KVM: Don't shrink/grow vCPU halt_poll_ns if host side polling is disabled (44551b2f) · Commits · 戴 / test

Don't waste cycles to shrink/grow vCPU halt_poll_ns if host side polling is disabled. Acked-by:

Marcelo Tosatti <mtosatti@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:

virt/kvm/kvm_main.c

+16 −13

Original line number	Diff line number	Diff line
		@@ -2360,9 +2360,10 @@ out:
		kvm_arch_vcpu_unblocking(vcpu);
		block_ns = ktime_to_ns(cur) - ktime_to_ns(start);

		if (!vcpu_valid_wakeup(vcpu))
		if (!kvm_arch_no_poll(vcpu)) {
		if (!vcpu_valid_wakeup(vcpu)) {
		shrink_halt_poll_ns(vcpu);
		else if (halt_poll_ns) {
		} else if (halt_poll_ns) {
		if (block_ns <= vcpu->halt_poll_ns)
		;
		/* we had a long block, shrink polling */
		@@ -2372,8 +2373,10 @@ out:
		else if (vcpu->halt_poll_ns < halt_poll_ns &&
		block_ns < halt_poll_ns)
		grow_halt_poll_ns(vcpu);
		} else
		} else {
		vcpu->halt_poll_ns = 0;
		}
		}

		trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
		kvm_arch_vcpu_block_finish(vcpu);