Hi,
please update ioprio_get(2) to the today more common Multi-Queue Block
IO Queueing Mechanism (blk-mq). In particular:
These system calls have an effect only when used in conjunction
with an I/O scheduler that supports I/O priorities. As at kernel
2.6.17 the only such scheduler is the Completely Fair Queuing
(CFQ) I/O scheduler.
As far as I know BFQ is the only mq-iosched which supports (read-)
priorities. See also [1]. The kernel Documentation/block/ioprio.txt is
outdated as well, I guess I'll send an email there too.
Thanks and kind regards
Tycho Kirchner
[1]: https://www.kernel.org/doc/html/latest/block/bfq-iosched.html
