On Tue, Nov 30, 2021 at 10:56:34PM -0500, Waiman Long <longman@xxxxxxxxxx> wrote: > > > A valid parent partition may distribute out all its CPUs to > > > its child partitions as long as it is not the root cgroup and > > > there is no task associated with it. > > A valid parent partition which isn't root never has tasks in them to begin > > with. > I believe there is some corner cases where it is possible to put task in an > intermediate partition. That is why I put down this statement. Just mind the threads -- cpuset controller is threaded and having tasks in inner cgroup nodes is a real scenario. I wouldn't consider it a corner case. [ Actually, the paragraph could IMO be simplified: > A valid parent partition may distribute out all its CPUs to > its child partitions as long as there is no task associated with it. Assuming there's always at least one kernel thread in the root cgroup that can't be migrated anyway.] Michal
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