linux-kernel - [PATCH 2/5] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact

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Date:	Fri, 18 Nov 2011 16:58:41 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Linux-MM <linux-mm@...ck.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>, Jan Kara <jack@...e.cz>,
	Andy Isaacson <adi@...apodia.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/5] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory

When asynchronous compaction was introduced, the
/proc/sys/vm/compact_memory handler should have been updated to always
use synchronous compaction. This did not happen so this patch addresses
it. The assumption is if a user writes to /proc/sys/vm/compact_memory,
they are willing for that process to stall.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/compaction.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 237560e..615502b 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -666,6 +666,7 @@ static int compact_node(int nid)
 			.nr_freepages = 0,
 			.nr_migratepages = 0,
 			.order = -1,
+			.sync = true,
 		};
 
 		zone = &pgdat->node_zones[zoneid];
-- 
1.7.3.4

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