linux-kernel - [PATCH v1] perf test workload: Add thread count argument to thloop

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Message-ID: <20251027201405.3715599-1-irogers@google.com>
Date: Mon, 27 Oct 2025 13:14:05 -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>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] perf test workload: Add thread count argument to thloop

Allow the number of threads for the thloop workload to be increased
beyond the normal 2. Add error checking to the parsed time and thread
count values.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/workloads/thloop.c | 41 ++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 6 deletions(-)

diff --git a/tools/perf/tests/workloads/thloop.c b/tools/perf/tests/workloads/thloop.c
index 457b29f91c3e..dbb88bcf49e0 100644
--- a/tools/perf/tests/workloads/thloop.c
+++ b/tools/perf/tests/workloads/thloop.c
@@ -31,21 +31,50 @@ static void *thfunc(void *arg)
 
 static int thloop(int argc, const char **argv)
 {
-	int sec = 1;
-	pthread_t th;
+	int nt = 2, sec = 1, err = 1;
+	pthread_t *thread_list = NULL;
 
 	if (argc > 0)
 		sec = atoi(argv[0]);
 
+	if (sec <= 0) {
+		fprintf(stderr, "Error: seconds (%d) must be >= 1\n", sec);
+		return 1;
+	}
+
+	if (argc > 1)
+		nt = atoi(argv[1]);
+
+	if (nt <= 0) {
+		fprintf(stderr, "Error: thread count (%d) must be >= 1\n", nt);
+		return 1;
+	}
+
 	signal(SIGINT, sighandler);
 	signal(SIGALRM, sighandler);
-	alarm(sec);
 
-	pthread_create(&th, NULL, thfunc, test_loop);
+	thread_list = calloc(nt, sizeof(pthread_t));
+	if (thread_list == NULL) {
+		fprintf(stderr, "Error: malloc failed for %d threads\n", nt);
+		goto out;
+	}
+	for (int i = 1; i < nt; i++) {
+		int ret = pthread_create(&thread_list[i], NULL, thfunc, test_loop);
+
+		if (ret) {
+			fprintf(stderr, "Error: failed to create thread %d\n", i);
+			goto out;
+		}
+	}
+	alarm(sec);
 	test_loop();
-	pthread_join(th, NULL);
+	for (int i = 1; i < nt; i++)
+		pthread_join(thread_list[i], /*retval=*/NULL);
 
-	return 0;
+	err = 0;
+out:
+	free(thread_list);
+	return err;
 }
 
 DEFINE_WORKLOAD(thloop);
-- 
2.51.1.851.g4ebd6896fd-goog