linux-kernel - Re: [PATCHv8 2.6.35-rc4-tip 12/12] perf: Show Potential probe points.

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Message-ID: <20100709055644.GD26884@linux.vnet.ibm.com>
Date:	Fri, 9 Jul 2010 11:26:44 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Mark Wielaard <mjw@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Naren A Devaiah <naren.devaiah@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCHv8 2.6.35-rc4-tip 12/12]  perf: Show Potential probe
 points.


> > Show all potential probes in a process by pid 21106 across all dsos
> > # perf probe -S -p 21106 | tail
> 
> Again, a file based interface would be much more useful.  E.g. what
> possible probe points do I have in my qemu binary.

Right, Currently perf probe needs -p option because it depend on
thread->map_groups for listing the dsos and its functions.

I am not sure if perf already has ability to list functions in a file
esp if we dont have dwarf information in that file. If perf has the
ability I will reuse it here or will try implementing one.

Arnaldo, Do you know offhand if perf already has the ability to list
functions in a file (with / without dwarf info).

> 
> Btw, this doesn't mean I want to see the PID based variant removed, it
> can be very useful for debugging long running processes.  I just don't
> think it's the most important / conveniant one.

Agree. 

--
Thanks and Regards
Srikar
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