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Commit b40b2e8e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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sched: rt: multi level group constraints 



multi level rt constraints

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f473aa5e

kernel/sched.c

+33 −0
Original line number Original line Diff line number Diff line
@@ -8228,6 +8228,38 @@ static unsigned long to_ratio(u64 period, u64 runtime) 
	return div64_64(runtime << 16, period);

	return div64_64(runtime << 16, period);

}

}





#ifdef CONFIG_CGROUP_SCHED

static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)

{

	struct task_group *tgi, *parent = tg->parent;

	unsigned long total = 0;



	if (!parent) {

		if (global_rt_period() < period)

			return 0;



		return to_ratio(period, runtime) <

			to_ratio(global_rt_period(), global_rt_runtime());

	}



	if (ktime_to_ns(parent->rt_bandwidth.rt_period) < period)

		return 0;



	rcu_read_lock();

	list_for_each_entry_rcu(tgi, &parent->children, siblings) {

		if (tgi == tg)

			continue;



		total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),

				tgi->rt_bandwidth.rt_runtime);

	}

	rcu_read_unlock();



	return total + to_ratio(period, runtime) <

		to_ratio(ktime_to_ns(parent->rt_bandwidth.rt_period),

				parent->rt_bandwidth.rt_runtime);

}

#elif defined CONFIG_USER_SCHED

static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)

static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)

{

{

	struct task_group *tgi;

	struct task_group *tgi;
@@ -8247,6 +8279,7 @@ static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime) 




	return total + to_ratio(period, runtime) < global_ratio;

	return total + to_ratio(period, runtime) < global_ratio;

}

}

#endif





/* Must be called with tasklist_lock held */

/* Must be called with tasklist_lock held */

static inline int tg_has_rt_tasks(struct task_group *tg)

static inline int tg_has_rt_tasks(struct task_group *tg)