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Getting Started with Oracle VM VirtualBox by Pradyumna Dash

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Memory management techniques

In an environment where multiple VMs exist, Guest Additions can be used to share physical host memory between several guest VMs by reducing their usage of the total amount of memory. Memory overcommitment is a hypervisor feature that allows a VM to use more memory space than what is available in the physical host.

Memory ballooning

To change or reduce the amount of memory allocated to the guest VM, we need to shut down the VM and modify the settings to reduce the memory. With the help of the memory ballooning feature, memory that is allocated for a VM can be given to another machine without shutting down the guest VM.

When memory ballooning is triggered, the VirtualBox Guest Additions allocates physical memory from the ...

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