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

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Message-ID: <20080520225341.GH27853@shareable.org>
Date:	Tue, 20 May 2008 23:53:41 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	David Chinner <dgc@....com>
Cc:	Christoph Lameter <clameter@....com>, 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

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

I don't think that's true on no-MMU.  Defragmentation can be needed
often on no-MMU when there's lots of free memory, just in the wrong
places.

-- Jamie
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