sched_ext: Don't trigger ops.quiescent/runnable() on migrations

A task moving across CPUs should not trigger quiescent/runnable task state events as the task is staying runnable the whole time and just stopping and then starting on different CPUs. Suppress quiescent/runnable task state events if task_on_rq_migrating(). Signed-off-by: Tejun Heo <[email protected]> Suggested-by: David Vernet <[email protected]> Cc: Daniel Hodges <[email protected]> Cc: Changwoo Min <[email protected]> Cc: Andrea Righi <[email protected]> Cc: Dan Schatzberg <[email protected]> Signed-off-by: Tejun Heo <[email protected]> (cherry picked from commit 513ed0c)
sched-ext · Sep 11, 2024 · 08d3923 · 08d3923
1 parent 7a726f7
commit 08d3923
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
@@ -2078,7 +2078,7 @@ static void enqueue_task_scx(struct rq *rq, struct task_struct *p, int enq_flags
 	rq->scx.nr_running++;
 	add_nr_running(rq, 1);
 
-	if (SCX_HAS_OP(runnable))
+	if (SCX_HAS_OP(runnable) && !task_on_rq_migrating(p))
 		SCX_CALL_OP_TASK(SCX_KF_REST, runnable, p, enq_flags);
 
 	if (enq_flags & SCX_ENQ_WAKEUP)
@@ -2162,7 +2162,7 @@ static void dequeue_task_scx(struct rq *rq, struct task_struct *p, int deq_flags
 		SCX_CALL_OP_TASK(SCX_KF_REST, stopping, p, false);
 	}
 
-	if (SCX_HAS_OP(quiescent))
+	if (SCX_HAS_OP(quiescent) && !task_on_rq_migrating(p))
 		SCX_CALL_OP_TASK(SCX_KF_REST, quiescent, p, deq_flags);
 
 	if (deq_flags & SCX_DEQ_SLEEP)