On 02/08/2017 02:05 PM, Peter Zijlstra wrote: > On Wed, Feb 08, 2017 at 01:00:25PM -0500, Waiman Long wrote: >> As the vcpu_is_preempted() call is pretty costly compared with other >> checks within mutex_spin_on_owner() and rwsem_spin_on_owner(), they >> are done at a reduce frequency of once every 256 iterations. > That's just disgusting. I do have some doubt myself on the effectiveness of this patch. Anyway, it is the first patch that I think is more beneficial. Cheers, Longman
