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sched: add set_curr_task() calls

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p->sched_class->set_curr_task() has to be called before 
activate_task()/enqueue_task() in rt_mutex_setprio(), 
sched_setschedule() and sched_move_task() in order to set up 
'cfs_rq->curr'. The logic of enqueueing depends on whether a task to be 
inserted is 'current' or not.

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Dmitry Adamushko 2007-10-15 17:00:07 +02:00 committed by Ingo Molnar
parent d02e5ed8d5
commit 7074badbcb
1 changed files with 13 additions and 9 deletions
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22
kernel/sched.c
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@ -3915,8 +3915,8 @@ EXPORT_SYMBOL(sleep_on_timeout);
*/
void rt_mutex_setprio(struct task_struct *p, int prio)
{
int oldprio, on_rq, running;
unsigned long flags;
int oldprio, on_rq;
struct rq *rq;
BUG_ON(prio < 0 || prio > MAX_PRIO);
@ -3926,9 +3926,10 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
oldprio = p->prio;
on_rq = p->se.on_rq;
running = task_running(rq, p);
if (on_rq) {
dequeue_task(rq, p, 0);
if (task_running(rq, p))
if (running)
p->sched_class->put_prev_task(rq, p);
}
@ -3940,16 +3941,17 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
p->prio = prio;
if (on_rq) {
if (running)
p->sched_class->set_curr_task(rq);
enqueue_task(rq, p, 0);
/*
* Reschedule if we are currently running on this runqueue and
* our priority decreased, or if we are not currently running on
* this runqueue and our priority is higher than the current's
*/
if (task_running(rq, p)) {
if (running) {
if (p->prio > oldprio)
resched_task(rq->curr);
p->sched_class->set_curr_task(rq);
} else {
check_preempt_curr(rq, p);
}
@ -4153,7 +4155,7 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
int sched_setscheduler(struct task_struct *p, int policy,
struct sched_param *param)
{
int retval, oldprio, oldpolicy = -1, on_rq;
int retval, oldprio, oldpolicy = -1, on_rq, running;
unsigned long flags;
struct rq *rq;
@ -4235,24 +4237,26 @@ recheck:
}
update_rq_clock(rq);
on_rq = p->se.on_rq;
running = task_running(rq, p);
if (on_rq) {
deactivate_task(rq, p, 0);
if (task_running(rq, p))
if (running)
p->sched_class->put_prev_task(rq, p);
}
oldprio = p->prio;
__setscheduler(rq, p, policy, param->sched_priority);
if (on_rq) {
if (running)
p->sched_class->set_curr_task(rq);
activate_task(rq, p, 0);
/*
* Reschedule if we are currently running on this runqueue and
* our priority decreased, or if we are not currently running on
* this runqueue and our priority is higher than the current's
*/
if (task_running(rq, p)) {
if (running) {
if (p->prio > oldprio)
resched_task(rq->curr);
p->sched_class->set_curr_task(rq);
} else {
check_preempt_curr(rq, p);
}
@ -6861,9 +6865,9 @@ static void sched_move_task(struct container_subsys *ss, struct container *cont,
set_task_cfs_rq(tsk);
if (on_rq) {
enqueue_task(rq, tsk, 0);
if (unlikely(running))
tsk->sched_class->set_curr_task(rq);
enqueue_task(rq, tsk, 0);
}
done: