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

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Message-ID: <20131028141152.GA1040@linux.vnet.ibm.com>
Date:	Mon, 28 Oct 2013 19:41:52 +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:

* Pekka Enberg <penberg@....fi> [2013-10-28 14:42:13]:

> >So, it still needs a concrete binary path to list or, we should
> >support a syntax which specify actual binary, as like as below.
> >
> >  perf probe 'my_event=%libc:setjmp@...b64/libc.so.6'
> >
> >And perf list may show the marker as in same syntax (for copy&paste).
> >
> ># perf list --sdt
> >  %libc:setjmp@...b64/libc.so.6
> >  ...
> >
> >Note that we need '%' to separate namespace :(, since user can define
> >any marker(provider) name in their binary...
> 
> Sure, you need to support that sort of 'fully qualified name' for
> duplicate symbols but the default 'libc:setjmp' should still point
> to system libc.

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?

-- 
Thanks and Regards
Srikar Dronamraju

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