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+<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2012 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-cgtop"
+    xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>systemd-cgtop</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Developer</contrib>
+        <firstname>Lennart</firstname>
+        <surname>Poettering</surname>
+        <email>lennart@poettering.net</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>systemd-cgtop</refentrytitle>
+    <manvolnum>1</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>systemd-cgtop</refname>
+    <refpurpose>Show top control groups by their resource usage</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <cmdsynopsis>
+      <command>systemd-cgtop</command>
+      <arg choice="opt" rep="repeat">OPTIONS</arg>
+      <arg choice="opt">GROUP</arg>
+    </cmdsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><command>systemd-cgtop</command> shows the top control
+    groups of the local Linux control group hierarchy, ordered by
+    their CPU, memory, or disk I/O load. The display is refreshed in
+    regular intervals (by default every 1s), similar in style to
+    <citerefentry project='man-pages'><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
+    If a control group path is specified, shows only the services of
+    the specified control group.</para>
+
+    <para>If <command>systemd-cgtop</command> is not connected to a
+    tty, no column headers are printed and the default is to only run
+    one iteration.  The <varname>--iterations=</varname> argument, if
+    given, is honored. This mode is suitable for scripting.</para>
+
+    <para>Resource usage is only accounted for control groups in the
+    relevant hierarchy, i.e. CPU usage is only accounted for control
+    groups in the <literal>cpuacct</literal> hierarchy, memory usage
+    only for those in <literal>memory</literal> and disk I/O usage for
+    those in <literal>blkio</literal>. If resource monitoring for
+    these resources is required, it is recommended to add the
+    <varname>CPUAccounting=1</varname>,
+    <varname>MemoryAccounting=1</varname> and
+    <varname>BlockIOAccounting=1</varname> settings in the unit files
+    in question. See
+    <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+    for details.</para>
+
+    <para>The CPU load value can be between 0 and 100 times the number of
+    processors the system has. For example, if the system has 8 processors,
+    the CPU load value is going to be between 0% and 800%. The number of
+    processors can be found in <literal>/proc/cpuinfo</literal>.</para>
+
+    <para>To emphasize this: unless
+    <literal>CPUAccounting=1</literal>,
+    <literal>MemoryAccounting=1</literal> and
+    <literal>BlockIOAccounting=1</literal> are enabled for the
+    services in question, no resource accounting will be available for
+    system services and the data shown by
+    <command>systemd-cgtop</command> will be incomplete.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+
+    <para>The following options are understood:</para>
+
+    <variablelist>
+      <varlistentry>
+        <term><option>-p</option></term>
+        <term><option>--order=path</option></term>
+
+        <listitem><para>Order by control group
+        path name.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-t</option></term>
+        <term><option>--order=tasks</option></term>
+
+        <listitem><para>Order by number of tasks/processes in the control group.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-c</option></term>
+        <term><option>--order=cpu</option></term>
+
+        <listitem><para>Order by CPU load.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-m</option></term>
+        <term><option>--order=memory</option></term>
+
+        <listitem><para>Order by memory usage.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-i</option></term>
+        <term><option>--order=io</option></term>
+
+        <listitem><para>Order by disk I/O load.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-b</option></term>
+        <term><option>--batch</option></term>
+
+        <listitem><para>Run in "batch" mode: do not accept input and
+        run until the iteration limit set with
+        <option>--iterations=</option> is exhausted or until killed.
+        This mode could be useful for sending output from
+        <command>systemd-cgtop</command> to other programs or to a
+        file.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-r</option></term>
+        <term><option>--raw</option></term>
+
+	<listitem><para>Format byte counts (as in memory usage and I/O metrics)
+	with raw numeric values rather than human-readable
+        numbers.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--cpu=percentage</option></term>
+        <term><option>--cpu=time</option></term>
+
+        <listitem><para>Controls whether the CPU usage is shown as
+        percentage or time. By default, the CPU usage is shown as
+        percentage. This setting may also be toggled at runtime by
+        pressing the <keycap>%</keycap> key.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-P</option></term>
+
+        <listitem><para>Count only userspace processes instead of all
+        tasks. By default, all tasks are counted: each kernel thread
+        and each userspace thread individually. With this setting,
+        kernel threads are excluded from the counting and each
+        userspace process only counts as one, regardless how many
+        threads it consists of. This setting may also be toggled at
+        runtime by pressing the <keycap>P</keycap> key. This option
+        may not be combined with
+        <option>-k</option>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-k</option></term>
+
+        <listitem><para>Count only userspace processes and kernel
+        threads instead of all tasks. By default, all tasks are
+        counted: each kernel thread and each userspace thread
+        individually. With this setting, kernel threads are included in
+        the counting and each userspace process only counts as on one,
+        regardless how many threads it consists of. This setting may
+        also be toggled at runtime by pressing the <keycap>k</keycap>
+        key. This option may not be combined with
+        <option>-P</option>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--recursive=</option></term>
+
+        <listitem><para>Controls whether the number of processes shown
+        for a control group shall include all processes that are
+        contained in any of the child control groups as well. Takes a
+        boolean argument, which defaults to <literal>yes</literal>. If
+        enabled, the processes in child control groups are included, if
+        disabled, only the processes in the control group itself are
+        counted. This setting may also be toggled at runtime by
+        pressing the <keycap>r</keycap> key. Note that this setting
+        only applies to process counting, i.e. when the
+        <option>-P</option> or <option>-k</option> options are
+        used. It has not effect if all tasks are counted, in which
+        case the counting is always recursive.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-n</option></term>
+        <term><option>--iterations=</option></term>
+
+        <listitem><para>Perform only this many iterations. A value of
+        0 indicates that the program should run
+        indefinitely.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-d</option></term>
+        <term><option>--delay=</option></term>
+
+        <listitem><para>Specify refresh delay in seconds (or if one of
+        <literal>ms</literal>, <literal>us</literal>,
+        <literal>min</literal> is specified as unit in this time
+        unit). This setting may also be increased and decreased at
+        runtime by pressing the <keycap>+</keycap> and
+        <keycap>-</keycap> keys.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--depth=</option></term>
+
+        <listitem><para>Maximum control group tree traversal depth.
+        Specifies how deep <command>systemd-cgtop</command> shall
+        traverse the control group hierarchies. If 0 is specified,
+        only the root group is monitored. For 1, only the first level
+        of control groups is monitored, and so on. Defaults to
+        3.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>-M <replaceable>MACHINE</replaceable></option></term>
+        <term><option>--machine=<replaceable>MACHINE</replaceable></option></term>
+
+        <listitem><para>Limit control groups shown to the part
+        corresponding to the container
+        <replaceable>MACHINE</replaceable>.
+        This option may not be used when a control group path is specified.</para></listitem>
+      </varlistentry>
+
+      <xi:include href="standard-options.xml" xpointer="help" />
+      <xi:include href="standard-options.xml" xpointer="version" />
+    </variablelist>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Keys</title>
+
+    <para><command>systemd-cgtop</command> is an interactive tool and
+    may be controlled via user input using the following keys:</para>
+
+    <variablelist>
+      <varlistentry>
+        <term><keycap>h</keycap></term>
+
+        <listitem><para>Shows a short help text.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap function="space"/></term>
+
+        <listitem><para>Immediately refresh output.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap>q</keycap></term>
+
+        <listitem><para>Terminate the program.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap>p</keycap></term>
+        <term><keycap>t</keycap></term>
+        <term><keycap>c</keycap></term>
+        <term><keycap>m</keycap></term>
+        <term><keycap>i</keycap></term>
+
+        <listitem><para>Sort the control groups by path, number of
+        tasks, CPU load, memory usage, or I/O load, respectively.  This
+        setting may also be controlled using the
+        <option>--order=</option> command line
+        switch.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap>%</keycap></term>
+
+        <listitem><para>Toggle between showing CPU time as time or
+        percentage. This setting may also be controlled using the
+        <option>--cpu=</option> command line switch.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap>+</keycap></term>
+        <term><keycap>-</keycap></term>
+
+        <listitem><para>Increase or decrease refresh delay,
+        respectively. This setting may also be controlled using the
+        <option>--delay=</option> command line
+        switch.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap>P</keycap></term>
+
+        <listitem><para>Toggle between counting all tasks, or only
+        userspace processes. This setting may also be controlled using
+        the <option>-P</option> command line switch (see
+        above).</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap>k</keycap></term>
+
+        <listitem><para>Toggle between counting all tasks, or only
+        userspace processes and kernel threads. This setting may also
+        be controlled using the <option>-k</option> command line
+        switch (see above).</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><keycap>r</keycap></term>
+
+        <listitem><para>Toggle between recursively including or
+        excluding processes in child control groups in control group
+        process counts. This setting may also be controlled using the
+        <option>--recursive=</option> command line switch. This key is
+        not available if all tasks are counted, it is only available
+        if processes are counted, as enabled with the
+        <keycap>P</keycap> or <keycap>k</keycap>
+        keys.</para></listitem>
+      </varlistentry>
+
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Exit status</title>
+
+    <para>On success, 0 is returned, a non-zero failure code
+    otherwise.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-cgls</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>