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Add a mechanism to disable buckets when the v_free_count drops below

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v_free_min.  This should help performance in memory starved situations.
This commit is contained in:
jeff 2002-04-08 06:20:34 +00:00
parent 92869adb92
commit 73be05f8fd
1 changed files with 29 additions and 6 deletions
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35
sys/vm/uma_core.c
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@ -66,9 +66,11 @@
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/sysctl.h>
#include <machine/types.h>
#include <sys/mutex.h>
#include <sys/smp.h>
#include <sys/vmmeter.h>
#include <machine/types.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
@ -85,8 +87,8 @@
* the zone heads are allocated from the allocator, so we use the bss section
* to bootstrap us.
*/
static struct uma_zone master_zone;
static uma_zone_t zones = &master_zone;
static struct uma_zone masterzone;
static uma_zone_t zones = &masterzone;
/* This is the zone from which all of uma_slab_t's are allocated. */
static uma_zone_t slabzone;
@ -102,6 +104,11 @@ static uma_zone_t hashzone;
*/
static uma_zone_t bucketzone;
/*
* Are we allowed to allocate buckets?
*/
static int bucketdisable = 1;
/* Linked list of all zones in the system */
static LIST_HEAD(,uma_zone) uma_zones = LIST_HEAD_INITIALIZER(&uma_zones);
@ -168,8 +175,8 @@ static void hash_free(struct uma_hash *hash);
static void uma_timeout(void *);
static void uma_startup3(void);
static void *uma_zalloc_internal(uma_zone_t, void *, int, uma_bucket_t);
static void uma_zfree_internal(uma_zone_t,
void *, void *, int);
static void uma_zfree_internal(uma_zone_t, void *, void *, int);
static void bucket_enable(void);
void uma_print_zone(uma_zone_t);
void uma_print_stats(void);
static int sysctl_vm_zone(SYSCTL_HANDLER_ARGS);
@ -178,6 +185,19 @@ SYSCTL_OID(_vm, OID_AUTO, zone, CTLTYPE_STRING|CTLFLAG_RD,
NULL, 0, sysctl_vm_zone, "A", "Zone Info");
SYSINIT(uma_startup3, SI_SUB_VM_CONF, SI_ORDER_SECOND, uma_startup3, NULL);
/*
* This routine checks to see whether or not it's safe to enable buckets.
*/
static void
bucket_enable(void)
{
if (cnt.v_free_count < cnt.v_free_min)
bucketdisable = 1;
else
bucketdisable = 0;
}
/*
* Routine called by timeout which is used to fire off some time interval
@ -192,6 +212,7 @@ SYSINIT(uma_startup3, SI_SUB_VM_CONF, SI_ORDER_SECOND, uma_startup3, NULL);
static void
uma_timeout(void *unused)
{
bucket_enable();
zone_foreach(zone_timeout);
/* Reschedule this event */
@ -1172,6 +1193,7 @@ uma_startup2(void *hashmem, u_long elems)
mallochash->uh_hashsize = elems;
mallochash->uh_hashmask = elems - 1;
booted = 1;
bucket_enable();
#ifdef UMA_DEBUG
printf("UMA startup2 complete.\n");
#endif
@ -1384,7 +1406,7 @@ uma_zalloc_internal(uma_zone_t zone, void *udata, int wait, uma_bucket_t bucket)
* boot pages.
*/
if (!booted && zone == bucketzone)
if (bucketdisable && zone == bucketzone)
return (NULL);
#ifdef UMA_DEBUG_ALLOC
@ -1825,6 +1847,7 @@ uma_reclaim(void)
#ifdef UMA_DEBUG
printf("UMA: vm asked us to release pages!\n");
#endif
bucket_enable();
zone_foreach(zone_drain);
/*