics, as it can't safely clear the
5026 * per-CPU cache statistic.
5030 uma_zone_sumstat(uma_zone_t z, long *cachefreep, uint64_t *allocsp,
5031 uint64_t *freesp, uint64_t *sleepsp, uint64_t *xdomainp)
5034 uint64_t allocs, frees, sleeps, xdomain;
5037 allocs = frees = sleeps = xdomain = 0;
5040 cache = &z->uz_cpu[cpu];
5041 cachefree += cache->uc_allocbucket.ucb_cnt;
5042 cachefree += cache->uc_freebucket.ucb_cnt;
5043 xdomain += cache->uc_crossbucket.ucb_cnt;
5044 cachefree += cache->uc_crossbucket.ucb_cnt;
5045 allocs += cache->uc_allocs;
5046 frees += cache->uc_frees;
5048 allocs += counter_u64_fetch(z->uz_allocs);
5049 frees += counter_u64_fetch(z->uz_frees);
5050 xdomain += counter_u64_fetch(z->uz_xdomain);
5051 sleeps += z->uz_sleeps;
5052 if (cachefreep != NULL)
5053 *cachefreep = cachefree;
5054 if (allocsp != NULL)
5058 if (sleepsp != NULL)
5060 if (xdomainp != NULL)
5061 *xdomainp = xdomain;
5066 sysctl_vm_zone_count(SYSCTL_HANDLER_ARGS)
5073 rw_rlock(&uma_rwlock);
5074 LIST_FOREACH(kz, &uma_kegs, uk_link) {
5075 LIST_FOREACH(z, &kz->uk_zones, uz_link)
5078 LIST_FOREACH(z, &uma_cachezones, uz_link)
5081 rw_runlock(&uma_rwlock);
5082 return (sysctl_handle_int(oidp, &count, 0, req));
5086 uma_vm_zone_stats(struct uma_type_header *uth, uma_zone_t z, struct sbuf *sbuf,
5087 struct uma_percpu_stat *ups, bool internal)
5089 uma_zone_domain_t zdom;
5093 for (i = 0; i < vm_ndomains; i++) {
5094 zdom = ZDOM_GET(z, i);
5095 uth->uth_zone_free += zdom->uzd_nitems;
5097 uth->uth_allocs = counter_u64_fetch(z->uz_allocs);
5098 uth->uth_frees = counter_u64_fetch(z->uz_frees);
5099 uth->uth_fails = counter_u64_fetch(z->uz_fails);
5100 uth->uth_xdomain = counter_u64_fetch(z->uz_xdomain);
5101 uth->uth_sleeps = z->uz_sleeps;
5103 for (i = 0; i < mp_maxid + 1; i++) {
5104 bzero(&ups[i], sizeof(*ups));
5105 if (internal || CPU_ABSENT(i))
5107 cache = &z->uz_cpu[i];
5108 ups[i].ups_cache_free += cache->uc_allocbucket.ucb_cnt;
5109 ups[i].ups_cache_free += cache->uc_freebucket.ucb_cnt;
5110 ups[i].ups_cache_free += cache->uc_crossbucket.ucb_cnt;
5111 ups[i].ups_allocs = cache->uc_allocs;
5112 ups[i].ups_frees = cache->uc_frees;
5117 sysctl_vm_zone_stats(SYSCTL_HANDLER_ARGS)
5119 struct uma_stream_header ush;
5120 struct uma_type_header uth;
5121 struct uma_percpu_stat *ups;
5126 uint32_t kfree, pages;
5127 int count, error, i;
5129 error = sysctl_wire_old_buffer(req, 0);
5132 sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
5133 sbuf_clear_flags(&sbuf, SBUF_INCLUDENUL);
5134 ups = malloc((mp_maxid + 1) * sizeof(*ups), M_TEMP, M_WAITOK);
5137 rw_rlock(&uma_rwlock);
5138 LIST_FOREACH(kz, &uma_kegs, uk_link) {
5139 LIST_FOREACH(z, &kz->uk_zones, uz_link)
5143 LIST_FOREACH(z, &uma_cachezones, uz_link)
5147 * Insert stream header.
5149 bzero(&ush, sizeof(ush));
5150 ush.ush_version = UMA_STREAM_VERSION;
5151 ush.ush_maxcpus = (mp_maxid + 1);
5152 ush.ush_count = count;
5153 (void)sbuf_bcat(&sbuf, &ush, sizeof(ush));
5155 LIST_FOREACH(kz, &uma_kegs, uk_link) {
5157 for (i = 0; i < vm_ndomains; i++) {
5158 kfree += kz->uk_domain[i].ud_free_items;
5159 pages += kz->uk_domain[i].ud_pages;
5161 LIST_FOREACH(z, &kz->uk_zones, uz_link) {
5162 bzero(&uth, sizeof(uth));
5163 strlcpy(uth.uth_name, z->uz_name, UTH_MAX_NAME);
5164 uth.uth_align = kz->uk_align;
5165 uth.uth_size = kz->uk_size;
5166 uth.uth_rsize = kz->uk_rsize;
5167 if (z->uz_max_items > 0) {
5168 items = UZ_ITEMS_COUNT(z->uz_items);
5169 uth.uth_pages = (items / kz->uk_ipers) *
5172 uth.uth_pages = pages;
5173 uth.uth_maxpages = (z->uz_max_items / kz->uk_ipers) *
5175 uth.uth_limit = z->uz_max_items;
5176 uth.uth_keg_free = kfree;
5179 * A zone is secondary is it is not the first entry
5180 * on the keg's zone list.
5182 if ((z->uz_flags & UMA_ZONE_SECONDARY) &&
5183 (LIST_FIRST(&kz->uk_zones) != z))
5184 uth.uth_zone_flags = UTH_ZONE_SECONDARY;
5185 uma_vm_zone_stats(&uth, z, &sbuf, ups,
5186 kz->uk_flags & UMA_ZFLAG_INTERNAL);
5187 (void)sbuf_bcat(&sbuf, &uth, sizeof(uth));
5188 for (i = 0; i < mp_maxid + 1; i++)
5189 (void)sbuf_bcat(&sbuf, &ups[i], sizeof(ups[i]));
5192 LIST_FOREACH(z, &uma_cachezones, uz_link) {
5193 bzero(&uth, sizeof(uth));
5194 strlcpy(uth.uth_name, z->uz_name, UTH_MAX_NAME);
5195 uth.uth_size = z->uz_size;
5196 uma_vm_zone_stats(&uth, z, &sbuf, ups, false);
5197 (void)sbuf_bcat(&sbuf, &uth, sizeof(uth));
5198 for (i = 0; i < mp_maxid + 1; i++)
5199 (void)sbuf_bcat(&sbuf, &ups[i], sizeof(ups[i]));
5202 rw_runlock(&uma_rwlock);
5203 error = sbuf_finish(&sbuf);
5210 sysctl_handle_uma_zone_max(SYSCTL_HANDLER_ARGS)
5212 uma_zone_t zone = *(uma_zone_t *)arg1;
5215 max = uma_zone_get_max(zone);
5216 error = sysctl_handle_int(oidp, &max, 0, req);
5217 if (error || !req->newptr)
5220 uma_zone_set_max(zone, max);
5226 sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS)
5232 * Some callers want to add sysctls for global zones that
5233 * may not yet exist so they pass a pointer to a pointer.
5236 zone = *(uma_zone_t *)arg1;
5239 cur = uma_zone_get_cur(zone);
5240 return (sysctl_handle_int(oidp, &cur, 0, req));
5244 sysctl_handle_uma_zone_allocs(SYSCTL_HANDLER_ARGS)
5246 uma_zone_t zone = arg1;
5249 cur = uma_zone_get_allocs(zone);
5250 return (sysctl_handle_64(oidp, &cur, 0, req));
5254 sysctl_handle_uma_zone_frees(SYSCTL_HANDLER_ARGS)
5256 uma_zone_t zone = arg1;
5259 cur = uma_zone_get_frees(zone);
5260 return (sysctl_handle_64(oidp, &cur, 0, req));
5264 sysctl_handle_uma_zone_flags(SYSCTL_HANDLER_ARGS)
5267 uma_zone_t zone = arg1;
5270 sbuf_new_for_sysctl(&sbuf, NULL, 0, req);
5271 if (zone->uz_flags != 0)
5272 sbuf_printf(&sbuf, "0x%b", zone->uz_flags, PRINT_UMA_ZFLAGS);
5274 sbuf_printf(&sbuf, "0");
5275 error = sbuf_finish(&sbuf);
5282 sysctl_handle_uma_slab_efficiency(SYSCTL_HANDLER_ARGS)
5284 uma_keg_t keg = arg1;
5285 int avail, effpct, total;
5287 total = keg->uk_ppera * PAGE_SIZE;
5288 if ((keg->uk_flags & UMA_ZFLAG_OFFPAGE) != 0)
5289 total += slabzone(keg->uk_ipers)->uz_keg->uk_rsize;
5291 * We consider the client's requested size and alignment here, not the
5292 * real size determination uk_rsize, because we also adjust the real
5293 * size for internal implementation reasons (max bitset size).
5295 avail = keg->uk_ipers * roundup2(keg->uk_size, keg->uk_align + 1);
5296 if ((keg->uk_flags & UMA_ZONE_PCPU) != 0)
5297 avail *= mp_maxid + 1;
5298 effpct = 100 * avail / total;
5299 return (sysctl_handle_int(oidp, &effpct, 0, req));
5303 sysctl_handle_uma_zone_items(SYSCTL_HANDLER_ARGS)
5305 uma_zone_t zone = arg1;
5308 cur = UZ_ITEMS_COUNT(atomic_load_64(&zone->uz_items));
5309 return (sysctl_handle_64(oidp, &cur, 0, req));
5314 uma_dbg_getslab(uma_zone_t zone, void *item)
5321 * It is safe to return the slab here even though the
5322 * zone is unlocked because the item's allocation state
5323 * essentially holds a reference.
5325 mem = (uint8_t *)((uintptr_t)item & (~UMA_SLAB_MASK));
5326 if ((zone->uz_flags & UMA_ZFLAG_CACHE) != 0)
5328 if (zone->uz_flags & UMA_ZFLAG_VTOSLAB)
5329 return (vtoslab((vm_offset_t)mem));
5331 if ((keg->uk_flags & UMA_ZFLAG_HASH) == 0)
5332 return ((uma_slab_t)(mem + keg->uk_pgoff));
5334 slab = hash_sfind(&keg->uk_hash, mem);
5341 uma_dbg_zskip(uma_zone_t zone, void *mem)
5344 if ((zone->uz_flags & UMA_ZFLAG_CACHE) != 0)
5347 return (uma_dbg_kskip(zone->uz_keg, mem));
5351 uma_dbg_kskip(uma_keg_t keg, void *mem)
5355 if (dbg_divisor == 0)
5358 if (dbg_divisor == 1)
5361 idx = (uintptr_t)mem >> PAGE_SHIFT;
5362 if (keg->uk_ipers > 1) {
5363 idx *= keg->uk_ipers;
5364 idx += ((uintptr_t)mem & PAGE_MASK) / keg->uk_rsize;
5367 if ((idx / dbg_divisor) * dbg_divisor != idx) {
5368 counter_u64_add(uma_skip_cnt, 1);
5371 counter_u64_add(uma_dbg_cnt, 1);
5377 * Set up the slab's freei data such that uma_dbg_free can function.
5381 uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item)
5387 slab = uma_dbg_getslab(zone, item);
5389 panic("uma: item %p did not belong to zone %s",
5390 item, zone->uz_name);
5393 freei = slab_item_index(slab, keg, item);
5395 if (BIT_ISSET(keg->uk_ipers, freei, slab_dbg_bits(slab, keg)))
5396 panic("Duplicate alloc of %p from zone %p(%s) slab %p(%d)",
5397 item, zone, zone->uz_name, slab, freei);
5398 BIT_SET_ATOMIC(keg->uk_ipers, freei, slab_dbg_bits(slab, keg));
5402 * Verifies freed addresses. Checks for alignment, valid slab membership
5403 * and duplicate frees.
5407 uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item)
5413 slab = uma_dbg_getslab(zone, item);
5415 panic("uma: Freed item %p did not belong to zone %s",
5416 item, zone->uz_name);
5419 freei = slab_item_index(slab, keg, item);
5421 if (freei >= keg->uk_ipers)
5422 panic("Invalid free of %p from zone %p(%s) slab %p(%d)",
5423 item, zone, zone->uz_name, slab, freei);
5425 if (slab_item(slab, keg, freei) != item)
5426 panic("Unaligned free of %p from zone %p(%s) slab %p(%d)",
5427 item, zone, zone->uz_name, slab, freei);
5429 if (!BIT_ISSET(keg->uk_ipers, freei, slab_dbg_bits(slab, keg)))
5430 panic("Duplicate free of %p from zone %p(%s) slab %p(%d)",
5431 item, zone, zone->uz_name, slab, freei);
5433 BIT_CLR_ATOMIC(keg->uk_ipers, freei, slab_dbg_bits(slab, keg));
5435 #endif /* INVARIANTS */
5439 get_uma_stats(uma_keg_t kz, uma_zone_t z, uint64_t *allocs, uint64_t *used,
5440 uint64_t *sleeps, long *cachefree, uint64_t *xdomain)
5445 if (kz->uk_flags & UMA_ZFLAG_INTERNAL) {
5446 *allocs = counter_u64_fetch(z->uz_allocs);
5447 frees = counter_u64_fetch(z->uz_frees);
5448 *sleeps = z->uz_sleeps;
5452 uma_zone_sumstat(z, cachefree, allocs, &frees, sleeps,
5454 for (i = 0; i < vm_ndomains; i++) {
5455 *cachefree += ZDOM_GET(z, i)->uzd_nitems;
5456 if (!((z->uz_flags & UMA_ZONE_SECONDARY) &&
5457 (LIST_FIRST(&kz->uk_zones) != z)))
5458 *cachefree += kz->uk_domain[i].ud_free_items;
5460 *used = *allocs - frees;
5461 return (((int64_t)*used + *cachefree) * kz->uk_size);
5464 DB_SHOW_COMMAND(uma, db_show_uma)
5466 const char *fmt_hdr, *fmt_entry;
5469 uint64_t allocs, used, sleeps, xdomain;
5471 /* variables for sorting */
5473 uma_zone_t cur_zone, last_zone;
5474 int64_t cur_size, last_size, size;
5477 /* /i option produces machine-parseable CSV output */
5478 if (modif[0] == 'i') {
5479 fmt_hdr = "%s,%s,%s,%s,%s,%s,%s,%s,%s\n";
5480 fmt_entry = "\"%s\",%ju,%jd,%ld,%ju,%ju,%u,%jd,%ju\n";
5482 fmt_hdr = "%18s %6s %7s %7s %11s %7s %7s %10s %8s\n";
5483 fmt_entry = "%18s %6ju %7jd %7ld %11ju %7ju %7u %10jd %8ju\n";
5486 db_printf(fmt_hdr, "Zone", "Size", "Used", "Free", "Requests",
5487 "Sleeps", "Bucket", "Total Mem", "XFree");
5489 /* Sort the zones with largest size first. */
5491 last_size = INT64_MAX;
5496 LIST_FOREACH(kz, &uma_kegs, uk_link) {
5497 LIST_FOREACH(z, &kz->uk_zones, uz_link) {
5499 * In the case of size ties, print out zones
5500 * in the order they are encountered. That is,
5501 * when we encounter the most recently output
5502 * zone, we have already printed all preceding
5503 * ties, and we must print all following ties.
5505 if (z == last_zone) {
5509 size = get_uma_stats(kz, z, &allocs, &used,
5510 &sleeps, &cachefree, &xdomain);
5511 if (size > cur_size && size < last_size + ties)
5519 if (cur_zone == NULL)
5522 size = get_uma_stats(cur_keg, cur_zone, &allocs, &used,
5523 &sleeps, &cachefree, &xdomain);
5524 db_printf(fmt_entry, cur_zone->uz_name,
5525 (uintmax_t)cur_keg->uk_size, (intmax_t)used, cachefree,
5526 (uintmax_t)allocs, (uintmax_t)sleeps,
5527 (unsigned)cur_zone->uz_bucket_size, (intmax_t)size,
5532 last_zone = cur_zone;
5533 last_size = cur_size;
5537 DB_SHOW_COMMAND(umacache, db_show_umacache)
5540 uint64_t allocs, frees;
5544 db_printf("%18s %8s %8s %8s %12s %8s\n", "Zone", "Size", "Used", "Free",
5545 "Requests", "Bucket");
5546 LIST_FOREACH(z, &uma_cachezones, uz_link) {
5547 uma_zone_sumstat(z, &cachefree, &allocs, &frees, NULL, NULL);
5548 for (i = 0; i < vm_ndomains; i++)
5549 cachefree += ZDOM_GET(z, i)->uzd_nitems;
5550 db_printf("%18s %8ju %8jd %8ld %12ju %8u\n",
5551 z->uz_name, (uintmax_t)z->uz_size,
5552 (intmax_t)(allocs - frees), cachefree,
5553 (uintmax_t)allocs, z->uz_bucket_size);