linux-kernel - [PATCH v2 4/4] perf stat: Display metric-only for 0 counters

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Message-ID: <20251112195311.1673981-5-irogers@google.com>
Date: Wed, 12 Nov 2025 11:53:11 -0800
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>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Chun-Tse Shao <ctshao@...gle.com>, Thomas Falcon <thomas.falcon@...el.com>, 
	Yang Li <yang.lee@...ux.alibaba.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] perf stat: Display metric-only for 0 counters

0 counters may occur in hypervisor settings but metric-only output is
always expected. This resolves an issue in the "perf stat STD output
linter" test.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 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 5ac9854f8c58..6d02f84c5691 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -913,6 +913,9 @@ static bool should_skip_zero_counter(struct perf_stat_config *config,
 	if (verbose == 0 && counter->skippable && !counter->supported)
 		return true;
 
+	/* Metric only counts won't be displayed but the metric wants to be computed. */
+	if (config->metric_only)
+		return false;
 	/*
 	 * Skip value 0 when enabling --per-thread globally,
 	 * otherwise it will have too many 0 output.
-- 
2.51.2.1041.gc1ab5b90ca-goog