Nobody should need more memory than a 64-bit pointer can address — or so developers tend to think. The range covered by a pointer of that size seems to be nearly infinite. During the Kernel Summit track at the 2022 Linux Plumbers Conference, Matthew Wilcox took the stage to make the point that 64 bits may turn out to be too few — and sooner than we think. It is not too early to start planning for 128-bit Linux systems, which he termed ZettaLinux, and we don't want to find ourselves wishing we'd started sooner.