linux-kernel - Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

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Date:	Tue, 29 Oct 2013 14:31:11 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Pekka Enberg <penberg@....fi>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	hegdevasant@...ux.vnet.ibm.com, Ingo Molnar <mingo@...hat.com>,
	anton@...hat.com, systemtap@...rceware.org,
	aravinda@...ux.vnet.ibm.com
Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

Hi Masami,

On Tue, 29 Oct 2013 12:19:37 +0900, Masami Hiramatsu wrote:
> (2013/10/29 2:48), Pekka Enberg wrote:
>> For the 32-bit and 64-bit libc case, why cannot 'perf list'
>> by default print out something like:
>> 
>> $ perf list
>> 
>>    libc:setjmp [SDT marker group]
>> 
>> and provide a '--fully-qualified' command line option that:
>> 
>> $ perf list --fully-qualified
>> 
>> libc:setjmp => libc32:setjmp, libc64:setjmp      [SDT marker group]
>> libc32:setjmp => libc:setjmp@...b/libc.so.6      [SDT marker]
>> libc64:setjmp => libc:setjmp@...b64/libc.so.6  [SDT marker]
>> 
>> and then teach 'perf trace' to deal with SDT marker groups
>> where you trace two events, not one?
>
> Ah, that's a good idea. :)
> And it also is needed for another probe event because
> sometimes inlined functions have multiple instances.
> I'd like to fold them as one event group.

Yes, I'd love to see it as well. :)

Thanks,
Namhyung
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