linux-kernel - Re: [PATCH -tip tracing/kprobes 0/9] tracing/kprobes, perf: perf probe and kprobe-tracer bugfixes

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Message-ID: <20091020175116.GD4906@nowhere>
Date:	Tue, 20 Oct 2009 19:51:19 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Re: [PATCH -tip tracing/kprobes 0/9] tracing/kprobes, perf: perf
	probe and kprobe-tracer bugfixes

On Tue, Oct 20, 2009 at 08:43:34AM +0200, Ingo Molnar wrote:
> also useful for command line workflows: 'perf probe --list' output - i 
> think we users to generate func_symbol+rel_position kind of probes.
> 
> Plus a relative position is more intuitive as well. If you see 
> 'schedule+10' versus 'schedule+102', you'll know it immediate that the 
> first one is early in the function while the second one is near the end.
> 
> If you see 'schedule@...5' versus 'schedule@...5' that kind of 'where in 
> the function is the probe, roughly' subjective impression is lost.
> 
> 	Ingo


Yeah, from a probe id reading POV, that's much better.

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