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cgroup.go
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cgroup.go
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package cpu
import (
"bufio"
"fmt"
"io"
"os"
"path"
"strconv"
"strings"
)
const cgroupRootDir = "/sys/fs/cgroup"
// cgroup Linux cgroup
type cgroup struct {
cgroupSet map[string]string
}
// CPUCFSQuotaUs cpu.cfs_quota_us
func (c *cgroup) CPUCFSQuotaUs() (int64, error) {
data, err := readFile(path.Join(c.cgroupSet["cpu"], "cpu.cfs_quota_us"))
if err != nil {
return 0, err
}
return strconv.ParseInt(data, 10, 64)
}
// CPUCFSPeriodUs cpu.cfs_period_us
func (c *cgroup) CPUCFSPeriodUs() (uint64, error) {
data, err := readFile(path.Join(c.cgroupSet["cpu"], "cpu.cfs_period_us"))
if err != nil {
return 0, err
}
return parseUint(data)
}
// CPUAcctUsage cpuacct.usage
func (c *cgroup) CPUAcctUsage() (uint64, error) {
data, err := readFile(path.Join(c.cgroupSet["cpuacct"], "cpuacct.usage"))
if err != nil {
return 0, err
}
return parseUint(data)
}
// CPUAcctUsagePerCPU cpuacct.usage_percpu
func (c *cgroup) CPUAcctUsagePerCPU() ([]uint64, error) {
data, err := readFile(path.Join(c.cgroupSet["cpuacct"], "cpuacct.usage_percpu"))
if err != nil {
return nil, err
}
var usage []uint64
for _, v := range strings.Fields(string(data)) {
var u uint64
if u, err = parseUint(v); err != nil {
return nil, err
}
// fix possible_cpu:https://www.ibm.com/support/knowledgecenter/en/linuxonibm/com.ibm.linux.z.lgdd/lgdd_r_posscpusparm.html
if u != 0 {
usage = append(usage, u)
}
}
return usage, nil
}
// CPUSetCPUs cpuset.cpus
func (c *cgroup) CPUSetCPUs() ([]uint64, error) {
data, err := readFile(path.Join(c.cgroupSet["cpuset"], "cpuset.cpus"))
if err != nil {
return nil, err
}
cpus, err := ParseUintList(data)
if err != nil {
return nil, err
}
var sets []uint64
for k := range cpus {
sets = append(sets, uint64(k))
}
return sets, nil
}
// CurrentcGroup get current process cgroup
func currentcGroup() (*cgroup, error) {
pid := os.Getpid()
cgroupFile := fmt.Sprintf("/proc/%d/cgroup", pid)
cgroupSet := make(map[string]string)
fp, err := os.Open(cgroupFile)
if err != nil {
return nil, err
}
defer fp.Close()
buf := bufio.NewReader(fp)
for {
line, err := buf.ReadString('\n')
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
col := strings.Split(strings.TrimSpace(line), ":")
if len(col) != 3 {
return nil, fmt.Errorf("invalid cgroup format %s", line)
}
dir := col[2]
// When dir is not equal to /, it must be in docker
if dir != "/" {
cgroupSet[col[1]] = path.Join(cgroupRootDir, col[1])
if strings.Contains(col[1], ",") {
for _, k := range strings.Split(col[1], ",") {
cgroupSet[k] = path.Join(cgroupRootDir, k)
}
}
} else {
cgroupSet[col[1]] = path.Join(cgroupRootDir, col[1], col[2])
if strings.Contains(col[1], ",") {
for _, k := range strings.Split(col[1], ",") {
cgroupSet[k] = path.Join(cgroupRootDir, k, col[2])
}
}
}
}
return &cgroup{cgroupSet: cgroupSet}, nil
}