diff options
| author | phk <phk@FreeBSD.org> | 1997-09-24 07:46:54 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 1997-09-24 07:46:54 +0000 |
| commit | 4d1dd5bc330562db34cd9491a9bfdec784616c69 (patch) | |
| tree | 37a9e7ee83b8079627616b23192fa27bd2156022 /sys/kern/vfs_cache.c | |
| parent | edf92c1ecfc9f94e6fe4f09e373b8441d5d6bf7f (diff) | |
| download | FreeBSD-src-4d1dd5bc330562db34cd9491a9bfdec784616c69.zip FreeBSD-src-4d1dd5bc330562db34cd9491a9bfdec784616c69.tar.gz | |
A couple of handles to tweak, more statistics.
Diffstat (limited to 'sys/kern/vfs_cache.c')
| -rw-r--r-- | sys/kern/vfs_cache.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c index 6289715..08ba8f2 100644 --- a/sys/kern/vfs_cache.c +++ b/sys/kern/vfs_cache.c @@ -34,7 +34,7 @@ * SUCH DAMAGE. * * @(#)vfs_cache.c 8.5 (Berkeley) 3/22/95 - * $Id: vfs_cache.c,v 1.30 1997/09/03 09:20:17 phk Exp $ + * $Id: vfs_cache.c,v 1.31 1997/09/04 08:24:44 phk Exp $ */ #include <sys/param.h> @@ -86,6 +86,26 @@ SYSCTL_INT(_debug, OID_AUTO, vfscache, CTLFLAG_RW, &doingcache, 0, ""); SYSCTL_INT(_debug, OID_AUTO, vnsize, CTLFLAG_RD, 0, sizeof(struct vnode), ""); SYSCTL_INT(_debug, OID_AUTO, ncsize, CTLFLAG_RD, 0, sizeof(struct namecache), ""); +/* + * The new name cache statistics + */ +SYSCTL_NODE(_vfs, CTL_VFS, cache, CTLFLAG_RW, 0, + "Name cache statistics"); +#define STATNODE(mode, name, var) \ + SYSCTL_INT(_vfs_cache, OID_AUTO, name, mode, var, 0, ""); +STATNODE(CTLFLAG_RD, numneg, &numneg); +STATNODE(CTLFLAG_RD, numcache, &numcache); +static u_long numcalls; STATNODE(CTLFLAG_RD, numcalls, &numcalls); +static u_long dothits; STATNODE(CTLFLAG_RD, dothits, &dothits); +static u_long dotdothits; STATNODE(CTLFLAG_RD, dotdothits, &dotdothits); +static u_long numchecks; STATNODE(CTLFLAG_RD, numchecks, &numchecks); +static u_long nummiss; STATNODE(CTLFLAG_RD, nummiss, &nummiss); +static u_long numposzaps; STATNODE(CTLFLAG_RD, numposzaps, &numposzaps); +static u_long numposhits; STATNODE(CTLFLAG_RD, numposhits, &numposhits); +static u_long numnegzaps; STATNODE(CTLFLAG_RD, numnegzaps, &numnegzaps); +static u_long numneghits; STATNODE(CTLFLAG_RD, numneghits, &numneghits); + + static void cache_zap __P((struct namecache *ncp)); /* @@ -143,12 +163,16 @@ cache_lookup(dvp, vpp, cnp) return (0); } + numcalls++; + if (cnp->cn_nameptr[0] == '.') { if (cnp->cn_namelen == 1) { *vpp = dvp; + dothits++; return (-1); } if (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.') { + dotdothits++; if (dvp->v_dd->v_id != dvp->v_ddid || (cnp->cn_flags & MAKEENTRY) == 0) { dvp->v_ddid = 0; @@ -160,6 +184,7 @@ cache_lookup(dvp, vpp, cnp) } LIST_FOREACH(ncp, (NCHHASH(dvp, cnp)), nc_hash) { + numchecks++; if (ncp->nc_dvp == dvp && ncp->nc_nlen == cnp->cn_namelen && !bcmp(ncp->nc_name, cnp->cn_nameptr, (u_int)ncp->nc_nlen)) break; @@ -167,12 +192,14 @@ cache_lookup(dvp, vpp, cnp) /* We failed to find an entry */ if (ncp == 0) { + nummiss++; nchstats.ncs_miss++; return (0); } /* We don't want to have an entry, so dump it */ if ((cnp->cn_flags & MAKEENTRY) == 0) { + numposzaps++; nchstats.ncs_badhits++; cache_zap(ncp); return (0); @@ -180,6 +207,7 @@ cache_lookup(dvp, vpp, cnp) /* We found a "positive" match, return the vnode */ if (ncp->nc_vp) { + numposhits++; nchstats.ncs_goodhits++; *vpp = ncp->nc_vp; return (-1); @@ -187,11 +215,13 @@ cache_lookup(dvp, vpp, cnp) /* We found a negative match, and want to create it, so purge */ if (cnp->cn_nameiop == CREATE) { + numnegzaps++; nchstats.ncs_badhits++; cache_zap(ncp); return (0); } + numneghits++; /* * We found a "negative" match, ENOENT notifies client of this match. * The nc_vpid field records whether this is a whiteout. |
