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man: Document app, session and background special user slice units 

Add documentation for the special slice user slice units.
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Benjamin Berg 2020-07-28 19:11:19 +02:00
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man/systemd.special.xml
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@ -1192,6 +1192,60 @@
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Special User Slice Units</title>
<para>There are four <literal>.slice</literal> units which form the basis of the user hierarchy for
assignment of resources for user applications and services. See
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>7</manvolnum></citerefentry>
for details about slice units and the documentation about
<ulink url="https://systemd.io/DESKTOP_ENVIRONMENTS">Desktop Environments</ulink>
for further information.</para>
<variablelist>
<varlistentry>
<term><filename>-.slice</filename></term>
<listitem>
<para>The root slice is the root of the user's slice hierarchy.
It usually does not contain units directly, but may be used to set defaults for the whole tree.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>app.slice</filename></term>
<listitem>
<para>By default, all user services and applications managed by
<command>systemd</command> are found in this slice.
All interactively launched applications like web browsers and text editors
as well as non-critical services should be placed into this slice.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>session.slice</filename></term>
<listitem>
<para>All essential services and applications required for the
session should use this slice.
These are services that either cannot be restarted easily
or where latency issues may affect the interactivity of the system and applications.
This includes the display server, screen readers and other services such as DBus or XDG portals.
Such services should be configured to be part of this slice by
adding <varname>Slice=session.slice</varname> to their unit files.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>background.slice</filename></term>
<listitem>
<para>All services running low-priority background tasks should use this slice.
This permits resources to be preferentially assigned to the other slices.
Examples include non-interactive tasks like file indexing or backup operations
where latency is not important.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>
</refsect1>
<refsect1>