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Sat, 19 Sep 2026 19:31:21 -0700 (PDT) From: Donggeun Yoo To: SJ Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, donggeunyoo.kernel@gmail.com Subject: [PATCH v2 2/3] mm/damon/tests/core-kunit: test the temporal tuner's size quota conversion Date: Sun, 20 Sep 2026 11:31:10 +0900 Message-ID: <20260920023111.2466265-3-donggeunyoo.kernel@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260920023111.2466265-1-donggeunyoo.kernel@gmail.com> References: <20260920023111.2466265-1-donggeunyoo.kernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 8E43B40004 X-Stat-Signature: pgnioosyekcjuww9381pxdc8t6qbzjii X-Rspam-User: X-HE-Tag: 1789871483-951836 X-HE-Meta: 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 izwYre8M VrUvqLB4tNBqvQbfLD3oZz7SRO3vNGzDguBxLqHKcR4SwSyTmdH4UsKxycQpTBbvuIVASpa+Wp45wlPDZadVt/5xcn0socI9m4venZgCiPWK0VpWQd1GzYCRxx3N6uYqO2jCX7L+5vJ7FOulfKukfxH90gebaj8lUExN082koGGHOvGqvPAk6yC5AJq32R+ayigBj+fEaVTqrnuzCBVAkwNjsUby/uGmC1J2/7HIgVpLBFHQDa4QGOj3BJ/xNCLBOg1hnXXFyK83qtQI8sa5OTL1XxMndsklAakm7j469njBFWrKu0/mTmTd8BDM/UejdIA6ERoeeFOBLKI0DoBYt5zLnTCAepWfaEVYyUT3B/YqH+2KIJiLG37OECmKa+O6K5E3qYQiE+RQyWlFdJd3Sw76BDMhw5cRlPpw3o9eFhzXOj9Tu734/QZsib1ch7C3mMFNLpHX18mTFZWBgdNwg20/kIKljn1pqsyPH2nPYWq2exU0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: damos_goal_tune_esz_bp_temporal() encodes the size quota in basis points, so the conversion is exact only up to ULONG_MAX / 10000. Pin the three sizes around that boundary: the largest one that fits, the first one that does not, and ULONG_MAX. Signed-off-by: Donggeun Yoo --- mm/damon/tests/core-kunit.h | 48 +++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index 5ff0436c58441..a0604788bc638 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -1929,6 +1929,53 @@ static void damon_test_rand(struct kunit *test) } } +static void damos_test_esz_goal_temporal(struct kunit *test) +{ + struct damos_access_pattern pattern = {}; + struct damos_watermarks wmarks = {}; + struct damos_quota quota = { + .goal_tuner = DAMOS_QUOTA_GOAL_TUNER_TEMPORAL, + }; + struct damos_quota_goal *goal; + struct damon_ctx *ctx; + struct damos *s; + + ctx = damon_new_ctx(); + KUNIT_ASSERT_NOT_NULL(test, ctx); + + s = damon_new_scheme(&pattern, DAMOS_STAT, 0, "a, &wmarks, + NUMA_NO_NODE); + if (!s) { + damon_destroy_ctx(ctx); + kunit_skip(test, "scheme alloc fail"); + } + damon_add_scheme(ctx, s); + + goal = damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000); + if (!goal) { + damon_destroy_ctx(ctx); + kunit_skip(test, "quota goal alloc fail"); + } + goal->current_value = 0; + damos_add_quota_goal(&s->quota, goal); + + /* The largest size quota the basis-point conversion can hold. */ + s->quota.sz = ULONG_MAX / 10000; + damos_set_effective_quota(ctx, s); + KUNIT_EXPECT_EQ(test, s->quota.esz, ULONG_MAX / 10000); + + /* Any larger one saturates instead of wrapping. */ + s->quota.sz = ULONG_MAX / 10000 + 1; + damos_set_effective_quota(ctx, s); + KUNIT_EXPECT_EQ(test, s->quota.esz, ULONG_MAX / 10000); + + s->quota.sz = ULONG_MAX; + damos_set_effective_quota(ctx, s); + KUNIT_EXPECT_EQ(test, s->quota.esz, ULONG_MAX / 10000); + + damon_destroy_ctx(ctx); +} + static struct kunit_case damon_test_cases[] = { KUNIT_CASE(damon_test_target), KUNIT_CASE(damon_test_regions), @@ -1965,6 +2012,7 @@ static struct kunit_case damon_test_cases[] = { KUNIT_CASE(damon_test_is_last_region), KUNIT_CASE(damon_test_walk_control_obsolete), KUNIT_CASE(damon_test_rand), + KUNIT_CASE(damos_test_esz_goal_temporal), {}, }; -- 2.53.0