package cgroups import ( "fmt" "io/ioutil" "os" "path/filepath" "strconv" "strings" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" ) type cpuHandler struct { } func getCPUHandler() *cpuHandler { return &cpuHandler{} } func cleanString(s string) string { return strings.Trim(s, "\n") } func readAcct(ctr *CgroupControl, name string) (uint64, error) { p := filepath.Join(ctr.getCgroupv1Path(CPUAcct), name) return readFileAsUint64(p) } func readAcctList(ctr *CgroupControl, name string) ([]uint64, error) { var r []uint64 p := filepath.Join(ctr.getCgroupv1Path(CPUAcct), name) data, err := ioutil.ReadFile(p) if err != nil { return nil, errors.Wrapf(err, "reading %s", p) } for _, s := range strings.Split(string(data), " ") { s = cleanString(s) if s == "" { break } v, err := strconv.ParseUint(s, 10, 0) if err != nil { return nil, errors.Wrapf(err, "parsing %s", s) } r = append(r, v) } return r, nil } // Apply set the specified constraints func (c *cpuHandler) Apply(ctr *CgroupControl, res *spec.LinuxResources) error { if res.CPU == nil { return nil } return fmt.Errorf("cpu apply not implemented yet") } // Create the cgroup func (c *cpuHandler) Create(ctr *CgroupControl) (bool, error) { if ctr.cgroup2 { return false, fmt.Errorf("cpu create not implemented for cgroup v2") } return ctr.createCgroupDirectory(CPU) } // Destroy the cgroup func (c *cpuHandler) Destroy(ctr *CgroupControl) error { return os.Remove(ctr.getCgroupv1Path(CPU)) } // Stat fills a metrics structure with usage stats for the controller func (c *cpuHandler) Stat(ctr *CgroupControl, m *Metrics) error { var err error usage := CPUUsage{} if ctr.cgroup2 { values, err := readCgroup2MapFile(ctr, "cpu.stat") if err != nil { return err } if val, found := values["usage_usec"]; found { usage.Kernel, err = strconv.ParseUint(cleanString(val[0]), 10, 0) if err != nil { return err } usage.Kernel *= 1000 } if val, found := values["system_usec"]; found { usage.Total, err = strconv.ParseUint(cleanString(val[0]), 10, 0) if err != nil { return err } usage.Total *= 1000 } // FIXME: How to read usage.PerCPU? } else { usage.Total, err = readAcct(ctr, "cpuacct.usage") if err != nil { return err } usage.Kernel, err = readAcct(ctr, "cpuacct.usage_sys") if err != nil { return err } usage.PerCPU, err = readAcctList(ctr, "cpuacct.usage_percpu") if err != nil { return err } } m.CPU = CPUMetrics{Usage: usage} return nil }