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

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Date:	Tue, 06 Jul 2010 09:27:04 +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

Srikar Dronamraju wrote:
>> 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
> 
> It should have been perf probe -p 2403 hode.c:100 
> 
> However I have taken your comment and fixed that part of the code.
> So if it uprobe based probes and need_dwarf is set, it errors out.

Ah, that's great:)

Thank you,

> 
>> because pp->function == NULL.
>>
>> Thank you,

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