state_mem.go

Documentation: k8s.io/kubernetes/pkg/kubelet/cm/memorymanager/state

     1  /*
     2  Copyright 2020 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 state
    18  
    19  import (
    20  	"sync"
    21  
    22  	"k8s.io/klog/v2"
    23  )
    24  
    25  type stateMemory struct {
    26  	sync.RWMutex
    27  	assignments  ContainerMemoryAssignments
    28  	machineState NUMANodeMap
    29  }
    30  
    31  var _ State = &stateMemory{}
    32  
    33  // NewMemoryState creates new State for keeping track of cpu/pod assignment
    34  func NewMemoryState() State {
    35  	klog.InfoS("Initializing new in-memory state store")
    36  	return &stateMemory{
    37  		assignments:  ContainerMemoryAssignments{},
    38  		machineState: NUMANodeMap{},
    39  	}
    40  }
    41  
    42  // GetMemoryState returns Memory Map stored in the State
    43  func (s *stateMemory) GetMachineState() NUMANodeMap {
    44  	s.RLock()
    45  	defer s.RUnlock()
    46  
    47  	return s.machineState.Clone()
    48  }
    49  
    50  // GetMemoryBlocks returns memory assignments of a container
    51  func (s *stateMemory) GetMemoryBlocks(podUID string, containerName string) []Block {
    52  	s.RLock()
    53  	defer s.RUnlock()
    54  
    55  	if res, ok := s.assignments[podUID][containerName]; ok {
    56  		return append([]Block{}, res...)
    57  	}
    58  	return nil
    59  }
    60  
    61  // GetMemoryAssignments returns ContainerMemoryAssignments
    62  func (s *stateMemory) GetMemoryAssignments() ContainerMemoryAssignments {
    63  	s.RLock()
    64  	defer s.RUnlock()
    65  
    66  	return s.assignments.Clone()
    67  }
    68  
    69  // SetMachineState stores NUMANodeMap in State
    70  func (s *stateMemory) SetMachineState(nodeMap NUMANodeMap) {
    71  	s.Lock()
    72  	defer s.Unlock()
    73  
    74  	s.machineState = nodeMap.Clone()
    75  	klog.InfoS("Updated machine memory state")
    76  }
    77  
    78  // SetMemoryBlocks stores memory assignments of container
    79  func (s *stateMemory) SetMemoryBlocks(podUID string, containerName string, blocks []Block) {
    80  	s.Lock()
    81  	defer s.Unlock()
    82  
    83  	if _, ok := s.assignments[podUID]; !ok {
    84  		s.assignments[podUID] = map[string][]Block{}
    85  	}
    86  
    87  	s.assignments[podUID][containerName] = append([]Block{}, blocks...)
    88  	klog.InfoS("Updated memory state", "podUID", podUID, "containerName", containerName)
    89  }
    90  
    91  // SetMemoryAssignments sets ContainerMemoryAssignments by using the passed parameter
    92  func (s *stateMemory) SetMemoryAssignments(assignments ContainerMemoryAssignments) {
    93  	s.Lock()
    94  	defer s.Unlock()
    95  
    96  	s.assignments = assignments.Clone()
    97  }
    98  
    99  // Delete deletes corresponding Blocks from ContainerMemoryAssignments
   100  func (s *stateMemory) Delete(podUID string, containerName string) {
   101  	s.Lock()
   102  	defer s.Unlock()
   103  
   104  	if _, ok := s.assignments[podUID]; !ok {
   105  		return
   106  	}
   107  
   108  	delete(s.assignments[podUID], containerName)
   109  	if len(s.assignments[podUID]) == 0 {
   110  		delete(s.assignments, podUID)
   111  	}
   112  	klog.V(2).InfoS("Deleted memory assignment", "podUID", podUID, "containerName", containerName)
   113  }
   114  
   115  // ClearState clears machineState and ContainerMemoryAssignments
   116  func (s *stateMemory) ClearState() {
   117  	s.Lock()
   118  	defer s.Unlock()
   119  
   120  	s.machineState = NUMANodeMap{}
   121  	s.assignments = make(ContainerMemoryAssignments)
   122  	klog.V(2).InfoS("Cleared state")
   123  }
   124
View as plain text