[$] Famfs: a filesystem interface to shareable memory

At the 2024 LinuxStorage, Filesystem, Memory Management, and BPF Summit, John Groves leda session on famfs, which is a filesystem he has developed that uses thekernel's direct-access (DAX)mechanism to access memory that is shareable between hosts. The discussionwas aimed at whether a different approach should be taken and, inparticular, whether FUSE should be used instead of implementing as anin-kernel filesystem. As noted in the thread about hisproposal for an LSFMM+BPF session, and the mailing-list discussions on the first and secondversion of his patch set, there is some skepticism that a new in-kernelfilesystem is warranted for the use case.