The Kdamond class has no way to set the kdamond-level 'refresh_ms' sysfs file, which makes DAMON periodically update the read-only sysfs files (DAMOS stats, tuned monitoring intervals and the kdamond pid) on its own.
Add a 'refresh_ms' parameter to Kdamond. When it is set (including to zero, to disable the periodic update), write it before turning the kdamond on, so tests can exercise the auto-update behavior. Leaving it unset keeps the previous behavior of not touching the file, so callers running against kernels without the feature are unaffected. Signed-off-by: Ruslan Valiyev <[email protected]> --- tools/testing/selftests/damon/_damon_sysfs.py | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/selftests/damon/_damon_sysfs.py index 2b4df655d9fd0..1a498c78a4149 100644 --- a/tools/testing/selftests/damon/_damon_sysfs.py +++ b/tools/testing/selftests/damon/_damon_sysfs.py @@ -667,12 +667,14 @@ class DamonCtx: class Kdamond: state = None pid = None + refresh_ms = None contexts = None idx = None # index of this kdamond between siblings kdamonds = None # parent - def __init__(self, contexts=[]): + def __init__(self, contexts=[], refresh_ms=None): self.contexts = contexts + self.refresh_ms = refresh_ms for idx, context in enumerate(self.contexts): context.idx = idx context.kdamond = self @@ -695,6 +697,11 @@ class Kdamond: err = context.stage() if err is not None: return err + if self.refresh_ms is not None: + err = write_file(os.path.join(self.sysfs_dir(), 'refresh_ms'), + '%d' % self.refresh_ms) + if err is not None: + return err err = write_file(os.path.join(self.sysfs_dir(), 'state'), 'on') if err is not None: return err -- 2.43.0
