Linux Kernel 2.6.21 has been announced. Linus writes: “So the big change during 2.6.21 is all the timer changes to support a tickless system (and even with ticks, more varied time sources). Thanks (when it no longer broke for lots of people 😉 go to Thomas Gleixner and Ingo Molnar and a cadre of testers and coders.” More info here and here.