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

[H. Peter Anvin]

Mike Travis wrote:
> The biggest growth came from moving all the xxx[NR_CPUS] arrays into
> the per cpu area.  So you free up a huge amount of unused memory when
> the NR_CPUS count starts getting into the ozone layer.  4k now, 16k
> real soon now, ??? future?

Even (or perhaps especially) so, allocating the percpu area in 2 MB 
increments is a total nonstarter.  It hurts the small, common 
configurations way too much.  For SGI, it's probably fine.

	-hpa
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