linux-kernel - Re: [PATCH] perf metric: Code cleanup with map_for_each

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Date:   Thu, 17 Sep 2020 14:19:37 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Wei Li <liwei391@...wei.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Li Bin <huawei.libin@...wei.com>, guohanjun@...wei.com
Subject: Re: [PATCH] perf metric: Code cleanup with map_for_each_event()

Hello,

On Thu, Sep 17, 2020 at 11:45 AM Wei Li <liwei391@...wei.com> wrote:
>
> Since we have introduced map_for_each_event() to walk the 'pmu_events_map',
> clean up metricgroup__print() and metricgroup__has_metric() with it.
>
> Signed-off-by: Wei Li <liwei391@...wei.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

A nit-pick below:


> ---
>  tools/perf/util/metricgroup.c | 33 +++++++++++++--------------------
>  1 file changed, 13 insertions(+), 20 deletions(-)
>
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 8831b964288f..3734cbb2c456 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -26,6 +26,17 @@
>  #include "util.h"
>  #include <asm/bug.h>
>
> +#define map_for_each_event(__pe, __idx, __map)                         \
> +       for (__idx = 0, __pe = &__map->table[__idx];                    \
> +            __pe->name || __pe->metric_group || __pe->metric_name;     \
> +            __pe = &__map->table[++__idx])
> +
> +#define map_for_each_metric(__pe, __idx, __map, __metric)              \
> +       map_for_each_event(__pe, __idx, __map)                          \
> +               if (__pe->metric_expr &&                                \
> +                   (match_metric(__pe->metric_group, __metric) ||      \
> +                    match_metric(__pe->metric_name, __metric)))
> +

You may consider adding a declaration of match_metric() here.
Right now, all users are below the function so it's ok but
having the macro here can enable future addition above IMHO.

Thanks
Namhyung


>  struct metric_event *metricgroup__lookup(struct rblist *metric_events,
>                                          struct evsel *evsel,
>                                          bool create)
> @@ -475,12 +486,9 @@ void metricgroup__print(bool metrics, bool metricgroups, char *filter,
>         groups.node_new = mep_new;
>         groups.node_cmp = mep_cmp;
>         groups.node_delete = mep_delete;
> -       for (i = 0; ; i++) {
> +       map_for_each_event(pe, i, map) {
>                 const char *g;
> -               pe = &map->table[i];
>
> -               if (!pe->name && !pe->metric_group && !pe->metric_name)
> -                       break;
>                 if (!pe->metric_expr)
>                         continue;
>                 g = pe->metric_group;
> @@ -745,17 +753,6 @@ static int __add_metric(struct list_head *metric_list,
>         return 0;
>  }
>
> -#define map_for_each_event(__pe, __idx, __map)                         \
> -       for (__idx = 0, __pe = &__map->table[__idx];                    \
> -            __pe->name || __pe->metric_group || __pe->metric_name;     \
> -            __pe = &__map->table[++__idx])
> -
> -#define map_for_each_metric(__pe, __idx, __map, __metric)              \
> -       map_for_each_event(__pe, __idx, __map)                          \
> -               if (__pe->metric_expr &&                                \
> -                   (match_metric(__pe->metric_group, __metric) ||      \
> -                    match_metric(__pe->metric_name, __metric)))
> -
>  static struct pmu_event *find_metric(const char *metric, struct pmu_events_map *map)
>  {
>         struct pmu_event *pe;
> @@ -1092,11 +1089,7 @@ bool metricgroup__has_metric(const char *metric)
>         if (!map)
>                 return false;
>
> -       for (i = 0; ; i++) {
> -               pe = &map->table[i];
> -
> -               if (!pe->name && !pe->metric_group && !pe->metric_name)
> -                       break;
> +       map_for_each_event(pe, i, map) {
>                 if (!pe->metric_expr)
>                         continue;
>                 if (match_metric(pe->metric_name, metric))
> --
> 2.17.1
>