Merge pull request #293 from zhuangqh/fix/v2-cpuset-ctrl

cgroup2: only enable the cpuset controller if cpus or mems is specified

Author: AkihiroSuda

cgroup2/manager.go

@@ -96,7 +96,9 @@ func (r *Resources) Values() (o []Value) {
 func (r *Resources) EnabledControllers() (c []string) {
 	if r.CPU != nil {
 		c = append(c, "cpu")
-		c = append(c, "cpuset")
+		if r.CPU.Cpus != "" || r.CPU.Mems != "" {
+			c = append(c, "cpuset")
+		}
 	}
 	if r.Memory != nil {
 		c = append(c, "memory")