From: Shaohua Li <shaohua.li@intel.com>
Date: Wed, 24 Aug 2011 23:47:04 +0000 (+1000)
Subject: It's possible a zone watermark is ok when entering the balance_pgdat()
X-Git-Tag: next-20110905~1^2~72
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=86d1c7fcddc3b6d06a36cb64f8e733e179c76d7c;p=karo-tx-linux.git

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 c9a97ac0d554..0ba2b502c474 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2761,6 +2761,8 @@ out:
 
 			/* If balanced, clear the congested flag */
 			zone_clear_flag(zone, ZONE_CONGESTED);
+			if (i <= *classzone_idx)
+				balanced += zone->present_pages;
 		}
 	}