On 07/09/2012 02:20 AM, Raghavendra K T wrote:
+bool kvm_arch_vcpu_check_and_update_eligible(struct kvm_vcpu *vcpu)
+{
+ bool eligible;
+
+ eligible = !vcpu->arch.plo.pause_loop_exited ||
+ (vcpu->arch.plo.pause_loop_exited&&
+ vcpu->arch.plo.dy_eligible);
+
+ if (vcpu->arch.plo.pause_loop_exited)
+ vcpu->arch.plo.dy_eligible = !vcpu->arch.plo.dy_eligible;
+
+ return eligible;
+}
This is a nice simple mechanism to skip CPUs that were
eligible last time and had pause loop exits recently.
However, it could stand some documentation. Please
add a good comment explaining how and why the algorithm
works, when arch.plo.pause_loop_exited is cleared, etc...
It would be good to make this heuristic understandable
to people who look at the code for the first time.
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