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sched: rt throttling vs no_hz

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We need to teach no_hz about the rt throttling because its tick driven.

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
2008-01-25 21:08:31 +01:00
committed by Ingo Molnar
parent 614ee1f61f
commit 48d5e25821
4 changed files with 45 additions and 15 deletions
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30
kernel/sched_rt.c
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@@ -175,7 +175,11 @@ static int sched_rt_ratio_exceeded(struct rt_rq *rt_rq)
ratio = (period * rt_ratio) >> SCHED_RT_FRAC_SHIFT;
if (rt_rq->rt_time > ratio) {
struct rq *rq = rq_of_rt_rq(rt_rq);
rq->rt_throttled = 1;
rt_rq->rt_throttled = 1;
sched_rt_ratio_dequeue(rt_rq);
return 1;
}
@@ -183,18 +187,6 @@ static int sched_rt_ratio_exceeded(struct rt_rq *rt_rq)
return 0;
}
static void __update_sched_rt_period(struct rt_rq *rt_rq, u64 period)
{
unsigned long rt_ratio = sched_rt_ratio(rt_rq);
u64 ratio = (period * rt_ratio) >> SCHED_RT_FRAC_SHIFT;
rt_rq->rt_time -= min(rt_rq->rt_time, ratio);
if (rt_rq->rt_throttled) {
rt_rq->rt_throttled = 0;
sched_rt_ratio_enqueue(rt_rq);
}
}
static void update_sched_rt_period(struct rq *rq)
{
struct rt_rq *rt_rq;
@@ -204,8 +196,18 @@ static void update_sched_rt_period(struct rq *rq)
period = (u64)sysctl_sched_rt_period * NSEC_PER_MSEC;
rq->rt_period_expire += period;
for_each_leaf_rt_rq(rt_rq, rq)
__update_sched_rt_period(rt_rq, period);
for_each_leaf_rt_rq(rt_rq, rq) {
unsigned long rt_ratio = sched_rt_ratio(rt_rq);
u64 ratio = (period * rt_ratio) >> SCHED_RT_FRAC_SHIFT;
rt_rq->rt_time -= min(rt_rq->rt_time, ratio);
if (rt_rq->rt_throttled) {
rt_rq->rt_throttled = 0;
sched_rt_ratio_enqueue(rt_rq);
}
}
rq->rt_throttled = 0;
}
}