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Subjectvery low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
Hi,

I recently noticed that between 6441998e2e and 9eaa88c703, I/O became
much slower on my machine using ext4 on dm-crypt on NVMe with bfq
scheduler. Checking iostat during heavy usage (find / -xdev and fstrim
-v /), maximum IOPS had fallen from ~10000 to ~100. Reverting cb2ac2912a
("block: reduce kblockd_mod_delayed_work_on() CPU consumption") resolves
the issue.

Thanks,
Alex.

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