100 lines
3.3 KiB
Go
100 lines
3.3 KiB
Go
/*
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Copyright 2019 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 noderesources
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import (
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"context"
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"fmt"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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)
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// LeastAllocated is a score plugin that favors nodes with fewer allocation requested resources based on requested resources.
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type LeastAllocated struct {
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handle framework.FrameworkHandle
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resourceAllocationScorer
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}
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var _ = framework.ScorePlugin(&LeastAllocated{})
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// LeastAllocatedName is the name of the plugin used in the plugin registry and configurations.
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const LeastAllocatedName = "NodeResourcesLeastAllocated"
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// Name returns name of the plugin. It is used in logs, etc.
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func (la *LeastAllocated) Name() string {
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return LeastAllocatedName
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}
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// Score invoked at the score extension point.
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func (la *LeastAllocated) Score(ctx context.Context, state *framework.CycleState, pod *v1.Pod, nodeName string) (int64, *framework.Status) {
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nodeInfo, err := la.handle.SnapshotSharedLister().NodeInfos().Get(nodeName)
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if err != nil {
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return 0, framework.NewStatus(framework.Error, fmt.Sprintf("getting node %q from Snapshot: %v", nodeName, err))
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}
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// la.score favors nodes with fewer requested resources.
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// It calculates the percentage of memory and CPU requested by pods scheduled on the node, and
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// prioritizes based on the minimum of the average of the fraction of requested to capacity.
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//
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// Details:
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// (cpu((capacity-sum(requested))*10/capacity) + memory((capacity-sum(requested))*10/capacity))/2
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return la.score(pod, nodeInfo)
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}
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// ScoreExtensions of the Score plugin.
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func (la *LeastAllocated) ScoreExtensions() framework.ScoreExtensions {
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return nil
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}
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// NewLeastAllocated initializes a new plugin and returns it.
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func NewLeastAllocated(_ *runtime.Unknown, h framework.FrameworkHandle) (framework.Plugin, error) {
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return &LeastAllocated{
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handle: h,
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resourceAllocationScorer: resourceAllocationScorer{
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LeastAllocatedName,
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leastResourceScorer,
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defaultRequestedRatioResources,
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},
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}, nil
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}
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func leastResourceScorer(requested, allocable resourceToValueMap, includeVolumes bool, requestedVolumes int, allocatableVolumes int) int64 {
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var nodeScore, weightSum int64
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for resource, weight := range defaultRequestedRatioResources {
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resourceScore := leastRequestedScore(requested[resource], allocable[resource])
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nodeScore += resourceScore * weight
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weightSum += weight
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}
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return nodeScore / weightSum
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}
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// The unused capacity is calculated on a scale of 0-10
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// 0 being the lowest priority and 10 being the highest.
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// The more unused resources the higher the score is.
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func leastRequestedScore(requested, capacity int64) int64 {
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if capacity == 0 {
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return 0
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}
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if requested > capacity {
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return 0
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}
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return ((capacity - requested) * int64(framework.MaxNodeScore)) / capacity
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}
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