Memory hotplug
You can dynamically increase or decrease the memory for your running Linux® instance.
To make memory available as hotplug memory, you must define it to your LPAR or z/VM®. Hotplug memory is supported by z/VM 5.4 with the PTF for APAR VM64524 and by later z/VM versions.
As of kernel 7.0, standby memory blocks can be explicitly configured at runtime, with the choice of enabling or disabling memmap-on-memory.