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: <20101115091719.GD27362@csn.ul.ie>
Date:	Mon, 15 Nov 2010 09:17:19 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	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 Sun, Nov 14, 2010 at 02:43:12PM +0900, KOSAKI Motohiro wrote:
> > 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.
> 

I had no strong reason other than "I don't want lumpy reclaim to be used
easily". I will match the other places. Thanks

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