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Re: (forw) [ Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108]

Mathieu Desnoyers wrote:

I just posted a reduced LTTng-core version of my tracer to LKML (without any
instrumentation, trying to get only the tracer core). However, Ingo seems use
SystemTAP as an example against the introduction of a united tracer core in the
Linux kernel.

I though that you would probably like to tell SystemTAP's point of view on that
matter publicly.



Hi Mathieu,

Thanks for the headup on posting of the LTTng-core patches on LKML. I am reading through the threads on LTTng right now.


----- Forwarded message from Ingo Molnar <> -----

Date: Thu, 14 Sep 2006 13:27:18 +0200
To: Mathieu Desnoyers <>
Cc:, Christoph Hellwig <>,
	Andrew Morton <>, Ingo Molnar <>,
	Greg Kroah-Hartman <>,
	Thomas Gleixner <>,
	Tom Zanussi <>,,
	Michel Dagenais <>
User-Agent: Mutt/
From: Ingo Molnar <>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

* Mathieu Desnoyers <> wrote:

Following an advice Christoph gave me this summer, submitting a smaller, easier to review patch should make everybody happier. Here is a stripped down version of LTTng : I removed everything that would make the code review reluctant (especially kernel instrumentation and kernel state dump module). I plan to release this "core" version every few LTTng releases and post it to LKML.

Comments and reviews are very welcome.

i have one very fundamental question: why should we do this source-intrusive method of adding tracepoints instead of the dynamic, unintrusive (and thus zero-overhead) KProbes+SystemTap method?


----- End forwarded message -----
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