Commit d94a9df4 authored by Qais Yousef's avatar Qais Yousef Committed by Ingo Molnar

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: default avatarQais Yousef <qais.yousef@arm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Fixes: 804d402f ("sched/rt: Make RT capacity-aware")
Link: https://lkml.kernel.org/r/20200302132721.8353-6-qais.yousef@arm.com
parent 98ca645f
...@@ -2225,7 +2225,7 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p) ...@@ -2225,7 +2225,7 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
(rq->curr->nr_cpus_allowed < 2 || (rq->curr->nr_cpus_allowed < 2 ||
rq->curr->prio <= p->prio); rq->curr->prio <= p->prio);
if (need_to_push || !rt_task_fits_capacity(p, cpu_of(rq))) if (need_to_push)
push_rt_tasks(rq); push_rt_tasks(rq);
} }
...@@ -2297,10 +2297,7 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p) ...@@ -2297,10 +2297,7 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p)
*/ */
if (task_on_rq_queued(p) && rq->curr != p) { if (task_on_rq_queued(p) && rq->curr != p) {
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
bool need_to_push = rq->rt.overloaded || if (p->nr_cpus_allowed > 1 && rq->rt.overloaded)
!rt_task_fits_capacity(p, cpu_of(rq));
if (p->nr_cpus_allowed > 1 && need_to_push)
rt_queue_push_tasks(rq); rt_queue_push_tasks(rq);
#endif /* CONFIG_SMP */ #endif /* CONFIG_SMP */
if (p->prio < rq->curr->prio && cpu_online(cpu_of(rq))) if (p->prio < rq->curr->prio && cpu_online(cpu_of(rq)))
......
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