linux-kernel - Re: LTTng kernel integration roadmap, update

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Message-ID: <20081125082414.GA28031@infradead.org>
Date:	Tue, 25 Nov 2008 03:24:14 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Christoph Hellwig <hch@...radead.org>,
	ltt-dev@...ts.casi.polymtl.ca, Zhaolei <zhaolei@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, Sam Ravnborg <sam@...nborg.org>
Subject: Re: LTTng kernel integration roadmap, update

On Mon, Nov 24, 2008 at 07:20:55AM -0500, Mathieu Desnoyers wrote:
> The key idea behind this is to answer to Thomas Gleixner concerns, who
> supports that a tracer should output data in text-format only so it can
> be used with tools kernel developers have on their system, like "cat".

Last time I talked to Thomas and others it wasn't "text only" but text
also in that you can just cat a debugfs file for simple tracing.  And I
totally agree with that.  If you don't trace too much that's absolutely
enough.  It's not enough for large traces on highly loaded enterprise
or high-end embedded systems or things like flight recorder tracing, but
for those requiring an external viewer is just fine.

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