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0a9f93443b
Requested in https://github.com/systemd/systemd/pull/15206#discussion_r505506657, preserve the full granularity for memory pressure limits (permyriad) instead of capping out at percent.
99 lines
4.6 KiB
XML
99 lines
4.6 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="oomd.conf" conditional='ENABLE_OOMD'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>oomd.conf</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>oomd.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>oomd.conf</refname>
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<refname>oomd.conf.d</refname>
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<refpurpose>Global <command>systemd-oomd</command> configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/systemd/oomd.conf</filename></para>
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<para><filename>/etc/systemd/oomd.conf.d/*.conf</filename></para>
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<para><filename>/usr/lib/systemd/oomd.conf.d/*.conf</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>These files configure the various parameters of the
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> userspace
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out-of-memory (OOM) killer,
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<citerefentry><refentrytitle>systemd-oomd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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See <citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for a general description of the syntax.</para>
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</refsect1>
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<xi:include href="standard-conf.xml" xpointer="main-conf" />
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<refsect1>
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<title>[OOM] Section Options</title>
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<para>The following options are available in the [OOM] section:</para>
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<variablelist class='config-directives'>
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<varlistentry>
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<term><varname>SwapUsedLimitPercent=</varname></term>
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<listitem><para>Sets the limit for swap usage on the system before <command>systemd-oomd</command> will
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take action. If the percentage of swap used on the system is more than what is defined here,
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<command>systemd-oomd</command> will act on eligible descendant cgroups, starting from the ones with the
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highest swap usage to the lowest swap usage. Which cgroups are monitored and what
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action gets taken depends on what the unit has configured for <varname>ManagedOOMSwap=</varname>.
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Takes a percentage value between 0% and 100%, inclusive. Defaults to 90%.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultMemoryPressureLimit=</varname></term>
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<listitem><para>Sets the limit for memory pressure on the unit's cgroup before <command>systemd-oomd</command>
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will take action. A unit can override this value with <varname>ManagedOOMMemoryPressureLimit=</varname>.
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The memory pressure for this property represents the fraction of time in a 10 second window in which all tasks
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in the cgroup were delayed. For each monitored cgroup, if the memory pressure on that cgroup exceeds the
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limit set for longer than the duration set by <varname>DefaultMemoryPressureDurationSec=</varname>,
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<command>systemd-oomd</command> will act on eligible descendant cgroups,
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starting from the ones with the most reclaim activity to the least reclaim activity. Which cgroups are
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monitored and what action gets taken depends on what the unit has configured for
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<varname>ManagedOOMMemoryPressure=</varname>. Takes a percentage value between 0% and 100%, inclusive.
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Defaults to 60%.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultMemoryPressureDurationSec=</varname></term>
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<listitem><para>Sets the amount of time a unit's cgroup needs to have exceeded memory pressure limits before
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<command>systemd-oomd</command> will take action. Memory pressure limits are defined by
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<varname>DefaultMemoryPressureLimit=</varname> and <varname>ManagedOOMMemoryPressureLimit=</varname>.
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Defaults to 30 seconds when this property is unset or set to 0.</para></listitem>
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</varlistentry>
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</variablelist>
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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.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-oomd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>oomctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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