linux-kernel - Re: [PATCH 4/5] kmemtrace: SLUB hooks.

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Message-ID: <20080812152954.GB5973@localhost>
Date:	Tue, 12 Aug 2008 18:29:54 +0300
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	mathieu.desnoyers@...ymtl.ca, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, rdunlap@...otime.net,
	mpm@...enic.com, rostedt@...dmis.org, tglx@...utronix.de
Subject: Re: [PATCH 4/5] kmemtrace: SLUB hooks.

On Mon, Aug 11, 2008 at 05:22:37PM +0300, Pekka Enberg wrote:
> On Mon, 2008-08-11 at 09:21 -0500, Christoph Lameter wrote:
> > Pekka Enberg wrote:
> > 
> > > The function call is supposed to go away when we convert kmemtrace to
> > > use Mathieu's markers but I suppose even then we have a problem with
> > > inlining?
> > 
> > The function calls are overwritten with NOPs? Or how does that work?
> 
> I have no idea. Mathieu, Eduard?

Yes, the code is patched at runtime. But AFAIK markers already provide
this stuff (called "immediate values"). Mathieu's tracepoints also do
it. But it's not available on all arches. x86 and x86-64 work as far as
I remember.

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