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sysfs.go
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sysfs.go
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/*
* 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.
*
* Copyright 2020 Red Hat, Inc.
*/
package sysfs
import (
"fmt"
"io/ioutil"
"path"
"strconv"
"strings"
"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
)
type CoreIdList []int
type PCIResourceList []string
type Node struct {
Id int
Cores CoreIdList
PCIResources PCIResourceList
}
type Topology struct {
NUMANodeCount int
NUMANodes []Node
}
func (tp Topology) CoreIdToNUMANodeIdMap() map[int]int {
// CPU IDs -> NUMA Node ID
CPUToNUMANode := make(map[int]int)
for _, node := range tp.NUMANodes {
for _, coreId := range node.Cores {
CPUToNUMANode[coreId] = node.Id
}
}
return CPUToNUMANode
}
type SysFS string
func parseSysfsNodeOnline(data string) (int, error) {
/*
The file content is expected to be:
"0\n" in one-node case
"0-K\n" in N-node case where K=N-1
*/
info := strings.TrimSpace(data)
pair := strings.SplitN(info, "-", 2)
if len(pair) != 2 {
return 1, nil
}
out, err := strconv.Atoi(pair[1])
if err != nil {
return 0, err
}
return out + 1, nil
}
func (sf SysFS) String() string {
return string(sf)
}
func (sf SysFS) NUMANodeCount() (int, error) {
data, err := ioutil.ReadFile(path.Join(string(sf), "devices", "system", "node", "online"))
if err != nil {
return 0, err
}
nodeNum, err := parseSysfsNodeOnline(string(data))
if err != nil {
return 0, err
}
return nodeNum, nil
}
func (sf SysFS) CoresPerNUMANode(nodeNum int) (CoreIdList, bool, error) {
data, err := ioutil.ReadFile(path.Join(string(sf), "devices", "system", "node", fmt.Sprintf("node%d", nodeNum), "cpulist"))
if err != nil {
return nil, false, err
}
cpus, err := cpuset.Parse(strings.TrimSpace(string(data)))
if err != nil {
return nil, true, err
}
return CoreIdList(cpus.ToSlice()), true, nil
}
func (sf SysFS) PCIDeviceNUMANode(pciDevice string) (int, error) {
data, err := ioutil.ReadFile(path.Join(string(sf), "bus", "pci", "devices", pciDevice, "numa_node"))
if err != nil {
return -1, err
}
return strconv.Atoi(strings.TrimSpace(string(data)))
}
func numaNodePCIDeviceMap(sf SysFS, pciDevices []string) (map[int][]string, error) {
numaToDevs := make(map[int][]string)
for _, pciDev := range pciDevices {
nodeNum, err := sf.PCIDeviceNUMANode(pciDev)
if err != nil {
return numaToDevs, err
}
numaToDevs[nodeNum] = append(numaToDevs[nodeNum], pciDev)
}
return numaToDevs, nil
}
func NewTopologyFromSysFs(sysFsPath string, pciResources map[string]string) (Topology, error) {
var err error
tp := Topology{}
sf := SysFS(sysFsPath)
tp.NUMANodeCount, err = sf.NUMANodeCount()
if err != nil {
return tp, err
}
var pciDevices []string
for pciAddr, _ := range pciResources {
pciDevices = append(pciDevices, pciAddr)
}
numaToDevs, err := numaNodePCIDeviceMap(sf, pciDevices)
if err != nil {
return tp, err
}
for nodeId := 0; nodeId < tp.NUMANodeCount; nodeId++ {
cores, found, err := sf.CoresPerNUMANode(nodeId)
if found && err != nil {
return tp, err
}
// else node offline (TODO: validate: can Linux put a node offline?)
var pciResourceList []string
for _, pciDev := range numaToDevs[nodeId] {
pciResourceList = append(pciResourceList, pciResources[pciDev])
}
tp.NUMANodes = append(tp.NUMANodes, Node{
Id: nodeId,
Cores: cores,
PCIResources: pciResourceList,
})
}
return tp, nil
}