linux-kernel - Re: [PATCH] tracing/markers: make markers select tracepoints

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Message-ID: <20090223085243.GF9582@elte.hu>
Date:	Mon, 23 Feb 2009 09:52:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, "Frank Ch. Eigler" <fche@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] tracing/markers: make markers select tracepoints


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> * Ingo Molnar (mingo@...e.hu) wrote:
> > 
> > * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> > 
> > > > > so I wonder why don't we create linux-tracing new mailing 
> > > > > list.
> > 
> > Discussions related to upstream Linux tracing are generally 
> > conducted on lkml.
> > 
> > > > Yes, lets hide it from general view, sounds like a brilliant 
> > > > plan.
> > > 
> > > I guess Kosaki's point is that there may be a disconnect 
> > > between the work that is done on the LTTng side and the ftrace 
> > > side. [...]
> > 
> > Could you please list the items we need to extend the tracing 
> > framework in kernel/tracing/* with so that we can support the 
> > aspects of LTTng you consider important and upstream-worthy?
> > 
> > As i've mentioned it in the past, i'm definitely interested in 
> > helping such an effort to further improve Linux tracing.
> > 
> > 	Ingo
> 
> Hi Ingo,
> 
> I have not merged the "binary trace buffer to ascii" code done 
> by Fujitsu yet because I still have to review it, but when 
> it's ready, I will be ready to post everything that has been 
> identified as wish list for a tracer v2. It includes a very 
> generic buffering infrastructure which have been evolving for 
> the past 4 years (and reviewed on LKML a couple of times in 
> the past).
> 
> So, either I start to merge this last feature, or I can start 
> posting right away without the "binary buffer to ascii" 
> module. The standard mechanism used in LTTng is binary-only, 
> very high speed, and uses a userspace application to transform 
> binary data into text.
> 
> That will let us figure out what overlaps between ftrace and 
> LTTng and find out how those two can fit together.
> 
> Note that for the moment, LTTng sits in the /ltt directory of 
> the kernel tree, so even if we have both tracers at some 
> point, we should not step on each other's foot. That could let 
> us room to figure out how to incrementally combine those 
> tracers if that makes sense.

I think you got me wrong Mathieu. The way to combine those two 
tracers is to do it _before_ it gets merged upstream. We 
obviously dont want to parallel tracing frameworks in the 
upstream kernel.

So ... please lets work on that, okay?

	Ingo
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