FTA: A 300-GB backing store, memory mapped on a machine with no more than 16 GB of RAM, is quite typical. The user paid for 64 bits of address space, and I am n

FTA: A 300-GB backing store, memory mapped on a machine with no more than 16 GB of RAM, is quite typical. The user paid for 64 bits of address space, and I am not afraid to use it. He's writing a data structure that's not intended to fit within physical memory. mlock() doesn't do you any good in that scenario.