Add new CPUManager policy option for "distribute-cpus-across-numa"

This commit only adds the option to the policy options framework. A
subsequent commit will add the logic to utilize it.

The KEP describing this new option can be found here:
https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2902-cpumanager-distribute-cpus-policy-option

Signed-off-by: Kevin Klues <kklues@nvidia.com>

pkg/kubelet/cm/cpumanager/policy_options.go

@@ -26,12 +26,14 @@ import (
 )
 
 const (
-	// FullPCPUsOnlyOption is the name of the CPU Manager policy option
 	FullPCPUsOnlyOption            string = "full-pcpus-only"
+	DistributeCPUsAcrossNUMAOption string = "distribute-cpus-across-numa"
 )
 
 var (
-	alphaOptions = sets.NewString()
+	alphaOptions = sets.NewString(
+		DistributeCPUsAcrossNUMAOption,
+	)
 	betaOptions = sets.NewString(
 		FullPCPUsOnlyOption,
 	)
@@ -64,6 +66,9 @@ type StaticPolicyOptions struct {
 	// any possible naming scheme will lead to ambiguity to some extent.
 	// We picked "pcpu" because it the established docs hints at vCPU already.
 	FullPhysicalCPUsOnly bool
+	// Flag to evenly distribute CPUs across NUMA nodes in cases where more
+	// than one NUMA node is required to satisfy the allocation.
+	DistributeCPUsAcrossNUMA bool
 }
 
 func NewStaticPolicyOptions(policyOptions map[string]string) (StaticPolicyOptions, error) {
@@ -80,6 +85,12 @@ func NewStaticPolicyOptions(policyOptions map[string]string) (StaticPolicyOption
 				return opts, fmt.Errorf("bad value for option %q: %w", name, err)
 			}
 			opts.FullPhysicalCPUsOnly = optValue
+		case DistributeCPUsAcrossNUMAOption:
+			optValue, err := strconv.ParseBool(value)
+			if err != nil {
+				return opts, fmt.Errorf("bad value for option %q: %w", name, err)
+			}
+			opts.DistributeCPUsAcrossNUMA = optValue
 		default:
 			// this should never be reached, we already detect unknown options,
 			// but we keep it as further safety.