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

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Message-ID: <Pine.LNX.4.64.0609171918430.6761@scrub.home>
Date:	Sun, 17 Sep 2006 19:26:34 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Ingo Molnar <mingo@...e.hu>, 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

Hi,

On Mon, 18 Sep 2006, Nick Piggin wrote:

> > > > The foremost issue is still that there is only limited kprobes support.
> > > 
> > > > The main issue in supporting static tracers are the tracepoints and so
> > > > far I haven't seen any convincing proof that the maintainance overhead
> > > > of dynamic and static tracepoints has to be significantly different.
> 
> Above, weren't you asking about static vs dynamic trace-*points*, rather
> than the implementation of the tracer itself. I think Ingo said that
> some "static tracepoints" (eg. annotation) could be acceptable.

No, he made it rather clear, that as far as possible he only wants dynamic 
annotations (e.g. via function attributes).

> > What you basically tell me is (rephrased to make it more clear): Implement
> > kprobes support or fuck off! You make it very clear, that you're unwilling
> > to support static tracers even to point to make _any_ static trace support 
> 
> Now it seems you are talking about compiled vs runtime inserted traces,
> which is different. And so far I have to agree with Ingo: dynamic seems
> to be better in almost every way. Implementation may be more complex,
> but that's never stood in the way of a better solution before, and I
> don't think anybody has shown it to be prohibitive ("I won't implement
> it" notwithstanding)

I don't deny that dynamic tracer are more flexible, but I simply don't 
have the resources to implement one. If those who demand I use a dynamic 
tracer, would also provide the appropriate funding, it would change the 
situation completely, but without that I have to live with the tools 
available to me.

bye, Roman
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