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node: topologymgr: Remove ResourceAllocator as TM is always enabled

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With Topology Manager enabled by default, we no longer need
`resourceAllocator` as Topology Manager serves as the main
PodAdmitHandler completely responsible for admission check
based on hints received from the hintProviders and the
subsequent allocation of the corresponding resources to a
pod as can be seen here:
https://github.com/kubernetes/kubernetes/blob/v1.26.0/pkg/kubelet/cm/topologymanager/scope.go#L150

With regard to DRA, the passing of `cm.draManager` into
resourceAllocator seems redundant as no admission checks
(and allocation of resources handled by DRA) is taking place
in `Admit` method of resourceAllocator. DRA has a completely
different model to the rest of the resource managers where
pod is only scheduled on a node once resources are reserved
for it. Because of this, admission checks or waiting for
resources to be provisioned after the pod has been scheduled
on the node is not required.

Before making the above change, it was verified that DRA Manager
is instantiated in `NewContainerManager`:
https://github.com/kubernetes/kubernetes/blob/v1.26.0/pkg/kubelet/cm/container_manager_linux.go#L318

Signed-off-by: Swati Sehgal <swsehgal@redhat.com>
This commit is contained in:
Swati Sehgal 2023-03-03 11:34:34 +00:00
parent 6a62f0236a
commit 937d330393
1 changed files with 1 additions and 45 deletions
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46
pkg/kubelet/cm/container_manager_linux.go
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@ -51,7 +51,6 @@ import (
podresourcesapi "k8s.io/kubelet/pkg/apis/podresources/v1"
kubefeatures "k8s.io/kubernetes/pkg/features"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/cm/admission"
"k8s.io/kubernetes/pkg/kubelet/cm/containermap"
"k8s.io/kubernetes/pkg/kubelet/cm/cpumanager"
"k8s.io/kubernetes/pkg/kubelet/cm/devicemanager"
@ -682,50 +681,7 @@ func (cm *containerManagerImpl) UpdatePluginResources(node *schedulerframework.N
}
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.memoryManager, cm.deviceManager, cm.draManager}
}
type resourceAllocator struct {
cpuManager cpumanager.Manager
memoryManager memorymanager.Manager
deviceManager devicemanager.Manager
draManager dra.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 admission.GetPodAdmitResult(err)
}
if m.cpuManager != nil {
err = m.cpuManager.Allocate(pod, &container)
if err != nil {
return admission.GetPodAdmitResult(err)
}
}
if m.memoryManager != nil {
err = m.memoryManager.Allocate(pod, &container)
if err != nil {
return admission.GetPodAdmitResult(err)
}
}
}
return admission.GetPodAdmitResult(nil)
return cm.topologyManager
}
func (cm *containerManagerImpl) SystemCgroupsLimit() v1.ResourceList {