man: clarify DefaultTasksMax doc
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<listitem><para>Configure the default value for the per-unit <varname>TasksMax=</varname> setting. See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details. This setting applies to all unit types that support resource control settings, with the exception
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of slice units. Defaults to 15%, which equals 4915 with the kernel's defaults on the host, but might be smaller
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in OS containers.</para></listitem>
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of slice units. Defaults to 15% of the sysctl setting <varname>kernel.pid_max=</varname> or root cgroup <varname>pids.max</varname>.
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Kernel has a default value for <varname>kernel.pid_max=</varname> and an algorithm of counting in case of more than 32 cores.
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For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 4915,
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but might be greater in other systems or smaller in OS containers.</para></listitem>
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</varlistentry>
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<varlistentry>
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