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    SubjectRe: [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock
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    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.


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