linux-kernel - Re: [RFC][PATCH] Check write to slab memory which freed already using mudflap

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Message-Id: <1247219506.771.22.camel@penberg-laptop>
Date:	Fri, 10 Jul 2009 12:51:46 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Nick Piggin <npiggin@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	linux-kernel@...r.kernel.org, vegard.nossum@...il.com,
	fche@...hat.com, cl@...ux-foundation.org
Subject: Re: [RFC][PATCH] Check write to slab memory which freed already
 using mudflap

Hi David,

On Fri, 10 Jul 2009, Pekka Enberg wrote:
> > I'm not sure it's such a hard decision. SLAB is on it's way out because
> > SLUB and SLQB code are much cleaner and the debugging support is better.

On Fri, 2009-07-10 at 02:47 -0700, David Rientjes wrote:
> I don't think that is good enough reason.  CONFIG_SLAB is by far the 
> optimal choice for netperf TCP_RR on >= 16 cpus and pushing it out of the 
> tree, even though it is no longer the default option, isn't an option for 
> those of us who live by performance even if it comes at the cost of a 
> dirtier implementation (enhanced debugging support doesn't even register 
> on my radar since it's useless in a production environment).

Hey, I said SLAB is on its way out (yes, it really is). But I didn't say
we're going to blindly remove it if performs better than the
alternatives. I don't see any reason why SQLB can't reach the same
performance as SLAB after on fundamental level, though. Can you?

			Pekka

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