linux-kernel - Re: [PATCH -tip v4 0/7] perf: Introduce branch sub commands

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Message-ID: <20110530161147.GA1741@somewhere>
Date:	Mon, 30 May 2011 18:11:49 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Akihiro Nagai <akihiro.nagai.hw@...achi.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>,
	pp-manager@....hitachi.co.jp
Subject: Re: [PATCH -tip v4 0/7] perf: Introduce branch sub commands

On Mon, May 30, 2011 at 09:26:28AM -0600, David Ahern wrote:
> On 05/30/2011 07:31 AM, Akihiro Nagai wrote:
> >> The sample address can be converted to symbols and the output can be
> >> added to perf-script rather easily. Attached is an example. I was going
> >> to submit it back in April and got distracted. I'll rebase, move the
> >> addr->sym conversion to a function and submit later today.
> > OK.
> > I agreed with implementing it on perf script.
> > I'd like to try it.
> 
> Updated patch. It applies on top of:
>   http://lkml.org/lkml/2011/5/27/385
> 
> Hopefully for BTS you only have to change the sample_addr_correlates_sym
> function.
> 
> I still need to look into out why some of the addresses for page-faults
> are not resolving to symbols.

Perhaps it only resolves instruction faults because you only resolve with
MAP__FUNCTION. You can try MAP__VARIABLE as well when that fails.

But that is going to only help with faults on global vars, ie: only
a few part of them. Further information would require some dwarf processing.

Your patch looks good though. Mind resending it with appropriate title/changelog
and signed-off-by tag?

thanks.
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