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sched: optimize activate_task()

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optimize activate_task() by removing update_rq_clock() from it.
(and add update_rq_clock() to all callsites of activate_task() that
did not have it before.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-08-09 11:16:51 +02:00
parent c3b64f1e4f
commit 2daa357705
1 changed files with 9 additions and 10 deletions
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19
kernel/sched.c
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@ -910,8 +910,6 @@ static int effective_prio(struct task_struct *p)
*/
static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
{
update_rq_clock(rq);
if (p->state == TASK_UNINTERRUPTIBLE)
rq->nr_uninterruptible--;
@ -1510,6 +1508,7 @@ out_set_cpu:
out_activate:
#endif /* CONFIG_SMP */
update_rq_clock(rq);
activate_task(rq, p, 1);
/*
* Sync wakeups (i.e. those types of wakeups where the waker
@ -2117,6 +2116,7 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
update_rq_clock(src_rq);
deactivate_task(src_rq, p, 0);
set_task_cpu(p, this_cpu);
__update_rq_clock(this_rq);
activate_task(this_rq, p, 0);
/*
* Note that idle threads have a prio of MAX_PRIO, for this test
@ -4207,11 +4207,10 @@ recheck:
spin_unlock_irqrestore(&p->pi_lock, flags);
goto recheck;
}
update_rq_clock(rq);
on_rq = p->se.on_rq;
if (on_rq) {
update_rq_clock(rq);
if (on_rq)
deactivate_task(rq, p, 0);
}
oldprio = p->prio;
__setscheduler(rq, p, policy, param->sched_priority);
if (on_rq) {
@ -4969,6 +4968,7 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)
}
set_task_cpu(p, dest_cpu);
if (on_rq) {
update_rq_clock(rq_dest);
activate_task(rq_dest, p, 0);
check_preempt_curr(rq_dest, p);
}
@ -6623,14 +6623,13 @@ void normalize_rt_tasks(void)
goto out_unlock;
#endif
update_rq_clock(rq);
on_rq = p->se.on_rq;
if (on_rq) {
update_rq_clock(task_rq(p));
deactivate_task(task_rq(p), p, 0);
}
if (on_rq)
deactivate_task(rq, p, 0);
__setscheduler(rq, p, SCHED_NORMAL, 0);
if (on_rq) {
activate_task(task_rq(p), p, 0);
activate_task(rq, p, 0);
resched_task(rq->curr);
}
#ifdef CONFIG_SMP