Re: ioprio_get(2) outdated

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Hi Tycho,

On 5/20/21 12:30 PM, Tycho Kirchner wrote:
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 The kernel Documentation/block/ioprio.txt is outdated as well, I guess I'll send an email there too.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

Okay, I don't know much about it, so I'll CC Michael.

Thanks,

Alex




[1]: https://www.kernel.org/doc/html/latest/block/bfq-iosched.html


--
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
Senior SW Engineer; http://www.alejandro-colomar.es/



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