<title>Description</title>
<para>A unit configuration file whose name ends in
- <literal>.slice</literal> encodes information about a slice
- created by systemd to manage resources used by a certain group of
+ <literal>.slice</literal> encodes information about a slice which
+ is a concept for hierarchically managing resources of a group of
processes. This management is performed by creating a node in the
- 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
+ (primarily scope and service units) may be assigned to a specific
+ slice. For each slice, certain resource limits may be set that
+ apply to all processes of all units contained in that
+ slice. Slices are organized hierarchically 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>.
</para>
+ <para>By default, service and scope units are placed in
+ <filename>system.slice</filename>, virtual machines and containers
+ registered with
+ <citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ are found in <filename>machine.slice</filename>, and user sessions
+ handled by
+ <citerefentry><refentrytitle>systemd-logind</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ in <filename>user.slice</filename>. See
+ <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for more information.</para>
+
<para>See
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for the common options of all unit configuration
files. The common configuration items are configured
in the generic [Unit] and [Install] sections. The
slice specific configuration options are configured in
- the [Slice] section. Currently, only generic cgroup settings
+ the [Slice] section. Currently, only generic resource control settings
as described in
- <citerefentry><refentrytitle>systemd.cgroup</refentrytitle><manvolnum>7</manvolnum></citerefentry> are allowed.
+ <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>7</manvolnum></citerefentry> are allowed.
</para>
<para>Unless <varname>DefaultDependencies=false</varname>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.cgroup</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
+ <citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>