linux-kernel - Re: [PATCH 6/7] perf tools: Append callchains only when requested

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Date:	Sun, 4 Jan 2015 00:01:26 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 6/7] perf tools: Append callchains only when requested

Hi Arnaldo,

On Sat, Jan 3, 2015 at 11:25 AM, Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
> Em Mon, Dec 22, 2014 at 01:44:14PM +0900, Namhyung Kim escreveu:
>> The perf report --children can be called with callchain disabled so no
>> need to append callchains.  Actually the root of callchain tree is not
>> initialized properly in this case.
>
> Hi Namhyung,
>
>         I should have caught this using 'perf test', but it slipped
> thru, please try running 'perf test cumulation', I noticed that it fails
> and that if I revert this changeset it works again, can you please
> check?

This change should not affect the test result, but I guess the test
somehow relied on the undefined behavior.  Actually I posted a patch
to fix this problem.  So please take a look at the link below:

https://lkml.org/lkml/2014/12/22/561

Thanks,
Namhyung
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