android不适用于bg_non_interactive吗？

Question

当我在Android中使用cgroup作为cpu限制时，我发现它不起作用，我编写了测试演示，我启动了4个线程，而cpu是97％，然后我回到后台并我的应用是4:cpu:/bg_non_interactive，但是cpu仍然是97％，但不是10％。...

    new Thread(new Runnable() {
        @Override
        public void run() {
            int i = 0;
            while(true) {
                i++;
            }
        }
    }).start();
    new Thread(new Runnable() {
        @Override
        public void run() {
            int i = 0;
            while(true) {
                i++;
            }
        }
    }).start();
    new Thread(new Runnable() {
        @Override
        public void run() {
            int i = 0;
            while(true) {
                i++;
            }
        }
    }).start();
    new Thread(new Runnable() {
        @Override
        public void run() {
            int i = 0;
            while(true) {
                i++;
            }
        }
    }).start();

  PID PR CPU% S  #THR     VSS     RSS PCY UID      Name
 1841  1  97% S    24 869604K  45368K  bg u0_a502  com.xxx.eventdemo
   34  2   0% S     1      0K      0K  fg root     kconsole
 4869  2   0% R     1   2184K    948K  fg root     top
  646  1   0% S     4   5716K   1424K  fg media_rw /system/bin/sdcard

130|root@rk3288:/dev/cpuctl # cat /proc/1841/cgroup                            
4:cpu:/bg_non_interactive
2:memory:/sw
1:cpuacct:/uid_10502/pid_1841