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sched: Use replace normalize_task() with __sched_setscheduler() 

Reduce duplicate logic; normalize_task() is a simplified version of
__sched_setscheduler(). Parametrize the difference and collapse.

This reduces the amount of check_class_changed() sites.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: ktkhai@parallels.com
Cc: rostedt@goodmis.org
Cc: juri.lelli@gmail.com
Cc: pang.xunlei@linaro.org
Cc: oleg@redhat.com
Cc: wanpeng.li@linux.intel.com
Cc: umgwanakikbuti@gmail.com
Link: http://lkml.kernel.org/r/20150611124742.532642391@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Peter Zijlstra 2015-06-11 14:46:38 +02:00 committed by Thomas Gleixner
parent e3fca9e7cb
commit dbc7f069b9
1 changed files with 24 additions and 43 deletions
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67
kernel/sched/core.c
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@ -3438,7 +3438,7 @@ static bool dl_param_changed(struct task_struct *p,
static int __sched_setscheduler(struct task_struct *p,
const struct sched_attr *attr,
bool user)
bool user, bool pi)
{
int newprio = dl_policy(attr->sched_policy) ? MAX_DL_PRIO - 1 :
MAX_RT_PRIO - 1 - attr->sched_priority;
@ -3624,18 +3624,20 @@ change:
p->sched_reset_on_fork = reset_on_fork;
oldprio = p->prio;
/*
* Take priority boosted tasks into account. If the new
* effective priority is unchanged, we just store the new
* normal parameters and do not touch the scheduler class and
* the runqueue. This will be done when the task deboost
* itself.
*/
new_effective_prio = rt_mutex_get_effective_prio(p, newprio);
if (new_effective_prio == oldprio) {
__setscheduler_params(p, attr);
task_rq_unlock(rq, p, &flags);
return 0;
if (pi) {
/*
* Take priority boosted tasks into account. If the new
* effective priority is unchanged, we just store the new
* normal parameters and do not touch the scheduler class and
* the runqueue. This will be done when the task deboost
* itself.
*/
new_effective_prio = rt_mutex_get_effective_prio(p, newprio);
if (new_effective_prio == oldprio) {
__setscheduler_params(p, attr);
task_rq_unlock(rq, p, &flags);
return 0;
}
}
queued = task_on_rq_queued(p);
@ -3646,7 +3648,7 @@ change:
put_prev_task(rq, p);
prev_class = p->sched_class;
__setscheduler(rq, p, attr, true);
__setscheduler(rq, p, attr, pi);
if (running)
p->sched_class->set_curr_task(rq);
@ -3661,7 +3663,8 @@ change:
check_class_changed(rq, p, prev_class, oldprio);
task_rq_unlock(rq, p, &flags);
rt_mutex_adjust_pi(p);
if (pi)
rt_mutex_adjust_pi(p);
return 0;
}
@ -3682,7 +3685,7 @@ static int _sched_setscheduler(struct task_struct *p, int policy,
attr.sched_policy = policy;
}
return __sched_setscheduler(p, &attr, check);
return __sched_setscheduler(p, &attr, check, true);
}
/**
* sched_setscheduler - change the scheduling policy and/or RT priority of a thread.
@ -3703,7 +3706,7 @@ EXPORT_SYMBOL_GPL(sched_setscheduler);
int sched_setattr(struct task_struct *p, const struct sched_attr *attr)
{
return __sched_setscheduler(p, attr, true);
return __sched_setscheduler(p, attr, true, true);
}
EXPORT_SYMBOL_GPL(sched_setattr);
@ -7361,32 +7364,12 @@ EXPORT_SYMBOL(___might_sleep);
#endif
#ifdef CONFIG_MAGIC_SYSRQ
static void normalize_task(struct rq *rq, struct task_struct *p)
{
const struct sched_class *prev_class = p->sched_class;
struct sched_attr attr = {
.sched_policy = SCHED_NORMAL,
};
int old_prio = p->prio;
int queued;
queued = task_on_rq_queued(p);
if (queued)
dequeue_task(rq, p, 0);
__setscheduler(rq, p, &attr, false);
if (queued) {
enqueue_task(rq, p, 0);
resched_curr(rq);
}
check_class_changed(rq, p, prev_class, old_prio);
}
void normalize_rt_tasks(void)
{
struct task_struct *g, *p;
unsigned long flags;
struct rq *rq;
struct sched_attr attr = {
.sched_policy = SCHED_NORMAL,
};
read_lock(&tasklist_lock);
for_each_process_thread(g, p) {
@ -7413,9 +7396,7 @@ void normalize_rt_tasks(void)
continue;
}
rq = task_rq_lock(p, &flags);
normalize_task(rq, p);
task_rq_unlock(rq, p, &flags);
__sched_setscheduler(p, &attr, false, false);
}
read_unlock(&tasklist_lock);
}