linux-kernel - Re: [PATCH 3/3] mm,vmscan: Reclaim order-0 and compact instead of lumpy reclaim when under light pressure

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Message-ID: <20101112093742.GA3537@csn.ul.ie>
Date:	Fri, 12 Nov 2010 09:37:43 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm,vmscan: Reclaim order-0 and compact instead of
	lumpy reclaim when under light pressure

On Thu, Nov 11, 2010 at 07:07:04PM +0000, Mel Gorman wrote:
> +	if (COMPACTION_BUILD)
> +		sc->lumpy_reclaim_mode = LUMPY_MODE_COMPACTION;
> +	else
> +		sc->lumpy_reclaim_mode = LUMPY_MODE_CONTIGRECLAIM;
>  

Gack, I posted the slightly wrong version. This version prevents lumpy
reclaim ever being used. The figures I posted were for a patch where
this condition looked like

        if (COMPACTION_BUILD && priority > DEF_PRIORITY - 2)
                sc->lumpy_reclaim_mode = LUMPY_MODE_COMPACTION;
        else
                sc->lumpy_reclaim_mode = LUMPY_MODE_CONTIGRECLAIM;

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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