linux-kernel - Re: [PATCH 10/18] perf metric: Collect referenced metrics in struct metric

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Date:   Tue, 14 Jul 2020 17:09:47 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 10/18] perf metric: Collect referenced metrics in struct metric_expr

On Sun, Jul 12, 2020 at 6:27 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Add referenced metrics into struct metric_expr object,
> so they are accessible when computing the metric.
>
> Storing just name and expression itself, so the metric
> can be resolved and computed.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

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

Thanks,
Ian

> ---
>  tools/perf/util/metricgroup.c | 26 ++++++++++++++++++++++++++
>  tools/perf/util/metricgroup.h |  6 ++++++
>  2 files changed, 32 insertions(+)
>
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 9923eef1e2d4..8cbcc5e05fef 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -83,6 +83,7 @@ static void metric_event_delete(struct rblist *rblist __maybe_unused,
>         struct metric_expr *expr, *tmp;
>
>         list_for_each_entry_safe(expr, tmp, &me->head, nd) {
> +               free(expr->metric_refs);
>                 free(expr);
>         }
>
> @@ -243,6 +244,7 @@ static int metricgroup__setup_events(struct list_head *groups,
>
>         list_for_each_entry (eg, groups, nd) {
>                 struct evsel **metric_events;
> +               struct metric_ref *metric_refs = NULL;
>
>                 metric_events = calloc(sizeof(void *),
>                                 hashmap__size(&eg->pctx.ids) + 1);
> @@ -274,6 +276,30 @@ static int metricgroup__setup_events(struct list_head *groups,
>                         free(metric_events);
>                         break;
>                 }
> +
> +               /*
> +                * Collect and store collected nested expressions
> +                * for metric processing.
> +                */
> +               if (eg->refs_cnt) {
> +                       struct metric_ref_node *ref;
> +
> +                       metric_refs = zalloc(sizeof(struct metric_ref) * (eg->refs_cnt + 1));
> +                       if (!metric_refs) {
> +                               ret = -ENOMEM;
> +                               free(metric_events);
> +                               break;
> +                       }
> +
> +                       i = 0;
> +                       list_for_each_entry(ref, &eg->refs, list) {
> +                               metric_refs[i].metric_name = ref->metric_name;
> +                               metric_refs[i].metric_expr = ref->metric_expr;
> +                               i++;
> +                       }
> +               };
> +
> +               expr->metric_refs = metric_refs;
>                 expr->metric_expr = eg->metric_expr;
>                 expr->metric_name = eg->metric_name;
>                 expr->metric_unit = eg->metric_unit;
> diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
> index 8315bd1a7da4..62623a39cbec 100644
> --- a/tools/perf/util/metricgroup.h
> +++ b/tools/perf/util/metricgroup.h
> @@ -18,12 +18,18 @@ struct metric_event {
>         struct list_head head; /* list of metric_expr */
>  };
>
> +struct metric_ref {
> +       const char *metric_name;
> +       const char *metric_expr;
> +};
> +
>  struct metric_expr {
>         struct list_head nd;
>         const char *metric_expr;
>         const char *metric_name;
>         const char *metric_unit;
>         struct evsel **metric_events;
> +       struct metric_ref *metric_refs;
>         int runtime;
>  };
>
> --
> 2.25.4
>