From 16fb951237c2b0b28037b992ee44e7ee401c30d1 Mon Sep 17 00:00:00 2001
From: Shaohua Li <shaohua.li@intel.com>
Date: Mon, 31 Oct 2011 17:08:02 -0700
Subject: vmscan: count pages into balanced for zone with good watermark

It's possible a zone watermark is ok when entering the balance_pgdat()
loop, while the zone is within the requested classzone_idx.  Count pages
from this zone into `balanced'.  In this way, we can skip shrinking zones
too much for high order allocation.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/vmscan.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'mm')

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a297603d35bc..77ee24fc891a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2748,6 +2748,8 @@ out:
 
 			/* If balanced, clear the congested flag */
 			zone_clear_flag(zone, ZONE_CONGESTED);
+			if (i <= *classzone_idx)
+				balanced += zone->present_pages;
 		}
 	}
 
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