linux-kernel - Re: [PATCHv7 2.6.35-rc3-tip 11/11] perf: perf interface for uprobes

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Message-ID: <4C2DCC9D.1020001@hitachi.com>
Date:	Fri, 02 Jul 2010 20:25:17 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv7 2.6.35-rc3-tip 11/11]  perf: perf interface for uprobes

Masami Hiramatsu wrote:
> Srikar Dronamraju wrote:
>> perf: perf interface for uprobes
>>
>> Changelog from v4: Merged to 2.6.35-rc3-tip.
>>
>> Changelog from v3: (addressed comments from Masami Hiramatsu)
>> 	* Every process id has a different group name.
>> 	* event name starts with function name.
>> 	* If vaddr is specified, event name has vaddr appended
>> 	  along with function name, (this is to avoid subsequent probes
>> 	  using same event name.)
>> 	* warning if -p and --list options are used together.
>>
>> 	Also dso can either be a short name or absolute path.
>>
>> Enhances perf probe to accept pid and user vaddr.
>> Provides very basic support for uprobes.
> 
> It's unsure what will happen if user sets a probe by line number...
> I'd like to suggest you if need_dwarf && uid, it should show an error message.
> But other parts are OK for me.

I've checked that perf probe was stopped by SEGV in convert_name_to_addr() with
below options.

# perf probe -u 2403 hoge.c:100

because pp->function == NULL.

Thank you,
-- 
Masami HIRAMATSU
2nd Research Dept.
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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