mm/damon/core-test: add a unit test for damon_moving_sum()

Add a simple unit test for the pseudo moving-sum function
(damon_moving_sum()).

Link: https://lkml.kernel.org/r/20230915025251.72816-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h
index 6cc8b24..c539f0e 100644 (file)
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -341,6 +341,21 @@ static void damon_test_set_attrs(struct kunit *test)
        KUNIT_EXPECT_EQ(test, damon_set_attrs(c, &invalid_attrs), -EINVAL);
 }
 
+static void damon_test_moving_sum(struct kunit *test)
+{
+       unsigned int mvsum = 50000, nomvsum = 50000, len_window = 10;
+       unsigned int new_values[] = {10000, 0, 10000, 0, 0, 0, 10000, 0, 0, 0};
+       unsigned int expects[] = {55000, 50000, 55000, 50000, 45000, 40000,
+               45000, 40000, 35000, 30000};
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(new_values); i++) {
+               mvsum = damon_moving_sum(mvsum, nomvsum, len_window,
+                               new_values[i]);
+               KUNIT_EXPECT_EQ(test, mvsum, expects[i]);
+       }
+}
+
 static void damos_test_new_filter(struct kunit *test)
 {
        struct damos_filter *filter;
@@ -425,6 +440,7 @@ static struct kunit_case damon_test_cases[] = {
        KUNIT_CASE(damon_test_set_regions),
        KUNIT_CASE(damon_test_update_monitoring_result),
        KUNIT_CASE(damon_test_set_attrs),
+       KUNIT_CASE(damon_test_moving_sum),
        KUNIT_CASE(damos_test_new_filter),
        KUNIT_CASE(damos_test_filter_out),
        {},