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

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Date:	Fri, 15 Sep 2006 16:00:09 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Andrew Morton <akpm@...l.org>
Cc:	tglx@...utronix.de, karim@...rsys.com,
	Paul Mundt <lethal@...ux-sh.org>, Jes Sorensen <jes@....com>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

* Andrew Morton (akpm@...l.org) wrote:
> Of course, it they are properly designed, the one set of tracepoints could
> be used by different tracing backends - that allows us to separate the
> concepts of "tracepoints" and "tracing backends".

If I try to develop your idea a little further, we could this of dividing the
tracing problem into four layers :

- tracepoints (where the code is instrumented)
  - identifying code
  - accessing data surrounding the code
- tracing backend (how to add the tracepoints)
- tracing infrastructure (what code will serialize the information)
- data extraction (getting the data out to disk, network, ...)

I think that, if we agree on this segmentation of the problem, this thread is
generally debating on the tracing backends and their respective limitations.
I just want to point out that the patch I have submitted adresses mainly the
"tracing infrastructure" and "data extraction" topics.

Regards,

Mathieu


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