<para>Turn on CPU usage accounting for this unit. Takes a
boolean argument. Note that turning on CPU accounting for
one unit might also implicitly turn it on for all units
- contained in the same slice and for all its parent slices and
- the units contained therein.</para>
+ contained in the same slice and for all its parent slices
+ and the units contained therein. The system default for this
+ setting maybe controlled with
+ <varname>DefaultCPUAccounting=</varname> in
+ <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</listitem>
</varlistentry>
<para>Turn on process and kernel memory accounting for this
unit. Takes a boolean argument. Note that turning on memory
accounting for one unit might also implicitly turn it on for
- all units contained in the same slice and for all its parent
- slices and the units contained therein.</para>
+ all its parent slices. The system default for this setting
+ maybe controlled with
+ <varname>DefaultMemoryAccounting=</varname> in
+ <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</listitem>
</varlistentry>
<para>Turn on Block IO accounting for this unit. Takes a
boolean argument. Note that turning on block IO accounting
for one unit might also implicitly turn it on for all units
- contained in the same slice and all for its parent slices and
- the units contained therein.</para>
+ contained in the same slice and all for its parent slices
+ and the units contained therein. The system default for this
+ setting maybe controlled with
+ <varname>DefaultBlockIOAccounting=</varname> in
+ <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</listitem>
</varlistentry>
followed by a device group name, as listed in
<filename>/proc/devices</filename>. The latter is useful to
whitelist all current and future devices belonging to a
- specific device group at once. Examples:
- <filename>/dev/sda5</filename> is a path to a device node,
- referring to an ATA or SCSI block
+ specific device group at once. The device group is matched
+ according to file name globbing rules, you may hence use the
+ <literal>*</literal> and <literal>?</literal>
+ wildcards. Examples: <filename>/dev/sda5</filename> is a
+ path to a device node, referring to an ATA or SCSI block
device. <literal>char-pts</literal> and
<literal>char-alsa</literal> are specifiers for all pseudo
- TTYs and all ALSA sound devices, respectively.</para>
+ TTYs and all ALSA sound devices,
+ respectively. <literal>char-cpu/*</literal> is a specifier
+ matching all CPU related device groups.</para>
</listitem>
</varlistentry>