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This part of the copyright blurb stems from the GPL use recommendations: https://www.gnu.org/licenses/gpl-howto.en.html The concept appears to originate in times where version control was per file, instead of per tree, and was a way to glue the files together. Ultimately, we nowadays don't live in that world anymore, and this information is entirely useless anyway, as people are very welcome to copy these files into any projects they like, and they shouldn't have to change bits that are part of our copyright header for that. hence, let's just get rid of this old cruft, and shorten our codebase a bit.
129 lines
5.5 KiB
XML
129 lines
5.5 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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Copyright 2013 Zbigniew Jędrzejewski-Szmek
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-->
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<refentry id="systemd.slice">
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<refentryinfo>
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<title>systemd.slice</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd.slice</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.slice</refname>
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<refpurpose>Slice unit configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>slice</replaceable>.slice</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>A unit configuration file whose name ends in <literal>.slice</literal> encodes information about a slice
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unit. A slice unit is a concept for hierarchically managing resources of a group of processes. This management is
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performed by creating a node in the Linux Control Group (cgroup) tree. Units that manage processes (primarily scope
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and service units) may be assigned to a specific slice. For each slice, certain resource limits may be set that
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apply to all processes of all units contained in that slice. Slices are organized hierarchically in a tree. The
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name of the slice encodes the location in the tree. The name consists of a dash-separated series of names, which
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describes the path to the slice from the root slice. The root slice is named <filename>-.slice</filename>. Example:
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<filename>foo-bar.slice</filename> is a slice that is located within <filename>foo.slice</filename>, which in turn
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is located in the root slice <filename>-.slice</filename>.
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</para>
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<para>Note that slice units cannot be templated, nor is possible to add multiple names to a slice unit by creating
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additional symlinks to its unit file.</para>
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<para>By default, service and scope units are placed in
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<filename>system.slice</filename>, virtual machines and containers
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registered with
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<citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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are found in <filename>machine.slice</filename>, and user sessions
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handled by
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<citerefentry><refentrytitle>systemd-logind</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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in <filename>user.slice</filename>. See
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information.</para>
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<para>See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for the common options of all unit configuration
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files. The common configuration items are configured
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in the generic [Unit] and [Install] sections. The
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slice specific configuration options are configured in
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the [Slice] section. Currently, only generic resource control settings
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as described in
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry> are allowed.
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</para>
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<para>See the <ulink
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url="https://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/">New
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Control Group Interfaces</ulink> for an introduction on how to make
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use of slice units from programs.</para>
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</refsect1>
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<refsect1>
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<title>Automatic Dependencies</title>
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<refsect2>
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<title>Implicit Dependencies</title>
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<para>The following dependencies are implicitly added:</para>
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<itemizedlist>
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<listitem><para>Slice units automatically gain dependencies of type
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<varname>After=</varname> and <varname>Requires=</varname> on
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their immediate parent slice unit.</para></listitem>
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</itemizedlist>
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</refsect2>
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<refsect2>
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<title>Default Dependencies</title>
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<para>The following dependencies are added unless <varname>DefaultDependencies=no</varname> is set:</para>
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<itemizedlist>
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<listitem><para>Slice units will automatically have dependencies of type <varname>Conflicts=</varname> and
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<varname>Before=</varname> on
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<filename>shutdown.target</filename>. These ensure that slice units are removed prior to system shutdown.
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Only slice units involved with late system shutdown should disable
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<varname>DefaultDependencies=</varname> option.</para></listitem>
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</itemizedlist>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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