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| author | Mike Galbraith <efault@gmx.de> | 2008-12-16 08:45:30 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-16 09:45:38 +0100 |
| commit | 03e89e4574a680af15f59329b061f35d9813aff4 (patch) | |
| tree | 2cf03e33021fbf8cf2aaf6ce99314eb45ed34dbc /kernel/sched.c | |
| parent | d65bd5ecb2bd166cea4952a59b7e16cc3ad6ef6c (diff) | |
| download | lwn-03e89e4574a680af15f59329b061f35d9813aff4.tar.gz lwn-03e89e4574a680af15f59329b061f35d9813aff4.zip | |
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 <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index ad7b93be5691..88215066efae 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; |