linux-kernel - Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

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Message-ID: <20110406125226.GB1867@nowhere>
Date:	Wed, 6 Apr 2011 14:52:28 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
Cc:	David Ahern <dsahern@...il.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	2nddept-manager@....hitachi.co.jp,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

On Mon, Apr 04, 2011 at 07:00:40PM +0900, Akihiro Nagai wrote:
> (2011/04/02 0:13), Frederic Weisbecker wrote:
> >On Mon, Mar 28, 2011 at 08:31:23AM -0600, David Ahern wrote:
> >>On 03/28/11 04:34, Akihiro Nagai wrote:
> >>>>from is sample->ip? to is sample->addr? In the above example
> >>>>0x39d3015260 is the value from sample->addr, 1526f is sample->ip which
> >>>>resolves to _dl_next_ld_env_entry from /lib64/ld-2.13.so.
> >>>Yes.
> >>>In this example, resolved address is only sample->ip (branch from).
> >>>We need the resolved address of sample->addr (branch to) too, because
> >>>both of them are addresses of execution code.
> >>
> >>Ok, now I understand. In that case add conversion of sample->addr to
> >>symbols to perf-script.
> >
> >I agree that we should rather use perf script for branch dumps.
> >Sorry Akihiro, I think we suggested you to create this dedicated
> >perf branch by the past. But then perf script became the vanilla dump
> >tool in the middle and it seems more suitable today.
> >
> >We can still create a perf branch later in order to produce some more
> >advanced post-processing tools. But for sample dumps perf script (which starts
> >to show itself as a misnomer BTW) seems to be the right place.
> Finally, I would like to create coverage test tools using BTS on perf.
> I'm working on the project "Btrax" that is a coverage test tool using BTS.
> The URL is: http://sourceforge.net/projects/btrax/

Cool, what is this tool doing? How is it different from perf branch?

> 
> And, I would like to implement other functions on perf-branch too.
> For example, call graph, source code browser like perf-annotate which
> can show executed codes.
> So, I wolud like to continue to develop perf-branch.

And you're very welcome to do so. Such features have a nice potential
I think.

Thanks.
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