[tesla-dev] _PSD -> Power Processor Groups

[Eric Saxe]

Mark Haywood wrote:
>> I'm wondering if you think it makes sense for the CPU power manager to 
>> export the interfaces to the Processor Grouping Framework. Please see 
>> the attached figure...
>>     
>
> Yes, I think it makes sense. I'd expect that such an interface might be 
> a common PM policy engine interface and I guess in this case the the CPU 
> power manager is part of the PM policy engine? Sarito might be able to 
> provide some thoughts on whether this is what he'd envisioned.
>   

Right, I would suppose the CPU power manager would need to know policy, 
or at least be configured to operate in accordance with the policy.

> For prototyping purposes, it should be easy create a CPU "power manager" 
> entity, have it get the processor group information from the CPU driver 
> and present the information in some fashion to the PGF.
>
>   
Great. I should have clarity soon as to what sort of interfaces the PGF 
could expect.

>> The idea is for the Processor Grouping Framework to query the CPU 
>> Power Manager for the CPU's power grouping information, and the CPU 
>> power manager in turn would get this from the platform dependent CPU 
>> PM driver, which would get it from ACPI, or the sun4v MD, etc.
>>     
>
> This makes sense to me, but I'm not comfortable with how sun4v might do 
> this. I want to make sure that someone more familiar with sun4v is good 
> with this.
>   
Right. We should be sure to get the right eyes on the design doc when 
it's up for review.

Thanks,
-Eric