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sched: Fix wake_affine() vs RT tasks

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Mike reports that since e9e9250b (sched: Scale down cpu_power due to RT
tasks), wake_affine() goes funny on RT tasks due to them still having a
!0 weight and wake_affine() still subtracts that from the rq weight.

Since nobody should be using se->weight for RT tasks, set the value to
zero. Also, since we now use ->cpu_power to normalize rq weights to
account for RT cpu usage, add that factor into the imbalance computation.

Reported-by: Mike Galbraith <efault@gmx.de>
Tested-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1275316109.27810.22969.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-05-31 12:37:30 +02:00
committed by Ingo Molnar
parent 54e88fad22
commit e51fd5e22e
2 changed files with 22 additions and 24 deletions
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24
kernel/sched.c
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@@ -544,6 +544,8 @@ struct rq {
struct root_domain *rd;
struct sched_domain *sd;
unsigned long cpu_power;
unsigned char idle_at_tick;
/* For active balancing */
int post_schedule;
@@ -1499,24 +1501,9 @@ static unsigned long target_load(int cpu, int type)
return max(rq->cpu_load[type-1], total);
}
static struct sched_group *group_of(int cpu)
{
struct sched_domain *sd = rcu_dereference_sched(cpu_rq(cpu)->sd);
if (!sd)
return NULL;
return sd->groups;
}
static unsigned long power_of(int cpu)
{
struct sched_group *group = group_of(cpu);
if (!group)
return SCHED_LOAD_SCALE;
return group->cpu_power;
return cpu_rq(cpu)->cpu_power;
}
static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
@@ -1854,8 +1841,8 @@ static void dec_nr_running(struct rq *rq)
static void set_load_weight(struct task_struct *p)
{
if (task_has_rt_policy(p)) {
p->se.load.weight = prio_to_weight[0] * 2;
p->se.load.inv_weight = prio_to_wmult[0] >> 1;
p->se.load.weight = 0;
p->se.load.inv_weight = WMULT_CONST;
return;
}
@@ -7605,6 +7592,7 @@ void __init sched_init(void)
#ifdef CONFIG_SMP
rq->sd = NULL;
rq->rd = NULL;
rq->cpu_power = SCHED_LOAD_SCALE;
rq->post_schedule = 0;
rq->active_balance = 0;
rq->next_balance = jiffies;