On Mon, Jun 24, 2013 at 09:17:18AM +0200, Jens Axboe wrote:
> On Sun, Jun 23 2013, Linus Torvalds wrote:
> >
> > You could try to do that either *in* the idle thread (which would take
> > the context switch overhead - maybe negating some of the advantages),
> > or alternatively hook into the scheduler idle logic before actually
> > doing the switch.
>
> It can't happen in the idle thread. If you need to take the context
> switch, then you've negated pretty much all of the gain of the polled
> approach.
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);
-- Steve
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