#!/usr/bin/env python3# SPDX-License-Identifier: GPL-2.0 import jsonimport osimport subprocessimport sys import _damon_sysfs def dump_damon_status_dict(pid):    try:        subprocess.check_output(['which', 'drgn'], stderr=subprocess.DEVNULL)    except:        return None, 'drgn not found'    file_dir = os.path.dirname(os.path.abspath(__file__))    dump_script = os.path.join(file_dir, 'drgn_dump_damon_status.py')    rc = subprocess.call(['drgn', dump_script, pid, 'damon_dump_output'],        stderr=subprocess.DEVNULL)     if rc != 0:        return None, f'drgn fail: return code({rc})'    try:        with open('damon_dump_output', 'r') as f:            return json.load(f), None    except Exception as e:        return None, 'json.load fail (%s)' % e def main():    kdamonds = _damon_sysfs.Kdamonds(        [_damon_sysfs.Kdamond(            contexts=[_damon_sysfs.DamonCtx(                schemes=[_damon_sysfs.Damos(                    ops_filters=[                        _damon_sysfs.DamosFilter(                            type_='anon',                            matching=True,                            allow=True,                        )                    ]                )],            )])]    )     err = kdamonds.start()    if err is not None:        print('kdamond start failed: %s' % err)        exit(1)     before_commit_status, err = \        dump_damon_status_dict(kdamonds.kdamonds[0].pid)    if err is not None:        print('before-commit status dump failed: %s' % err)        exit(1)     kdamonds.kdamonds[0].commit()     after_commit_status, err = \        dump_damon_status_dict(kdamonds.kdamonds[0].pid)    if err is not None:        print('after-commit status dump failed: %s' % err)        exit(1)     if before_commit_status != after_commit_status:        print(f'before: {json.dumps(before_commit_status, indent=2)}')        print(f'after: {json.dumps(after_commit_status, indent=2)}')        exit(1)     kdamonds.stop() if __name__ == '__main__':    main()