linux-kernel - Re: [PATCH 28/52] perf script: Allow callchains if any event samples them

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Date:	Mon, 28 Jul 2014 10:32:02 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 28/52] perf script: Allow callchains if any event samples them

Hi Arnaldo,

On Fri, 25 Jul 2014 10:27:05 -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jul 22, 2014 at 04:17:37PM +0300, Adrian Hunter escreveu:
>> perf script was not displaying callchains if any selected
>> event did not have PERF_SAMPLE_CALLCHAIN.  Change this to
>> disable callchains only if all selected events do not have
>> PERF_SAMPLE_CALLCHAIN.
>
> I wonder if some other tool gets this wrong as well, report maybe?
>
> Perhaps we need to have this check in some perf_evlist method?
>
> Wonder how report/top, i.e. the hists browser will react with some
> events having callchains while some don't, specially with this new
> children stuff, Namhyung, can you please check that?

The children/cumulate stuff is enabled if a combined sample type
contains PERF_SAMPLE_CALLCHAIN and works only a sample actually contains
callchain.

So I guess if some have it and some don't, events don't have callchain
just prints real entries/samples with same children overhead value.

Thanks,
Namhyung
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