linux-kernel - Re: [PATCH v3 4/9] perf mem: Only initialize memory event for recording

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Date:   Thu, 29 Oct 2020 18:04:17 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Kemeng Shi <shikemeng@...wei.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Al Grant <Al.Grant@....com>, James Clark <james.clark@....com>,
        Wei Li <liwei391@...wei.com>,
        André Przywara <andre.przywara@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 4/9] perf mem: Only initialize memory event for recording

On Tue, Oct 27, 2020 at 11:38 PM Leo Yan <leo.yan@...aro.org> wrote:
>
> It's needless to initialize memory events for reporting, this patch
> moves memory event initialization for only recording.  Furthermore,
> the change allows to parse perf data on cross platforms, e.g. perf
> tool can report result properly even the machine doesn't support
> the memory events.
>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

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

Thanks,
Ian

> ---
>  tools/perf/builtin-mem.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
> index 31144f586e77..f3dc2d2b879c 100644
> --- a/tools/perf/builtin-mem.c
> +++ b/tools/perf/builtin-mem.c
> @@ -78,6 +78,11 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
>         OPT_END()
>         };
>
> +       if (perf_mem_events__init()) {
> +               pr_err("failed: memory events not supported\n");
> +               return -1;
> +       }
> +
>         argc = parse_options(argc, argv, options, record_mem_usage,
>                              PARSE_OPT_KEEP_UNKNOWN);
>
> @@ -436,11 +441,6 @@ int cmd_mem(int argc, const char **argv)
>                 NULL
>         };
>
> -       if (perf_mem_events__init()) {
> -               pr_err("failed: memory events not supported\n");
> -               return -1;
> -       }
> -
>         argc = parse_options_subcommand(argc, argv, mem_options, mem_subcommands,
>                                         mem_usage, PARSE_OPT_KEEP_UNKNOWN);
>
> --
> 2.17.1
>