2016-07-06 15:58 GMT+08:00 Peter Zijlstra <peterz@xxxxxxxxxxxxx>: > On Wed, Jul 06, 2016 at 02:46:34PM +0800, Wanpeng Li wrote: >> > SO it's easy for ppc to implement such interface. Note that yield_count is >> > set by powerVM/KVM. >> > and only pSeries can run a guest for now. :) >> > >> > I also review x86 related code, looks like we need add one hyer-call to get >> > such vcpu preemption info? >> >> There is no such stuff to record lock holder in x86 kvm, maybe we >> don't need to depend on PLE handler algorithm to guess it if we can >> know lock holder vCPU directly. > > x86/kvm has vcpu->preempted to indicate if a vcpu is currently preempted > or not. I'm just not sure if that is visible to the guest or how to make > it so. Yeah, I miss it. I can be the volunteer to do it if there is any idea, ping Paolo. :) Regards, Wanpeng Li -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
