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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>
This commit is contained in:
Peter Zijlstra 2008-04-19 19:45:00 +02:00 committed by Ingo Molnar
parent f473aa5e02
commit b40b2e8eb5
1 changed files with 33 additions and 0 deletions
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33
kernel/sched.c
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@ -8228,6 +8228,38 @@ static unsigned long to_ratio(u64 period, u64 runtime)
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)
{
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;
}
#endif
/* Must be called with tasklist_lock held */
static inline int tg_has_rt_tasks(struct task_group *tg)