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

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Message-ID: <20131028173152.GB1040@linux.vnet.ibm.com>
Date:	Mon, 28 Oct 2013 23:01:52 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Pekka Enberg <penberg@....fi>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.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,
	Namhyung Kim <namhyung@...nel.org>, aravinda@...ux.vnet.ibm.com
Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

> >
> >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. 

-- 
Thanks and Regards
Srikar Dronamraju

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