linux-kernel - Re: [PATCH 14/15] perf stat: Rename "aggregate-number" to "cpu-count" in JSON

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Date:   Wed, 23 Nov 2022 15:30:56 -0800
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,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        James Clark <james.clark@....com>,
        Athira Jajeev <atrajeev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 14/15] perf stat: Rename "aggregate-number" to "cpu-count"
 in JSON

On Wed, Nov 23, 2022 at 10:02 AM Namhyung Kim <namhyung@...nel.org> wrote:
>
> As the JSON output has been broken for a little while, I guess there are
> not many users.  Let's rename the field to more intuitive one. :)

I'm not sure cpu-count is accurate. For example, an uncore counter in
a dual socket machine may have a CPU mask of "0, 36", ie one event per
socket. The aggregate-number in this case I believe is 2.

Thanks,
Ian

> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/stat-display.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index 43640115454c..7a39a1a7261d 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -281,19 +281,19 @@ static void print_aggr_id_json(struct perf_stat_config *config,
>
>         switch (config->aggr_mode) {
>         case AGGR_CORE:
> -               fprintf(output, "\"core\" : \"S%d-D%d-C%d\", \"aggregate-number\" : %d, ",
> +               fprintf(output, "\"core\" : \"S%d-D%d-C%d\", \"cpu-count\" : %d, ",
>                         id.socket, id.die, id.core, nr);
>                 break;
>         case AGGR_DIE:
> -               fprintf(output, "\"die\" : \"S%d-D%d\", \"aggregate-number\" : %d, ",
> +               fprintf(output, "\"die\" : \"S%d-D%d\", \"cpu-count\" : %d, ",
>                         id.socket, id.die, nr);
>                 break;
>         case AGGR_SOCKET:
> -               fprintf(output, "\"socket\" : \"S%d\", \"aggregate-number\" : %d, ",
> +               fprintf(output, "\"socket\" : \"S%d\", \"cpu-count\" : %d, ",
>                         id.socket, nr);
>                 break;
>         case AGGR_NODE:
> -               fprintf(output, "\"node\" : \"N%d\", \"aggregate-number\" : %d, ",
> +               fprintf(output, "\"node\" : \"N%d\", \"cpu-count\" : %d, ",
>                         id.node, nr);
>                 break;
>         case AGGR_NONE:
> --
> 2.38.1.584.g0f3c55d4c2-goog
>