linux-kernel - Re: [PATCH v10 04/15] perf evlist: introduce control file descriptors

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Message-ID: <CAM9d7cj86U7xcmAdiKjEKNp+qS_YAP72xKusAjLWGo2frxpL_A@mail.gmail.com>
Date:   Mon, 13 Jul 2020 12:13:34 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 04/15] perf evlist: introduce control file descriptors

Hello,

On Wed, Jul 8, 2020 at 4:47 PM Alexey Budankov
<alexey.budankov@...ux.intel.com> wrote:
>
>
> Define and initialize control file descriptors.
>
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/util/evlist.c | 3 +++
>  tools/perf/util/evlist.h | 5 +++++
>  2 files changed, 8 insertions(+)
>
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index bcbe0cb8482e..36eb50aba1f5 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -63,6 +63,9 @@ void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
>         perf_evlist__set_maps(&evlist->core, cpus, threads);
>         evlist->workload.pid = -1;
>         evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
> +       evlist->ctl_fd.fd = -1;
> +       evlist->ctl_fd.ack = -1;
> +       evlist->ctl_fd.pos = -1;
>  }
>
>  struct evlist *evlist__new(void)
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index 38901c0d1599..2caf19fb87a8 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -74,6 +74,11 @@ struct evlist {
>                 pthread_t               th;
>                 volatile int            done;
>         } thread;
> +       struct {
> +               int     fd;
> +               int     ack;
> +               int     pos;
> +       } ctl_fd;

Could you please add brief descriptions for each field
in the comment?  It's not obvious to me other than fd.

Thanks
Namhyung


>  };
>
>  struct evsel_str_handler {
> --
> 2.24.1
>
>