linux-kernel - Re: [PATCH v2 02/11] perf c2c: Add dimensions for load hit

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Message-ID: <CAM9d7ch+N++TDvq57+f6VwCx66YBtU4dNc-MdbsVEkTmoM0_0w@mail.gmail.com>
Date:   Wed, 6 Jan 2021 16:38:19 +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 02/11] perf c2c: Add dimensions for load hit

On Sun, Dec 13, 2020 at 10:39 PM Leo Yan <leo.yan@...aro.org> wrote:
>
> Add dimensions for load hit and its percentage calculation, which is to
> be displayed in the single cache line output.
>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  tools/perf/builtin-c2c.c | 71 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
>
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index 3d5a2dc8b4fd..00014e3d81fa 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -1052,6 +1052,58 @@ percent_lcl_hitm_cmp(struct perf_hpp_fmt *fmt __maybe_unused,
>         return per_left - per_right;
>  }
>
> +static double percent_ld_hit(struct c2c_hist_entry *c2c_he)
> +{
> +       struct c2c_hists *hists;
> +       int tot, st;
> +
> +       hists = container_of(c2c_he->he.hists, struct c2c_hists, hists);
> +
> +       st  = TOT_LD_HIT(&c2c_he->stats);
> +       tot = TOT_LD_HIT(&hists->stats);
> +
> +       return percent(st, tot);

It's not clear to me what's different than percent_tot_ld_hit().

Thanks,
Namhyung



> +}
> +
> +static int
> +percent_ld_hit_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
> +                    struct hist_entry *he)
> +{
> +       struct c2c_hist_entry *c2c_he;
> +       int width = c2c_width(fmt, hpp, he->hists);
> +       char buf[10];
> +       double per;
> +
> +       c2c_he = container_of(he, struct c2c_hist_entry, he);
> +       per = percent_ld_hit(c2c_he);
> +       return scnprintf(hpp->buf, hpp->size, "%*s", width, PERC_STR(buf, per));
> +}
> +
> +static int
> +percent_ld_hit_color(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
> +                    struct hist_entry *he)
> +{
> +       return percent_color(fmt, hpp, he, percent_ld_hit);
> +}
> +
> +static int64_t
> +percent_ld_hit_cmp(struct perf_hpp_fmt *fmt __maybe_unused,
> +                  struct hist_entry *left, struct hist_entry *right)
> +{
> +       struct c2c_hist_entry *c2c_left;
> +       struct c2c_hist_entry *c2c_right;
> +       double per_left;
> +       double per_right;
> +
> +       c2c_left  = container_of(left, struct c2c_hist_entry, he);
> +       c2c_right = container_of(right, struct c2c_hist_entry, he);
> +
> +       per_left  = percent_ld_hit(c2c_left);
> +       per_right = percent_ld_hit(c2c_right);
> +
> +       return per_left - per_right;
> +}
> +
>  static int
>  percent_stores_l1hit_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
>                            struct hist_entry *he)
> @@ -1417,6 +1469,14 @@ static struct c2c_dimension dim_cl_rmt_hitm = {
>         .width          = 7,
>  };
>
> +static struct c2c_dimension dim_cl_tot_ld_hit = {
> +       .header         = HEADER_SPAN("--- Load ---", "Hit", 1),
> +       .name           = "cl_tot_ld_hit",
> +       .cmp            = tot_ld_hit_cmp,
> +       .entry          = tot_ld_hit_entry,
> +       .width          = 7,
> +};
> +
>  static struct c2c_dimension dim_cl_lcl_hitm = {
>         .header         = HEADER_SPAN_LOW("Lcl"),
>         .name           = "cl_lcl_hitm",
> @@ -1570,6 +1630,15 @@ static struct c2c_dimension dim_percent_tot_ld_hit = {
>         .width          = 8,
>  };
>
> +static struct c2c_dimension dim_percent_ld_hit = {
> +       .header         = HEADER_SPAN("--  Load Refs --", "Hit", 1),
> +       .name           = "percent_ld_hit",
> +       .cmp            = percent_ld_hit_cmp,
> +       .entry          = percent_ld_hit_entry,
> +       .color          = percent_ld_hit_color,
> +       .width          = 7,
> +};
> +
>  static struct c2c_dimension dim_percent_stores_l1hit = {
>         .header         = HEADER_SPAN("-- Store Refs --", "L1 Hit", 1),
>         .name           = "percent_stores_l1hit",
> @@ -1715,6 +1784,7 @@ static struct c2c_dimension *dimensions[] = {
>         &dim_rmt_hitm,
>         &dim_cl_lcl_hitm,
>         &dim_cl_rmt_hitm,
> +       &dim_cl_tot_ld_hit,
>         &dim_tot_stores,
>         &dim_stores_l1hit,
>         &dim_stores_l1miss,
> @@ -1731,6 +1801,7 @@ static struct c2c_dimension *dimensions[] = {
>         &dim_percent_hitm,
>         &dim_percent_rmt_hitm,
>         &dim_percent_lcl_hitm,
> +       &dim_percent_ld_hit,
>         &dim_percent_tot_ld_hit,
>         &dim_percent_stores_l1hit,
>         &dim_percent_stores_l1miss,
> --
> 2.17.1
>