1<?xml version='1.0'?> <!--*-nxml-*-->
2<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
4<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
5
6<refentry id="oomd.conf" conditional='ENABLE_OOMD'
7    xmlns:xi="http://www.w3.org/2001/XInclude">
8  <refentryinfo>
9    <title>oomd.conf</title>
10    <productname>systemd</productname>
11  </refentryinfo>
12
13  <refmeta>
14    <refentrytitle>oomd.conf</refentrytitle>
15    <manvolnum>5</manvolnum>
16  </refmeta>
17
18  <refnamediv>
19    <refname>oomd.conf</refname>
20    <refname>oomd.conf.d</refname>
21    <refpurpose>Global <command>systemd-oomd</command> configuration files</refpurpose>
22  </refnamediv>
23
24  <refsynopsisdiv>
25    <para><filename>/etc/systemd/oomd.conf</filename></para>
26    <para><filename>/etc/systemd/oomd.conf.d/*.conf</filename></para>
27    <para><filename>/usr/lib/systemd/oomd.conf.d/*.conf</filename></para>
28  </refsynopsisdiv>
29
30  <refsect1>
31    <title>Description</title>
32
33    <para>These files configure the various parameters of the
34    <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> userspace
35    out-of-memory (OOM) killer,
36    <citerefentry><refentrytitle>systemd-oomd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
37    See <citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry>
38    for a general description of the syntax.</para>
39
40  </refsect1>
41
42  <xi:include href="standard-conf.xml" xpointer="main-conf" />
43
44  <refsect1>
45    <title>[OOM] Section Options</title>
46
47    <para>The following options are available in the [OOM] section:</para>
48
49    <variablelist class='config-directives'>
50      <varlistentry>
51        <term><varname>SwapUsedLimit=</varname></term>
52
53        <listitem><para>Sets the limit for memory and swap usage on the system before <command>systemd-oomd</command>
54        will take action. If the fraction of memory used and the fraction of swap used on the system are both more than
55        what is defined here, <command>systemd-oomd</command> will act on eligible descendant control groups with swap
56        usage greater than 5% of total swap, starting from the ones with the highest swap usage. Which
57        control groups are monitored and what action gets taken depends on what the unit has configured for
58        <varname>ManagedOOMSwap=</varname>.  Takes a value specified in percent (when suffixed with "%"),
59        permille ("‰") or permyriad ("‱"), between 0% and 100%, inclusive. Defaults to 90%.</para></listitem>
60      </varlistentry>
61
62      <varlistentry>
63        <term><varname>DefaultMemoryPressureLimit=</varname></term>
64
65        <listitem><para>Sets the limit for memory pressure on the unit's control group before
66        <command>systemd-oomd</command> will take action. A unit can override this value with
67        <varname>ManagedOOMMemoryPressureLimit=</varname>.  The memory pressure for this property represents
68        the fraction of time in a 10 second window in which all tasks in the control group were delayed. For
69        each monitored control group, if the memory pressure on that control group exceeds the limit set for
70        longer than the duration set by <varname>DefaultMemoryPressureDurationSec=</varname>,
71        <command>systemd-oomd</command> will act on eligible descendant control groups, starting from the
72        ones with the most reclaim activity to the least reclaim activity. Which control groups are monitored
73        and what action gets taken depends on what the unit has configured for
74        <varname>ManagedOOMMemoryPressure=</varname>. Takes a fraction specified in the same way as
75        <varname>SwapUsedLimit=</varname> above. Defaults to 60%.</para></listitem>
76      </varlistentry>
77
78      <varlistentry>
79        <term><varname>DefaultMemoryPressureDurationSec=</varname></term>
80
81        <listitem><para>Sets the amount of time a unit's control group needs to have exceeded memory pressure
82        limits before <command>systemd-oomd</command> will take action. Memory pressure limits are defined by
83        <varname>DefaultMemoryPressureLimit=</varname> and <varname>ManagedOOMMemoryPressureLimit=</varname>.
84        Must be set to 0, or at least 1 second. Defaults to 30 seconds when unset or 0.</para></listitem>
85      </varlistentry>
86
87    </variablelist>
88  </refsect1>
89
90  <refsect1>
91      <title>See Also</title>
92      <para>
93        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
94        <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
95        <citerefentry><refentrytitle>systemd-oomd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
96        <citerefentry><refentrytitle>oomctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
97      </para>
98  </refsect1>
99
100</refentry>
101