memory manager: do not clean admitted pods from the state

Signed-off-by: Artyom Lukianov <alukiano@redhat.com>

pkg/kubelet/cm/memorymanager/memory_manager.go

@@ -124,6 +124,9 @@ type manager struct {
 
 	// allocatableMemory holds the allocatable memory for each NUMA node
 	allocatableMemory []state.Block
+
+	// pendingAdmissionPod contain the pod during the admission phase
+	pendingAdmissionPod *v1.Pod
 }
 
 var _ Manager = &manager{}
@@ -230,6 +233,10 @@ func (m *manager) GetMemoryNUMANodes(pod *v1.Pod, container *v1.Container) sets.
 
 // Allocate is called to pre-allocate memory resources during Pod admission.
 func (m *manager) Allocate(pod *v1.Pod, container *v1.Container) error {
+	// The pod is during the admission phase. We need to save the pod to avoid it
+	// being cleaned before the admission ended
+	m.setPodPendingAdmission(pod)
+
 	// Garbage collect any stranded resources before allocation
 	m.removeStaleState()
 
@@ -268,6 +275,10 @@ func (m *manager) State() state.Reader {
 
 // GetPodTopologyHints returns the topology hints for the topology manager
 func (m *manager) GetPodTopologyHints(pod *v1.Pod) map[string][]topologymanager.TopologyHint {
+	// The pod is during the admission phase. We need to save the pod to avoid it
+	// being cleaned before the admission ended
+	m.setPodPendingAdmission(pod)
+
 	// Garbage collect any stranded resources before providing TopologyHints
 	m.removeStaleState()
 	// Delegate to active policy
@@ -276,6 +287,10 @@ func (m *manager) GetPodTopologyHints(pod *v1.Pod) map[string][]topologymanager.
 
 // GetTopologyHints returns the topology hints for the topology manager
 func (m *manager) GetTopologyHints(pod *v1.Pod, container *v1.Container) map[string][]topologymanager.TopologyHint {
+	// The pod is during the admission phase. We need to save the pod to avoid it
+	// being cleaned before the admission ended
+	m.setPodPendingAdmission(pod)
+
 	// Garbage collect any stranded resources before providing TopologyHints
 	m.removeStaleState()
 	// Delegate to active policy
@@ -298,12 +313,15 @@ func (m *manager) removeStaleState() {
 	m.Lock()
 	defer m.Unlock()
 
-	// Get the list of active pods.
+	// Get the list of admitted and active pods.
-	activePods := m.activePods()
+	activeAndAdmittedPods := m.activePods()
+	if m.pendingAdmissionPod != nil {
+		activeAndAdmittedPods = append(activeAndAdmittedPods, m.pendingAdmissionPod)
+	}
 
 	// Build a list of (podUID, containerName) pairs for all containers in all active Pods.
 	activeContainers := make(map[string]map[string]struct{})
-	for _, pod := range activePods {
+	for _, pod := range activeAndAdmittedPods {
 		activeContainers[string(pod.UID)] = make(map[string]struct{})
 		for _, container := range append(pod.Spec.InitContainers, pod.Spec.Containers...) {
 			activeContainers[string(pod.UID)][container.Name] = struct{}{}
@@ -430,3 +448,10 @@ func (m *manager) GetAllocatableMemory() []state.Block {
 func (m *manager) GetMemory(podUID, containerName string) []state.Block {
 	return m.state.GetMemoryBlocks(podUID, containerName)
 }
+
+func (m *manager) setPodPendingAdmission(pod *v1.Pod) {
+	m.Lock()
+	defer m.Unlock()
+
+	m.pendingAdmissionPod = pod
+}

pkg/kubelet/cm/memorymanager/memory_manager_test.go

@@ -2019,6 +2019,129 @@ func TestNewManager(t *testing.T) {
 
 func TestGetTopologyHints(t *testing.T) {
 	testCases := []testMemoryManager{
+		{
+			description: "Successful hint generation",
+			policyName:  policyTypeStatic,
+			machineInfo: returnMachineInfo(),
+			reserved: systemReservedMemory{
+				0: map[v1.ResourceName]uint64{
+					v1.ResourceMemory: 1 * gb,
+				},
+				1: map[v1.ResourceName]uint64{
+					v1.ResourceMemory: 1 * gb,
+				},
+			},
+			assignments: state.ContainerMemoryAssignments{
+				"fakePod1": map[string][]state.Block{
+					"fakeContainer1": {
+						{
+							NUMAAffinity: []int{0},
+							Type:         v1.ResourceMemory,
+							Size:         1 * gb,
+						},
+						{
+							NUMAAffinity: []int{0},
+							Type:         hugepages1Gi,
+							Size:         1 * gb,
+						},
+					},
+					"fakeContainer2": {
+						{
+							NUMAAffinity: []int{0},
+							Type:         v1.ResourceMemory,
+							Size:         1 * gb,
+						},
+						{
+							NUMAAffinity: []int{0},
+							Type:         hugepages1Gi,
+							Size:         1 * gb,
+						},
+					},
+				},
+			},
+			machineState: state.NUMANodeMap{
+				0: &state.NUMANodeState{
+					Cells:               []int{0},
+					NumberOfAssignments: 4,
+					MemoryMap: map[v1.ResourceName]*state.MemoryTable{
+						v1.ResourceMemory: {
+							Allocatable:    9 * gb,
+							Free:           7 * gb,
+							Reserved:       2 * gb,
+							SystemReserved: 1 * gb,
+							TotalMemSize:   10 * gb,
+						},
+						hugepages1Gi: {
+							Allocatable:    5 * gb,
+							Free:           3 * gb,
+							Reserved:       2 * gb,
+							SystemReserved: 0 * gb,
+							TotalMemSize:   5 * gb,
+						},
+					},
+				},
+				1: &state.NUMANodeState{
+					Cells:               []int{1},
+					NumberOfAssignments: 0,
+					MemoryMap: map[v1.ResourceName]*state.MemoryTable{
+						v1.ResourceMemory: {
+							Allocatable:    9 * gb,
+							Free:           9 * gb,
+							Reserved:       0 * gb,
+							SystemReserved: 1 * gb,
+							TotalMemSize:   10 * gb,
+						},
+						hugepages1Gi: {
+							Allocatable:    5 * gb,
+							Free:           5 * gb,
+							Reserved:       0,
+							SystemReserved: 0,
+							TotalMemSize:   5 * gb,
+						},
+					},
+				},
+			},
+			expectedError: nil,
+			expectedHints: map[string][]topologymanager.TopologyHint{
+				string(v1.ResourceMemory): {
+					{
+						NUMANodeAffinity: newNUMAAffinity(0),
+						Preferred:        true,
+					},
+					{
+						NUMANodeAffinity: newNUMAAffinity(1),
+						Preferred:        true,
+					},
+				},
+				string(hugepages1Gi): {
+					{
+						NUMANodeAffinity: newNUMAAffinity(0),
+						Preferred:        true,
+					},
+					{
+						NUMANodeAffinity: newNUMAAffinity(1),
+						Preferred:        true,
+					},
+				},
+			},
+			activePods: []*v1.Pod{
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						UID: "fakePod1",
+					},
+					Spec: v1.PodSpec{
+						Containers: []v1.Container{
+							{
+								Name: "fakeContainer1",
+							},
+							{
+								Name: "fakeContainer2",
+							},
+						},
+					},
+				},
+			},
+		},
 		{
 			description: "Successful hint generation",
 			policyName:  policyTypeStatic,
@@ -2132,6 +2255,7 @@ func TestGetTopologyHints(t *testing.T) {
 					},
 				},
 			},
+			activePods: []*v1.Pod{},
 		},
 	}
 
@@ -2144,14 +2268,14 @@ func TestGetTopologyHints(t *testing.T) {
 				containerRuntime: mockRuntimeService{
 					err: nil,
 				},
-				activePods:        func() []*v1.Pod { return nil },
+				activePods:        func() []*v1.Pod { return testCase.activePods },
 				podStatusProvider: mockPodStatusProvider{},
 			}
 			mgr.sourcesReady = &sourcesReadyStub{}
 			mgr.state.SetMachineState(testCase.machineState.Clone())
 			mgr.state.SetMemoryAssignments(testCase.assignments.Clone())
 
-			pod := getPod("fakePod1", "fakeContainer1", requirementsGuaranteed)
+			pod := getPod("fakePod2", "fakeContainer1", requirementsGuaranteed)
 			container := &pod.Spec.Containers[0]
 			hints := mgr.GetTopologyHints(pod, container)
 			if !reflect.DeepEqual(hints, testCase.expectedHints) {