linux-kernel - [PATCH v2 4/5] mm/damon/tests/core-kunit: add test cases for multiple regions in damon_test_split_regions

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Message-ID: <20251224042200.2061847-5-shu17az@gmail.com>
Date: Wed, 24 Dec 2025 04:21:59 +0000
From: Shu Anzai <shu17az@...il.com>
To: SeongJae Park <sj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Shu Anzai <shu17az@...il.com>
Subject: [PATCH v2 4/5] mm/damon/tests/core-kunit: add test cases for multiple regions in damon_test_split_regions_of()

Extend damon_test_split_regions_of() to verify that it correctly handles 
multiple regions with various 'min_sz_region'.

Signed-off-by: Shu Anzai <shu17az@...il.com>
---
 mm/damon/tests/core-kunit.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 2eb6f41635a8..36622a2c11f1 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -275,6 +275,9 @@ static void damon_test_split_regions_of(struct kunit *test)
 {
 	struct damon_target *t;
 	struct damon_region *r;
+	unsigned long sa[] = {0, 300, 500};
+	unsigned long ea[] = {220, 400, 700};
+	int i;
 
 	t = damon_new_target();
 	if (!t)
@@ -301,6 +304,24 @@ static void damon_test_split_regions_of(struct kunit *test)
 	damon_split_regions_of(t, 4, 1);
 	KUNIT_EXPECT_LE(test, damon_nr_regions(t), 4u);
 	damon_free_target(t);
+
+	t = damon_new_target();
+	if (!t)
+		kunit_skip(test, "third target alloc fail");
+	for (i = 0; i < ARRAY_SIZE(sa); i++) {
+		r = damon_new_region(sa[i], ea[i]);
+		if (!r) {
+			damon_free_target(t);
+			kunit_skip(test, "region alloc fail");
+		}
+		damon_add_region(r, t);
+	}
+	damon_split_regions_of(t, 4, 5);
+	KUNIT_EXPECT_LE(test, damon_nr_regions(t), 12u);
+	damon_for_each_region(r, t) {
+		KUNIT_EXPECT_GE(test, damon_sz_region(r) % 5ul, 0ul);
+	}
+	damon_free_target(t);
 }
 
 static void damon_test_ops_registration(struct kunit *test)
-- 
2.43.0