[RFC PATCHv2 1/2] Export SoC info through sysfs

[Arnd Bergmann]

On Friday 08 April 2011, Greg KH wrote:
> Symlinks are a requirement as multiple cpus can be attached to a single
> SoC.
> 
> What about multiple cpus that are attached to multiple SoCs?  Why even
> try to describe this relationship, what would userspace get out of this
> information?

The only one I can think of is node affinity. I've worked with a system
(IBM QS2x Cell blade) that had two SoCs with multiple CPUs each. There was
a significant performance penalty when talking to devices on the remote
SoC. In that case, we used the NUMA node information in /sys/ to deal
with it, but we might not want to use the NUMA infrastructure on systems
that only have RAM on one node.

	Arnd