[...]
I had that kernel up for soemthing like five weeks, on a busy, low-ram
laptop, w/o and long pauses or other noticeable pain. For at least two
years before that the best this laptop could manage before latency
became horrific was a fortnight, and weekly reboots were desirable.
Unfortunately, before I could send out a congratulatory note (I wanted
to first confirm that the result remained) I pulled up and started see-
ing even worse latency then ever.
[...]
A git pull on a clone of Linus' tree is a great way to trigger the
problem. As is using Gentoo's portage to install/upgrade anything.
(Bad python; no alligator!¹)