linux-kernel - Re: [PATCH v4 3.0-rc2-tip 20/22] 20: perf: perf interface for uprobes

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Message-ID: <20110607142116.GA8311@ghostprotocols.net>
Date:	Tue, 7 Jun 2011 11:21:16 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 20/22] 20: perf: perf interface for uprobes

Em Tue, Jun 07, 2011 at 07:08:53PM +0530, Ananth N Mavinakayanahalli escreveu:
> On Tue, Jun 07, 2011 at 09:30:39AM -0400, Christoph Hellwig wrote:
> > On Tue, Jun 07, 2011 at 06:32:16PM +0530, Srikar Dronamraju wrote:
> > > Enhances perf probe to user space executables and libraries.
> > > Provides very basic support for uprobes.

> > Nice.  Does this require full debug info for symbolic probes,
> > or can it also work with simple symbolc information?
 
> It works only with symbol information for now.
> It doesn't (yet) know how to use debuginfo :-)

'perf probe' uses perf symbol library, so it really don't have to know
from where symbol resolution information is obtained, only if it needs
things that are _just_ on debuginfo, such as line information, etc.

But then that is also already supported in 'perf probe'.

Or is there something else in particular you're thinking?

- Arnaldo
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