Re: i386 PDA patches use of %gs

[Jeremy Fitzhardinge]

Ingo Molnar wrote:
> but it does not actually use the 'normal usermode TLS selector' - it 
> only loads it.
>
> a meaningful test would be to allocate two selector values and load and 
> read+write memory through both of them.
>   

Well, obviously in one case it would need to switch between
null/non-null/null.  But yes, good point about using the "usermode" %gs
each iteration.  I'll do some more tests.

    J
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