Make uz_allocs, uz_frees and uz_fails counter(9). This removes some
atomic updates and reduces amount of data protected by zone lock. During startup point these fields to EARLY_COUNTER. After startup allocate them for all early zones. Tested by: pho
This commit is contained in:
parent
7f124c950a
commit
2efcc8cbca
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=343051
@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/counter.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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@ -1715,6 +1715,15 @@ keg_ctor(void *mem, int size, void *udata, int flags)
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return (0);
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}
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static void
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zone_alloc_counters(uma_zone_t zone)
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{
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zone->uz_allocs = counter_u64_alloc(M_WAITOK);
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zone->uz_frees = counter_u64_alloc(M_WAITOK);
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zone->uz_fails = counter_u64_alloc(M_WAITOK);
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}
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/*
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* Zone header ctor. This initializes all fields, locks, etc.
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*
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@ -1736,9 +1745,6 @@ zone_ctor(void *mem, int size, void *udata, int flags)
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zone->uz_slab = zone_fetch_slab;
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zone->uz_init = NULL;
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zone->uz_fini = NULL;
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zone->uz_allocs = 0;
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zone->uz_frees = 0;
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zone->uz_fails = 0;
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zone->uz_sleeps = 0;
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zone->uz_count = 0;
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zone->uz_count_min = 0;
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@ -1750,6 +1756,14 @@ zone_ctor(void *mem, int size, void *udata, int flags)
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zone->uz_bkt_max = ULONG_MAX;
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timevalclear(&zone->uz_ratecheck);
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if (__predict_true(booted == BOOT_RUNNING))
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zone_alloc_counters(zone);
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else {
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zone->uz_allocs = EARLY_COUNTER;
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zone->uz_frees = EARLY_COUNTER;
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zone->uz_fails = EARLY_COUNTER;
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}
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/*
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* This is a pure cache zone, no kegs.
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*/
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@ -1908,6 +1922,9 @@ zone_dtor(void *arg, int size, void *udata)
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rw_wunlock(&uma_rwlock);
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zone_free_item(kegs, keg, NULL, SKIP_NONE);
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}
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counter_u64_free(zone->uz_allocs);
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counter_u64_free(zone->uz_frees);
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counter_u64_free(zone->uz_fails);
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if (zone->uz_lockptr == &zone->uz_lock)
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ZONE_LOCK_FINI(zone);
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}
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@ -1928,12 +1945,19 @@ zone_foreach(void (*zfunc)(uma_zone_t))
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uma_keg_t keg;
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uma_zone_t zone;
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rw_rlock(&uma_rwlock);
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/*
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* Before BOOT_RUNNING we are guaranteed to be single
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* threaded, so locking isn't needed. Startup functions
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* are allowed to use M_WAITOK.
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*/
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if (__predict_true(booted == BOOT_RUNNING))
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rw_rlock(&uma_rwlock);
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LIST_FOREACH(keg, &uma_kegs, uk_link) {
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LIST_FOREACH(zone, &keg->uk_zones, uz_link)
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zfunc(zone);
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}
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rw_runlock(&uma_rwlock);
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if (__predict_true(booted == BOOT_RUNNING))
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rw_runlock(&uma_rwlock);
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}
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/*
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@ -2109,6 +2133,7 @@ uma_startup3(void)
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uma_dbg_cnt = counter_u64_alloc(M_WAITOK);
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uma_skip_cnt = counter_u64_alloc(M_WAITOK);
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#endif
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zone_foreach(zone_alloc_counters);
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callout_init(&uma_callout, 1);
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callout_reset(&uma_callout, UMA_TIMEOUT * hz, uma_timeout, NULL);
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booted = BOOT_RUNNING;
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@ -2387,7 +2412,7 @@ uma_zalloc_arg(uma_zone_t zone, void *udata, int flags)
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zone->uz_dtor != trash_dtor) &&
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#endif
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zone->uz_ctor(item, zone->uz_size, udata, flags) != 0) {
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atomic_add_long(&zone->uz_fails, 1);
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counter_u64_add(zone->uz_fails, 1);
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zone_free_item(zone, item, udata, SKIP_DTOR | SKIP_CNT);
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return (NULL);
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}
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@ -2845,7 +2870,7 @@ zone_alloc_bucket(uma_zone_t zone, void *udata, int domain, int flags, int max)
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if (bucket->ub_cnt == 0) {
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bucket_free(zone, bucket, udata);
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atomic_add_long(&zone->uz_fails, 1);
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counter_u64_add(zone->uz_fails, 1);
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return (NULL);
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}
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@ -2905,7 +2930,6 @@ zone_alloc_item_locked(uma_zone_t zone, void *udata, int domain, int flags)
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}
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zone->uz_items++;
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zone->uz_allocs++;
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ZONE_UNLOCK(zone);
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if (domain != UMA_ANYDOMAIN) {
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@ -2947,6 +2971,7 @@ zone_alloc_item_locked(uma_zone_t zone, void *udata, int domain, int flags)
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if (flags & M_ZERO)
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uma_zero_item(item, zone);
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counter_u64_add(zone->uz_allocs, 1);
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CTR3(KTR_UMA, "zone_alloc_item item %p from %s(%p)", item,
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zone->uz_name, zone);
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@ -2955,9 +2980,8 @@ zone_alloc_item_locked(uma_zone_t zone, void *udata, int domain, int flags)
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fail:
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ZONE_LOCK(zone);
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zone->uz_items--;
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zone->uz_allocs--;
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ZONE_UNLOCK(zone);
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atomic_add_long(&zone->uz_fails, 1);
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counter_u64_add(zone->uz_fails, 1);
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CTR2(KTR_UMA, "zone_alloc_item failed from %s(%p)",
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zone->uz_name, zone);
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return (NULL);
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@ -3268,8 +3292,9 @@ zone_free_item(uma_zone_t zone, void *item, void *udata, enum zfreeskip skip)
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if (skip & SKIP_CNT)
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return;
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counter_u64_add(zone->uz_frees, 1);
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ZONE_LOCK(zone);
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zone->uz_frees++;
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zone->uz_items--;
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if (zone->uz_sleepers > 0 && zone->uz_items < zone->uz_max_items)
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wakeup_one(zone);
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@ -3358,7 +3383,8 @@ uma_zone_get_cur(uma_zone_t zone)
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u_int i;
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ZONE_LOCK(zone);
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nitems = zone->uz_allocs - zone->uz_frees;
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nitems = counter_u64_fetch(zone->uz_allocs) -
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counter_u64_fetch(zone->uz_frees);
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CPU_FOREACH(i) {
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/*
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* See the comment in sysctl_vm_zone_stats() regarding the
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@ -3801,8 +3827,8 @@ uma_zone_sumstat(uma_zone_t z, long *cachefreep, uint64_t *allocsp,
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allocs += cache->uc_allocs;
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frees += cache->uc_frees;
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}
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allocs += z->uz_allocs;
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frees += z->uz_frees;
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allocs += counter_u64_fetch(z->uz_allocs);
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frees += counter_u64_fetch(z->uz_frees);
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sleeps += z->uz_sleeps;
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if (cachefreep != NULL)
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*cachefreep = cachefree;
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@ -3895,9 +3921,9 @@ sysctl_vm_zone_stats(SYSCTL_HANDLER_ARGS)
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zdom = &z->uz_domain[i];
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uth.uth_zone_free += zdom->uzd_nitems;
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}
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uth.uth_allocs = z->uz_allocs;
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uth.uth_frees = z->uz_frees;
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uth.uth_fails = z->uz_fails;
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uth.uth_allocs = counter_u64_fetch(z->uz_allocs);
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uth.uth_frees = counter_u64_fetch(z->uz_frees);
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uth.uth_fails = counter_u64_fetch(z->uz_fails);
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uth.uth_sleeps = z->uz_sleeps;
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/*
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* While it is not normally safe to access the cache
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@ -4105,8 +4131,8 @@ DB_SHOW_COMMAND(uma, db_show_uma)
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LIST_FOREACH(kz, &uma_kegs, uk_link) {
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LIST_FOREACH(z, &kz->uk_zones, uz_link) {
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if (kz->uk_flags & UMA_ZFLAG_INTERNAL) {
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allocs = z->uz_allocs;
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frees = z->uz_frees;
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allocs = counter_u64_fetch(z->uz_allocs);
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frees = counter_u64_fetch(z->uz_frees);
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sleeps = z->uz_sleeps;
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cachefree = 0;
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} else
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@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
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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/counter.h>
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#include <sys/kernel.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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@ -364,10 +364,10 @@ struct uma_zone {
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uint16_t uz_count_min; /* Minimal amount of items in bucket */
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/* Offset 256, stats. */
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uint64_t uz_allocs UMA_ALIGN; /* Total number of allocations */
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counter_u64_t uz_allocs; /* Total number of allocations */
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counter_u64_t uz_frees; /* Total number of frees */
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counter_u64_t uz_fails; /* Total number of alloc failures */
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uint64_t uz_sleeps; /* Total number of alloc sleeps */
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uint64_t uz_frees; /* Total number of frees */
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volatile u_long uz_fails; /* Total number of alloc failures */
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/*
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* This HAS to be the last item because we adjust the zone size
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