linux-kernel - Re: [PATCH 1/2] kmemcheck v3

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Message-ID: <20080208121012.GF4745@one.firstfloor.org>
Date:	Fri, 8 Feb 2008 13:10:12 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Richard Knutsson <ricknu-0@...dent.ltu.se>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH 1/2] kmemcheck v3

On Fri, Feb 08, 2008 at 01:31:44PM +0200, Pekka Enberg wrote:
> Hi Andi,
> 
> On Feb 8, 2008 1:55 PM, Andi Kleen <andi@...stfloor.org> wrote:
> > Impressive patch! On the other hand a lot of the interesting
> > data isn't it kmalloc anymore, but in slab. Does it really track
> > all that much?
> 
> It tracks all slab caches. What we're not tracking is pages from the

I see.

> page allocator that are directly used by callers. We had some
> discussion of this already and we definitely want to extend it to
> cover that too later on.

It's probably tricky; there are all kinds of hidden page faults
on x86 on data structures allocated as pages (e.g. GDT, LDT [which
is sometimes kmalloc too], stack etc.) 

-Andi
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