[PATCH v2 0/2] Enable polling on stackable devices

Andrzej Jakowski
2020-02-11T19:17:54Z

Changes since v1:
- reintroduced original blk_poll() function that has been removed some time
ago (Jens)

- added fastpath calls to blk_mq_poll() in blk_poll() (Christoph, Jens)

- incorporated code style fixes into md patch (Christoph)

[1]: https://lore.kernel.org/linux-block/20200126044138.5066-1-andrzej.jakowski@linux.intel.com/T/#t

---

IO polling is available on blk-mq devices. It is not possible to perform IO
polling on stackable devices like MD.

In this patch series we propose to reintroduce blk_poll() function. blk_poll()
when called on stackable block device that supports polling will invoke its
polling handler. Otherwise it will call blk_mq_poll() directly for fast
accesses.

This patch set also includes example implemetation of polling on MD RAID-0
volume.

---

TODO:
- introduce REQ_NOWAIT support for stackable devices in a separate patchset
(Christoph)

Andrzej Jakowski (1):
block: reintroduce polling on bio level

Artur Paszkiewicz (1):
md: enable io polling

block/blk-core.c | 28 ++++++++++++++++++++++++++++
block/blk-mq.c | 23 ++---------------------
block/blk-mq.h | 2 ++
drivers/md/md.c | 40 ++++++++++++++++++++++++++++++++++++----
include/linux/blkdev.h | 2 ++
5 files changed, 70 insertions(+), 25 deletions(-)

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2.20.1