k8s.io/kubernetes@v1.29.3/pkg/kubelet/cm/cpumanager/policy_none.go (about)

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package cpumanager
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"k8s.io/api/core/v1"
    23  	"k8s.io/klog/v2"
    24  	"k8s.io/kubernetes/pkg/kubelet/cm/cpumanager/state"
    25  	"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager"
    26  	"k8s.io/utils/cpuset"
    27  )
    28  
    29  type nonePolicy struct{}
    30  
    31  var _ Policy = &nonePolicy{}
    32  
    33  // PolicyNone name of none policy
    34  const PolicyNone policyName = "none"
    35  
    36  // NewNonePolicy returns a cpuset manager policy that does nothing
    37  func NewNonePolicy(cpuPolicyOptions map[string]string) (Policy, error) {
    38  	if len(cpuPolicyOptions) > 0 {
    39  		return nil, fmt.Errorf("None policy: received unsupported options=%v", cpuPolicyOptions)
    40  	}
    41  	return &nonePolicy{}, nil
    42  }
    43  
    44  func (p *nonePolicy) Name() string {
    45  	return string(PolicyNone)
    46  }
    47  
    48  func (p *nonePolicy) Start(s state.State) error {
    49  	klog.InfoS("None policy: Start")
    50  	return nil
    51  }
    52  
    53  func (p *nonePolicy) Allocate(s state.State, pod *v1.Pod, container *v1.Container) error {
    54  	return nil
    55  }
    56  
    57  func (p *nonePolicy) RemoveContainer(s state.State, podUID string, containerName string) error {
    58  	return nil
    59  }
    60  
    61  func (p *nonePolicy) GetTopologyHints(s state.State, pod *v1.Pod, container *v1.Container) map[string][]topologymanager.TopologyHint {
    62  	return nil
    63  }
    64  
    65  func (p *nonePolicy) GetPodTopologyHints(s state.State, pod *v1.Pod) map[string][]topologymanager.TopologyHint {
    66  	return nil
    67  }
    68  
    69  // Assignable CPUs are the ones that can be exclusively allocated to pods that meet the exclusivity requirement
    70  // (ie guaranteed QoS class and integral CPU request).
    71  // Assignability of CPUs as a concept is only applicable in case of static policy i.e. scenarios where workloads
    72  // CAN get exclusive access to core(s).
    73  // Hence, we return empty set here: no cpus are assignable according to above definition with this policy.
    74  func (p *nonePolicy) GetAllocatableCPUs(m state.State) cpuset.CPUSet {
    75  	return cpuset.New()
    76  }