Re: [PATCH v4] blk-ioprio: Introduce promote-to-rt policy

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