Re: [Xen-devel] Is it possiable to use domU's balloon in dom0 user program?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sat, 2013-04-13 at 11:21 +0100, Demon King wrote:
> Our team want designed a program in dom0 to control vm's memory
> through balloon, such as to increasing balloon memery of vm1 and then
> other vm will use it later. Is it possiable to do this?Thank you! 

I'm not 100% what you are asking but if you are asking if you can reduce
a domain's memory with ballooning and the subsequently (either
immediately or later) increase the memory allocation of another domain
using that slack memory then the answer is yes.

The only constraint is that in the absence of memory hotplug (which is
present in mainline kernels but not AFAIK support yet by most
toolstacks) you cannot balloon a guest up to more than its original
memmax= value, note that it is possible to boot a PV domain with less
current allocation than its maxmem ("preballooned") and using PoD and
suitable PV drivers the same can be done with some types of HVM guest.

Ian.


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