linux-kernel - Re: [PATCH 1/3] perf diff: Fix indentation of stalled backend cycle

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Date:	Fri, 13 May 2016 22:42:24 +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 1/3] perf diff: Fix indentation of stalled backend cycle

Hi Arnaldo,

On Fri, May 13, 2016 at 08:48:48AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Fri, May 13, 2016 at 03:01:01PM +0900, Namhyung Kim escreveu:
> > The commit 140aeadc1fb5 ("perf stat: Abstract stat metrics printing")
> > changed way to print shadow metrics, but it missed to update the width
> > of stalled backend cycles event to 7.2% like others.  This resulted in
> > misaligned output like below:
> 
> Thanks for pointing out the cset that introduced the problem, helps in
> reviewing! Next time please consider adding it right before your
> Signed-off-by line as:
> 
> Fixes: 140aeadc1fb5 ("perf stat: Abstract stat metrics printing")
> 
> Thanks!

Ok, will do it later.  Btw I found the subject line should start with
'perf stat' instead of 'perf diff'..

Thanks,
Namhyung


>  
> >  Performance counter stats for 'pwd':
> > 
> >           0.638313      task-clock (msec)         #    0.567 CPUs utilized
> >                  0      context-switches          #    0.000 K/sec
> >                  0      cpu-migrations            #    0.000 K/sec
> >                 54      page-faults               #    0.085 M/sec
> >            885,600      cycles                    #    1.387 GHz
> >            558,438      stalled-cycles-frontend   #   63.06% frontend cycles idle
> >            431,355      stalled-cycles-backend    #  48.71% backend cycles idle
> >            674,956      instructions              #    0.76  insn per cycle
> >                                                   #    0.83  stalled cycles per insn
> >            130,380      branches                  #  204.257 M/sec
> >      <not counted>      branch-misses
> > 
> >        0.001125426 seconds time elapsed
> > 
> > Cc: Andi Kleen <andi@...stfloor.org>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/util/stat-shadow.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
> > index fdb71961143e..61200fcac5ef 100644
> > --- a/tools/perf/util/stat-shadow.c
> > +++ b/tools/perf/util/stat-shadow.c
> > @@ -188,7 +188,7 @@ static void print_stalled_cycles_backend(int cpu,
> >  
> >  	color = get_ratio_color(GRC_STALLED_CYCLES_BE, ratio);
> >  
> > -	out->print_metric(out->ctx, color, "%6.2f%%", "backend cycles idle", ratio);
> > +	out->print_metric(out->ctx, color, "%7.2f%%", "backend cycles idle", ratio);
> >  }
> >  
> >  static void print_branch_misses(int cpu,
> > -- 
> > 2.8.2