[$] Revisiting mshare

Linux can share memory between processes, but each process (almost always)has its own set of page tables. In situations where vast numbers ofprocesses are sharing a memory region, the combined size of the pagetables can exceed that of the shared memory itself. There has, thus, longbeen an interest in enabling unrelated processes to share page tablesreferring to shared memory. Anthony Yznaga is the latest developer to tryto push this idea (known as "mshare") forward; he described the status ofthat work in a memory-management-track discussion at the 2026 Linux Storage,Filesystem, Memory Management, and BPF Summit (LSFMM+BPF).