/usr/share/doc/kernel-doc-<kernel_version>
/Documentation/cgroups/
directory.
blkio
subsystem — blkio-controller.txt
cpuacct
subsystem — cpuacct.txt
cpuset
subsystem — cpusets.txt
devices
subsystem — devices.txt
freezer
subsystem — freezer-subsystem.txt
memory
subsystem — memory.txt