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

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Message-ID: <450AB5F9.8040501@opersys.com>
Date:	Fri, 15 Sep 2006 10:17:29 -0400
From:	Karim Yaghmour <karim@...rsys.com>
To:	Paul Mundt <lethal@...ux-sh.org>
CC:	Roman Zippel <zippel@...ux-m68k.org>, Jes Sorensen <jes@....com>,
	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.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


Paul Mundt wrote:
> subjective, LTT proved that this was a problem regarding general
> code-level intrusiveness when the number of tracepoints in relatively
> close locality started piling up based on what people considered
> arbitrarily useful, and LTTng doesn't appear to do anything to address
> this.

"LTT proved that ..." what are you talking about? Have you noticed
the posting earlier regarding the fact that the ltt tracepoints did
not change over a 5 year span? **five** years ... Where do you get
this claim that ltt trace points "started piling up"? Have a look
at figure 2 of this article and let me know exactly which of those
tracepoints are actually a problem to you:
http://www.usenix.org/events/usenix2000/general/full_papers/yaghmour/yaghmour_html/index.html

Karim
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