linux-kernel - Re: [PATCH 6/7] mm: compaction: Perform a faster migration scan when migrating asynchronously

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Message-ID: <20101201103154.GO15564@cmpxchg.org>
Date:	Wed, 1 Dec 2010 11:31:54 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] mm: compaction: Perform a faster migration scan when
 migrating asynchronously

On Mon, Nov 22, 2010 at 03:43:54PM +0000, Mel Gorman wrote:
> try_to_compact_pages() is initially called to only migrate pages asychronously
> and kswapd always compacts asynchronously. Both are being optimistic so it
> is important to complete the work as quickly as possible to minimise stalls.
> 
> This patch alters the scanner when asynchronous to only consider
> MIGRATE_MOVABLE pageblocks as migration candidates. This reduces stalls
> when allocating huge pages while not impairing allocation success rates as
> a full scan will be performed if necessary after direct reclaim.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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