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Grow UMA zone bucket size also on lock congestion during item free.

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Lock congestion is the same, whether it happens on alloc or free, so
handle it equally.  Now that we have back pressure, there is no problem
to grow buckets a bit faster.  Any way growth is much slower then in 9.x.
This commit is contained in:
mav 2013-11-19 10:17:10 +00:00
parent 3e43d6e71a
commit 073851700e
1 changed files with 13 additions and 2 deletions
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15
sys/vm/uma_core.c
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@ -2529,6 +2529,7 @@ uma_zfree_arg(uma_zone_t zone, void *item, void *udata)
{
uma_cache_t cache;
uma_bucket_t bucket;
int lockfail;
int cpu;
#ifdef UMA_DEBUG_ALLOC_1
@ -2613,7 +2614,12 @@ uma_zfree_arg(uma_zone_t zone, void *item, void *udata)
if (zone->uz_count == 0 || bucketdisable)
goto zfree_item;
ZONE_LOCK(zone);
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];
@ -2647,7 +2653,12 @@ uma_zfree_arg(uma_zone_t zone, void *item, void *udata)
/* We are no longer associated with this CPU. */
critical_exit();
/* And the zone.. */
/*
* We bump the uz count when the cache size is insufficient to
* handle the working set.
*/
if (lockfail && zone->uz_count < BUCKET_MAX)
zone->uz_count++;
ZONE_UNLOCK(zone);
#ifdef UMA_DEBUG_ALLOC