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sched_ext: switch class when preempted by higher priority scheduler

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ops.cpu_release() function, if defined, must be invoked when preempted by
a higher priority scheduler class task. This scenario was skipped in
commit f422316d74 ("sched_ext: Remove switch_class_scx()"). Let's fix
it.

Fixes: f422316d74 ("sched_ext: Remove switch_class_scx()")
Signed-off-by: Honglei Wang <jameshongleiwang@126.com>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Honglei Wang 2025-01-08 10:33:28 +08:00 committed by Tejun Heo
parent 6268d5bc10
commit 68e449d849
1 changed files with 2 additions and 1 deletions
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3
kernel/sched/ext.c
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@ -3037,7 +3037,7 @@ static void put_prev_task_scx(struct rq *rq, struct task_struct *p,
*/
if (p->scx.slice && !scx_rq_bypassing(rq)) {
dispatch_enqueue(&rq->scx.local_dsq, p, SCX_ENQ_HEAD);
return;
goto switch_class;
}
/*
@ -3054,6 +3054,7 @@ static void put_prev_task_scx(struct rq *rq, struct task_struct *p,
}
}
switch_class:
if (next && next->sched_class != &ext_sched_class)
switch_class(rq, next);
}