Commit cd014492 authored by Tejun Heo's avatar Tejun Heo
Browse files

sched_ext: Add scx_enabled() test to @start_class promotion in put_prev_task_balance() 



SCX needs its balance() invoked even when waking up from a lower priority
sched class (idle) and put_prev_task_balance() thus has the logic to promote
@start_class if it's lower than ext_sched_class. This is only needed when
SCX is enabled. Add scx_enabled() test to avoid unnecessary overhead when
SCX is disabled.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Suggested-by: default avatarPeter Zijlstra <peterz@infradead.org>
Acked-by: default avatarDavid Vernet <void@manifault.com>
parent 11cc374f

kernel/sched/core.c

+1 −1
Original line number Diff line number Diff line
@@ -5867,7 +5867,7 @@ static void put_prev_task_balance(struct rq *rq, struct task_struct *prev, 
	 * when waking up from SCHED_IDLE. If @start_class is below SCX, start

	 * from SCX instead.

	 */

	if (sched_class_above(&ext_sched_class, start_class))

	if (scx_enabled() && sched_class_above(&ext_sched_class, start_class))

		start_class = &ext_sched_class;

#endif