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Another little optimization to the nameicache.

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If an entry is stale, ditch it.
This commit is contained in:
Poul-Henning Kamp 1995-03-08 01:40:44 +00:00
parent 2425396b27
commit a0e8a1e29b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6952
1 changed files with 4 additions and 14 deletions
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18
sys/kern/vfs_cache.c
View file

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)vfs_cache.c 8.3 (Berkeley) 8/22/94
* $Id: vfs_cache.c,v 1.5 1995/03/06 06:45:52 phk Exp $
* $Id: vfs_cache.c,v 1.6 1995/03/08 01:08:03 phk Exp $
*/
#include <sys/param.h>
@ -112,20 +112,14 @@ cache_lookup(dvp, vpp, cnp)
!bcmp(ncp->nc_name, cnp->cn_nameptr, (u_int)ncp->nc_nlen))
break;
nnp = ncp->nc_hash.le_next;
#ifdef not_yet_phk
/*
* if not already last and one of the vp's are invalid,
* move to head of LRU
*/
if ((ncp->nc_lru.tqe_next != 0) &&
( (ncp->nc_dvpid != ncp->nc_dvp->v_id) ||
(ncp->nc_vp && (ncp->nc_vpid != ncp->nc_vp->v_id)))) {
/* If one of the vp's went stale, don't bother anymore. */
if ((ncp->nc_dvpid != ncp->nc_dvp->v_id) ||
(ncp->nc_vp && (ncp->nc_vpid != ncp->nc_vp->v_id))) {
LIST_REMOVE(ncp, nc_hash);
ncp->nc_hash.le_prev = 0;
TAILQ_REMOVE(&nclruhead, ncp, nc_lru);
TAILQ_INSERT_HEAD(&nclruhead, ncp, nc_lru);
}
#endif /* not_yet_phk */
}
if (ncp == 0) {
nchstats.ncs_miss++;
@ -157,10 +151,6 @@ cache_lookup(dvp, vpp, cnp)
TAILQ_REMOVE(&nclruhead, ncp, nc_lru);
TAILQ_INSERT_TAIL(&nclruhead, ncp, nc_lru);
}
#ifdef not_yet_phk
/* Touch the parent vnode */
vtouch(ncp->nc_dvp);
#endif /* not_yet_phk */
*vpp = ncp->nc_vp;
return (-1);
}