On Tue, 04 Jul 2017, Davidlohr Bueso wrote:
As a side effect you end up optimizing get/put_online_mems() at the cost of more overhead for the actual hotplug operation, which is rare and of less performance importance.
So nm this, the reader side actually gets _more_ expensive with pcpu-rwsems due to at least two full barriers for each get/put operation. Thanks, Davidlohr
