??????????????
12:rdma:/
11:cpuset:/
10:perf_event:/
9:memory:/user.slice/user-0.slice/user@0.service/init.scope
8:freezer:/
7:net_cls,net_prio:/
6:blkio:/user.slice
5:hugetlb:/
4:devices:/user.slice
3:cpu,cpuacct:/user.slice
2:pids:/user.slice/user-0.slice/user@0.service/init.scope
1:name=systemd:/user.slice/user-0.slice/user@0.service/init.scope