diff options
| author | dg <dg@FreeBSD.org> | 1995-04-04 02:01:13 +0000 |
|---|---|---|
| committer | dg <dg@FreeBSD.org> | 1995-04-04 02:01:13 +0000 |
| commit | b3c54e9bcdd8f8a2b50a5f5ccf9a56de409ea1ad (patch) | |
| tree | 68f8b7afc54e8eb8e88174f20ec57f9253dd8ae0 /sys/kern/vfs_cache.c | |
| parent | 27e6941140e02804857a1c772cc325ec59d631e1 (diff) | |
| download | FreeBSD-src-b3c54e9bcdd8f8a2b50a5f5ccf9a56de409ea1ad.zip FreeBSD-src-b3c54e9bcdd8f8a2b50a5f5ccf9a56de409ea1ad.tar.gz | |
kern_subr.c:
Added a new type to uiomove - "UIO_NOCOPY" which causes it to update
pointers and counts, but doesn't do any data copying. This is needed
for upcoming changes to the way that the vnode pager does its page
outs.
Added a new hash init function call "phashinit" that allocates and
initializes a prime number sized hash table.
vfs_cache.c:
Changed hashing algorithm to use the remainder of dividing by a prime
number to improve the distribution characteristcs. Uses new phashinit
function in kern_subr.c.
Diffstat (limited to 'sys/kern/vfs_cache.c')
| -rw-r--r-- | sys/kern/vfs_cache.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c index 8dc79db..bb4b8be 100644 --- a/sys/kern/vfs_cache.c +++ b/sys/kern/vfs_cache.c @@ -33,7 +33,7 @@ * SUCH DAMAGE. * * @(#)vfs_cache.c 8.3 (Berkeley) 8/22/94 - * $Id: vfs_cache.c,v 1.11 1995/03/12 02:01:20 phk Exp $ + * $Id: vfs_cache.c,v 1.12 1995/03/19 09:33:51 davidg Exp $ */ #include <sys/param.h> @@ -72,7 +72,7 @@ */ LIST_HEAD(nchashhead, namecache) *nchashtbl; /* Hash Table */ TAILQ_HEAD(, namecache) nclruhead; /* LRU chain */ -u_long nchash; /* size of hash table - 1 */ +u_long nchash; /* size of hash table */ struct nchstats nchstats; /* cache effectiveness statistics */ struct vnode nchENOENT; /* our own "novnode" */ int doingcache = 1; /* 1 => enable the cache */ @@ -134,7 +134,7 @@ cache_lookup(dvp, vpp, cnp) return (0); } - ncpp = &nchashtbl[(dvp->v_id + cnp->cn_hash) & nchash]; + ncpp = &nchashtbl[(dvp->v_id + cnp->cn_hash) % nchash]; for (ncp = ncpp->lh_first; ncp != 0; ncp = nnp) { nnp = ncp->nc_hash.le_next; /* If one of the vp's went stale, don't bother anymore. */ @@ -235,7 +235,7 @@ cache_enter(dvp, vp, cnp) ncp->nc_nlen = cnp->cn_namelen; bcopy(cnp->cn_nameptr, ncp->nc_name, (unsigned)ncp->nc_nlen); TAILQ_INSERT_TAIL(&nclruhead, ncp, nc_lru); - ncpp = &nchashtbl[(dvp->v_id + cnp->cn_hash) & nchash]; + ncpp = &nchashtbl[(dvp->v_id + cnp->cn_hash) % nchash]; LIST_INSERT_HEAD(ncpp, ncp, nc_hash); } @@ -248,7 +248,7 @@ nchinit() { TAILQ_INIT(&nclruhead); - nchashtbl = hashinit(desiredvnodes, M_CACHE, &nchash); + nchashtbl = phashinit(desiredvnodes, M_CACHE, &nchash); nchENOENT.v_id = 1; } |
