[tesla-dev] re-initialize APIC timer

[Bill Holler]

Li, Aubrey wrote:
> Bill.Holler wrote:
>
>   
>> Here are two other cases to consider:
>> 1. offline processors.
>> 2. Solaris disables the local APIC's timer when there are no cyclics 
>> on this processor. 
>>
>> Since neither of these cases use the local APIC's timer,  they do not
>> require lAPIC timer re-programming in idle wakeup?
>>     
>
> For offline processors, I think it should be okay.
> But how about a cyclic xcall is added when this processor is deep
> sleeping?
>   

I am not sure I understand.  Do you mean "what if a cyclic
was added to this cpu while it was idle"?
Adding  a cyclic is always done be a thread running on the cpu
who's cyclic heap is being manipulated.  See cyclic_add_here().
A cpu cannot be idle when its cyclic heap changes.  :-)


>> Solaris should use the deepest c-state available for offline
>> processors.  :-) 
>>
>>     
> The question is how to make another core to enter deepest c-state?
> cpu_offline call shoudn't be bound to  the CPU which is going to be put
> into deep c-state.
>   

IIRC an offline cpu just runs its idle loop.

Bill

> Thanks,
> -Aubrey
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