Re: [PATCH v6 2/3] KVM: dynamic halt_poll_ns adjustment

From: Wanpeng Li
Date: Thu Sep 03 2015 - 04:53:02 EST

On 9/3/15 3:31 PM, Paolo Bonzini wrote:

On 02/09/2015 21:23, David Matlack wrote:
I actually wasn't thinking about vcpu->halt_poll_ns though. If
single_task_running() breaks us out of the loop we will "goto out" instead
of scheduling. My suspicion is this will cause us to loop calling
kvm_vcpu_block and starve the waiting task (at least until need_resched()),
which would break the "only hog the cpu when idle" aspect of halt-polling.
That's definitely a bug, yes.

Ok, I will send out v7 to fix this in this sunday since there is vacation in my country currently.

Wanpeng Li


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