2.6.16
/!\ STILL NOT RELEASED! /!\

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Overview (useful for headlines):

OCFS2 (http://lwn.net/Articles/137278/, http://oss.oracle.com/projects/ocfs2/), a clustering filesystem contributed by Oracle (there's GFS from Red Hat who bought it from Sistina Software, shipped out-of-the-tree for now)

new unshare() ( http://lwn.net/Articles/135321/), pselect()/ppoll() and *at() system calls (http://lwn.net/Articles/164887/)

support the moving of the physical location of pages between nodes in NUMA systems

support for the Cell processor

cpufreq support for G5s plus thermal control for dualcore G5s

improved power management support for many devices and subsystems (libata, alsa...)

mutex locking primitive

high-resolution timers (http://lwn.net/Articles/167897)

per-mountpoint noatime/nodiratime

64-to-32-bit ioctl compatibilty for the v4l2 subsystem

IPv6 support for DCCP

New TIPC protocol (Transparent Inter Process Communication, http://tipc.sourceforge.net/) used for intra-clustering communication

ACL support for CIFS filesystem

HFSX filesystem support

new configfs filesystem (which complements sysfs, not replaces it)

support for running executables from v9fs (plan9 9P distributed filesystem)

support for many new devices, improved support and features for others and lots of other changes.