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

[Jeremy Fitzhardinge]

H. Peter Anvin wrote:
> Eric W. Biederman wrote:
> > Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:
> >
> > > > Which means that my idea of using the technique we use on x86_32 
> > > > will not
> > > work.
> > >
> > > No, the compiler memory model we use guarantees that everything will 
> > > be within
> > > 2G of each other.  The linker will spew loudly if that's not the case.
> >
> > The per cpu area is at least theoretically dynamically allocated.  
> > And we
> > really want to put it in cpu local memory.    Which means on any 
> > reasonable
> > NUMA machine the per cpu areas should be all over the box.
> >
> > So there is no guarantee that with an arbitrary 64bit address in %gs 
> > of anything.
>
> That doesn't matter in the slightest.

Creepy, get out of my brain.

   J
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