linux-kernel - Re: [PATCH v6 4/4] perf-stat: add documentation for -b option

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Date:   Tue, 29 Dec 2020 16:24:53 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Song Liu <songliubraving@...com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, kernel-team@...com
Subject: Re: [PATCH v6 4/4] perf-stat: add documentation for -b option

On Tue, Dec 29, 2020 at 2:41 AM Song Liu <songliubraving@...com> wrote:
>
> Add documentation to perf-stat -b option, which stats event for BPF
> programs.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  tools/perf/Documentation/perf-stat.txt | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
> index 5d4a673d7621a..15b9a646e853d 100644
> --- a/tools/perf/Documentation/perf-stat.txt
> +++ b/tools/perf/Documentation/perf-stat.txt
> @@ -75,6 +75,20 @@ report::
>  --tid=<tid>::
>          stat events on existing thread id (comma separated list)
>
> +-b::
> +--bpf-prog::
> +        stat events on existing bpf program id (comma separated list),
> +        requiring root righs. For example:

Typo: rights

It'd be nice if it can show how we can get the id.

Thanks,
Namhyung


> +
> +  # perf stat -e cycles,instructions --bpf-prog 17247 --timeout 1000
> +
> +   Performance counter stats for 'BPF program(s) 17247':
> +
> +             85,967      cycles
> +             28,982      instructions              #    0.34  insn per cycle
> +
> +        1.102235068 seconds time elapsed
> +
>  ifdef::HAVE_LIBPFM[]
>  --pfm-events events::
>  Select a PMU event using libpfm4 syntax (see http://perfmon2.sf.net)
> --
> 2.24.1
>