linux-kernel - Re: [PATCH V1 23/23] perf tools: Allow system-wide events to keep their own threads

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Date:   Thu, 5 May 2022 17:51:11 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 23/23] perf tools: Allow system-wide events to keep
 their own threads

On Thu, May 5, 2022 at 9:58 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> System-wide events do not have threads, so do not propagate threads to
> them.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

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

Thanks,
Ian

> ---
>  tools/lib/perf/evlist.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
> index da30e88c76b9..fe75d2cf3696 100644
> --- a/tools/lib/perf/evlist.c
> +++ b/tools/lib/perf/evlist.c
> @@ -52,8 +52,11 @@ static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
>                 evsel->cpus = perf_cpu_map__get(evsel->own_cpus);
>         }
>
> -       perf_thread_map__put(evsel->threads);
> -       evsel->threads = perf_thread_map__get(evlist->threads);
> +       if (!evsel->system_wide) {
> +               perf_thread_map__put(evsel->threads);
> +               evsel->threads = perf_thread_map__get(evlist->threads);
> +       }
> +
>         evlist->all_cpus = perf_cpu_map__merge(evlist->all_cpus, evsel->cpus);
>  }
>
> --
> 2.25.1
>