linux-kernel - Re: [PATCH/RFC] MM slub: add a sysfs entry to show the calculated number of fallback slabs

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Message-ID: <alpine.DEB.2.00.1011120911310.11746@router.home>
Date:	Fri, 12 Nov 2010 09:13:40 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Richard Kennedy <richard@....demon.co.uk>
cc:	Pekka Enberg <penberg@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH/RFC] MM slub: add a sysfs entry to show the calculated
 number of fallback slabs

On Fri, 12 Nov 2010, Richard Kennedy wrote:

> On my desktop workloads (kernel compile etc) I'm seeing surprisingly
> little slab fragmentation. Do you have any suggestions for test cases
> that will fragment the memory?

Do a massive scan through huge amounts of files that triggers inode and
dentry reclaim?

> + * Note that this can give the wrong answer if the user has changed the
> + * order of this slab via sysfs.

Not good. Maybe have an additional counter in kmem_cache_node instead?
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