> > About your suggestion, the *cgroup_id helpers only works for cgroup v2, > > however, we're still using cgroup v1 in product,and even for cgroup v2, > > I'm not sure if there is any way for user space to get this cgroup id > > timely(after container created, but before container start to run)。 > > > > So if there is any effective way works for cgroup v1? > > https://github.com/systemd/systemd/blob/main/NEWS#L379 I agree that we should not focus on cgroup v1 if we do add a helper.