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timers: split process wide cpu clocks/timers, fix

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To decrease the chance of a missed enable, always enable the timer when we
sample it, we'll always disable it when we find that there are no active timers
in the jiffy tick.

This fixes a flood of warnings reported by Mike Galbraith.

Reported-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-02-10 16:37:31 +01:00 • committed by Ingo Molnar
parent ff08f76d73
commit 3fccfd67df
2 changed files with 15 additions and 28 deletions
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1
include/linux/sched.h
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@ -2209,6 +2209,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
unsigned long flags;
spin_lock_irqsave(&cputimer->lock, flags);
cputimer->running = 1;
*times = cputimer->cputime;
spin_unlock_irqrestore(&cputimer->lock, flags);
}