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

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Message-ID: <1301670917.4859.696.camel@twins>
Date:	Fri, 01 Apr 2011 17:15:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	David Ahern <dsahern@...il.com>,
	Akihiro Nagai <akihiro.nagai.hw@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	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

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 ?
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