RFC mm/damon: add kunit and selftests for probes and probe weights

DAMON recently introduced probes and probe weights. Add kunit and selftests for ensuring the parameters for features can be set using the core API and the sysfs ABI, respectively.

Changes from RFC v1
- RFC v1: https://lore.kernel.org/[email protected]
- Fix a typo, memory leak and NULL dereference in kunit test.
- Fix ignored error in selftest.

SJ Park (6):
mm/damon/tests/core-kunit: test damon_commit_filter() mm/damon/tests/core-kunit: add damon_commit_probes() test selftests/damon/_damon_sysfs: implement DamonProbes selftests/damon/drgn_dump_damon_status: dump probes selftests/damon/sysfs.py: extend commit assertion function for probes selftests/damon/sysfs.py: test damon probes

 mm/damon/tests/core-kunit.h                   | 124 +++++++++++++++++
 tools/testing/selftests/damon/_damon_sysfs.py | 125 +++++++++++++++++-
 .../selftests/damon/drgn_dump_damon_status.py |  32 +++++
 tools/testing/selftests/damon/sysfs.py        |  35 ++++-
 4 files changed, 314 insertions(+), 2 deletions(-)

base-commit: 1e413a0c40e2aca4a55f9ba664b2b7ac2a03c9da

2.47.3