linux-kernel - Re: [PATCH 10/19] perf stat: Aggregate per-thread stats using evsel->stats->aggr

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Date:   Mon, 10 Oct 2022 16:17:24 -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 10/19] perf stat: Aggregate per-thread stats using evsel->stats->aggr

On Sun, Oct 9, 2022 at 10:36 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Per-thread aggregation doesn't use the CPU numbers but the logic should
> be the same.  Initialize cpu_aggr_map separately for AGGR_THREAD and use
> thread map idx to aggregate counter values.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-stat.c | 31 +++++++++++++++++++++++++++++++
>  tools/perf/util/stat.c    | 19 +++++++++++++++++++
>  2 files changed, 50 insertions(+)
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 139e35ed68d3..c76240cfc635 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -1468,6 +1468,21 @@ static int perf_stat_init_aggr_mode(void)
>                 stat_config.aggr_get_id = aggr_mode__get_id(stat_config.aggr_mode);
>         }
>
> +       if (stat_config.aggr_mode == AGGR_THREAD) {
> +               nr = perf_thread_map__nr(evsel_list->core.threads);
> +               stat_config.aggr_map = cpu_aggr_map__empty_new(nr);
> +               if (stat_config.aggr_map == NULL)
> +                       return -ENOMEM;
> +
> +               for (int s = 0; s < nr; s++) {
> +                       struct aggr_cpu_id id = aggr_cpu_id__empty();
> +
> +                       id.thread_idx = s;
> +                       stat_config.aggr_map->map[s] = id;
> +               }
> +               return 0;
> +       }
> +
>         /*
>          * The evsel_list->cpus is the base we operate on,
>          * taking the highest cpu number to be the size of
> @@ -1677,6 +1692,22 @@ static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
>         aggr_cpu_id_get_t get_id = aggr_mode__get_aggr_file(stat_config.aggr_mode);
>         bool needs_sort = stat_config.aggr_mode != AGGR_NONE;
>
> +       if (stat_config.aggr_mode == AGGR_THREAD) {
> +               int nr = perf_thread_map__nr(evsel_list->core.threads);
> +
> +               stat_config.aggr_map = cpu_aggr_map__empty_new(nr);
> +               if (stat_config.aggr_map == NULL)
> +                       return -ENOMEM;
> +
> +               for (int s = 0; s < nr; s++) {
> +                       struct aggr_cpu_id id = aggr_cpu_id__empty();
> +
> +                       id.thread_idx = s;
> +                       stat_config.aggr_map->map[s] = id;
> +               }
> +               return 0;
> +       }
> +
>         if (!get_id)
>                 return 0;
>
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index 99874254809d..013dbe1c5d28 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -403,6 +403,24 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
>                 evsel__compute_deltas(evsel, cpu_map_idx, thread, count);
>         perf_counts_values__scale(count, config->scale, NULL);
>
> +       if (config->aggr_mode == AGGR_THREAD) {
> +               struct perf_counts_values *aggr_counts = &ps->aggr[thread].counts;
> +
> +               /*
> +                * Skip value 0 when enabling --per-thread globally,
> +                * otherwise too many 0 output.
> +                */
> +               if (count->val == 0 && config->system_wide)
> +                       return 0;
> +
> +               ps->aggr[thread].nr++;
> +
> +               aggr_counts->val += count->val;
> +               aggr_counts->ena += count->ena;
> +               aggr_counts->run += count->run;
> +               goto update;

nit: perhaps there is a more intention revealing name than update here.

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

Thanks,
Ian

> +       }
> +
>         if (ps->aggr) {
>                 struct perf_cpu cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx);
>                 struct aggr_cpu_id aggr_id = config->aggr_get_id(config, cpu);
> @@ -437,6 +455,7 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
>                 }
>         }
>
> +update:
>         switch (config->aggr_mode) {
>         case AGGR_THREAD:
>         case AGGR_CORE:
> --
> 2.38.0.rc1.362.ged0d419d3c-goog
>