94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors All rights reserved.
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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 kvm
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import (
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"bytes"
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"fmt"
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"strconv"
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"strings"
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"text/template"
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)
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// numaTmpl NUMA XML Template
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const numaTmpl = `
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<numa>
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{{- range $idx,$val :=. }}
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<cell id='{{$idx}}' cpus='{{$val.CPUTopology}}' memory='{{$val.Memory}}' unit='MiB'/>
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{{- end }}
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</numa>
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`
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// NUMA this struct use for numaTmpl
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type NUMA struct {
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// cpu count on numa node
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CPUCount int
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// memory on numa node
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Memory int
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// cpu sequence on numa node eg: 0,1,2,3
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CPUTopology string
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}
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// numaXML generate numa xml
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// evenly distributed cpu core & memory to each numa node
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func numaXML(cpu, memory, numaCount int) (string, error) {
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if numaCount < 1 {
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return "", fmt.Errorf("numa node count must >= 1")
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}
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if cpu < numaCount {
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return "", fmt.Errorf("cpu count must >= numa node count")
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}
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numaNodes := make([]*NUMA, numaCount)
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CPUSeq := 0
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cpuBaseCount := cpu / numaCount
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cpuExtraCount := cpu % numaCount
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for i := range numaNodes {
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numaNodes[i] = &NUMA{CPUCount: cpuBaseCount}
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}
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for i := 0; i < cpuExtraCount; i++ {
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numaNodes[i].CPUCount++
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}
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for i := range numaNodes {
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CPUTopologySlice := make([]string, 0)
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for seq := CPUSeq; seq < CPUSeq+numaNodes[i].CPUCount; seq++ {
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CPUTopologySlice = append(CPUTopologySlice, strconv.Itoa(seq))
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}
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numaNodes[i].CPUTopology = strings.Join(CPUTopologySlice, ",")
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CPUSeq += numaNodes[i].CPUCount
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}
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memoryBaseCount := memory / numaCount
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memoryExtraCount := memory % numaCount
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for i := range numaNodes {
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numaNodes[i].Memory = memoryBaseCount
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}
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for i := 0; i < memoryExtraCount; i++ {
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numaNodes[i].Memory++
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}
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tmpl := template.Must(template.New("numa").Parse(numaTmpl))
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var numaXML bytes.Buffer
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if err := tmpl.Execute(&numaXML, numaNodes); err != nil {
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return "", fmt.Errorf("couldn't generate numa XML: %v", err)
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}
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return numaXML.String(), nil
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}
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