I forgot to mention that bfq appears to be the only IO scheduler that supports 
cgroups-v2 IO controllers [1]. Perhaps I am wrong, but I wasn't able to find 
documentation indicating that mq-deadline is cgroup-aware, at the very least 
it's not documented in the official deadline tunables section [2].

I'm mentioning this because btrfs' support for cgroups-v2 (and the IO 
isolation/fairness capability it provides) was listed as one of the key reasons 
to move to btrfs. While I am not clear on exactly how the IO scheduler and 
files system interact when it comes to IO cgroups, I thought it was worth 
bringing up.

[2] https://www.kernel.org/doc/html/latest/block/deadline-iosched.html
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