linux-kernel - Re: [PATCH 2/3] perf lock: Add -q/--quiet option

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Date:   Fri, 23 Sep 2022 19:49:34 -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
Subject: Re: [PATCH 2/3] perf lock: Add -q/--quiet option

On Fri, Sep 23, 2022 at 5:42 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Like perf report, this option is to suppress header and debug messages.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

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

Thanks,
Ian

> ---
>  tools/perf/Documentation/perf-lock.txt |  4 ++++
>  tools/perf/builtin-lock.c              | 27 +++++++++++++++-----------
>  2 files changed, 20 insertions(+), 11 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt
> index b23e76200ac2..3b1e16563b79 100644
> --- a/tools/perf/Documentation/perf-lock.txt
> +++ b/tools/perf/Documentation/perf-lock.txt
> @@ -40,6 +40,10 @@ COMMON OPTIONS
>  --verbose::
>          Be more verbose (show symbol address, etc).
>
> +-q::
> +--quiet::
> +       Do not show any message. (Suppress -v)
> +
>  -D::
>  --dump-raw-trace::
>          Dump raw trace in ASCII.
> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> index 1c0d52384d9e..9722d4ab2e55 100644
> --- a/tools/perf/builtin-lock.c
> +++ b/tools/perf/builtin-lock.c
> @@ -1250,7 +1250,7 @@ static void print_bad_events(int bad, int total)
>         for (i = 0; i < BROKEN_MAX; i++)
>                 broken += bad_hist[i];
>
> -       if (broken == 0 && !verbose)
> +       if (quiet || (broken == 0 && !verbose))
>                 return;
>
>         pr_info("\n=== output for debug===\n\n");
> @@ -1269,10 +1269,12 @@ static void print_result(void)
>         char cut_name[20];
>         int bad, total, printed;
>
> -       pr_info("%20s ", "Name");
> -       list_for_each_entry(key, &lock_keys, list)
> -               pr_info("%*s ", key->len, key->header);
> -       pr_info("\n\n");
> +       if (!quiet) {
> +               pr_info("%20s ", "Name");
> +               list_for_each_entry(key, &lock_keys, list)
> +                       pr_info("%*s ", key->len, key->header);
> +               pr_info("\n\n");
> +       }
>
>         bad = total = printed = 0;
>         while ((st = pop_from_result())) {
> @@ -1482,13 +1484,15 @@ static void print_contention_result(struct lock_contention *con)
>         struct lock_key *key;
>         int bad, total, printed;
>
> -       list_for_each_entry(key, &lock_keys, list)
> -               pr_info("%*s ", key->len, key->header);
> +       if (!quiet) {
> +               list_for_each_entry(key, &lock_keys, list)
> +                       pr_info("%*s ", key->len, key->header);
>
> -       if (show_thread_stats)
> -               pr_info("  %10s   %s\n\n", "pid", "comm");
> -       else
> -               pr_info("  %10s   %s\n\n", "type", "caller");
> +               if (show_thread_stats)
> +                       pr_info("  %10s   %s\n\n", "pid", "comm");
> +               else
> +                       pr_info("  %10s   %s\n\n", "type", "caller");
> +       }
>
>         bad = total = printed = 0;
>         if (use_bpf)
> @@ -1865,6 +1869,7 @@ int cmd_lock(int argc, const char **argv)
>                    "file", "vmlinux pathname"),
>         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
>                    "file", "kallsyms pathname"),
> +       OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
>         OPT_END()
>         };
>
> --
> 2.37.3.998.g577e59143f-goog
>