Author: mjg
Date: Tue Jul 14 21:17:08 2020
New Revision: 363200
URL: https://svnweb.freebsd.org/changeset/base/363200
Log:
cache: count dropped entries
Modified:
head/sys/kern/vfs_cache.c
Modified: head/sys/kern/vfs_cache.c
==============================================================================
--- head/sys/kern/vfs_cache.c Tue Jul 14 21:16:48 2020 (r363199)
+++ head/sys/kern/vfs_cache.c Tue Jul 14 21:17:08 2020 (r363200)
@@ -408,6 +408,7 @@ STATNODE_ULONG(numneg, "Number of negative cache entri
STATNODE_ULONG(numcache, "Number of cache entries");
STATNODE_COUNTER(numcachehv, "Number of namecache entries with vnodes held");
STATNODE_COUNTER(numcalls, "Number of cache lookups");
+STATNODE_COUNTER(numdrops, "Number of dropped entries due to reaching the
limit");
STATNODE_COUNTER(dothits, "Number of '.' hits");
STATNODE_COUNTER(dotdothits, "Number of '..' hits");
STATNODE_COUNTER(numchecks, "Number of checks in lookup");
@@ -1853,6 +1854,7 @@ cache_enter_time(struct vnode *dvp, struct vnode *vp,
lnumcache = atomic_fetchadd_long(&numcache, 1) + 1;
if (__predict_false(lnumcache >= ncsize)) {
atomic_add_long(&numcache, -1);
+ counter_u64_add(numdrops, 1);
return;
}
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