Commit 8ce8d052 authored by Christian Loehle's avatar Christian Loehle Committed by Tejun Heo
Browse files

sched_ext: Documentation: Mention scheduling class precedence 



Mention the scheduling class precedence of fair and sched_ext to
clear up how sched_ext partial mode works.

Signed-off-by: default avatarChristian Loehle <christian.loehle@arm.com>
Acked-by: default avatarAndrea Righi <arighi@nvidia.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 70f54f61

Documentation/scheduler/sched-ext.rst

+2 −1
Original line number Diff line number Diff line
@@ -58,7 +58,8 @@ in ``ops->flags``, all ``SCHED_NORMAL``, ``SCHED_BATCH``, ``SCHED_IDLE``, and 
However, when the BPF scheduler is loaded and ``SCX_OPS_SWITCH_PARTIAL`` is

set in ``ops->flags``, only tasks with the ``SCHED_EXT`` policy are scheduled

by sched_ext, while tasks with ``SCHED_NORMAL``, ``SCHED_BATCH`` and

``SCHED_IDLE`` policies are scheduled by the fair-class scheduler.

``SCHED_IDLE`` policies are scheduled by the fair-class scheduler which has

higher sched_class precedence than ``SCHED_EXT``.



Terminating the sched_ext scheduler program, triggering `SysRq-S`, or

detection of any internal error including stalled runnable tasks aborts the