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sched: push RT tasks from overloaded CPUs

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This patch adds pushing of overloaded RT tasks from a runqueue that is
having tasks (most likely RT tasks) added to the run queue.

TODO: We don't cover the case of waking of new RT tasks (yet).

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-01-25 21:08:07 +01:00 committed by Ingo Molnar
parent f65eda4f78
commit 4642dafdf9
2 changed files with 11 additions and 0 deletions
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1
kernel/sched.c
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@ -1710,6 +1710,7 @@ out_activate:
out_running:
p->state = TASK_RUNNING;
wakeup_balance_rt(rq, p);
out:
task_rq_unlock(rq, &flags);

10
kernel/sched_rt.c
View file

@ -558,6 +558,15 @@ static void schedule_tail_balance_rt(struct rq *rq)
}
}
static void wakeup_balance_rt(struct rq *rq, struct task_struct *p)
{
if (unlikely(rt_task(p)) &&
!task_running(rq, p) &&
(p->prio >= rq->curr->prio))
push_rt_tasks(rq);
}
/*
* Load-balancing iterator. Note: while the runqueue stays locked
* during the whole iteration, the current task might be
@ -665,6 +674,7 @@ move_one_task_rt(struct rq *this_rq, int this_cpu, struct rq *busiest,
#else /* CONFIG_SMP */
# define schedule_tail_balance_rt(rq) do { } while (0)
# define schedule_balance_rt(rq, prev) do { } while (0)
# define wakeup_balance_rt(rq, p) do { } while (0)
#endif /* CONFIG_SMP */
static void task_tick_rt(struct rq *rq, struct task_struct *p)