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: <20101114144155.E01F.A69D9226@jp.fujitsu.com>
Date:	Sun, 14 Nov 2010 14:43:12 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrea Arcangeli <aarcange@...hat.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;

In all other place, heavy reclaim detection are used folliowing.

	if (priority < DEF_PRIORITY - 2)


So, "priority >= DEF_PRIORITY - 2" is more symmetric, I think. but if you have strong
reason, I don't oppse.



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