On Wed, 2011-01-19 at 22:53 +0530, Srivatsa Vaddagiri wrote: > On Wed, Jan 19, 2011 at 10:42:39PM +0530, Srivatsa Vaddagiri wrote: > > Add two hypercalls to KVM hypervisor to support pv-ticketlocks. > > > > KVM_HC_WAIT_FOR_KICK blocks the calling vcpu until another vcpu kicks it or > > it > > is woken up because of an event like interrupt. > > One possibility is to extend this hypercall to do a directed yield as well, > which needs some more thought. Another issue that needs to be resolved with > pv-ticketlocks is the impact on intra-VM fairness. A guest experiencing heavy > contention can keep yielding cpu, allowing other VMs to get more time than > they > deserve.
No, yield sucks, if you know the owner you can do actual PI. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/virtualization
