linux-kernel - Re: [PATCH v2] perf stat: Update event skip condition

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Date:   Wed, 7 Dec 2022 14:37:53 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        James Clark <james.clark@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>
Subject: Re: [PATCH v2] perf stat: Update event skip condition

Em Tue, Dec 06, 2022 at 09:58:04AM -0800, Namhyung Kim escreveu:
> In print_counter_aggrdata(), it skips some events that has no aggregate
> count.  It's actually for system-wide per-thread mode and merged uncore
> and hybrid events.
> 
> Let's update the condition to check them explicitly.

Thanks, applied.

- Arnaldo

 
> Fixes: 91f85f98da7a ("Display event stats using aggr counts")
> Reported-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> Acked-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/stat-display.c | 19 +++++++++----------
>  1 file changed, 9 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index 847acdb5dc40..a45aacc9df64 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -814,7 +814,8 @@ static void print_counter_aggrdata(struct perf_stat_config *config,
>  	os->nr = aggr->nr;
>  	os->evsel = counter;
>  
> -	if (counter->supported && aggr->nr == 0)
> +	/* Skip already merged uncore/hybrid events */
> +	if (counter->merged_stat)
>  		return;
>  
>  	uniquify_counter(config, counter);
> @@ -823,6 +824,13 @@ static void print_counter_aggrdata(struct perf_stat_config *config,
>  	ena = aggr->counts.ena;
>  	run = aggr->counts.run;
>  
> +	/*
> +	 * Skip value 0 when enabling --per-thread globally, otherwise it will
> +	 * have too many 0 output.
> +	 */
> +	if (val == 0 && config->aggr_mode == AGGR_THREAD && config->system_wide)
> +		return;
> +
>  	if (!metric_only) {
>  		if (config->json_output)
>  			fputc('{', output);
> @@ -899,9 +907,6 @@ static void print_aggr(struct perf_stat_config *config,
>  		print_metric_begin(config, evlist, os, s);
>  
>  		evlist__for_each_entry(evlist, counter) {
> -			if (counter->merged_stat)
> -				continue;
> -
>  			print_counter_aggrdata(config, counter, s, os);
>  		}
>  		print_metric_end(config, os);
> @@ -928,9 +933,6 @@ static void print_aggr_cgroup(struct perf_stat_config *config,
>  			print_metric_begin(config, evlist, os, s);
>  
>  			evlist__for_each_entry(evlist, counter) {
> -				if (counter->merged_stat)
> -					continue;
> -
>  				if (counter->cgrp != os->cgrp)
>  					continue;
>  
> @@ -950,9 +952,6 @@ static void print_counter(struct perf_stat_config *config,
>  	if (!config->aggr_map)
>  		return;
>  
> -	if (counter->merged_stat)
> -		return;
> -
>  	for (s = 0; s < config->aggr_map->nr; s++) {
>  		print_counter_aggrdata(config, counter, s, os);
>  	}
> -- 
> 2.39.0.rc0.267.gcb52ba06e7-goog

-- 

- Arnaldo