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

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Date:	Tue, 20 Oct 2009 10:27:07 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frederic Weisbecker <fweisbec@...il.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

Ingo Molnar wrote:
> 
> * Masami Hiramatsu <mhiramat@...hat.com> wrote:
> 
>> How about the following syntax?
>> <adding>
>> perf probe schedule
>> perf probe --add schedule
>>
>> <deleting>
>> perf probe --del schedule
>> perf probe --del all	/* delete all probepoints */
>>
>> So, this doesn't symmetric, but provides simple way to add a probe.
> 
> agreed. For deletion, eventually this:
> 
>   perf probe --del "*"
> 
> should also work - as should other regexp (or glob) matches on a range 
> of existing probes.

Ah, that's a nice idea :-), it allows user to delete a group of
probes, like --del "schedule*".

> plus there should be a perf probe call to output all current probes as 
> perf probe commands - so that it can be saved (and restored).

Sure. 'perf probe --save file' & 'perf probe --restore file' will be
fine for me.

Thank you,
-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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