Re: [RFC 0/3] Basic support for LWP

[H. Peter Anvin]

On 10/07/2010 07:25 AM, Stephane Eranian wrote:
>>
>> No, but you wouldn't be able to use lazy FPU.
>>
> You mean lazy restore, I am guessing here.
> Is that to say, you cannot figure out whether the FPU state in
> the CPU on ctxsw in is yours anymore?
> 

Lazy save/restore, and more or less, yes.  Really, XSAVE was designed to
be saved/restored as a unit, with unused state skipped.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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