On 07/18/2018 04:19 AM, Peter Zijlstra wrote: > On Tue, Jul 17, 2018 at 04:16:00PM -0400, Waiman Long wrote: >> The LOCK_PREFIX macro should be used in the assembly >> __raw_callee_save___pv_queued_spin_unlock code so that the lock prefix >> can be patched out on UP systems. > True; but does paravirt locking realy make sense on UP guests? > Yes, it doesn't make sense. That is why I have another kvm patch that turns off pvqspinlock for UP guest. However, I am not that familiar with the Xen code. So I don't have a corresponding one for Xen.
Cheers, Longman
