Hello, On Tue, Jul 10, 2012 at 10:11:05AM +0800, Li Zefan wrote: > Right, but that should be safe. The css objects of the root cgroup are > allocated at boot, and won't be destroyed at umount. > > Furthermore when a cgroup hierarchy is going to be unmounted, those css's > will be made to point to a cgroup named dummytop in rebind_subsystems(), > and there's a syncronize_rcu() in the end of the function, so accessing > css->cgroup is always safe. > > In this case, dummytop->dentry is NULL, and that's safe too, because > cgroup_path() is aware of this case. I see. Thanks for the explanation. -- tejun -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
