linux-kernel - Re: [PATCH v6 25/25] perf top: Add --hierarchy option

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Message-ID: <20160221091931.GD32589@danjae.kornet>
Date:	Sun, 21 Feb 2016 18:19:31 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH v6 25/25] perf top: Add --hierarchy option

On Sun, Feb 21, 2016 at 12:19:29AM +0100, Jiri Olsa wrote:
> On Tue, Feb 16, 2016 at 11:08:43PM +0900, Namhyung Kim wrote:
> > Support hierarchy output for perf-top using --hierarchy option.
> > 
> > Acked-by: Pekka Enberg <penberg@...nel.org>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/Documentation/perf-top.txt |  3 +++
> >  tools/perf/builtin-top.c              | 15 +++++++++++++++
> >  2 files changed, 18 insertions(+)
> > 
> > diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
> > index b0e60e17db38..19f046f027cd 100644
> > --- a/tools/perf/Documentation/perf-top.txt
> > +++ b/tools/perf/Documentation/perf-top.txt
> > @@ -233,6 +233,9 @@ Default is to monitor all CPUS.
> >  --raw-trace::
> >  	When displaying traceevent output, do not use print fmt or plugins.
> >  
> > +--hierarchy::
> > +	Enable hierarchy output.
> > +
> >  INTERACTIVE PROMPTING KEYS
> >  --------------------------
> >  
> > diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> > index a75de3940b97..b86b623e8799 100644
> > --- a/tools/perf/builtin-top.c
> > +++ b/tools/perf/builtin-top.c
> > @@ -1214,6 +1214,8 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
> >  		     parse_branch_stack),
> >  	OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
> >  		    "Show raw trace event output (do not use print fmt or plugins)"),
> > +	OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
> > +		    "Show entries in a hierarchy"),
> 
> hum, I'm not getting --children (default) output with hierarchy?
> 
> I can't see this was intentional.. haven't found the reason yet

Currently the hierarchy mode disables the children mode.  This is for
simplicity and I didn't test the combination thoroughly although it
would work.  Maybe we can remove the restriction later, but I think
it'd be better to start with a simple choice.

Thanks,
Namhyung