On Thu 14-11-19 11:20:18, Tejun Heo wrote: > Hello, > > On Thu, Nov 14, 2019 at 08:16:57PM +0100, Michal Hocko wrote: > > Then what is the point of this function and what about all other users? > > It is useful for controlling admissions of new userspace visible uses > - e.g. a tracepoint shouldn't be allowed to be attached to a cgroup > which has already been deleted. I am not sure I understand. Roman says that the cgroup can get offline right after the function returns. How is "already deleted" different from "just deleted"? I thought that the state is preserved at least while the rcu lock is held but my memory is dim here. > We're just using it too liberally. Can we get a doc update to be explicit about sensible usecases so that others can be dropped accordingly? -- Michal Hocko SUSE Labs
