linux-kernel - Re: [PATCH] perf stat: Fix no metric header if --per-socket and --metric-only set

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Date:   Fri, 3 Apr 2020 11:45:00 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH] perf stat: Fix no metric header if --per-socket and
 --metric-only set

On Wed, Apr 01, 2020 at 02:02:26AM +0800, Jin Yao wrote:
> We received a report that was no metric header displayed if --per-socket
> and --metric-only were both set.
> 
> It's hard for script to parse the perf-stat output. This patch fixes this
> issue.
> 
> Before:
> 
>   root@...-ppc:~# perf stat -a -M CPI --metric-only --per-socket
>   ^C
>    Performance counter stats for 'system wide':
> 
>   S0        8                  2.6
> 
>          2.215270071 seconds time elapsed
> 
>   root@...-ppc:~# perf stat -a -M CPI --metric-only --per-socket -I1000
>   #           time socket cpus
>        1.000411692 S0        8                  2.2
>        2.001547952 S0        8                  3.4
>        3.002446511 S0        8                  3.4
>        4.003346157 S0        8                  4.0
>        5.004245736 S0        8                  0.3
> 
> After:
> 
>   root@...-ppc:~# perf stat -a -M CPI --metric-only --per-socket
>   ^C
>    Performance counter stats for 'system wide':
> 
>                                CPI
>   S0        8                  2.1
> 
>          1.813579830 seconds time elapsed
> 
>   root@...-ppc:~# perf stat -a -M CPI --metric-only --per-socket -I1000
>   #           time socket cpus                  CPI
>        1.000415122 S0        8                  3.2
>        2.001630051 S0        8                  2.9
>        3.002612278 S0        8                  4.3
>        4.003523594 S0        8                  3.0
>        5.004504256 S0        8                  3.7
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
>  tools/perf/util/stat-shadow.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
> index 0fd713d3674f..03ecb8cd0eec 100644
> --- a/tools/perf/util/stat-shadow.c
> +++ b/tools/perf/util/stat-shadow.c
> @@ -803,8 +803,11 @@ static void generic_metric(struct perf_stat_config *config,
>  				     out->force_header ?
>  				     (metric_name ? metric_name : name) : "", 0);
>  		}
> -	} else
> -		print_metric(config, ctxp, NULL, NULL, "", 0);
> +	} else {
> +		print_metric(config, ctxp, NULL, NULL,
> +			     out->force_header ?
> +			     (metric_name ? metric_name : name) : "", 0);
> +	}
>  
>  	for (i = 1; i < pctx.num_ids; i++)
>  		zfree(&pctx.ids[i].name);
> -- 
> 2.17.1
>