linux-kernel - Re: [PATCH 1/1] perf report TUI: Remove needless 'dummy' event from menu

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Date:   Fri, 3 Jul 2020 22:44:28 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] perf report TUI: Remove needless 'dummy' event from menu

Hi Arnaldo,

On Fri, Jul 3, 2020 at 9:34 PM Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
>
> Please Ack,
>
> - Arnaldo
>
> ----
>
> Fixing the common case of:
>
>   perf record
>   perf report
>
> And getting just the cycles events.
>
> We now have a 'dummy' event to get perf metadata events that take place
> while we synthesize metadata records for pre-existing processes by
> traversing procfs, so we always have this extra 'dummy' evsel, but we
> don't have to offer it as there will be no samples on it, remove this
> distraction.
>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/ui/browsers/hists.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index 4cd556c1276f..be9c4c0549bc 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -3603,6 +3603,23 @@ static int __perf_evlist__tui_browse_hists(struct evlist *evlist,
>                                     hbt, warn_lost_event);
>  }
>
> +static bool perf_evlist__single_entry(struct evlist *evlist)
> +{
> +       int nr_entries = evlist->core.nr_entries;
> +
> +       if (nr_entries == 1)
> +              return true;
> +
> +       if (nr_entries == 2) {
> +               struct evsel *last = evlist__last(evlist);
> +
> +               if (evsel__is_dummy_event(last))
> +                       return true;
> +       }
> +
> +       return false;
> +}
> +
>  int perf_evlist__tui_browse_hists(struct evlist *evlist, const char *help,
>                                   struct hist_browser_timer *hbt,
>                                   float min_pcnt,
> @@ -3613,7 +3630,7 @@ int perf_evlist__tui_browse_hists(struct evlist *evlist, const char *help,
>         int nr_entries = evlist->core.nr_entries;
>
>  single_entry:
> -       if (nr_entries == 1) {
> +       if (perf_evlist__single_entry(evlist)) {

But I think it cannot cover the event group case below..

Thanks
Namhyung


>                 struct evsel *first = evlist__first(evlist);
>
>                 return perf_evsel__hists_browse(first, nr_entries, help,
> --
> 2.21.3
>