- <listitem>
- <para>Set the specified control group attribute of the
- specified unit to the specified value. Takes a unit
- name and an attribute name such as
- <literal>cpu.shares</literal>, plus one or more values
- (multiple values may only be used for attributes that take
- multiple values). This operation will immediately update the
- kernel attribute for this unit and persistently store this
- setting for later reboots (unless <option>--runtime</option>
- is passed, in which case the setting is not saved
- persistently and only valid until the next reboot.) Instead
- of low-level control group attribute names high-level pretty
- names may be used, as used for unit execution environment
- configuration, see
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details. For example, passing
- <literal>memory.limit_in_bytes</literal> and
- <literal>MemoryLimit</literal> is equivalent. This operation
- will implicitly create a control group for the unit in the
- controller the attribute belongs to, if needed. For
- attributes that take multiple values, this operation will
- append the specified values to the previously set values
- list (use <command>unset-cgroup-attr</command> to reset the
- list explicitly). For attributes that take a single value
- only the list will be reset implicitly.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>unset-cgroup-attr <replaceable>NAME</replaceable> <replaceable>ATTRIBUTE</replaceable>...</command></term>
-
- <listitem><para>Unset the specified control group attributes
- of the specified unit. Takes a unit name and one or more
- attribut names such as <literal>cpu.shares</literal>. This
- operation might or might not have an immediate effect on the
- current kernel attribute value. This will remove any
- persistently stored configuration values for this attribute
- (as set with <command>set-cgroup-attr</command> before),
- unless <option>--runtime</option> is passed, in which case the
- configuration is reset only until the next reboot. Again,
- high-level control group attributes may be used instead of the
- low-level kernel ones. For attributes which take multiple
- values, all currently set values are reset.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><command>set-cgroup <replaceable>NAME</replaceable> <replaceable>CGROUP</replaceable>...</command></term>
- <term><command>unset-cgroup <replaceable>NAME</replaceable> <replaceable>CGROUP</replaceable>...</command></term>
-
- <listitem><para>Add or remove a unit to/from a specific
- control group hierarchy and/or control group path. Takes a
- unit name, plus a control group specification in the syntax
- <replaceable>CONTROLLER</replaceable>:<replaceable>PATH</replaceable>
- or <replaceable>CONTROLLER</replaceable>. In the latter syntax
- (where the path is omitted) the default unit control group
- path is implied. Examples: <literal>cpu</literal> or
- <literal>cpu:/foo/bar</literal>. If a unit is removed from a
- control group hierarchy all its processes will be moved to the
- root group of the hierarchy and all control group attributes
- will be reset. These operations are immediately reflected in
- the kernel hierarchy, and stored persistently to disk (unless
- <option>--runtime</option> is passed).</para>