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

Peter Zijlstra
2013-11-20T16:59:36Z

On Wed, Nov 20, 2013 at 08:40:49AM -0800, Arjan van de Ven wrote:
> On 11/20/2013 8:04 AM, Peter Zijlstra wrote:
> >This does not fully preseve existing behaviour in that the generic
> >idle cycle function calls into the normal cpuidle governed idle
> >routines and should thus respect things like QoS parameters and the
> >like.
>
>
> NAK on the powerclamp side.
>
> powerclamp MUST NOT do that....
> it is needed to go to the deepest state no matter what
> (this is for when your system is overheating. there is not a lot of choice
> here... alternative is an emergency reset that the hardware does for safety)

Then its a worse broken piece of shit than I thought it was.

The only way to do what you want is to pretty much do stop_machine().

There's no guarantee your current FIFO-50 tasks will ever get to run.

Also, since when does Intel hardware do emergency resets on thermal
events? It used to force throttle stuff.