RE: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead

[Luck, Tony]

> > Ahh so the need to be able to expand per cpu memory storage on demand 
> > is not as critical as we thought.
> > 
>
> Yes, but still desirable for future optimizations.
>
> For example, I do think using a per cpu memory storage on net_device refcnt & 
> last_rx could give us some speedups.

We do want to keep a very tight handle on bloat in per-cpu
allocations.  By definition the total allocation is multiplied
by the number of cpus.  Only ia64 has outrageous numbers of
cpus in a single system image today ... but the trend in
multi-core chips looks to have a Moore's law arc to it, so
everyone is going to be looking at lots of cpus before long.

-Tony
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