On Tue, 2015-08-11 at 09:07 -0600, Jan Beulich wrote: > > > > On 03.08.15 at 13:29, <ian.campb...@citrix.com> wrote: > > From: David Vrabel <david.vra...@citrix.com> > > > > Instead of cpu_relax() while spinning and observing the ticket head, > > introduce arch_lock_relax() which executes a WFE instruction. After > > the ticket head is changed call arch_lock_signal() to execute an SEV > > instruction (with the required DSB first) to wake any spinners. > > > > This should improve power consumption when locks are contented and > > spinning. > > So why not use MONITOR/MWAIT on x86 for the same purpose?
I'll leave this for an x86 person to decide/implement. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
