Messages in this thread | | | Date | Thu, 10 Jul 2008 15:32:20 -0400 | From | "H. Peter Anvin" <> | Subject | Re: [RFC 00/15] x86_64: Optimize percpu accesses |
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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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