Date: Tue, 7 Jun 2011 21:36:12 +0530
From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Christoph Hellwig <hch@infradead.org>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
        Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Hugh Dickins <hughd@google.com>, Andi Kleen <andi@firstfloor.org>,
        Thomas Gleixner <tglx@linutronix.de>, Jonathan Corbet <corbet@lwn.net>,
        Oleg Nesterov <oleg@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jim Keniston <jkenisto@linux.vnet.ibm.com>,
        Roland McGrath <roland@hack.frob.com>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 20/22] 20: perf: perf interface for
 uprobes
Message-ID: <20110607160612.GB8876@linux.vnet.ibm.com>
Reply-To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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 <20110607133853.GC9949@in.ibm.com>
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* Arnaldo Carvalho de Melo <acme@infradead.org> [2011-06-07 11:21:16]:

> 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?
> 

What Ananth was saying was that perf probe for uprobes still has to take
advantage of tracing using line number; Also it is still restricted to
showing only register contents and we still have to add support for variables. I know that perf symbol library has support for that
just that we have to enable it for uprobes.

-- 
Thanks and Regards
Srikar
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