mirror of
https://github.com/k3s-io/kubernetes.git
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100 lines
3.6 KiB
Go
100 lines
3.6 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 priorities
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import (
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"fmt"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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v1helper "k8s.io/kubernetes/pkg/api/v1/helper"
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schedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api"
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"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
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)
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// CountIntolerableTaintsPreferNoSchedule gives the count of intolerable taints of a pod with effect PreferNoSchedule
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func countIntolerableTaintsPreferNoSchedule(taints []v1.Taint, tolerations []v1.Toleration) (intolerableTaints int) {
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for _, taint := range taints {
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// check only on taints that have effect PreferNoSchedule
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if taint.Effect != v1.TaintEffectPreferNoSchedule {
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continue
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}
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if !v1helper.TolerationsTolerateTaint(tolerations, &taint) {
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intolerableTaints++
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}
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}
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return
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}
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// getAllTolerationEffectPreferNoSchedule gets the list of all Tolerations with Effect PreferNoSchedule or with no effect.
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func getAllTolerationPreferNoSchedule(tolerations []v1.Toleration) (tolerationList []v1.Toleration) {
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for _, toleration := range tolerations {
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// Empty effect means all effects which includes PreferNoSchedule, so we need to collect it as well.
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if len(toleration.Effect) == 0 || toleration.Effect == v1.TaintEffectPreferNoSchedule {
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tolerationList = append(tolerationList, toleration)
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}
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}
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return
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}
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// ComputeTaintTolerationPriorityMap prepares the priority list for all the nodes based on the number of intolerable taints on the node
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func ComputeTaintTolerationPriorityMap(pod *v1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (schedulerapi.HostPriority, error) {
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node := nodeInfo.Node()
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if node == nil {
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return schedulerapi.HostPriority{}, fmt.Errorf("node not found")
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}
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// To hold all the tolerations with Effect PreferNoSchedule
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var tolerationsPreferNoSchedule []v1.Toleration
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if priorityMeta, ok := meta.(*priorityMetadata); ok {
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tolerationsPreferNoSchedule = priorityMeta.podTolerations
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} else {
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tolerationsPreferNoSchedule = getAllTolerationPreferNoSchedule(pod.Spec.Tolerations)
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}
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return schedulerapi.HostPriority{
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Host: node.Name,
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Score: countIntolerableTaintsPreferNoSchedule(node.Spec.Taints, tolerationsPreferNoSchedule),
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}, nil
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}
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// ComputeTaintTolerationPriorityReduce calculates the source of each node based on the number of intolerable taints on the node
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func ComputeTaintTolerationPriorityReduce(pod *v1.Pod, meta interface{}, nodeNameToInfo map[string]*schedulercache.NodeInfo, result schedulerapi.HostPriorityList) error {
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var maxCount int
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for i := range result {
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if result[i].Score > maxCount {
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maxCount = result[i].Score
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}
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}
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maxCountFloat := float64(maxCount)
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for i := range result {
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fScore := float64(schedulerapi.MaxPriority)
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if maxCountFloat > 0 {
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fScore = (1.0 - float64(result[i].Score)/maxCountFloat) * float64(schedulerapi.MaxPriority)
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}
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if glog.V(10) {
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// We explicitly don't do glog.V(10).Infof() to avoid computing all the parameters if this is
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// not logged. There is visible performance gain from it.
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glog.Infof("%v -> %v: Taint Toleration Priority, Score: (%d)", pod.Name, result[i].Host, int(fScore))
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}
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result[i].Score = int(fScore)
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}
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return nil
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}
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