These calls are not the same in general: the former will dequeue the page if it is enqueued, while the latter will just leave it alone. But, all existing uses of the former apply to unmanaged pages, which are never enqueued in the first place. No functional change intended. Reviewed by: kib MFC after: 1 week Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20470
4233 lines
104 KiB
C
4233 lines
104 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2002-2005, 2009, 2013 Jeffrey Roberson <jeff@FreeBSD.org>
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* Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
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* Copyright (c) 2004-2006 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* uma_core.c Implementation of the Universal Memory allocator
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*
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* This allocator is intended to replace the multitude of similar object caches
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* in the standard FreeBSD kernel. The intent is to be flexible as well as
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* efficient. A primary design goal is to return unused memory to the rest of
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* the system. This will make the system as a whole more flexible due to the
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* ability to move memory to subsystems which most need it instead of leaving
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* pools of reserved memory unused.
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*
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* The basic ideas stem from similar slab/zone based allocators whose algorithms
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* are well known.
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*
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*/
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/*
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* TODO:
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* - Improve memory usage for large allocations
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* - Investigate cache size adjustments
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_param.h"
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bitset.h>
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#include <sys/domainset.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/types.h>
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#include <sys/limits.h>
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#include <sys/queue.h>
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#include <sys/malloc.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/sysctl.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/random.h>
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#include <sys/rwlock.h>
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#include <sys/sbuf.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/taskqueue.h>
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#include <sys/vmmeter.h>
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#include <vm/vm.h>
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#include <vm/vm_domainset.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_param.h>
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#include <vm/vm_phys.h>
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#include <vm/vm_pagequeue.h>
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#include <vm/vm_map.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <vm/uma_dbg.h>
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#include <ddb/ddb.h>
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#ifdef DEBUG_MEMGUARD
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#include <vm/memguard.h>
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#endif
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/*
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* This is the zone and keg from which all zones are spawned.
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*/
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static uma_zone_t kegs;
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static uma_zone_t zones;
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/* This is the zone from which all offpage uma_slab_ts are allocated. */
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static uma_zone_t slabzone;
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/*
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* The initial hash tables come out of this zone so they can be allocated
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* prior to malloc coming up.
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*/
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static uma_zone_t hashzone;
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/* The boot-time adjusted value for cache line alignment. */
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int uma_align_cache = 64 - 1;
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static MALLOC_DEFINE(M_UMAHASH, "UMAHash", "UMA Hash Buckets");
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/*
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* Are we allowed to allocate buckets?
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*/
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static int bucketdisable = 1;
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/* Linked list of all kegs in the system */
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static LIST_HEAD(,uma_keg) uma_kegs = LIST_HEAD_INITIALIZER(uma_kegs);
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/* Linked list of all cache-only zones in the system */
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static LIST_HEAD(,uma_zone) uma_cachezones =
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LIST_HEAD_INITIALIZER(uma_cachezones);
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/* This RW lock protects the keg list */
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static struct rwlock_padalign __exclusive_cache_line uma_rwlock;
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/*
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* Pointer and counter to pool of pages, that is preallocated at
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* startup to bootstrap UMA.
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*/
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static char *bootmem;
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static int boot_pages;
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static struct sx uma_drain_lock;
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/*
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* kmem soft limit, initialized by uma_set_limit(). Ensure that early
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* allocations don't trigger a wakeup of the reclaim thread.
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*/
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static unsigned long uma_kmem_limit = LONG_MAX;
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SYSCTL_ULONG(_vm, OID_AUTO, uma_kmem_limit, CTLFLAG_RD, &uma_kmem_limit, 0,
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"UMA kernel memory soft limit");
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static unsigned long uma_kmem_total;
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SYSCTL_ULONG(_vm, OID_AUTO, uma_kmem_total, CTLFLAG_RD, &uma_kmem_total, 0,
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"UMA kernel memory usage");
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/* Is the VM done starting up? */
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static enum { BOOT_COLD = 0, BOOT_STRAPPED, BOOT_PAGEALLOC, BOOT_BUCKETS,
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BOOT_RUNNING } booted = BOOT_COLD;
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/*
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* This is the handle used to schedule events that need to happen
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* outside of the allocation fast path.
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*/
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static struct callout uma_callout;
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#define UMA_TIMEOUT 20 /* Seconds for callout interval. */
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/*
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* This structure is passed as the zone ctor arg so that I don't have to create
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* a special allocation function just for zones.
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*/
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struct uma_zctor_args {
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const char *name;
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size_t size;
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uma_ctor ctor;
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uma_dtor dtor;
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uma_init uminit;
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uma_fini fini;
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uma_import import;
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uma_release release;
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void *arg;
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uma_keg_t keg;
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int align;
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uint32_t flags;
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};
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struct uma_kctor_args {
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uma_zone_t zone;
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size_t size;
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uma_init uminit;
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uma_fini fini;
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int align;
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uint32_t flags;
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};
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struct uma_bucket_zone {
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uma_zone_t ubz_zone;
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char *ubz_name;
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int ubz_entries; /* Number of items it can hold. */
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int ubz_maxsize; /* Maximum allocation size per-item. */
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};
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/*
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* Compute the actual number of bucket entries to pack them in power
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* of two sizes for more efficient space utilization.
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*/
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#define BUCKET_SIZE(n) \
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(((sizeof(void *) * (n)) - sizeof(struct uma_bucket)) / sizeof(void *))
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#define BUCKET_MAX BUCKET_SIZE(256)
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struct uma_bucket_zone bucket_zones[] = {
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{ NULL, "4 Bucket", BUCKET_SIZE(4), 4096 },
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{ NULL, "6 Bucket", BUCKET_SIZE(6), 3072 },
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{ NULL, "8 Bucket", BUCKET_SIZE(8), 2048 },
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{ NULL, "12 Bucket", BUCKET_SIZE(12), 1536 },
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{ NULL, "16 Bucket", BUCKET_SIZE(16), 1024 },
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{ NULL, "32 Bucket", BUCKET_SIZE(32), 512 },
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{ NULL, "64 Bucket", BUCKET_SIZE(64), 256 },
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{ NULL, "128 Bucket", BUCKET_SIZE(128), 128 },
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{ NULL, "256 Bucket", BUCKET_SIZE(256), 64 },
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{ NULL, NULL, 0}
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};
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/*
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* Flags and enumerations to be passed to internal functions.
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*/
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enum zfreeskip {
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SKIP_NONE = 0,
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SKIP_CNT = 0x00000001,
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SKIP_DTOR = 0x00010000,
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SKIP_FINI = 0x00020000,
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};
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#define UMA_ANYDOMAIN -1 /* Special value for domain search. */
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/* Prototypes.. */
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int uma_startup_count(int);
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void uma_startup(void *, int);
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void uma_startup1(void);
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void uma_startup2(void);
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static void *noobj_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
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static void *page_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
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static void *pcpu_page_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
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static void *startup_alloc(uma_zone_t, vm_size_t, int, uint8_t *, int);
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static void page_free(void *, vm_size_t, uint8_t);
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static void pcpu_page_free(void *, vm_size_t, uint8_t);
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static uma_slab_t keg_alloc_slab(uma_keg_t, uma_zone_t, int, int, int);
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static void cache_drain(uma_zone_t);
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static void bucket_drain(uma_zone_t, uma_bucket_t);
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static void bucket_cache_drain(uma_zone_t zone);
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static int keg_ctor(void *, int, void *, int);
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static void keg_dtor(void *, int, void *);
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static int zone_ctor(void *, int, void *, int);
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static void zone_dtor(void *, int, void *);
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static int zero_init(void *, int, int);
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static void keg_small_init(uma_keg_t keg);
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static void keg_large_init(uma_keg_t keg);
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static void zone_foreach(void (*zfunc)(uma_zone_t));
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static void zone_timeout(uma_zone_t zone);
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static int hash_alloc(struct uma_hash *, u_int);
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static int hash_expand(struct uma_hash *, struct uma_hash *);
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static void hash_free(struct uma_hash *hash);
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static void uma_timeout(void *);
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static void uma_startup3(void);
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static void *zone_alloc_item(uma_zone_t, void *, int, int);
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static void *zone_alloc_item_locked(uma_zone_t, void *, int, int);
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static void zone_free_item(uma_zone_t, void *, void *, enum zfreeskip);
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static void bucket_enable(void);
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static void bucket_init(void);
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static uma_bucket_t bucket_alloc(uma_zone_t zone, void *, int);
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static void bucket_free(uma_zone_t zone, uma_bucket_t, void *);
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static void bucket_zone_drain(void);
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static uma_bucket_t zone_alloc_bucket(uma_zone_t, void *, int, int, int);
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static uma_slab_t zone_fetch_slab(uma_zone_t, uma_keg_t, int, int);
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static void *slab_alloc_item(uma_keg_t keg, uma_slab_t slab);
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static void slab_free_item(uma_zone_t zone, uma_slab_t slab, void *item);
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static uma_keg_t uma_kcreate(uma_zone_t zone, size_t size, uma_init uminit,
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uma_fini fini, int align, uint32_t flags);
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static int zone_import(uma_zone_t, void **, int, int, int);
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static void zone_release(uma_zone_t, void **, int);
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static void uma_zero_item(void *, uma_zone_t);
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void uma_print_zone(uma_zone_t);
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void uma_print_stats(void);
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static int sysctl_vm_zone_count(SYSCTL_HANDLER_ARGS);
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static int sysctl_vm_zone_stats(SYSCTL_HANDLER_ARGS);
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#ifdef INVARIANTS
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static bool uma_dbg_kskip(uma_keg_t keg, void *mem);
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static bool uma_dbg_zskip(uma_zone_t zone, void *mem);
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static void uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item);
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static void uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item);
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static SYSCTL_NODE(_vm, OID_AUTO, debug, CTLFLAG_RD, 0,
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"Memory allocation debugging");
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static u_int dbg_divisor = 1;
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SYSCTL_UINT(_vm_debug, OID_AUTO, divisor,
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CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &dbg_divisor, 0,
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"Debug & thrash every this item in memory allocator");
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static counter_u64_t uma_dbg_cnt = EARLY_COUNTER;
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static counter_u64_t uma_skip_cnt = EARLY_COUNTER;
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SYSCTL_COUNTER_U64(_vm_debug, OID_AUTO, trashed, CTLFLAG_RD,
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&uma_dbg_cnt, "memory items debugged");
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SYSCTL_COUNTER_U64(_vm_debug, OID_AUTO, skipped, CTLFLAG_RD,
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&uma_skip_cnt, "memory items skipped, not debugged");
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#endif
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SYSINIT(uma_startup3, SI_SUB_VM_CONF, SI_ORDER_SECOND, uma_startup3, NULL);
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SYSCTL_PROC(_vm, OID_AUTO, zone_count, CTLFLAG_RD|CTLTYPE_INT,
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0, 0, sysctl_vm_zone_count, "I", "Number of UMA zones");
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SYSCTL_PROC(_vm, OID_AUTO, zone_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
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0, 0, sysctl_vm_zone_stats, "s,struct uma_type_header", "Zone Stats");
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|
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static int zone_warnings = 1;
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SYSCTL_INT(_vm, OID_AUTO, zone_warnings, CTLFLAG_RWTUN, &zone_warnings, 0,
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"Warn when UMA zones becomes full");
|
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|
|
/* Adjust bytes under management by UMA. */
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static inline void
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uma_total_dec(unsigned long size)
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{
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|
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atomic_subtract_long(&uma_kmem_total, size);
|
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}
|
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|
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static inline void
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uma_total_inc(unsigned long size)
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{
|
|
|
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if (atomic_fetchadd_long(&uma_kmem_total, size) > uma_kmem_limit)
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uma_reclaim_wakeup();
|
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}
|
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|
|
/*
|
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* This routine checks to see whether or not it's safe to enable buckets.
|
|
*/
|
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static void
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bucket_enable(void)
|
|
{
|
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bucketdisable = vm_page_count_min();
|
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}
|
|
|
|
/*
|
|
* Initialize bucket_zones, the array of zones of buckets of various sizes.
|
|
*
|
|
* For each zone, calculate the memory required for each bucket, consisting
|
|
* of the header and an array of pointers.
|
|
*/
|
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static void
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bucket_init(void)
|
|
{
|
|
struct uma_bucket_zone *ubz;
|
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int size;
|
|
|
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for (ubz = &bucket_zones[0]; ubz->ubz_entries != 0; ubz++) {
|
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size = roundup(sizeof(struct uma_bucket), sizeof(void *));
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size += sizeof(void *) * ubz->ubz_entries;
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ubz->ubz_zone = uma_zcreate(ubz->ubz_name, size,
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NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
|
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UMA_ZONE_MTXCLASS | UMA_ZFLAG_BUCKET | UMA_ZONE_NUMA);
|
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}
|
|
}
|
|
|
|
/*
|
|
* Given a desired number of entries for a bucket, return the zone from which
|
|
* to allocate the bucket.
|
|
*/
|
|
static struct uma_bucket_zone *
|
|
bucket_zone_lookup(int entries)
|
|
{
|
|
struct uma_bucket_zone *ubz;
|
|
|
|
for (ubz = &bucket_zones[0]; ubz->ubz_entries != 0; ubz++)
|
|
if (ubz->ubz_entries >= entries)
|
|
return (ubz);
|
|
ubz--;
|
|
return (ubz);
|
|
}
|
|
|
|
static int
|
|
bucket_select(int size)
|
|
{
|
|
struct uma_bucket_zone *ubz;
|
|
|
|
ubz = &bucket_zones[0];
|
|
if (size > ubz->ubz_maxsize)
|
|
return MAX((ubz->ubz_maxsize * ubz->ubz_entries) / size, 1);
|
|
|
|
for (; ubz->ubz_entries != 0; ubz++)
|
|
if (ubz->ubz_maxsize < size)
|
|
break;
|
|
ubz--;
|
|
return (ubz->ubz_entries);
|
|
}
|
|
|
|
static uma_bucket_t
|
|
bucket_alloc(uma_zone_t zone, void *udata, int flags)
|
|
{
|
|
struct uma_bucket_zone *ubz;
|
|
uma_bucket_t bucket;
|
|
|
|
/*
|
|
* This is to stop us from allocating per cpu buckets while we're
|
|
* running out of vm.boot_pages. Otherwise, we would exhaust the
|
|
* boot pages. This also prevents us from allocating buckets in
|
|
* low memory situations.
|
|
*/
|
|
if (bucketdisable)
|
|
return (NULL);
|
|
/*
|
|
* To limit bucket recursion we store the original zone flags
|
|
* in a cookie passed via zalloc_arg/zfree_arg. This allows the
|
|
* NOVM flag to persist even through deep recursions. We also
|
|
* store ZFLAG_BUCKET once we have recursed attempting to allocate
|
|
* a bucket for a bucket zone so we do not allow infinite bucket
|
|
* recursion. This cookie will even persist to frees of unused
|
|
* buckets via the allocation path or bucket allocations in the
|
|
* free path.
|
|
*/
|
|
if ((zone->uz_flags & UMA_ZFLAG_BUCKET) == 0)
|
|
udata = (void *)(uintptr_t)zone->uz_flags;
|
|
else {
|
|
if ((uintptr_t)udata & UMA_ZFLAG_BUCKET)
|
|
return (NULL);
|
|
udata = (void *)((uintptr_t)udata | UMA_ZFLAG_BUCKET);
|
|
}
|
|
if ((uintptr_t)udata & UMA_ZFLAG_CACHEONLY)
|
|
flags |= M_NOVM;
|
|
ubz = bucket_zone_lookup(zone->uz_count);
|
|
if (ubz->ubz_zone == zone && (ubz + 1)->ubz_entries != 0)
|
|
ubz++;
|
|
bucket = uma_zalloc_arg(ubz->ubz_zone, udata, flags);
|
|
if (bucket) {
|
|
#ifdef INVARIANTS
|
|
bzero(bucket->ub_bucket, sizeof(void *) * ubz->ubz_entries);
|
|
#endif
|
|
bucket->ub_cnt = 0;
|
|
bucket->ub_entries = ubz->ubz_entries;
|
|
}
|
|
|
|
return (bucket);
|
|
}
|
|
|
|
static void
|
|
bucket_free(uma_zone_t zone, uma_bucket_t bucket, void *udata)
|
|
{
|
|
struct uma_bucket_zone *ubz;
|
|
|
|
KASSERT(bucket->ub_cnt == 0,
|
|
("bucket_free: Freeing a non free bucket."));
|
|
if ((zone->uz_flags & UMA_ZFLAG_BUCKET) == 0)
|
|
udata = (void *)(uintptr_t)zone->uz_flags;
|
|
ubz = bucket_zone_lookup(bucket->ub_entries);
|
|
uma_zfree_arg(ubz->ubz_zone, bucket, udata);
|
|
}
|
|
|
|
static void
|
|
bucket_zone_drain(void)
|
|
{
|
|
struct uma_bucket_zone *ubz;
|
|
|
|
for (ubz = &bucket_zones[0]; ubz->ubz_entries != 0; ubz++)
|
|
zone_drain(ubz->ubz_zone);
|
|
}
|
|
|
|
static uma_bucket_t
|
|
zone_try_fetch_bucket(uma_zone_t zone, uma_zone_domain_t zdom, const bool ws)
|
|
{
|
|
uma_bucket_t bucket;
|
|
|
|
ZONE_LOCK_ASSERT(zone);
|
|
|
|
if ((bucket = LIST_FIRST(&zdom->uzd_buckets)) != NULL) {
|
|
MPASS(zdom->uzd_nitems >= bucket->ub_cnt);
|
|
LIST_REMOVE(bucket, ub_link);
|
|
zdom->uzd_nitems -= bucket->ub_cnt;
|
|
if (ws && zdom->uzd_imin > zdom->uzd_nitems)
|
|
zdom->uzd_imin = zdom->uzd_nitems;
|
|
zone->uz_bkt_count -= bucket->ub_cnt;
|
|
}
|
|
return (bucket);
|
|
}
|
|
|
|
static void
|
|
zone_put_bucket(uma_zone_t zone, uma_zone_domain_t zdom, uma_bucket_t bucket,
|
|
const bool ws)
|
|
{
|
|
|
|
ZONE_LOCK_ASSERT(zone);
|
|
KASSERT(zone->uz_bkt_count < zone->uz_bkt_max, ("%s: zone %p overflow",
|
|
__func__, zone));
|
|
|
|
LIST_INSERT_HEAD(&zdom->uzd_buckets, bucket, ub_link);
|
|
zdom->uzd_nitems += bucket->ub_cnt;
|
|
if (ws && zdom->uzd_imax < zdom->uzd_nitems)
|
|
zdom->uzd_imax = zdom->uzd_nitems;
|
|
zone->uz_bkt_count += bucket->ub_cnt;
|
|
}
|
|
|
|
static void
|
|
zone_log_warning(uma_zone_t zone)
|
|
{
|
|
static const struct timeval warninterval = { 300, 0 };
|
|
|
|
if (!zone_warnings || zone->uz_warning == NULL)
|
|
return;
|
|
|
|
if (ratecheck(&zone->uz_ratecheck, &warninterval))
|
|
printf("[zone: %s] %s\n", zone->uz_name, zone->uz_warning);
|
|
}
|
|
|
|
static inline void
|
|
zone_maxaction(uma_zone_t zone)
|
|
{
|
|
|
|
if (zone->uz_maxaction.ta_func != NULL)
|
|
taskqueue_enqueue(taskqueue_thread, &zone->uz_maxaction);
|
|
}
|
|
|
|
/*
|
|
* Routine called by timeout which is used to fire off some time interval
|
|
* based calculations. (stats, hash size, etc.)
|
|
*
|
|
* Arguments:
|
|
* arg Unused
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
static void
|
|
uma_timeout(void *unused)
|
|
{
|
|
bucket_enable();
|
|
zone_foreach(zone_timeout);
|
|
|
|
/* Reschedule this event */
|
|
callout_reset(&uma_callout, UMA_TIMEOUT * hz, uma_timeout, NULL);
|
|
}
|
|
|
|
/*
|
|
* Update the working set size estimate for the zone's bucket cache.
|
|
* The constants chosen here are somewhat arbitrary. With an update period of
|
|
* 20s (UMA_TIMEOUT), this estimate is dominated by zone activity over the
|
|
* last 100s.
|
|
*/
|
|
static void
|
|
zone_domain_update_wss(uma_zone_domain_t zdom)
|
|
{
|
|
long wss;
|
|
|
|
MPASS(zdom->uzd_imax >= zdom->uzd_imin);
|
|
wss = zdom->uzd_imax - zdom->uzd_imin;
|
|
zdom->uzd_imax = zdom->uzd_imin = zdom->uzd_nitems;
|
|
zdom->uzd_wss = (3 * wss + 2 * zdom->uzd_wss) / 5;
|
|
}
|
|
|
|
/*
|
|
* Routine to perform timeout driven calculations. This expands the
|
|
* hashes and does per cpu statistics aggregation.
|
|
*
|
|
* Returns nothing.
|
|
*/
|
|
static void
|
|
zone_timeout(uma_zone_t zone)
|
|
{
|
|
uma_keg_t keg = zone->uz_keg;
|
|
u_int slabs;
|
|
|
|
KEG_LOCK(keg);
|
|
/*
|
|
* Expand the keg hash table.
|
|
*
|
|
* This is done if the number of slabs is larger than the hash size.
|
|
* What I'm trying to do here is completely reduce collisions. This
|
|
* may be a little aggressive. Should I allow for two collisions max?
|
|
*/
|
|
if (keg->uk_flags & UMA_ZONE_HASH &&
|
|
(slabs = keg->uk_pages / keg->uk_ppera) >
|
|
keg->uk_hash.uh_hashsize) {
|
|
struct uma_hash newhash;
|
|
struct uma_hash oldhash;
|
|
int ret;
|
|
|
|
/*
|
|
* This is so involved because allocating and freeing
|
|
* while the keg lock is held will lead to deadlock.
|
|
* I have to do everything in stages and check for
|
|
* races.
|
|
*/
|
|
KEG_UNLOCK(keg);
|
|
ret = hash_alloc(&newhash, 1 << fls(slabs));
|
|
KEG_LOCK(keg);
|
|
if (ret) {
|
|
if (hash_expand(&keg->uk_hash, &newhash)) {
|
|
oldhash = keg->uk_hash;
|
|
keg->uk_hash = newhash;
|
|
} else
|
|
oldhash = newhash;
|
|
|
|
KEG_UNLOCK(keg);
|
|
hash_free(&oldhash);
|
|
return;
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < vm_ndomains; i++)
|
|
zone_domain_update_wss(&zone->uz_domain[i]);
|
|
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/*
|
|
* Allocate and zero fill the next sized hash table from the appropriate
|
|
* backing store.
|
|
*
|
|
* Arguments:
|
|
* hash A new hash structure with the old hash size in uh_hashsize
|
|
*
|
|
* Returns:
|
|
* 1 on success and 0 on failure.
|
|
*/
|
|
static int
|
|
hash_alloc(struct uma_hash *hash, u_int size)
|
|
{
|
|
size_t alloc;
|
|
|
|
KASSERT(powerof2(size), ("hash size must be power of 2"));
|
|
if (size > UMA_HASH_SIZE_INIT) {
|
|
hash->uh_hashsize = size;
|
|
alloc = sizeof(hash->uh_slab_hash[0]) * hash->uh_hashsize;
|
|
hash->uh_slab_hash = (struct slabhead *)malloc(alloc,
|
|
M_UMAHASH, M_NOWAIT);
|
|
} else {
|
|
alloc = sizeof(hash->uh_slab_hash[0]) * UMA_HASH_SIZE_INIT;
|
|
hash->uh_slab_hash = zone_alloc_item(hashzone, NULL,
|
|
UMA_ANYDOMAIN, M_WAITOK);
|
|
hash->uh_hashsize = UMA_HASH_SIZE_INIT;
|
|
}
|
|
if (hash->uh_slab_hash) {
|
|
bzero(hash->uh_slab_hash, alloc);
|
|
hash->uh_hashmask = hash->uh_hashsize - 1;
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Expands the hash table for HASH zones. This is done from zone_timeout
|
|
* to reduce collisions. This must not be done in the regular allocation
|
|
* path, otherwise, we can recurse on the vm while allocating pages.
|
|
*
|
|
* Arguments:
|
|
* oldhash The hash you want to expand
|
|
* newhash The hash structure for the new table
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*
|
|
* Discussion:
|
|
*/
|
|
static int
|
|
hash_expand(struct uma_hash *oldhash, struct uma_hash *newhash)
|
|
{
|
|
uma_slab_t slab;
|
|
u_int hval;
|
|
u_int idx;
|
|
|
|
if (!newhash->uh_slab_hash)
|
|
return (0);
|
|
|
|
if (oldhash->uh_hashsize >= newhash->uh_hashsize)
|
|
return (0);
|
|
|
|
/*
|
|
* I need to investigate hash algorithms for resizing without a
|
|
* full rehash.
|
|
*/
|
|
|
|
for (idx = 0; idx < oldhash->uh_hashsize; idx++)
|
|
while (!SLIST_EMPTY(&oldhash->uh_slab_hash[idx])) {
|
|
slab = SLIST_FIRST(&oldhash->uh_slab_hash[idx]);
|
|
SLIST_REMOVE_HEAD(&oldhash->uh_slab_hash[idx], us_hlink);
|
|
hval = UMA_HASH(newhash, slab->us_data);
|
|
SLIST_INSERT_HEAD(&newhash->uh_slab_hash[hval],
|
|
slab, us_hlink);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Free the hash bucket to the appropriate backing store.
|
|
*
|
|
* Arguments:
|
|
* slab_hash The hash bucket we're freeing
|
|
* hashsize The number of entries in that hash bucket
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
static void
|
|
hash_free(struct uma_hash *hash)
|
|
{
|
|
if (hash->uh_slab_hash == NULL)
|
|
return;
|
|
if (hash->uh_hashsize == UMA_HASH_SIZE_INIT)
|
|
zone_free_item(hashzone, hash->uh_slab_hash, NULL, SKIP_NONE);
|
|
else
|
|
free(hash->uh_slab_hash, M_UMAHASH);
|
|
}
|
|
|
|
/*
|
|
* Frees all outstanding items in a bucket
|
|
*
|
|
* Arguments:
|
|
* zone The zone to free to, must be unlocked.
|
|
* bucket The free/alloc bucket with items, cpu queue must be locked.
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
|
|
static void
|
|
bucket_drain(uma_zone_t zone, uma_bucket_t bucket)
|
|
{
|
|
int i;
|
|
|
|
if (bucket == NULL)
|
|
return;
|
|
|
|
if (zone->uz_fini)
|
|
for (i = 0; i < bucket->ub_cnt; i++)
|
|
zone->uz_fini(bucket->ub_bucket[i], zone->uz_size);
|
|
zone->uz_release(zone->uz_arg, bucket->ub_bucket, bucket->ub_cnt);
|
|
if (zone->uz_max_items > 0) {
|
|
ZONE_LOCK(zone);
|
|
zone->uz_items -= bucket->ub_cnt;
|
|
if (zone->uz_sleepers && zone->uz_items < zone->uz_max_items)
|
|
wakeup_one(zone);
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
bucket->ub_cnt = 0;
|
|
}
|
|
|
|
/*
|
|
* Drains the per cpu caches for a zone.
|
|
*
|
|
* NOTE: This may only be called while the zone is being turn down, and not
|
|
* during normal operation. This is necessary in order that we do not have
|
|
* to migrate CPUs to drain the per-CPU caches.
|
|
*
|
|
* Arguments:
|
|
* zone The zone to drain, must be unlocked.
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
static void
|
|
cache_drain(uma_zone_t zone)
|
|
{
|
|
uma_cache_t cache;
|
|
int cpu;
|
|
|
|
/*
|
|
* XXX: It is safe to not lock the per-CPU caches, because we're
|
|
* tearing down the zone anyway. I.e., there will be no further use
|
|
* of the caches at this point.
|
|
*
|
|
* XXX: It would good to be able to assert that the zone is being
|
|
* torn down to prevent improper use of cache_drain().
|
|
*
|
|
* XXX: We lock the zone before passing into bucket_cache_drain() as
|
|
* it is used elsewhere. Should the tear-down path be made special
|
|
* there in some form?
|
|
*/
|
|
CPU_FOREACH(cpu) {
|
|
cache = &zone->uz_cpu[cpu];
|
|
bucket_drain(zone, cache->uc_allocbucket);
|
|
bucket_drain(zone, cache->uc_freebucket);
|
|
if (cache->uc_allocbucket != NULL)
|
|
bucket_free(zone, cache->uc_allocbucket, NULL);
|
|
if (cache->uc_freebucket != NULL)
|
|
bucket_free(zone, cache->uc_freebucket, NULL);
|
|
cache->uc_allocbucket = cache->uc_freebucket = NULL;
|
|
}
|
|
ZONE_LOCK(zone);
|
|
bucket_cache_drain(zone);
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
static void
|
|
cache_shrink(uma_zone_t zone)
|
|
{
|
|
|
|
if (zone->uz_flags & UMA_ZFLAG_INTERNAL)
|
|
return;
|
|
|
|
ZONE_LOCK(zone);
|
|
zone->uz_count = (zone->uz_count_min + zone->uz_count) / 2;
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
static void
|
|
cache_drain_safe_cpu(uma_zone_t zone)
|
|
{
|
|
uma_cache_t cache;
|
|
uma_bucket_t b1, b2;
|
|
int domain;
|
|
|
|
if (zone->uz_flags & UMA_ZFLAG_INTERNAL)
|
|
return;
|
|
|
|
b1 = b2 = NULL;
|
|
ZONE_LOCK(zone);
|
|
critical_enter();
|
|
if (zone->uz_flags & UMA_ZONE_NUMA)
|
|
domain = PCPU_GET(domain);
|
|
else
|
|
domain = 0;
|
|
cache = &zone->uz_cpu[curcpu];
|
|
if (cache->uc_allocbucket) {
|
|
if (cache->uc_allocbucket->ub_cnt != 0)
|
|
zone_put_bucket(zone, &zone->uz_domain[domain],
|
|
cache->uc_allocbucket, false);
|
|
else
|
|
b1 = cache->uc_allocbucket;
|
|
cache->uc_allocbucket = NULL;
|
|
}
|
|
if (cache->uc_freebucket) {
|
|
if (cache->uc_freebucket->ub_cnt != 0)
|
|
zone_put_bucket(zone, &zone->uz_domain[domain],
|
|
cache->uc_freebucket, false);
|
|
else
|
|
b2 = cache->uc_freebucket;
|
|
cache->uc_freebucket = NULL;
|
|
}
|
|
critical_exit();
|
|
ZONE_UNLOCK(zone);
|
|
if (b1)
|
|
bucket_free(zone, b1, NULL);
|
|
if (b2)
|
|
bucket_free(zone, b2, NULL);
|
|
}
|
|
|
|
/*
|
|
* Safely drain per-CPU caches of a zone(s) to alloc bucket.
|
|
* This is an expensive call because it needs to bind to all CPUs
|
|
* one by one and enter a critical section on each of them in order
|
|
* to safely access their cache buckets.
|
|
* Zone lock must not be held on call this function.
|
|
*/
|
|
static void
|
|
cache_drain_safe(uma_zone_t zone)
|
|
{
|
|
int cpu;
|
|
|
|
/*
|
|
* Polite bucket sizes shrinking was not enouth, shrink aggressively.
|
|
*/
|
|
if (zone)
|
|
cache_shrink(zone);
|
|
else
|
|
zone_foreach(cache_shrink);
|
|
|
|
CPU_FOREACH(cpu) {
|
|
thread_lock(curthread);
|
|
sched_bind(curthread, cpu);
|
|
thread_unlock(curthread);
|
|
|
|
if (zone)
|
|
cache_drain_safe_cpu(zone);
|
|
else
|
|
zone_foreach(cache_drain_safe_cpu);
|
|
}
|
|
thread_lock(curthread);
|
|
sched_unbind(curthread);
|
|
thread_unlock(curthread);
|
|
}
|
|
|
|
/*
|
|
* Drain the cached buckets from a zone. Expects a locked zone on entry.
|
|
*/
|
|
static void
|
|
bucket_cache_drain(uma_zone_t zone)
|
|
{
|
|
uma_zone_domain_t zdom;
|
|
uma_bucket_t bucket;
|
|
int i;
|
|
|
|
/*
|
|
* Drain the bucket queues and free the buckets.
|
|
*/
|
|
for (i = 0; i < vm_ndomains; i++) {
|
|
zdom = &zone->uz_domain[i];
|
|
while ((bucket = zone_try_fetch_bucket(zone, zdom, false)) !=
|
|
NULL) {
|
|
ZONE_UNLOCK(zone);
|
|
bucket_drain(zone, bucket);
|
|
bucket_free(zone, bucket, NULL);
|
|
ZONE_LOCK(zone);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Shrink further bucket sizes. Price of single zone lock collision
|
|
* is probably lower then price of global cache drain.
|
|
*/
|
|
if (zone->uz_count > zone->uz_count_min)
|
|
zone->uz_count--;
|
|
}
|
|
|
|
static void
|
|
keg_free_slab(uma_keg_t keg, uma_slab_t slab, int start)
|
|
{
|
|
uint8_t *mem;
|
|
int i;
|
|
uint8_t flags;
|
|
|
|
CTR4(KTR_UMA, "keg_free_slab keg %s(%p) slab %p, returning %d bytes",
|
|
keg->uk_name, keg, slab, PAGE_SIZE * keg->uk_ppera);
|
|
|
|
mem = slab->us_data;
|
|
flags = slab->us_flags;
|
|
i = start;
|
|
if (keg->uk_fini != NULL) {
|
|
for (i--; i > -1; i--)
|
|
#ifdef INVARIANTS
|
|
/*
|
|
* trash_fini implies that dtor was trash_dtor. trash_fini
|
|
* would check that memory hasn't been modified since free,
|
|
* which executed trash_dtor.
|
|
* That's why we need to run uma_dbg_kskip() check here,
|
|
* albeit we don't make skip check for other init/fini
|
|
* invocations.
|
|
*/
|
|
if (!uma_dbg_kskip(keg, slab->us_data + (keg->uk_rsize * i)) ||
|
|
keg->uk_fini != trash_fini)
|
|
#endif
|
|
keg->uk_fini(slab->us_data + (keg->uk_rsize * i),
|
|
keg->uk_size);
|
|
}
|
|
if (keg->uk_flags & UMA_ZONE_OFFPAGE)
|
|
zone_free_item(keg->uk_slabzone, slab, NULL, SKIP_NONE);
|
|
keg->uk_freef(mem, PAGE_SIZE * keg->uk_ppera, flags);
|
|
uma_total_dec(PAGE_SIZE * keg->uk_ppera);
|
|
}
|
|
|
|
/*
|
|
* Frees pages from a keg back to the system. This is done on demand from
|
|
* the pageout daemon.
|
|
*
|
|
* Returns nothing.
|
|
*/
|
|
static void
|
|
keg_drain(uma_keg_t keg)
|
|
{
|
|
struct slabhead freeslabs = { 0 };
|
|
uma_domain_t dom;
|
|
uma_slab_t slab, tmp;
|
|
int i;
|
|
|
|
/*
|
|
* We don't want to take pages from statically allocated kegs at this
|
|
* time
|
|
*/
|
|
if (keg->uk_flags & UMA_ZONE_NOFREE || keg->uk_freef == NULL)
|
|
return;
|
|
|
|
CTR3(KTR_UMA, "keg_drain %s(%p) free items: %u",
|
|
keg->uk_name, keg, keg->uk_free);
|
|
KEG_LOCK(keg);
|
|
if (keg->uk_free == 0)
|
|
goto finished;
|
|
|
|
for (i = 0; i < vm_ndomains; i++) {
|
|
dom = &keg->uk_domain[i];
|
|
LIST_FOREACH_SAFE(slab, &dom->ud_free_slab, us_link, tmp) {
|
|
/* We have nowhere to free these to. */
|
|
if (slab->us_flags & UMA_SLAB_BOOT)
|
|
continue;
|
|
|
|
LIST_REMOVE(slab, us_link);
|
|
keg->uk_pages -= keg->uk_ppera;
|
|
keg->uk_free -= keg->uk_ipers;
|
|
|
|
if (keg->uk_flags & UMA_ZONE_HASH)
|
|
UMA_HASH_REMOVE(&keg->uk_hash, slab,
|
|
slab->us_data);
|
|
|
|
SLIST_INSERT_HEAD(&freeslabs, slab, us_hlink);
|
|
}
|
|
}
|
|
|
|
finished:
|
|
KEG_UNLOCK(keg);
|
|
|
|
while ((slab = SLIST_FIRST(&freeslabs)) != NULL) {
|
|
SLIST_REMOVE(&freeslabs, slab, uma_slab, us_hlink);
|
|
keg_free_slab(keg, slab, keg->uk_ipers);
|
|
}
|
|
}
|
|
|
|
static void
|
|
zone_drain_wait(uma_zone_t zone, int waitok)
|
|
{
|
|
|
|
/*
|
|
* Set draining to interlock with zone_dtor() so we can release our
|
|
* locks as we go. Only dtor() should do a WAITOK call since it
|
|
* is the only call that knows the structure will still be available
|
|
* when it wakes up.
|
|
*/
|
|
ZONE_LOCK(zone);
|
|
while (zone->uz_flags & UMA_ZFLAG_DRAINING) {
|
|
if (waitok == M_NOWAIT)
|
|
goto out;
|
|
msleep(zone, zone->uz_lockptr, PVM, "zonedrain", 1);
|
|
}
|
|
zone->uz_flags |= UMA_ZFLAG_DRAINING;
|
|
bucket_cache_drain(zone);
|
|
ZONE_UNLOCK(zone);
|
|
/*
|
|
* The DRAINING flag protects us from being freed while
|
|
* we're running. Normally the uma_rwlock would protect us but we
|
|
* must be able to release and acquire the right lock for each keg.
|
|
*/
|
|
keg_drain(zone->uz_keg);
|
|
ZONE_LOCK(zone);
|
|
zone->uz_flags &= ~UMA_ZFLAG_DRAINING;
|
|
wakeup(zone);
|
|
out:
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
void
|
|
zone_drain(uma_zone_t zone)
|
|
{
|
|
|
|
zone_drain_wait(zone, M_NOWAIT);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new slab for a keg. This does not insert the slab onto a list.
|
|
* If the allocation was successful, the keg lock will be held upon return,
|
|
* otherwise the keg will be left unlocked.
|
|
*
|
|
* Arguments:
|
|
* flags Wait flags for the item initialization routine
|
|
* aflags Wait flags for the slab allocation
|
|
*
|
|
* Returns:
|
|
* The slab that was allocated or NULL if there is no memory and the
|
|
* caller specified M_NOWAIT.
|
|
*/
|
|
static uma_slab_t
|
|
keg_alloc_slab(uma_keg_t keg, uma_zone_t zone, int domain, int flags,
|
|
int aflags)
|
|
{
|
|
uma_alloc allocf;
|
|
uma_slab_t slab;
|
|
unsigned long size;
|
|
uint8_t *mem;
|
|
uint8_t sflags;
|
|
int i;
|
|
|
|
KASSERT(domain >= 0 && domain < vm_ndomains,
|
|
("keg_alloc_slab: domain %d out of range", domain));
|
|
KEG_LOCK_ASSERT(keg);
|
|
MPASS(zone->uz_lockptr == &keg->uk_lock);
|
|
|
|
allocf = keg->uk_allocf;
|
|
KEG_UNLOCK(keg);
|
|
|
|
slab = NULL;
|
|
mem = NULL;
|
|
if (keg->uk_flags & UMA_ZONE_OFFPAGE) {
|
|
slab = zone_alloc_item(keg->uk_slabzone, NULL, domain, aflags);
|
|
if (slab == NULL)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* This reproduces the old vm_zone behavior of zero filling pages the
|
|
* first time they are added to a zone.
|
|
*
|
|
* Malloced items are zeroed in uma_zalloc.
|
|
*/
|
|
|
|
if ((keg->uk_flags & UMA_ZONE_MALLOC) == 0)
|
|
aflags |= M_ZERO;
|
|
else
|
|
aflags &= ~M_ZERO;
|
|
|
|
if (keg->uk_flags & UMA_ZONE_NODUMP)
|
|
aflags |= M_NODUMP;
|
|
|
|
/* zone is passed for legacy reasons. */
|
|
size = keg->uk_ppera * PAGE_SIZE;
|
|
mem = allocf(zone, size, domain, &sflags, aflags);
|
|
if (mem == NULL) {
|
|
if (keg->uk_flags & UMA_ZONE_OFFPAGE)
|
|
zone_free_item(keg->uk_slabzone, slab, NULL, SKIP_NONE);
|
|
slab = NULL;
|
|
goto out;
|
|
}
|
|
uma_total_inc(size);
|
|
|
|
/* Point the slab into the allocated memory */
|
|
if (!(keg->uk_flags & UMA_ZONE_OFFPAGE))
|
|
slab = (uma_slab_t )(mem + keg->uk_pgoff);
|
|
|
|
if (keg->uk_flags & UMA_ZONE_VTOSLAB)
|
|
for (i = 0; i < keg->uk_ppera; i++)
|
|
vsetslab((vm_offset_t)mem + (i * PAGE_SIZE), slab);
|
|
|
|
slab->us_keg = keg;
|
|
slab->us_data = mem;
|
|
slab->us_freecount = keg->uk_ipers;
|
|
slab->us_flags = sflags;
|
|
slab->us_domain = domain;
|
|
BIT_FILL(SLAB_SETSIZE, &slab->us_free);
|
|
#ifdef INVARIANTS
|
|
BIT_ZERO(SLAB_SETSIZE, &slab->us_debugfree);
|
|
#endif
|
|
|
|
if (keg->uk_init != NULL) {
|
|
for (i = 0; i < keg->uk_ipers; i++)
|
|
if (keg->uk_init(slab->us_data + (keg->uk_rsize * i),
|
|
keg->uk_size, flags) != 0)
|
|
break;
|
|
if (i != keg->uk_ipers) {
|
|
keg_free_slab(keg, slab, i);
|
|
slab = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
KEG_LOCK(keg);
|
|
|
|
CTR3(KTR_UMA, "keg_alloc_slab: allocated slab %p for %s(%p)",
|
|
slab, keg->uk_name, keg);
|
|
|
|
if (keg->uk_flags & UMA_ZONE_HASH)
|
|
UMA_HASH_INSERT(&keg->uk_hash, slab, mem);
|
|
|
|
keg->uk_pages += keg->uk_ppera;
|
|
keg->uk_free += keg->uk_ipers;
|
|
|
|
out:
|
|
return (slab);
|
|
}
|
|
|
|
/*
|
|
* This function is intended to be used early on in place of page_alloc() so
|
|
* that we may use the boot time page cache to satisfy allocations before
|
|
* the VM is ready.
|
|
*/
|
|
static void *
|
|
startup_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
|
|
int wait)
|
|
{
|
|
uma_keg_t keg;
|
|
void *mem;
|
|
int pages;
|
|
|
|
keg = zone->uz_keg;
|
|
/*
|
|
* If we are in BOOT_BUCKETS or higher, than switch to real
|
|
* allocator. Zones with page sized slabs switch at BOOT_PAGEALLOC.
|
|
*/
|
|
switch (booted) {
|
|
case BOOT_COLD:
|
|
case BOOT_STRAPPED:
|
|
break;
|
|
case BOOT_PAGEALLOC:
|
|
if (keg->uk_ppera > 1)
|
|
break;
|
|
case BOOT_BUCKETS:
|
|
case BOOT_RUNNING:
|
|
#ifdef UMA_MD_SMALL_ALLOC
|
|
keg->uk_allocf = (keg->uk_ppera > 1) ?
|
|
page_alloc : uma_small_alloc;
|
|
#else
|
|
keg->uk_allocf = page_alloc;
|
|
#endif
|
|
return keg->uk_allocf(zone, bytes, domain, pflag, wait);
|
|
}
|
|
|
|
/*
|
|
* Check our small startup cache to see if it has pages remaining.
|
|
*/
|
|
pages = howmany(bytes, PAGE_SIZE);
|
|
KASSERT(pages > 0, ("%s can't reserve 0 pages", __func__));
|
|
if (pages > boot_pages)
|
|
panic("UMA zone \"%s\": Increase vm.boot_pages", zone->uz_name);
|
|
#ifdef DIAGNOSTIC
|
|
printf("%s from \"%s\", %d boot pages left\n", __func__, zone->uz_name,
|
|
boot_pages);
|
|
#endif
|
|
mem = bootmem;
|
|
boot_pages -= pages;
|
|
bootmem += pages * PAGE_SIZE;
|
|
*pflag = UMA_SLAB_BOOT;
|
|
|
|
return (mem);
|
|
}
|
|
|
|
/*
|
|
* Allocates a number of pages from the system
|
|
*
|
|
* Arguments:
|
|
* bytes The number of bytes requested
|
|
* wait Shall we wait?
|
|
*
|
|
* Returns:
|
|
* A pointer to the alloced memory or possibly
|
|
* NULL if M_NOWAIT is set.
|
|
*/
|
|
static void *
|
|
page_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
|
|
int wait)
|
|
{
|
|
void *p; /* Returned page */
|
|
|
|
*pflag = UMA_SLAB_KERNEL;
|
|
p = (void *)kmem_malloc_domainset(DOMAINSET_FIXED(domain), bytes, wait);
|
|
|
|
return (p);
|
|
}
|
|
|
|
static void *
|
|
pcpu_page_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *pflag,
|
|
int wait)
|
|
{
|
|
struct pglist alloctail;
|
|
vm_offset_t addr, zkva;
|
|
int cpu, flags;
|
|
vm_page_t p, p_next;
|
|
#ifdef NUMA
|
|
struct pcpu *pc;
|
|
#endif
|
|
|
|
MPASS(bytes == (mp_maxid + 1) * PAGE_SIZE);
|
|
|
|
TAILQ_INIT(&alloctail);
|
|
flags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED | VM_ALLOC_NOOBJ |
|
|
malloc2vm_flags(wait);
|
|
*pflag = UMA_SLAB_KERNEL;
|
|
for (cpu = 0; cpu <= mp_maxid; cpu++) {
|
|
if (CPU_ABSENT(cpu)) {
|
|
p = vm_page_alloc(NULL, 0, flags);
|
|
} else {
|
|
#ifndef NUMA
|
|
p = vm_page_alloc(NULL, 0, flags);
|
|
#else
|
|
pc = pcpu_find(cpu);
|
|
p = vm_page_alloc_domain(NULL, 0, pc->pc_domain, flags);
|
|
if (__predict_false(p == NULL))
|
|
p = vm_page_alloc(NULL, 0, flags);
|
|
#endif
|
|
}
|
|
if (__predict_false(p == NULL))
|
|
goto fail;
|
|
TAILQ_INSERT_TAIL(&alloctail, p, listq);
|
|
}
|
|
if ((addr = kva_alloc(bytes)) == 0)
|
|
goto fail;
|
|
zkva = addr;
|
|
TAILQ_FOREACH(p, &alloctail, listq) {
|
|
pmap_qenter(zkva, &p, 1);
|
|
zkva += PAGE_SIZE;
|
|
}
|
|
return ((void*)addr);
|
|
fail:
|
|
TAILQ_FOREACH_SAFE(p, &alloctail, listq, p_next) {
|
|
vm_page_unwire_noq(p);
|
|
vm_page_free(p);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Allocates a number of pages from within an object
|
|
*
|
|
* Arguments:
|
|
* bytes The number of bytes requested
|
|
* wait Shall we wait?
|
|
*
|
|
* Returns:
|
|
* A pointer to the alloced memory or possibly
|
|
* NULL if M_NOWAIT is set.
|
|
*/
|
|
static void *
|
|
noobj_alloc(uma_zone_t zone, vm_size_t bytes, int domain, uint8_t *flags,
|
|
int wait)
|
|
{
|
|
TAILQ_HEAD(, vm_page) alloctail;
|
|
u_long npages;
|
|
vm_offset_t retkva, zkva;
|
|
vm_page_t p, p_next;
|
|
uma_keg_t keg;
|
|
|
|
TAILQ_INIT(&alloctail);
|
|
keg = zone->uz_keg;
|
|
|
|
npages = howmany(bytes, PAGE_SIZE);
|
|
while (npages > 0) {
|
|
p = vm_page_alloc_domain(NULL, 0, domain, VM_ALLOC_INTERRUPT |
|
|
VM_ALLOC_WIRED | VM_ALLOC_NOOBJ |
|
|
((wait & M_WAITOK) != 0 ? VM_ALLOC_WAITOK :
|
|
VM_ALLOC_NOWAIT));
|
|
if (p != NULL) {
|
|
/*
|
|
* Since the page does not belong to an object, its
|
|
* listq is unused.
|
|
*/
|
|
TAILQ_INSERT_TAIL(&alloctail, p, listq);
|
|
npages--;
|
|
continue;
|
|
}
|
|
/*
|
|
* Page allocation failed, free intermediate pages and
|
|
* exit.
|
|
*/
|
|
TAILQ_FOREACH_SAFE(p, &alloctail, listq, p_next) {
|
|
vm_page_unwire_noq(p);
|
|
vm_page_free(p);
|
|
}
|
|
return (NULL);
|
|
}
|
|
*flags = UMA_SLAB_PRIV;
|
|
zkva = keg->uk_kva +
|
|
atomic_fetchadd_long(&keg->uk_offset, round_page(bytes));
|
|
retkva = zkva;
|
|
TAILQ_FOREACH(p, &alloctail, listq) {
|
|
pmap_qenter(zkva, &p, 1);
|
|
zkva += PAGE_SIZE;
|
|
}
|
|
|
|
return ((void *)retkva);
|
|
}
|
|
|
|
/*
|
|
* Frees a number of pages to the system
|
|
*
|
|
* Arguments:
|
|
* mem A pointer to the memory to be freed
|
|
* size The size of the memory being freed
|
|
* flags The original p->us_flags field
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
static void
|
|
page_free(void *mem, vm_size_t size, uint8_t flags)
|
|
{
|
|
|
|
if ((flags & UMA_SLAB_KERNEL) == 0)
|
|
panic("UMA: page_free used with invalid flags %x", flags);
|
|
|
|
kmem_free((vm_offset_t)mem, size);
|
|
}
|
|
|
|
/*
|
|
* Frees pcpu zone allocations
|
|
*
|
|
* Arguments:
|
|
* mem A pointer to the memory to be freed
|
|
* size The size of the memory being freed
|
|
* flags The original p->us_flags field
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
static void
|
|
pcpu_page_free(void *mem, vm_size_t size, uint8_t flags)
|
|
{
|
|
vm_offset_t sva, curva;
|
|
vm_paddr_t paddr;
|
|
vm_page_t m;
|
|
|
|
MPASS(size == (mp_maxid+1)*PAGE_SIZE);
|
|
sva = (vm_offset_t)mem;
|
|
for (curva = sva; curva < sva + size; curva += PAGE_SIZE) {
|
|
paddr = pmap_kextract(curva);
|
|
m = PHYS_TO_VM_PAGE(paddr);
|
|
vm_page_unwire_noq(m);
|
|
vm_page_free(m);
|
|
}
|
|
pmap_qremove(sva, size >> PAGE_SHIFT);
|
|
kva_free(sva, size);
|
|
}
|
|
|
|
|
|
/*
|
|
* Zero fill initializer
|
|
*
|
|
* Arguments/Returns follow uma_init specifications
|
|
*/
|
|
static int
|
|
zero_init(void *mem, int size, int flags)
|
|
{
|
|
bzero(mem, size);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Finish creating a small uma keg. This calculates ipers, and the keg size.
|
|
*
|
|
* Arguments
|
|
* keg The zone we should initialize
|
|
*
|
|
* Returns
|
|
* Nothing
|
|
*/
|
|
static void
|
|
keg_small_init(uma_keg_t keg)
|
|
{
|
|
u_int rsize;
|
|
u_int memused;
|
|
u_int wastedspace;
|
|
u_int shsize;
|
|
u_int slabsize;
|
|
|
|
if (keg->uk_flags & UMA_ZONE_PCPU) {
|
|
u_int ncpus = (mp_maxid + 1) ? (mp_maxid + 1) : MAXCPU;
|
|
|
|
slabsize = UMA_PCPU_ALLOC_SIZE;
|
|
keg->uk_ppera = ncpus;
|
|
} else {
|
|
slabsize = UMA_SLAB_SIZE;
|
|
keg->uk_ppera = 1;
|
|
}
|
|
|
|
/*
|
|
* Calculate the size of each allocation (rsize) according to
|
|
* alignment. If the requested size is smaller than we have
|
|
* allocation bits for we round it up.
|
|
*/
|
|
rsize = keg->uk_size;
|
|
if (rsize < slabsize / SLAB_SETSIZE)
|
|
rsize = slabsize / SLAB_SETSIZE;
|
|
if (rsize & keg->uk_align)
|
|
rsize = (rsize & ~keg->uk_align) + (keg->uk_align + 1);
|
|
keg->uk_rsize = rsize;
|
|
|
|
KASSERT((keg->uk_flags & UMA_ZONE_PCPU) == 0 ||
|
|
keg->uk_rsize < UMA_PCPU_ALLOC_SIZE,
|
|
("%s: size %u too large", __func__, keg->uk_rsize));
|
|
|
|
if (keg->uk_flags & UMA_ZONE_OFFPAGE)
|
|
shsize = 0;
|
|
else
|
|
shsize = SIZEOF_UMA_SLAB;
|
|
|
|
if (rsize <= slabsize - shsize)
|
|
keg->uk_ipers = (slabsize - shsize) / rsize;
|
|
else {
|
|
/* Handle special case when we have 1 item per slab, so
|
|
* alignment requirement can be relaxed. */
|
|
KASSERT(keg->uk_size <= slabsize - shsize,
|
|
("%s: size %u greater than slab", __func__, keg->uk_size));
|
|
keg->uk_ipers = 1;
|
|
}
|
|
KASSERT(keg->uk_ipers > 0 && keg->uk_ipers <= SLAB_SETSIZE,
|
|
("%s: keg->uk_ipers %u", __func__, keg->uk_ipers));
|
|
|
|
memused = keg->uk_ipers * rsize + shsize;
|
|
wastedspace = slabsize - memused;
|
|
|
|
/*
|
|
* We can't do OFFPAGE if we're internal or if we've been
|
|
* asked to not go to the VM for buckets. If we do this we
|
|
* may end up going to the VM for slabs which we do not
|
|
* want to do if we're UMA_ZFLAG_CACHEONLY as a result
|
|
* of UMA_ZONE_VM, which clearly forbids it.
|
|
*/
|
|
if ((keg->uk_flags & UMA_ZFLAG_INTERNAL) ||
|
|
(keg->uk_flags & UMA_ZFLAG_CACHEONLY))
|
|
return;
|
|
|
|
/*
|
|
* See if using an OFFPAGE slab will limit our waste. Only do
|
|
* this if it permits more items per-slab.
|
|
*
|
|
* XXX We could try growing slabsize to limit max waste as well.
|
|
* Historically this was not done because the VM could not
|
|
* efficiently handle contiguous allocations.
|
|
*/
|
|
if ((wastedspace >= slabsize / UMA_MAX_WASTE) &&
|
|
(keg->uk_ipers < (slabsize / keg->uk_rsize))) {
|
|
keg->uk_ipers = slabsize / keg->uk_rsize;
|
|
KASSERT(keg->uk_ipers > 0 && keg->uk_ipers <= SLAB_SETSIZE,
|
|
("%s: keg->uk_ipers %u", __func__, keg->uk_ipers));
|
|
CTR6(KTR_UMA, "UMA decided we need offpage slab headers for "
|
|
"keg: %s(%p), calculated wastedspace = %d, "
|
|
"maximum wasted space allowed = %d, "
|
|
"calculated ipers = %d, "
|
|
"new wasted space = %d\n", keg->uk_name, keg, wastedspace,
|
|
slabsize / UMA_MAX_WASTE, keg->uk_ipers,
|
|
slabsize - keg->uk_ipers * keg->uk_rsize);
|
|
keg->uk_flags |= UMA_ZONE_OFFPAGE;
|
|
}
|
|
|
|
if ((keg->uk_flags & UMA_ZONE_OFFPAGE) &&
|
|
(keg->uk_flags & UMA_ZONE_VTOSLAB) == 0)
|
|
keg->uk_flags |= UMA_ZONE_HASH;
|
|
}
|
|
|
|
/*
|
|
* Finish creating a large (> UMA_SLAB_SIZE) uma kegs. Just give in and do
|
|
* OFFPAGE for now. When I can allow for more dynamic slab sizes this will be
|
|
* more complicated.
|
|
*
|
|
* Arguments
|
|
* keg The keg we should initialize
|
|
*
|
|
* Returns
|
|
* Nothing
|
|
*/
|
|
static void
|
|
keg_large_init(uma_keg_t keg)
|
|
{
|
|
|
|
KASSERT(keg != NULL, ("Keg is null in keg_large_init"));
|
|
KASSERT((keg->uk_flags & UMA_ZONE_PCPU) == 0,
|
|
("%s: Cannot large-init a UMA_ZONE_PCPU keg", __func__));
|
|
|
|
keg->uk_ppera = howmany(keg->uk_size, PAGE_SIZE);
|
|
keg->uk_ipers = 1;
|
|
keg->uk_rsize = keg->uk_size;
|
|
|
|
/* Check whether we have enough space to not do OFFPAGE. */
|
|
if ((keg->uk_flags & UMA_ZONE_OFFPAGE) == 0 &&
|
|
PAGE_SIZE * keg->uk_ppera - keg->uk_rsize < SIZEOF_UMA_SLAB) {
|
|
/*
|
|
* We can't do OFFPAGE if we're internal, in which case
|
|
* we need an extra page per allocation to contain the
|
|
* slab header.
|
|
*/
|
|
if ((keg->uk_flags & UMA_ZFLAG_INTERNAL) == 0)
|
|
keg->uk_flags |= UMA_ZONE_OFFPAGE;
|
|
else
|
|
keg->uk_ppera++;
|
|
}
|
|
|
|
if ((keg->uk_flags & UMA_ZONE_OFFPAGE) &&
|
|
(keg->uk_flags & UMA_ZONE_VTOSLAB) == 0)
|
|
keg->uk_flags |= UMA_ZONE_HASH;
|
|
}
|
|
|
|
static void
|
|
keg_cachespread_init(uma_keg_t keg)
|
|
{
|
|
int alignsize;
|
|
int trailer;
|
|
int pages;
|
|
int rsize;
|
|
|
|
KASSERT((keg->uk_flags & UMA_ZONE_PCPU) == 0,
|
|
("%s: Cannot cachespread-init a UMA_ZONE_PCPU keg", __func__));
|
|
|
|
alignsize = keg->uk_align + 1;
|
|
rsize = keg->uk_size;
|
|
/*
|
|
* We want one item to start on every align boundary in a page. To
|
|
* do this we will span pages. We will also extend the item by the
|
|
* size of align if it is an even multiple of align. Otherwise, it
|
|
* would fall on the same boundary every time.
|
|
*/
|
|
if (rsize & keg->uk_align)
|
|
rsize = (rsize & ~keg->uk_align) + alignsize;
|
|
if ((rsize & alignsize) == 0)
|
|
rsize += alignsize;
|
|
trailer = rsize - keg->uk_size;
|
|
pages = (rsize * (PAGE_SIZE / alignsize)) / PAGE_SIZE;
|
|
pages = MIN(pages, (128 * 1024) / PAGE_SIZE);
|
|
keg->uk_rsize = rsize;
|
|
keg->uk_ppera = pages;
|
|
keg->uk_ipers = ((pages * PAGE_SIZE) + trailer) / rsize;
|
|
keg->uk_flags |= UMA_ZONE_OFFPAGE | UMA_ZONE_VTOSLAB;
|
|
KASSERT(keg->uk_ipers <= SLAB_SETSIZE,
|
|
("%s: keg->uk_ipers too high(%d) increase max_ipers", __func__,
|
|
keg->uk_ipers));
|
|
}
|
|
|
|
/*
|
|
* Keg header ctor. This initializes all fields, locks, etc. And inserts
|
|
* the keg onto the global keg list.
|
|
*
|
|
* Arguments/Returns follow uma_ctor specifications
|
|
* udata Actually uma_kctor_args
|
|
*/
|
|
static int
|
|
keg_ctor(void *mem, int size, void *udata, int flags)
|
|
{
|
|
struct uma_kctor_args *arg = udata;
|
|
uma_keg_t keg = mem;
|
|
uma_zone_t zone;
|
|
|
|
bzero(keg, size);
|
|
keg->uk_size = arg->size;
|
|
keg->uk_init = arg->uminit;
|
|
keg->uk_fini = arg->fini;
|
|
keg->uk_align = arg->align;
|
|
keg->uk_free = 0;
|
|
keg->uk_reserve = 0;
|
|
keg->uk_pages = 0;
|
|
keg->uk_flags = arg->flags;
|
|
keg->uk_slabzone = NULL;
|
|
|
|
/*
|
|
* We use a global round-robin policy by default. Zones with
|
|
* UMA_ZONE_NUMA set will use first-touch instead, in which case the
|
|
* iterator is never run.
|
|
*/
|
|
keg->uk_dr.dr_policy = DOMAINSET_RR();
|
|
keg->uk_dr.dr_iter = 0;
|
|
|
|
/*
|
|
* The master zone is passed to us at keg-creation time.
|
|
*/
|
|
zone = arg->zone;
|
|
keg->uk_name = zone->uz_name;
|
|
|
|
if (arg->flags & UMA_ZONE_VM)
|
|
keg->uk_flags |= UMA_ZFLAG_CACHEONLY;
|
|
|
|
if (arg->flags & UMA_ZONE_ZINIT)
|
|
keg->uk_init = zero_init;
|
|
|
|
if (arg->flags & UMA_ZONE_MALLOC)
|
|
keg->uk_flags |= UMA_ZONE_VTOSLAB;
|
|
|
|
if (arg->flags & UMA_ZONE_PCPU)
|
|
#ifdef SMP
|
|
keg->uk_flags |= UMA_ZONE_OFFPAGE;
|
|
#else
|
|
keg->uk_flags &= ~UMA_ZONE_PCPU;
|
|
#endif
|
|
|
|
if (keg->uk_flags & UMA_ZONE_CACHESPREAD) {
|
|
keg_cachespread_init(keg);
|
|
} else {
|
|
if (keg->uk_size > UMA_SLAB_SPACE)
|
|
keg_large_init(keg);
|
|
else
|
|
keg_small_init(keg);
|
|
}
|
|
|
|
if (keg->uk_flags & UMA_ZONE_OFFPAGE)
|
|
keg->uk_slabzone = slabzone;
|
|
|
|
/*
|
|
* If we haven't booted yet we need allocations to go through the
|
|
* startup cache until the vm is ready.
|
|
*/
|
|
if (booted < BOOT_PAGEALLOC)
|
|
keg->uk_allocf = startup_alloc;
|
|
#ifdef UMA_MD_SMALL_ALLOC
|
|
else if (keg->uk_ppera == 1)
|
|
keg->uk_allocf = uma_small_alloc;
|
|
#endif
|
|
else if (keg->uk_flags & UMA_ZONE_PCPU)
|
|
keg->uk_allocf = pcpu_page_alloc;
|
|
else
|
|
keg->uk_allocf = page_alloc;
|
|
#ifdef UMA_MD_SMALL_ALLOC
|
|
if (keg->uk_ppera == 1)
|
|
keg->uk_freef = uma_small_free;
|
|
else
|
|
#endif
|
|
if (keg->uk_flags & UMA_ZONE_PCPU)
|
|
keg->uk_freef = pcpu_page_free;
|
|
else
|
|
keg->uk_freef = page_free;
|
|
|
|
/*
|
|
* Initialize keg's lock
|
|
*/
|
|
KEG_LOCK_INIT(keg, (arg->flags & UMA_ZONE_MTXCLASS));
|
|
|
|
/*
|
|
* If we're putting the slab header in the actual page we need to
|
|
* figure out where in each page it goes. See SIZEOF_UMA_SLAB
|
|
* macro definition.
|
|
*/
|
|
if (!(keg->uk_flags & UMA_ZONE_OFFPAGE)) {
|
|
keg->uk_pgoff = (PAGE_SIZE * keg->uk_ppera) - SIZEOF_UMA_SLAB;
|
|
/*
|
|
* The only way the following is possible is if with our
|
|
* UMA_ALIGN_PTR adjustments we are now bigger than
|
|
* UMA_SLAB_SIZE. I haven't checked whether this is
|
|
* mathematically possible for all cases, so we make
|
|
* sure here anyway.
|
|
*/
|
|
KASSERT(keg->uk_pgoff + sizeof(struct uma_slab) <=
|
|
PAGE_SIZE * keg->uk_ppera,
|
|
("zone %s ipers %d rsize %d size %d slab won't fit",
|
|
zone->uz_name, keg->uk_ipers, keg->uk_rsize, keg->uk_size));
|
|
}
|
|
|
|
if (keg->uk_flags & UMA_ZONE_HASH)
|
|
hash_alloc(&keg->uk_hash, 0);
|
|
|
|
CTR5(KTR_UMA, "keg_ctor %p zone %s(%p) out %d free %d\n",
|
|
keg, zone->uz_name, zone,
|
|
(keg->uk_pages / keg->uk_ppera) * keg->uk_ipers - keg->uk_free,
|
|
keg->uk_free);
|
|
|
|
LIST_INSERT_HEAD(&keg->uk_zones, zone, uz_link);
|
|
|
|
rw_wlock(&uma_rwlock);
|
|
LIST_INSERT_HEAD(&uma_kegs, keg, uk_link);
|
|
rw_wunlock(&uma_rwlock);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
zone_alloc_counters(uma_zone_t zone)
|
|
{
|
|
|
|
zone->uz_allocs = counter_u64_alloc(M_WAITOK);
|
|
zone->uz_frees = counter_u64_alloc(M_WAITOK);
|
|
zone->uz_fails = counter_u64_alloc(M_WAITOK);
|
|
}
|
|
|
|
/*
|
|
* Zone header ctor. This initializes all fields, locks, etc.
|
|
*
|
|
* Arguments/Returns follow uma_ctor specifications
|
|
* udata Actually uma_zctor_args
|
|
*/
|
|
static int
|
|
zone_ctor(void *mem, int size, void *udata, int flags)
|
|
{
|
|
struct uma_zctor_args *arg = udata;
|
|
uma_zone_t zone = mem;
|
|
uma_zone_t z;
|
|
uma_keg_t keg;
|
|
|
|
bzero(zone, size);
|
|
zone->uz_name = arg->name;
|
|
zone->uz_ctor = arg->ctor;
|
|
zone->uz_dtor = arg->dtor;
|
|
zone->uz_init = NULL;
|
|
zone->uz_fini = NULL;
|
|
zone->uz_sleeps = 0;
|
|
zone->uz_count = 0;
|
|
zone->uz_count_min = 0;
|
|
zone->uz_count_max = BUCKET_MAX;
|
|
zone->uz_flags = 0;
|
|
zone->uz_warning = NULL;
|
|
/* The domain structures follow the cpu structures. */
|
|
zone->uz_domain = (struct uma_zone_domain *)&zone->uz_cpu[mp_ncpus];
|
|
zone->uz_bkt_max = ULONG_MAX;
|
|
timevalclear(&zone->uz_ratecheck);
|
|
|
|
if (__predict_true(booted == BOOT_RUNNING))
|
|
zone_alloc_counters(zone);
|
|
else {
|
|
zone->uz_allocs = EARLY_COUNTER;
|
|
zone->uz_frees = EARLY_COUNTER;
|
|
zone->uz_fails = EARLY_COUNTER;
|
|
}
|
|
|
|
/*
|
|
* This is a pure cache zone, no kegs.
|
|
*/
|
|
if (arg->import) {
|
|
if (arg->flags & UMA_ZONE_VM)
|
|
arg->flags |= UMA_ZFLAG_CACHEONLY;
|
|
zone->uz_flags = arg->flags;
|
|
zone->uz_size = arg->size;
|
|
zone->uz_import = arg->import;
|
|
zone->uz_release = arg->release;
|
|
zone->uz_arg = arg->arg;
|
|
zone->uz_lockptr = &zone->uz_lock;
|
|
ZONE_LOCK_INIT(zone, (arg->flags & UMA_ZONE_MTXCLASS));
|
|
rw_wlock(&uma_rwlock);
|
|
LIST_INSERT_HEAD(&uma_cachezones, zone, uz_link);
|
|
rw_wunlock(&uma_rwlock);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Use the regular zone/keg/slab allocator.
|
|
*/
|
|
zone->uz_import = (uma_import)zone_import;
|
|
zone->uz_release = (uma_release)zone_release;
|
|
zone->uz_arg = zone;
|
|
keg = arg->keg;
|
|
|
|
if (arg->flags & UMA_ZONE_SECONDARY) {
|
|
KASSERT(arg->keg != NULL, ("Secondary zone on zero'd keg"));
|
|
zone->uz_init = arg->uminit;
|
|
zone->uz_fini = arg->fini;
|
|
zone->uz_lockptr = &keg->uk_lock;
|
|
zone->uz_flags |= UMA_ZONE_SECONDARY;
|
|
rw_wlock(&uma_rwlock);
|
|
ZONE_LOCK(zone);
|
|
LIST_FOREACH(z, &keg->uk_zones, uz_link) {
|
|
if (LIST_NEXT(z, uz_link) == NULL) {
|
|
LIST_INSERT_AFTER(z, zone, uz_link);
|
|
break;
|
|
}
|
|
}
|
|
ZONE_UNLOCK(zone);
|
|
rw_wunlock(&uma_rwlock);
|
|
} else if (keg == NULL) {
|
|
if ((keg = uma_kcreate(zone, arg->size, arg->uminit, arg->fini,
|
|
arg->align, arg->flags)) == NULL)
|
|
return (ENOMEM);
|
|
} else {
|
|
struct uma_kctor_args karg;
|
|
int error;
|
|
|
|
/* We should only be here from uma_startup() */
|
|
karg.size = arg->size;
|
|
karg.uminit = arg->uminit;
|
|
karg.fini = arg->fini;
|
|
karg.align = arg->align;
|
|
karg.flags = arg->flags;
|
|
karg.zone = zone;
|
|
error = keg_ctor(arg->keg, sizeof(struct uma_keg), &karg,
|
|
flags);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
zone->uz_keg = keg;
|
|
zone->uz_size = keg->uk_size;
|
|
zone->uz_flags |= (keg->uk_flags &
|
|
(UMA_ZONE_INHERIT | UMA_ZFLAG_INHERIT));
|
|
|
|
/*
|
|
* Some internal zones don't have room allocated for the per cpu
|
|
* caches. If we're internal, bail out here.
|
|
*/
|
|
if (keg->uk_flags & UMA_ZFLAG_INTERNAL) {
|
|
KASSERT((zone->uz_flags & UMA_ZONE_SECONDARY) == 0,
|
|
("Secondary zone requested UMA_ZFLAG_INTERNAL"));
|
|
return (0);
|
|
}
|
|
|
|
out:
|
|
KASSERT((arg->flags & (UMA_ZONE_MAXBUCKET | UMA_ZONE_NOBUCKET)) !=
|
|
(UMA_ZONE_MAXBUCKET | UMA_ZONE_NOBUCKET),
|
|
("Invalid zone flag combination"));
|
|
if ((arg->flags & UMA_ZONE_MAXBUCKET) != 0)
|
|
zone->uz_count = BUCKET_MAX;
|
|
else if ((arg->flags & UMA_ZONE_NOBUCKET) != 0)
|
|
zone->uz_count = 0;
|
|
else
|
|
zone->uz_count = bucket_select(zone->uz_size);
|
|
zone->uz_count_min = zone->uz_count;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Keg header dtor. This frees all data, destroys locks, frees the hash
|
|
* table and removes the keg from the global list.
|
|
*
|
|
* Arguments/Returns follow uma_dtor specifications
|
|
* udata unused
|
|
*/
|
|
static void
|
|
keg_dtor(void *arg, int size, void *udata)
|
|
{
|
|
uma_keg_t keg;
|
|
|
|
keg = (uma_keg_t)arg;
|
|
KEG_LOCK(keg);
|
|
if (keg->uk_free != 0) {
|
|
printf("Freed UMA keg (%s) was not empty (%d items). "
|
|
" Lost %d pages of memory.\n",
|
|
keg->uk_name ? keg->uk_name : "",
|
|
keg->uk_free, keg->uk_pages);
|
|
}
|
|
KEG_UNLOCK(keg);
|
|
|
|
hash_free(&keg->uk_hash);
|
|
|
|
KEG_LOCK_FINI(keg);
|
|
}
|
|
|
|
/*
|
|
* Zone header dtor.
|
|
*
|
|
* Arguments/Returns follow uma_dtor specifications
|
|
* udata unused
|
|
*/
|
|
static void
|
|
zone_dtor(void *arg, int size, void *udata)
|
|
{
|
|
uma_zone_t zone;
|
|
uma_keg_t keg;
|
|
|
|
zone = (uma_zone_t)arg;
|
|
|
|
if (!(zone->uz_flags & UMA_ZFLAG_INTERNAL))
|
|
cache_drain(zone);
|
|
|
|
rw_wlock(&uma_rwlock);
|
|
LIST_REMOVE(zone, uz_link);
|
|
rw_wunlock(&uma_rwlock);
|
|
/*
|
|
* XXX there are some races here where
|
|
* the zone can be drained but zone lock
|
|
* released and then refilled before we
|
|
* remove it... we dont care for now
|
|
*/
|
|
zone_drain_wait(zone, M_WAITOK);
|
|
/*
|
|
* We only destroy kegs from non secondary/non cache zones.
|
|
*/
|
|
if ((zone->uz_flags & (UMA_ZONE_SECONDARY | UMA_ZFLAG_CACHE)) == 0) {
|
|
keg = zone->uz_keg;
|
|
rw_wlock(&uma_rwlock);
|
|
LIST_REMOVE(keg, uk_link);
|
|
rw_wunlock(&uma_rwlock);
|
|
zone_free_item(kegs, keg, NULL, SKIP_NONE);
|
|
}
|
|
counter_u64_free(zone->uz_allocs);
|
|
counter_u64_free(zone->uz_frees);
|
|
counter_u64_free(zone->uz_fails);
|
|
if (zone->uz_lockptr == &zone->uz_lock)
|
|
ZONE_LOCK_FINI(zone);
|
|
}
|
|
|
|
/*
|
|
* Traverses every zone in the system and calls a callback
|
|
*
|
|
* Arguments:
|
|
* zfunc A pointer to a function which accepts a zone
|
|
* as an argument.
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
static void
|
|
zone_foreach(void (*zfunc)(uma_zone_t))
|
|
{
|
|
uma_keg_t keg;
|
|
uma_zone_t zone;
|
|
|
|
/*
|
|
* Before BOOT_RUNNING we are guaranteed to be single
|
|
* threaded, so locking isn't needed. Startup functions
|
|
* are allowed to use M_WAITOK.
|
|
*/
|
|
if (__predict_true(booted == BOOT_RUNNING))
|
|
rw_rlock(&uma_rwlock);
|
|
LIST_FOREACH(keg, &uma_kegs, uk_link) {
|
|
LIST_FOREACH(zone, &keg->uk_zones, uz_link)
|
|
zfunc(zone);
|
|
}
|
|
if (__predict_true(booted == BOOT_RUNNING))
|
|
rw_runlock(&uma_rwlock);
|
|
}
|
|
|
|
/*
|
|
* Count how many pages do we need to bootstrap. VM supplies
|
|
* its need in early zones in the argument, we add up our zones,
|
|
* which consist of: UMA Slabs, UMA Hash and 9 Bucket zones. The
|
|
* zone of zones and zone of kegs are accounted separately.
|
|
*/
|
|
#define UMA_BOOT_ZONES 11
|
|
/* Zone of zones and zone of kegs have arbitrary alignment. */
|
|
#define UMA_BOOT_ALIGN 32
|
|
static int zsize, ksize;
|
|
int
|
|
uma_startup_count(int vm_zones)
|
|
{
|
|
int zones, pages;
|
|
|
|
ksize = sizeof(struct uma_keg) +
|
|
(sizeof(struct uma_domain) * vm_ndomains);
|
|
zsize = sizeof(struct uma_zone) +
|
|
(sizeof(struct uma_cache) * (mp_maxid + 1)) +
|
|
(sizeof(struct uma_zone_domain) * vm_ndomains);
|
|
|
|
/*
|
|
* Memory for the zone of kegs and its keg,
|
|
* and for zone of zones.
|
|
*/
|
|
pages = howmany(roundup(zsize, CACHE_LINE_SIZE) * 2 +
|
|
roundup(ksize, CACHE_LINE_SIZE), PAGE_SIZE);
|
|
|
|
#ifdef UMA_MD_SMALL_ALLOC
|
|
zones = UMA_BOOT_ZONES;
|
|
#else
|
|
zones = UMA_BOOT_ZONES + vm_zones;
|
|
vm_zones = 0;
|
|
#endif
|
|
|
|
/* Memory for the rest of startup zones, UMA and VM, ... */
|
|
if (zsize > UMA_SLAB_SPACE) {
|
|
/* See keg_large_init(). */
|
|
u_int ppera;
|
|
|
|
ppera = howmany(roundup2(zsize, UMA_BOOT_ALIGN), PAGE_SIZE);
|
|
if (PAGE_SIZE * ppera - roundup2(zsize, UMA_BOOT_ALIGN) <
|
|
SIZEOF_UMA_SLAB)
|
|
ppera++;
|
|
pages += (zones + vm_zones) * ppera;
|
|
} else if (roundup2(zsize, UMA_BOOT_ALIGN) > UMA_SLAB_SPACE)
|
|
/* See keg_small_init() special case for uk_ppera = 1. */
|
|
pages += zones;
|
|
else
|
|
pages += howmany(zones,
|
|
UMA_SLAB_SPACE / roundup2(zsize, UMA_BOOT_ALIGN));
|
|
|
|
/* ... and their kegs. Note that zone of zones allocates a keg! */
|
|
pages += howmany(zones + 1,
|
|
UMA_SLAB_SPACE / roundup2(ksize, UMA_BOOT_ALIGN));
|
|
|
|
/*
|
|
* Most of startup zones are not going to be offpages, that's
|
|
* why we use UMA_SLAB_SPACE instead of UMA_SLAB_SIZE in all
|
|
* calculations. Some large bucket zones will be offpage, and
|
|
* thus will allocate hashes. We take conservative approach
|
|
* and assume that all zones may allocate hash. This may give
|
|
* us some positive inaccuracy, usually an extra single page.
|
|
*/
|
|
pages += howmany(zones, UMA_SLAB_SPACE /
|
|
(sizeof(struct slabhead *) * UMA_HASH_SIZE_INIT));
|
|
|
|
return (pages);
|
|
}
|
|
|
|
void
|
|
uma_startup(void *mem, int npages)
|
|
{
|
|
struct uma_zctor_args args;
|
|
uma_keg_t masterkeg;
|
|
uintptr_t m;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
printf("Entering %s with %d boot pages configured\n", __func__, npages);
|
|
#endif
|
|
|
|
rw_init(&uma_rwlock, "UMA lock");
|
|
|
|
/* Use bootpages memory for the zone of zones and zone of kegs. */
|
|
m = (uintptr_t)mem;
|
|
zones = (uma_zone_t)m;
|
|
m += roundup(zsize, CACHE_LINE_SIZE);
|
|
kegs = (uma_zone_t)m;
|
|
m += roundup(zsize, CACHE_LINE_SIZE);
|
|
masterkeg = (uma_keg_t)m;
|
|
m += roundup(ksize, CACHE_LINE_SIZE);
|
|
m = roundup(m, PAGE_SIZE);
|
|
npages -= (m - (uintptr_t)mem) / PAGE_SIZE;
|
|
mem = (void *)m;
|
|
|
|
/* "manually" create the initial zone */
|
|
memset(&args, 0, sizeof(args));
|
|
args.name = "UMA Kegs";
|
|
args.size = ksize;
|
|
args.ctor = keg_ctor;
|
|
args.dtor = keg_dtor;
|
|
args.uminit = zero_init;
|
|
args.fini = NULL;
|
|
args.keg = masterkeg;
|
|
args.align = UMA_BOOT_ALIGN - 1;
|
|
args.flags = UMA_ZFLAG_INTERNAL;
|
|
zone_ctor(kegs, zsize, &args, M_WAITOK);
|
|
|
|
bootmem = mem;
|
|
boot_pages = npages;
|
|
|
|
args.name = "UMA Zones";
|
|
args.size = zsize;
|
|
args.ctor = zone_ctor;
|
|
args.dtor = zone_dtor;
|
|
args.uminit = zero_init;
|
|
args.fini = NULL;
|
|
args.keg = NULL;
|
|
args.align = UMA_BOOT_ALIGN - 1;
|
|
args.flags = UMA_ZFLAG_INTERNAL;
|
|
zone_ctor(zones, zsize, &args, M_WAITOK);
|
|
|
|
/* Now make a zone for slab headers */
|
|
slabzone = uma_zcreate("UMA Slabs",
|
|
sizeof(struct uma_slab),
|
|
NULL, NULL, NULL, NULL,
|
|
UMA_ALIGN_PTR, UMA_ZFLAG_INTERNAL);
|
|
|
|
hashzone = uma_zcreate("UMA Hash",
|
|
sizeof(struct slabhead *) * UMA_HASH_SIZE_INIT,
|
|
NULL, NULL, NULL, NULL,
|
|
UMA_ALIGN_PTR, UMA_ZFLAG_INTERNAL);
|
|
|
|
bucket_init();
|
|
|
|
booted = BOOT_STRAPPED;
|
|
}
|
|
|
|
void
|
|
uma_startup1(void)
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
printf("Entering %s with %d boot pages left\n", __func__, boot_pages);
|
|
#endif
|
|
booted = BOOT_PAGEALLOC;
|
|
}
|
|
|
|
void
|
|
uma_startup2(void)
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
printf("Entering %s with %d boot pages left\n", __func__, boot_pages);
|
|
#endif
|
|
booted = BOOT_BUCKETS;
|
|
sx_init(&uma_drain_lock, "umadrain");
|
|
bucket_enable();
|
|
}
|
|
|
|
/*
|
|
* Initialize our callout handle
|
|
*
|
|
*/
|
|
static void
|
|
uma_startup3(void)
|
|
{
|
|
|
|
#ifdef INVARIANTS
|
|
TUNABLE_INT_FETCH("vm.debug.divisor", &dbg_divisor);
|
|
uma_dbg_cnt = counter_u64_alloc(M_WAITOK);
|
|
uma_skip_cnt = counter_u64_alloc(M_WAITOK);
|
|
#endif
|
|
zone_foreach(zone_alloc_counters);
|
|
callout_init(&uma_callout, 1);
|
|
callout_reset(&uma_callout, UMA_TIMEOUT * hz, uma_timeout, NULL);
|
|
booted = BOOT_RUNNING;
|
|
}
|
|
|
|
static uma_keg_t
|
|
uma_kcreate(uma_zone_t zone, size_t size, uma_init uminit, uma_fini fini,
|
|
int align, uint32_t flags)
|
|
{
|
|
struct uma_kctor_args args;
|
|
|
|
args.size = size;
|
|
args.uminit = uminit;
|
|
args.fini = fini;
|
|
args.align = (align == UMA_ALIGN_CACHE) ? uma_align_cache : align;
|
|
args.flags = flags;
|
|
args.zone = zone;
|
|
return (zone_alloc_item(kegs, &args, UMA_ANYDOMAIN, M_WAITOK));
|
|
}
|
|
|
|
/* Public functions */
|
|
/* See uma.h */
|
|
void
|
|
uma_set_align(int align)
|
|
{
|
|
|
|
if (align != UMA_ALIGN_CACHE)
|
|
uma_align_cache = align;
|
|
}
|
|
|
|
/* See uma.h */
|
|
uma_zone_t
|
|
uma_zcreate(const char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
|
|
uma_init uminit, uma_fini fini, int align, uint32_t flags)
|
|
|
|
{
|
|
struct uma_zctor_args args;
|
|
uma_zone_t res;
|
|
bool locked;
|
|
|
|
KASSERT(powerof2(align + 1), ("invalid zone alignment %d for \"%s\"",
|
|
align, name));
|
|
|
|
/* This stuff is essential for the zone ctor */
|
|
memset(&args, 0, sizeof(args));
|
|
args.name = name;
|
|
args.size = size;
|
|
args.ctor = ctor;
|
|
args.dtor = dtor;
|
|
args.uminit = uminit;
|
|
args.fini = fini;
|
|
#ifdef INVARIANTS
|
|
/*
|
|
* If a zone is being created with an empty constructor and
|
|
* destructor, pass UMA constructor/destructor which checks for
|
|
* memory use after free.
|
|
*/
|
|
if ((!(flags & (UMA_ZONE_ZINIT | UMA_ZONE_NOFREE))) &&
|
|
ctor == NULL && dtor == NULL && uminit == NULL && fini == NULL) {
|
|
args.ctor = trash_ctor;
|
|
args.dtor = trash_dtor;
|
|
args.uminit = trash_init;
|
|
args.fini = trash_fini;
|
|
}
|
|
#endif
|
|
args.align = align;
|
|
args.flags = flags;
|
|
args.keg = NULL;
|
|
|
|
if (booted < BOOT_BUCKETS) {
|
|
locked = false;
|
|
} else {
|
|
sx_slock(&uma_drain_lock);
|
|
locked = true;
|
|
}
|
|
res = zone_alloc_item(zones, &args, UMA_ANYDOMAIN, M_WAITOK);
|
|
if (locked)
|
|
sx_sunlock(&uma_drain_lock);
|
|
return (res);
|
|
}
|
|
|
|
/* See uma.h */
|
|
uma_zone_t
|
|
uma_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor,
|
|
uma_init zinit, uma_fini zfini, uma_zone_t master)
|
|
{
|
|
struct uma_zctor_args args;
|
|
uma_keg_t keg;
|
|
uma_zone_t res;
|
|
bool locked;
|
|
|
|
keg = master->uz_keg;
|
|
memset(&args, 0, sizeof(args));
|
|
args.name = name;
|
|
args.size = keg->uk_size;
|
|
args.ctor = ctor;
|
|
args.dtor = dtor;
|
|
args.uminit = zinit;
|
|
args.fini = zfini;
|
|
args.align = keg->uk_align;
|
|
args.flags = keg->uk_flags | UMA_ZONE_SECONDARY;
|
|
args.keg = keg;
|
|
|
|
if (booted < BOOT_BUCKETS) {
|
|
locked = false;
|
|
} else {
|
|
sx_slock(&uma_drain_lock);
|
|
locked = true;
|
|
}
|
|
/* XXX Attaches only one keg of potentially many. */
|
|
res = zone_alloc_item(zones, &args, UMA_ANYDOMAIN, M_WAITOK);
|
|
if (locked)
|
|
sx_sunlock(&uma_drain_lock);
|
|
return (res);
|
|
}
|
|
|
|
/* See uma.h */
|
|
uma_zone_t
|
|
uma_zcache_create(char *name, int size, uma_ctor ctor, uma_dtor dtor,
|
|
uma_init zinit, uma_fini zfini, uma_import zimport,
|
|
uma_release zrelease, void *arg, int flags)
|
|
{
|
|
struct uma_zctor_args args;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
args.name = name;
|
|
args.size = size;
|
|
args.ctor = ctor;
|
|
args.dtor = dtor;
|
|
args.uminit = zinit;
|
|
args.fini = zfini;
|
|
args.import = zimport;
|
|
args.release = zrelease;
|
|
args.arg = arg;
|
|
args.align = 0;
|
|
args.flags = flags | UMA_ZFLAG_CACHE;
|
|
|
|
return (zone_alloc_item(zones, &args, UMA_ANYDOMAIN, M_WAITOK));
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zdestroy(uma_zone_t zone)
|
|
{
|
|
|
|
sx_slock(&uma_drain_lock);
|
|
zone_free_item(zones, zone, NULL, SKIP_NONE);
|
|
sx_sunlock(&uma_drain_lock);
|
|
}
|
|
|
|
void
|
|
uma_zwait(uma_zone_t zone)
|
|
{
|
|
void *item;
|
|
|
|
item = uma_zalloc_arg(zone, NULL, M_WAITOK);
|
|
uma_zfree(zone, item);
|
|
}
|
|
|
|
void *
|
|
uma_zalloc_pcpu_arg(uma_zone_t zone, void *udata, int flags)
|
|
{
|
|
void *item;
|
|
#ifdef SMP
|
|
int i;
|
|
|
|
MPASS(zone->uz_flags & UMA_ZONE_PCPU);
|
|
#endif
|
|
item = uma_zalloc_arg(zone, udata, flags & ~M_ZERO);
|
|
if (item != NULL && (flags & M_ZERO)) {
|
|
#ifdef SMP
|
|
for (i = 0; i <= mp_maxid; i++)
|
|
bzero(zpcpu_get_cpu(item, i), zone->uz_size);
|
|
#else
|
|
bzero(item, zone->uz_size);
|
|
#endif
|
|
}
|
|
return (item);
|
|
}
|
|
|
|
/*
|
|
* A stub while both regular and pcpu cases are identical.
|
|
*/
|
|
void
|
|
uma_zfree_pcpu_arg(uma_zone_t zone, void *item, void *udata)
|
|
{
|
|
|
|
#ifdef SMP
|
|
MPASS(zone->uz_flags & UMA_ZONE_PCPU);
|
|
#endif
|
|
uma_zfree_arg(zone, item, udata);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void *
|
|
uma_zalloc_arg(uma_zone_t zone, void *udata, int flags)
|
|
{
|
|
uma_zone_domain_t zdom;
|
|
uma_bucket_t bucket;
|
|
uma_cache_t cache;
|
|
void *item;
|
|
int cpu, domain, lockfail, maxbucket;
|
|
#ifdef INVARIANTS
|
|
bool skipdbg;
|
|
#endif
|
|
|
|
/* Enable entropy collection for RANDOM_ENABLE_UMA kernel option */
|
|
random_harvest_fast_uma(&zone, sizeof(zone), RANDOM_UMA);
|
|
|
|
/* This is the fast path allocation */
|
|
CTR4(KTR_UMA, "uma_zalloc_arg thread %x zone %s(%p) flags %d",
|
|
curthread, zone->uz_name, zone, flags);
|
|
|
|
if (flags & M_WAITOK) {
|
|
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
|
|
"uma_zalloc_arg: zone \"%s\"", zone->uz_name);
|
|
}
|
|
KASSERT((flags & M_EXEC) == 0, ("uma_zalloc_arg: called with M_EXEC"));
|
|
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
|
|
("uma_zalloc_arg: called with spinlock or critical section held"));
|
|
if (zone->uz_flags & UMA_ZONE_PCPU)
|
|
KASSERT((flags & M_ZERO) == 0, ("allocating from a pcpu zone "
|
|
"with M_ZERO passed"));
|
|
|
|
#ifdef DEBUG_MEMGUARD
|
|
if (memguard_cmp_zone(zone)) {
|
|
item = memguard_alloc(zone->uz_size, flags);
|
|
if (item != NULL) {
|
|
if (zone->uz_init != NULL &&
|
|
zone->uz_init(item, zone->uz_size, flags) != 0)
|
|
return (NULL);
|
|
if (zone->uz_ctor != NULL &&
|
|
zone->uz_ctor(item, zone->uz_size, udata,
|
|
flags) != 0) {
|
|
zone->uz_fini(item, zone->uz_size);
|
|
return (NULL);
|
|
}
|
|
return (item);
|
|
}
|
|
/* This is unfortunate but should not be fatal. */
|
|
}
|
|
#endif
|
|
/*
|
|
* If possible, allocate from the per-CPU cache. There are two
|
|
* requirements for safe access to the per-CPU cache: (1) the thread
|
|
* accessing the cache must not be preempted or yield during access,
|
|
* and (2) the thread must not migrate CPUs without switching which
|
|
* cache it accesses. We rely on a critical section to prevent
|
|
* preemption and migration. We release the critical section in
|
|
* order to acquire the zone mutex if we are unable to allocate from
|
|
* the current cache; when we re-acquire the critical section, we
|
|
* must detect and handle migration if it has occurred.
|
|
*/
|
|
zalloc_restart:
|
|
critical_enter();
|
|
cpu = curcpu;
|
|
cache = &zone->uz_cpu[cpu];
|
|
|
|
zalloc_start:
|
|
bucket = cache->uc_allocbucket;
|
|
if (bucket != NULL && bucket->ub_cnt > 0) {
|
|
bucket->ub_cnt--;
|
|
item = bucket->ub_bucket[bucket->ub_cnt];
|
|
#ifdef INVARIANTS
|
|
bucket->ub_bucket[bucket->ub_cnt] = NULL;
|
|
#endif
|
|
KASSERT(item != NULL, ("uma_zalloc: Bucket pointer mangled."));
|
|
cache->uc_allocs++;
|
|
critical_exit();
|
|
#ifdef INVARIANTS
|
|
skipdbg = uma_dbg_zskip(zone, item);
|
|
#endif
|
|
if (zone->uz_ctor != NULL &&
|
|
#ifdef INVARIANTS
|
|
(!skipdbg || zone->uz_ctor != trash_ctor ||
|
|
zone->uz_dtor != trash_dtor) &&
|
|
#endif
|
|
zone->uz_ctor(item, zone->uz_size, udata, flags) != 0) {
|
|
counter_u64_add(zone->uz_fails, 1);
|
|
zone_free_item(zone, item, udata, SKIP_DTOR | SKIP_CNT);
|
|
return (NULL);
|
|
}
|
|
#ifdef INVARIANTS
|
|
if (!skipdbg)
|
|
uma_dbg_alloc(zone, NULL, item);
|
|
#endif
|
|
if (flags & M_ZERO)
|
|
uma_zero_item(item, zone);
|
|
return (item);
|
|
}
|
|
|
|
/*
|
|
* We have run out of items in our alloc bucket.
|
|
* See if we can switch with our free bucket.
|
|
*/
|
|
bucket = cache->uc_freebucket;
|
|
if (bucket != NULL && bucket->ub_cnt > 0) {
|
|
CTR2(KTR_UMA,
|
|
"uma_zalloc: zone %s(%p) swapping empty with alloc",
|
|
zone->uz_name, zone);
|
|
cache->uc_freebucket = cache->uc_allocbucket;
|
|
cache->uc_allocbucket = bucket;
|
|
goto zalloc_start;
|
|
}
|
|
|
|
/*
|
|
* Discard any empty allocation bucket while we hold no locks.
|
|
*/
|
|
bucket = cache->uc_allocbucket;
|
|
cache->uc_allocbucket = NULL;
|
|
critical_exit();
|
|
if (bucket != NULL)
|
|
bucket_free(zone, bucket, udata);
|
|
|
|
if (zone->uz_flags & UMA_ZONE_NUMA) {
|
|
domain = PCPU_GET(domain);
|
|
if (VM_DOMAIN_EMPTY(domain))
|
|
domain = UMA_ANYDOMAIN;
|
|
} else
|
|
domain = UMA_ANYDOMAIN;
|
|
|
|
/* Short-circuit for zones without buckets and low memory. */
|
|
if (zone->uz_count == 0 || bucketdisable) {
|
|
ZONE_LOCK(zone);
|
|
goto zalloc_item;
|
|
}
|
|
|
|
/*
|
|
* Attempt to retrieve the item from the per-CPU cache has failed, so
|
|
* we must go back to the zone. This requires the zone lock, so we
|
|
* must drop the critical section, then re-acquire it when we go back
|
|
* to the cache. Since the critical section is released, we may be
|
|
* preempted or migrate. As such, make sure not to maintain any
|
|
* thread-local state specific to the cache from prior to releasing
|
|
* the critical section.
|
|
*/
|
|
lockfail = 0;
|
|
if (ZONE_TRYLOCK(zone) == 0) {
|
|
/* Record contention to size the buckets. */
|
|
ZONE_LOCK(zone);
|
|
lockfail = 1;
|
|
}
|
|
critical_enter();
|
|
cpu = curcpu;
|
|
cache = &zone->uz_cpu[cpu];
|
|
|
|
/* See if we lost the race to fill the cache. */
|
|
if (cache->uc_allocbucket != NULL) {
|
|
ZONE_UNLOCK(zone);
|
|
goto zalloc_start;
|
|
}
|
|
|
|
/*
|
|
* Check the zone's cache of buckets.
|
|
*/
|
|
if (domain == UMA_ANYDOMAIN)
|
|
zdom = &zone->uz_domain[0];
|
|
else
|
|
zdom = &zone->uz_domain[domain];
|
|
if ((bucket = zone_try_fetch_bucket(zone, zdom, true)) != NULL) {
|
|
KASSERT(bucket->ub_cnt != 0,
|
|
("uma_zalloc_arg: Returning an empty bucket."));
|
|
cache->uc_allocbucket = bucket;
|
|
ZONE_UNLOCK(zone);
|
|
goto zalloc_start;
|
|
}
|
|
/* We are no longer associated with this CPU. */
|
|
critical_exit();
|
|
|
|
/*
|
|
* We bump the uz count when the cache size is insufficient to
|
|
* handle the working set.
|
|
*/
|
|
if (lockfail && zone->uz_count < zone->uz_count_max)
|
|
zone->uz_count++;
|
|
|
|
if (zone->uz_max_items > 0) {
|
|
if (zone->uz_items >= zone->uz_max_items)
|
|
goto zalloc_item;
|
|
maxbucket = MIN(zone->uz_count,
|
|
zone->uz_max_items - zone->uz_items);
|
|
zone->uz_items += maxbucket;
|
|
} else
|
|
maxbucket = zone->uz_count;
|
|
ZONE_UNLOCK(zone);
|
|
|
|
/*
|
|
* Now lets just fill a bucket and put it on the free list. If that
|
|
* works we'll restart the allocation from the beginning and it
|
|
* will use the just filled bucket.
|
|
*/
|
|
bucket = zone_alloc_bucket(zone, udata, domain, flags, maxbucket);
|
|
CTR3(KTR_UMA, "uma_zalloc: zone %s(%p) bucket zone returned %p",
|
|
zone->uz_name, zone, bucket);
|
|
ZONE_LOCK(zone);
|
|
if (bucket != NULL) {
|
|
if (zone->uz_max_items > 0 && bucket->ub_cnt < maxbucket) {
|
|
MPASS(zone->uz_items >= maxbucket - bucket->ub_cnt);
|
|
zone->uz_items -= maxbucket - bucket->ub_cnt;
|
|
if (zone->uz_sleepers > 0 &&
|
|
zone->uz_items < zone->uz_max_items)
|
|
wakeup_one(zone);
|
|
}
|
|
critical_enter();
|
|
cpu = curcpu;
|
|
cache = &zone->uz_cpu[cpu];
|
|
|
|
/*
|
|
* See if we lost the race or were migrated. Cache the
|
|
* initialized bucket to make this less likely or claim
|
|
* the memory directly.
|
|
*/
|
|
if (cache->uc_allocbucket == NULL &&
|
|
((zone->uz_flags & UMA_ZONE_NUMA) == 0 ||
|
|
domain == PCPU_GET(domain))) {
|
|
cache->uc_allocbucket = bucket;
|
|
zdom->uzd_imax += bucket->ub_cnt;
|
|
} else if (zone->uz_bkt_count >= zone->uz_bkt_max) {
|
|
critical_exit();
|
|
ZONE_UNLOCK(zone);
|
|
bucket_drain(zone, bucket);
|
|
bucket_free(zone, bucket, udata);
|
|
goto zalloc_restart;
|
|
} else
|
|
zone_put_bucket(zone, zdom, bucket, false);
|
|
ZONE_UNLOCK(zone);
|
|
goto zalloc_start;
|
|
} else if (zone->uz_max_items > 0) {
|
|
zone->uz_items -= maxbucket;
|
|
if (zone->uz_sleepers > 0 &&
|
|
zone->uz_items + 1 < zone->uz_max_items)
|
|
wakeup_one(zone);
|
|
}
|
|
|
|
/*
|
|
* We may not be able to get a bucket so return an actual item.
|
|
*/
|
|
zalloc_item:
|
|
item = zone_alloc_item_locked(zone, udata, domain, flags);
|
|
|
|
return (item);
|
|
}
|
|
|
|
void *
|
|
uma_zalloc_domain(uma_zone_t zone, void *udata, int domain, int flags)
|
|
{
|
|
|
|
/* Enable entropy collection for RANDOM_ENABLE_UMA kernel option */
|
|
random_harvest_fast_uma(&zone, sizeof(zone), RANDOM_UMA);
|
|
|
|
/* This is the fast path allocation */
|
|
CTR5(KTR_UMA,
|
|
"uma_zalloc_domain thread %x zone %s(%p) domain %d flags %d",
|
|
curthread, zone->uz_name, zone, domain, flags);
|
|
|
|
if (flags & M_WAITOK) {
|
|
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
|
|
"uma_zalloc_domain: zone \"%s\"", zone->uz_name);
|
|
}
|
|
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
|
|
("uma_zalloc_domain: called with spinlock or critical section held"));
|
|
|
|
return (zone_alloc_item(zone, udata, domain, flags));
|
|
}
|
|
|
|
/*
|
|
* Find a slab with some space. Prefer slabs that are partially used over those
|
|
* that are totally full. This helps to reduce fragmentation.
|
|
*
|
|
* If 'rr' is 1, search all domains starting from 'domain'. Otherwise check
|
|
* only 'domain'.
|
|
*/
|
|
static uma_slab_t
|
|
keg_first_slab(uma_keg_t keg, int domain, bool rr)
|
|
{
|
|
uma_domain_t dom;
|
|
uma_slab_t slab;
|
|
int start;
|
|
|
|
KASSERT(domain >= 0 && domain < vm_ndomains,
|
|
("keg_first_slab: domain %d out of range", domain));
|
|
KEG_LOCK_ASSERT(keg);
|
|
|
|
slab = NULL;
|
|
start = domain;
|
|
do {
|
|
dom = &keg->uk_domain[domain];
|
|
if (!LIST_EMPTY(&dom->ud_part_slab))
|
|
return (LIST_FIRST(&dom->ud_part_slab));
|
|
if (!LIST_EMPTY(&dom->ud_free_slab)) {
|
|
slab = LIST_FIRST(&dom->ud_free_slab);
|
|
LIST_REMOVE(slab, us_link);
|
|
LIST_INSERT_HEAD(&dom->ud_part_slab, slab, us_link);
|
|
return (slab);
|
|
}
|
|
if (rr)
|
|
domain = (domain + 1) % vm_ndomains;
|
|
} while (domain != start);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
static uma_slab_t
|
|
keg_fetch_free_slab(uma_keg_t keg, int domain, bool rr, int flags)
|
|
{
|
|
uint32_t reserve;
|
|
|
|
KEG_LOCK_ASSERT(keg);
|
|
|
|
reserve = (flags & M_USE_RESERVE) != 0 ? 0 : keg->uk_reserve;
|
|
if (keg->uk_free <= reserve)
|
|
return (NULL);
|
|
return (keg_first_slab(keg, domain, rr));
|
|
}
|
|
|
|
static uma_slab_t
|
|
keg_fetch_slab(uma_keg_t keg, uma_zone_t zone, int rdomain, const int flags)
|
|
{
|
|
struct vm_domainset_iter di;
|
|
uma_domain_t dom;
|
|
uma_slab_t slab;
|
|
int aflags, domain;
|
|
bool rr;
|
|
|
|
restart:
|
|
KEG_LOCK_ASSERT(keg);
|
|
|
|
/*
|
|
* Use the keg's policy if upper layers haven't already specified a
|
|
* domain (as happens with first-touch zones).
|
|
*
|
|
* To avoid races we run the iterator with the keg lock held, but that
|
|
* means that we cannot allow the vm_domainset layer to sleep. Thus,
|
|
* clear M_WAITOK and handle low memory conditions locally.
|
|
*/
|
|
rr = rdomain == UMA_ANYDOMAIN;
|
|
if (rr) {
|
|
aflags = (flags & ~M_WAITOK) | M_NOWAIT;
|
|
vm_domainset_iter_policy_ref_init(&di, &keg->uk_dr, &domain,
|
|
&aflags);
|
|
} else {
|
|
aflags = flags;
|
|
domain = rdomain;
|
|
}
|
|
|
|
for (;;) {
|
|
slab = keg_fetch_free_slab(keg, domain, rr, flags);
|
|
if (slab != NULL) {
|
|
MPASS(slab->us_keg == keg);
|
|
return (slab);
|
|
}
|
|
|
|
/*
|
|
* M_NOVM means don't ask at all!
|
|
*/
|
|
if (flags & M_NOVM)
|
|
break;
|
|
|
|
KASSERT(zone->uz_max_items == 0 ||
|
|
zone->uz_items <= zone->uz_max_items,
|
|
("%s: zone %p overflow", __func__, zone));
|
|
|
|
slab = keg_alloc_slab(keg, zone, domain, flags, aflags);
|
|
/*
|
|
* If we got a slab here it's safe to mark it partially used
|
|
* and return. We assume that the caller is going to remove
|
|
* at least one item.
|
|
*/
|
|
if (slab) {
|
|
MPASS(slab->us_keg == keg);
|
|
dom = &keg->uk_domain[slab->us_domain];
|
|
LIST_INSERT_HEAD(&dom->ud_part_slab, slab, us_link);
|
|
return (slab);
|
|
}
|
|
KEG_LOCK(keg);
|
|
if (rr && vm_domainset_iter_policy(&di, &domain) != 0) {
|
|
if ((flags & M_WAITOK) != 0) {
|
|
KEG_UNLOCK(keg);
|
|
vm_wait_doms(&keg->uk_dr.dr_policy->ds_mask);
|
|
KEG_LOCK(keg);
|
|
goto restart;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We might not have been able to get a slab but another cpu
|
|
* could have while we were unlocked. Check again before we
|
|
* fail.
|
|
*/
|
|
if ((slab = keg_fetch_free_slab(keg, domain, rr, flags)) != NULL) {
|
|
MPASS(slab->us_keg == keg);
|
|
return (slab);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static uma_slab_t
|
|
zone_fetch_slab(uma_zone_t zone, uma_keg_t keg, int domain, int flags)
|
|
{
|
|
uma_slab_t slab;
|
|
|
|
if (keg == NULL) {
|
|
keg = zone->uz_keg;
|
|
KEG_LOCK(keg);
|
|
}
|
|
|
|
for (;;) {
|
|
slab = keg_fetch_slab(keg, zone, domain, flags);
|
|
if (slab)
|
|
return (slab);
|
|
if (flags & (M_NOWAIT | M_NOVM))
|
|
break;
|
|
}
|
|
KEG_UNLOCK(keg);
|
|
return (NULL);
|
|
}
|
|
|
|
static void *
|
|
slab_alloc_item(uma_keg_t keg, uma_slab_t slab)
|
|
{
|
|
uma_domain_t dom;
|
|
void *item;
|
|
uint8_t freei;
|
|
|
|
MPASS(keg == slab->us_keg);
|
|
KEG_LOCK_ASSERT(keg);
|
|
|
|
freei = BIT_FFS(SLAB_SETSIZE, &slab->us_free) - 1;
|
|
BIT_CLR(SLAB_SETSIZE, freei, &slab->us_free);
|
|
item = slab->us_data + (keg->uk_rsize * freei);
|
|
slab->us_freecount--;
|
|
keg->uk_free--;
|
|
|
|
/* Move this slab to the full list */
|
|
if (slab->us_freecount == 0) {
|
|
LIST_REMOVE(slab, us_link);
|
|
dom = &keg->uk_domain[slab->us_domain];
|
|
LIST_INSERT_HEAD(&dom->ud_full_slab, slab, us_link);
|
|
}
|
|
|
|
return (item);
|
|
}
|
|
|
|
static int
|
|
zone_import(uma_zone_t zone, void **bucket, int max, int domain, int flags)
|
|
{
|
|
uma_slab_t slab;
|
|
uma_keg_t keg;
|
|
#ifdef NUMA
|
|
int stripe;
|
|
#endif
|
|
int i;
|
|
|
|
slab = NULL;
|
|
keg = NULL;
|
|
/* Try to keep the buckets totally full */
|
|
for (i = 0; i < max; ) {
|
|
if ((slab = zone_fetch_slab(zone, keg, domain, flags)) == NULL)
|
|
break;
|
|
keg = slab->us_keg;
|
|
#ifdef NUMA
|
|
stripe = howmany(max, vm_ndomains);
|
|
#endif
|
|
while (slab->us_freecount && i < max) {
|
|
bucket[i++] = slab_alloc_item(keg, slab);
|
|
if (keg->uk_free <= keg->uk_reserve)
|
|
break;
|
|
#ifdef NUMA
|
|
/*
|
|
* If the zone is striped we pick a new slab for every
|
|
* N allocations. Eliminating this conditional will
|
|
* instead pick a new domain for each bucket rather
|
|
* than stripe within each bucket. The current option
|
|
* produces more fragmentation and requires more cpu
|
|
* time but yields better distribution.
|
|
*/
|
|
if ((zone->uz_flags & UMA_ZONE_NUMA) == 0 &&
|
|
vm_ndomains > 1 && --stripe == 0)
|
|
break;
|
|
#endif
|
|
}
|
|
/* Don't block if we allocated any successfully. */
|
|
flags &= ~M_WAITOK;
|
|
flags |= M_NOWAIT;
|
|
}
|
|
if (slab != NULL)
|
|
KEG_UNLOCK(keg);
|
|
|
|
return i;
|
|
}
|
|
|
|
static uma_bucket_t
|
|
zone_alloc_bucket(uma_zone_t zone, void *udata, int domain, int flags, int max)
|
|
{
|
|
uma_bucket_t bucket;
|
|
|
|
CTR1(KTR_UMA, "zone_alloc:_bucket domain %d)", domain);
|
|
|
|
/* Don't wait for buckets, preserve caller's NOVM setting. */
|
|
bucket = bucket_alloc(zone, udata, M_NOWAIT | (flags & M_NOVM));
|
|
if (bucket == NULL)
|
|
return (NULL);
|
|
|
|
bucket->ub_cnt = zone->uz_import(zone->uz_arg, bucket->ub_bucket,
|
|
MIN(max, bucket->ub_entries), domain, flags);
|
|
|
|
/*
|
|
* Initialize the memory if necessary.
|
|
*/
|
|
if (bucket->ub_cnt != 0 && zone->uz_init != NULL) {
|
|
int i;
|
|
|
|
for (i = 0; i < bucket->ub_cnt; i++)
|
|
if (zone->uz_init(bucket->ub_bucket[i], zone->uz_size,
|
|
flags) != 0)
|
|
break;
|
|
/*
|
|
* If we couldn't initialize the whole bucket, put the
|
|
* rest back onto the freelist.
|
|
*/
|
|
if (i != bucket->ub_cnt) {
|
|
zone->uz_release(zone->uz_arg, &bucket->ub_bucket[i],
|
|
bucket->ub_cnt - i);
|
|
#ifdef INVARIANTS
|
|
bzero(&bucket->ub_bucket[i],
|
|
sizeof(void *) * (bucket->ub_cnt - i));
|
|
#endif
|
|
bucket->ub_cnt = i;
|
|
}
|
|
}
|
|
|
|
if (bucket->ub_cnt == 0) {
|
|
bucket_free(zone, bucket, udata);
|
|
counter_u64_add(zone->uz_fails, 1);
|
|
return (NULL);
|
|
}
|
|
|
|
return (bucket);
|
|
}
|
|
|
|
/*
|
|
* Allocates a single item from a zone.
|
|
*
|
|
* Arguments
|
|
* zone The zone to alloc for.
|
|
* udata The data to be passed to the constructor.
|
|
* domain The domain to allocate from or UMA_ANYDOMAIN.
|
|
* flags M_WAITOK, M_NOWAIT, M_ZERO.
|
|
*
|
|
* Returns
|
|
* NULL if there is no memory and M_NOWAIT is set
|
|
* An item if successful
|
|
*/
|
|
|
|
static void *
|
|
zone_alloc_item(uma_zone_t zone, void *udata, int domain, int flags)
|
|
{
|
|
|
|
ZONE_LOCK(zone);
|
|
return (zone_alloc_item_locked(zone, udata, domain, flags));
|
|
}
|
|
|
|
/*
|
|
* Returns with zone unlocked.
|
|
*/
|
|
static void *
|
|
zone_alloc_item_locked(uma_zone_t zone, void *udata, int domain, int flags)
|
|
{
|
|
void *item;
|
|
#ifdef INVARIANTS
|
|
bool skipdbg;
|
|
#endif
|
|
|
|
ZONE_LOCK_ASSERT(zone);
|
|
|
|
if (zone->uz_max_items > 0) {
|
|
if (zone->uz_items >= zone->uz_max_items) {
|
|
zone_log_warning(zone);
|
|
zone_maxaction(zone);
|
|
if (flags & M_NOWAIT) {
|
|
ZONE_UNLOCK(zone);
|
|
return (NULL);
|
|
}
|
|
zone->uz_sleeps++;
|
|
zone->uz_sleepers++;
|
|
while (zone->uz_items >= zone->uz_max_items)
|
|
mtx_sleep(zone, zone->uz_lockptr, PVM,
|
|
"zonelimit", 0);
|
|
zone->uz_sleepers--;
|
|
if (zone->uz_sleepers > 0 &&
|
|
zone->uz_items + 1 < zone->uz_max_items)
|
|
wakeup_one(zone);
|
|
}
|
|
zone->uz_items++;
|
|
}
|
|
ZONE_UNLOCK(zone);
|
|
|
|
if (domain != UMA_ANYDOMAIN) {
|
|
/* avoid allocs targeting empty domains */
|
|
if (VM_DOMAIN_EMPTY(domain))
|
|
domain = UMA_ANYDOMAIN;
|
|
}
|
|
if (zone->uz_import(zone->uz_arg, &item, 1, domain, flags) != 1)
|
|
goto fail;
|
|
|
|
#ifdef INVARIANTS
|
|
skipdbg = uma_dbg_zskip(zone, item);
|
|
#endif
|
|
/*
|
|
* We have to call both the zone's init (not the keg's init)
|
|
* and the zone's ctor. This is because the item is going from
|
|
* a keg slab directly to the user, and the user is expecting it
|
|
* to be both zone-init'd as well as zone-ctor'd.
|
|
*/
|
|
if (zone->uz_init != NULL) {
|
|
if (zone->uz_init(item, zone->uz_size, flags) != 0) {
|
|
zone_free_item(zone, item, udata, SKIP_FINI | SKIP_CNT);
|
|
goto fail;
|
|
}
|
|
}
|
|
if (zone->uz_ctor != NULL &&
|
|
#ifdef INVARIANTS
|
|
(!skipdbg || zone->uz_ctor != trash_ctor ||
|
|
zone->uz_dtor != trash_dtor) &&
|
|
#endif
|
|
zone->uz_ctor(item, zone->uz_size, udata, flags) != 0) {
|
|
zone_free_item(zone, item, udata, SKIP_DTOR | SKIP_CNT);
|
|
goto fail;
|
|
}
|
|
#ifdef INVARIANTS
|
|
if (!skipdbg)
|
|
uma_dbg_alloc(zone, NULL, item);
|
|
#endif
|
|
if (flags & M_ZERO)
|
|
uma_zero_item(item, zone);
|
|
|
|
counter_u64_add(zone->uz_allocs, 1);
|
|
CTR3(KTR_UMA, "zone_alloc_item item %p from %s(%p)", item,
|
|
zone->uz_name, zone);
|
|
|
|
return (item);
|
|
|
|
fail:
|
|
if (zone->uz_max_items > 0) {
|
|
ZONE_LOCK(zone);
|
|
zone->uz_items--;
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
counter_u64_add(zone->uz_fails, 1);
|
|
CTR2(KTR_UMA, "zone_alloc_item failed from %s(%p)",
|
|
zone->uz_name, zone);
|
|
return (NULL);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zfree_arg(uma_zone_t zone, void *item, void *udata)
|
|
{
|
|
uma_cache_t cache;
|
|
uma_bucket_t bucket;
|
|
uma_zone_domain_t zdom;
|
|
int cpu, domain;
|
|
bool lockfail;
|
|
#ifdef INVARIANTS
|
|
bool skipdbg;
|
|
#endif
|
|
|
|
/* Enable entropy collection for RANDOM_ENABLE_UMA kernel option */
|
|
random_harvest_fast_uma(&zone, sizeof(zone), RANDOM_UMA);
|
|
|
|
CTR2(KTR_UMA, "uma_zfree_arg thread %x zone %s", curthread,
|
|
zone->uz_name);
|
|
|
|
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
|
|
("uma_zfree_arg: called with spinlock or critical section held"));
|
|
|
|
/* uma_zfree(..., NULL) does nothing, to match free(9). */
|
|
if (item == NULL)
|
|
return;
|
|
#ifdef DEBUG_MEMGUARD
|
|
if (is_memguard_addr(item)) {
|
|
if (zone->uz_dtor != NULL)
|
|
zone->uz_dtor(item, zone->uz_size, udata);
|
|
if (zone->uz_fini != NULL)
|
|
zone->uz_fini(item, zone->uz_size);
|
|
memguard_free(item);
|
|
return;
|
|
}
|
|
#endif
|
|
#ifdef INVARIANTS
|
|
skipdbg = uma_dbg_zskip(zone, item);
|
|
if (skipdbg == false) {
|
|
if (zone->uz_flags & UMA_ZONE_MALLOC)
|
|
uma_dbg_free(zone, udata, item);
|
|
else
|
|
uma_dbg_free(zone, NULL, item);
|
|
}
|
|
if (zone->uz_dtor != NULL && (!skipdbg ||
|
|
zone->uz_dtor != trash_dtor || zone->uz_ctor != trash_ctor))
|
|
#else
|
|
if (zone->uz_dtor != NULL)
|
|
#endif
|
|
zone->uz_dtor(item, zone->uz_size, udata);
|
|
|
|
/*
|
|
* The race here is acceptable. If we miss it we'll just have to wait
|
|
* a little longer for the limits to be reset.
|
|
*/
|
|
if (zone->uz_sleepers > 0)
|
|
goto zfree_item;
|
|
|
|
/*
|
|
* If possible, free to the per-CPU cache. There are two
|
|
* requirements for safe access to the per-CPU cache: (1) the thread
|
|
* accessing the cache must not be preempted or yield during access,
|
|
* and (2) the thread must not migrate CPUs without switching which
|
|
* cache it accesses. We rely on a critical section to prevent
|
|
* preemption and migration. We release the critical section in
|
|
* order to acquire the zone mutex if we are unable to free to the
|
|
* current cache; when we re-acquire the critical section, we must
|
|
* detect and handle migration if it has occurred.
|
|
*/
|
|
zfree_restart:
|
|
critical_enter();
|
|
cpu = curcpu;
|
|
cache = &zone->uz_cpu[cpu];
|
|
|
|
zfree_start:
|
|
/*
|
|
* Try to free into the allocbucket first to give LIFO ordering
|
|
* for cache-hot datastructures. Spill over into the freebucket
|
|
* if necessary. Alloc will swap them if one runs dry.
|
|
*/
|
|
bucket = cache->uc_allocbucket;
|
|
if (bucket == NULL || bucket->ub_cnt >= bucket->ub_entries)
|
|
bucket = cache->uc_freebucket;
|
|
if (bucket != NULL && bucket->ub_cnt < bucket->ub_entries) {
|
|
KASSERT(bucket->ub_bucket[bucket->ub_cnt] == NULL,
|
|
("uma_zfree: Freeing to non free bucket index."));
|
|
bucket->ub_bucket[bucket->ub_cnt] = item;
|
|
bucket->ub_cnt++;
|
|
cache->uc_frees++;
|
|
critical_exit();
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We must go back the zone, which requires acquiring the zone lock,
|
|
* which in turn means we must release and re-acquire the critical
|
|
* section. Since the critical section is released, we may be
|
|
* preempted or migrate. As such, make sure not to maintain any
|
|
* thread-local state specific to the cache from prior to releasing
|
|
* the critical section.
|
|
*/
|
|
critical_exit();
|
|
if (zone->uz_count == 0 || bucketdisable)
|
|
goto zfree_item;
|
|
|
|
lockfail = false;
|
|
if (ZONE_TRYLOCK(zone) == 0) {
|
|
/* Record contention to size the buckets. */
|
|
ZONE_LOCK(zone);
|
|
lockfail = true;
|
|
}
|
|
critical_enter();
|
|
cpu = curcpu;
|
|
cache = &zone->uz_cpu[cpu];
|
|
|
|
bucket = cache->uc_freebucket;
|
|
if (bucket != NULL && bucket->ub_cnt < bucket->ub_entries) {
|
|
ZONE_UNLOCK(zone);
|
|
goto zfree_start;
|
|
}
|
|
cache->uc_freebucket = NULL;
|
|
/* We are no longer associated with this CPU. */
|
|
critical_exit();
|
|
|
|
if ((zone->uz_flags & UMA_ZONE_NUMA) != 0) {
|
|
domain = PCPU_GET(domain);
|
|
if (VM_DOMAIN_EMPTY(domain))
|
|
domain = UMA_ANYDOMAIN;
|
|
} else
|
|
domain = 0;
|
|
zdom = &zone->uz_domain[0];
|
|
|
|
/* Can we throw this on the zone full list? */
|
|
if (bucket != NULL) {
|
|
CTR3(KTR_UMA,
|
|
"uma_zfree: zone %s(%p) putting bucket %p on free list",
|
|
zone->uz_name, zone, bucket);
|
|
/* ub_cnt is pointing to the last free item */
|
|
KASSERT(bucket->ub_cnt == bucket->ub_entries,
|
|
("uma_zfree: Attempting to insert not full bucket onto the full list.\n"));
|
|
if (zone->uz_bkt_count >= zone->uz_bkt_max) {
|
|
ZONE_UNLOCK(zone);
|
|
bucket_drain(zone, bucket);
|
|
bucket_free(zone, bucket, udata);
|
|
goto zfree_restart;
|
|
} else
|
|
zone_put_bucket(zone, zdom, bucket, true);
|
|
}
|
|
|
|
/*
|
|
* We bump the uz count when the cache size is insufficient to
|
|
* handle the working set.
|
|
*/
|
|
if (lockfail && zone->uz_count < zone->uz_count_max)
|
|
zone->uz_count++;
|
|
ZONE_UNLOCK(zone);
|
|
|
|
bucket = bucket_alloc(zone, udata, M_NOWAIT);
|
|
CTR3(KTR_UMA, "uma_zfree: zone %s(%p) allocated bucket %p",
|
|
zone->uz_name, zone, bucket);
|
|
if (bucket) {
|
|
critical_enter();
|
|
cpu = curcpu;
|
|
cache = &zone->uz_cpu[cpu];
|
|
if (cache->uc_freebucket == NULL &&
|
|
((zone->uz_flags & UMA_ZONE_NUMA) == 0 ||
|
|
domain == PCPU_GET(domain))) {
|
|
cache->uc_freebucket = bucket;
|
|
goto zfree_start;
|
|
}
|
|
/*
|
|
* We lost the race, start over. We have to drop our
|
|
* critical section to free the bucket.
|
|
*/
|
|
critical_exit();
|
|
bucket_free(zone, bucket, udata);
|
|
goto zfree_restart;
|
|
}
|
|
|
|
/*
|
|
* If nothing else caught this, we'll just do an internal free.
|
|
*/
|
|
zfree_item:
|
|
zone_free_item(zone, item, udata, SKIP_DTOR);
|
|
}
|
|
|
|
void
|
|
uma_zfree_domain(uma_zone_t zone, void *item, void *udata)
|
|
{
|
|
|
|
/* Enable entropy collection for RANDOM_ENABLE_UMA kernel option */
|
|
random_harvest_fast_uma(&zone, sizeof(zone), RANDOM_UMA);
|
|
|
|
CTR2(KTR_UMA, "uma_zfree_domain thread %x zone %s", curthread,
|
|
zone->uz_name);
|
|
|
|
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
|
|
("uma_zfree_domain: called with spinlock or critical section held"));
|
|
|
|
/* uma_zfree(..., NULL) does nothing, to match free(9). */
|
|
if (item == NULL)
|
|
return;
|
|
zone_free_item(zone, item, udata, SKIP_NONE);
|
|
}
|
|
|
|
static void
|
|
slab_free_item(uma_zone_t zone, uma_slab_t slab, void *item)
|
|
{
|
|
uma_keg_t keg;
|
|
uma_domain_t dom;
|
|
uint8_t freei;
|
|
|
|
keg = zone->uz_keg;
|
|
MPASS(zone->uz_lockptr == &keg->uk_lock);
|
|
KEG_LOCK_ASSERT(keg);
|
|
MPASS(keg == slab->us_keg);
|
|
|
|
dom = &keg->uk_domain[slab->us_domain];
|
|
|
|
/* Do we need to remove from any lists? */
|
|
if (slab->us_freecount+1 == keg->uk_ipers) {
|
|
LIST_REMOVE(slab, us_link);
|
|
LIST_INSERT_HEAD(&dom->ud_free_slab, slab, us_link);
|
|
} else if (slab->us_freecount == 0) {
|
|
LIST_REMOVE(slab, us_link);
|
|
LIST_INSERT_HEAD(&dom->ud_part_slab, slab, us_link);
|
|
}
|
|
|
|
/* Slab management. */
|
|
freei = ((uintptr_t)item - (uintptr_t)slab->us_data) / keg->uk_rsize;
|
|
BIT_SET(SLAB_SETSIZE, freei, &slab->us_free);
|
|
slab->us_freecount++;
|
|
|
|
/* Keg statistics. */
|
|
keg->uk_free++;
|
|
}
|
|
|
|
static void
|
|
zone_release(uma_zone_t zone, void **bucket, int cnt)
|
|
{
|
|
void *item;
|
|
uma_slab_t slab;
|
|
uma_keg_t keg;
|
|
uint8_t *mem;
|
|
int i;
|
|
|
|
keg = zone->uz_keg;
|
|
KEG_LOCK(keg);
|
|
for (i = 0; i < cnt; i++) {
|
|
item = bucket[i];
|
|
if (!(zone->uz_flags & UMA_ZONE_VTOSLAB)) {
|
|
mem = (uint8_t *)((uintptr_t)item & (~UMA_SLAB_MASK));
|
|
if (zone->uz_flags & UMA_ZONE_HASH) {
|
|
slab = hash_sfind(&keg->uk_hash, mem);
|
|
} else {
|
|
mem += keg->uk_pgoff;
|
|
slab = (uma_slab_t)mem;
|
|
}
|
|
} else {
|
|
slab = vtoslab((vm_offset_t)item);
|
|
MPASS(slab->us_keg == keg);
|
|
}
|
|
slab_free_item(zone, slab, item);
|
|
}
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/*
|
|
* Frees a single item to any zone.
|
|
*
|
|
* Arguments:
|
|
* zone The zone to free to
|
|
* item The item we're freeing
|
|
* udata User supplied data for the dtor
|
|
* skip Skip dtors and finis
|
|
*/
|
|
static void
|
|
zone_free_item(uma_zone_t zone, void *item, void *udata, enum zfreeskip skip)
|
|
{
|
|
#ifdef INVARIANTS
|
|
bool skipdbg;
|
|
|
|
skipdbg = uma_dbg_zskip(zone, item);
|
|
if (skip == SKIP_NONE && !skipdbg) {
|
|
if (zone->uz_flags & UMA_ZONE_MALLOC)
|
|
uma_dbg_free(zone, udata, item);
|
|
else
|
|
uma_dbg_free(zone, NULL, item);
|
|
}
|
|
|
|
if (skip < SKIP_DTOR && zone->uz_dtor != NULL &&
|
|
(!skipdbg || zone->uz_dtor != trash_dtor ||
|
|
zone->uz_ctor != trash_ctor))
|
|
#else
|
|
if (skip < SKIP_DTOR && zone->uz_dtor != NULL)
|
|
#endif
|
|
zone->uz_dtor(item, zone->uz_size, udata);
|
|
|
|
if (skip < SKIP_FINI && zone->uz_fini)
|
|
zone->uz_fini(item, zone->uz_size);
|
|
|
|
zone->uz_release(zone->uz_arg, &item, 1);
|
|
|
|
if (skip & SKIP_CNT)
|
|
return;
|
|
|
|
counter_u64_add(zone->uz_frees, 1);
|
|
|
|
if (zone->uz_max_items > 0) {
|
|
ZONE_LOCK(zone);
|
|
zone->uz_items--;
|
|
if (zone->uz_sleepers > 0 &&
|
|
zone->uz_items < zone->uz_max_items)
|
|
wakeup_one(zone);
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
}
|
|
|
|
/* See uma.h */
|
|
int
|
|
uma_zone_set_max(uma_zone_t zone, int nitems)
|
|
{
|
|
struct uma_bucket_zone *ubz;
|
|
|
|
/*
|
|
* If limit is very low we may need to limit how
|
|
* much items are allowed in CPU caches.
|
|
*/
|
|
ubz = &bucket_zones[0];
|
|
for (; ubz->ubz_entries != 0; ubz++)
|
|
if (ubz->ubz_entries * 2 * mp_ncpus > nitems)
|
|
break;
|
|
if (ubz == &bucket_zones[0])
|
|
nitems = ubz->ubz_entries * 2 * mp_ncpus;
|
|
else
|
|
ubz--;
|
|
|
|
ZONE_LOCK(zone);
|
|
zone->uz_count_max = zone->uz_count = ubz->ubz_entries;
|
|
if (zone->uz_count_min > zone->uz_count_max)
|
|
zone->uz_count_min = zone->uz_count_max;
|
|
zone->uz_max_items = nitems;
|
|
ZONE_UNLOCK(zone);
|
|
|
|
return (nitems);
|
|
}
|
|
|
|
/* See uma.h */
|
|
int
|
|
uma_zone_set_maxcache(uma_zone_t zone, int nitems)
|
|
{
|
|
|
|
ZONE_LOCK(zone);
|
|
zone->uz_bkt_max = nitems;
|
|
ZONE_UNLOCK(zone);
|
|
|
|
return (nitems);
|
|
}
|
|
|
|
/* See uma.h */
|
|
int
|
|
uma_zone_get_max(uma_zone_t zone)
|
|
{
|
|
int nitems;
|
|
|
|
ZONE_LOCK(zone);
|
|
nitems = zone->uz_max_items;
|
|
ZONE_UNLOCK(zone);
|
|
|
|
return (nitems);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zone_set_warning(uma_zone_t zone, const char *warning)
|
|
{
|
|
|
|
ZONE_LOCK(zone);
|
|
zone->uz_warning = warning;
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zone_set_maxaction(uma_zone_t zone, uma_maxaction_t maxaction)
|
|
{
|
|
|
|
ZONE_LOCK(zone);
|
|
TASK_INIT(&zone->uz_maxaction, 0, (task_fn_t *)maxaction, zone);
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
/* See uma.h */
|
|
int
|
|
uma_zone_get_cur(uma_zone_t zone)
|
|
{
|
|
int64_t nitems;
|
|
u_int i;
|
|
|
|
ZONE_LOCK(zone);
|
|
nitems = counter_u64_fetch(zone->uz_allocs) -
|
|
counter_u64_fetch(zone->uz_frees);
|
|
CPU_FOREACH(i) {
|
|
/*
|
|
* See the comment in uma_vm_zone_stats() regarding the
|
|
* safety of accessing the per-cpu caches. With the zone lock
|
|
* held, it is safe, but can potentially result in stale data.
|
|
*/
|
|
nitems += zone->uz_cpu[i].uc_allocs -
|
|
zone->uz_cpu[i].uc_frees;
|
|
}
|
|
ZONE_UNLOCK(zone);
|
|
|
|
return (nitems < 0 ? 0 : nitems);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zone_set_init(uma_zone_t zone, uma_init uminit)
|
|
{
|
|
uma_keg_t keg;
|
|
|
|
KEG_GET(zone, keg);
|
|
KEG_LOCK(keg);
|
|
KASSERT(keg->uk_pages == 0,
|
|
("uma_zone_set_init on non-empty keg"));
|
|
keg->uk_init = uminit;
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zone_set_fini(uma_zone_t zone, uma_fini fini)
|
|
{
|
|
uma_keg_t keg;
|
|
|
|
KEG_GET(zone, keg);
|
|
KEG_LOCK(keg);
|
|
KASSERT(keg->uk_pages == 0,
|
|
("uma_zone_set_fini on non-empty keg"));
|
|
keg->uk_fini = fini;
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zone_set_zinit(uma_zone_t zone, uma_init zinit)
|
|
{
|
|
|
|
ZONE_LOCK(zone);
|
|
KASSERT(zone->uz_keg->uk_pages == 0,
|
|
("uma_zone_set_zinit on non-empty keg"));
|
|
zone->uz_init = zinit;
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini)
|
|
{
|
|
|
|
ZONE_LOCK(zone);
|
|
KASSERT(zone->uz_keg->uk_pages == 0,
|
|
("uma_zone_set_zfini on non-empty keg"));
|
|
zone->uz_fini = zfini;
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
/* See uma.h */
|
|
/* XXX uk_freef is not actually used with the zone locked */
|
|
void
|
|
uma_zone_set_freef(uma_zone_t zone, uma_free freef)
|
|
{
|
|
uma_keg_t keg;
|
|
|
|
KEG_GET(zone, keg);
|
|
KASSERT(keg != NULL, ("uma_zone_set_freef: Invalid zone type"));
|
|
KEG_LOCK(keg);
|
|
keg->uk_freef = freef;
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/* See uma.h */
|
|
/* XXX uk_allocf is not actually used with the zone locked */
|
|
void
|
|
uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf)
|
|
{
|
|
uma_keg_t keg;
|
|
|
|
KEG_GET(zone, keg);
|
|
KEG_LOCK(keg);
|
|
keg->uk_allocf = allocf;
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_zone_reserve(uma_zone_t zone, int items)
|
|
{
|
|
uma_keg_t keg;
|
|
|
|
KEG_GET(zone, keg);
|
|
KEG_LOCK(keg);
|
|
keg->uk_reserve = items;
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/* See uma.h */
|
|
int
|
|
uma_zone_reserve_kva(uma_zone_t zone, int count)
|
|
{
|
|
uma_keg_t keg;
|
|
vm_offset_t kva;
|
|
u_int pages;
|
|
|
|
KEG_GET(zone, keg);
|
|
|
|
pages = count / keg->uk_ipers;
|
|
if (pages * keg->uk_ipers < count)
|
|
pages++;
|
|
pages *= keg->uk_ppera;
|
|
|
|
#ifdef UMA_MD_SMALL_ALLOC
|
|
if (keg->uk_ppera > 1) {
|
|
#else
|
|
if (1) {
|
|
#endif
|
|
kva = kva_alloc((vm_size_t)pages * PAGE_SIZE);
|
|
if (kva == 0)
|
|
return (0);
|
|
} else
|
|
kva = 0;
|
|
|
|
ZONE_LOCK(zone);
|
|
MPASS(keg->uk_kva == 0);
|
|
keg->uk_kva = kva;
|
|
keg->uk_offset = 0;
|
|
zone->uz_max_items = pages * keg->uk_ipers;
|
|
#ifdef UMA_MD_SMALL_ALLOC
|
|
keg->uk_allocf = (keg->uk_ppera > 1) ? noobj_alloc : uma_small_alloc;
|
|
#else
|
|
keg->uk_allocf = noobj_alloc;
|
|
#endif
|
|
keg->uk_flags |= UMA_ZONE_NOFREE;
|
|
ZONE_UNLOCK(zone);
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* See uma.h */
|
|
void
|
|
uma_prealloc(uma_zone_t zone, int items)
|
|
{
|
|
struct vm_domainset_iter di;
|
|
uma_domain_t dom;
|
|
uma_slab_t slab;
|
|
uma_keg_t keg;
|
|
int aflags, domain, slabs;
|
|
|
|
KEG_GET(zone, keg);
|
|
KEG_LOCK(keg);
|
|
slabs = items / keg->uk_ipers;
|
|
if (slabs * keg->uk_ipers < items)
|
|
slabs++;
|
|
while (slabs-- > 0) {
|
|
aflags = M_NOWAIT;
|
|
vm_domainset_iter_policy_ref_init(&di, &keg->uk_dr, &domain,
|
|
&aflags);
|
|
for (;;) {
|
|
slab = keg_alloc_slab(keg, zone, domain, M_WAITOK,
|
|
aflags);
|
|
if (slab != NULL) {
|
|
MPASS(slab->us_keg == keg);
|
|
dom = &keg->uk_domain[slab->us_domain];
|
|
LIST_INSERT_HEAD(&dom->ud_free_slab, slab,
|
|
us_link);
|
|
break;
|
|
}
|
|
KEG_LOCK(keg);
|
|
if (vm_domainset_iter_policy(&di, &domain) != 0) {
|
|
KEG_UNLOCK(keg);
|
|
vm_wait_doms(&keg->uk_dr.dr_policy->ds_mask);
|
|
KEG_LOCK(keg);
|
|
}
|
|
}
|
|
}
|
|
KEG_UNLOCK(keg);
|
|
}
|
|
|
|
/* See uma.h */
|
|
static void
|
|
uma_reclaim_locked(bool kmem_danger)
|
|
{
|
|
|
|
CTR0(KTR_UMA, "UMA: vm asked us to release pages!");
|
|
sx_assert(&uma_drain_lock, SA_XLOCKED);
|
|
bucket_enable();
|
|
zone_foreach(zone_drain);
|
|
if (vm_page_count_min() || kmem_danger) {
|
|
cache_drain_safe(NULL);
|
|
zone_foreach(zone_drain);
|
|
}
|
|
|
|
/*
|
|
* Some slabs may have been freed but this zone will be visited early
|
|
* we visit again so that we can free pages that are empty once other
|
|
* zones are drained. We have to do the same for buckets.
|
|
*/
|
|
zone_drain(slabzone);
|
|
bucket_zone_drain();
|
|
}
|
|
|
|
void
|
|
uma_reclaim(void)
|
|
{
|
|
|
|
sx_xlock(&uma_drain_lock);
|
|
uma_reclaim_locked(false);
|
|
sx_xunlock(&uma_drain_lock);
|
|
}
|
|
|
|
static volatile int uma_reclaim_needed;
|
|
|
|
void
|
|
uma_reclaim_wakeup(void)
|
|
{
|
|
|
|
if (atomic_fetchadd_int(&uma_reclaim_needed, 1) == 0)
|
|
wakeup(uma_reclaim);
|
|
}
|
|
|
|
void
|
|
uma_reclaim_worker(void *arg __unused)
|
|
{
|
|
|
|
for (;;) {
|
|
sx_xlock(&uma_drain_lock);
|
|
while (atomic_load_int(&uma_reclaim_needed) == 0)
|
|
sx_sleep(uma_reclaim, &uma_drain_lock, PVM, "umarcl",
|
|
hz);
|
|
sx_xunlock(&uma_drain_lock);
|
|
EVENTHANDLER_INVOKE(vm_lowmem, VM_LOW_KMEM);
|
|
sx_xlock(&uma_drain_lock);
|
|
uma_reclaim_locked(true);
|
|
atomic_store_int(&uma_reclaim_needed, 0);
|
|
sx_xunlock(&uma_drain_lock);
|
|
/* Don't fire more than once per-second. */
|
|
pause("umarclslp", hz);
|
|
}
|
|
}
|
|
|
|
/* See uma.h */
|
|
int
|
|
uma_zone_exhausted(uma_zone_t zone)
|
|
{
|
|
int full;
|
|
|
|
ZONE_LOCK(zone);
|
|
full = zone->uz_sleepers > 0;
|
|
ZONE_UNLOCK(zone);
|
|
return (full);
|
|
}
|
|
|
|
int
|
|
uma_zone_exhausted_nolock(uma_zone_t zone)
|
|
{
|
|
return (zone->uz_sleepers > 0);
|
|
}
|
|
|
|
void *
|
|
uma_large_malloc_domain(vm_size_t size, int domain, int wait)
|
|
{
|
|
struct domainset *policy;
|
|
vm_offset_t addr;
|
|
uma_slab_t slab;
|
|
|
|
if (domain != UMA_ANYDOMAIN) {
|
|
/* avoid allocs targeting empty domains */
|
|
if (VM_DOMAIN_EMPTY(domain))
|
|
domain = UMA_ANYDOMAIN;
|
|
}
|
|
slab = zone_alloc_item(slabzone, NULL, domain, wait);
|
|
if (slab == NULL)
|
|
return (NULL);
|
|
policy = (domain == UMA_ANYDOMAIN) ? DOMAINSET_RR() :
|
|
DOMAINSET_FIXED(domain);
|
|
addr = kmem_malloc_domainset(policy, size, wait);
|
|
if (addr != 0) {
|
|
vsetslab(addr, slab);
|
|
slab->us_data = (void *)addr;
|
|
slab->us_flags = UMA_SLAB_KERNEL | UMA_SLAB_MALLOC;
|
|
slab->us_size = size;
|
|
slab->us_domain = vm_phys_domain(PHYS_TO_VM_PAGE(
|
|
pmap_kextract(addr)));
|
|
uma_total_inc(size);
|
|
} else {
|
|
zone_free_item(slabzone, slab, NULL, SKIP_NONE);
|
|
}
|
|
|
|
return ((void *)addr);
|
|
}
|
|
|
|
void *
|
|
uma_large_malloc(vm_size_t size, int wait)
|
|
{
|
|
|
|
return uma_large_malloc_domain(size, UMA_ANYDOMAIN, wait);
|
|
}
|
|
|
|
void
|
|
uma_large_free(uma_slab_t slab)
|
|
{
|
|
|
|
KASSERT((slab->us_flags & UMA_SLAB_KERNEL) != 0,
|
|
("uma_large_free: Memory not allocated with uma_large_malloc."));
|
|
kmem_free((vm_offset_t)slab->us_data, slab->us_size);
|
|
uma_total_dec(slab->us_size);
|
|
zone_free_item(slabzone, slab, NULL, SKIP_NONE);
|
|
}
|
|
|
|
static void
|
|
uma_zero_item(void *item, uma_zone_t zone)
|
|
{
|
|
|
|
bzero(item, zone->uz_size);
|
|
}
|
|
|
|
unsigned long
|
|
uma_limit(void)
|
|
{
|
|
|
|
return (uma_kmem_limit);
|
|
}
|
|
|
|
void
|
|
uma_set_limit(unsigned long limit)
|
|
{
|
|
|
|
uma_kmem_limit = limit;
|
|
}
|
|
|
|
unsigned long
|
|
uma_size(void)
|
|
{
|
|
|
|
return (atomic_load_long(&uma_kmem_total));
|
|
}
|
|
|
|
long
|
|
uma_avail(void)
|
|
{
|
|
|
|
return (uma_kmem_limit - uma_size());
|
|
}
|
|
|
|
void
|
|
uma_print_stats(void)
|
|
{
|
|
zone_foreach(uma_print_zone);
|
|
}
|
|
|
|
static void
|
|
slab_print(uma_slab_t slab)
|
|
{
|
|
printf("slab: keg %p, data %p, freecount %d\n",
|
|
slab->us_keg, slab->us_data, slab->us_freecount);
|
|
}
|
|
|
|
static void
|
|
cache_print(uma_cache_t cache)
|
|
{
|
|
printf("alloc: %p(%d), free: %p(%d)\n",
|
|
cache->uc_allocbucket,
|
|
cache->uc_allocbucket?cache->uc_allocbucket->ub_cnt:0,
|
|
cache->uc_freebucket,
|
|
cache->uc_freebucket?cache->uc_freebucket->ub_cnt:0);
|
|
}
|
|
|
|
static void
|
|
uma_print_keg(uma_keg_t keg)
|
|
{
|
|
uma_domain_t dom;
|
|
uma_slab_t slab;
|
|
int i;
|
|
|
|
printf("keg: %s(%p) size %d(%d) flags %#x ipers %d ppera %d "
|
|
"out %d free %d\n",
|
|
keg->uk_name, keg, keg->uk_size, keg->uk_rsize, keg->uk_flags,
|
|
keg->uk_ipers, keg->uk_ppera,
|
|
(keg->uk_pages / keg->uk_ppera) * keg->uk_ipers - keg->uk_free,
|
|
keg->uk_free);
|
|
for (i = 0; i < vm_ndomains; i++) {
|
|
dom = &keg->uk_domain[i];
|
|
printf("Part slabs:\n");
|
|
LIST_FOREACH(slab, &dom->ud_part_slab, us_link)
|
|
slab_print(slab);
|
|
printf("Free slabs:\n");
|
|
LIST_FOREACH(slab, &dom->ud_free_slab, us_link)
|
|
slab_print(slab);
|
|
printf("Full slabs:\n");
|
|
LIST_FOREACH(slab, &dom->ud_full_slab, us_link)
|
|
slab_print(slab);
|
|
}
|
|
}
|
|
|
|
void
|
|
uma_print_zone(uma_zone_t zone)
|
|
{
|
|
uma_cache_t cache;
|
|
int i;
|
|
|
|
printf("zone: %s(%p) size %d maxitems %ju flags %#x\n",
|
|
zone->uz_name, zone, zone->uz_size, (uintmax_t)zone->uz_max_items,
|
|
zone->uz_flags);
|
|
if (zone->uz_lockptr != &zone->uz_lock)
|
|
uma_print_keg(zone->uz_keg);
|
|
CPU_FOREACH(i) {
|
|
cache = &zone->uz_cpu[i];
|
|
printf("CPU %d Cache:\n", i);
|
|
cache_print(cache);
|
|
}
|
|
}
|
|
|
|
#ifdef DDB
|
|
/*
|
|
* Generate statistics across both the zone and its per-cpu cache's. Return
|
|
* desired statistics if the pointer is non-NULL for that statistic.
|
|
*
|
|
* Note: does not update the zone statistics, as it can't safely clear the
|
|
* per-CPU cache statistic.
|
|
*
|
|
* XXXRW: Following the uc_allocbucket and uc_freebucket pointers here isn't
|
|
* safe from off-CPU; we should modify the caches to track this information
|
|
* directly so that we don't have to.
|
|
*/
|
|
static void
|
|
uma_zone_sumstat(uma_zone_t z, long *cachefreep, uint64_t *allocsp,
|
|
uint64_t *freesp, uint64_t *sleepsp)
|
|
{
|
|
uma_cache_t cache;
|
|
uint64_t allocs, frees, sleeps;
|
|
int cachefree, cpu;
|
|
|
|
allocs = frees = sleeps = 0;
|
|
cachefree = 0;
|
|
CPU_FOREACH(cpu) {
|
|
cache = &z->uz_cpu[cpu];
|
|
if (cache->uc_allocbucket != NULL)
|
|
cachefree += cache->uc_allocbucket->ub_cnt;
|
|
if (cache->uc_freebucket != NULL)
|
|
cachefree += cache->uc_freebucket->ub_cnt;
|
|
allocs += cache->uc_allocs;
|
|
frees += cache->uc_frees;
|
|
}
|
|
allocs += counter_u64_fetch(z->uz_allocs);
|
|
frees += counter_u64_fetch(z->uz_frees);
|
|
sleeps += z->uz_sleeps;
|
|
if (cachefreep != NULL)
|
|
*cachefreep = cachefree;
|
|
if (allocsp != NULL)
|
|
*allocsp = allocs;
|
|
if (freesp != NULL)
|
|
*freesp = frees;
|
|
if (sleepsp != NULL)
|
|
*sleepsp = sleeps;
|
|
}
|
|
#endif /* DDB */
|
|
|
|
static int
|
|
sysctl_vm_zone_count(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
uma_keg_t kz;
|
|
uma_zone_t z;
|
|
int count;
|
|
|
|
count = 0;
|
|
rw_rlock(&uma_rwlock);
|
|
LIST_FOREACH(kz, &uma_kegs, uk_link) {
|
|
LIST_FOREACH(z, &kz->uk_zones, uz_link)
|
|
count++;
|
|
}
|
|
LIST_FOREACH(z, &uma_cachezones, uz_link)
|
|
count++;
|
|
|
|
rw_runlock(&uma_rwlock);
|
|
return (sysctl_handle_int(oidp, &count, 0, req));
|
|
}
|
|
|
|
static void
|
|
uma_vm_zone_stats(struct uma_type_header *uth, uma_zone_t z, struct sbuf *sbuf,
|
|
struct uma_percpu_stat *ups, bool internal)
|
|
{
|
|
uma_zone_domain_t zdom;
|
|
uma_cache_t cache;
|
|
int i;
|
|
|
|
|
|
for (i = 0; i < vm_ndomains; i++) {
|
|
zdom = &z->uz_domain[i];
|
|
uth->uth_zone_free += zdom->uzd_nitems;
|
|
}
|
|
uth->uth_allocs = counter_u64_fetch(z->uz_allocs);
|
|
uth->uth_frees = counter_u64_fetch(z->uz_frees);
|
|
uth->uth_fails = counter_u64_fetch(z->uz_fails);
|
|
uth->uth_sleeps = z->uz_sleeps;
|
|
/*
|
|
* While it is not normally safe to access the cache
|
|
* bucket pointers while not on the CPU that owns the
|
|
* cache, we only allow the pointers to be exchanged
|
|
* without the zone lock held, not invalidated, so
|
|
* accept the possible race associated with bucket
|
|
* exchange during monitoring.
|
|
*/
|
|
for (i = 0; i < mp_maxid + 1; i++) {
|
|
bzero(&ups[i], sizeof(*ups));
|
|
if (internal || CPU_ABSENT(i))
|
|
continue;
|
|
cache = &z->uz_cpu[i];
|
|
if (cache->uc_allocbucket != NULL)
|
|
ups[i].ups_cache_free +=
|
|
cache->uc_allocbucket->ub_cnt;
|
|
if (cache->uc_freebucket != NULL)
|
|
ups[i].ups_cache_free +=
|
|
cache->uc_freebucket->ub_cnt;
|
|
ups[i].ups_allocs = cache->uc_allocs;
|
|
ups[i].ups_frees = cache->uc_frees;
|
|
}
|
|
}
|
|
|
|
static int
|
|
sysctl_vm_zone_stats(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct uma_stream_header ush;
|
|
struct uma_type_header uth;
|
|
struct uma_percpu_stat *ups;
|
|
struct sbuf sbuf;
|
|
uma_keg_t kz;
|
|
uma_zone_t z;
|
|
int count, error, i;
|
|
|
|
error = sysctl_wire_old_buffer(req, 0);
|
|
if (error != 0)
|
|
return (error);
|
|
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
|
|
sbuf_clear_flags(&sbuf, SBUF_INCLUDENUL);
|
|
ups = malloc((mp_maxid + 1) * sizeof(*ups), M_TEMP, M_WAITOK);
|
|
|
|
count = 0;
|
|
rw_rlock(&uma_rwlock);
|
|
LIST_FOREACH(kz, &uma_kegs, uk_link) {
|
|
LIST_FOREACH(z, &kz->uk_zones, uz_link)
|
|
count++;
|
|
}
|
|
|
|
LIST_FOREACH(z, &uma_cachezones, uz_link)
|
|
count++;
|
|
|
|
/*
|
|
* Insert stream header.
|
|
*/
|
|
bzero(&ush, sizeof(ush));
|
|
ush.ush_version = UMA_STREAM_VERSION;
|
|
ush.ush_maxcpus = (mp_maxid + 1);
|
|
ush.ush_count = count;
|
|
(void)sbuf_bcat(&sbuf, &ush, sizeof(ush));
|
|
|
|
LIST_FOREACH(kz, &uma_kegs, uk_link) {
|
|
LIST_FOREACH(z, &kz->uk_zones, uz_link) {
|
|
bzero(&uth, sizeof(uth));
|
|
ZONE_LOCK(z);
|
|
strlcpy(uth.uth_name, z->uz_name, UTH_MAX_NAME);
|
|
uth.uth_align = kz->uk_align;
|
|
uth.uth_size = kz->uk_size;
|
|
uth.uth_rsize = kz->uk_rsize;
|
|
if (z->uz_max_items > 0)
|
|
uth.uth_pages = (z->uz_items / kz->uk_ipers) *
|
|
kz->uk_ppera;
|
|
else
|
|
uth.uth_pages = kz->uk_pages;
|
|
uth.uth_maxpages = (z->uz_max_items / kz->uk_ipers) *
|
|
kz->uk_ppera;
|
|
uth.uth_limit = z->uz_max_items;
|
|
uth.uth_keg_free = z->uz_keg->uk_free;
|
|
|
|
/*
|
|
* A zone is secondary is it is not the first entry
|
|
* on the keg's zone list.
|
|
*/
|
|
if ((z->uz_flags & UMA_ZONE_SECONDARY) &&
|
|
(LIST_FIRST(&kz->uk_zones) != z))
|
|
uth.uth_zone_flags = UTH_ZONE_SECONDARY;
|
|
uma_vm_zone_stats(&uth, z, &sbuf, ups,
|
|
kz->uk_flags & UMA_ZFLAG_INTERNAL);
|
|
ZONE_UNLOCK(z);
|
|
(void)sbuf_bcat(&sbuf, &uth, sizeof(uth));
|
|
for (i = 0; i < mp_maxid + 1; i++)
|
|
(void)sbuf_bcat(&sbuf, &ups[i], sizeof(ups[i]));
|
|
}
|
|
}
|
|
LIST_FOREACH(z, &uma_cachezones, uz_link) {
|
|
bzero(&uth, sizeof(uth));
|
|
ZONE_LOCK(z);
|
|
strlcpy(uth.uth_name, z->uz_name, UTH_MAX_NAME);
|
|
uth.uth_size = z->uz_size;
|
|
uma_vm_zone_stats(&uth, z, &sbuf, ups, false);
|
|
ZONE_UNLOCK(z);
|
|
(void)sbuf_bcat(&sbuf, &uth, sizeof(uth));
|
|
for (i = 0; i < mp_maxid + 1; i++)
|
|
(void)sbuf_bcat(&sbuf, &ups[i], sizeof(ups[i]));
|
|
}
|
|
|
|
rw_runlock(&uma_rwlock);
|
|
error = sbuf_finish(&sbuf);
|
|
sbuf_delete(&sbuf);
|
|
free(ups, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sysctl_handle_uma_zone_max(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
uma_zone_t zone = *(uma_zone_t *)arg1;
|
|
int error, max;
|
|
|
|
max = uma_zone_get_max(zone);
|
|
error = sysctl_handle_int(oidp, &max, 0, req);
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
uma_zone_set_max(zone, max);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
uma_zone_t zone = *(uma_zone_t *)arg1;
|
|
int cur;
|
|
|
|
cur = uma_zone_get_cur(zone);
|
|
return (sysctl_handle_int(oidp, &cur, 0, req));
|
|
}
|
|
|
|
#ifdef INVARIANTS
|
|
static uma_slab_t
|
|
uma_dbg_getslab(uma_zone_t zone, void *item)
|
|
{
|
|
uma_slab_t slab;
|
|
uma_keg_t keg;
|
|
uint8_t *mem;
|
|
|
|
mem = (uint8_t *)((uintptr_t)item & (~UMA_SLAB_MASK));
|
|
if (zone->uz_flags & UMA_ZONE_VTOSLAB) {
|
|
slab = vtoslab((vm_offset_t)mem);
|
|
} else {
|
|
/*
|
|
* It is safe to return the slab here even though the
|
|
* zone is unlocked because the item's allocation state
|
|
* essentially holds a reference.
|
|
*/
|
|
if (zone->uz_lockptr == &zone->uz_lock)
|
|
return (NULL);
|
|
ZONE_LOCK(zone);
|
|
keg = zone->uz_keg;
|
|
if (keg->uk_flags & UMA_ZONE_HASH)
|
|
slab = hash_sfind(&keg->uk_hash, mem);
|
|
else
|
|
slab = (uma_slab_t)(mem + keg->uk_pgoff);
|
|
ZONE_UNLOCK(zone);
|
|
}
|
|
|
|
return (slab);
|
|
}
|
|
|
|
static bool
|
|
uma_dbg_zskip(uma_zone_t zone, void *mem)
|
|
{
|
|
|
|
if (zone->uz_lockptr == &zone->uz_lock)
|
|
return (true);
|
|
|
|
return (uma_dbg_kskip(zone->uz_keg, mem));
|
|
}
|
|
|
|
static bool
|
|
uma_dbg_kskip(uma_keg_t keg, void *mem)
|
|
{
|
|
uintptr_t idx;
|
|
|
|
if (dbg_divisor == 0)
|
|
return (true);
|
|
|
|
if (dbg_divisor == 1)
|
|
return (false);
|
|
|
|
idx = (uintptr_t)mem >> PAGE_SHIFT;
|
|
if (keg->uk_ipers > 1) {
|
|
idx *= keg->uk_ipers;
|
|
idx += ((uintptr_t)mem & PAGE_MASK) / keg->uk_rsize;
|
|
}
|
|
|
|
if ((idx / dbg_divisor) * dbg_divisor != idx) {
|
|
counter_u64_add(uma_skip_cnt, 1);
|
|
return (true);
|
|
}
|
|
counter_u64_add(uma_dbg_cnt, 1);
|
|
|
|
return (false);
|
|
}
|
|
|
|
/*
|
|
* Set up the slab's freei data such that uma_dbg_free can function.
|
|
*
|
|
*/
|
|
static void
|
|
uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item)
|
|
{
|
|
uma_keg_t keg;
|
|
int freei;
|
|
|
|
if (slab == NULL) {
|
|
slab = uma_dbg_getslab(zone, item);
|
|
if (slab == NULL)
|
|
panic("uma: item %p did not belong to zone %s\n",
|
|
item, zone->uz_name);
|
|
}
|
|
keg = slab->us_keg;
|
|
freei = ((uintptr_t)item - (uintptr_t)slab->us_data) / keg->uk_rsize;
|
|
|
|
if (BIT_ISSET(SLAB_SETSIZE, freei, &slab->us_debugfree))
|
|
panic("Duplicate alloc of %p from zone %p(%s) slab %p(%d)\n",
|
|
item, zone, zone->uz_name, slab, freei);
|
|
BIT_SET_ATOMIC(SLAB_SETSIZE, freei, &slab->us_debugfree);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Verifies freed addresses. Checks for alignment, valid slab membership
|
|
* and duplicate frees.
|
|
*
|
|
*/
|
|
static void
|
|
uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item)
|
|
{
|
|
uma_keg_t keg;
|
|
int freei;
|
|
|
|
if (slab == NULL) {
|
|
slab = uma_dbg_getslab(zone, item);
|
|
if (slab == NULL)
|
|
panic("uma: Freed item %p did not belong to zone %s\n",
|
|
item, zone->uz_name);
|
|
}
|
|
keg = slab->us_keg;
|
|
freei = ((uintptr_t)item - (uintptr_t)slab->us_data) / keg->uk_rsize;
|
|
|
|
if (freei >= keg->uk_ipers)
|
|
panic("Invalid free of %p from zone %p(%s) slab %p(%d)\n",
|
|
item, zone, zone->uz_name, slab, freei);
|
|
|
|
if (((freei * keg->uk_rsize) + slab->us_data) != item)
|
|
panic("Unaligned free of %p from zone %p(%s) slab %p(%d)\n",
|
|
item, zone, zone->uz_name, slab, freei);
|
|
|
|
if (!BIT_ISSET(SLAB_SETSIZE, freei, &slab->us_debugfree))
|
|
panic("Duplicate free of %p from zone %p(%s) slab %p(%d)\n",
|
|
item, zone, zone->uz_name, slab, freei);
|
|
|
|
BIT_CLR_ATOMIC(SLAB_SETSIZE, freei, &slab->us_debugfree);
|
|
}
|
|
#endif /* INVARIANTS */
|
|
|
|
#ifdef DDB
|
|
DB_SHOW_COMMAND(uma, db_show_uma)
|
|
{
|
|
uma_keg_t kz;
|
|
uma_zone_t z;
|
|
uint64_t allocs, frees, sleeps;
|
|
long cachefree;
|
|
int i;
|
|
|
|
db_printf("%18s %8s %8s %8s %12s %8s %8s\n", "Zone", "Size", "Used",
|
|
"Free", "Requests", "Sleeps", "Bucket");
|
|
LIST_FOREACH(kz, &uma_kegs, uk_link) {
|
|
LIST_FOREACH(z, &kz->uk_zones, uz_link) {
|
|
if (kz->uk_flags & UMA_ZFLAG_INTERNAL) {
|
|
allocs = counter_u64_fetch(z->uz_allocs);
|
|
frees = counter_u64_fetch(z->uz_frees);
|
|
sleeps = z->uz_sleeps;
|
|
cachefree = 0;
|
|
} else
|
|
uma_zone_sumstat(z, &cachefree, &allocs,
|
|
&frees, &sleeps);
|
|
if (!((z->uz_flags & UMA_ZONE_SECONDARY) &&
|
|
(LIST_FIRST(&kz->uk_zones) != z)))
|
|
cachefree += kz->uk_free;
|
|
for (i = 0; i < vm_ndomains; i++)
|
|
cachefree += z->uz_domain[i].uzd_nitems;
|
|
|
|
db_printf("%18s %8ju %8jd %8ld %12ju %8ju %8u\n",
|
|
z->uz_name, (uintmax_t)kz->uk_size,
|
|
(intmax_t)(allocs - frees), cachefree,
|
|
(uintmax_t)allocs, sleeps, z->uz_count);
|
|
if (db_pager_quit)
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
DB_SHOW_COMMAND(umacache, db_show_umacache)
|
|
{
|
|
uma_zone_t z;
|
|
uint64_t allocs, frees;
|
|
long cachefree;
|
|
int i;
|
|
|
|
db_printf("%18s %8s %8s %8s %12s %8s\n", "Zone", "Size", "Used", "Free",
|
|
"Requests", "Bucket");
|
|
LIST_FOREACH(z, &uma_cachezones, uz_link) {
|
|
uma_zone_sumstat(z, &cachefree, &allocs, &frees, NULL);
|
|
for (i = 0; i < vm_ndomains; i++)
|
|
cachefree += z->uz_domain[i].uzd_nitems;
|
|
db_printf("%18s %8ju %8jd %8ld %12ju %8u\n",
|
|
z->uz_name, (uintmax_t)z->uz_size,
|
|
(intmax_t)(allocs - frees), cachefree,
|
|
(uintmax_t)allocs, z->uz_count);
|
|
if (db_pager_quit)
|
|
return;
|
|
}
|
|
}
|
|
#endif /* DDB */
|