node: cpu-mgr: Add logs when CPU allocation is skipped

CPU Allocation is skipped in CPU Manager with static policy
in case the pod doesn't belong to Guaranteed QoS or the CPUs
requested are not integral.

We add logs to capture these skips.

Signed-off-by: Swati Sehgal <[email protected]>

Author: swatisehgal

pkg/kubelet/cm/cpumanager/policy_static.go

@@ -456,7 +456,9 @@ func (p *staticPolicy) allocateCPUs(s state.State, numCPUs int, numaAffinity bit
 }
 
 func (p *staticPolicy) guaranteedCPUs(pod *v1.Pod, container *v1.Container) int {
-	if v1qos.GetPodQOS(pod) != v1.PodQOSGuaranteed {
+	qos := v1qos.GetPodQOS(pod)
+	if qos != v1.PodQOSGuaranteed {
+		klog.V(5).InfoS("Exclusive CPU allocation skipped, pod QoS is not guaranteed", "pod", klog.KObj(pod), "containerName", container.Name, "qos", qos)
 		return 0
 	}
 	cpuQuantity := container.Resources.Requests[v1.ResourceCPU]
@@ -469,7 +471,9 @@ func (p *staticPolicy) guaranteedCPUs(pod *v1.Pod, container *v1.Container) int
 			cpuQuantity = cs.AllocatedResources[v1.ResourceCPU]
 		}
 	}
-	if cpuQuantity.Value()*1000 != cpuQuantity.MilliValue() {
+	cpuValue := cpuQuantity.Value()
+	if cpuValue*1000 != cpuQuantity.MilliValue() {
+		klog.V(5).InfoS("Exclusive CPU allocation skipped, pod is not requesting integral CPUs", "pod", klog.KObj(pod), "containerName", container.Name, "cpu", cpuValue)
 		return 0
 	}
 	// Safe downcast to do for all systems with < 2.1 billion CPUs.