From 3962e6cacb0d23b4991f2831ec6851a7beb1dd2c Mon Sep 17 00:00:00 2001
From: Shaohua Li <shaohua.li@intel.com>
Date: Wed, 5 Oct 2011 11:42:55 +1100
Subject: [PATCH] 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>
---
 mm/vmscan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 20b685267edd..f4e9adf69bca 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2749,6 +2749,8 @@ out:
 
 			/* If balanced, clear the congested flag */
 			zone_clear_flag(zone, ZONE_CONGESTED);
+			if (i <= *classzone_idx)
+				balanced += zone->present_pages;
 		}
 	}
 
-- 
2.39.5