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linux
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: Christian Loehle <christian.loehle@arm.com>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
authored by
Christian Loehle
and committed by
Tejun Heo
8ce8d052
70f54f61
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Documentation/scheduler/sched-ext.rst
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Documentation/scheduler/sched-ext.rst
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However, when the BPF scheduler is loaded and ``SCX_OPS_SWITCH_PARTIAL`` is
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set in ``ops->flags``, only tasks with the ``SCHED_EXT`` policy are scheduled
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by sched_ext, while tasks with ``SCHED_NORMAL``, ``SCHED_BATCH`` and
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``SCHED_IDLE`` policies are scheduled by the fair-class scheduler.
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``SCHED_IDLE`` policies are scheduled by the fair-class scheduler which has
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higher sched_class precedence than ``SCHED_EXT``.
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Terminating the sched_ext scheduler program, triggering `SysRq-S`, or
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detection of any internal error including stalled runnable tasks aborts the