linux-kernel - Re: [PATCH 18/19] perf stat: Display percore events properly

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Message-ID: <CAP-5=fUi7O8Eu_00Z4KwiPiF3X7t6FpPB2AnKv0pqY7hA4_68A@mail.gmail.com>
Date:   Mon, 10 Oct 2022 16:39:48 -0700
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>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        James Clark <james.clark@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>
Subject: Re: [PATCH 18/19] perf stat: Display percore events properly

On Sun, Oct 9, 2022 at 10:36 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> The recent change in the perf stat broke the percore event display.
> Note that the aggr counts are already processed so that the every
> sibling thread in the same core will get the per-core counter values.

Could we add a test given this has broken once?

> Check percore evsels and skip the sibling threads in the display.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

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

Thanks,
Ian

> ---
>  tools/perf/builtin-stat.c      | 16 ----------------
>  tools/perf/util/stat-display.c | 27 +++++++++++++++++++++++++--
>  2 files changed, 25 insertions(+), 18 deletions(-)
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index d92815f4eae0..b3a39d4c86a7 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -1403,18 +1403,6 @@ static struct aggr_cpu_id perf_stat__get_cpu_cached(struct perf_stat_config *con
>         return perf_stat__get_aggr(config, perf_stat__get_cpu, cpu);
>  }
>
> -static bool term_percore_set(void)
> -{
> -       struct evsel *counter;
> -
> -       evlist__for_each_entry(evsel_list, counter) {
> -               if (counter->percore)
> -                       return true;
> -       }
> -
> -       return false;
> -}
> -
>  static aggr_cpu_id_get_t aggr_mode__get_aggr(enum aggr_mode aggr_mode)
>  {
>         switch (aggr_mode) {
> @@ -1427,8 +1415,6 @@ static aggr_cpu_id_get_t aggr_mode__get_aggr(enum aggr_mode aggr_mode)
>         case AGGR_NODE:
>                 return aggr_cpu_id__node;
>         case AGGR_NONE:
> -               if (term_percore_set())
> -                       return aggr_cpu_id__core;
>                 return aggr_cpu_id__cpu;;
>         case AGGR_GLOBAL:
>                 return aggr_cpu_id__global;
> @@ -1452,8 +1438,6 @@ static aggr_get_id_t aggr_mode__get_id(enum aggr_mode aggr_mode)
>         case AGGR_NODE:
>                 return perf_stat__get_node_cached;
>         case AGGR_NONE:
> -               if (term_percore_set())
> -                       return perf_stat__get_core_cached;
>                 return perf_stat__get_cpu_cached;
>         case AGGR_GLOBAL:
>                 return perf_stat__get_global_cached;
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index 0c0e22c175a1..e0c0df99d40d 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -1094,7 +1094,8 @@ static void print_percore(struct perf_stat_config *config,
>  {
>         bool metric_only = config->metric_only;
>         FILE *output = config->output;
> -       int s;
> +       struct cpu_aggr_map *core_map;
> +       int s, c, i;
>         bool first = true;
>
>         if (!config->aggr_map || !config->aggr_get_id)
> @@ -1103,13 +1104,35 @@ static void print_percore(struct perf_stat_config *config,
>         if (config->percore_show_thread)
>                 return print_counter(config, counter, prefix);
>
> -       for (s = 0; s < config->aggr_map->nr; s++) {
> +       core_map = cpu_aggr_map__empty_new(config->aggr_map->nr);
> +       if (core_map == NULL) {
> +               fprintf(output, "Cannot allocate per-core aggr map for display\n");
> +               return;
> +       }
> +
> +       for (s = 0, c = 0; s < config->aggr_map->nr; s++) {
> +               struct perf_cpu curr_cpu = config->aggr_map->map[s].cpu;
> +               struct aggr_cpu_id core_id = aggr_cpu_id__core(curr_cpu, NULL);
> +               bool found = false;
> +
> +               for (i = 0; i < c; i++) {
> +                       if (aggr_cpu_id__equal(&core_map->map[i], &core_id)) {
> +                               found = true;
> +                               break;
> +                       }
> +               }
> +               if (found)
> +                       continue;
> +
>                 if (prefix && metric_only)
>                         fprintf(output, "%s", prefix);
>
>                 print_counter_aggrdata(config, counter, s,
>                                        prefix, metric_only, &first);
> +
> +               core_map->map[c++] = core_id;
>         }
> +       free(core_map);
>
>         if (metric_only)
>                 fputc('\n', output);
> --
> 2.38.0.rc1.362.ged0d419d3c-goog
>