Hello, On Wed, Jan 08, 2025 at 02:50:19PM -0500, Waiman Long wrote: ... > It is not the strict ordering that I am worrying about. It is all about the > possibility of hitting some race conditions. > > I am thinking of a scenario where a cpuset loses all its CPUs in hotunplug > and then restored by adding other CPUs. There is chance that the css will be > operated on concurrently by the auto-transfer task and another task moving > new task to the css. I am not sure if that will be a problem or not. Anyway, > it is very rare that we will be in such a situation. Hmm... I might be missing something but cgroup_transfer_tasks() is fully synchronized against migrations. I don't see anything dangerous there. Thanks. -- tejun
