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b=HJrhdGvj3mMyAr45edesRy1s4UQtEBtCTDY+FxTtS3/BZvgzvKbVfPO5j7rbT2ttW 6RBc88u+FgIP9uty5oDQoJC1WMR4oyCLPqhS08snJ6mLTyVg67Bep2DImBhgT+7NXa Gaz0ER4ZTKIEfDsMa4ZgF+1+pbV57yMYo8ow8/bu0EsCHPUepKy37hwW+50u00Z6TX k3KsVyVtO1yVrZgh+91FXpEFG1uVYN5lVRgP4tz37xE3inWOeaKL27mERGckxogk9d xzG7e3wR3SErovAc2l/MKG0PXiyfUTPXTX3LEFV2PSJeTWO5/Gza9dl6YpQ2yjOZZV QG8npMF+HiDRg== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , Brendan Higgins , David Gow , damon@lists.linux.dev, kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.3 03/11] mm/damon/tests/core-kunit: test damon_rand() Date: Thu, 25 Jun 2026 17:16:34 -0700 Message-ID: <20260626001644.85825-4-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260626001644.85825-1-sj@kernel.org> References: <20260626001644.85825-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 8DEDA140002 X-Rspam-User: X-Stat-Signature: 7k136k1ykf3upj7otmoxyjtp7pnekwsk X-HE-Tag: 1782433024-327324 X-HE-Meta: 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 VuBa8Jsd Rg5rUmWyy3BizjY6r9GyH2BuH1o0x9dvmDU0C/qCkGDo14ZsnCGY0WylVclmWGW7RSmfX8cG4Ujc0mACP+V2vcHr7U6N3nzLpr+BjFJP0kJdqizt3dZK6H0r+e/fpz1noE+Q4ljAVp2py8/rgFGxS+DMI2wiptpH4mai8xAl+20OsUtkRCjjGA1NgMzGoCUQPkS7ML/XZgSOXpaWvFsXn+6eP3LWkvHyyE/qYZ8wfllD+wVsBVK/jdFBhIS/C8hXhOfdjWi6P338FtNmO5z/H2A8s4g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Commit 9012c4e647df ("mm/damon: replace damon_rand() with a per-ctx lockless PRNG") optimized DAMON for better performance. Add a kunit test for ensuring the bounds of the output. Signed-off-by: SeongJae Park --- mm/damon/tests/core-kunit.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index 1cfb8c176b873..282670b0fa908 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -1460,6 +1460,20 @@ static void damon_test_is_last_region(struct kunit *test) damon_free_target(t); } +static void damon_test_rand(struct kunit *test) +{ + struct damon_ctx ctx; + int i; + + prandom_seed_state(&ctx.rnd_state, get_random_u64()); + for (i = 0; i < 10000; i++) { + unsigned long rnd = damon_rand(&ctx, 0, 10); + + KUNIT_EXPECT_GE(test, rnd, 0); + KUNIT_EXPECT_LE(test, rnd, 9); + } +} + static struct kunit_case damon_test_cases[] = { KUNIT_CASE(damon_test_target), KUNIT_CASE(damon_test_regions), @@ -1489,6 +1503,7 @@ static struct kunit_case damon_test_cases[] = { KUNIT_CASE(damon_test_set_filters_default_reject), KUNIT_CASE(damon_test_apply_min_nr_regions), KUNIT_CASE(damon_test_is_last_region), + KUNIT_CASE(damon_test_rand), {}, }; -- 2.47.3