Author: mjg
Date: Sun Nov 5 21:59:39 2017
New Revision: 325451
URL: https://svnweb.freebsd.org/changeset/base/325451
Log:
namecache: skip locking in cache_lookup_nomakeentry if there is no entry
Modified:
head/sys/kern/vfs_cache.c
Modified: head/sys/kern/vfs_cache.c
==============================================================================
--- head/sys/kern/vfs_cache.c Sun Nov 5 21:43:26 2017 (r325450)
+++ head/sys/kern/vfs_cache.c Sun Nov 5 21:59:39 2017 (r325451)
@@ -1163,6 +1163,9 @@ retry_dotdot:
hash = cache_get_hash(cnp->cn_nameptr, cnp->cn_namelen, dvp);
blp = HASH2BUCKETLOCK(hash);
retry:
+ if (LIST_EMPTY(NCHHASH(hash)))
+ goto out_no_entry;
+
rw_rlock(blp);
LIST_FOREACH(ncp, (NCHHASH(hash)), nc_hash) {
@@ -1175,10 +1178,7 @@ retry:
/* We failed to find an entry */
if (ncp == NULL) {
rw_runlock(blp);
- SDT_PROBE3(vfs, namecache, lookup, miss, dvp, cnp->cn_nameptr,
- NULL);
- counter_u64_add(nummisszap, 1);
- return (0);
+ goto out_no_entry;
}
counter_u64_add(numposzaps, 1);
@@ -1190,6 +1190,10 @@ retry:
goto retry;
}
cache_free(ncp);
+ return (0);
+out_no_entry:
+ SDT_PROBE3(vfs, namecache, lookup, miss, dvp, cnp->cn_nameptr, NULL);
+ counter_u64_add(nummisszap, 1);
return (0);
}
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