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[Xen-devel] [PATCH 0 of 6] [RFC] Use wait queues for paging, v2

This is v2 of the patch I posted last week, after feedback from Andres. 

The first four patches are cleanups that should probably happen even
if the main waitq patch doesn't go in.

Patch 5 is the waitq patch, updated but largely following the same 
approach. I'm not suggesting it be applied right now because I know
at least one path (get_two_gfns()) needs work before it's safe.

Patch 6 is a follow-up to avoid claiming a slot unnecessarily in 
p2m_mem_paging_populate(); it's also a good idea even if the main 
waitq patch doesn't happen but would need to be backported since 
it only applies on top of those changes.


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