linux-kernel - Re: [PATCH v2] perf metric: Code cleanup with map_for_each

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Date:   Fri, 18 Sep 2020 15:57:21 +0200
From:   Jiri Olsa <jolsa@...hat.com>
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>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, huawei.libin@...wei.com,
        guohanjun@...wei.com
Subject: Re: [PATCH v2] perf metric: Code cleanup with map_for_each_event()

On Fri, Sep 18, 2020 at 09:29:48AM +0800, Wei Li 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>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
> v1 -> v2:
>  - Move map_for_each_metric() after match_metric() to avoid potential
>    use-before-declare.
> ---
>  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..50ee36437b99 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -374,6 +374,17 @@ static bool match_metric(const char *n, const char *list)
>  	return false;
>  }
>  
> +#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)))
> +
>  struct mep {
>  	struct rb_node nd;
>  	const char *name;
> @@ -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
>