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Message-ID: <20070502174940.GA9089@one.firstfloor.org>
Date: Wed, 2 May 2007 19:49:40 +0200
From: Andi Kleen <andi@...stfloor.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andi Kleen <andi@...stfloor.org>,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
linux-kernel@...r.kernel.org, rusty@...tcorp.com.au, wfg@...c.edu
Subject: Re: 2.6.22 -mm merge plans
On Wed, May 02, 2007 at 09:47:07AM -0700, Andrew Morton wrote:
> On Wed, 2 May 2007 12:44:13 +0200 Andi Kleen <andi@...stfloor.org> wrote:
>
> > > It is currently used as an instrumentation infrastructure for the LTTng
> > > tracer at IBM, Google, Autodesk, Sony, MontaVista and deployed in
> > > WindRiver products. The SystemTAP project also plan to use this type of
> > > infrastructure to trace sites hard to instrument. The Linux Kernel
> > > Markers has the support of Frank C. Eigler, author of their current
> > > marker alternative (which he wishes to drop in order to adopt the
> > > markers infrastructure as soon as it hits mainline).
> >
> > All of the above don't use mainline kernels.
>
> That's because they have to add a markers patch!
I meant they use very old kernels. Their experiences don't apply
to mainline bitrottyness.
> > That doesn't constitute using it.
>
> Andi, there was a huge amount of discussion about all this in September last
> year (subjects: *markers* and *LTTng*). The outcome of all that was, I
> believe, that the kernel should have a static marker infrastructure.
I have no problem with that in principle; just some doubts about
the current proposed implementation: in particular its complexity.
And also I think when something is merged it should have some users in tree.
-Andi
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