linux-kernel - Re: [PATCH V4 1/5] perf metrics: Sort the Default metricgroup

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Message-ID: <CAP-5=fVDouD85kvKeq252Zv1dL9r5QgpZBsh7uX5fOP7OR_x0A@mail.gmail.com>
Date:   Thu, 15 Jun 2023 22:48:23 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     kan.liang@...ux.intel.com
Cc:     acme@...nel.org, mingo@...hat.com, peterz@...radead.org,
        namhyung@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, eranian@...gle.com, ahmad.yasin@...el.com
Subject: Re: [PATCH V4 1/5] perf metrics: Sort the Default metricgroup

On Thu, Jun 15, 2023 at 8:14 PM <kan.liang@...ux.intel.com> wrote:
>
> From: Kan Liang <kan.liang@...ux.intel.com>
>
> The new default mode will print the metrics as a metric group. The
> metrics from the same metric group must be adjacent to each other in the
> metric list. But the metric_list_cmp() sorts metrics by the number of
> events.
>
> Add a new sort for the Default metricgroup, which sorts by
> default_metricgroup_name and metric_name.
>
> Add is_default in the struct metric_event to indicate that it's from
> the Default metricgroup.
>
> Store the displayed metricgroup name of the Default metricgroup into
> the metric expr for output.
>
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>

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

Thanks,
Ian

> ---
>  tools/perf/util/metricgroup.c | 26 ++++++++++++++++++++++++++
>  tools/perf/util/metricgroup.h |  3 +++
>  2 files changed, 29 insertions(+)
>
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 8b19644ade7d..a6a5ed44a679 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -79,6 +79,7 @@ static struct rb_node *metric_event_new(struct rblist *rblist __maybe_unused,
>                 return NULL;
>         memcpy(me, entry, sizeof(struct metric_event));
>         me->evsel = ((struct metric_event *)entry)->evsel;
> +       me->is_default = false;
>         INIT_LIST_HEAD(&me->head);
>         return &me->nd;
>  }
> @@ -1160,6 +1161,25 @@ static int metric_list_cmp(void *priv __maybe_unused, const struct list_head *l,
>         return right_count - left_count;
>  }
>
> +/**
> + * default_metricgroup_cmp - Implements complex key for the Default metricgroup

nit: what is the meaning of complex key here?

> + *                          that first sorts by default_metricgroup_name, then
> + *                          metric_name.
> + */
> +static int default_metricgroup_cmp(void *priv __maybe_unused,
> +                                  const struct list_head *l,
> +                                  const struct list_head *r)
> +{
> +       const struct metric *left = container_of(l, struct metric, nd);
> +       const struct metric *right = container_of(r, struct metric, nd);
> +       int diff = strcmp(right->default_metricgroup_name, left->default_metricgroup_name);
> +
> +       if (diff)
> +               return diff;
> +
> +       return strcmp(right->metric_name, left->metric_name);
> +}
> +
>  struct metricgroup__add_metric_data {
>         struct list_head *list;
>         const char *pmu;
> @@ -1515,6 +1535,7 @@ static int parse_groups(struct evlist *perf_evlist,
>         LIST_HEAD(metric_list);
>         struct metric *m;
>         bool tool_events[PERF_TOOL_MAX] = {false};
> +       bool is_default = !strcmp(str, "Default");
>         int ret;
>
>         if (metric_events_list->nr_entries == 0)
> @@ -1549,6 +1570,9 @@ static int parse_groups(struct evlist *perf_evlist,
>                         goto out;
>         }
>
> +       if (is_default)
> +               list_sort(NULL, &metric_list, default_metricgroup_cmp);
> +
>         list_for_each_entry(m, &metric_list, nd) {
>                 struct metric_event *me;
>                 struct evsel **metric_events;
> @@ -1637,6 +1661,8 @@ static int parse_groups(struct evlist *perf_evlist,
>                 expr->metric_unit = m->metric_unit;
>                 expr->metric_events = metric_events;
>                 expr->runtime = m->pctx->sctx.runtime;
> +               expr->default_metricgroup_name = m->default_metricgroup_name;
> +               me->is_default = is_default;
>                 list_add(&expr->nd, &me->head);
>         }
>
> diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
> index bf18274c15df..d5325c6ec8e1 100644
> --- a/tools/perf/util/metricgroup.h
> +++ b/tools/perf/util/metricgroup.h
> @@ -22,6 +22,7 @@ struct cgroup;
>  struct metric_event {
>         struct rb_node nd;
>         struct evsel *evsel;
> +       bool is_default; /* the metric evsel from the Default metricgroup */
>         struct list_head head; /* list of metric_expr */
>  };
>
> @@ -55,6 +56,8 @@ struct metric_expr {
>          * more human intelligible) and then add "MiB" afterward when displayed.
>          */
>         const char *metric_unit;
> +       /** Displayed metricgroup name of the Default metricgroup */
> +       const char *default_metricgroup_name;
>         /** Null terminated array of events used by the metric. */
>         struct evsel **metric_events;
>         /** Null terminated array of referenced metrics. */
> --
> 2.35.1
>