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

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Date:   Tue, 11 Oct 2022 16:46:40 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
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 <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 Mon, Oct 10, 2022 at 4:17 PM Ian Rogers <irogers@...gle.com> wrote:
>
> 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.

thread_map_idx ? ;-)  I think we need to rename it separately.

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

Thanks,
Namhyung


>
> > +       }
> > +
> >         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
> >