Re: [PATCH v3 01/18] block: introduce duration-limits priority class

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On 1/28/23 12:25, Martin K. Petersen wrote:
  - Wrt. ioprio as conduit, I personally really dislike the idea of
    conflating priority (relative performance wrt. other I/O) with CDL
    (which is a QoS concept). I would really prefer those things to be
    separate. However, I do think that the ioprio *interface* is a good
    fit. A tool like ionice seems like a reasonable approach to letting
    generic applications set their CDL.

Hi Martin,

My understanding is that ionice uses the ioprio_set() system call and hence only affects foreground I/O but not page cache writeback. This is why I introduced the ioprio rq-qos policy (block/blk-ioprio.c). How about not adding CDL support in ioprio_set() and only supporting configuration of CDL via the v2 cgroup mechanism?

Thanks,

Bart.




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