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Move the debug.hashstat sysctl tree under DIAGNOSTIC. I measured the

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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
This commit is contained in:
John Baldwin 2009-03-09 19:04:53 +00:00
parent d10910e6ce
commit 4ab2a9a022
1 changed files with 2 additions and 0 deletions
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2
sys/kern/vfs_cache.c
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@ -184,6 +184,7 @@ static MALLOC_DEFINE(M_VFSCACHE, "vfscache", "VFS name cache entries");
*/
#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_HANDLER_ARGS)
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():