On Mon, Jul 10, 2023 at 11:40:36AM -0400, Waiman Long <longman@xxxxxxxxxx> wrote: > I believe the primary reason is because update_parent_subparts_cpumask() can > potential run for quite a while. So we don't want to hold the rcu_read_lock > for too long. But holding cpuset_mutex is even worse than rcu_read_lock()? IOW is the relieve with this reason worth it? > There may also be a potential that schedule() may be called. Do you mean the spinlocks with PREEMPT_RT or anything else? (That seems like the actual reason IIUC.) Thanks, Michal
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