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

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Message-ID: <Y49oU5fJCNjAdh3S@kernel.org>
Date:   Tue, 6 Dec 2022 13:05:39 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, 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,
        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] perf stat: Update event skip condition

Em Tue, Dec 06, 2022 at 07:45:29PM +0530, Athira Rajeev escreveu:
> 
> 
> > On 06-Dec-2022, at 4:46 AM, Namhyung Kim <namhyung@...nel.org> wrote:
> > 
> > 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.
> > 
> > Fixes: 91f85f98da7a ("Display event stats using aggr counts")
> > Reported-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> > Athira, could you please check this fixes the problem?
> > 
> > tools/perf/util/stat-display.c | 16 +++++++++-------
> > 1 file changed, 9 insertions(+), 7 deletions(-)
> > 
> > diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> > index 847acdb5dc40..6c0de52ac4be 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;
> 
> Hi Namhyung,
> 
> Thanks for the fix.
> 
> This patch removes the merged_stat checks from print_aggr and print_aggr_cgroup.
> We also have this check in print_counter which needs to be removed.
> 
> With that change, 

Waiting for v2 then.

- Arnaldo
 
> Acked-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> 
> > 
> > 	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;
> > 
> > -- 
> > 2.39.0.rc0.267.gcb52ba06e7-goog
> > 

-- 

- Arnaldo