Re: [PATCH 2/5] perf bench uprobe: Print diff to baseline

[Masami Hiramatsu (Google) <mhiramat@kernel.org>]

On Wed, 19 Jul 2023 17:49:07 -0300
Arnaldo Carvalho de Melo <acme@kernel.org> wrote:

> From: Arnaldo Carvalho de Melo <acme@redhat.com>
> 
> This is just prep work to show the diff to the unmodified workload.

Looks good to me, just one comment below.

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

> 
> Cc: Adrian Hunter <adrian.hunter@intel.com>
> Cc: Andre Fredette <anfredet@redhat.com>
> Cc: Clark Williams <williams@redhat.com>
> Cc: Dave Tucker <datucker@redhat.com>
> Cc: Derek Barbosa <debarbos@redhat.com>
> Cc: Ian Rogers <irogers@google.com>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> ---
>  tools/perf/bench/uprobe.c | 27 ++++++++++++++++++++++++---
>  1 file changed, 24 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/bench/uprobe.c b/tools/perf/bench/uprobe.c
> index 707174220a76701f..60e7c43298d8cf56 100644
> --- a/tools/perf/bench/uprobe.c
> +++ b/tools/perf/bench/uprobe.c
> @@ -34,6 +34,29 @@ static const char * const bench_uprobe_usage[] = {
>  	NULL
>  };
>  
> +static int bench_uprobe_format__default_fprintf(const char *name, const char *unit, u64 diff, FILE *fp)
> +{
> +	static u64 baseline;
> +	s64 diff_to_baseline = diff - baseline;
> +	int printed = fprintf(fp, "# Executed %'d %s calls\n", loops, name);
> +
> +	printed += fprintf(fp, " %14s: %'" PRIu64 " %ss", "Total time", diff, unit);
> +
> +	if (baseline)
> +		printed += fprintf(fp, " %s%'" PRId64 " to baseline", diff_to_baseline > 0 ? "+" : "", diff_to_baseline);
> +
> +	printed += fprintf(fp, "\n\n %'.3f %ss/op", (double)diff / (double)loops, unit);

Just a nit, do we need to repeat (double) cast on the denominator side too?

> +
> +	if (baseline)
> +		printed += fprintf(fp, " %'.3f %ss/op to baseline", (double)diff_to_baseline / (double)loops, unit);
> +	else
> +		baseline = diff;
> +
> +	fputc('\n', fp);
> +
> +	return printed + 1;
> +}
> +
>  static int bench_uprobe(int argc, const char **argv)
>  {
>  	const char *name = "usleep(1000)", *unit = "usec";
> @@ -56,9 +79,7 @@ static int bench_uprobe(int argc, const char **argv)
>  
>  	switch (bench_format) {
>  	case BENCH_FORMAT_DEFAULT:
> -		printf("# Executed %'d %s calls\n", loops, name);
> -		printf(" %14s: %'" PRIu64 " %ss\n\n", "Total time", diff, unit);
> -		printf(" %'.3f %ss/op\n", (double)diff / (double)loops, unit);
> +		bench_uprobe_format__default_fprintf(name, unit, diff, stdout);
>  		break;
>  
>  	case BENCH_FORMAT_SIMPLE:
> -- 
> 2.41.0
> 


-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>