Re: [RFC 00/15] x86_64: Optimize percpu accesses

[H. Peter Anvin]

Jeremy Fitzhardinge wrote:
> >  Its best to consistently access
> > per cpu variables using the segment registers.
>
> It is, but initially the segment base is 0, so just using a percpu 
> variable does something sensible from the start with no special setup.

That's easy enough to fix -- synthesizing a GDT entry is trivial enough 
-- but since it currently works, and since the offsets on 32 bits can 
reach the full address space anyway, there is no reason to change.

	-hpa
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