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8b9f092112
Fixes #25780. > Man page: crypttab.5 > Issue 1: Missing fullstop > Issue 2: I<cipher=>, I<hash=>, I<size=> → B<cipher=>, B<hash=>, B<size=> > > "Force LUKS mode\\&. When this mode is used, the following options are " > "ignored since they are provided by the LUKS header on the device: " > "I<cipher=>, I<hash=>, I<size=>" Seems OK to me. The full stop is there and has been for at least a few years. And we use <option> for the markup, which is appropriate here. > Man page: crypttab.5 > Issue 1: Missing fullstop > Issue 2: I<cipher=>, I<hash=>, I<keyfile-offset=>, I<keyfile-size=>, I<size=> → B<cipher=>, B<hash=>, B<keyfile-offset=>, B<keyfile-size=>, B<size=> > > "Use TrueCrypt encryption mode\\&. When this mode is used, the following " > "options are ignored since they are provided by the TrueCrypt header on the " > "device or do not apply: I<cipher=>, I<hash=>, I<keyfile-offset=>, I<keyfile-" > "size=>, I<size=>" Same. > Man page: journalctl.1 > Issue 1: make be → may be Fixed. > Issue 2: below\\&. → below: Fixed. > Man page: journalctl.1 > Issue: Colon at the end? > > "The following commands are understood\\&. If none is specified the default " > "is to display journal records\\&." > msgstr "" > "Die folgenden Befehle werden verstanden\\&. Falls keiner festgelegt ist, ist " > "die Anzeige von Journal-Datensätzen die Vorgabe\\&." This is a bit awkward, but I'm not sure how to fix it. > Man page: kernel-install.8 > Issue: methods a fallback → methods fallback It was correct, but I added a comma to make the sense clearer. > Man page: loader.conf.5 > Issue 1: secure boot variables → Secure Boot variables > Issue 2: one → one for (multiple times) > > "Supported secure boot variables are one database for authorized images, one " > "key exchange key (KEK) and one platform key (PK)\\&. For more information, " > "refer to the \\m[blue]B<UEFI specification>\\m[]\\&\\s-2\\u[2]\\d\\s+2, " > "under Secure Boot and Driver Signing\\&. Another resource that describe the " > "interplay of the different variables is the \\m[blue]B<EDK2 " > "documentation>\\m[]\\&\\s-2\\u[3]\\d\\s+2\\&." "one of" would sound strange. "One this and one that" is OK. > Man page: loader.conf.5 > Issue: systemd-boot → B<systemd-boot>(7) Fixed. > Man page: logind.conf.5 > Issue: systemd-logind → B<systemd-logind>(8) We use <filename>systemd-logind</> on subsequent references… I think that's good enough. > Man page: nss-myhostname.8 > Issue: B<getent> → B<getent>(1) Fixed. > Man page: nss-resolve.8 > Issue: B<systemd-resolved> → B<systemd-resolved>(8) The first reference does this, subsequent are shorter. > Man page: os-release.5 > Issue: Portable Services → Portable Services Documentation? Updated. > Man page: pam_systemd_home.8 > Issue: auth and account use "reason", while session and password do not? Reworded. > Man page: portablectl.1 > Issue: In systemd-portabled.service(8): Portable Services Documentation Updated. > Man page: repart.d.5 > Issue: The partition → the partition Fixed. > Man page: repart.d.5 > Issue: B<systemd-repart> → B<systemd-repart>(8) The first reference does this. I also change this one, because it's pretty far down in the text. > Man page: systemd.1 > Issue: kernel command line twice? > > "Takes a boolean argument\\&. If false disables importing credentials from " > "the kernel command line, qemu_fw_cfg subsystem or the kernel command line\\&." Apparently this was fixed already. > Man page: systemd-boot.7 > Issue: enrollement → enrollment Fixed. > Man page: systemd-cryptenroll.1 > Issue: multiple cases: any specified → the specified Reworded. > Man page: systemd-cryptenroll.1 > Issue: If this this → If this Fixed tree-wide. > Man page: systemd-cryptsetup-generator.8 > Issue: and the initrd → and in the initrd "Is honoured by the initrd" is OK, because we often speak about the initrd as a single unit. But in the same paragraph we also used "in the initrd", which makes the other use look sloppy. I changed it to "in the initrd" everywhere in that file. > Man page: systemd.directives.7 > Issue: Why are these two quoted (but not others)? > > "B<\\*(Aqh\\*(Aq>" > > B<\\*(Aqs\\*(Aq>" > > "B<\\*(Aqy\\*(Aq>" This is autogenerated from files… We use slightly different markup in different files, and it's just too hard to make it consistent. We gave up on this. > Man page: systemd.exec.5 > Issue 1: B<at>(1p) → B<at>(1) > Issue 2: B<crontab>(1p) → B<crontab>(1) Fixed. > Man page: systemd.exec.5 > Issue: B<select()> → B<select>(2) Fixed. > Man page: systemd.exec.5 > Issue: qemu → B<qemu>(1) The man page doesn't seem to be in any of the canonical places on the web. I added a link to online docs. > Man page: systemd.exec.5 > Issue: variable → variables Seems to be fixed already. > Man page: systemd-integritysetup-generator.8 > Issue: systemd-integritysetup-generator → B<systemd-integritysetup-generator> I changed <filename> to <command>. > Man page: systemd-integritysetup-generator.8 > Issue: superfluous comma at the end Already fixed. > Man page: systemd-measure.1 > Issue: (see B<--pcr-bank=>) below → (see B<--pcr-bank=> below) Reworded. > Man page: systemd-measure.1 > Issue: =PATH> → =>I<PATH> Fixed. > Man page: systemd-measure.1.po > Issue: B<--bank=DIGEST> → B<--bank=>I<DIGEST> Fixed. > Man page: systemd.netdev.5 > Issue: os the → on the Appears to have been fixed already. > Man page: systemd.netdev.5 > Issue: Onboard → On-board (as in previous string) Updated. > Man page: systemd.network.5 > Issue: B<systemd-networkd> -> B<systemd-networkd>(8) First reference does this, subsequent do not. > Man page: systemd.network.5 > Issue: B<netlabelctl> → B<netlabelctl>(8) First reference does this, subsequent do not. > Man page: systemd.network.5 > Issue: Missing verb (aquired? configured?) in the half sentence starting with "or by a " I dropped the comma. > Man page: systemd-nspawn.1 > Issue: All host users outside of that range → All other host users Reworded. > # FIXME no effect → no effect\\&. > #. type: Plain text > #: archlinux debian-unstable fedora-rawhide mageia-cauldron opensuse-tumbleweed > msgid "" > "Whichever ID mapping option is used, the same mapping will be used for users " > "and groups IDs\\&. If B<rootidmap> is used, the group owning the bind " > "mounted directory will have no effect" A period is added. Not sure if there's some other issue. > Man page: systemd-oomd.service.8 > Issue: B<systemd> → B<systemd>(1) Done. > Man page: systemd.path.5 > Issue 1: B<systemd.exec>(1) → B<systemd.exec>(5) > Issue 2: This section does not (yet?) exist Fixed. > Man page: systemd-pcrphase.service.8 > Issue 1: indicate phases into TPM2 PCR 11 ?? > Issue 2: Colon at the end of the paragraph? Fixed. > Man page: systemd-pcrphase.service.8 > Issue: final boot phase → final shutdown phase? Updated. > Man page: systemd-pcrphase.service.8 > Issue: for the the → for the Fixed tree-wide. > Man page: systemd-portabled.service.8 > Issue: In systemd-portabled.service(8): Portable Services Documentation Updated. > Man page: systemd-pstore.service.8 > Issue: Here and the following paragraphs: . → \\&. // Upstream: What does this comment mean? // You normally write \\&. for a full dot (full stop etc.); here you write only "." (i.e. a plain dot). > > "and we look up \"localhost\", nss-dns will send the following queries to " > "systemd-resolved listening on 127.0.0.53:53: first \"localhost.foobar.com\", " > "then \"localhost.barbar.com\", and finally \"localhost\". If (hopefully) the " > "first two queries fail, systemd-resolved will synthesize an answer for the " > "third query." Looks all OK to me. > Man page: systemd.resource-control.5 > Issue: Missing closing bracket after link to Control Groups version 1 Fixed. > Man page: systemd-sysext.8 > Issue: In systemd-portabled.service(8): Portable Services Documentation Updated. > Man page: systemd.timer.5 > Issue 1: B<systemd.exec>(1) → B<systemd.exec>(5) > Issue 2: This section does not (yet?) exist Fixed. > Man page: systemd.unit.5 > Issue: that is → that are Fixed. > Man page: systemd-veritysetup-generator.8 > Issue: systemd-veritysetup-generator → B<systemd-veritysetup-generator> > > "systemd-veritysetup-generator implements B<systemd.generator>(7)\\&." > > "systemd-veritysetup-generator understands the following kernel command line " > "parameters:" Updated. > Man page: systemd-volatile-root.service.8 > Issue: initrdyes → Initrd Fixed. > Man page: sysupdate.d.5 > Issue: : → \\&. (As above in TRANSFER) Updated. > Man page: sysupdate.d.5 > Issue: some → certain Updated. > Man page: sysupdate.d.5 > Issue 1: i\\&.e\\& → I\\&.e\\& Fixed. > Issue 2: the image → the system "image" seems correct. > Man page: tmpfiles.d.5 > Issue: systemd-tmpfiles → B<systemd-tmpfiles>(8) Updated.
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7.0 KiB
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133 lines
7.0 KiB
XML
<?xml version='1.0'?>
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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="systemd-oomd.service" 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>systemd-oomd.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-oomd.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-oomd.service</refname>
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<refname>systemd-oomd</refname>
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<refpurpose>A userspace out-of-memory (OOM) killer</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-oomd.service</filename></para>
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<para><filename>/usr/lib/systemd/systemd-oomd</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-oomd</command> is a system service that uses cgroups-v2 and pressure stall
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information (PSI) to monitor and take corrective action before an OOM occurs in the kernel space.</para>
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<para>You can enable monitoring and actions on units by setting <varname>ManagedOOMSwap=</varname> and
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<varname>ManagedOOMMemoryPressure=</varname> in the unit configuration, see
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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<command>systemd-oomd</command> retrieves information about such units from
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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when it starts and watches for subsequent changes.</para>
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<para>Cgroups of units with <varname>ManagedOOMSwap=</varname> or
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<varname>ManagedOOMMemoryPressure=</varname> set to <option>kill</option> will be monitored.
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<command>systemd-oomd</command> periodically polls PSI statistics for the system and those cgroups to
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decide when to take action. If the configured limits are exceeded, <command>systemd-oomd</command> will
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select a cgroup to terminate, and send <constant>SIGKILL</constant> to all processes in it. Note that
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only descendant cgroups are eligible candidates for killing; the unit with its property set to
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<option>kill</option> is not a candidate (unless one of its ancestors set their property to
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<option>kill</option>). Also only leaf cgroups and cgroups with <filename>memory.oom.group</filename> set
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to <constant>1</constant> are eligible candidates; see <varname>OOMPolicy=</varname> in
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para><citerefentry><refentrytitle>oomctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> can
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be used to list monitored cgroups and pressure information.</para>
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<para>See <citerefentry><refentrytitle>oomd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information about the configuration of this service.</para>
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</refsect1>
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<refsect1>
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<title>System requirements and configuration</title>
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<para>The system must be running systemd with a full unified cgroup hierarchy for the expected cgroups-v2 features.
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Furthermore, memory accounting must be turned on for all units monitored by <command>systemd-oomd</command>.
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The easiest way to turn on memory accounting is by ensuring the value for <varname>DefaultMemoryAccounting=</varname>
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is set to <constant>true</constant> in
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<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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<para>The kernel must be compiled with PSI support. This is available in Linux 4.20 and above.</para>
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<para>It is highly recommended for the system to have swap enabled for <command>systemd-oomd</command> to
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function optimally. With swap enabled, the system spends enough time swapping pages to let
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<command>systemd-oomd</command> react. Without swap, the system enters a livelocked state much more
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quickly and may prevent <command>systemd-oomd</command> from responding in a reasonable amount of
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time. See <ulink url="https://chrisdown.name/2018/01/02/in-defence-of-swap.html">"In defence of swap:
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common misconceptions"</ulink> for more details on swap. Any swap-based actions on systems without swap
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will be ignored. While <command>systemd-oomd</command> can perform pressure-based actions on such a
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system, the pressure increases will be more abrupt and may require more tuning to get the desired
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thresholds and behavior.</para>
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<para>Be aware that if you intend to enable monitoring and actions on <filename>user.slice</filename>,
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<filename>user-$UID.slice</filename>, or their ancestor cgroups, it is highly recommended that your
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programs be managed by the systemd user manager to prevent running too many processes under the same
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session scope (and thus avoid a situation where memory intensive tasks trigger
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<command>systemd-oomd</command> to kill everything under the cgroup). If you're using a desktop
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environment like GNOME or KDE, it already spawns many session components with the systemd user manager.
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</para>
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</refsect1>
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<refsect1>
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<title>Usage Recommendations</title>
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<para><varname>ManagedOOMSwap=</varname> works with the system-wide swap values, so setting it on the root slice
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<filename>-.slice</filename>, and allowing all descendant cgroups to be eligible candidates may make the most
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sense.</para>
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<para><varname>ManagedOOMMemoryPressure=</varname> tends to work better on the cgroups below the root
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slice. For units which tend to have processes that are less latency sensitive (e.g.
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<filename>system.slice</filename>), a higher limit like the default of 60% may be acceptable, as those
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processes can usually ride out slowdowns caused by lack of memory without serious consequences. However,
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something like <filename>user@$UID.service</filename> may prefer a much lower value like 40%.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<variablelist>
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<varlistentry>
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<term><option>--dry-run</option></term>
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<listitem><para>Do a dry run of <command>systemd-oomd</command>: when a kill is triggered, print it
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to the log instead of killing the cgroup.</para></listitem>
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</varlistentry>
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</variablelist>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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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-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>oomd.conf</refentrytitle><manvolnum>5</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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