linux-kernel - Re: [PATCH v2] perf: add callgrind conversion tool

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Message-ID: <CA+BNSkVVmnUJuas2DFOoF6OBfZpnK16S9u2pvawv+aELgNUBHw@mail.gmail.com>
Date:	Wed, 27 Mar 2013 10:07:52 -0700
From:	Roberto Vitillo <ravitillo@....gov>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, mingo@...hat.com, acme@...stprotocols.net
Subject: Re: [PATCH v2] perf: add callgrind conversion tool

On Wed, Mar 27, 2013 at 12:23 AM, Namhyung Kim <namhyung@...nel.org> wrote:
> Hi Roberto,
>
> On Tue, 26 Mar 2013 12:14:49 -0700, Roberto Vitillo wrote:
>> The proposed patch adds the convert tool to perf which allows to convert a
>> perf.data file to a set of callgrind data files which can subsequently be
>> displayed with kcachegrind.
>>
>> Note that the code may trigger the following bug in libbfd:
>> http://sourceware.org/bugzilla/show_bug.cgi?id=15106
>
> Does it now support call graph too?  Great if so!

Yes it does.

> Anyway, I suggest that splitting patch to two - one for addr2line and
> another for actual 'convert' tool.

Ok

> I think we *can* use the tool
> without libbfd (but with external addr2line binary or even with no line
> number information).

Well, I could use the external addr2line binary but the tool will
become terribly slow. A warning message could notify the
user to recompile perf with libbfd to speed up the conversion.
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