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

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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: SeongJae 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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2023-11-30 02:36:48 +00:00 committed by Andrew Morton
parent d91beaa505
commit f1762cb3ea
1 changed files with 32 additions and 0 deletions
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32
mm/damon/core-test.h
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@ -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),
{},
};