kernel/tools/testing/selftests/damon/sysfs.py, branch linux-rolling-stable

selftests/damon/sysfs.py: merge DAMON status dumping into commitment assertion

2025-11-20T21:44:01Z

For each test case, sysfs.py makes changes to DAMON, dumps DAMON internal status and asserts the expectation is met. The dumping part should be the same for all cases, so it is duplicated for each test case. Which means it is easy to make mistakes. Actually a few of those duplicates are not turning DAMON off in case of the dumping failure. It makes following selftests that need to turn DAMON on fails with -EBUSY. Merge the status dumping into commitment assertion with proper dumping failure handling, to deduplicate and avoid the unnecessary following tests failures. Link: https://lkml.kernel.org/r/20251112154114.66053-8-sj@kernel.org Signed-off-by: SeongJae Park Cc: Bill Wendling Cc: Brendan Higgins Cc: David Gow Cc: David Hildenbrand Cc: Hugh Dickins Cc: Jonathan Corbet Cc: Justin Stitt Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Miguel Ojeda Cc: Mike Rapoport Cc: Nathan Chancellor Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm/damon: rename damos->filters to damos->core_filters

2025-11-20T21:44:01Z

DAMOS filters that are handled by the ops layer are linked to damos->ops_filters. Owing to the ops_ prefix on the name, it is easy to understand it is for ops layer handled filters. The other types of filters, which are handled by the core layer, are linked to damos->filters. Because of the name, it is easy to confuse the list is there for not only core layer handled ones but all filters. Avoid such confusions by renaming the field to core_filters. Link: https://lkml.kernel.org/r/20251112154114.66053-3-sj@kernel.org Signed-off-by: SeongJae Park Cc: Bill Wendling Cc: Brendan Higgins Cc: David Gow Cc: David Hildenbrand Cc: Hugh Dickins Cc: Jonathan Corbet Cc: Justin Stitt Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Miguel Ojeda Cc: Mike Rapoport Cc: Nathan Chancellor Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

selftests/damon/sysfs: add obsolete_target test

2025-11-17T01:28:25Z

A new DAMON sysfs file for pin-point target removal, namely obsolete_target, has been added. Add a test for the functionality. It starts DAMON with three monitoring target processes, mark one in the middle as obsolete, commit it, and confirm the internal DAMON status is updated to remove the target in the middle. Link: https://lkml.kernel.org/r/20251023012535.69625-10-sj@kernel.org Signed-off-by: SeongJae Park Cc: Bijan Tabatabai Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

sysfs.py: extend assert_ctx_committed() for monitoring targets

2025-11-17T01:28:25Z

assert_ctx_committed() is not asserting monitoring targets commitment, since all existing callers of the function assume no target changes. Extend it for future usage. Link: https://lkml.kernel.org/r/20251023012535.69625-9-sj@kernel.org Signed-off-by: SeongJae Park Cc: Bijan Tabatabai Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

selftests/damon/sysfs.py: test runtime reduction of DAMON parameters

2025-07-26T22:08:21Z

sysfs.py is testing if non-default additional parameters can be committed. Add a test case for further reducing the parameters to the default set. Link: https://lkml.kernel.org/r/20250720171652.92309-23-sj@kernel.org Signed-off-by: SeongJae Park Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/damon/sysfs.py: test non-default parameters runtime commit

2025-07-26T22:08:21Z

sysfs.py is testing only the default and minimum DAMON parameters. Add another test case for more non-default additional DAMON parameters commitment on runtime. Link: https://lkml.kernel.org/r/20250720171652.92309-22-sj@kernel.org Signed-off-by: SeongJae Park Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/damon/sysfs.py: generalize DAMON context commit assertion

2025-07-26T22:08:21Z

DAMON context commitment assertion is hard-coded for a specific test case. Split it out into a general version that can be reused for different test cases. Link: https://lkml.kernel.org/r/20250720171652.92309-21-sj@kernel.org Signed-off-by: SeongJae Park Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/damon/sysfs.py: generalize monitoring attributes commit assertion

2025-07-26T22:08:20Z

DAMON monitoring attributes commitment assertion is hard-coded for a specific test case. Split it out into a general version that can be reused for different test cases. Link: https://lkml.kernel.org/r/20250720171652.92309-20-sj@kernel.org Signed-off-by: SeongJae Park Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/damon/sysfs.py: generalize DAMOS schemes commit assertion

2025-07-26T22:08:20Z

DAMOS schemes commitment assertion is hard-coded for a specific test case. Split it out into a general version that can be reused for different test cases. Link: https://lkml.kernel.org/r/20250720171652.92309-19-sj@kernel.org Signed-off-by: SeongJae Park Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/damon/sysfs.py: test DAMOS filters commitment

2025-07-26T22:08:20Z

Current DAMOS scheme commitment assertion is not testing DAMOS filters. Add the test. Link: https://lkml.kernel.org/r/20250720171652.92309-18-sj@kernel.org Signed-off-by: SeongJae Park Cc: Shuah Khan Signed-off-by: Andrew Morton