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

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Message-Id: <1247217548.771.10.camel@penberg-laptop>
Date:	Fri, 10 Jul 2009 12:19:08 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Janboe Ye <yuan-bo.ye@...orola.com>,
	linux-kernel@...r.kernel.org, vegard.nossum@...il.com,
	graydon@...hat.com, fche@...hat.com, Nick Piggin <npiggin@...e.de>,
	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, Ingo Molnar wrote:
> > > SLAB is (slowly) going away so you might want to port this to SLUB 
> > > as well so we can merge both.
> > 
> > and SLQB which will replace both? :-/

On Fri, 2009-07-10 at 02:04 -0700, David Rientjes wrote:
> I'm not sure what the status of slqb is, although I would have expected it 
> to have been pushed for inclusion in 2.6.31 as a slab allocator 
> alternative.  Nick, any forecast for inclusion?

2.6.32 most likely. Nick has fixed a bunch of problems but there's still
one ppc boot time bug that's turning out to be hard to find.

On Fri, 2009-07-10 at 02:04 -0700, David Rientjes wrote:
> SLUB has a pretty noticeable performance degradation on benchmarks such as 
> netperf TCP_RR with high numbers of threads (see my post about it: 
> http://marc.info/?l=linux-kernel&m=123839191416472).  CONFIG_SLAB is the 
> optimal configuration for workloads that share similiar slab thrashing 
> patterns (which my patchset dealt with in an indirect way and yet still 
> didn't match slab's performance).  I haven't yet seen data that suggests 
> anything other than CONFIG_SLAB has parity with such a benchmark.

As I said before, I'm interesting in getting those patches merged. I
think Christoph raised some issues that need to be take care of before
we can do that, no?

			Pekka

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