s := "["
	for _, req := range a {
		s += fmt.Sprintf("(res: %v, q: %d), ", req.resourceName, req.quantity)
	}
	return s + "]"
}

// sortPodsByQOS returns lists containing besteffort, burstable, and guaranteed pods that
// can be preempted by preemptor pod.
func sortPodsByQOS(preemptor *v1.Pod, pods []*v1.Pod) (bestEffort, burstable, guaranteed []*v1.Pod) {
	for _, pod := range pods {
		if kubetypes.Preemptable(preemptor, pod) {