RFC: Allow block drivers to poll for I/O instead of sleeping

[Matthew Wilcox]

On Mon, Jun 24, 2013 at 08:11:02PM -0400, Steven Rostedt wrote:
> What about hooking into the idle_balance code? That happens if we are
> about to go to idle but before the full schedule switch to the idle
> task.
> 
> 
> In __schedule(void):
> 
> 	if (unlikely(!rq->nr_running))
> 		idle_balance(cpu, rq);

That may be a great place to try it from the PoV of the scheduler, but are
you OK with me threading a struct backing_dev_info * all the way through
the scheduler to idle_balance()?  :-)