linux-kernel - Re: [PATCH 23/23] perf top: Add --hierarchy option

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Message-ID: <20160210144649.GG4301@danjae.kornet>
Date:	Wed, 10 Feb 2016 23:46:49 +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 23/23] perf top: Add --hierarchy option

On Wed, Feb 10, 2016 at 02:19:40PM +0100, Jiri Olsa wrote:
> On Tue, Feb 09, 2016 at 11:37:10PM +0100, Jiri Olsa wrote:
> > On Fri, Feb 05, 2016 at 10:01:55PM +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"),
> > >  	OPT_END()
> > >  	};
> > >  	const char * const top_usage[] = {
> > > @@ -1241,6 +1243,19 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
> > >  		goto out_delete_evlist;
> > >  	}
> > >  
> > > +	if (symbol_conf.report_hierarchy) {
> > > +		/* disable incompatible options */
> > > +		symbol_conf.event_group = false;
> > > +		symbol_conf.cumulate_callchain = false;
> > > +
> > > +		if (field_order) {
> > > +			pr_err("Error: --hierarchy and --fields options cannot be used together\n");
> > > +			parse_options_usage(top_usage, options, "fields", 0);
> > > +			parse_options_usage(NULL, options, "hierarchy", 0);
> > > +			goto out_delete_evlist;
> > > +		}
> > > +	}
> > 
> > I was wondering about this when I was going through the patchset ;-)
> 
> but isn't that too restricting? hows about fields like
> overhead_sys/us, samples, period 

Allowing -F/--fields option cannot ensure the hierarchy mode working
correctly.  Those fields can be shown with following options anyway..

  -n, --show-nr-samples
                        Show a column with the number of samples
      --show-cpu-utilization
                        Show sample percentage for different cpu modes
      --show-total-period
                        Show a column with the sum of periods

Thanks,
Namhyung