The patch titled Subject: selftests/damon/damos_quota: make real expectation of quota exceeds has been added to the -mm mm-hotfixes-unstable branch. Its filename is selftests-damon-damos_quota-make-real-expectation-of-quota-exceeds.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: SeongJae Park sj@kernel.org Subject: selftests/damon/damos_quota: make real expectation of quota exceeds Date: Tue, 25 Feb 2025 14:23:31 -0800

Patch series "selftests/damon: three fixes for false results".

Fix three DAMON selftest bugs that cause two and one false positive failures and successes.

This patch (of 3):

damos_quota.py assumes the quota will always exceeded. But whether quota will be exceeded or not depend on the monitoring results. Actually the monitored workload has chaning access pattern and hence sometimes the quota may not really be exceeded. As a result, false positive test failures happen. Expect how much time the quota will be exceeded by checking the monitoring results, and use it instead of the naive assumption.

Link: https://lkml.kernel.org/r/20250225222333.505646-1-sj@kernel.org Link: https://lkml.kernel.org/r/20250225222333.505646-2-sj@kernel.org Fixes: 51f58c9da14b ("selftests/damon: add a test for DAMOS quota") Signed-off-by: SeongJae Park sj@kernel.org Cc: Shuah Khan shuah@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

tools/testing/selftests/damon/damos_quota.py | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/tools/testing/selftests/damon/damos_quota.py~selftests-damon-damos_quota-make-real-expectation-of-quota-exceeds +++ a/tools/testing/selftests/damon/damos_quota.py @@ -51,16 +51,19 @@ def main(): nr_quota_exceeds = scheme.stats.qt_exceeds

wss_collected.sort() + nr_expected_quota_exceeds = 0 for wss in wss_collected: if wss > sz_quota: print('quota is not kept: %s > %s' % (wss, sz_quota)) print('collected samples are as below') print('\n'.join(['%d' % wss for wss in wss_collected])) exit(1) + if wss == sz_quota: + nr_expected_quota_exceeds += 1

- if nr_quota_exceeds < len(wss_collected): - print('quota is not always exceeded: %d > %d' % - (len(wss_collected), nr_quota_exceeds)) + if nr_quota_exceeds < nr_expected_quota_exceeds: + print('quota is exceeded less than expected: %d < %d' % + (nr_quota_exceeds, nr_expected_quota_exceeds)) exit(1)

if __name__ == '__main__': _

Patches currently in -mm which might be from sj@kernel.org are

selftests-damon-damos_quota_goal-handle-minimum-quota-that-cannot-be-further-reduced.patch selftests-damon-damos_quota-make-real-expectation-of-quota-exceeds.patch selftests-damon-damon_nr_regions-set-ops-update-for-merge-results-check-to-100ms.patch selftests-damon-damon_nr_regions-sort-collected-regiosn-before-checking-with-min-max-boundaries.patch mm-madvise-split-out-mmap-locking-operations-for-madvise.patch mm-madvise-split-out-madvise-input-validity-check.patch mm-madvise-split-out-madvise-behavior-execution.patch mm-madvise-remove-redundant-mmap_lock-operations-from-process_madvise.patch mm-damon-avoid-applying-damos-action-to-same-entity-multiple-times.patch mm-damon-core-unset-damos-walk_completed-after-confimed-set.patch mm-damon-core-do-not-call-damos_walk_control-walk-if-walk-is-completed.patch mm-damon-core-do-damos-walking-in-entire-regions-granularity.patch mm-damon-introduce-damos-filter-type-hugepage_size-fix.patch docs-mm-damon-design-fix-typo-on-damos-filters-usage-doc-link.patch docs-mm-damon-design-document-hugepage_size-filter.patch docs-damon-move-damos-filter-type-names-and-meaning-to-design-doc.patch docs-mm-damon-design-clarify-handling-layer-based-filters-evaluation-sequence.patch docs-mm-damon-design-categorize-damos-filter-types-based-on-handling-layer.patch mm-damon-implement-a-new-damos-filter-type-for-unmapped-pages.patch docs-mm-damon-design-document-unmapped-damos-filter-type.patch