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man: make it clear how systemd calculate the DefaultTasksMax.

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Actually, systemd takes the minimum of 
* a) the maximum tasks value the kernel allows on this architecture
* b) the cgroups pids_max attribute for the system
* c) the kernel's configured maximum PID value
to calculate the DefaultTasksMax. Here, kernel.thread-max should also be methioned.
This commit is contained in:
Einsler Lee
2021-01-30 11:14:35 +08:00
committed by Zbigniew Jędrzejewski-Szmek
parent 7a1fed85d7
commit 9c587d6618
1 changed files with 2 additions and 1 deletions
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3
man/systemd-system.conf.xml
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@@ -361,7 +361,8 @@
<listitem><para>Configure the default value for the per-unit <varname>TasksMax=</varname> setting. See
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details. This setting applies to all unit types that support resource control settings, with the exception
of slice units. Defaults to 15% of the sysctl setting <varname>kernel.pid_max=</varname> or root cgroup <varname>pids.max</varname>.
of slice units. Defaults to 15% of the minimum of <varname>kernel.pid_max=</varname>, <varname>kernel.threads-max=</varname>
and root cgroup <varname>pids.max</varname>.
Kernel has a default value for <varname>kernel.pid_max=</varname> and an algorithm of counting in case of more than 32 cores.
For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 4915,
but might be greater in other systems or smaller in OS containers.</para></listitem>