From 579a3297b268f0281644ead7ff574a2b4bc64d3c Mon Sep 17 00:00:00 2001 From: Emil Tsalapatis Date: Fri, 5 Dec 2025 13:23:14 -0800 Subject: [PATCH] selftests/sched_ext: flush stdout before test to avoid log spam The sched_ext selftests runner runs each test in the same process, with each test possibly forking multiple times. When the main runner has not flushed its stdout, the children inherit the buffered output for previous tests and emit it during exit. This causes log spam. Make sure stdout/stderr is fully flushed before each test. Cc: Ihor Solodrai Signed-off-by: Emil Tsalapatis Signed-off-by: Tejun Heo --- tools/testing/selftests/sched_ext/runner.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/testing/selftests/sched_ext/runner.c b/tools/testing/selftests/sched_ext/runner.c index aa2d7d32dda9b..5748d2c699037 100644 --- a/tools/testing/selftests/sched_ext/runner.c +++ b/tools/testing/selftests/sched_ext/runner.c @@ -46,6 +46,14 @@ static void print_test_preamble(const struct scx_test *test, bool quiet) if (!quiet) printf("DESCRIPTION: %s\n", test->description); printf("OUTPUT:\n"); + + /* + * The tests may fork with the preamble buffered + * in the children's stdout. Flush before the test + * to avoid printing the message multiple times. + */ + fflush(stdout); + fflush(stderr); } static const char *status_to_result(enum scx_test_status status) -- 2.47.3