linux-kernel - Re: [PATCH 4/6] perf stat: Use thread map index for shadow stat

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Date:   Wed, 28 Sep 2022 19:10:19 -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, Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>
Subject: Re: [PATCH 4/6] perf stat: Use thread map index for shadow stat

On Mon, Sep 26, 2022 at 1:08 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> When AGGR_THREAD is active, it aggregates the values for each thread.
> Previously it used cpu map index which is invalid for AGGR_THREAD so
> it had to use separate runtime stats with index 0.
>
> But it can just use the rt_stat with thread_map_index.  Rename the
> first_shadow_map_idx() and make it return the thread index.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/stat-display.c | 20 +++++++++-----------
>  tools/perf/util/stat.c         |  8 ++------
>  2 files changed, 11 insertions(+), 17 deletions(-)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index 234491f43c36..570e2c04d47d 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -442,7 +442,7 @@ static void print_metric_header(struct perf_stat_config *config,
>                 fprintf(os->fh, "%*s ", config->metric_only_len, unit);
>  }
>
> -static int first_shadow_cpu_map_idx(struct perf_stat_config *config,
> +static int first_shadow_map_idx(struct perf_stat_config *config,
>                                 struct evsel *evsel, const struct aggr_cpu_id *id)
>  {
>         struct perf_cpu_map *cpus = evsel__cpus(evsel);
> @@ -452,6 +452,9 @@ static int first_shadow_cpu_map_idx(struct perf_stat_config *config,
>         if (config->aggr_mode == AGGR_NONE)
>                 return perf_cpu_map__idx(cpus, id->cpu);
>
> +       if (config->aggr_mode == AGGR_THREAD)
> +               return id->thread;

The function's name implies returning an index but that isn't clear
here. Can we change the aggr_cpu_id's thread to be called thread_idx?

Thanks,
Ian

> +
>         if (!config->aggr_get_id)
>                 return 0;
>
> @@ -646,7 +649,7 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int
>         }
>
>         perf_stat__print_shadow_stats(config, counter, uval,
> -                               first_shadow_cpu_map_idx(config, counter, &id),
> +                               first_shadow_map_idx(config, counter, &id),
>                                 &out, &config->metric_events, st);
>         if (!config->csv_output && !config->metric_only && !config->json_output) {
>                 print_noise(config, counter, noise);
> @@ -676,7 +679,7 @@ static void aggr_update_shadow(struct perf_stat_config *config,
>                                 val += perf_counts(counter->counts, idx, 0)->val;
>                         }
>                         perf_stat__update_shadow_stats(counter, val,
> -                                       first_shadow_cpu_map_idx(config, counter, &id),
> +                                       first_shadow_map_idx(config, counter, &id),
>                                         &rt_stat);
>                 }
>         }
> @@ -979,14 +982,9 @@ static void print_aggr_thread(struct perf_stat_config *config,
>                         fprintf(output, "%s", prefix);
>
>                 id = buf[thread].id;
> -               if (config->stats)
> -                       printout(config, id, 0, buf[thread].counter, buf[thread].uval,
> -                                prefix, buf[thread].run, buf[thread].ena, 1.0,
> -                                &config->stats[id.thread]);
> -               else
> -                       printout(config, id, 0, buf[thread].counter, buf[thread].uval,
> -                                prefix, buf[thread].run, buf[thread].ena, 1.0,
> -                                &rt_stat);
> +               printout(config, id, 0, buf[thread].counter, buf[thread].uval,
> +                        prefix, buf[thread].run, buf[thread].ena, 1.0,
> +                        &rt_stat);
>                 fputc('\n', output);
>         }
>
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index e1d3152ce664..21137c9d5259 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -389,12 +389,8 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
>                 }
>
>                 if (config->aggr_mode == AGGR_THREAD) {
> -                       if (config->stats)
> -                               perf_stat__update_shadow_stats(evsel,
> -                                       count->val, 0, &config->stats[thread]);
> -                       else
> -                               perf_stat__update_shadow_stats(evsel,
> -                                       count->val, 0, &rt_stat);
> +                       perf_stat__update_shadow_stats(evsel, count->val,
> +                                                      thread, &rt_stat);
>                 }
>                 break;
>         case AGGR_GLOBAL:
> --
> 2.37.3.998.g577e59143f-goog
>