[v1] perf stat: Update event skip condition

[PATCH] perf stat: Update event skip condition

Posted by Namhyung Kim 2 years, 9 months ago

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@linux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.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;
 
 	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

Re: [PATCH] perf stat: Update event skip condition

Posted by Athira Rajeev 2 years, 9 months ago


> On 06-Dec-2022, at 4:46 AM, Namhyung Kim <namhyung@kernel.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@linux.vnet.ibm.com>
> Signed-off-by: Namhyung Kim <namhyung@kernel.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, 

Acked-by: Athira Rajeev <atrajeev@linux.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
>

Re: [PATCH] perf stat: Update event skip condition

Posted by Arnaldo Carvalho de Melo 2 years, 9 months ago

Em Tue, Dec 06, 2022 at 07:45:29PM +0530, Athira Rajeev escreveu:
> 
> 
> > On 06-Dec-2022, at 4:46 AM, Namhyung Kim <namhyung@kernel.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@linux.vnet.ibm.com>
> > Signed-off-by: Namhyung Kim <namhyung@kernel.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@linux.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