linux-kernel - [PATCH v2 3/5] mm/damon/tests/core-kunit: add a test case for region merge size limit in damon_test_merge_regions

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Message-ID: <20251224042200.2061847-4-shu17az@gmail.com>
Date: Wed, 24 Dec 2025 04:21:58 +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 3/5] mm/damon/tests/core-kunit: add a test case for region merge size limit in damon_test_merge_regions_of()

Add a test case in damon_test_merge_regions_of() to verify that 
two adjacent regions are not merged if the resulting region would 
exceed the specified size limit.

Signed-off-by: Shu Anzai <shu17az@...il.com>
---
 mm/damon/tests/core-kunit.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 6e301113e103..2eb6f41635a8 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -238,12 +238,12 @@ static void damon_test_merge_regions_of(struct kunit *test)
 {
 	struct damon_target *t;
 	struct damon_region *r;
-	unsigned long sa[] = {0, 100, 114, 122, 130, 156, 170, 184};
-	unsigned long ea[] = {100, 112, 122, 130, 156, 170, 184, 230};
-	unsigned int nrs[] = {0, 0, 10, 10, 20, 30, 1, 2};
+	unsigned long sa[] = {0, 100, 114, 122, 130, 156, 170, 184, 230};
+	unsigned long ea[] = {100, 112, 122, 130, 156, 170, 184, 230, 10170};
+	unsigned int nrs[] = {0, 0, 10, 10, 20, 30, 1, 2, 5};
 
-	unsigned long saddrs[] = {0, 114, 130, 156, 170};
-	unsigned long eaddrs[] = {112, 130, 156, 170, 230};
+	unsigned long saddrs[] = {0, 114, 130, 156, 170, 230};
+	unsigned long eaddrs[] = {112, 130, 156, 170, 230, 10170};
 	int i;
 
 	t = damon_new_target();
@@ -261,9 +261,9 @@ static void damon_test_merge_regions_of(struct kunit *test)
 	}
 
 	damon_merge_regions_of(t, 9, 9999);
-	/* 0-112, 114-130, 130-156, 156-170 */
-	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 5u);
-	for (i = 0; i < 5; i++) {
+	/* 0-112, 114-130, 130-156, 156-170, 170-230, 230-10170 */
+	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 6u);
+	for (i = 0; i < 6; i++) {
 		r = __nth_region_of(t, i);
 		KUNIT_EXPECT_EQ(test, r->ar.start, saddrs[i]);
 		KUNIT_EXPECT_EQ(test, r->ar.end, eaddrs[i]);
-- 
2.43.0