[$] Memory-management patch review

Memory-management (MM) patches are notoriously difficult to get merged into themainline kernel. They are subjected to a high degree of review becausethis is an area where it is easy to get things wrong. Or, at least, thatis how it used to be. The final memory-management session at the 2017Linux Storage, Filesystem, and Memory-Management Summit was concerned withpatch review in the MM subsystem - or the lack of it.