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d06e7fb532
oomd.conf has two parameters with fractionals: SwapUsedLimit= and DefaultMemoryPressureLimit=, but one accepts permyriads, the other only percentages, for no apparent reason. One carries the "Percent" in the name, the other doesn't. Let's clean this up: always accept permyriads, and drop the suffix, given that it is misleading. I figure we should internally try to focus on scaling everything relative to UINT32_MAX, and if that isn't in the cards at least 10000, but never permille nor percent unless there's a really really good reason for it (e.g. interface defined by someone else).
101 lines
4.7 KiB
XML
101 lines
4.7 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>SwapUsedLimit=</varname></term>
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<listitem><para>Sets the limit for swap usage on the system before <command>systemd-oomd</command>
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will take action. If the fraction 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 control groups, starting from the
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ones with the highest swap usage to the lowest swap usage. Which control groups are monitored and
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what action gets taken depends on what the unit has configured for
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<varname>ManagedOOMSwap=</varname>. Takes a value specified in percent (when suffixed with "%"),
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permille ("‰") or permyriad ("‱"), 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 control group before
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<command>systemd-oomd</command> will take action. A unit can override this value with
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<varname>ManagedOOMMemoryPressureLimit=</varname>. The memory pressure for this property represents
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the fraction of time in a 10 second window in which all tasks in the control group were delayed. For
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each monitored control group, if the memory pressure on that control group exceeds the limit set for
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longer than the duration set by <varname>DefaultMemoryPressureDurationSec=</varname>,
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<command>systemd-oomd</command> will act on eligible descendant control groups, starting from the
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ones with the most reclaim activity to the least reclaim activity. Which control groups are monitored
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and what action gets taken depends on what the unit has configured for
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<varname>ManagedOOMMemoryPressure=</varname>. Takes a fraction specified in the same way as
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<varname>SwapUsedLimit=</varname> above. 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 control group needs to have exceeded memory pressure
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limits before <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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