The systems administrator can use ballooning to give more memory to a VM before launching a new application. This avoids the need to shut down the VM to give it

The systems administrator can use ballooning to give more memory to a VM before launching a new application. This avoids the need to shut down the VM to give it a new role. There is still a benefit to ballooning support even if it's not exposed to userspace within the VM, because VMs aren't always used purely to host a single infinitely-long-lived application without outside intervention.