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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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23
kernel/sched.c
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@@ -442,6 +442,7 @@ struct rq {
struct cfs_rq cfs;
struct rt_rq rt;
u64 rt_period_expire;
int rt_throttled;
#ifdef CONFIG_FAIR_GROUP_SCHED
/* list of leaf cfs_rq on this cpu: */
@@ -594,6 +595,23 @@ static void update_rq_clock(struct rq *rq)
#define task_rq(p) cpu_rq(task_cpu(p))
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
unsigned long rt_needs_cpu(int cpu)
{
struct rq *rq = cpu_rq(cpu);
u64 delta;
if (!rq->rt_throttled)
return 0;
if (rq->clock > rq->rt_period_expire)
return 1;
delta = rq->rt_period_expire - rq->clock;
do_div(delta, NSEC_PER_SEC / HZ);
return (unsigned long)delta;
}
/*
* Tunables that become constants when CONFIG_SCHED_DEBUG is off:
*/
@@ -7102,9 +7120,11 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
/* delimiter for bitsearch: */
__set_bit(MAX_RT_PRIO, array->bitmap);
#if defined CONFIG_SMP || defined CONFIG_FAIR_GROUP_SCHED
rt_rq->highest_prio = MAX_RT_PRIO;
#endif
#ifdef CONFIG_SMP
rt_rq->rt_nr_migratory = 0;
rt_rq->highest_prio = MAX_RT_PRIO;
rt_rq->overloaded = 0;
#endif
@@ -7191,6 +7211,7 @@ void __init sched_init(void)
&per_cpu(init_sched_rt_entity, i), i, 1);
#endif
rq->rt_period_expire = 0;
rq->rt_throttled = 0;
for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
rq->cpu_load[j] = 0;