Re: [PATCH 3/7] idle, thermal, acpi: Remove home grown idle implementations

Arjan van de Ven
2013-11-21T16:21:07Z

On 11/21/2013 8:07 AM, Paul E. McKenney wrote:
> As long as RCU has some reliable way to identify an idle task, I am
> good. But I have to ask -- why can't idle injection coordinate with
> the existing idle tasks rather than temporarily making alternative
> idle tasks?

it's not a real idle. that's the whole problem of the situation.
to the rest of the OS, this is being BUSY (busy saving power using
a CPU instruction, but it might as well have been an mdelay() operation)
and it's also what end users expect; they want to be able to see
where there performance (read: cpu time in "top") is going.