On Mon, May 14, 2018 at 03:31:07PM -0400, Waiman Long wrote: > The percpu_rwsem_release() is called when the ownership of the embedded > rwsem is to be transferred to another task. The new owner, however, may > take a while to get the ownership of the lock via percpu_rwsem_acquire(). > During that period, the rwsem is now marked as writer-owned with no > optimistic spinning. This does not explain the problem sufficiently to even begin considering if the proposed solution is sensible.
