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Wed, 16 Sep 2026 17:36:06 -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 v1 2/2] mm/damon/tests/core-kunit: test the size charged for a filter-trimmed region Date: Thu, 17 Sep 2026 09:35:53 +0900 Message-ID: <20260917003553.2465523-3-donggeunyoo.kernel@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260917003553.2465523-1-donggeunyoo.kernel@gmail.com> References: <20260917003553.2465523-1-donggeunyoo.kernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 08ABF1A0003 X-Stat-Signature: hmb5q1ye8q3a6n1i5i1ui14wsp9awrur X-HE-Tag: 1789605367-468608 X-HE-Meta: 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 sWNSaOfF iexKPWmQ6zq6rMCwAsR5jiX2evYjz+HuGTQ/+jHoOL5kjQGwnit49xFPySUxrswbS2OqGEeHzUAHg9aEzwz1OIeu5PQnCy2xJdy/emrsD44Uwol5w5dR3NGziwA2b/cEvk3MELbtaELD+KO51bqH+usY/rHLlnoMJboogPfo/1OiYxYGNEP8Zit6u+M/T8m4exQulasEr6Ivs3uR1gShzr7JJbAH7VFffXbyJDKEtxqGu3g8DKV+a7eK3gqjn7CNRTkIfM/0RbCJnqgiCk6qRN9oNHAabj5+RSX+RxGkXYpDU16jOw5Mu4apZ2osSyawMA2sP7Zo6dZio1GLqSrVL6RY0Utz9KSgws6+vxmLT4pLRJ0Yfl1hupoNucPKTqu9xRN7SM7Bzou59uNE2UKLJN0frZlZjov38HMr0WYgMFnXlyl60ld4iL8UTI05IeLUSO2M9Po/5ZK5W3DCTTcamsifLMu/rdA48qr8nsQStKRIb1Jc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: damos_test_filter_out() checks that an address range filter splits a region at the filter boundary, and stops there. Nothing checks what damos_apply_scheme() then charges to the quota and reports as tried. damos_test_apply_scheme_filtered_sz() covers the two ways such a filter trims a region: one that starts before the filter's range, and one that starts inside it. damos_test_apply_scheme_filter_sz_unchanged() and damos_test_apply_scheme_quota_sz() cover the cases whose accounting must not change: a region wholly inside a reject range, one wholly inside an allow range, two filters trimming in a single call, a filter type that never splits, no filter at all, a region the quota trims, and a quota remainder too small for one region. Signed-off-by: Donggeun Yoo --- mm/damon/tests/core-kunit.h | 316 ++++++++++++++++++++++++++++++++++++ 1 file changed, 316 insertions(+) diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index 5da84caf4124..82c542afaa60 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -1676,6 +1676,319 @@ static void damos_test_filter_out(struct kunit *test) damos_free_filter(f); } +static unsigned long damos_test_apply_scheme_stub(struct damon_ctx *c, + struct damon_target *t, struct damon_region *r, + struct damos *s, unsigned long *sz_filter_passed) +{ + return 0; +} + +static void damos_test_apply_scheme_filtered_sz(struct kunit *test) +{ + struct damos_access_pattern pattern = { + .min_sz_region = 0, + .max_sz_region = ULONG_MAX, + .min_nr_accesses = 0, + .max_nr_accesses = UINT_MAX, + .min_age_region = 0, + .max_age_region = UINT_MAX, + }; + unsigned long min_sz = DAMON_MIN_REGION_SZ; + struct damos_watermarks wmarks = {}; + struct damos_quota quota = {}; + struct damon_ctx *c; + struct damon_target *t; + struct damon_region *r; + struct damos_filter *f; + struct damos *s; + + c = damon_new_ctx(); + if (!c) + kunit_skip(test, "ctx alloc fail"); + c->ops.apply_scheme = damos_test_apply_scheme_stub; + + s = damon_new_scheme(&pattern, DAMOS_STAT, 0, "a, &wmarks, + NUMA_NO_NODE); + if (!s) { + damon_destroy_ctx(c); + kunit_skip(test, "scheme alloc fail"); + } + damon_add_scheme(c, s); + + t = damon_new_target(); + if (!t) { + damon_destroy_ctx(c); + kunit_skip(test, "target alloc fail"); + } + damon_add_target(c, t); + + f = damos_new_filter(DAMOS_FILTER_TYPE_ADDR, true, false); + if (!f) { + damon_destroy_ctx(c); + kunit_skip(test, "filter alloc fail"); + } + f->addr_range = (struct damon_addr_range){ + .start = 2 * min_sz, + .end = 8 * min_sz + }; + damos_add_filter(s, f); + damos_set_filters_default_reject(s); + + /* reject filter, region starting before the range */ + r = damon_new_region(0, 4 * min_sz); + if (!r) { + damon_destroy_ctx(c); + kunit_skip(test, "region alloc fail"); + } + damon_add_region(r, t); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 2); + KUNIT_EXPECT_EQ(test, r->ar.end, 2 * min_sz); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 2 * min_sz); + + if (damon_nr_regions(t) != 2) + goto out; + damon_destroy_region(damon_next_region(r), t); + damon_destroy_region(r, t); + s->stat = (struct damos_stat){}; + + /* allow filter, region starting inside the range */ + f->allow = true; + damos_set_filters_default_reject(s); + r = damon_new_region(2 * min_sz, 10 * min_sz); + if (!r) { + damon_destroy_ctx(c); + kunit_skip(test, "region alloc fail"); + } + damon_add_region(r, t); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 2); + KUNIT_EXPECT_EQ(test, r->ar.end, 8 * min_sz); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 6 * min_sz); + +out: + damon_destroy_ctx(c); +} + +static void damos_test_apply_scheme_filter_sz_unchanged(struct kunit *test) +{ + struct damos_access_pattern pattern = { + .min_sz_region = 0, + .max_sz_region = ULONG_MAX, + .min_nr_accesses = 0, + .max_nr_accesses = UINT_MAX, + .min_age_region = 0, + .max_age_region = UINT_MAX, + }; + unsigned long min_sz = DAMON_MIN_REGION_SZ; + struct damos_watermarks wmarks = {}; + struct damos_quota quota = {}; + struct damos_filter *f, *f2; + struct damon_ctx *c; + struct damon_target *t; + struct damon_region *r; + struct damos *s; + + c = damon_new_ctx(); + if (!c) + kunit_skip(test, "ctx alloc fail"); + c->ops.apply_scheme = damos_test_apply_scheme_stub; + + s = damon_new_scheme(&pattern, DAMOS_STAT, 0, "a, &wmarks, + NUMA_NO_NODE); + if (!s) { + damon_destroy_ctx(c); + kunit_skip(test, "scheme alloc fail"); + } + damon_add_scheme(c, s); + + t = damon_new_target(); + if (!t) { + damon_destroy_ctx(c); + kunit_skip(test, "target alloc fail"); + } + damon_add_target(c, t); + + f = damos_new_filter(DAMOS_FILTER_TYPE_ADDR, true, false); + if (!f) { + damon_destroy_ctx(c); + kunit_skip(test, "filter alloc fail"); + } + f->addr_range = (struct damon_addr_range){ + .start = 2 * min_sz, .end = 8 * min_sz}; + damos_add_filter(s, f); + damos_set_filters_default_reject(s); + + /* wholly inside a reject range: not counted at all */ + r = damon_new_region(4 * min_sz, 6 * min_sz); + if (!r) { + damon_destroy_ctx(c); + kunit_skip(test, "region alloc fail"); + } + damon_add_region(r, t); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, s->stat.nr_tried, 0); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 0); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1); + + /* wholly inside an allow range: counted whole, not split */ + f->allow = true; + damos_set_filters_default_reject(s); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 2 * min_sz); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1); + + /* two filters, each trimming: the size left after both is counted */ + damon_destroy_region(r, t); + s->stat = (struct damos_stat){}; + f->allow = false; + f->addr_range = (struct damon_addr_range){ + .start = 4 * min_sz, .end = 12 * min_sz}; + f2 = damos_new_filter(DAMOS_FILTER_TYPE_ADDR, true, false); + if (!f2) { + damon_destroy_ctx(c); + kunit_skip(test, "filter alloc fail"); + } + f2->addr_range = (struct damon_addr_range){ + .start = 2 * min_sz, .end = 3 * min_sz}; + damos_add_filter(s, f2); + damos_set_filters_default_reject(s); + + r = damon_new_region(0, 8 * min_sz); + if (!r) { + damon_destroy_ctx(c); + kunit_skip(test, "region alloc fail"); + } + damon_add_region(r, t); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 3); + KUNIT_EXPECT_EQ(test, r->ar.end, 2 * min_sz); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 2 * min_sz); + + /* a core filter that never splits: counted whole */ + damos_destroy_filter(f2); + damos_destroy_filter(f); + f = damos_new_filter(DAMOS_FILTER_TYPE_TARGET, true, true); + if (!f) { + damon_destroy_ctx(c); + kunit_skip(test, "filter alloc fail"); + } + f->target_idx = 0; + damos_add_filter(s, f); + damos_set_filters_default_reject(s); + s->stat = (struct damos_stat){}; + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 3); + KUNIT_EXPECT_EQ(test, r->ar.end, 2 * min_sz); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 2 * min_sz); + + damon_destroy_ctx(c); +} + +static void damos_test_apply_scheme_quota_sz(struct kunit *test) +{ + struct damos_access_pattern pattern = { + .min_sz_region = 0, + .max_sz_region = ULONG_MAX, + .min_nr_accesses = 0, + .max_nr_accesses = UINT_MAX, + .min_age_region = 0, + .max_age_region = UINT_MAX, + }; + unsigned long min_sz = DAMON_MIN_REGION_SZ; + struct damos_watermarks wmarks = {}; + struct damos_quota quota = {}; + struct damon_region *r, *next; + struct damon_ctx *c; + struct damon_target *t; + struct damos *s; + + c = damon_new_ctx(); + if (!c) + kunit_skip(test, "ctx alloc fail"); + + s = damon_new_scheme(&pattern, DAMOS_STAT, 0, "a, &wmarks, + NUMA_NO_NODE); + if (!s) { + damon_destroy_ctx(c); + kunit_skip(test, "scheme alloc fail"); + } + damon_add_scheme(c, s); + damos_set_filters_default_reject(s); + + t = damon_new_target(); + if (!t) { + damon_destroy_ctx(c); + kunit_skip(test, "target alloc fail"); + } + damon_add_target(c, t); + + /* no apply_scheme operation: the whole region is counted */ + r = damon_new_region(0, 4 * min_sz); + if (!r) { + damon_destroy_ctx(c); + kunit_skip(test, "region alloc fail"); + } + damon_add_region(r, t); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 4 * min_sz); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1); + + /* no filter and no quota: the whole region is counted */ + c->ops.apply_scheme = damos_test_apply_scheme_stub; + s->stat = (struct damos_stat){}; + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 4 * min_sz); + KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1); + + /* the quota trims the region: the trimmed size is counted */ + damon_for_each_region_safe(r, next, t) + damon_destroy_region(r, t); + s->stat = (struct damos_stat){}; + s->quota.esz = 2 * min_sz; + s->quota.charged_sz = 0; + + r = damon_new_region(0, 8 * min_sz); + if (!r) { + damon_destroy_ctx(c); + kunit_skip(test, "region alloc fail"); + } + damon_add_region(r, t); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, r->ar.end, 2 * min_sz); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 2 * min_sz); + + /* quota remainder below one region: tried, but nothing counted */ + damon_for_each_region_safe(r, next, t) + damon_destroy_region(r, t); + s->stat = (struct damos_stat){}; + s->quota.esz = 1; + s->quota.charged_sz = 0; + + r = damon_new_region(0, 4 * min_sz); + if (!r) { + damon_destroy_ctx(c); + kunit_skip(test, "region alloc fail"); + } + damon_add_region(r, t); + + damos_apply_scheme(c, t, r, s); + KUNIT_EXPECT_EQ(test, s->stat.nr_tried, 1); + KUNIT_EXPECT_EQ(test, s->stat.sz_tried, 0); + KUNIT_EXPECT_EQ(test, r->ar.end, 4 * min_sz); + + damon_destroy_ctx(c); +} + static void damon_test_feed_loop_next_input(struct kunit *test) { unsigned long last_input = 900000, current_score = 200; @@ -1929,6 +2242,9 @@ static struct kunit_case damon_test_cases[] = { KUNIT_CASE(damon_test_commit_ctx), KUNIT_CASE(damon_test_valid_probe_params), KUNIT_CASE(damos_test_filter_out), + KUNIT_CASE(damos_test_apply_scheme_filtered_sz), + KUNIT_CASE(damos_test_apply_scheme_filter_sz_unchanged), + KUNIT_CASE(damos_test_apply_scheme_quota_sz), KUNIT_CASE(damon_test_feed_loop_next_input), KUNIT_CASE(damon_test_set_filters_default_reject), KUNIT_CASE(damon_test_apply_min_nr_regions), -- 2.53.0