linux-kernel - Re: [PATCH 05/19] perf metric: Add macros for iterating map events

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Date:   Sun, 26 Jul 2020 14:47:37 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     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>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH 05/19] perf metric: Add macros for iterating map events



On 7/19/20 11:43 PM, Jiri Olsa wrote:
> Adding following macros to iterate events and metric:
>   map_for_each_event(__pe, __idx, __map)
>     - iterates over all pmu_events_map events
>   map_for_each_metric(__pe, __idx, __map, __metric)
>     - iterates over all metrics that match __metric argument
> 
> and use it in metricgroup__add_metric function. Macros
> will be be used from other places in following changes.
> 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Reviewed-By : Kajol Jain<kjain@...ux.ibm.com>

Thanks,
Kajol Jain

> ---
>  tools/perf/util/metricgroup.c | 77 ++++++++++++++++++-----------------
>  1 file changed, 40 insertions(+), 37 deletions(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index df0356ec120d..b37008fc253c 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -614,6 +614,17 @@ static int __metricgroup__add_metric(struct list_head *group_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 int metricgroup__add_metric(const char *metric, bool metric_no_group,
>  				   struct strbuf *events,
>  				   struct list_head *group_list,
> @@ -624,49 +635,41 @@ static int metricgroup__add_metric(const char *metric, bool metric_no_group,
>  	int i, ret;
>  	bool has_match = false;
>  
> -	for (i = 0; ; i++) {
> -		pe = &map->table[i];
> -
> -		if (!pe->name && !pe->metric_group && !pe->metric_name) {
> -			/* End of pmu events. */
> -			if (!has_match)
> -				return -EINVAL;
> -			break;
> -		}
> -		if (!pe->metric_expr)
> -			continue;
> -		if (match_metric(pe->metric_group, metric) ||
> -		    match_metric(pe->metric_name, metric)) {
> -			has_match = true;
> -			pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
> -
> -			if (!strstr(pe->metric_expr, "?")) {
> -				ret = __metricgroup__add_metric(group_list,
> -								pe,
> -								metric_no_group,
> -								1);
> -				if (ret)
> -					return ret;
> -			} else {
> -				int j, count;
> +	map_for_each_metric(pe, i, map, metric) {
> +		pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
> +		has_match = true;
> +
> +		if (!strstr(pe->metric_expr, "?")) {
> +			ret = __metricgroup__add_metric(group_list,
> +							pe,
> +							metric_no_group,
> +							1);
> +			if (ret)
> +				return ret;
> +		} else {
> +			int j, count;
>  
> -				count = arch_get_runtimeparam();
> +			count = arch_get_runtimeparam();
>  
> -				/* This loop is added to create multiple
> -				 * events depend on count value and add
> -				 * those events to group_list.
> -				 */
> +			/* This loop is added to create multiple
> +			 * events depend on count value and add
> +			 * those events to group_list.
> +			 */
>  
> -				for (j = 0; j < count; j++) {
> -					ret = __metricgroup__add_metric(
> -						group_list, pe,
> -						metric_no_group, j);
> -					if (ret)
> -						return ret;
> -				}
> +			for (j = 0; j < count; j++) {
> +				ret = __metricgroup__add_metric(
> +					group_list, pe,
> +					metric_no_group, j);
> +				if (ret)
> +					return ret;
>  			}
>  		}
>  	}
> +
> +	/* End of pmu events. */
> +	if (!has_match)
> +		return -EINVAL;
> +
>  	list_for_each_entry(eg, group_list, nd) {
>  		if (events->len > 0)
>  			strbuf_addf(events, ",");
>