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sched/deadline: Ignore special tasks when rebuilding domains

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SCHED_DEADLINE special tasks get a fake bandwidth that is only used to
make sure sleeping and priority inheritance 'work', but it is ignored
for runtime enforcement and admission control.

Be consistent with it also when rebuilding root domains.

Fixes: 53916d5fd3 ("sched/deadline: Check bandwidth overflow earlier for hotplug")
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Waiman Long <longman@redhat.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Link: https://lore.kernel.org/r/20250313170011.357208-2-juri.lelli@redhat.com
This commit is contained in:
Juri Lelli 2025-03-13 18:00:04 +01:00 committed by Peter Zijlstra
parent 3bffa47a02
commit f6147af176
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/deadline.c
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@ -2956,7 +2956,7 @@ void dl_add_task_root_domain(struct task_struct *p)
struct dl_bw *dl_b;
raw_spin_lock_irqsave(&p->pi_lock, rf.flags);
if (!dl_task(p)) {
if (!dl_task(p) || dl_entity_is_special(&p->dl)) {
raw_spin_unlock_irqrestore(&p->pi_lock, rf.flags);
return;
}