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SubjectRe: Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?]

> so ia64 is one of those archs with a ram layout with huge holes in the
> middle of the ram of the nodes? I'd be curious to know what's the
> hardware advantage of designing the ram layout in such a way, compared
> to all other numa archs that I deal with. Also if you know other archs
> with huge holes in the middle of the ram of the nodes I'd be curious to
> know about them too. thanks for the interesting info!

From arch/ppc64/kernel/iSeries_setup.c:

* The iSeries may have very large memories ( > 128 GB ) and a partition
* may get memory in "chunks" that may be anywhere in the 2**52 real
* address space. The chunks are 256K in size.

Also check out CONFIG_MSCHUNKS code and see why I'd love to see a generic
solution to this problem.

Anton
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