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Tue, 22 Sep 2026 17:26:10 -0700 (PDT) From: Donggeun Yoo To: sj@kernel.org, akpm@linux-foundation.org Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, donggeunyoo.kernel@gmail.com Subject: [PATCH v4 2/2] mm/damon/tests/core-kunit: test the temporal tuner's size quota conversion Date: Wed, 23 Sep 2026 09:25:59 +0900 Message-ID: <20260923002600.1825448-3-donggeunyoo.kernel@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260923002600.1825448-1-donggeunyoo.kernel@gmail.com> References: <20260923002600.1825448-1-donggeunyoo.kernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: kapxact1i14i49pmeub13riqu7t9fh6q X-Rspamd-Queue-Id: 610DE1C0009 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1790123172-662659 X-HE-Meta: U2FsdGVkX1+F3dWZdjhQDV9rmHjBJsYE29ZLEHs26DyXPwQZEj6t0gZ04UeFW5ELtJlqSgHxy8h6g1XXhdjHQ9EFz+s7wzEVRAhPo9rwt35pJ+8c7a9oveOoo3C/TI6N2FeczA0gyI1Yy51zEiLv1cLx3APSdnOZB1GsOKwFLESMVEqTzxxcAlXPxd6A6g5WSt1Hw1cGa+VbmuGgSKZezNFC1/5au0QuTVbqjz6AKtms4qZT51qqGD+D9U/q0HoL+QQZaAePk3kHhw5wjcWpDobLdbn8HoyLDkZTHl1l40unYa4+PgXi5Mjyom7kfvO10GuUfVhJ3/O7+spaAwrCm9qUs7WY/k0ft2cYGsSyyXSfRQGb6eCJzkHhgviiEr2VNUYEH2ji6VB3Z/GjBomIoVGad6u3MRlcjko68z+u+X8Om8vNgxtBB2/O1XEXZAlN0QEwCgyz22KSbkJffyXUZDUEAV05PysTmXguB3nptEtIq9bkL2HZN+KzAdc1iifSVa1G/NCmfYI/UrE3CSIJ/v1CopaiT8Fgho2OVg6sRX/HnbxwWgfO3Tncuenp9OEOs0ZSugdw9bMaYIfu8dBRSve9/VTMddthFLdg7ERjhrFUzaai2TMqXwEW0U4y0GvKicQ4WTM4KzPIcFwFsI+Ip82nZLgXh9o3o2JSuO9pQnULwWE/JAdbD96EqAvZ0eNbTqr9ulSX9vSXDPc+G5wipUbGakliD8hJ9uLSjpNYt2hooz3LxMB7lnoFT2V73wAX+DUbJ7BoQ5YdEeJPNdZ66doGwzPmnNlHX8kD/acipcorIRNemUyuUWJMu2F2LNf2mJlaHN3GmVY1h8OX0kOpkPY8Gbw8/jsqS8iFsdX0kRP00Yo8KxLhKlUf+tAlV99poc6z+fJv3OPu456F18AxOwepJMOMhubqyHbbRX558/fF9wPbmv7zoLHoc5kSa1JvZZGNZ1NfJUHUl7wH4iO Cpolv+Jp 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 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 Reviewed-by: SJ Park --- 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 df84d9cc7d204..bb20c6d01b692 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -2242,6 +2242,53 @@ 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), @@ -2281,6 +2328,7 @@ 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