linux-kernel - Re: [PATCH v4 3.0-rc2-tip 20/22] 20: perf: perf interface for uprobes

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Message-ID: <4DEEEF4C.2000404@hitachi.com>
Date:	Wed, 08 Jun 2011 12:41:00 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	ananth@...ibm.com
Cc:	Christoph Hellwig <hch@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 20/22] 20: perf: perf interface for	uprobes

(2011/06/07 22:38), Ananth N Mavinakayanahalli wrote:
> On Tue, Jun 07, 2011 at 09:30:39AM -0400, Christoph Hellwig wrote:
>> On Tue, Jun 07, 2011 at 06:32:16PM +0530, Srikar Dronamraju wrote:
>>>
>>> Enhances perf probe to user space executables and libraries.
>>> Provides very basic support for uprobes.
>>
>> Nice.  Does this require full debug info for symbolic probes,
>> or can it also work with simple symbolc information?
> 
> It works only with symbol information for now.
> It doesn't (yet) know how to use debuginfo :-)

So we can enhance it to use debuginfo for obtaining
variables or line numbers from debuginfo. since
probe-finder already has the analysis part, I think
it's not hard to support userspace apps.

Thanks!

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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