[$] The kernel radar: folios, multi-generational LRU, and Rust

The kernel community is a busy place, so it is not even remotely possibleto write full-length articles about everything that is going on. Othertopics may be of interest, but not require a longer treatment. Theanswer is a collection of short topics covering developments that are onthe radar; the selection this time around includes folios, themulti-generational LRU, and Rust in the kernel.