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man: rework description of OOMPolicy= a bit

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One had to read to the very end of the long description to notice that
the setting is actually primarily intended for oomd. So let's mention oomd
right at the beginning.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2022-12-13 15:25:55 +01:00
parent 10b89c59dc
commit 100d37d4f3
1 changed files with 9 additions and 8 deletions
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17
man/systemd.service.xml
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@ -1123,17 +1123,18 @@
<varlistentry>
<term><varname>OOMPolicy=</varname></term>
<listitem><para>Configure the out-of-memory (OOM) kernel killer policy. Note that the userspace OOM
<listitem><para>Configure the out-of-memory (OOM) killing policy for the kernel and the userspace OOM
killer
<citerefentry><refentrytitle>systemd-oomd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
is a more flexible solution that aims to prevent out-of-memory situations for the userspace, not just
the kernel.</para>
<citerefentry><refentrytitle>systemd-oomd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
On Linux, when memory becomes scarce to the point that the kernel has trouble allocating memory for
itself, it might decide to kill a running process in order to free up memory and reduce memory
pressure. Note that <filename>systemd-oomd.service</filename> is a more flexible solution that aims
to prevent out-of-memory situations for the userspace too, not just the kernel, by attempting to
terminate services earlier, before the kernel would have to act.</para>
<para>On Linux, when memory becomes scarce to the point that the kernel has trouble allocating memory
for itself, it might decide to kill a running process in order to free up memory and reduce memory
pressure. This setting takes one of <constant>continue</constant>, <constant>stop</constant> or
<para>This setting takes one of <constant>continue</constant>, <constant>stop</constant> or
<constant>kill</constant>. If set to <constant>continue</constant> and a process of the service is
killed by the kernel's OOM killer this is logged but the service continues running. If set to
killed by the OOM killer, this is logged but the service continues running. If set to
<constant>stop</constant> the event is logged but the service is terminated cleanly by the service
manager. If set to <constant>kill</constant> and one of the service's processes is killed by the OOM
killer the kernel is instructed to kill all remaining processes of the service too, by setting the