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

From: Namhyung Kim
Date: Sun Jul 27 2014 - 21:32:25 EST

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
> 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

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.

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