Messages in this thread | | | Date | Tue, 25 Oct 2011 23:54:02 +0530 | From | Raghavendra K T <> | Subject | Re: [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to support pv-ticketlock |
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On 10/24/2011 07:20 PM, Srivatsa Vaddagiri wrote: > * Avi Kivity<avi@redhat.com> [2011-10-24 15:09:25]: > >>> I guess with that change, we can also dropthe need for other hypercall >>> introduced in this patch (kvm_pv_kick_cpu_op()). Essentially a vcpu sleeping >>> because of HLT instruction can be woken up by a IPI issued by vcpu releasing a >>> lock. >> >> Not if interrupts are disabled. > > Hmm yes ..so we need a kick hypercall then. >
So then do also you foresee the need for directed yield at some point, to address LHP? provided we have good improvements to prove.
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