kernel/linux.git/tools/testing/selftests/damon, branch v6.19.11

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

2025-11-20T21:44:01+00:00

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

2025-11-20T21:44:01+00:00

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

2025-11-17T01:28:25+00:00

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

2025-11-17T01:28:25+00:00

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

drgn_dump_damon_status: dump damon_target->obsolete

2025-11-17T01:28:24+00:00

A new field of damon_target for pin-point target removal, namely obsolete, has newly been added. Extend drgn_dump_damon_status.py to dump it, for easily writing a future DAMON selftests of it. Link: https://lkml.kernel.org/r/20251023012535.69625-8-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/_damon_sysfs: support obsolete_target file

2025-11-17T01:28:24+00:00

A DAMON sysfs file, namely obsolete_target, has been newly introduced. Add a support of that file to _damon_sysfs.py so that DAMON selftests for the file can be easily written. Link: https://lkml.kernel.org/r/20251023012535.69625-7-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/access_memory_even: remove unused header file

2025-09-13T23:55:02+00:00

Since the time.h header file is not actually needed in this code, we can safely remove its inclusion. Link: https://lkml.kernel.org/r/20250814125417.659937-1-lienze@kylinos.cn Signed-off-by: Enze Li Reviewed-by: SeongJae Park Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/damon: fix damon selftests by installing _common.sh

2025-09-13T23:54:59+00:00

_common.sh was recently introduced but is not installed and then triggers an error when trying to run the damon selftests: selftests: damon: sysfs.sh ./sysfs.sh: line 4: _common.sh: No such file or directory Install this file to avoid this error. Link: https://lkml.kernel.org/r/20250812-alex-fixes_manual-v1-1-c4e99b1f80e4@rivosinc.com Fixes: 511914506d19 ("selftests/damon: introduce _common.sh to host shared function") Signed-off-by: Alexandre Ghiti Tested-by: Sang-Heon Jeon Reviewed-by: SeongJae Park Tested-by: Enze Li Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/damon: test no-op commit broke DAMON status

2025-09-13T23:54:55+00:00

Add test to verify that DAMON status is not changed after a no-op commit. [ekffu200098@gmail.com: change wrong json.dump usage to json.dumps] Link: https://lkml.kernel.org/r/20250816014033.190451-1-ekffu200098@gmail.com Link: https://lkml.kernel.org/r/20250810124354.16456-1-ekffu200098@gmail.com Signed-off-by: Sang-Heon Jeon Reviewed-by: SeongJae Park Cc: Honggyu Kim Signed-off-by: Andrew Morton

selftests/damon: fix selftests by installing drgn related script

2025-08-19T23:35:55+00:00

drgn_dump_damon_status is not installed during kselftest setup. It can break other tests which depend on drgn_dump_damon_status. Install drgn_dump_damon_status files to fix broken test. Link: https://lkml.kernel.org/r/20250812140046.660486-1-ekffu200098@gmail.com Fixes: f3e8e1e51362 ("selftests/damon: add drgn script for extracting damon status") Signed-off-by: Sang-Heon Jeon Reviewed-by: SeongJae Park Cc: Alexandre Ghiti Cc: Honggyu Kim Signed-off-by: Andrew Morton