On Tue, 4 Jul 2017, Davidlohr Bueso wrote: > 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. Compared to a mutex_lock/unlock() pair on a global mutex .... -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
