linux-kernel - Re: [patch 00/19] Slab Fragmentation Reduction V14

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Message-ID: <48A1329F.6000602@cs.helsinki.fi>
Date:	Tue, 12 Aug 2008 09:50:07 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <cl@...ux-foundation.org>
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>,
	mpm@...enic.com, Dave Chinner <david@...morbit.com>
Subject: Re: [patch 00/19] Slab Fragmentation Reduction V14

Christoph Lameter wrote:
> V13->V14
> - Rediff against linux-next on request of Andrew
> - TestSetPageLocked -> trylock_page conversion.
> 
> Slab fragmentation is mainly an issue if Linux is used as a fileserver
> and large amounts of dentries, inodes and buffer heads accumulate. In some
> load situations the slabs become very sparsely populated so that a lot of
> memory is wasted by slabs that only contain one or a few objects. In
> extreme cases the performance of a machine will become sluggish since
> we are continually running reclaim without much succes.
> Slab defragmentation adds the capability to recover the memory that
> is wasted.

Applied, thanks!
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