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sched: Clean up ttwu() rq locking

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Since set_task_clock() doesn't rely on rq->clock anymore we can simplyfy
the mess in ttwu().

Optimize things a bit by not fiddling with the IRQ state there.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-11-27 15:44:43 +01:00 committed by Ingo Molnar
parent 5afcdab706
commit ab19cb2331
1 changed files with 5 additions and 8 deletions
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13
kernel/sched.c
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@ -2371,17 +2371,14 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
if (task_contributes_to_load(p))
rq->nr_uninterruptible--;
p->state = TASK_WAKING;
task_rq_unlock(rq, &flags);
__task_rq_unlock(rq);
cpu = select_task_rq(p, SD_BALANCE_WAKE, wake_flags);
if (cpu != orig_cpu) {
local_irq_save(flags);
rq = cpu_rq(cpu);
update_rq_clock(rq);
if (cpu != orig_cpu)
set_task_cpu(p, cpu);
local_irq_restore(flags);
}
rq = task_rq_lock(p, &flags);
rq = __task_rq_lock(p);
update_rq_clock(rq);
WARN_ON(p->state != TASK_WAKING);
cpu = task_cpu(p);