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82 lines
3.2 KiB
Go
82 lines
3.2 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/resource"
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)
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// For each of these resources, a container that doesn't request the resource explicitly
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// will be treated as having requested the amount indicated below, for the purpose
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// of computing priority only. This ensures that when scheduling zero-request pods, such
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// pods will not all be scheduled to the node with the smallest in-use request,
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// and that when scheduling regular pods, such pods will not see zero-request pods as
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// consuming no resources whatsoever. We chose these values to be similar to the
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// resources that we give to cluster addon pods (#10653). But they are pretty arbitrary.
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// As described in #11713, we use request instead of limit to deal with resource requirements.
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const (
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// DefaultMilliCPURequest defines default milli cpu request number.
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DefaultMilliCPURequest int64 = 100 // 0.1 core
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// DefaultMemoryRequest defines default memory request size.
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DefaultMemoryRequest int64 = 200 * 1024 * 1024 // 200 MB
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)
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// GetNonzeroRequests returns the default cpu in milli-cpu and memory in bytes resource requests if none is found or
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// what is provided on the request.
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func GetNonzeroRequests(requests *v1.ResourceList) (int64, int64) {
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cpu := GetRequestForResource(v1.ResourceCPU, requests, true)
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mem := GetRequestForResource(v1.ResourceMemory, requests, true)
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return cpu.MilliValue(), mem.Value()
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}
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// GetRequestForResource returns the requested values unless nonZero is true and there is no defined request
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// for CPU and memory.
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// If nonZero is true and the resource has no defined request for CPU or memory, it returns a default value.
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func GetRequestForResource(resourceName v1.ResourceName, requests *v1.ResourceList, nonZero bool) resource.Quantity {
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if requests == nil {
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return resource.Quantity{}
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}
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switch resourceName {
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case v1.ResourceCPU:
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// Override if un-set, but not if explicitly set to zero
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if _, found := (*requests)[v1.ResourceCPU]; !found && nonZero {
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return *resource.NewMilliQuantity(DefaultMilliCPURequest, resource.DecimalSI)
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}
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return requests.Cpu().DeepCopy()
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case v1.ResourceMemory:
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// Override if un-set, but not if explicitly set to zero
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if _, found := (*requests)[v1.ResourceMemory]; !found && nonZero {
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return *resource.NewQuantity(DefaultMemoryRequest, resource.DecimalSI)
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}
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return requests.Memory().DeepCopy()
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case v1.ResourceEphemeralStorage:
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quantity, found := (*requests)[v1.ResourceEphemeralStorage]
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if !found {
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return resource.Quantity{}
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}
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return quantity.DeepCopy()
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default:
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quantity, found := (*requests)[resourceName]
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if !found {
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return resource.Quantity{}
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}
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return quantity.DeepCopy()
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}
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}
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