On Fri, 28 Apr 2023 15:44:04 +0800, Hou Tao wrote:
> Since commit a78418e6a04c ("block: Always initialize bio IO priority on
> submit"), bio->bi_ioprio will never be IOPRIO_CLASS_NONE when calling
> blkcg_set_ioprio(), so there will be no way to promote the io-priority
> of one cgroup to IOPRIO_CLASS_RT, because bi_ioprio will always be
> greater than or equals to IOPRIO_CLASS_RT.
>
> It seems possible to call blkcg_set_ioprio() first then try to
> initialize bi_ioprio later in bio_set_ioprio(), but this doesn't work
> for bio in which bi_ioprio is already initialized (e.g., direct-io), so
> introduce a new promote-to-rt policy to promote the iopriority of bio to
> IOPRIO_CLASS_RT if the ioprio is not already RT.
>
> [...]
Applied, thanks!
[1/1] blk-ioprio: Introduce promote-to-rt policy
commit: ddf63516d8d37528dc6834c7f19b55084e956068
Best regards,
--
Jens Axboe
