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

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Date:	Mon, 18 Sep 2006 10:46:58 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Jes Sorensen <jes@....com>
Cc:	karim@...rsys.com, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de,
	Paul Mundt <lethal@...ux-sh.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	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

Hi Jes,

* Jes Sorensen (jes@....com) wrote:
> Everything has performance limitations, you keep running around touting
> that static is the only thing thats not a problem. Now show us the
> numbers!
> 

If I may : I showed in a precedent thread that kprobes impact doubled LTTng's
impact on the system. If you are interested in numbers about LTTng, here they
are :

"The LTTng tracer : A Low Impact Performance and Behavior Monitor for GNU/Linux"
(OLS2006)
http://ltt.polymtl.ca/papers/desnoyers-ols2006.pdf

(and for Ingo : I haven't rerun the tests on your modified kprobes, it will
come in time. But I do not really expect that 30-50 cycles compared to 1500
will make a very big difference.)

Mathieu

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