From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, Mel Gorman <mel@skynet.ie>,
andi@firstfloor.org, Rik van Riel <riel@redhat.com>,
mpm@selenic.com, Dave Chinner <david@fromorbit.com>
Subject: Re: [patch 00/19] Slab Fragmentation Reduction V14
Date: Tue, 12 Aug 2008 09:50:07 +0300 [thread overview]
Message-ID: <48A1329F.6000602@cs.helsinki.fi> (raw)
In-Reply-To: <20080811150616.207532384@quilx.com>
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!
prev parent reply other threads:[~2008-08-12 6:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-11 15:06 [patch 00/19] Slab Fragmentation Reduction V14 Christoph Lameter
2008-08-11 15:06 ` [patch 01/19] slub: Add defrag_ratio field and sysfs support Christoph Lameter
2008-08-13 0:40 ` Greg KH
2008-08-11 15:06 ` [patch 02/19] slub: Replace ctor field with ops field in /sys/slab/* Christoph Lameter
2008-08-11 15:06 ` [patch 03/19] slub: Add get() and kick() methods Christoph Lameter
2008-08-11 15:06 ` [patch 04/19] slub: Sort slab cache list and establish maximum objects for defrag slabs Christoph Lameter
2008-08-11 15:06 ` [patch 05/19] slub: Slab defrag core Christoph Lameter
2008-08-11 15:06 ` [patch 06/19] slub: Add KICKABLE to avoid repeated kick() attempts Christoph Lameter
2008-08-11 15:06 ` [patch 07/19] slub: Extend slabinfo to support -D and -F options Christoph Lameter
2008-08-11 15:06 ` [patch 08/19] slub/slabinfo: add defrag statistics Christoph Lameter
2008-08-11 15:06 ` [patch 09/19] slub: Trigger defragmentation from memory reclaim Christoph Lameter
2008-08-11 15:06 ` [patch 10/19] buffer heads: Support slab defrag Christoph Lameter
2008-08-11 15:06 ` [patch 11/19] inodes: Support generic defragmentation Christoph Lameter
2008-08-11 15:06 ` [patch 12/19] Filesystem: Ext2 filesystem defrag Christoph Lameter
2008-08-11 15:06 ` [patch 13/19] Filesystem: Ext3 " Christoph Lameter
2008-08-11 15:06 ` [patch 14/19] Filesystem: Ext4 " Christoph Lameter
2008-08-11 15:06 ` [patch 15/19] Filesystem: XFS slab defragmentation Christoph Lameter
2008-08-12 0:20 ` Dave Chinner
2008-08-12 7:08 ` Pekka Enberg
2008-08-12 18:21 ` Christoph Lameter
2008-08-13 6:38 ` Pekka Enberg
2008-08-11 15:06 ` [patch 16/19] Filesystem: /proc filesystem support for slab defrag Christoph Lameter
2008-08-11 15:06 ` [patch 17/19] Filesystem: Slab defrag: Reiserfs support Christoph Lameter
2008-08-11 15:06 ` [patch 18/19] dentries: Add constructor Christoph Lameter
2008-08-13 7:12 ` Pekka Enberg
2008-08-11 15:06 ` [patch 19/19] dentries: dentry defragmentation Christoph Lameter
2008-08-12 6:50 ` Pekka Enberg [this message]
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