From: Ingo Molnar Date: Mon, 15 Oct 2007 15:00:20 +0000 (+0200) Subject: sched: sync wakeups preempt too X-Git-Tag: v2.6.24-rc1~1289^2 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=9c63d9c021f375a2708ad79043d6f4dd1291a085;p=linux.git 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 --- diff --git a/kernel/sched.c b/kernel/sched.c index 7fd343462597..bba57adb9504 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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: