[Xen-users] memory hotplug

[George Shuklin <george.shuklin@xxxxxxxxx>]

Good day.

I still can not make memory hotplug works (linux 3.2 + xen 3.4 in XCP).

When balloon completely deflated (low_kb=0), it trying to plug more 
memory but getting rejected:
[1935380.223401] System RAM resource 18000000 - 27ffffff cannot be added
[1935380.223414] xen_balloon: reserve_additional_memory: add_memory() 
failed: -17

I dig into sources and found that this happens when linux checking for 
conflicts in resource reservation:
stack:
add_memory()
register_memory_resource()
request_resource()
request_resource_conflict()
... and here is a conflict.

I don't really understand linux so deep, but I see xenballoon is trying 
to do it work, but can't. I tried this in linux-3.1 and linux-3.2 (rc1), 
and everytime I getting this error.
What's wrong this this? How to make hotplug working?


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