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sched: sync wakeups preempt too 

make sure sync wakeups preempt too - the scheduler will not
overschedule as we've got various throttles against that.
As a result, sync wakeups can be used more widely in the kernel
(to signal wakeup affinity between tasks), and no arbitrary
latencies will be introduced either.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:20 +02:00
parent 71e20f1873
commit 9c63d9c021
1 changed files with 1 additions and 10 deletions
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11
kernel/sched.c
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@ -1596,16 +1596,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
schedstat_inc(p, se.nr_wakeups_remote);
update_rq_clock(rq);
activate_task(rq, p, 1);
/*
* Sync wakeups (i.e. those types of wakeups where the waker
* has indicated that it will leave the CPU in short order)
* don't trigger a preemption, if the woken up task will run on
* this cpu. (in this case the 'I will reschedule' promise of
* the waker guarantees that the freshly woken up task is going
* to be considered on this CPU.)
*/
if (!sync || rq->curr == rq->idle)
check_preempt_curr(rq, p);
check_preempt_curr(rq, p);
success = 1;
out_running: