linux-kernel - Re: [patch 10/21] buffer heads: Support slab defrag

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Message-ID: <Pine.LNX.4.64.0805190942530.18431@schroedinger.engr.sgi.com>
Date:	Mon, 19 May 2008 09:44:11 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Chinner <dgc@....com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	andi@...stfloor.org, Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>, mpm@...enic.com
Subject: Re: [patch 10/21] buffer heads: Support slab defrag

On Mon, 19 May 2008, David Chinner wrote:

> Defragmentation is triggered as part of the usual memory reclaim
> process. Which implies we've run out of free memory, correct?

Yes but we have already reclaimed some memory.

> > How do you trigger such a special writeout?
> 
> filemap_fdatawrite_range() perhaps?

Could you provide me such a patch? I would not know how much to writeout. 
If we had such a method then we could also use that for the swap case 
where we also write out single pages?
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