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sched: rt: fix the bandwidth contraint computations

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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Daniel K." <dk@uw.no>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-06-19 14:22:27 +02:00 committed by Ingo Molnar
parent eff6549b95
commit 10b612f440
1 changed files with 8 additions and 3 deletions
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11
kernel/sched.c
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@ -8419,7 +8419,7 @@ static unsigned long to_ratio(u64 period, u64 runtime)
#ifdef CONFIG_CGROUP_SCHED #ifdef CONFIG_CGROUP_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, *parent = tg ? tg->parent : NULL; struct task_group *tgi, *parent = tg->parent;
unsigned long total = 0; unsigned long total = 0;
if (!parent) { if (!parent) {
@ -8443,7 +8443,7 @@ static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
} }
rcu_read_unlock(); rcu_read_unlock();
return total + to_ratio(period, runtime) < return total + to_ratio(period, runtime) <=
to_ratio(ktime_to_ns(parent->rt_bandwidth.rt_period), to_ratio(ktime_to_ns(parent->rt_bandwidth.rt_period),
parent->rt_bandwidth.rt_runtime); parent->rt_bandwidth.rt_runtime);
} }
@ -8560,10 +8560,15 @@ long sched_group_rt_period(struct task_group *tg)
static int sched_rt_global_constraints(void) static int sched_rt_global_constraints(void)
{ {
struct task_group *tg = &root_task_group;
u64 rt_runtime, rt_period;
int ret = 0; int ret = 0;
rt_period = ktime_to_ns(tg->rt_bandwidth.rt_period);
rt_runtime = tg->rt_bandwidth.rt_runtime;
mutex_lock(&rt_constraints_mutex); mutex_lock(&rt_constraints_mutex);
if (!__rt_schedulable(NULL, 1, 0)) if (!__rt_schedulable(tg, rt_period, rt_runtime))
ret = -EINVAL; ret = -EINVAL;
mutex_unlock(&rt_constraints_mutex); mutex_unlock(&rt_constraints_mutex);