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

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Message-ID: <20080731141134.GP23938@one.firstfloor.org>
Date:	Thu, 31 Jul 2008 16:11:34 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <clameter@....com>,
	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

> Finally getting rid of SLAB is a much trickier proposition because SLUB
> still loses in a few important corner cases.

The big issue is that we haven't really made much progress on at least
some of these test cases (like the database benchmarks) for quite some
time (and that wasn't for a lack of trying) :-/ Might be a fundamental
problem.

-Andi
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