Date: Fri, 9 Jul 2010 11:13:35 -0300
From: Arnaldo Carvalho de Melo <acme@infradead.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>,
       Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
       Steven Rostedt <rostedt@goodmis.org>,
       Randy Dunlap <rdunlap@xenotime.net>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
       Oleg Nesterov <oleg@redhat.com>, Mark Wielaard <mjw@redhat.com>,
       Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Naren A Devaiah <naren.devaiah@in.ibm.com>,
       Jim Keniston <jkenisto@linux.vnet.ibm.com>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       "Frank Ch. Eigler" <fche@redhat.com>,
       Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCHv8 2.6.35-rc4-tip 12/12] perf: Show Potential probe points.
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Em Fri, Jul 09, 2010 at 11:26:44AM +0530, Srikar Dronamraju escreveu:
> > > 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).

Definetely, it actually doesn't use DWARF at all, its just the
symtabs that are used. It prefers -debuginfo packages because those have
richer symtabs, but if just the stripped file is used it will try to use
.dynsym, etc.

Look at tools/perf/builtin-test.c, it has a regression test for the
symbol lib, should be enough.

- Arnaldo
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