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uma: Split bucket_cache_drain() to permit per-domain reclamation

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Note that the per-domain variant does not shrink the target bucket size.

No functional change intended.

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2021-04-09 09:47:09 -04:00
parent 29bb6c19f0
commit 54f421f9e8
1 changed files with 42 additions and 36 deletions
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78
sys/vm/uma_core.c
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@ -1400,11 +1400,50 @@ pcpu_cache_drain_safe(uma_zone_t zone)
* estimated working set size.
*/
static void
bucket_cache_reclaim(uma_zone_t zone, bool drain)
bucket_cache_reclaim_domain(uma_zone_t zone, bool drain, int domain)
{
uma_zone_domain_t zdom;
uma_bucket_t bucket;
long target;
/*
* The cross bucket is partially filled and not part of
* the item count. Reclaim it individually here.
*/
zdom = ZDOM_GET(zone, domain);
if ((zone->uz_flags & UMA_ZONE_SMR) == 0 || drain) {
ZONE_CROSS_LOCK(zone);
bucket = zdom->uzd_cross;
zdom->uzd_cross = NULL;
ZONE_CROSS_UNLOCK(zone);
if (bucket != NULL)
bucket_free(zone, bucket, NULL);
}
/*
* If we were asked to drain the zone, we are done only once
* this bucket cache is empty. Otherwise, we reclaim items in
* excess of the zone's estimated working set size. If the
* difference nitems - imin is larger than the WSS estimate,
* then the estimate will grow at the end of this interval and
* we ignore the historical average.
*/
ZDOM_LOCK(zdom);
target = drain ? 0 : lmax(zdom->uzd_wss, zdom->uzd_nitems -
zdom->uzd_imin);
while (zdom->uzd_nitems > target) {
bucket = zone_fetch_bucket(zone, zdom, true);
if (bucket == NULL)
break;
bucket_free(zone, bucket, NULL);
ZDOM_LOCK(zdom);
}
ZDOM_UNLOCK(zdom);
}
static void
bucket_cache_reclaim(uma_zone_t zone, bool drain)
{
int i;
/*
@ -1414,41 +1453,8 @@ bucket_cache_reclaim(uma_zone_t zone, bool drain)
if (zone->uz_bucket_size > zone->uz_bucket_size_min)
zone->uz_bucket_size--;
for (i = 0; i < vm_ndomains; i++) {
/*
* The cross bucket is partially filled and not part of
* the item count. Reclaim it individually here.
*/
zdom = ZDOM_GET(zone, i);
if ((zone->uz_flags & UMA_ZONE_SMR) == 0 || drain) {
ZONE_CROSS_LOCK(zone);
bucket = zdom->uzd_cross;
zdom->uzd_cross = NULL;
ZONE_CROSS_UNLOCK(zone);
if (bucket != NULL)
bucket_free(zone, bucket, NULL);
}
/*
* If we were asked to drain the zone, we are done only once
* this bucket cache is empty. Otherwise, we reclaim items in
* excess of the zone's estimated working set size. If the
* difference nitems - imin is larger than the WSS estimate,
* then the estimate will grow at the end of this interval and
* we ignore the historical average.
*/
ZDOM_LOCK(zdom);
target = drain ? 0 : lmax(zdom->uzd_wss, zdom->uzd_nitems -
zdom->uzd_imin);
while (zdom->uzd_nitems > target) {
bucket = zone_fetch_bucket(zone, zdom, true);
if (bucket == NULL)
break;
bucket_free(zone, bucket, NULL);
ZDOM_LOCK(zdom);
}
ZDOM_UNLOCK(zdom);
}
for (i = 0; i < vm_ndomains; i++)
bucket_cache_reclaim_domain(zone, drain, i);
}
static void