[RFC PATCH v1.3 0/4] mm/damon: fix misc bugs in kunit, quota goals and sysfs refresh_ms

[RFC PATCH v1.3 0/4] mm/damon: fix misc bugs in kunit, quota goals and sysfs refresh_ms

[SJ Park]

DAMOS quota goals commit unit test is mistakenly not testing a test case
that was designed to test.  DAMOS quota goals and DAMON sysfs refresh_ms
file have bugs that can produce non critical but still unexpected
behaviors.  Fix the bugs.

Patch 1 fixes the DAMOS quota goals commit unit test to cover a
mistakenly uncovered case.  Patches 2 and 3 fix the bugs in DAMOS PSI
goal initialization and eligible_mem_bp online commit, respectively.
Patch 4 fixes the bug in DAMON sysfs refresh_ms file handling.

Changes from RFC v1.2
- RFC v1.2: https://lore.kernel.org/20260828014659.121058-1-sj@kernel.org
- Fix last_psi_total underflow.
Changes from RFC v1.1
- RFC v1.1: https://lore.kernel.org/20260827134429.123023-1-sj@kernel.org
- Fix quota goals commit unit test that was mistakenly missing a test case.
- Initialize last_psi_total as uninitialized at the beginning.
- Correct kunit test for changed last_psi_total initialization behavior.
Changes from RFC
- RFC: https://lore.kernel.org/20260827042920.93580-1-sj@kernel.org
  (Mistakenly missed RFC tag)
- Fix build error.
- Add eligible_mem_bp nid commit fix.

SJ Park (4):
  mm/damon/tests/core-kunit: test committing psi goal to psi goal
  mm/damon/core: handle uninitialized damos_quota_goal->last_psi_total
  mm/damon/core: copy nid for eligible_mem_bp damos quota goal commit
  mm/damon/sysfs: set next refresh jiffies per sysfs context

 mm/damon/core.c             | 16 ++++++++++++++--
 mm/damon/sysfs.c            | 11 +++++------
 mm/damon/tests/core-kunit.h | 16 ++++++++++------
 3 files changed, 29 insertions(+), 14 deletions(-)


base-commit: f508ed0a3bc67ac2a17ba4eaa7f219a95f6b3954
-- 
2.47.3

[RFC PATCH v1.3 1/4] mm/damon/tests/core-kunit: test committing psi goal to psi goal

[SJ Park]

damon_test_commit_quota_goal_for() is set to test committing a new psi
goal on an existing psi goal.  However, damon_test_commit_quota_goal()
is mistakenly not covering the test case.  Add the test case.

Fixes: 99f89debafc5 ("mm/damon/tests/core-kunit: add damos_commit_quota_goal() test")
Cc: <stable@vger.kernel.org> # 6.19.x
Signed-off-by: SJ Park <sj@kernel.org>
---
 mm/damon/tests/core-kunit.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 4a536d41cdb2d..b643f9a83f14a 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -787,6 +787,13 @@ static void damos_test_commit_quota_goal(struct kunit *test)
 		.last_psi_total = 456,
 	};
 
+	damos_test_commit_quota_goal_for(test, &dst,
+			&(struct damos_quota_goal) {
+			.metric = DAMOS_QUOTA_SOME_MEM_PSI_US,
+			.target_value = 234,
+			.current_value = 345,
+			.last_psi_total = 567,
+			});
 	damos_test_commit_quota_goal_for(test, &dst,
 			&(struct damos_quota_goal){
 			.metric = DAMOS_QUOTA_USER_INPUT,
-- 
2.47.3