[PATCH 1/2] kunit: Warn if tests are slow

[Maxime Ripard <mripard@kernel.org>]

Kunit recently gained support to setup attributes, the first one being
the speed of a given test, then allowing to filter out slow tests.

A slow test is defined in the documentation as taking more than one
second. There's an another speed attribute called "super slow" but whose
definition is less clear.

Add support to the test runner to check the test execution time, and
report tests that should be marked as slow but aren't.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 lib/kunit/test.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 49698a168437..a3b924501f3d 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -379,6 +379,9 @@ static void kunit_run_case_internal(struct kunit *test,
 				    struct kunit_suite *suite,
 				    struct kunit_case *test_case)
 {
+	struct timespec64 start, end;
+	struct timespec64 duration;
+
 	if (suite->init) {
 		int ret;
 
@@ -390,7 +393,20 @@ static void kunit_run_case_internal(struct kunit *test,
 		}
 	}
 
+	ktime_get_ts64(&start);
+
 	test_case->run_case(test);
+
+	ktime_get_ts64(&end);
+
+	duration = timespec64_sub(end, start);
+
+	if (duration.tv_sec >= 1 &&
+	    (test_case->attr.speed == KUNIT_SPEED_UNSET ||
+	     test_case->attr.speed >= KUNIT_SPEED_NORMAL))
+		kunit_warn(test,
+			   "Test should be marked slow (runtime: %lld.%09lds)",
+			   duration.tv_sec, duration.tv_nsec);
 }
 
 static void kunit_case_internal_cleanup(struct kunit *test)

-- 
2.41.0