Guarantee aligned resources across containers

pkg/kubelet/cm/container_manager.go

@@ -25,7 +25,6 @@ import (
 	internalapi "k8s.io/cri-api/pkg/apis"
 	podresourcesapi "k8s.io/kubernetes/pkg/kubelet/apis/podresources/v1alpha1"
 	"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
-	"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
 	"k8s.io/kubernetes/pkg/kubelet/config"
 	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
 	evictionapi "k8s.io/kubernetes/pkg/kubelet/eviction/api"
@@ -111,8 +110,8 @@ type ContainerManager interface {
 	// due to node recreation.
 	ShouldResetExtendedResourceCapacity() bool
 
-	// GetTopologyPodAdmitHandler returns an instance of the TopologyManager for Pod Admission
-	GetTopologyPodAdmitHandler() topologymanager.Manager
+	// GetAllocateResourcesPodAdmitHandler returns an instance of a PodAdmitHandler responsible for allocating pod resources.
+	GetAllocateResourcesPodAdmitHandler() lifecycle.PodAdmitHandler
 
 	// UpdateAllocatedDevices frees any Devices that are bound to terminated pods.
 	UpdateAllocatedDevices()

pkg/kubelet/cm/container_manager_linux.go

@@ -672,11 +672,51 @@ func (cm *containerManagerImpl) GetResources(pod *v1.Pod, container *v1.Containe
 }
 
 func (cm *containerManagerImpl) UpdatePluginResources(node *schedulernodeinfo.NodeInfo, attrs *lifecycle.PodAdmitAttributes) error {
-	return cm.deviceManager.Allocate(node, attrs)
+	return cm.deviceManager.UpdatePluginResources(node, attrs)
 }
 
-func (cm *containerManagerImpl) GetTopologyPodAdmitHandler() topologymanager.Manager {
-	return cm.topologyManager
+func (cm *containerManagerImpl) GetAllocateResourcesPodAdmitHandler() lifecycle.PodAdmitHandler {
+	if utilfeature.DefaultFeatureGate.Enabled(kubefeatures.TopologyManager) {
+		return cm.topologyManager
+	}
+	// TODO: we need to think about a better way to do this. This will work for
+	// now so long as we have only the cpuManager and deviceManager relying on
+	// allocations here. However, going forward it is not generalized enough to
+	// work as we add more and more hint providers that the TopologyManager
+	// needs to call Allocate() on (that may not be directly intstantiated
+	// inside this component).
+	return &resourceAllocator{cm.cpuManager, cm.deviceManager}
+}
+
+type resourceAllocator struct {
+	cpuManager    cpumanager.Manager
+	deviceManager devicemanager.Manager
+}
+
+func (m *resourceAllocator) Admit(attrs *lifecycle.PodAdmitAttributes) lifecycle.PodAdmitResult {
+	pod := attrs.Pod
+
+	for _, container := range append(pod.Spec.InitContainers, pod.Spec.Containers...) {
+		err := m.deviceManager.Allocate(pod, &container)
+		if err != nil {
+			return lifecycle.PodAdmitResult{
+				Message: fmt.Sprintf("Allocate failed due to %v, which is unexpected", err),
+				Reason:  "UnexpectedAdmissionError",
+				Admit:   false,
+			}
+		}
+
+		err = m.cpuManager.Allocate(pod, &container)
+		if err != nil {
+			return lifecycle.PodAdmitResult{
+				Message: fmt.Sprintf("Allocate failed due to %v, which is unexpected", err),
+				Reason:  "UnexpectedAdmissionError",
+				Admit:   false,
+			}
+		}
+	}
+
+	return lifecycle.PodAdmitResult{Admit: true}
 }
 
 func (cm *containerManagerImpl) SystemCgroupsLimit() v1.ResourceList {

pkg/kubelet/cm/container_manager_stub.go

@@ -117,8 +117,8 @@ func (cm *containerManagerStub) ShouldResetExtendedResourceCapacity() bool {
 	return cm.shouldResetExtendedResourceCapacity
 }
 
-func (cm *containerManagerStub) GetTopologyPodAdmitHandler() topologymanager.Manager {
-	return nil
+func (cm *containerManagerStub) GetAllocateResourcesPodAdmitHandler() lifecycle.PodAdmitHandler {
+	return topologymanager.NewFakeManager()
 }
 
 func (cm *containerManagerStub) UpdateAllocatedDevices() {

pkg/kubelet/cm/container_manager_windows.go

@@ -178,7 +178,7 @@ func (cm *containerManagerImpl) ShouldResetExtendedResourceCapacity() bool {
 	return false
 }
 
-func (cm *containerManagerImpl) GetTopologyPodAdmitHandler() topologymanager.Manager {
+func (cm *containerManagerImpl) GetAllocateResourcesPodAdmitHandler() lifecycle.PodAdmitHandler {
 	return nil
 }
 

pkg/kubelet/cm/cpumanager/cpu_manager.go

@@ -55,6 +55,11 @@ type Manager interface {
 	// Start is called during Kubelet initialization.
 	Start(activePods ActivePodsFunc, sourcesReady config.SourcesReady, podStatusProvider status.PodStatusProvider, containerRuntime runtimeService, initialContainers containermap.ContainerMap) error
 
+	// Called to trigger the allocation of CPUs to a container. This must be
+	// called at some point prior to the AddContainer() call for a container,
+	// e.g. at pod admission time.
+	Allocate(pod *v1.Pod, container *v1.Container) error
+
 	// AddContainer is called between container create and container start
 	// so that initial CPU affinity settings can be written through to the
 	// container runtime before the first process begins to execute.
@@ -206,46 +211,41 @@ func (m *manager) Start(activePods ActivePodsFunc, sourcesReady config.SourcesRe
 	return nil
 }
 
-func (m *manager) AddContainer(p *v1.Pod, c *v1.Container, containerID string) error {
+func (m *manager) Allocate(p *v1.Pod, c *v1.Container) error {
 	m.Lock()
-	// Proactively remove CPUs from init containers that have already run.
-	// They are guaranteed to have run to completion before any other
-	// container is run.
-	for _, initContainer := range p.Spec.InitContainers {
-		if c.Name != initContainer.Name {
-			err := m.policyRemoveContainerByRef(string(p.UID), initContainer.Name)
-			if err != nil {
-				klog.Warningf("[cpumanager] unable to remove init container (pod: %s, container: %s, error: %v)", string(p.UID), initContainer.Name, err)
-			}
-		}
-	}
+	defer m.Unlock()
 
 	// Call down into the policy to assign this container CPUs if required.
-	err := m.policyAddContainer(p, c, containerID)
+	err := m.policy.Allocate(m.state, p, c)
 	if err != nil {
-		klog.Errorf("[cpumanager] AddContainer error: %v", err)
-		m.Unlock()
+		klog.Errorf("[cpumanager] Allocate error: %v", err)
 		return err
 	}
 
-	// Get the CPUs just assigned to the container (or fall back to the default
-	// CPUSet if none were assigned).
+	return nil
+}
+
+func (m *manager) AddContainer(p *v1.Pod, c *v1.Container, containerID string) error {
+	m.Lock()
+	// Get the CPUs assigned to the container during Allocate()
+	// (or fall back to the default CPUSet if none were assigned).
 	cpus := m.state.GetCPUSetOrDefault(string(p.UID), c.Name)
 	m.Unlock()
 
 	if !cpus.IsEmpty() {
-		err = m.updateContainerCPUSet(containerID, cpus)
+		err := m.updateContainerCPUSet(containerID, cpus)
 		if err != nil {
 			klog.Errorf("[cpumanager] AddContainer error: error updating CPUSet for container (pod: %s, container: %s, container id: %s, err: %v)", p.Name, c.Name, containerID, err)
 			m.Lock()
-			err := m.policyRemoveContainerByID(containerID)
+			err := m.policyRemoveContainerByRef(string(p.UID), c.Name)
 			if err != nil {
 				klog.Errorf("[cpumanager] AddContainer rollback state error: %v", err)
 			}
 			m.Unlock()
 		}
 		return err
 	}
+
 	klog.V(5).Infof("[cpumanager] update container resources is skipped due to cpu set is empty")
 	return nil
 }
@@ -263,14 +263,6 @@ func (m *manager) RemoveContainer(containerID string) error {
 	return nil
 }
 
-func (m *manager) policyAddContainer(p *v1.Pod, c *v1.Container, containerID string) error {
-	err := m.policy.AddContainer(m.state, p, c)
-	if err == nil {
-		m.containerMap.Add(string(p.UID), c.Name, containerID)
-	}
-	return err
-}
-
 func (m *manager) policyRemoveContainerByID(containerID string) error {
 	podUID, containerName, err := m.containerMap.GetContainerRef(containerID)
 	if err != nil {

pkg/kubelet/cm/cpumanager/cpu_manager_test.go

@@ -104,7 +104,7 @@ func (p *mockPolicy) Start(s state.State) error {
 	return p.err
 }
 
-func (p *mockPolicy) AddContainer(s state.State, pod *v1.Pod, container *v1.Container) error {
+func (p *mockPolicy) Allocate(s state.State, pod *v1.Pod, container *v1.Container) error {
 	return p.err
 }
 
@@ -223,34 +223,38 @@ func TestCPUManagerAdd(t *testing.T) {
 		cpuset.NewCPUSet(),
 		topologymanager.NewFakeManager())
 	testCases := []struct {
-		description string
-		updateErr   error
-		policy      Policy
-		expCPUSet   cpuset.CPUSet
-		expErr      error
+		description        string
+		updateErr          error
+		policy             Policy
+		expCPUSet          cpuset.CPUSet
+		expAllocateErr     error
+		expAddContainerErr error
 	}{
 		{
-			description: "cpu manager add - no error",
-			updateErr:   nil,
-			policy:      testPolicy,
-			expCPUSet:   cpuset.NewCPUSet(3, 4),
-			expErr:      nil,
+			description:        "cpu manager add - no error",
+			updateErr:          nil,
+			policy:             testPolicy,
+			expCPUSet:          cpuset.NewCPUSet(3, 4),
+			expAllocateErr:     nil,
+			expAddContainerErr: nil,
 		},
 		{
 			description: "cpu manager add - policy add container error",
 			updateErr:   nil,
 			policy: &mockPolicy{
 				err: fmt.Errorf("fake reg error"),
 			},
-			expCPUSet: cpuset.NewCPUSet(1, 2, 3, 4),
-			expErr:    fmt.Errorf("fake reg error"),
+			expCPUSet:          cpuset.NewCPUSet(1, 2, 3, 4),
+			expAllocateErr:     fmt.Errorf("fake reg error"),
+			expAddContainerErr: nil,
 		},
 		{
-			description: "cpu manager add - container update error",
-			updateErr:   fmt.Errorf("fake update error"),
-			policy:      testPolicy,
-			expCPUSet:   cpuset.NewCPUSet(1, 2, 3, 4),
-			expErr:      fmt.Errorf("fake update error"),
+			description:        "cpu manager add - container update error",
+			updateErr:          fmt.Errorf("fake update error"),
+			policy:             testPolicy,
+			expCPUSet:          cpuset.NewCPUSet(1, 2, 3, 4),
+			expAllocateErr:     nil,
+			expAddContainerErr: fmt.Errorf("fake update error"),
 		},
 	}
 
@@ -271,10 +275,16 @@ func TestCPUManagerAdd(t *testing.T) {
 
 		pod := makePod("fakePod", "fakeContainer", "2", "2")
 		container := &pod.Spec.Containers[0]
-		err := mgr.AddContainer(pod, container, "fakeID")
-		if !reflect.DeepEqual(err, testCase.expErr) {
+		err := mgr.Allocate(pod, container)
+		if !reflect.DeepEqual(err, testCase.expAllocateErr) {
+			t.Errorf("CPU Manager Allocate() error (%v). expected error: %v but got: %v",
+				testCase.description, testCase.expAllocateErr, err)
+		}
+
+		err = mgr.AddContainer(pod, container, "fakeID")
+		if !reflect.DeepEqual(err, testCase.expAddContainerErr) {
 			t.Errorf("CPU Manager AddContainer() error (%v). expected error: %v but got: %v",
-				testCase.description, testCase.expErr, err)
+				testCase.description, testCase.expAddContainerErr, err)
 		}
 		if !testCase.expCPUSet.Equals(mgr.state.GetDefaultCPUSet()) {
 			t.Errorf("CPU Manager AddContainer() error (%v). expected cpuset: %v but got: %v",
@@ -494,7 +504,12 @@ func TestCPUManagerAddWithInitContainers(t *testing.T) {
 			testCase.expCSets...)
 
 		for i := range containers {
-			err := mgr.AddContainer(testCase.pod, &containers[i], containerIDs[i])
+			err := mgr.Allocate(testCase.pod, &containers[i])
+			if err != nil {
+				t.Errorf("StaticPolicy Allocate() error (%v). unexpected error for container id: %v: %v",
+					testCase.description, containerIDs[i], err)
+			}
+			err = mgr.AddContainer(testCase.pod, &containers[i], containerIDs[i])
 			if err != nil {
 				t.Errorf("StaticPolicy AddContainer() error (%v). unexpected error for container id: %v: %v",
 					testCase.description, containerIDs[i], err)
@@ -970,25 +985,28 @@ func TestCPUManagerAddWithResvList(t *testing.T) {
 		cpuset.NewCPUSet(0),
 		topologymanager.NewFakeManager())
 	testCases := []struct {
-		description string
-		updateErr   error
-		policy      Policy
-		expCPUSet   cpuset.CPUSet
-		expErr      error
+		description        string
+		updateErr          error
+		policy             Policy
+		expCPUSet          cpuset.CPUSet
+		expAllocateErr     error
+		expAddContainerErr error
 	}{
 		{
-			description: "cpu manager add - no error",
-			updateErr:   nil,
-			policy:      testPolicy,
-			expCPUSet:   cpuset.NewCPUSet(0, 3),
-			expErr:      nil,
+			description:        "cpu manager add - no error",
+			updateErr:          nil,
+			policy:             testPolicy,
+			expCPUSet:          cpuset.NewCPUSet(0, 3),
+			expAllocateErr:     nil,
+			expAddContainerErr: nil,
 		},
 		{
-			description: "cpu manager add - container update error",
-			updateErr:   fmt.Errorf("fake update error"),
-			policy:      testPolicy,
-			expCPUSet:   cpuset.NewCPUSet(0, 1, 2, 3),
-			expErr:      fmt.Errorf("fake update error"),
+			description:        "cpu manager add - container update error",
+			updateErr:          fmt.Errorf("fake update error"),
+			policy:             testPolicy,
+			expCPUSet:          cpuset.NewCPUSet(0, 1, 2, 3),
+			expAllocateErr:     nil,
+			expAddContainerErr: fmt.Errorf("fake update error"),
 		},
 	}
 
@@ -1009,10 +1027,16 @@ func TestCPUManagerAddWithResvList(t *testing.T) {
 
 		pod := makePod("fakePod", "fakeContainer", "2", "2")
 		container := &pod.Spec.Containers[0]
-		err := mgr.AddContainer(pod, container, "fakeID")
-		if !reflect.DeepEqual(err, testCase.expErr) {
+		err := mgr.Allocate(pod, container)
+		if !reflect.DeepEqual(err, testCase.expAllocateErr) {
+			t.Errorf("CPU Manager Allocate() error (%v). expected error: %v but got: %v",
+				testCase.description, testCase.expAllocateErr, err)
+		}
+
+		err = mgr.AddContainer(pod, container, "fakeID")
+		if !reflect.DeepEqual(err, testCase.expAddContainerErr) {
 			t.Errorf("CPU Manager AddContainer() error (%v). expected error: %v but got: %v",
-				testCase.description, testCase.expErr, err)
+				testCase.description, testCase.expAddContainerErr, err)
 		}
 		if !testCase.expCPUSet.Equals(mgr.state.GetDefaultCPUSet()) {
 			t.Errorf("CPU Manager AddContainer() error (%v). expected cpuset: %v but got: %v",

pkg/kubelet/cm/cpumanager/fake_cpu_manager.go

@@ -40,6 +40,11 @@ func (m *fakeManager) Policy() Policy {
 	return NewNonePolicy()
 }
 
+func (m *fakeManager) Allocate(pod *v1.Pod, container *v1.Container) error {
+	klog.Infof("[fake cpumanager] Allocate (pod: %s, container: %s", pod.Name, container.Name)
+	return nil
+}
+
 func (m *fakeManager) AddContainer(pod *v1.Pod, container *v1.Container, containerID string) error {
 	klog.Infof("[fake cpumanager] AddContainer (pod: %s, container: %s, container id: %s)", pod.Name, container.Name, containerID)
 	return nil

pkg/kubelet/cm/cpumanager/policy.go

@@ -26,8 +26,8 @@ import (
 type Policy interface {
 	Name() string
 	Start(s state.State) error
-	// AddContainer call is idempotent
-	AddContainer(s state.State, pod *v1.Pod, container *v1.Container) error
+	// Allocate call is idempotent
+	Allocate(s state.State, pod *v1.Pod, container *v1.Container) error
 	// RemoveContainer call is idempotent
 	RemoveContainer(s state.State, podUID string, containerName string) error
 	// GetTopologyHints implements the topologymanager.HintProvider Interface

pkg/kubelet/cm/cpumanager/policy_none.go

@@ -44,7 +44,7 @@ func (p *nonePolicy) Start(s state.State) error {
 	return nil
 }
 
-func (p *nonePolicy) AddContainer(s state.State, pod *v1.Pod, container *v1.Container) error {
+func (p *nonePolicy) Allocate(s state.State, pod *v1.Pod, container *v1.Container) error {
 	return nil
 }
 

pkg/kubelet/cm/cpumanager/policy_none_test.go

@@ -33,7 +33,7 @@ func TestNonePolicyName(t *testing.T) {
 	}
 }
 
-func TestNonePolicyAdd(t *testing.T) {
+func TestNonePolicyAllocate(t *testing.T) {
 	policy := &nonePolicy{}
 
 	st := &mockState{
@@ -44,9 +44,9 @@ func TestNonePolicyAdd(t *testing.T) {
 	testPod := makePod("fakePod", "fakeContainer", "1000m", "1000m")
 
 	container := &testPod.Spec.Containers[0]
-	err := policy.AddContainer(st, testPod, container)
+	err := policy.Allocate(st, testPod, container)
 	if err != nil {
-		t.Errorf("NonePolicy AddContainer() error. expected no error but got: %v", err)
+		t.Errorf("NonePolicy Allocate() error. expected no error but got: %v", err)
 	}
 }