[ Thanks to Linuxaria for this link.
]
“A control group is a collection of processes that are bound by
the same criteria. These groups can be hierarchical, where each
group inherits limits from its parent group. The kernel provides
access to multiple controllers (subsystems) through the cgroups
interface.“The infrastructure of Cgroups provides only the features of
grouping the tasks, while the various Cgroups subsystem implements
the specific control policies for each resource. This framework
it’s really powerful and allow you to set rules on resources not
only based on users and groups.”