On Twitter, Florian Heigl sent a out a few messages about issues with xenpaging:
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19-Dec: Anyone successfully use  ? docs are at SLES manual, rest is mostly this:
 dead
 feature or usable?
22-Dec:   Hey guys, I wrote down as much as I could 
https://piratenpad.de/p/Ik3lOBLniq1L5TEM   (since I'm on holiday and not constant online)
22-Dec: Yay, tested  
Xenpaging (memory overcommit)
[x] largely untested 
[x] docs outdated 
[x] syntax+logic changed 
[x] broken
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[I've taken the liberty of removing the colorful expletive from the final post]
Is Florian's assessment correct, or is there somewhere we can point him for help?  I'm on vacation this week, but if someone replies to me, I will try to forward the information appropriately.
Thanks,
Russ Pavlicek
Xen Project Evangelist, Citrix Systems
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