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Commit 4642dafd authored by Steven Rostedt's avatar Steven Rostedt Committed by Ingo Molnar
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sched: push RT tasks from overloaded CPUs 



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: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f65eda4f

kernel/sched.c

+1 −0
Original line number Diff line number Diff line
@@ -1710,6 +1710,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync) 


out_running:

	p->state = TASK_RUNNING;

	wakeup_balance_rt(rq, p);

out:

	task_rq_unlock(rq, &flags);

kernel/sched_rt.c

+10 −0
Original line number Diff line number Diff line
@@ -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)