[$] Presenting heterogeneous memory to user space

Computer memory architecture is growing more complex over time, withdifferent types of memory attached to a CPU via a number of paths. Thekernel development community is duly working to make this memory availableto user space in an equally diverse set of ways. Two sessions at the 2019Linux Storage, Filesystem, and Memory-Management Summit presented possiblemechanisms and APIs to allow programs to work with the types of memory theyneed.