linux-kernel - Re: [PATCH v2 06/11] perf c2c: Refactor display filter macro

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Message-ID: <CAM9d7cgg07RCthbLohwDiw4yvTdzR9ZZfRpZ5PgEg24EQiz_Ow@mail.gmail.com>
Date:   Wed, 6 Jan 2021 16:47:00 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Joe Mario <jmario@...hat.com>, David Ahern <dsahern@...il.com>,
        Don Zickus <dzickus@...hat.com>, Al Grant <Al.Grant@....com>,
        James Clark <james.clark@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/11] perf c2c: Refactor display filter macro

On Sun, Dec 13, 2020 at 10:39 PM Leo Yan <leo.yan@...aro.org> wrote:
>
> When sort on the respective metrics (lcl_hitm, rmt_hitm, tot_hitm),
> macro FILTER_HITM is to filter out the cache line entries if its
> overhead is less than 1%.
>
> This patch is to refactor macro FILTER_HITM.  It uses more gernal name
> FILTER_DISPLAY to replace the old name; and refines its parameter,
> rather than passing field name for the data structure, it changes to
> pass the cache line's statistic value and the sum value, this is more
> flexsible, e.g. if consider to extend for sorting on all load hits
> which combines multiple fields from structure c2c_stats.

As it doesn't use field names anymore, I think it's better to change it to
a static function.

Thanks,
Namhyung


>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  tools/perf/builtin-c2c.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index 5cd30c083d6c..f11c3c84bb2b 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -2151,24 +2151,27 @@ static bool he__display(struct hist_entry *he, struct c2c_stats *stats)
>
>         c2c_he = container_of(he, struct c2c_hist_entry, he);
>
> -#define FILTER_HITM(__h)                                               \
> -       if (stats->__h) {                                               \
> -               ld_dist = ((double)c2c_he->stats.__h / stats->__h);     \
> +#define FILTER_DISPLAY(val, sum)                                       \
> +{                                                                      \
> +       if ((sum)) {                                                    \
> +               ld_dist = ((double)(val) / (sum));                      \
>                 if (ld_dist < DISPLAY_LINE_LIMIT)                       \
>                         he->filtered = HIST_FILTER__C2C;                \
>         } else {                                                        \
>                 he->filtered = HIST_FILTER__C2C;                        \
> -       }
> +       }                                                               \
> +}
>
>         switch (c2c.display) {
>         case DISPLAY_LCL:
> -               FILTER_HITM(lcl_hitm);
> +               FILTER_DISPLAY(c2c_he->stats.lcl_hitm, stats->lcl_hitm);
>                 break;
>         case DISPLAY_RMT:
> -               FILTER_HITM(rmt_hitm);
> +               FILTER_DISPLAY(c2c_he->stats.rmt_hitm, stats->rmt_hitm);
>                 break;
>         case DISPLAY_TOT:
> -               FILTER_HITM(tot_hitm);
> +               FILTER_DISPLAY(c2c_he->stats.tot_hitm, stats->tot_hitm);
> +               break;
>         default:
>                 break;
>         }
> --
> 2.17.1
>