linux-kernel - Re: [RFC PATCH] greatly reduce SLOB external fragmentation

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Date:	Thu, 31 Jul 2008 10:42:40 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	Ingo Molnar <mingo@...e.hu>, 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>,
	vegard.nossum@...il.com, hannes@...urebad.de
Subject: Re: [RFC PATCH] greatly reduce SLOB external fragmentation

Matt Mackall wrote:
> On Thu, 2008-07-31 at 09:26 -0500, Christoph Lameter wrote:
>> Matt Mackall wrote:
>>
>>> Finally getting rid of SLAB is a much trickier proposition because SLUB
>>> still loses in a few important corner cases.
>> Which corner cases? I know about the reports on the TPC issue which I
>> guess is a result of the avoidance of queueing in the cold free case.
>> It would be good to have a small C program (under an open source
>> license) that shows the issue.
> 
> That's the one I had in mind, which I have no personal insight into.

I also only so far had to rely on reports by others and guesswork as to what is going on.


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