Documentation/admin-guide/cgroup-v2.rst

209 Initially, only the root cgroup exists to which all processes belong.
790 	A read-write single value file which exists on non-root
812 	A read-write new-line separated values file which exists on
838 	A read-write new-line separated values file which exists on
863 	A read-only space separated values file which exists on all
870 	A read-write space separated values file which exists on all
885 	A read-only flat-keyed file which exists on non-root cgroups.
929 	A read-write single value file which exists on non-root cgroups.
987 	This file exists whether the controller is enabled or not.
1002 	A read-write single value file which exists on non-root
1008 	A read-write single value file which exists on non-root
1020 	A read-write two value file which exists on non-root cgroups.
1032 	A read-only nested-key file which exists on non-root cgroups.
1038         A read-write single value file which exists on non-root cgroups.
1053         A read-write single value file which exists on non-root cgroups.
1096 	A read-only single value file which exists on non-root
1103 	A read-write single value file which exists on non-root
1129 	A read-write single value file which exists on non-root
1152 	A read-write single value file which exists on non-root
1164 	A read-write single value file which exists on non-root
1185 	A read-write single value file which exists on non-root
1203 	A read-only flat-keyed file which exists on non-root cgroups.
1250 	A read-only flat-keyed file which exists on non-root cgroups.
1387 	A read-only nested-keyed file which exists on non-root cgroups.
1412 	A read-only single value file which exists on non-root
1419 	A read-write single value file which exists on non-root
1435 	A read-write single value file which exists on non-root
1442 	A read-only flat-keyed file which exists on non-root cgroups.
1467 	A read-only nested-key file which exists on non-root cgroups.
1550 	A read-write nested-keyed file with exists only on the root
1605 	A read-write nested-keyed file with exists only on the root
1647 	A read-write flat-keyed file which exists on non-root cgroups.
1667 	A read-write nested-keyed file which exists on non-root
1706 	A read-only nested-key file which exists on non-root cgroups.
1871 	A read-write single value file which exists on non-root
1877 	A read-only single value file which exists on all cgroups.
1910 	A read-write multiple values file which exists on non-root
1932 	A read-only multiple values file which exists on all
1949 	A read-write multiple values file which exists on non-root
1972 	A read-only multiple values file which exists on all
1988 	A read-write single value file which exists on non-root
2095 	A readwrite nested-keyed file that exists for all the cgroups
2117 	It exists for all the cgroup except root.
2134 	Show current usage for "hugepagesize" hugetlb.  It exists for all
2139 	The default value is "max".  It exists for all the cgroup except root.
2142 	A read-only flat-keyed file which exists on non-root cgroups.