svn commit: r189593 - head/sys/kern

[John Baldwin]

Author: jhb
Date: Mon Mar  9 19:04:53 2009
New Revision: 189593
URL: http://svn.freebsd.org/changeset/base/189593

Log:
  Move the debug.hashstat sysctl tree under DIAGNOSTIC.  I measured the
  debug.hashstat.rawnchash sysctl in particular as taking 7 milliseconds on
  a 3GHz Intel Xeon (4x2) running 7.1.  It accounted for almost a quarter of
  the total runtime of 'sysctl -a'.  It also performs lots of copyout's while
  holding the namecache lock (this does not attempt to fix that).
  
  MFC after:	2 weeks

Modified:
  head/sys/kern/vfs_cache.c

Modified: head/sys/kern/vfs_cache.c
==============================================================================
--- head/sys/kern/vfs_cache.c	Mon Mar  9 17:53:05 2009	(r189592)
+++ head/sys/kern/vfs_cache.c	Mon Mar  9 19:04:53 2009	(r189593)
@@ -184,6 +184,7 @@ static MALLOC_DEFINE(M_VFSCACHE, "vfscac
  */
 #define NCF_WHITE	1
 
+#ifdef DIAGNOSTIC
 /*
  * Grab an atomic snapshot of the name cache hash chain lengths
  */
@@ -268,6 +269,7 @@ sysctl_debug_hashstat_nchash(SYSCTL_HAND
 SYSCTL_PROC(_debug_hashstat, OID_AUTO, nchash, CTLTYPE_INT|CTLFLAG_RD|
 	CTLFLAG_MPSAFE, 0, 0, sysctl_debug_hashstat_nchash, "I",
 	"nchash chain lengths");
+#endif
 
 /*
  * cache_zap():