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

[Steven Rostedt]

On Mon, 2013-06-24 at 23:07 -0400, Matthew Wilcox wrote:
> 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()?  :-)

Well, there's other ways to pass data down besides parameters. You could
attach something to the task itself.

-- Steve