- control group tree. Those processes are part of different units,
- usually <literal>.service</literal> units (see
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
+ Linux Control Group (cgroup) tree. Units that manage processes
+ (primarilly scope and service units) may be assigned to a specific
+ slice. For each slice, certain resource limits may the be set that
+ apply to all processes of all units contained in that
+ slice. Slices are organized hierarchially in a tree. The name of
+ the slice encodes the location in the tree. The name consists of a
+ dash-separated series of names, which describes the path to the
+ slice from the root slice. The root slice is named,
+ <filename>-.slice</filename>. Example:
+ <filename>foo-bar.slice</filename> is a slice that is located
+ within <filename>foo.slice</filename>, which in turn is located in
+ the root slice <filename>-.slice</filename>.