linux-kernel - [PATCH v1 13/22] perf stat: Fix default metricgroup display on hybrid

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Message-ID: <20251024175857.808401-14-irogers@google.com>
Date: Fri, 24 Oct 2025 10:58:48 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@...aro.org>, Xu Yang <xu.yang_2@....com>, 
	Chun-Tse Shao <ctshao@...gle.com>, Thomas Richter <tmricht@...ux.ibm.com>, 
	Sumanth Korikkar <sumanthk@...ux.ibm.com>, Collin Funk <collin.funk1@...il.com>, 
	Thomas Falcon <thomas.falcon@...el.com>, Howard Chu <howardchu95@...il.com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>, Levi Yun <yeoreum.yun@....com>, 
	Yang Li <yang.lee@...ux.alibaba.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v1 13/22] perf stat: Fix default metricgroup display on hybrid

The logic to skip output of a default metric line was firing on
Alderlake and not displaying 'TopdownL1 (cpu_atom)'. Remove the
need_full_name check as it is equivalent to the different PMU test in
the cases we care about, merge the 'if's and flip the evsel of the PMU
test. The 'if' is now basically saying, if the output matches the last
printed output then skip the output.

Before:
```
             TopdownL1 (cpu_core)                 #     11.3 %  tma_bad_speculation
                                                  #     24.3 %  tma_frontend_bound
             TopdownL1 (cpu_core)                 #     33.9 %  tma_backend_bound
                                                  #     30.6 %  tma_retiring
                                                  #     42.2 %  tma_backend_bound
                                                  #     25.0 %  tma_frontend_bound       (49.81%)
                                                  #     12.8 %  tma_bad_speculation
                                                  #     20.0 %  tma_retiring             (59.46%)
```
After:
```
             TopdownL1 (cpu_core)                 #      8.3 %  tma_bad_speculation
                                                  #     43.7 %  tma_frontend_bound
                                                  #     30.7 %  tma_backend_bound
                                                  #     17.2 %  tma_retiring
             TopdownL1 (cpu_atom)                 #     31.9 %  tma_backend_bound
                                                  #     37.6 %  tma_frontend_bound       (49.66%)
                                                  #     18.0 %  tma_bad_speculation
                                                  #     12.6 %  tma_retiring             (59.58%)
```

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/stat-shadow.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index afbc49e8cb31..c1547128c396 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -256,11 +256,9 @@ static void perf_stat__print_metricgroup_header(struct perf_stat_config *config,
 	 * event. Only align with other metics from
 	 * different metric events.
 	 */
-	if (last_name && !strcmp(last_name, name)) {
-		if (!need_full_name || last_pmu != evsel->pmu) {
-			out->print_metricgroup_header(config, ctxp, NULL);
-			return;
-		}
+	if (last_name && !strcmp(last_name, name) && last_pmu == evsel->pmu) {
+		out->print_metricgroup_header(config, ctxp, NULL);
+		return;
 	}
 
 	if (need_full_name && evsel->pmu)
-- 
2.51.1.821.gb6fe4d2222-goog