📚 [$] Faster page faults with RCU-protected VMA walks

Looking up a virtual memory area (VMA) in a process's address space, for the handling of page faults or any of a number of other tasks, in multi-threaded processes has long been bedeviled by lock contention in the kernel. As a result, developer gatherings have been subjected to many sessions on how to improve the situation. At the 2024 Linux Storage, Filesystem, Memory-Management and BPF Summit, developers in the memory-management track met, in a session led by Liam Howlett, to talk about a situation that has improved considerably in recent times, but which still offers opportunities for optimization. ...