linux-kernel - Re: RFC: callchain showing same entry as hist

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Message-ID: <20160816154657.GL20972@kernel.org>
Date:	Tue, 16 Aug 2016 12:46:57 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: RFC: callchain showing same entry as hist_entry

Em Wed, Aug 17, 2016 at 12:41:18AM +0900, Namhyung Kim escreveu:
> On Tue, Aug 16, 2016 at 12:32:44PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Aug 16, 2016 at 12:31:43PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Wed, Aug 17, 2016 at 12:23:55AM +0900, Namhyung Kim escreveu:
> > > > Did you run 'perf report -s sym --stdio'?  It seems that current code
> > > > already works as sane..  Do you want to make it work for the default sort
> > > >> key too?
> > > 
> > > What I want is not to repeat the hist_entry line as the first entry in
> > > the callchain, which is confusing.
> > > 
> > > I.e. repeat the duplication that is happening with the default sort
> > 
> > s/repeat/remove/g
> > 
> > > entry, that contains "sym".
> 
> Hmm.. if so, wouldn't it be better skipping the first callchain entry
> when the user-given sort key contains "sym" too (not only when it
> starts with 'sym')?

Probably, I think, whatever causes the mentioned duplication. And do
that at all the UIs, hence the suggestion for a callchain__first_node()
or more suitably named routine where such logic would live, to be
used for all the callchain rendering interfaces.

- Arnaldo