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

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Message-ID: <20080812154334.GA18581@Krystal>
Date:	Tue, 12 Aug 2008 11:43:34 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>,
	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.

* Eduard - Gabriel Munteanu (eduard.munteanu@...ux360.ro) wrote:
> 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.
> 

The markers present in mainline kernel does not use immediate values.
However, immediate values in tip does implement a load
immediate/test/branch for x86, x86_64 and powerpc. I also have support
for sparc64 in my lttng tree.

Mathieu


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Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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