[RFC PATCH 00/09] robust VM per_cpu variables

[Christoph Lameter]

On Wed, 17 May 2006, Steven Rostedt wrote:

> > Well I'd like to see a comprehensive solution including a fix for the
> > problems with allocper_cpu() allocations (allocper_cpu has to allocate
> > memory for potential processors... which could be a lot on
> > some types of systems and its allocated somewhere not on the nodes of the
> > processor since they may not yet be online).
> 
> OK, now you're beyond what I'm working with ;)  No hot plug CPUs for me.
> Well, at least not yet!

You need to at least consider how this could be handled by the per_cpu 
memory manangement. The VM thingie with dynamic per cpu memory would allow 
a fixup of allocpercpu.