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cdbca4061b
Older versions of Go don't format comments, so committing this as
a separate commit, so that we can already make these changes before
we upgrade to Go 1.19.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 52c1a2fae8)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
64 lines
2.3 KiB
Go
64 lines
2.3 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"context"
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"errors"
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"fmt"
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"time"
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containertypes "github.com/docker/docker/api/types/container"
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units "github.com/docker/go-units"
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)
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// ContainerTop handles `docker top` client requests.
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//
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// Future considerations:
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// - Windows users are far more familiar with CPU% total.
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// Further, users on Windows rarely see user/kernel CPU stats split.
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// The kernel returns everything in terms of 100ns. To obtain
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// CPU%, we could do something like docker stats does which takes two
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// samples, subtract the difference and do the maths. Unfortunately this
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// would slow the stat call down and require two kernel calls. So instead,
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// we do something similar to linux and display the CPU as combined HH:MM:SS.mmm.
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// - Perhaps we could add an argument to display "raw" stats
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// - "Memory" is an extremely overloaded term in Windows. Hence we do what
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// task manager does and use the private working set as the memory counter.
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// We could return more info for those who really understand how memory
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// management works in Windows if we introduced a "raw" stats (above).
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func (daemon *Daemon) ContainerTop(name string, psArgs string) (*containertypes.ContainerTopOKBody, error) {
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// It's not at all an equivalent to linux 'ps' on Windows
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if psArgs != "" {
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return nil, errors.New("Windows does not support arguments to top")
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}
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container, err := daemon.GetContainer(name)
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if err != nil {
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return nil, err
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}
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if !container.IsRunning() {
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return nil, errNotRunning(container.ID)
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}
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if container.IsRestarting() {
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return nil, errContainerIsRestarting(container.ID)
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}
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s, err := daemon.containerd.Summary(context.Background(), container.ID)
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if err != nil {
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return nil, err
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}
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procList := &containertypes.ContainerTopOKBody{}
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procList.Titles = []string{"Name", "PID", "CPU", "Private Working Set"}
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for _, j := range s {
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d := time.Duration((j.KernelTime_100Ns + j.UserTime_100Ns) * 100) // Combined time in nanoseconds
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procList.Processes = append(procList.Processes, []string{
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j.ImageName,
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fmt.Sprint(j.ProcessID),
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fmt.Sprintf("%02d:%02d:%02d.%03d", int(d.Hours()), int(d.Minutes())%60, int(d.Seconds())%60, int(d.Nanoseconds()/1000000)%1000),
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units.HumanSize(float64(j.MemoryWorkingSetPrivateBytes))})
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}
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return procList, nil
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}
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