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_damon_sysfs: implement commit() for online parameters update

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Users can update DAMON parameters while it is running, using 'commit'
DAMON sysfs interface command.  For testing the feature in future tests,
implement a function for doing that on the test-purpose DAMON sysfs
interface wrapper Python module.

Link: https://lkml.kernel.org/r/20240625180538.73134-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2024-06-25 11:05:37 -07:00 committed by Andrew Morton
parent 781497347d
commit 5ac9adecf0
1 changed files with 19 additions and 0 deletions
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19
tools/testing/selftests/damon/_damon_sysfs.py
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@ -481,6 +481,25 @@ class Kdamond:
goal.effective_bytes = int(content) goal.effective_bytes = int(content)
return None return None
def commit(self):
nr_contexts_file = os.path.join(self.sysfs_dir(),
'contexts', 'nr_contexts')
content, err = read_file(nr_contexts_file)
if err is not None:
return err
if int(content) != len(self.contexts):
err = write_file(nr_contexts_file, '%d' % len(self.contexts))
if err is not None:
return err
for context in self.contexts:
err = context.stage()
if err is not None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'state'), 'commit')
return err
def commit_schemes_quota_goals(self): def commit_schemes_quota_goals(self):
for context in self.contexts: for context in self.contexts:
for scheme in context.schemes: for scheme in context.schemes: