blob: 1b3f84396282b0f3839d109ce8d72cdcb78b2ed5 [file] [log] [blame]
package daemon // import ""
import (
containertypes ""
// ContainerTop handles `docker top` client requests.
// Future considerations:
// -- Windows users are far more familiar with CPU% total.
// Further, users on Windows rarely see user/kernel CPU stats split.
// The kernel returns everything in terms of 100ns. To obtain
// CPU%, we could do something like docker stats does which takes two
// samples, subtract the difference and do the maths. Unfortunately this
// would slow the stat call down and require two kernel calls. So instead,
// we do something similar to linux and display the CPU as combined HH:MM:SS.mmm.
// -- Perhaps we could add an argument to display "raw" stats
// -- "Memory" is an extremely overloaded term in Windows. Hence we do what
// task manager does and use the private working set as the memory counter.
// We could return more info for those who really understand how memory
// management works in Windows if we introduced a "raw" stats (above).
func (daemon *Daemon) ContainerTop(name string, psArgs string) (*containertypes.ContainerTopOKBody, error) {
// It's not at all an equivalent to linux 'ps' on Windows
if psArgs != "" {
return nil, errors.New("Windows does not support arguments to top")
container, err := daemon.GetContainer(name)
if err != nil {
return nil, err
if !container.IsRunning() {
return nil, errNotRunning(container.ID)
if container.IsRestarting() {
return nil, errContainerIsRestarting(container.ID)
s, err := daemon.containerd.Summary(context.Background(), container.ID)
if err != nil {
return nil, err
procList := &containertypes.ContainerTopOKBody{}
procList.Titles = []string{"Name", "PID", "CPU", "Private Working Set"}
for _, j := range s {
d := time.Duration((j.KernelTime100ns + j.UserTime100ns) * 100) // Combined time in nanoseconds
procList.Processes = append(procList.Processes, []string{
fmt.Sprintf("%02d:%02d:%02d.%03d", int(d.Hours()), int(d.Minutes())%60, int(d.Seconds())%60, int(d.Nanoseconds()/1000000)%1000),
return procList, nil