Re: [RFC/PATCH 0/4] perf report: Support folded callchain output (v2)

From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Jiri Olsa <jolsa@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
	David Ahern <dsahern@gmail.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Andi Kleen <andi@firstfloor.org>, Kan Liang <kan.liang@intel.com>
Subject: Re: [RFC/PATCH 0/4] perf report: Support folded callchain output (v2)
Date: Tue, 3 Nov 2015 10:35:35 +0900	[thread overview]
Message-ID: <20151103013535.GD11498@danjae.kornet> (raw)
In-Reply-To: <20151103004647.GE21609@kernel.org>

On Mon, Nov 02, 2015 at 09:46:47PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 03, 2015 at 08:46:06AM +0900, Namhyung Kim escreveu:
> > On Mon, Nov 02, 2015 at 08:04:36PM -0300, Arnaldo Carvalho de Melo wrote:
> > > I still think that this is a 'perf report' thing, but one that is
> > > centered in callchains, and that is to be consumed by scripts, not
> > > humans.
>  
> > Agreed.
>  
> > I'm just looking for a way to support it with minimal change. :)
> 
> Hey, me too. A --no-hists flag looks like a quickie, no need to isolate
> callchain code, or anything like that, just one long option switch and
> we get what we need.

Hmm.. okay.  Let me think about the --no-hists flags then.

What do you want to do if the --no-hists flags is used without folded
callchain mode or other than --stdio?

And if you want to print other info in the callchains, what would be
the output of non-folded mode?

I think the simplest solution would be supporting the folded mode only
and error out other cases.  Is it ok to you?

Thanks,
Namhyung