Commit 5ac9adec authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

_damon_sysfs: implement commit() for online parameters update 

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: default avatarSeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 78149734

tools/testing/selftests/damon/_damon_sysfs.py

+19 −0
Original line number Diff line number Diff line
@@ -481,6 +481,25 @@ class Kdamond: 
                    goal.effective_bytes = int(content)

        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):

        for context in self.contexts:

            for scheme in context.schemes: