linux-kernel - Re: [PATCH 1/2] libperf: Add perf_evlist__reset_id

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Date:   Wed, 24 Feb 2021 17:42:15 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH 1/2] libperf: Add perf_evlist__reset_id_hash()

On Wed, Feb 24, 2021 at 5:11 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Add the perf_evlist__reset_id_hash() function to libperf API so that
> it can be called to reset the hash table.  This is necessary for perf
> stat to run the workload multiple times.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
[SNIP]
> diff --git a/tools/lib/perf/libperf.map b/tools/lib/perf/libperf.map
> index 7be1af8a546c..285100143d89 100644
> --- a/tools/lib/perf/libperf.map
> +++ b/tools/lib/perf/libperf.map
> @@ -42,6 +42,7 @@ LIBPERF_0.0.1 {
>                 perf_evlist__munmap;
>                 perf_evlist__filter_pollfd;
>                 perf_evlist__next_mmap;
> +               perf_evlist__reset_id_hash;
>                 perf_mmap__consume;
>                 perf_mmap__read_init;
>                 perf_mmap__read_done;

I saw perf_evsel__free_fd and perf_evsel__free_id is called from
util/evlist.c without being listed here.  Do we need to add them?

Thanks,
Namhyung