linux-kernel - Re: [PATCH 03/15] perf stat: Do not align time prefix in CSV output

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Date:   Wed, 23 Nov 2022 15:21:30 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        James Clark <james.clark@....com>,
        Athira Jajeev <atrajeev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 03/15] perf stat: Do not align time prefix in CSV output

On Wed, Nov 23, 2022 at 10:02 AM Namhyung Kim <namhyung@...nel.org> wrote:
>
> We don't care about the alignment in the CSV output as it's intended for machine
> processing.  Let's get rid of it to make the output more compact.
>
> Before:
>   # perf stat -a --summary -I 1 -x, true
>        0.001149309,219.20,msec,cpu-clock,219322251,100.00,219.200,CPUs utilized
>        0.001149309,144,,context-switches,219241902,100.00,656.935,/sec
>        0.001149309,38,,cpu-migrations,219173705,100.00,173.358,/sec
>        0.001149309,61,,page-faults,219093635,100.00,278.285,/sec
>        0.001149309,10679310,,cycles,218746228,100.00,0.049,GHz
>        0.001149309,6288296,,instructions,218589869,100.00,0.59,insn per cycle
>        0.001149309,1386904,,branches,218428851,100.00,6.327,M/sec
>        0.001149309,56863,,branch-misses,218219951,100.00,4.10,of all branches
>            summary,219.20,msec,cpu-clock,219322251,100.00,20.025,CPUs utilized
>            summary,144,,context-switches,219241902,100.00,656.935,/sec
>            summary,38,,cpu-migrations,219173705,100.00,173.358,/sec
>            summary,61,,page-faults,219093635,100.00,278.285,/sec
>            summary,10679310,,cycles,218746228,100.00,0.049,GHz
>            summary,6288296,,instructions,218589869,100.00,0.59,insn per cycle
>            summary,1386904,,branches,218428851,100.00,6.327,M/sec
>            summary,56863,,branch-misses,218219951,100.00,4.10,of all branches
>
> After:
>   0.001148449,224.75,msec,cpu-clock,224870589,100.00,224.747,CPUs utilized
>   0.001148449,176,,context-switches,224775564,100.00,783.103,/sec
>   0.001148449,38,,cpu-migrations,224707428,100.00,169.079,/sec
>   0.001148449,61,,page-faults,224629326,100.00,271.416,/sec
>   0.001148449,12172071,,cycles,224266368,100.00,0.054,GHz
>   0.001148449,6901907,,instructions,224108764,100.00,0.57,insn per cycle
>   0.001148449,1515655,,branches,223946693,100.00,6.744,M/sec
>   0.001148449,70027,,branch-misses,223735385,100.00,4.62,of all branches
>   summary,224.75,msec,cpu-clock,224870589,100.00,21.066,CPUs utilized
>   summary,176,,context-switches,224775564,100.00,783.103,/sec
>   summary,38,,cpu-migrations,224707428,100.00,169.079,/sec
>   summary,61,,page-faults,224629326,100.00,271.416,/sec
>   summary,12172071,,cycles,224266368,100.00,0.054,GHz
>   summary,6901907,,instructions,224108764,100.00,0.57,insn per cycle
>   summary,1515655,,branches,223946693,100.00,6.744,M/sec
>   summary,70027,,branch-misses,223735385,100.00,4.62,of all branches
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/util/stat-display.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index d86f2f8e020d..15c88b9b5aa3 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -828,7 +828,7 @@ static void print_counter_aggrdata(struct perf_stat_config *config,
>                         fprintf(output, "%s", prefix);
>                 else if (config->summary && config->csv_output &&
>                          !config->no_csv_summary && !config->interval)
> -                       fprintf(output, "%16s%s", "summary", config->csv_sep);
> +                       fprintf(output, "%s%s", "summary", config->csv_sep);
>         }
>
>         uval = val * counter->scale;
> @@ -1078,9 +1078,12 @@ static void prepare_interval(struct perf_stat_config *config,
>         if (config->iostat_run)
>                 return;
>
> -       if (!config->json_output)
> -               sprintf(prefix, "%6lu.%09lu%s", (unsigned long) ts->tv_sec,
> +       if (config->csv_output)
> +               sprintf(prefix, "%lu.%09lu%s", (unsigned long) ts->tv_sec,
>                                  ts->tv_nsec, config->csv_sep);
> +       else if (!config->json_output)
> +               sprintf(prefix, "%6lu.%09lu ", (unsigned long) ts->tv_sec,
> +                                ts->tv_nsec);
>         else if (!config->metric_only)
>                 sprintf(prefix, "{\"interval\" : %lu.%09lu, ", (unsigned long)
>                                  ts->tv_sec, ts->tv_nsec);
> --
> 2.38.1.584.g0f3c55d4c2-goog
>