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cache: count dropped entries

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This commit is contained in:
Mateusz Guzik 2020-07-14 21:17:08 +00:00
parent 654e644e80
commit 4516c7eed9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=363200
1 changed files with 2 additions and 0 deletions
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sys/kern/vfs_cache.c
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@ -408,6 +408,7 @@ STATNODE_ULONG(numneg, "Number of negative cache entries");
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, struct componentname *cnp,
lnumcache = atomic_fetchadd_long(&numcache, 1) + 1;
if (__predict_false(lnumcache >= ncsize)) {
atomic_add_long(&numcache, -1);
counter_u64_add(numdrops, 1);
return;
}