Several bugfixes/improvements:

	1) Make it much less likely to miss a wakeup in vm_page_free_wakeup
	2) Create a new entry point into pmap: pmap_ts_referenced, eliminates
	   the need to scan the pv lists twice in many cases.  Perhaps there
	   is alot more to do here to work on minimizing pv list manipulation
	3) Minor improvements to vm_pageout including the use of pmap_ts_ref.
	4) Major changes and code improvement to pmap.  This code has had
	   several serious bugs in page table page manipulation.  In order
	   to simplify the problem, and hopefully solve it for once and all,
	   page table pages are no longer "managed" with the pv list stuff.
	   Page table pages are only (mapped and held/wired) or
	   (free and unused) now.  Page table pages are never inactive,
	   active or cached.  These changes have probably fixed the
	   hold count problems, but if they haven't, then the code is
	   simpler anyway for future bugfixing.
	5) The pmap code has been sorely in need of re-organization, and I
	   have taken a first (of probably many) steps.  Please tell me
	   if you have any ideas.

1 files changed, 4 insertions, 3 deletions

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index d33495f..445c207 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)vm_page.c	7.4 (Berkeley) 5/7/91
- *	$Id: vm_page.c,v 1.56 1996/06/12 06:52:06 dyson Exp $
+ *	$Id: vm_page.c,v 1.57 1996/06/16 20:37:31 dyson Exp $
  */
 
 /*
@@ -802,12 +802,13 @@ vm_page_free_wakeup()
 	 * high water mark. And wakeup scheduler process if we have
 	 * lots of memory. this process will swapin processes.
 	 */
-	if ((cnt.v_free_count + cnt.v_cache_count) == cnt.v_free_min) {
+	if (vm_pages_needed &&
+		((cnt.v_free_count + cnt.v_cache_count) >= cnt.v_free_min)) {
 		wakeup(&cnt.v_free_count);
+		vm_pages_needed = 0;
 	}
 }
 
-	
 /*
  *	vm_page_free:
  *