I've started seeing something called "kworker" listed recently when I run top. There is no man page for it, and there seems to be no documentation at all. Searching Google didn't help.
Even odder, it regularly makes the top ten resources consumer in top, but it doesn't seem to be using any resources:
What's it for, what does it do, and is there any documentation?26 root 20 0 0 0 0 R 0 0.0 7:08.58 kworker/1:1