linux-kernel - Re: [patch 09/19] (NEW) more aggressively use lumpy reclaim

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Message-ID: <20080114152853.GB20551@csn.ul.ie>
Date:	Mon, 14 Jan 2008 15:28:53 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <clameter@....com>
Cc:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 09/19] (NEW) more aggressively use lumpy reclaim

On (08/01/08 14:30), Christoph Lameter didst pronounce:
> On Tue, 8 Jan 2008, Rik van Riel wrote:
> 
> > If normal pageout does not result in contiguous free pages for
> > kernel stacks, fall back to lumpy reclaim instead of failing fork
> > or doing excessive pageout IO.
> 
> Good. Ccing Mel. This is going to help higher order pages which is useful 
> for a couple of other projects.
> 

Well, the patch only has any impact when the order you are reclaiming is
less than PAGE_ALLOC_COSTLY_ORDER so I would not have considered it of major
impact to other projects interested in high order allocations.  However, in
isolation I have no problem with this patch and I can see how it makes sense
for the problem scenario described. I rebased just this patch to 2.6.24-rc7
and found no problems but I have not had the chance to review the whole set.

> Reviewed-by: Christoph Lameter <clameter@....com>
> 

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

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