mirror of https://github.com/k3s-io/k3s
54 lines
1.9 KiB
Go
54 lines
1.9 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package priorities
|
|
|
|
import (
|
|
schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
|
|
"k8s.io/kubernetes/pkg/scheduler/schedulercache"
|
|
)
|
|
|
|
var (
|
|
leastResourcePriority = &ResourceAllocationPriority{"LeastResourceAllocation", leastResourceScorer}
|
|
|
|
// LeastRequestedPriorityMap is a priority function that favors nodes with fewer requested resources.
|
|
// It calculates the percentage of memory and CPU requested by pods scheduled on the node, and
|
|
// prioritizes based on the minimum of the average of the fraction of requested to capacity.
|
|
//
|
|
// Details:
|
|
// cpu((capacity-sum(requested))*10/capacity) + memory((capacity-sum(requested))*10/capacity)/2
|
|
LeastRequestedPriorityMap = leastResourcePriority.PriorityMap
|
|
)
|
|
|
|
func leastResourceScorer(requested, allocable *schedulercache.Resource, includeVolumes bool, requestedVolumes int, allocatableVolumes int) int64 {
|
|
return (leastRequestedScore(requested.MilliCPU, allocable.MilliCPU) +
|
|
leastRequestedScore(requested.Memory, allocable.Memory)) / 2
|
|
}
|
|
|
|
// The unused capacity is calculated on a scale of 0-10
|
|
// 0 being the lowest priority and 10 being the highest.
|
|
// The more unused resources the higher the score is.
|
|
func leastRequestedScore(requested, capacity int64) int64 {
|
|
if capacity == 0 {
|
|
return 0
|
|
}
|
|
if requested > capacity {
|
|
return 0
|
|
}
|
|
|
|
return ((capacity - requested) * int64(schedulerapi.MaxPriority)) / capacity
|
|
}
|