man/oomd.conf.xml

   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>