Key new features include:
Multi-queue block support pluggable IO scheduler framework and deadline scheduler;
Solid state drives support scalable swapping;
New perf ftrace command; MD / RAID5 log ;
New statx () system call; support Opal Storage Specification driver;
Supports SMC-R protocol (RFC7609); SipHash hash function;
New LZ4 compression implementation ;
As well as a lot of security, architecture and driver updates and so on.