Re: [PATCH 3/4] scheduler: replace migration_thread with cpu_stop

[Peter Zijlstra]

On Thu, 2010-04-22 at 18:09 +0200, Tejun Heo wrote:
> @@ -2909,7 +2912,9 @@ redo:
>                         }
>                         raw_spin_unlock_irqrestore(&busiest->lock, flags);
>                         if (active_balance)
> -                               wake_up_process(busiest->migration_thread);
> +                               stop_one_cpu_nowait(cpu_of(busiest),
> +                                       active_load_balance_cpu_stop, busiest,
> +                                       &busiest->active_balance_work); 

So who guarantees busiest->active_balance_work isn't already enqueued by
some other cpu's load-balancer run?


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