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

[Namhyung Kim]

On Sun, Dec 13, 2020 at 10:39 PM Leo Yan <leo.yan@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
>  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
>