[RFC PATCH 0/2] improve io scheduler callback triggering

From: Niklas Cassel
Date: Fri Aug 27 2021 - 08:41:29 EST

From: Niklas Cassel <niklas.cassel@xxxxxxx>

Recently, there were some extra "dummy" data added into mq-deadline
rq->elv.priv, that was there for the solve purpose of working around
shortcomings in blk-mq (which called the scheduler callbacks even
for requests that bypassed the scheduler).

Fix blk-mq to behave in a more sane way with regards to scheduler
callback triggering, and remove the now unneeded rq->elv.priv magic.

BFQ should be able to perform a similar cleanup, and should be able
to drop this comment from the code:

Considering that I'm quite unfamiliar with the BFQ code, I'd rather
someone who is a bit more familiar with BFQ performs that cleanup.

Kind regards,

Niklas Cassel (2):
blk-mq: don't call callbacks for requests that bypassed the scheduler
Revert "mq-deadline: Fix request accounting"

block/blk-mq-sched.c | 20 ++++++++++++++++++++
block/blk-mq.c | 13 -------------
block/mq-deadline.c | 16 +++++-----------
include/linux/blkdev.h | 3 ++-
4 files changed, 27 insertions(+), 25 deletions(-)