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

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Message-ID: <20060916082107.GB6317@elte.hu>
Date:	Sat, 16 Sep 2006 10:21:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, karim@...rsys.com,
	Andrew Morton <akpm@...l.org>,
	Paul Mundt <lethal@...ux-sh.org>, Jes Sorensen <jes@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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


* Roman Zippel <zippel@...ux-m68k.org> wrote:

> [...] It would also add virtually no maintainance overhead as you like 
> to claim - how often does this function change?

as i said, roughly half of the tracepoints are like this - and some of 
them in functions in frequented places. That's far from "virtually no 
maintainance overhead". In the -rt tree i have never more than a dozen 
static tracepoints, yet even this small amount caused at least 5 extra 
-rt tree iterations due to various breakages (build problems or even 
crashes). Cruft comes in small steps, and my worry is that such 
_unremovable_ markups will be cruft that never shrinks. With dynamic 
tracers i see the _chance_ for cruft to shift to places where it does 
not hurt, if that cruft turns out to become a hindrance.

	Ingo
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