[Xen-users] Memory allocation with Xen

[Shiazy Fuzzy <shiazy@xxxxxxxxx>]

Hello,

I'm using Xen 4.4.3 under Fedora 21 (kernel 4.1.13 x86_64).

All my virtual machines run CentOS 7 (kernel 3.10 x86_64) as HVM and start with overcommitted memory:

  builder="hvm"

  maxmem=8192

  memory=6144

I would like to know what techniques Xen uses to change the memory allocation of a virtual machine, when I run commands like these:

Memory decrease:

$ xl mem-set foo 4096m

Memory increase:

$ xl mem-set foo 7168m

On the Web, I found different posts talking about techniques like memory ballooning and memory hotplug.

But I don't understand what techniques my version of Xen actually uses, since some posts are very outdated and other seems related to unstable versions of Xen.

How can I find it out?

Thank you very much for your help.

Best,

S.

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