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

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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: Tejun Heo <tj@kernel.org>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: David Vernet <void@manifault.com>
This commit is contained in:
Tejun Heo 2024-08-06 09:40:10 -10:00
parent 11cc374f46
commit cd01449268
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/core.c
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@ -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