Linus has released the 3.15 kernel after one week of overlapping development with the 3.16 merge window. Headline features in 3.15 include some significant memory management improvements, the renameat2() system call, file-private POSIX locks, a new device mapper target called dm-era, faster resume from suspend, and more.
Linus also noted that, while overlapping the 3.16 merge window with the final 3.15 stabilization worked well enough, he is not necessarily inclined to do it every time. “I also don’t think it was such a wonderful experience that I’d want to necessarily do the overlap every time, without a good specific reason for doing so. It was kind of nice being productive during the last week or rc (which is usually quite boring and dead), but I think it might be a distraction when people should be worrying about the stability of the rc.”