Cache the discovered topology in the CPUManager instead of MachineInfo

pkg/kubelet/cm/cpumanager/cpu_manager.go

@@ -94,7 +94,7 @@ type manager struct {
 	// and the containerID of their containers
 	podStatusProvider status.PodStatusProvider
 
-	machineInfo *cadvisorapi.MachineInfo
+	topology *topology.CPUTopology
 
 	nodeAllocatableReservation v1.ResourceList
 }
@@ -103,6 +103,7 @@ var _ Manager = &manager{}
 
 // NewManager creates new cpu manager based on provided policy
 func NewManager(cpuPolicyName string, reconcilePeriod time.Duration, machineInfo *cadvisorapi.MachineInfo, nodeAllocatableReservation v1.ResourceList, stateFileDirectory string, affinity topologymanager.Store) (Manager, error) {
+	var topo *topology.CPUTopology
 	var policy Policy
 
 	switch policyName(cpuPolicyName) {
@@ -111,6 +112,7 @@ func NewManager(cpuPolicyName string, reconcilePeriod time.Duration, machineInfo
 		policy = NewNonePolicy()
 
 	case PolicyStatic:
+		var err error
 		topo, err := topology.Discover(machineInfo)
 		if err != nil {
 			return nil, err
@@ -149,7 +151,7 @@ func NewManager(cpuPolicyName string, reconcilePeriod time.Duration, machineInfo
 		policy:                     policy,
 		reconcilePeriod:            reconcilePeriod,
 		state:                      stateImpl,
-		machineInfo:                machineInfo,
+		topology:                   topo,
 		nodeAllocatableReservation: nodeAllocatableReservation,
 	}
 	return manager, nil

pkg/kubelet/cm/cpumanager/topology_hints.go

@@ -20,7 +20,6 @@ import (
 	"k8s.io/api/core/v1"
 	"k8s.io/klog"
 
-	"k8s.io/kubernetes/pkg/kubelet/cm/cpumanager/topology"
 	"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
 	"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
 	"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager/socketmask"
@@ -72,26 +71,18 @@ func (m *manager) GetTopologyHints(pod v1.Pod, container v1.Container) map[strin
 // bits set as the narrowest matching SocketAffinity with 'Preferred: true', and
 // marking all others with 'Preferred: false'.
 func (m *manager) generateCPUTopologyHints(availableCPUs cpuset.CPUSet, request int) []topologymanager.TopologyHint {
-	// Discover topology in order to establish the number
-	// of available CPUs per socket.
-	topo, err := topology.Discover(m.machineInfo)
-	if err != nil {
-		klog.Warningf("[cpu manager] Error discovering topology for TopologyHint generation")
-		return nil
-	}
-
 	// Initialize minAffinity to a full affinity mask.
 	minAffinity, _ := socketmask.NewSocketMask()
 	minAffinity.Fill()
 
 	// Iterate through all combinations of socketMasks and build hints from them.
 	hints := []topologymanager.TopologyHint{}
-	socketmask.IterateSocketMasks(topo.CPUDetails.Sockets().ToSlice(), func(mask socketmask.SocketMask) {
+	socketmask.IterateSocketMasks(m.topology.CPUDetails.Sockets().ToSlice(), func(mask socketmask.SocketMask) {
 		// Check to see if we have enough CPUs available on the current
 		// SocketMask to satisfy the CPU request.
 		numMatching := 0
 		for _, c := range availableCPUs.ToSlice() {
-			if mask.IsSet(topo.CPUDetails[c].SocketID) {
+			if mask.IsSet(m.topology.CPUDetails[c].SocketID) {
 				numMatching++
 			}
 		}

pkg/kubelet/cm/cpumanager/topology_hints_test.go

@@ -23,6 +23,7 @@ import (
 
 	cadvisorapi "github.com/google/cadvisor/info/v1"
 	v1 "k8s.io/api/core/v1"
+	"k8s.io/kubernetes/pkg/kubelet/cm/cpumanager/topology"
 	"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
 	"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
 	"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager/socketmask"
@@ -49,30 +50,36 @@ func TestGetTopologyHints(t *testing.T) {
 	secondSocketMask, _ := socketmask.NewSocketMask(1)
 	crossSocketMask, _ := socketmask.NewSocketMask(0, 1)
 
-	m := manager{
-		policy: &staticPolicy{},
-		machineInfo: &cadvisorapi.MachineInfo{
-			NumCores: 12,
-			Topology: []cadvisorapi.Node{
-				{Id: 0,
-					Cores: []cadvisorapi.Core{
-						{Id: 0, Threads: []int{0, 6}},
-						{Id: 1, Threads: []int{1, 7}},
-						{Id: 2, Threads: []int{2, 8}},
-					},
-				},
-				{Id: 1,
-					Cores: []cadvisorapi.Core{
-						{Id: 0, Threads: []int{3, 9}},
-						{Id: 1, Threads: []int{4, 10}},
-						{Id: 2, Threads: []int{5, 11}},
-					},
+	machineInfo := cadvisorapi.MachineInfo{
+		NumCores: 12,
+		Topology: []cadvisorapi.Node{
+			{Id: 0,
+				Cores: []cadvisorapi.Core{
+					{Id: 0, Threads: []int{0, 6}},
+					{Id: 1, Threads: []int{1, 7}},
+					{Id: 2, Threads: []int{2, 8}},
 				},
 			},
+			{Id: 1,
+				Cores: []cadvisorapi.Core{
+					{Id: 0, Threads: []int{3, 9}},
+					{Id: 1, Threads: []int{4, 10}},
+					{Id: 2, Threads: []int{5, 11}},
+				},
+			},
+		},
+	}
+
+	topology, _ := topology.Discover(&machineInfo)
+
+	m := manager{
+		policy: &staticPolicy{
+			topology: topology,
 		},
 		state: &mockState{
 			defaultCPUSet: cpuset.NewCPUSet(2, 3, 4, 5, 6, 7, 8, 9, 10, 11),
 		},
+		topology: topology,
 	}
 
 	tcases := []struct {