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* [PATCH V5 00/12] block: support bio based io polling
@ 2021-04-01  2:19 Ming Lei
  2021-04-01  2:19 ` [PATCH V5 01/12] block: add helper of blk_queue_poll Ming Lei
                   ` (13 more replies)
  0 siblings, 14 replies; 46+ messages in thread
From: Ming Lei @ 2021-04-01  2:19 UTC (permalink / raw)
  To: Jens Axboe
  Cc: linux-block, Jeffle Xu, Mike Snitzer, dm-devel, Hannes Reinecke,
	Ming Lei

Hi Jens,

Add per-task io poll context for holding HIPRI blk-mq/underlying bios
queued from bio based driver's io submission context, and reuse one bio
padding field for storing 'cookie' returned from submit_bio() for these
bios. Also explicitly end these bios in poll context by adding two
new bio flags.

In this way, we needn't to poll all underlying hw queues any more,
which is implemented in Jeffle's patches. And we can just poll hw queues
in which there is HIPRI IO queued.

Usually io submission and io poll share same context, so the added io
poll context data is just like one stack variable, and the cost for
saving bios is cheap.

V5:
	- fix one use-after-free issue in case that polling is from another
	context: adds one new cookie of BLK_QC_T_NOT_READY for preventing
	this issue in patch 8/12
	- add reviewed-by & tested-by tag

V4:
	- cover one more test_bit(QUEUE_FLAG_POLL, ...) suggested by
	  Jeffle(01/12)
	- drop patch of 'block: add helper of blk_create_io_context'
	- add new helper of blk_create_io_poll_context() (03/12)
	- drain submission queues in exit_io_context(), suggested by
	  Jeffle(08/13)
	- considering shared io context case for blk_bio_poll_io_drain()
	(08/13)
	- fix one issue in blk_bio_poll_pack_groups() as suggested by
	Jeffle(08/13)
	- add reviewed-by tag
V3:
	- fix cookie returned for bio based driver, as suggested by Jeffle Xu
	- draining pending bios when submission context is exiting
	- patch style and comment fix, as suggested by Mike
	- allow poll context data to be NULL by always polling on submission queue
	- remove RFC, and reviewed-by

V2:
	- address queue depth scalability issue reported by Jeffle via bio
	group list. Reuse .bi_end_io for linking bios which share same
	.bi_end_io, and support 32 such groups in submit queue. With this way,
	the scalability issue caused by kfifio is solved. Before really
	ending bio, .bi_end_io is recovered from the group head.



Jeffle Xu (4):
  block/mq: extract one helper function polling hw queue
  block: add queue_to_disk() to get gendisk from request_queue
  block: add poll_capable method to support bio-based IO polling
  dm: support IO polling for bio-based dm device

Ming Lei (8):
  block: add helper of blk_queue_poll
  block: add one helper to free io_context
  block: create io poll context for submission and poll task
  block: add req flag of REQ_POLL_CTX
  block: add new field into 'struct bvec_iter'
  block: prepare for supporting bio_list via other link
  block: use per-task poll context to implement bio based io polling
  blk-mq: limit hw queues to be polled in each blk_poll()

 block/bio.c                   |   5 +
 block/blk-core.c              | 258 ++++++++++++++++++++++++++--
 block/blk-ioc.c               |  15 +-
 block/blk-mq.c                | 308 +++++++++++++++++++++++++++++++++-
 block/blk-sysfs.c             |  16 +-
 block/blk.h                   |  58 +++++++
 drivers/md/dm-table.c         |  24 +++
 drivers/md/dm.c               |  14 ++
 drivers/nvme/host/core.c      |   2 +-
 include/linux/bio.h           | 132 ++++++++-------
 include/linux/blk_types.h     |  30 +++-
 include/linux/blkdev.h        |   4 +
 include/linux/bvec.h          |   8 +
 include/linux/device-mapper.h |   1 +
 include/linux/iocontext.h     |   2 +
 include/trace/events/kyber.h  |   6 +-
 16 files changed, 788 insertions(+), 95 deletions(-)

-- 
2.29.2


^ permalink raw reply	[flat|nested] 46+ messages in thread

end of thread, other threads:[~2021-04-20  7:25 UTC | newest]

Thread overview: 46+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-01  2:19 [PATCH V5 00/12] block: support bio based io polling Ming Lei
2021-04-01  2:19 ` [PATCH V5 01/12] block: add helper of blk_queue_poll Ming Lei
2021-04-01  2:19 ` [PATCH V5 02/12] block: add one helper to free io_context Ming Lei
2021-04-01  2:19 ` [PATCH V5 03/12] block: create io poll context for submission and poll task Ming Lei
2021-04-12 10:19   ` Christoph Hellwig
2021-04-01  2:19 ` [PATCH V5 04/12] block: add req flag of REQ_POLL_CTX Ming Lei
2021-04-01  2:19 ` [PATCH V5 05/12] block: add new field into 'struct bvec_iter' Ming Lei
2021-04-12  9:26   ` Christoph Hellwig
2021-04-13  9:36     ` Ming Lei
2021-04-01  2:19 ` [PATCH V5 06/12] block/mq: extract one helper function polling hw queue Ming Lei
2021-04-12  9:29   ` Christoph Hellwig
2021-04-01  2:19 ` [PATCH V5 07/12] block: prepare for supporting bio_list via other link Ming Lei
2021-04-12 10:18   ` Christoph Hellwig
2021-04-12 11:37     ` Ming Lei
2021-04-01  2:19 ` [PATCH V5 08/12] block: use per-task poll context to implement bio based io polling Ming Lei
2021-04-12  9:54   ` Christoph Hellwig
2021-04-12 10:20     ` Ming Lei
2021-04-12 10:29       ` Christoph Hellwig
2021-04-12 11:42         ` Ming Lei
2021-04-12 10:16   ` Christoph Hellwig
2021-04-12 10:37     ` Ming Lei
2021-04-01  2:19 ` [PATCH V5 09/12] blk-mq: limit hw queues to be polled in each blk_poll() Ming Lei
2021-04-01  2:19 ` [PATCH V5 10/12] block: add queue_to_disk() to get gendisk from request_queue Ming Lei
2021-04-12 12:52   ` Jens Axboe
2021-04-01  2:19 ` [PATCH V5 11/12] block: add poll_capable method to support bio-based IO polling Ming Lei
2021-04-12  9:38   ` Christoph Hellwig
2021-04-14  8:38     ` JeffleXu
2021-04-14 11:24       ` Ming Lei
2021-04-15  1:34         ` JeffleXu
2021-04-15  7:43           ` Ming Lei
2021-04-15  9:21             ` JeffleXu
2021-04-15 10:06               ` Ming Lei
2021-04-15 11:21                 ` JeffleXu
2021-04-15 13:08                   ` Ming Lei
2021-04-16  8:00   ` [PATCH] block: introduce QUEUE_FLAG_POLL_CAP flag Jeffle Xu
2021-04-16  8:42     ` JeffleXu
2021-04-16  9:07     ` Ming Lei
2021-04-16 10:20       ` JeffleXu
2021-04-17 14:06       ` JeffleXu
2021-04-19  2:21         ` Ming Lei
2021-04-19  5:40           ` JeffleXu
2021-04-19 13:36             ` Ming Lei
2021-04-20  7:25               ` JeffleXu
2021-04-01  2:19 ` [PATCH V5 12/12] dm: support IO polling for bio-based dm device Ming Lei
2021-04-09 15:39 ` [PATCH V5 00/12] block: support bio based io polling Ming Lei
2021-04-12  9:46 ` Christoph Hellwig

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