A DragonFly BSD developer, who goes by the nickname "ddegroot", has created a special driver which allows the user to increase or decrease the amount of memory available to a guest operating system in a virtual machine. The driver uses what is called a "memory balloon" which expands or shrinks to change the amount of RAM available to the guest operating system. Richard WM Jones explains: "First of all, what is a balloon driver if you’ve never even heard of the concept? It’s a way to give or take RAM from a guest. (In theory at least), if your guest needs more RAM, you can use the balloon driver to give it more RAM. Or if the host needs to take RAM away from guests, it can do so. All of this is done without needing to pause or reboot the guest..."
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