[PATCH] ignore referenced pages on reclaim when OOM

[Marcelo Tosatti <marcelo.tosatti@cyclades.com>]

Andrew,

Can you please apply Rik's patch? 

Ignore referenced bit when priority reaches 0. Get out of such
OOM situation as fast as possible, instead of running around 
trying to find elegible pages for reclaim. 

Speeds up extreme load performance on Rik's tests.

----- Forwarded message from Rik van Riel <riel@redhat.com> -----

From: Rik van Riel <riel@redhat.com>
Date: Fri, 5 Nov 2004 16:56:17 -0500 (EST)
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Subject: [PATCH] fix OOM problem
X-X-Sender: riel@chimarrao.boston.redhat.com
X-MIMETrack: Itemize by SMTP Server on USMail/Cyclades(Release 6.5.1|January 21, 2004) at
 11/05/2004 13:58:40



===== mm/vmscan.c 1.231 vs edited =====
--- 1.231/mm/vmscan.c	Sun Oct 17 01:07:24 2004
+++ edited/mm/vmscan.c	Mon Oct 25 17:38:56 2004
@@ -379,7 +379,7 @@
 
 		referenced = page_referenced(page, 1);
 		/* In active use or really unfreeable?  Activate it. */
-		if (referenced && page_mapping_inuse(page))
+		if (referenced && sc->priority && page_mapping_inuse(page))
 			goto activate_locked;
 
 #ifdef CONFIG_SWAP
@@ -715,7 +715,7 @@
 		if (page_mapped(page)) {
 			if (!reclaim_mapped ||
 			    (total_swap_pages == 0 && PageAnon(page)) ||
-			    page_referenced(page, 0)) {
+			    (page_referenced(page, 0) && sc->priority)) {
 				list_add(&page->lru, &l_active);
 				continue;
 			}



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