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

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Date:	Fri, 13 May 2016 08:48:48 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...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

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!

- Arnaldo
 
>  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