linux-kernel - Re: [PATCH] procfs: provide slub's /proc/slabinfo

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Message-Id: <1199641910.8215.28.camel@cinder.waste.org>
Date:	Sun, 06 Jan 2008 11:51:50 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <clameter@....com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>,
	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	zanussi@...ibm.com
Subject: Re: [PATCH] procfs: provide slub's /proc/slabinfo


On Sat, 2008-01-05 at 18:21 +0200, Pekka J Enberg wrote:
> Hi Matt,
> 
> On Thu, 3 Jan 2008, Matt Mackall wrote:
> > >  SLUB can align these without a 2 byte 
> > > overhead. In some configurations this results in SLUB using even less 
> > > memory than SLOB. See f.e. Pekka's test at 
> > > http://marc.info/?l=linux-kernel&m=118405559214029&w=2
> > 
> > Available memory after boot is not a particularly stable measurement and
> > not valid if there's memory pressure. At any rate, I wasn't able to
> > reproduce this.
> 
> So, I have this silly memory profiler derived from the kleak patches by 
> the relayfs people and would love to try it out on an embedded workload 
> where SLUB memory footprint is terrible. Any suggestions?

Or you could use this (which is a bit broken on modern kernels, but
provides lots of interesting detail):

http://lwn.net/Articles/124374/

I don't have any particular "terrible" workloads for SLUB. But my
attempts to simply boot with all three allocators to init=/bin/bash in,
say, lguest show a fair margin for SLOB.

-- 
Mathematics is the supreme nostalgia of our time.

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