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

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Message-ID: <450AAE39.4040205@sgi.com>
Date:	Fri, 15 Sep 2006 15:44:25 +0200
From:	Jes Sorensen <jes@....com>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	Karim Yaghmour <karim@...rsys.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

Roman Zippel wrote:
> The claim that these tracepoints would be maintainance burden is pretty 
> much unproven so far. The static tracepoint haters just assume the kernel 
> will be littered with thousands of unrelated tracepoints, where a good 
> tracepoint would only document what already happens in that function, so 
> that the tracepoint would be far from something obscure, which only few 
> people could understand and maintain.

How do you propose to handle the case where two tracepoint clients wants
slightly different data from the same function? I saw this with LTT
users where someone wanted things in different places in schedule().

It *is* a nightmare to maintain.

You still haven't explained your argument about kprobes not being
generally available - where?

Cheers,
Jes



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