On Mon, 11 Sep 2023, Maxime Ripard <mrip...@kernel.org> wrote:
> 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 <mrip...@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);
Two thoughts:
Should there be some tolerance here? Otherwise we're flagging this on
the slowest machines, and we'll be defining tests slow based on
that. Like, warn if it takes more than 2 seconds.
What if someone makes a test faster, but forgets to update the
attribute? Should we also flag slow tests that are in fact fast?
BR,
Jani.
> }
>
> static void kunit_case_internal_cleanup(struct kunit *test)
--
Jani Nikula, Intel Open Source Graphics Center
