[$] Removing the kthread freezer?

Using the kernel thread (kthread) freezer has been a longtime problemfor a variety of reasons. It is meant as a way to suspend kthreads on theway toward system suspend, but in practice has proved problematic to thepoint that it came up at both the 2015 and2016 Kernel Summits (as well as on themailing lists over the years); the intent is to tryto remove the kthread freezer entirely. To that end, Luis Rodriguez led adiscussion in the filesystem track of the 2018 Linux Storage, Filesystem,and Memory-Management Summit on the problems and possible solutions.