node: cpumgr: address golint complains

Add docstrings and trivial fixes.

Signed-off-by: Francesco Romani <fromani@redhat.com>

pkg/kubelet/cm/cpumanager/cpu_assignment.go

@@ -27,8 +27,10 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
 )
 
+// LoopControl controls the behavior of the cpu accumulator loop logic
 type LoopControl int
 
+// Possible loop control outcomes
 const (
 	Continue LoopControl = iota
 	Break

pkg/kubelet/cm/cpumanager/policy_options.go

@@ -27,6 +27,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
 )
 
+// Names of the options, as part of the user interface.
 const (
 	FullPCPUsOnlyOption            string = "full-pcpus-only"
 	DistributeCPUsAcrossNUMAOption string = "distribute-cpus-across-numa"
@@ -44,6 +45,8 @@ var (
 	stableOptions = sets.NewString()
 )
 
+// CheckPolicyOptionAvailable verifies if the given option can be used depending on the Feature Gate Settings.
+// returns nil on success, or an error describing the failure on error.
 func CheckPolicyOptionAvailable(option string) error {
 	if !alphaOptions.Has(option) && !betaOptions.Has(option) && !stableOptions.Has(option) {
 		return fmt.Errorf("unknown CPU Manager Policy option: %q", option)
@@ -60,6 +63,7 @@ func CheckPolicyOptionAvailable(option string) error {
 	return nil
 }
 
+// StaticPolicyOptions holds the parsed value of the policy options, ready to be consumed internally.
 type StaticPolicyOptions struct {
 	// flag to enable extra allocation restrictions to avoid
 	// different containers to possibly end up on the same core.
@@ -78,6 +82,7 @@ type StaticPolicyOptions struct {
 	AlignBySocket bool
 }
 
+// NewStaticPolicyOptions creates a StaticPolicyOptions struct from the user configuration.
 func NewStaticPolicyOptions(policyOptions map[string]string) (StaticPolicyOptions, error) {
 	opts := StaticPolicyOptions{}
 	for name, value := range policyOptions {
@@ -113,6 +118,7 @@ func NewStaticPolicyOptions(policyOptions map[string]string) (StaticPolicyOption
 	return opts, nil
 }
 
+// ValidateStaticPolicyOptions ensures that the requested policy options are compatible with the machine on which the CPUManager is running.
 func ValidateStaticPolicyOptions(opts StaticPolicyOptions, topology *topology.CPUTopology, topologyManager topologymanager.Store) error {
 	if opts.AlignBySocket {
 		// Not compatible with topology manager single-numa-node policy option.

pkg/kubelet/cm/cpumanager/policy_static.go

@@ -51,6 +51,7 @@ func (e SMTAlignmentError) Error() string {
 	return fmt.Sprintf("SMT Alignment Error: requested %d cpus not multiple cpus per core = %d", e.RequestedCPUs, e.CpusPerCore)
 }
 
+// Type returns human-readable type of this error. Used in the admission control to populate Admission Failure reason.
 func (e SMTAlignmentError) Type() string {
 	return ErrorSMTAlignment
 }

pkg/kubelet/cm/cpumanager/topology_hints_test.go

@@ -264,7 +264,7 @@ func TestGetPodTopologyHintsWithPolicyOptions(t *testing.T) {
 	testPod2 := makePod("fakePod", "fakeContainer", "41", "41")
 	testContainer2 := &testPod1.Spec.Containers[0]
 
-	cpu_set_across_socket, _ := cpuset.Parse("0-28,40-57")
+	cpuSetAcrossSocket, _ := cpuset.Parse("0-28,40-57")
 
 	m0001, _ := bitmask.NewBitMask(0)
 	m0011, _ := bitmask.NewBitMask(0, 1)
@@ -376,7 +376,7 @@ func TestGetPodTopologyHintsWithPolicyOptions(t *testing.T) {
 			description:   "AlignBySocket:true Preferred hints are spread across socket since 2 sockets are required",
 			pod:           *testPod2,
 			container:     *testContainer2,
-			defaultCPUSet: cpu_set_across_socket,
+			defaultCPUSet: cpuSetAcrossSocket,
 			topology:      topoDualSocketMultiNumaPerSocketHT,
 			policyOptions: map[string]string{AlignBySocketOption: "true"},
 			expectedHints: []topologymanager.TopologyHint{