FYI, I decided to do this:

$ sudo swapoff -a && sudo swapon -a
$ free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       5.9Gi       4.8Gi       2.0Gi       4.8Gi       7.2Gi
Swap:          15Gi       348Mi        15Gi

Even though I am no where near needing to swap, after the
swapoff/swapon, it immediately climbed back up to 348M.

Oddly, I did it again after flushing the page cache, and the swap stayed
at zero:

$ sudo sync ; sudo sh -c 'echo 1 > /proc/sys/vm/drop_caches'
$ sudo swapoff -a && sudo swapon -a
$ free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       5.6Gi       6.8Gi       2.6Gi       3.1Gi       7.0Gi
Swap:          15Gi          0B        15Gi

I don't know if flushing the page cache is related or coincidence with
the second swap clearance.

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https://bugs.launchpad.net/bugs/1861359

Title:
  swap storms kills interactive use

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