linux-kernel - Re: [PATCH v2] perf sched timehist: Fix use of CPU list with summary option

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Message-ID: <CAM9d7chxJ9hkCsL+PnJSFfKHwbjg6=D+RVDT6E7GWKwedwzGiQ@mail.gmail.com>
Date:   Tue, 18 Aug 2020 10:29:29 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     David Ahern <dsahern@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH v2] perf sched timehist: Fix use of CPU list with summary option

Hi David,

On Tue, Aug 18, 2020 at 2:09 AM David Ahern <dsahern@...nel.org> wrote:
>
> Do not update thread stats or show idle summary unless CPU is in
> the list of interest.
>
> Fixes: c30d630d1bcf ("perf sched timehist: Add support for filtering on CPU")
> Signed-off-by: David Ahern <dsahern@...nel.org>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks
Namhyung

> ---
> v2
> - check that cpu_list is set before checking cpu_bitmap in timehist_print_summary
>
>  tools/perf/builtin-sched.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 0c7d599fa555..e6fc297cee91 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -2584,7 +2584,8 @@ static int timehist_sched_change_event(struct perf_tool *tool,
>         }
>
>         if (!sched->idle_hist || thread->tid == 0) {
> -               timehist_update_runtime_stats(tr, t, tprev);
> +               if (!cpu_list || test_bit(sample->cpu, cpu_bitmap))
> +                       timehist_update_runtime_stats(tr, t, tprev);
>
>                 if (sched->idle_hist) {
>                         struct idle_thread_runtime *itr = (void *)tr;
> @@ -2857,6 +2858,9 @@ static void timehist_print_summary(struct perf_sched *sched,
>
>         printf("\nIdle stats:\n");
>         for (i = 0; i < idle_max_cpu; ++i) {
> +               if (cpu_list && !test_bit(i, cpu_bitmap))
> +                       continue;
> +
>                 t = idle_threads[i];
>                 if (!t)
>                         continue;
> --
> 2.17.1
>