From 03e89e4574a680af15f59329b061f35d9813aff4 Mon Sep 17 00:00:00 2001 From: Mike Galbraith Date: Tue, 16 Dec 2008 08:45:30 +0100 Subject: sched: fix wakeup preemption clock Impact: sharpen the wakeup-granularity to always be against current scheduler time It was possible to do the preemption check against an old time stamp. Signed-off-by: Mike Galbraith Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar --- kernel/sched.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel/sched.c') diff --git a/kernel/sched.c b/kernel/sched.c index ad7b93be569..88215066efa 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2266,6 +2266,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync) smp_wmb(); rq = task_rq_lock(p, &flags); + update_rq_clock(rq); old_state = p->state; if (!(old_state & state)) goto out; @@ -2323,7 +2324,6 @@ out_activate: schedstat_inc(p, se.nr_wakeups_local); else schedstat_inc(p, se.nr_wakeups_remote); - update_rq_clock(rq); activate_task(rq, p, 1); success = 1; -- cgit v1.2.3