From: Niklas Cassel <niklas.cassel@xxxxxxx> Recently, there were some extra "dummy" data added into mq-deadline rq->elv.priv, that was added for the solve purpose of working around quirky behavior in blk-mq (which called the scheduler callbacks even for requests that bypassed the scheduler). Fix blk-mq to not call the I/O scheduler callbacks for passthrough requests, since they will later bypass the I/O scheduler anyway. This way, we can remove unnecessary logic in mq-deadline that was added to deal with this quirky behavior. BFQ should be able to perform a similar cleanup, if they wish, and should then be able to drop this comment from the code: https://github.com/torvalds/linux/blob/v5.14/block/bfq-iosched.c#L6456-L6462 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 Niklas Cassel (2): blk-mq: don't call callbacks for requests that bypassed the scheduler Revert "mq-deadline: Fix request accounting" block/blk-mq.c | 7 ++++++- block/mq-deadline.c | 16 +++++----------- 2 files changed, 11 insertions(+), 12 deletions(-) -- 2.31.1
