[PATCH 6.1 349/473] perf stat: Dont display metric header for non-leader uncore events

Greg Kroah-Hartman
2024-06-06T14:17:42Z

From: Ian Rogers <irogers@google.com>

[ Upstream commit 193a9e30207f54777ff42d0d8be8389edc522277 ]

On an Intel tigerlake laptop a metric like:

{
"BriefDescription": "Test",
"MetricExpr": "imc_free_running@data_read@ + imc_free_running@data_write@",
"MetricGroup": "Test",
"MetricName": "Test",
"ScaleUnit": "6.103515625e-5MiB"
},

Will have 4 events:

uncore_imc_free_running_0/data_read/
uncore_imc_free_running_0/data_write/
uncore_imc_free_running_1/data_read/
uncore_imc_free_running_1/data_write/

If aggregration is disabled with metric-only 2 column headers are
needed:

$ perf stat -M test --metric-only -A -a sleep 1

Performance counter stats for 'system wide':

MiB Test MiB Test
CPU0 1821.0 1820.5

But when not, the counts aggregated in the metric leader and only 1
column should be shown:

$ perf stat -M test --metric-only -a sleep 1
Performance counter stats for 'system wide':

MiB Test
5909.4

1.001258915 seconds time elapsed

Achieve this by skipping events that aren't metric leaders when
printing column headers and aggregation isn't disabled.

The bug is long standing, the fixes tag is set to a refactor as that
is as far back as is reasonable to backport.

Fixes: 088519f318be3a41 ("perf stat: Move the display functions to stat-display.c")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaige Ye <ye@kaige.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20240510051309.2452468-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/perf/util/stat-display.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index ef9a3df459657..9053db0dc00a1 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -1162,6 +1162,9 @@ static void print_metric_headers(struct perf_stat_config *config,

/* Print metrics headers only */
evlist__for_each_entry(evlist, counter) {
+ if (config->aggr_mode != AGGR_NONE && counter->metric_leader != counter)
+ continue;
+
os.evsel = counter;

if (!first && config->json_output)
--
2.43.0