Eliminated many redundant vm_map_lookup operations for vm_mmap.

Speed up for vfs_bio -- addition of a routine bqrelse to greatly diminish
	overhead for merged cache.
Efficiency improvement for vfs_cluster.  It used to do alot of redundant
	calls to cluster_rbuild.
Correct the ordering for vrele of .text and release of credentials.
Use the selective tlb update for 486/586/P6.
Numerous fixes to the size of objects allocated for files.  Additionally,
	fixes in the various pagers.
Fixes for proper positioning of vnode_pager_setsize in msdosfs and ext2fs.
Fixes in the swap pager for exhausted resources.  The pageout code
	will not as readily thrash.
Change the page queue flags (PG_ACTIVE, PG_INACTIVE, PG_FREE, PG_CACHE) into
	page queue indices (PQ_ACTIVE, PQ_INACTIVE, PQ_FREE, PQ_CACHE),
	thereby improving efficiency of several routines.
Eliminate even more unnecessary vm_page_protect operations.
Significantly speed up process forks.
Make vm_object_page_clean more efficient, thereby eliminating the pause
	that happens every 30seconds.
Make sequential clustered writes B_ASYNC instead of B_DELWRI even in the
	case of filesystems mounted async.
Fix a panic with busy pages when write clustering is done for non-VMIO
	buffers.

1 files changed, 5 insertions, 3 deletions

diff --git a/sys/fs/msdosfs/msdosfs_denode.c b/sys/fs/msdosfs/msdosfs_denode.c
index 9f71630b282e..2f86783c9a3e 100644
--- a/sys/fs/msdosfs/msdosfs_denode.c
+++ b/sys/fs/msdosfs/msdosfs_denode.c
@@ -1,4 +1,4 @@
-/*	$Id: msdosfs_denode.c,v 1.14 1995/12/03 16:41:53 bde Exp $ */
+/*	$Id: msdosfs_denode.c,v 1.15 1995/12/07 12:47:19 davidg Exp $ */
 /*	$NetBSD: msdosfs_denode.c,v 1.9 1994/08/21 18:44:00 ws Exp $	*/
 
 /*-
@@ -442,10 +442,11 @@ detrunc(dep, length, flags, cred, p)
 		return EINVAL;
 	}
 
-	vnode_pager_setsize(DETOV(dep), length);
 
-	if (dep->de_FileSize < length)
+	if (dep->de_FileSize < length) {
+		vnode_pager_setsize(DETOV(dep), length);
 		return deextend(dep, length, cred);
+	}
 
 	/*
 	 * If the desired length is 0 then remember the starting cluster of
@@ -515,6 +516,7 @@ detrunc(dep, length, flags, cred, p)
 	dep->de_flag |= DE_UPDATE;
 	vflags = (length > 0 ? V_SAVE : 0) | V_SAVEMETA;
 	vinvalbuf(DETOV(dep), vflags, cred, p, 0, 0);
+	vnode_pager_setsize(DETOV(dep), length);
 	TIMEVAL_TO_TIMESPEC(&time, &ts);
 	allerror = deupdat(dep, &ts, 1);
 #ifdef MSDOSFS_DEBUG