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process-util: Add support SCHED_EXT scheduling policy

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Allow CPUSchedulingPolicy to be set to "ext". SCHED_EXT is a new
scheduling policy in Linux v6.12 that allows processes to be scheduled
using custom BPF schedulers instead of the default in-kernel ones.

Selectively setting the SCHED_EXT policy is useful for systems running
in "partial mode" where not all processes are run using a custom
scheduler.

Fallback to SCHED_OTHER and print an error message for systems where
SCHED_EXT isn't available.
This commit is contained in:
Matt Fleming
2025-12-20 18:31:55 +01:00
committed by Mike Yuan
parent 84dcbc3fd2
commit 4dcbfbb1ad
9 changed files with 69 additions and 10 deletions
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man/systemd.exec.xml
+1 -1
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@@ -1326,7 +1326,7 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
<term><varname>CPUSchedulingPolicy=</varname></term>
<listitem><para>Sets the CPU scheduling policy for executed processes. Takes one of <option>other</option>,
<option>batch</option>, <option>idle</option>, <option>fifo</option> or <option>rr</option>. See
<option>batch</option>, <option>idle</option>, <option>fifo</option>, <option>rr</option> or <option>ext</option>. See
<citerefentry project='man-pages'><refentrytitle>sched_setscheduler</refentrytitle><manvolnum>2</manvolnum></citerefentry> for
details.</para></listitem>
</varlistentry>