wireguard-linux/tools/testing/selftests/damon/sysfs_refresh.py, branch stableWireGuard for the Linux kernelhttps://git.zx2c4.com/wireguard-linux/atom/tools/testing/selftests/damon/sysfs_refresh.py?h=stable2026-07-29T04:12:11Zselftests/damon/sysfs_refresh: test kdamond refresh_ms2026-07-29T04:12:11ZRuslan Valiyevlinuxoid@gmail.com2026-06-29T14:49:26Zurn:sha1:99cea7eb5216ff688a597595e93c123823865674
Writing a non-zero value to a kdamond's 'refresh_ms' sysfs file should
make DAMON periodically update the read-only sysfs files on its own,
without the user writing update keywords such as 'update_schemes_stats' to
the 'state' file. This behavior has no test coverage.
Add a test that starts a kdamond with refresh_ms set and a 'stat' scheme
whose default access pattern matches every monitored region, then polls
the scheme's 'nr_tried' stats file directly, without requesting an update.
The value can become non-zero only via the periodic refresh, so the test
confirms refresh_ms works; with refresh_ms disabled the stat stays zero
and the test fails.
Link: https://lore.kernel.org/20260602131217.2210912-3-linuxoid@gmail.com
Link: https://lore.kernel.org/20260629144927.134237-3-sj@kernel.org
Signed-off-by: Ruslan Valiyev <linuxoid@gmail.com>
Reviewed-by: SJ Park <sj@kernel.org>
Signed-off-by: SJ Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>