kuberuntime_sandbox_linux.go

Documentation: k8s.io/kubernetes/pkg/kubelet/kuberuntime

     1  //go:build linux
     2  // +build linux
     3  
     4  /*
     5  Copyright 2021 The Kubernetes Authors.
     6  
     7  Licensed under the Apache License, Version 2.0 (the "License");
     8  you may not use this file except in compliance with the License.
     9  You may obtain a copy of the License at
    10  
    11      http://www.apache.org/licenses/LICENSE-2.0
    12  
    13  Unless required by applicable law or agreed to in writing, software
    14  distributed under the License is distributed on an "AS IS" BASIS,
    15  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16  See the License for the specific language governing permissions and
    17  limitations under the License.
    18  */
    19  
    20  package kuberuntime
    21  
    22  import (
    23  	v1 "k8s.io/api/core/v1"
    24  	"k8s.io/apimachinery/pkg/api/resource"
    25  	runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
    26  
    27  	resourcehelper "k8s.io/kubernetes/pkg/api/v1/resource"
    28  )
    29  
    30  func (m *kubeGenericRuntimeManager) convertOverheadToLinuxResources(pod *v1.Pod) *runtimeapi.LinuxContainerResources {
    31  	resources := &runtimeapi.LinuxContainerResources{}
    32  	if pod.Spec.Overhead != nil {
    33  		cpu := pod.Spec.Overhead.Cpu()
    34  		memory := pod.Spec.Overhead.Memory()
    35  
    36  		// For overhead, we do not differentiate between requests and limits. Treat this overhead
    37  		// as "guaranteed", with requests == limits
    38  		resources = m.calculateLinuxResources(cpu, cpu, memory)
    39  	}
    40  
    41  	return resources
    42  }
    43  
    44  func (m *kubeGenericRuntimeManager) calculateSandboxResources(pod *v1.Pod) *runtimeapi.LinuxContainerResources {
    45  	opts := resourcehelper.PodResourcesOptions{
    46  		ExcludeOverhead: true,
    47  	}
    48  	req := resourcehelper.PodRequests(pod, opts)
    49  	lim := resourcehelper.PodLimits(pod, opts)
    50  	var cpuRequest *resource.Quantity
    51  	if _, cpuRequestExists := req[v1.ResourceCPU]; cpuRequestExists {
    52  		cpuRequest = req.Cpu()
    53  	}
    54  	return m.calculateLinuxResources(cpuRequest, lim.Cpu(), lim.Memory())
    55  }
    56  
    57  func (m *kubeGenericRuntimeManager) applySandboxResources(pod *v1.Pod, config *runtimeapi.PodSandboxConfig) error {
    58  
    59  	if config.Linux == nil {
    60  		return nil
    61  	}
    62  	config.Linux.Resources = m.calculateSandboxResources(pod)
    63  	config.Linux.Overhead = m.convertOverheadToLinuxResources(pod)
    64  
    65  	return nil
    66  }
    67
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