linux-kernel - Re: -mm merge plans -- anti-fragmentation

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Message-Id: <1184065445.5281.16.camel@lappy>
Date:	Tue, 10 Jul 2007 13:04:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Mel Gorman <mel@...net.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, npiggin@...e.de,
	kenchen@...gle.com, jschopp@...tin.ibm.com, apw@...dowen.org,
	kamezawa.hiroyu@...fujitsu.com, y-goto@...fujitsu.com,
	clameter@....com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: -mm merge plans -- anti-fragmentation

On Tue, 2007-07-10 at 11:20 +0100, Mel Gorman wrote:

<snip>

> > lumpy-reclaim-v4.patch
> 
> This patch is really what lumpy reclaim is. I believe Peter has looked
> at this and was happy enough at the time although he is cc'd here again
> in case this has changed. This is mainly useful with either grouping
> pages by mobility or the ZONE_MOVABLE stuff. However, at the time the
> patch was proposed, there was a feeling that it might help jumbo frame
> allocation on e1000's and maybe if fsblock optimistically uses
> contiguous pages it would have an application. I would like to see it go
> through to see does it help e1000 at least.

I'm not seeing how this will help e1000 (and other jumbo drivers). They
typically allocate using GFP_ATOMIC, so in order to satisfy those you'd
need to either have a higher order watermark or do atomic defrag of the
free space.


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