Commit f1762cb3 authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

mm/damon/core-test: add a unit test for the feedback loop algorithm 

Implement a simple kunit test for testing the behavior of the feedback
loop algorithm for the aim-oriented feedback-friven DAMOS aggressiveness
auto tuning.

Link: https://lkml.kernel.org/r/20231130023652.50284-6-sj@kernel.org


Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent d91beaa5

mm/damon/core-test.h

+32 −0
Original line number Diff line number Diff line
@@ -446,6 +446,37 @@ static void damos_test_filter_out(struct kunit *test) 
	damos_free_filter(f);

}



static void damon_test_feed_loop_next_input(struct kunit *test)

{

	unsigned long last_input = 900000, current_score = 200;



	/*

	 * If current score is lower than the goal, which is always 10,000

	 * (read the comment on damon_feed_loop_next_input()'s comment), next

	 * input should be higher than the last input.

	 */

	KUNIT_EXPECT_GT(test,

			damon_feed_loop_next_input(last_input, current_score),

			last_input);



	/*

	 * If current score is higher than the goal, next input should be lower

	 * than the last input.

	 */

	current_score = 250000000;

	KUNIT_EXPECT_LT(test,

			damon_feed_loop_next_input(last_input, current_score),

			last_input);



	/*

	 * The next input depends on the distance between the current score and

	 * the goal

	 */

	KUNIT_EXPECT_GT(test,

			damon_feed_loop_next_input(last_input, 200),

			damon_feed_loop_next_input(last_input, 2000));

}



static struct kunit_case damon_test_cases[] = {

	KUNIT_CASE(damon_test_target),

	KUNIT_CASE(damon_test_regions),
@@ -461,6 +492,7 @@ static struct kunit_case damon_test_cases[] = { 
	KUNIT_CASE(damon_test_moving_sum),

	KUNIT_CASE(damos_test_new_filter),

	KUNIT_CASE(damos_test_filter_out),

	KUNIT_CASE(damon_test_feed_loop_next_input),

	{},

};