linux-kernel - Re: [PATCH 7/7] perf report: Enable group view with hierarchy

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Date:   Tue, 13 Sep 2016 10:06:19 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 7/7] perf report: Enable group view with hierarchy

On Mon, Sep 12, 2016 at 11:28:44AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Sep 12, 2016 at 03:19:58PM +0900, Namhyung Kim escreveu:
> > Now all missing pieces are implemented, let's enable it.  An example
> > output below:
> 
> So. what are those events? What was the command line that produced the
> 'perf.data' file that was used?

Oh, the command line was:

  $ perf record -e '{cycles,instructions}' make 

I'll add it to the changelog.

Thanks,
Namhyung


p.s. Actually the most overhead goes to the compiler (cc1) in this
data.  But I omitted it since it has so many unresolved symbol
addresses.  I think it's not a problem to demonstrate the hierarchy +
group feature.


> 
> - Arnaldo
>  
> >   $ perf report --hierarchy --stdio
> >   ...
> >   #               Overhead  Command / Shared Object / Symbol
> >   # ......................  ..................................
> >   #
> >       25.74%  27.18%        sh
> >          19.96%  24.14%        libc-2.24.so
> >             9.55%  14.64%        [.] __strcmp_sse2
> >             1.54%   0.00%        [.] __tfind
> >             1.07%   1.13%        [.] _int_malloc
> >             0.95%   0.00%        [.] __strchr_sse2
> >             0.89%   1.39%        [.] __tsearch
> >             0.76%   0.00%        [.] strlen
> >   ...
> > 
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/builtin-report.c | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> > index 1a07c4cdf6ed..6e88460cd13d 100644
> > --- a/tools/perf/builtin-report.c
> > +++ b/tools/perf/builtin-report.c
> > @@ -935,7 +935,6 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
> >  
> >  	if (symbol_conf.report_hierarchy) {
> >  		/* disable incompatible options */
> > -		symbol_conf.event_group = false;
> >  		symbol_conf.cumulate_callchain = false;
> >  
> >  		if (field_order) {
> > -- 
> > 2.9.3