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| author | kib <kib@FreeBSD.org> | 2010-10-16 09:44:31 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2010-10-16 09:44:31 +0000 |
| commit | 61f7905664175dc40eba88051c72cbfaec3e0c4c (patch) | |
| tree | 47224394dae8321e50d4708778977e868393331d /sys/kern/vfs_cache.c | |
| parent | 91a790ee6eb79ee70716805678dce2cca93a990b (diff) | |
| download | FreeBSD-src-61f7905664175dc40eba88051c72cbfaec3e0c4c.zip FreeBSD-src-61f7905664175dc40eba88051c72cbfaec3e0c4c.tar.gz | |
Provide vfs.ncsizefactor instead of hard-coding namecache ratio.
Move debug.ncnegfactor to vfs.ncnegfactor [1].
Provide some descriptions for the namecache related sysctls [1].
Based on the submission by: Rogier R. Mulhuijzen <drwilco drwilco net> [1]
MFC after: 2 weeks
X-MFC-note: remove debug.ncnegfactor in HEAD after MFC
Diffstat (limited to 'sys/kern/vfs_cache.c')
| -rw-r--r-- | sys/kern/vfs_cache.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c index 026aec3..5a48a67 100644 --- a/sys/kern/vfs_cache.c +++ b/sys/kern/vfs_cache.c @@ -126,20 +126,27 @@ struct namecache { static LIST_HEAD(nchashhead, namecache) *nchashtbl; /* Hash Table */ static TAILQ_HEAD(, namecache) ncneg; /* Hash Table */ static u_long nchash; /* size of hash table */ -SYSCTL_ULONG(_debug, OID_AUTO, nchash, CTLFLAG_RD, &nchash, 0, ""); +SYSCTL_ULONG(_debug, OID_AUTO, nchash, CTLFLAG_RD, &nchash, 0, + "Size of namecache hash table"); static u_long ncnegfactor = 16; /* ratio of negative entries */ +/* _debug sysctl left for backward compatibility */ SYSCTL_ULONG(_debug, OID_AUTO, ncnegfactor, CTLFLAG_RW, &ncnegfactor, 0, ""); -static u_long numneg; /* number of cache entries allocated */ -SYSCTL_ULONG(_debug, OID_AUTO, numneg, CTLFLAG_RD, &numneg, 0, ""); +SYSCTL_ULONG(_vfs, OID_AUTO, ncnegfactor, CTLFLAG_RW, &ncnegfactor, 0, + "Ratio of negative namecache entries"); +static u_long numneg; /* number of negative entries allocated */ +SYSCTL_ULONG(_debug, OID_AUTO, numneg, CTLFLAG_RD, &numneg, 0, + "Number of negative entries in namecache"); static u_long numcache; /* number of cache entries allocated */ -SYSCTL_ULONG(_debug, OID_AUTO, numcache, CTLFLAG_RD, &numcache, 0, ""); +SYSCTL_ULONG(_debug, OID_AUTO, numcache, CTLFLAG_RD, &numcache, 0, + "Number of namecache entries"); static u_long numcachehv; /* number of cache entries with vnodes held */ -SYSCTL_ULONG(_debug, OID_AUTO, numcachehv, CTLFLAG_RD, &numcachehv, 0, ""); -#if 0 -static u_long numcachepl; /* number of cache purge for leaf entries */ -SYSCTL_ULONG(_debug, OID_AUTO, numcachepl, CTLFLAG_RD, &numcachepl, 0, ""); -#endif -struct nchstats nchstats; /* cache effectiveness statistics */ +SYSCTL_ULONG(_debug, OID_AUTO, numcachehv, CTLFLAG_RD, &numcachehv, 0, + "Number of namecache entries with vnodes held"); +static u_int ncsizefactor = 2; +SYSCTL_UINT(_vfs, OID_AUTO, ncsizefactor, CTLFLAG_RW, &ncsizefactor, 0, + "Size factor for namecache"); + +struct nchstats nchstats; /* cache effectiveness statistics */ static struct rwlock cache_lock; RW_SYSINIT(vfscache, &cache_lock, "Name Cache"); @@ -174,7 +181,8 @@ static uma_zone_t cache_zone_large; } while (0) static int doingcache = 1; /* 1 => enable the cache */ -SYSCTL_INT(_debug, OID_AUTO, vfscache, CTLFLAG_RW, &doingcache, 0, ""); +SYSCTL_INT(_debug, OID_AUTO, vfscache, CTLFLAG_RW, &doingcache, 0, + "VFS namecache enabled"); /* Export size information to userland */ SYSCTL_INT(_debug_sizeof, OID_AUTO, namecache, CTLFLAG_RD, 0, @@ -620,7 +628,7 @@ cache_enter(dvp, vp, cnp) /* * Avoid blowout in namecache entries. */ - if (numcache >= desiredvnodes * 2) + if (numcache >= desiredvnodes * ncsizefactor) return; flag = 0; |
