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sched: Fix nr_uninterruptible count 

The cpuload calculation in calc_load_account_active() assumes
rq->nr_uninterruptible will not change on an offline cpu after
migrate_nr_uninterruptible(). However the recent migrate on wakeup
changes broke that and would result in decrementing the offline cpu's
rq->nr_uninterruptible.

Fix this by accounting the nr_uninterruptible on the waking cpu.

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 2010-03-26 12:22:14 +01:00 committed by Ingo Molnar
parent 65cc8e4859
commit cc87f76a60
1 changed files with 6 additions and 2 deletions
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8
kernel/sched.c
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@ -2378,8 +2378,12 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
*
* First fix up the nr_uninterruptible count:
*/
if (task_contributes_to_load(p))
rq->nr_uninterruptible--;
if (task_contributes_to_load(p)) {
if (likely(cpu_online(orig_cpu)))
rq->nr_uninterruptible--;
else
this_rq()->nr_uninterruptible--;
}
p->state = TASK_WAKING;
if (p->sched_class->task_waking)