Author: mjg
Date: Mon Sep 23 08:53:14 2019
New Revision: 352617
URL: https://svnweb.freebsd.org/changeset/base/352617

Log:
  cache: count evictions of negatve entries
  
  Sponsored by: The FreeBSD Foundation

Modified:
  head/sys/kern/vfs_cache.c

Modified: head/sys/kern/vfs_cache.c
==============================================================================
--- head/sys/kern/vfs_cache.c   Mon Sep 23 07:23:29 2019        (r352616)
+++ head/sys/kern/vfs_cache.c   Mon Sep 23 08:53:14 2019        (r352617)
@@ -378,6 +378,8 @@ STATNODE_COUNTER(numfullpathfail2,
     "Number of fullpath search errors (VOP_VPTOCNP failures)");
 STATNODE_COUNTER(numfullpathfail4, "Number of fullpath search errors 
(ENOMEM)");
 STATNODE_COUNTER(numfullpathfound, "Number of successful fullpath calls");
+static long numneg_evicted; STATNODE_ULONG(numneg_evicted,
+    "Number of negative entries evicted when adding a new entry");
 STATNODE_COUNTER(zap_and_exit_bucket_relock_success,
     "Number of successful removals after relocking");
 static long zap_and_exit_bucket_fail; STATNODE_ULONG(zap_and_exit_bucket_fail,
@@ -844,6 +846,7 @@ cache_negative_zap_one(void)
            ncp->nc_name, ncp->nc_neghits);
 
        cache_zap_locked(ncp, true);
+       numneg_evicted++;
 out_unlock_all:
        mtx_unlock(&neglist->nl_lock);
        rw_wunlock(blp);
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