linux-kernel - Re: [PATCH -tip 0/8] perf-probe updates

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Date:	Wed, 09 Dec 2009 16:41:39 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Re: [PATCH -tip 0/8] perf-probe updates

Masami Hiramatsu wrote:
>> Here the failure was because the symbol does not exist.
> 
> Yeah, so that's what I'm expecting to be implemented with below item :-)
> 
>    - Symbol search by libelf/kallsyms
> 
> I guess it will be done by using symbol.c.
> (Actually, current

Oops, I might miss something, forgot it.
actually, current perf probe doesn't decode kallsyms/elf, it just depends on
kprobe-tracer. And kprobe-tracer will return -EINVAL not only if the symbol
was not found, but also other reasons.

So, if we want to show below message, we need to decode elf or kallsyms.

> >
> > There's similar problems in most other failure cases. Trying to remove a
> > non-existent probe gives:
> >
> >   # perf probe -d test
> >   Warning: event "probe:test" is not found.
> >

Thank you,

-- 
Masami Hiramatsu

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

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

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