linux-kernel - Re: [PATCH v3 -mm 1/3] mm: reclaim at order 0 when compaction is enabled

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Date:	Mon, 30 Jan 2012 10:36:13 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH v3 -mm 1/3] mm: reclaim at order 0 when compaction is
 enabled

On Thu, Jan 26, 2012 at 02:59:14PM -0500, Rik van Riel wrote:
> When built with CONFIG_COMPACTION, kswapd should not try to free
> contiguous pages, because it is not trying hard enough to have
> a real chance at being successful, but still disrupts the LRU
> enough to break other things.
> 
> Do not do higher order page isolation unless we really are in
> lumpy reclaim mode.
> 
> Stop reclaiming pages once we have enough free pages that
> compaction can deal with things, and we hit the normal order 0
> watermarks used by kswapd.
> 
> Also remove a line of code that increments balanced right before
> exiting the function.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>

Acked-by: Mel Gorman <mel@....ul.ie>

-- 
Mel Gorman
SUSE Labs
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