linux-kernel - [PATCH v1 1/4] perf stat: Allow no events to open if this is a "--null" run

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Message-ID: <20251201230904.290733-1-irogers@google.com>
Date: Mon,  1 Dec 2025 15:09:01 -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>, 
	James Clark <james.clark@...aro.org>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/4] perf stat: Allow no events to open if this is a
 "--null" run

It is intended that a "--null" run doesn't open any events.

Fixes: 2cc7aa995ce9 ("perf stat: Refactor retry/skip/fatal error handling")
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-stat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 5c06e9b61821..6410115ed9c5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -923,7 +923,7 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 			goto err_out;
 		}
 	}
-	if (!has_supported_counters) {
+	if (!has_supported_counters && !stat_config.null_run) {
 		evsel__open_strerror(evlist__first(evsel_list), &target, open_err,
 				     msg, sizeof(msg));
 		ui__error("No supported events found.\n%s\n", msg);
-- 
2.52.0.158.g65b55ccf14-goog