sched/rt: Remove unnecessary push for unfit tasks
In task_woken_rt() and switched_to_rto() we try trigger push-pull if the task is unfit. But the logic is found lacking because if the task was the only one running on the CPU, then rt_rq is not in overloaded state and won't trigger a push. The necessity of this logic was under a debate as well, a summary of the discussion can be found in the following thread: https://lore.kernel.org/lkml/20200226160247.iqvdakiqbakk2llz@e107158-lin.cambridge.arm.com/ Remove the logic for now until a better approach is agreed upon. Signed-off-by: Qais Yousef <qais.yousef@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Fixes: 804d402fb6f6 ("sched/rt: Make RT capacity-aware") Link: https://lkml.kernel.org/r/20200302132721.8353-6-qais.yousef@arm.com
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@ -2225,7 +2225,7 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
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(rq->curr->nr_cpus_allowed < 2 ||
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rq->curr->prio <= p->prio);
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if (need_to_push || !rt_task_fits_capacity(p, cpu_of(rq)))
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if (need_to_push)
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push_rt_tasks(rq);
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}
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@ -2297,10 +2297,7 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p)
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*/
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if (task_on_rq_queued(p) && rq->curr != p) {
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#ifdef CONFIG_SMP
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bool need_to_push = rq->rt.overloaded ||
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!rt_task_fits_capacity(p, cpu_of(rq));
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if (p->nr_cpus_allowed > 1 && need_to_push)
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if (p->nr_cpus_allowed > 1 && rq->rt.overloaded)
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rt_queue_push_tasks(rq);
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#endif /* CONFIG_SMP */
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if (p->prio < rq->curr->prio && cpu_online(cpu_of(rq)))
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