linux-kernel - Re: [patch] SLQB slab allocator

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Message-ID: <84144f020901140730l747b4e06j41fb8a35daeaf6c8@mail.gmail.com>
Date:	Wed, 14 Jan 2009 17:30:48 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Nick Piggin" <npiggin@...e.de>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	"Lin Ming" <ming.m.lin@...el.com>,
	"Christoph Lameter" <cl@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: Re: [patch] SLQB slab allocator

Hi Nick,

On Wed, Jan 14, 2009 at 5:22 PM, Nick Piggin <npiggin@...e.de> wrote:
> And... IIRC, the Intel guys did make a stink but it wasn't considered
> so important or worthwhile to fix for some reason? Anyway, the fact is
> that it hadn't been fixed in SLUB. Hmm, I guess it is a significant
> failure of SLUB that it hasn't managed to replace SLAB by this point.

Again, not speaking for Christoph, but *I* do consider the regression
to be important and I do want it to be fixed. I have asked for a test
case to reproduce the regression and/or oprofile reports but have yet
to receive them. I did fix one regression I saw with the fio benchmark
but unfortunately it wasn't the same regression the Intel guys are
hitting. I suppose we're in limbo now because the people who are
affected by the regression can simply turn on CONFIG_SLAB.

In any case, I do agree that the inability to replace SLAB with SLUB
is a failure on the latter. I'm just not totally convinced that it's
because the SLUB code is unfixable ;).

                                Pekka
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