memory manager: add the policy interface

The commit also adds two policy skeletons:
- none
- static

Signed-off-by: Artyom Lukianov <alukiano@redhat.com>
This commit is contained in:
Artyom Lukianov 2020-10-08 17:10:26 +03:00
parent 86df524948
commit d0caec90e2
3 changed files with 172 additions and 0 deletions

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/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package memorymanager
import (
v1 "k8s.io/api/core/v1"
"k8s.io/kubernetes/pkg/kubelet/cm/memorymanager/state"
"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
)
// Type defines the policy type
type policyType string
// Policy implements logic for pod container to a memory assignment.
type Policy interface {
Name() string
Start(s state.State) 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
// and is consulted to achieve NUMA aware resource alignment among this
// and other resource controllers.
GetTopologyHints(s state.State, pod *v1.Pod, container *v1.Container) map[string][]topologymanager.TopologyHint
}

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/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package memorymanager
import (
v1 "k8s.io/api/core/v1"
"k8s.io/kubernetes/pkg/kubelet/cm/memorymanager/state"
"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
)
const policyTypeNone policyType = "none"
// none is implementation of the policy interface for the none policy, using none
// policy is the same as disable memory management
type none struct{}
var _ Policy = &none{}
// NewPolicyNone returns new none policy instance
func NewPolicyNone() Policy {
return &none{}
}
func (p *none) Name() string {
return string(policyTypeNone)
}
func (p *none) Start(s state.State) error {
return nil
}
// Allocate call is idempotent
func (p *none) Allocate(s state.State, pod *v1.Pod, container *v1.Container) error {
return nil
}
// RemoveContainer call is idempotent
func (p *none) RemoveContainer(s state.State, podUID string, containerName string) error {
return nil
}
// GetTopologyHints implements the topologymanager.HintProvider Interface
// and is consulted to achieve NUMA aware resource alignment among this
// and other resource controllers.
func (p *none) GetTopologyHints(s state.State, pod *v1.Pod, container *v1.Container) map[string][]topologymanager.TopologyHint {
return nil
}

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/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package memorymanager
import (
cadvisorapi "github.com/google/cadvisor/info/v1"
v1 "k8s.io/api/core/v1"
"k8s.io/kubernetes/pkg/kubelet/cm/memorymanager/state"
"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
)
const policyTypeStatic policyType = "static"
type systemReservedMemory map[int]map[v1.ResourceName]uint64
// staticPolicy is implementation of the policy interface for the single NUMA policy
type staticPolicy struct {
// machineInfo contains machine memory related information
machineInfo *cadvisorapi.MachineInfo
// reserved contains memory that reserved for kube
systemReserved systemReservedMemory
// topology manager reference to get container Topology affinity
affinity topologymanager.Store
}
var _ Policy = &staticPolicy{}
// NewPolicyStatic returns new single NUMA policy instance
func NewPolicyStatic() Policy {
return &staticPolicy{}
}
func (p *staticPolicy) Name() string {
return string(policyTypeStatic)
}
func (p *staticPolicy) Start(s state.State) error {
return nil
}
// Allocate call is idempotent
func (p *staticPolicy) Allocate(s state.State, pod *v1.Pod, container *v1.Container) error {
return nil
}
// RemoveContainer call is idempotent
func (p *staticPolicy) RemoveContainer(s state.State, podUID string, containerName string) error {
return nil
}
// GetTopologyHints implements the topologymanager.HintProvider Interface
// and is consulted to achieve NUMA aware resource alignment among this
// and other resource controllers.
func (p *staticPolicy) GetTopologyHints(s state.State, pod *v1.Pod, container *v1.Container) map[string][]topologymanager.TopologyHint {
return nil
}