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

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Message-ID: <Pine.LNX.4.64.0609141537120.6762@scrub.home>
Date:	Thu, 14 Sep 2006 15:40:41 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	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

Hi,

On Thu, 14 Sep 2006, Ingo Molnar wrote:

> 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?

Could you define "zero-overhead"?
Actual implementation aside having a core number of tracepoints is far 
more portable than KProbes.

bye, Roman
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