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>
---
kernel/sched/ext.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 145677c6159c..b948fd96c29a 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -222,6 +222,11 @@ 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);
--
2.47.0