From 27acc9e5757f40f357c3c50b4d30f55f908bc7dc Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@suse.de>
Date: Fri, 28 Jun 2013 09:51:29 +1000
Subject: [PATCH] mm: vmscan: set zone flags before blocking

In shrink_page_list a decision may be made to stall and flag a zone as
ZONE_WRITEBACK so that if a large number of unqueued dirty pages are
encountered later then the reclaimer will stall.  Set ZONE_WRITEBACK
before potentially going to sleep so it is noticed sooner.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Cc: Zlatko Calusic <zcalusic@bitsync.net>
Cc: dormando <dormando@rydia.net>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5b1a79c8f0cb..5f80d018bffa 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1445,8 +1445,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	 */
 	if (nr_writeback && nr_writeback >=
 			(nr_taken >> (DEF_PRIORITY - sc->priority))) {
-		wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
 		zone_set_flag(zone, ZONE_WRITEBACK);
+		wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
 	}
 
 	/*
-- 
2.39.5