Re: [RFC][PATCH 1/3] sched: Provide delayed wakeup list

[Peter Zijlstra]

On Wed, 2011-09-14 at 15:30 +0200, Peter Zijlstra wrote:
> +       if (cmpxchg(&n->next, 0, n) != 0) {
> +               /* It was already queued, drop the extra ref and we're done. */
> +               put_task_struct(p);
> +               return;
> +       }
> +
> +       /*
> +        * The head is context local, there can be no concurrency.
> +        */
> +       n->next = head->first; 

That could of course be folded into one op..
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