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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-01-25 20:08:31 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 20:08:31 (GMT) |
commit | 48d5e258216f1c7713633439beb98a38c7290649 (patch) | |
tree | 6f8c98785015d56337e87ed56b23d39feeeaf846 /kernel/sched.c | |
parent | 614ee1f61f667b02165c1ae0c1357048dc6d94a0 (diff) | |
download | linux-48d5e258216f1c7713633439beb98a38c7290649.tar.xz |
sched: rt throttling vs no_hz
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>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r-- | kernel/sched.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 5ea2c53..22712b2 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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; |