5.15-stable review patch. If anyone has any objections, please let me know.
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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 5ed20e1e09aef..79384e8326c65 100644 --- a/tools/perf/util/stat-display.c +++ b/tools/perf/util/stat-display.c @@ -1000,6 +1000,9 @@ 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; out.ctx = &os; out.print_metric = print_metric_header;