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

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Message-ID: <20110401152431.GA26938@ghostprotocols.net>
Date:	Fri, 1 Apr 2011 12:24:31 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Akihiro Nagai <akihiro.nagai.hw@...achi.com>,
	Ingo Molnar <mingo@...e.hu>, 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

Em Fri, Apr 01, 2011 at 05:15:17PM +0200, Peter Zijlstra escreveu:
> On Fri, 2011-04-01 at 17:13 +0200, 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.
> 
> Why do something with snakes if its perfectly possible to do in C ?

He is not meaning using python, hence the "misnomer" comment.

- Arnaldo
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