Add process information to the UI.

For root, we report all processes. Process stats are refreshed every minute.

manager/container.go

@@ -117,14 +117,18 @@ func (c *containerData) DerivedStats() (v2.DerivedStats, error) {
 }
 
 func (c *containerData) GetProcessList() ([]v2.ProcessInfo, error) {
+	// report all processes for root.
+	isRoot := c.info.Name == "/"
+	pidMap := map[int]bool{}
+	if !isRoot {
 		pids, err := c.handler.ListProcesses(container.ListSelf)
 		if err != nil {
 			return nil, err
 		}
-	pidMap := map[int]bool{}
 		for _, pid := range pids {
 			pidMap[pid] = true
 		}
+	}
 	// TODO(rjnagal): Take format as an option?
 	format := "user,pid,ppid,stime,pcpu,rss,vsz,stat,time,comm"
 	args := []string{"-e", "-o", format}
@@ -151,7 +155,7 @@ func (c *containerData) GetProcessList() ([]v2.ProcessInfo, error) {
 		if err != nil {
 			return nil, fmt.Errorf("invalid ppid %q: %v", fields[2], err)
 		}
-		if pidMap[pid] == true {
+		if isRoot || pidMap[pid] == true {
 			processes = append(processes, v2.ProcessInfo{
 				User:        fields[0],
 				Pid:         pid,

pages/containers_html.go

@@ -108,6 +108,12 @@ const containersHtmlTemplate = `
           </div>
           <div id="usage-gauge" class="panel-body"></div>
 	</div>
+	<div class="panel panel-primary">
+          <div class="panel-heading">
+            <h3 class="panel-title">Processes</h3>
+          </div>
+          <div id="processes-top" class="panel-body"></div>
+	</div>
 	{{if .CpuAvailable}}
 	<div class="panel panel-primary">
           <div class="panel-heading">