Author: jeff
Date: Sun Apr 1 04:47:05 2018
New Revision: 331862
URL: https://svnweb.freebsd.org/changeset/base/331862
Log:
Add the flag ZONE_NOBUCKETCACHE. This flag instructions UMA not to keep
a cache of fully populated buckets. This will be used in a follow-on
commit.
The flag idea was originally from markj.
Reviewed by: markj, kib
Tested by: pho
Sponsored by: Netflix, Dell/EMC Isilon
Modified:
head/sys/vm/uma.h
head/sys/vm/uma_core.c
Modified: head/sys/vm/uma.h
==============================================================================
--- head/sys/vm/uma.h Sun Apr 1 04:11:38 2018 (r331861)
+++ head/sys/vm/uma.h Sun Apr 1 04:47:05 2018 (r331862)
@@ -286,6 +286,10 @@ uma_zone_t uma_zcache_create(char *name, int size, uma
* NUMA aware Zone. Implements a best
* effort first-touch policy.
*/
+#define UMA_ZONE_NOBUCKETCACHE 0x20000 /*
+ * Don't cache full buckets. Limit
+ * UMA to per-cpu state.
+ */
/*
* These flags are shared between the keg and zone. In zones wishing to add
Modified: head/sys/vm/uma_core.c
==============================================================================
--- head/sys/vm/uma_core.c Sun Apr 1 04:11:38 2018 (r331861)
+++ head/sys/vm/uma_core.c Sun Apr 1 04:47:05 2018 (r331862)
@@ -2965,7 +2965,13 @@ zfree_start:
/* ub_cnt is pointing to the last free item */
KASSERT(bucket->ub_cnt != 0,
("uma_zfree: Attempting to insert an empty bucket onto the
full list.\n"));
- LIST_INSERT_HEAD(&zdom->uzd_buckets, bucket, ub_link);
+ if ((zone->uz_flags & UMA_ZONE_NOBUCKETCACHE) != 0) {
+ ZONE_UNLOCK(zone);
+ bucket_drain(zone, bucket);
+ bucket_free(zone, bucket, udata);
+ goto zfree_restart;
+ } else
+ LIST_INSERT_HEAD(&zdom->uzd_buckets, bucket, ub_link);
}
/*
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