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

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Date:	Wed, 16 Jul 2008 15:30:57 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Christoph Lameter <cl@...ux-foundation.org>
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


On Wed, 2008-07-16 at 09:03 -0500, Christoph Lameter wrote:
> Richard Kennedy wrote:
> 
> > before
> > dentry             82136  82137    208   19    1 : tunables    0    0    0 : slabdata   4323   4323      0
> > after
> > dentry             79482  79482    208   39    2 : tunables    0    0    0 : slabdata   2038   2038      0
> 
> 19 objects with an order 1 alloc and 208 byte size? Urgh. 8192/208 = 39 and not 19.
> 
> Kmemcheck or something else active? We seem to be loosing 50% of our memory.
> 
> Pekka: Is the slabinfo emulation somehow broken?
> 
> I'd really like to see the output of slabinfo dentry.
> 
/proc/slabinfo says it shows pages/slab not order -- so the numbers are consistent if nothing else.

I'm getting the log message 
> SLUB: increasing order dentry->[1] [208]
from my code, so it looks correct. It's just the standard code is
picking order 0.

I'm just rebuilding the kernel & will get you that slabinfo

Richard 

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