From: Shaohua Li <shaohua.li@intel.com>
Date: Wed, 5 Oct 2011 00:42:55 +0000 (+1100)
Subject: vmscan: count pages into balanced for zone with good watermark
X-Git-Tag: next-20111011~1^2~194
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=045a68be655560b3f5440a423e7258847a866c24;p=karo-tx-linux.git

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>
---

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;
 		}
 	}