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– Sathyajith Bhat ♦
Commented Jan 13, 2017 at 16:59
Virtual memory has frequently been used to increase physical memory. E.g. x86 PAE mode, Physical Address Extension, where the virtual address was 32 bits but the physical address larger. OS used PAE to allow more processes to reside in physical memory, avoiding page swapping overheads.
– Krazy Glew
Commented Nov 7, 2023 at 17:04
Less common, but important for some systems: PAE, as well as the style of virtual memory I call "address folding", e.g. Itanium and some IBM Power Processes can access more bits of virtual address by asking for the virtual to physical address mapping to be changed - mapping change only, not requiring I/O to disk or other swapping storage. They may do this repeatedly, so long as they don't need simultaneous mapping, and/or are willing to deal with data structures that can be remapped to different virtual addresses, e,g data structures that use offsets rather than absolute pointers.
– Krazy Glew
Commented Nov 7, 2023 at 17:13

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