Messages in this thread | | | From | Wanpeng Li <> | Date | Mon, 26 Apr 2021 11:58:19 +0800 | Subject | Re: [RFC PATCH 0/2] Mitigating Excessive Pause-Loop Exiting in VM-Agnostic KVM |
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On Mon, 26 Apr 2021 at 11:19, Kenta Ishiguro <kentaishiguro@sslab.ics.keio.ac.jp> wrote: > > Thank you for the reply. > > My question is about following scenario: > 1. running vCPU receives IPI and the vCPU's ipi_received gets true > 2. the vCPU responds to the IPI > 3. the vCPU exits > 4. the vCPU is preempted by KVM > 5. the vCPU is boosted, but it has already responded to the IPI > 6. the vCPU enters and the vCPU's ipi_received is cleaned > > In this case, I think the check of vcpu->preempted does not limit the candidate vCPUs.
Good point, you are right. However, actually I played with that code a bit before, I have another version adding the vcpu->preempted checking when marking IPI receiver, the score is not as good as expected.
Wanpeng
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