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

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Message-ID: <526F22C2.2070403@hitachi.com>
Date:	Tue, 29 Oct 2013 11:51:46 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Pekka Enberg <penberg@....fi>,
	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,
	Namhyung Kim <namhyung@...nel.org>, aravinda@...ux.vnet.ibm.com
Subject: Re: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

(2013/10/29 2:31), Srikar Dronamraju wrote:
>>>
>>> But what if a system has both 32 bit libc and 64 bit libc?
>>> Wont we could end up with 2 libc:setjmp?
>>> Should we give some more intelligence into perf to choose the 64 bit
>>> libc over 32 bit one?
>>
>> You can just trace both of them by default, no?
>>
> 
> There has to be a one to one association with the event name and its
> mapping.  Every event name will finally map to a unique inode and an
> offset.
> 
> One option would be for perf to look at these markers and have a
> different event name for similar markers in different executables. 

Or, another idea is introducing hidden event group which
automatically merges those similar markers and shows
as one event alias name. :)

Thank you,

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


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