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sched: rt: multi level group constraints
multi level rt constraints Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -8228,6 +8228,38 @@ static unsigned long to_ratio(u64 period, u64 runtime)
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return div64_64(runtime << 16, period);
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}
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#ifdef CONFIG_CGROUP_SCHED
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static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
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{
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struct task_group *tgi, *parent = tg->parent;
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unsigned long total = 0;
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if (!parent) {
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if (global_rt_period() < period)
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return 0;
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return to_ratio(period, runtime) <
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to_ratio(global_rt_period(), global_rt_runtime());
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}
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if (ktime_to_ns(parent->rt_bandwidth.rt_period) < period)
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return 0;
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rcu_read_lock();
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list_for_each_entry_rcu(tgi, &parent->children, siblings) {
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if (tgi == tg)
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continue;
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total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),
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tgi->rt_bandwidth.rt_runtime);
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}
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rcu_read_unlock();
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return total + to_ratio(period, runtime) <
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to_ratio(ktime_to_ns(parent->rt_bandwidth.rt_period),
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parent->rt_bandwidth.rt_runtime);
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}
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#elif defined CONFIG_USER_SCHED
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static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
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{
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struct task_group *tgi;
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@ -8247,6 +8279,7 @@ static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
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return total + to_ratio(period, runtime) < global_ratio;
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}
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#endif
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/* Must be called with tasklist_lock held */
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static inline int tg_has_rt_tasks(struct task_group *tg)
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