Memory model -> Sparse Memory (CONFIG_SPARSEMEM)
Allow for memory hot-add (CONFIG_MEMORY_HOTPLUG)
-- To enable memory removal, the followings are also necessary
+- To enable memory removal, the following are also necessary
Allow for memory hot remove (CONFIG_MEMORY_HOTREMOVE)
Page Migration (CONFIG_MIGRATION)
-- For ACPI memory hotplug, the followings are also necessary
+- For ACPI memory hotplug, the following are also necessary
Memory hotplug (under ACPI Support menu) (CONFIG_ACPI_HOTPLUG_MEMORY)
This option can be kernel module.