Messages in this thread | | | Subject | Re: [PATCH RFC] reduce runqueue lock contention | From | Peter Zijlstra <> | Date | Thu, 20 May 2010 23:23:12 +0200 |
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On Thu, 2010-05-20 at 23:09 +0200, Peter Zijlstra wrote:
> int try_to_wake_up(struct task *p, unsigned int mask, wake_flags) > { > int state = atomic_read(&p->state); > > do { > if (!(state & mask)) > return 0; > > state = atomic_cmpxchg(&p->state, state, TASK_WAKING); > } while (state != TASK_WAKING);
cpu = select_task_rq()
and then somehow see we get set_task_cpu() done without races :-)
> /* do this pending queue + ipi thing */ > > return 1; > }
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