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sched_ext: Clarify ops.select_cpu() for single-CPU tasks

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Update ops.select_cpu() documentation to clarify that this method is not
called for tasks that are restricted to run on a single CPU, as these
tasks do not have the option to select a different CPU.

Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Andrea Righi 2024-10-23 13:19:07 +02:00 committed by Tejun Heo
parent 21b8964826
commit b452ae4d20
1 changed files with 5 additions and 0 deletions
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5
kernel/sched/ext.c
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@ -217,6 +217,11 @@ struct sched_ext_ops {
* is dispatched, the ops.enqueue() callback will be skipped. Finally,
* if @p is dispatched to SCX_DSQ_LOCAL, it will be dispatched to the
* local DSQ of whatever CPU is returned by this callback.
*
* Note that select_cpu() is never called for tasks that can only run
* on a single CPU or tasks with migration disabled, as they don't have
* the option to select a different CPU. See select_task_rq() for
* details.
*/
s32 (*select_cpu)(struct task_struct *p, s32 prev_cpu, u64 wake_flags);