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//go:build !linux
// +build !linux
package cgroups
import (
"errors"
"fmt"
"os"
"strconv"
spec "github.com/opencontainers/runtime-spec/specs-go"
)
type cpuHandler struct{}
func getCPUHandler() *cpuHandler {
return &cpuHandler{}
}
// 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, nil
}
return ctr.createCgroupDirectory(CPU)
}
// Destroy the cgroup
func (c *cpuHandler) Destroy(ctr *CgroupControl) error {
return rmDirRecursively(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.Total, err = strconv.ParseUint(cleanString(val[0]), 10, 64)
if err != nil {
return err
}
usage.Kernel *= 1000
}
if val, found := values["system_usec"]; found {
usage.Kernel, err = strconv.ParseUint(cleanString(val[0]), 10, 64)
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 {
if !errors.Is(err, os.ErrNotExist) {
return err
}
usage.Total = 0
}
usage.Kernel, err = readAcct(ctr, "cpuacct.usage_sys")
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return err
}
usage.Kernel = 0
}
usage.PerCPU, err = readAcctList(ctr, "cpuacct.usage_percpu")
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return err
}
usage.PerCPU = nil
}
}
m.CPU = CPUMetrics{Usage: usage}
return nil
}
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