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Subject[PATCH v2 0/3] blk-mq: Optimise blk_mq_queue_tag_busy_iter() for shared tags
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In [0] Kashyap reports high CPU usage for blk_mq_queue_tag_busy_iter()
and callees for shared tags.

Indeed blk_mq_queue_tag_busy_iter() would be less optimum for moving to
shared tags, but it was not optimum previously.

This series optimises by having only a single iter (per regular and resv
tags) for the shared tags, instead of an iter per HW queue.

[0] https://lore.kernel.org/linux-block/e4e92abbe9d52bcba6b8cc6c91c442cc@mail.gmail.com/

Differences to v1:
- Add tested-by and reviewed-by tags
- Reformat 3/3 a bit to keep <= 80 char lines
- I kept the RB tags, so please check and let me know if not ok
with the changes

John Garry (3):
blk-mq: Drop busy_iter_fn blk_mq_hw_ctx argument
blk-mq: Delete busy_iter_fn
blk-mq: Optimise blk_mq_queue_tag_busy_iter() for shared tags

block/blk-mq-tag.c | 65 ++++++++++++++++++++++++++++--------------
block/blk-mq-tag.h | 2 +-
block/blk-mq.c | 17 ++++++-----
include/linux/blk-mq.h | 2 --
4 files changed, 53 insertions(+), 33 deletions(-)

--
2.26.2

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