linux-kernel - Re: [PATCH 19/19] perf stat: Remove unused perf

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Date:   Mon, 10 Oct 2022 16:40:25 -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 19/19] perf stat: Remove unused perf_counts.aggr field

On Sun, Oct 9, 2022 at 10:36 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> The aggr field in the struct perf_counts is to keep the aggregated value
> in the AGGR_GLOBAL for the old code.  But it's not used anymore.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/counts.c |  1 -
>  tools/perf/util/counts.h |  1 -
>  tools/perf/util/stat.c   | 35 ++---------------------------------
>  3 files changed, 2 insertions(+), 35 deletions(-)

Very nice!

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

Thanks,
Ian

>
> diff --git a/tools/perf/util/counts.c b/tools/perf/util/counts.c
> index 7a447d918458..11cd85b278a6 100644
> --- a/tools/perf/util/counts.c
> +++ b/tools/perf/util/counts.c
> @@ -48,7 +48,6 @@ void perf_counts__reset(struct perf_counts *counts)
>  {
>         xyarray__reset(counts->loaded);
>         xyarray__reset(counts->values);
> -       memset(&counts->aggr, 0, sizeof(struct perf_counts_values));
>  }
>
>  void evsel__reset_counts(struct evsel *evsel)
> diff --git a/tools/perf/util/counts.h b/tools/perf/util/counts.h
> index 5de275194f2b..42760242e0df 100644
> --- a/tools/perf/util/counts.h
> +++ b/tools/perf/util/counts.h
> @@ -11,7 +11,6 @@ struct evsel;
>
>  struct perf_counts {
>         s8                        scaled;
> -       struct perf_counts_values aggr;
>         struct xyarray            *values;
>         struct xyarray            *loaded;
>  };
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index 1652586a4925..0dccfa273fa7 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -307,8 +307,6 @@ static void evsel__copy_prev_raw_counts(struct evsel *evsel)
>                                 *perf_counts(evsel->prev_raw_counts, idx, thread);
>                 }
>         }
> -
> -       evsel->counts->aggr = evsel->prev_raw_counts->aggr;
>  }
>
>  void evlist__copy_prev_raw_counts(struct evlist *evlist)
> @@ -319,26 +317,6 @@ void evlist__copy_prev_raw_counts(struct evlist *evlist)
>                 evsel__copy_prev_raw_counts(evsel);
>  }
>
> -void evlist__save_aggr_prev_raw_counts(struct evlist *evlist)
> -{
> -       struct evsel *evsel;
> -
> -       /*
> -        * To collect the overall statistics for interval mode,
> -        * we copy the counts from evsel->prev_raw_counts to
> -        * evsel->counts. The perf_stat_process_counter creates
> -        * aggr values from per cpu values, but the per cpu values
> -        * are 0 for AGGR_GLOBAL. So we use a trick that saves the
> -        * previous aggr value to the first member of perf_counts,
> -        * then aggr calculation in process_counter_values can work
> -        * correctly.
> -        */
> -       evlist__for_each_entry(evlist, evsel) {
> -               *perf_counts(evsel->prev_raw_counts, 0, 0) =
> -                       evsel->prev_raw_counts->aggr;
> -       }
> -}
> -
>  static size_t pkg_id_hash(const void *__key, void *ctx __maybe_unused)
>  {
>         uint64_t *key = (uint64_t *) __key;
> @@ -422,7 +400,6 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
>                        int cpu_map_idx, int thread,
>                        struct perf_counts_values *count)
>  {
> -       struct perf_counts_values *aggr = &evsel->counts->aggr;
>         struct perf_stat_evsel *ps = evsel->stats;
>         static struct perf_counts_values zero;
>         bool skip = false;
> @@ -491,12 +468,6 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
>                 }
>         }
>
> -       if (config->aggr_mode == AGGR_GLOBAL) {
> -               aggr->val += count->val;
> -               aggr->ena += count->ena;
> -               aggr->run += count->run;
> -       }
> -
>         return 0;
>  }
>
> @@ -521,13 +492,10 @@ static int process_counter_maps(struct perf_stat_config *config,
>  int perf_stat_process_counter(struct perf_stat_config *config,
>                               struct evsel *counter)
>  {
> -       struct perf_counts_values *aggr = &counter->counts->aggr;
>         struct perf_stat_evsel *ps = counter->stats;
> -       u64 *count = counter->counts->aggr.values;
> +       u64 *count;
>         int ret;
>
> -       aggr->val = aggr->ena = aggr->run = 0;
> -
>         if (counter->per_pkg)
>                 evsel__zero_per_pkg(counter);
>
> @@ -538,6 +506,7 @@ int perf_stat_process_counter(struct perf_stat_config *config,
>         if (config->aggr_mode != AGGR_GLOBAL)
>                 return 0;
>
> +       count = ps->aggr[0].counts.values;
>         update_stats(&ps->res_stats, *count);
>
>         if (verbose > 0) {
> --
> 2.38.0.rc1.362.ged0d419d3c-goog
>