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