linux-kernel - [PATCH 2/2] mm/damon/core-test: test damon_split_region

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Date:   Sun, 19 Nov 2023 17:15:29 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     SeongJae Park <sj@...nel.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        David Gow <davidgow@...gle.com>, damon@...ts.linux.dev,
        linux-mm@...ck.org, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] mm/damon/core-test: test damon_split_region_at()'s access rate copying

damon_split_region_at() should set access rate related fields of the
resulting regions same.  It may forgotten, and actually there was the
mistake before.  Test it with the unit test case for the function.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/core-test.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h
index 649adf91ebc5..e6a01ea2ec54 100644
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -122,18 +122,25 @@ static void damon_test_split_at(struct kunit *test)
 {
 	struct damon_ctx *c = damon_new_ctx();
 	struct damon_target *t;
-	struct damon_region *r;
+	struct damon_region *r, *r_new;
 
 	t = damon_new_target();
 	r = damon_new_region(0, 100);
+	r->nr_accesses_bp = 420000;
+	r->nr_accesses = 42;
+	r->last_nr_accesses = 15;
 	damon_add_region(r, t);
 	damon_split_region_at(t, r, 25);
 	KUNIT_EXPECT_EQ(test, r->ar.start, 0ul);
 	KUNIT_EXPECT_EQ(test, r->ar.end, 25ul);
 
-	r = damon_next_region(r);
-	KUNIT_EXPECT_EQ(test, r->ar.start, 25ul);
-	KUNIT_EXPECT_EQ(test, r->ar.end, 100ul);
+	r_new = damon_next_region(r);
+	KUNIT_EXPECT_EQ(test, r_new->ar.start, 25ul);
+	KUNIT_EXPECT_EQ(test, r_new->ar.end, 100ul);
+
+	KUNIT_EXPECT_EQ(test, r->nr_accesses_bp, r_new->nr_accesses_bp);
+	KUNIT_EXPECT_EQ(test, r->nr_accesses, r_new->nr_accesses);
+	KUNIT_EXPECT_EQ(test, r->last_nr_accesses, r_new->last_nr_accesses);
 
 	damon_free_target(t);
 	damon_destroy_ctx(c);
-- 
2.34.1