linux-kernel - Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches

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Message-ID: <4880CF52.5020406@linux-foundation.org>
Date:	Fri, 18 Jul 2008 12:13:54 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Richard Kennedy <richard@....demon.co.uk>
CC:	penberg@...helsinki.fi, mpm@...enic.com,
	linux-mm <linux-mm@...ck.org>,
	lkml <linux-kernel@...r.kernel.org>, Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH][RFC] slub: increasing order reduces memory usage of	some
 key caches

Richard Kennedy wrote:
> On Fri, 2008-07-18 at 09:55 -0500, Christoph Lameter wrote:
>> OK that is now 4215 pages before and 4112 after the patch? Yawn.... So barely any effect?
> 
> Well it's not huge but there's another 100+ pages out of radix_tree,
> too. & I've not inspected the rest of the cache usage.

Can you post these numbers with the slabinfo for the radix tree as well? It may be that there are a lot of sparsely populated slab pages that waste memory.





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