use /host prefix to access /proc

main.go

@@ -15,7 +15,6 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
-	"time"
 
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/filters"
@@ -100,16 +99,7 @@ func listenForMounts() {
 				panic(err)
 			} else {
 				pid := info.State.Pid
-				var version int
-				var err error
-				for i := 0; i < 20; i++ {
-					version, err = cgroup.GetDeviceCGroupVersion("/", pid)
-					if err == nil {
-						break
-					} else {
-						time.Sleep(200 * time.Millisecond)
-					}
-				}
+				version, err := cgroup.GetDeviceCGroupVersion("/host", pid)
 				log.Printf("The cgroup version for process %d is: %v\n", pid, version)
 				if err != nil {
 					log.Println(err)