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sched: rework enqueue/dequeue_entity() to get rid of set_curr_task()

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rework enqueue/dequeue_entity() to get rid of 
sched_class::set_curr_task(). This simplifies sched_setscheduler(), 
rt_mutex_setprio() and sched_move_tasks().

   text    data     bss     dec     hex filename
  24330    2734      20   27084    69cc sched.o.before
  24233    2730      20   26983    6967 sched.o.after

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.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 17:00:08 +02:00
committed by Ingo Molnar
parent 4530d7ab0f
commit f6b53205e1
5 changed files with 35 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
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);
@@ -3926,12 +3926,8 @@ 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) {
if (on_rq)
dequeue_task(rq, p, 0);
if (running)
p->sched_class->put_prev_task(rq, p);
}
if (rt_prio(prio))
p->sched_class = &rt_sched_class;
@@ -3941,15 +3937,13 @@ 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 (running) {
if (task_running(rq, p)) {
if (p->prio > oldprio)
resched_task(rq->curr);
} else {
@@ -4155,7 +4149,7 @@ __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, running;
int retval, oldprio, oldpolicy = -1, on_rq;
unsigned long flags;
struct rq *rq;
@@ -4237,24 +4231,20 @@ recheck:
}
update_rq_clock(rq);
on_rq = p->se.on_rq;
running = task_running(rq, p);
if (on_rq) {
if (on_rq)
deactivate_task(rq, p, 0);
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 (running) {
if (task_running(rq, p)) {
if (p->prio > oldprio)
resched_task(rq->curr);
} else {
@@ -6855,19 +6845,13 @@ static void sched_move_task(struct container_subsys *ss, struct container *cont,
running = task_running(rq, tsk);
on_rq = tsk->se.on_rq;
if (on_rq) {
if (on_rq)
dequeue_task(rq, tsk, 0);
if (unlikely(running))
tsk->sched_class->put_prev_task(rq, tsk);
}
set_task_cfs_rq(tsk);
if (on_rq) {
if (unlikely(running))
tsk->sched_class->set_curr_task(rq);
if (on_rq)
enqueue_task(rq, tsk, 0);
}
done:
task_rq_unlock(rq, &flags);