linux-kernel - [PATCH] fix to putback_lru_page()/unevictable page handling rework v3

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Date:	Tue, 24 Jun 2008 13:19:47 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>
Subject: [PATCH] fix to putback_lru_page()/unevictable page handling rework
	v3

PATCH fix to rework of putback_lru_page locking.

Against:  26-rc5-mm3 atop Kosaki Motohiro's v3 rework of Kamezawa
Hiroyuki's putback_lru_page rework patch.

'lru' was not being set to 'UNEVICTABLE when page was, in fact,
unevictable [really "nonreclaimable" :-)], so retry would never
happen, and culled pages never counted.

Also, redundant mem_cgroup_move_lists()--one with incorrect 'lru',
in the case of unevictable pages--messes up memcontroller tracking [I think].

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@...com>

 mm/vmscan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.26-rc5-mm3/mm/vmscan.c
===================================================================
--- linux-2.6.26-rc5-mm3.orig/mm/vmscan.c	2008-06-23 11:45:26.000000000 -0400
+++ linux-2.6.26-rc5-mm3/mm/vmscan.c	2008-06-24 12:45:15.000000000 -0400
@@ -514,8 +514,8 @@ redo:
 		 * Put unevictable pages directly on zone's unevictable
 		 * list.
 		 */
+		lru = LRU_UNEVICTABLE;
 		add_page_to_unevictable_list(page);
-		mem_cgroup_move_lists(page, LRU_UNEVICTABLE);
 	}
 
 	mem_cgroup_move_lists(page, lru);


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