2.11.2. Finding a Subsystem
To find out what subsystems are available in your kernel and how they are mounted together into hierarchies, run:
cat /proc/cgroups#subsys_name hierarchy num_cgroups enabled cpuset 2 1 1 ns 0 1 1 cpu 3 1 1 cpuacct 4 1 1 memory 5 1 1 devices 6 1 1 freezer 7 1 1 net_cls 8 1 1 blkio 9 3 1 perf_event 0 1 1 net_prio 0 1 1
In the example output above, the
hierarchycolumn lists IDs of the existing hierarchies on the system. Subsystems with the same hierarchy ID are attached to the same hierarchy. The
num_cgroupcolumn lists the number of existing cgroups in the hierarchy that uses a particular subsystem. The
enabledcolumn reports the value of
1if a particular subsystem is enabled, or
0if it is not.
Or, to find the mount points of particular subsystems, run:
lssubsys -m subsystems
where subsystems is a list of the subsystems in which you are interested. Note that the
lssubsys -mcommand returns only the top-level mount point per each hierarchy.