linux-kernel - Re: Next patches for the 2.6.25 queue

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Message-ID: <20071213221805.GA27960@Krystal>
Date:	Thu, 13 Dec 2007 17:18:06 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: Next patches for the 2.6.25 queue

* Andrew Morton (akpm@...ux-foundation.org) wrote:
> On Thu, 13 Dec 2007 09:46:42 -0500
> Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> 
> > Hi Andrew,
> > 
> > I would like to post my next patches in a way that would make it as
> > easy for you and the community to review them. Currently, the patches
> > that have really settled down are :
> > 
> > * For 2.6.25
> > 
> > - Text Edit Lock
> >   - Looks-good-to Ingo Molnar.
> > - Immediate Values
> >   - Redux version, asked by Rusty
> > 
> > * For 2.6.25 ?
> > 
> > Another patchset that is technically ok (however Rusty dislikes the
> > complexity inherent to the algorithms required to be reentrant wrt NMI
> > and MCE, although it's been reviewed by the community for months). I
> > have also replyed to Ingo's concerns about effeciency of my approach
> > compared to dtrace by providing numbers, but he has not replyed yet.
> > http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg238317.html
> > 
> > - Markers use Immediate Values
> > 
> > * Maybe for 2.6.26 ...
> > 
> > Once we have this, and the instrumentation (submitted as RFC in the past
> > weeks), in the kernel, the only architecture dependent element that will
> > be left is the LTTng timestamping code.
> > 
> > And then, from that point, the following patchset is mostly
> > self-contained and stops modifying code all over the kernel tree. It
> > is the LTTng tracer.
> > 
> > Trying to improve my approach : I guess that submitting at most 15
> > patches at a time (each 1-2 days), against the -mmotm tree, would be the
> > way to do it ?
> > 
> 
> Just for some context, I have...
> 
> - 1,400-odd open bugzilla reports
> 
> - 719 emails saved away in my emailed-bug-reports folder, all of which
>   need to be gone through, asking originators to retest and
>   re-report-if-unfixed.
> 
> - A big ugly email titled "2.6.24-rc5-git1: Reported regressions from
>   2.6.23" in my inbox.
> 
> All of which makes it a bit inappropriate to be thinking about
> intrusive-looking new features.
> 
> Ho hum.  Just send me the whole lot against rc5-mm1 and I'll stick it in
> there and we'll see what breaks.
> 

Ok,

Hum, the "whole lot" : including or excluding
- instrumentation
- the LTTng tracer ?

I realise that you have a lot of other things on your mind. One of my
goals would be to get LTTng in the -mm tree so it could help you resolve
these bugs. But on the other hand, I don't want to rush things. The
LTTng tracer could benefit of another round of RFC before it is ready
for prime time, but it would definitely be useful as-is in the mm tree.

Mathieu


-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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