linux-kernel - Re: [PATCH 1/3] perf tools: Record total sampling time

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Date:	Mon, 2 Dec 2013 17:24:59 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Pekka Enberg <penberg@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Pekka Enberg <penberg@....fi>
Subject: Re: [PATCH 1/3] perf tools: Record total sampling time

Em Mon, Dec 02, 2013 at 05:36:20PM +0100, Ingo Molnar escreveu:
> * Namhyung Kim <namhyung@...nel.org> wrote:
> > 2013-12-02 (월), 13:57 +0100, Ingo Molnar:
> > > So basically, in the end I think it should be possible to have the 
> > > following behavior:

> > >    perf record -a -e cycles sleep 1

> > >    perf report stat              # Reports as if we ran: 'perf stat -a -e cycles sleep 1'
> > >    perf report                   # Reports the usual histogram

> > >    perf report --stat            # Reports the perf stat output and the histogram

> > > or so.

> > I don't think we need both of 'perf report stat' and 'perf report
> > --stat'.  At least it looks somewhat confusing to users IMHO.
 
> Okay. Maybe the --stat option would be the more logical choice, 
> because '--' options can be added arbitrarily, while it would be weird 
> to add multiple subcommand options.
 
> So basically there would be two options:
 
>    --show-stat         [--no-show-stat]
>    --show-histogram    [--no-show-histogram]
 
> Today --show-histogram is the only one enabled by default.
 
> Running:
 
>    perf report --no-show-histogram --show-stat

Why not:

perf stat -i perf.data

and make it be an optional argument, so plain:

perf stat -i

would process perf.data, i.e. would get the samples, accrue the periods,
calculate the time, etc and then present it as 'perf stat <some
target>'.

Right now 'perf stat -i' i used for '--no-inherit', perhaps we can just
have --no-inherit have no short option and grab -i to have the same
meaning as in 'report', 'script', etc.

- Arnaldo
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