[dm-devel] [dm-6.4 PATCH v3 00/20] dm bufio, thin: improve concurrent IO performance

[Mike Snitzer <snitzer@kernel.org>]

Hi,

Please review and/or test. Thanks.

Available via git here:
https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-6.4-dev3

Diffstat from v2 to v3:

git diff dm/dm-6.4-dev2 dm/dm-6.4-dev3 | diffstat
 dm-bio-prison-v1.c |   80 ++++++++++--------
 dm-bio-prison-v1.h |    5 +
 dm-bufio.c         |  226 ++++++++++++++++++++++++++++-------------------------
 dm-thin.c          |   29 ++++--
 dm.h               |   10 ++
 5 files changed, 197 insertions(+), 153 deletions(-)

Changes from v2 to v3:
- fixed inconsistent braces in conditionals and other whitespace nits
  in response to the quick review Jens offered on v2
- also fixed struct layout Jens noted, so locks and data they protect
  are on the same cacheline
- split v2's really large dm-bufio-improve-concurrent-IO-performance
  patch to be 4 patches (patches 5-8)
- removed the (ab)use of BUG_ON in most of dm-bufio.c (in preliminary
  patches 2-4 and also within patches 5-7)
- removed the bio-prison-v1.c's BUG_ON (introduced in patch 14) in
  favor of higher level dm-thin.c code checking when it builds the
  prison key (allowing for graceful error handling), in patch 15.
- introduced dm_num_sharded_locks and use it to remove the "NR_LOCKS"
  magic value (64) used to split locks in both dm-bio-prison-v1 and
  dm-bufio (patches 16-20).

Changes from v1 to v2:
- fixed dm-thin to properly split discards to respect
  dm-bio-prison-v1's BIO_PRISON_MAX_RANGE limit

Joe Thornber (7):
  dm bufio: remove unused dm_bufio_release_move interface
  dm bufio: add LRU abstraction
  dm bufio: add dm_buffer_cache abstraction
  dm bufio: improve concurrent IO performance
  dm bufio: add lock_history optimization for cache iterators
  dm thin: speed up cell_defer_no_holder()
  dm bio prison v1: improve concurrent IO performance

Mike Snitzer (11):
  dm bufio: use WARN_ON in dm_bufio_client_destroy and dm_bufio_exit
  dm bufio: never crash if dm_bufio_in_request()
  dm bufio: don't bug for clear developer oversight
  dm bufio: move dm_bufio_client members to avoid spanning cachelines
  dm: split discards further if target sets max_discard_granularity
  dm bio prison v1: add dm_cell_key_has_valid_range
  dm: add dm_num_sharded_locks()
  dm bufio: prepare to intelligently size dm_buffer_cache's buffer_trees
  dm bufio: intelligently size dm_buffer_cache's buffer_trees
  dm bio prison v1: prepare to intelligently size dm_bio_prison's
    prison_regions
  dm bio prison v1: intelligently size dm_bio_prison's prison_regions

Mikulas Patocka (2):
  dm bufio: use waitqueue_active in __free_buffer_wake
  dm bufio: use multi-page bio vector

 drivers/md/dm-bio-prison-v1.c |   93 +-
 drivers/md/dm-bio-prison-v1.h |   15 +
 drivers/md/dm-bufio.c         | 1988 +++++++++++++++++++++++----------
 drivers/md/dm-thin.c          |  125 ++-
 drivers/md/dm.c               |   25 +-
 drivers/md/dm.h               |   10 +
 include/linux/device-mapper.h |    6 +
 include/linux/dm-bufio.h      |    6 -
 include/uapi/linux/dm-ioctl.h |    4 +-
 9 files changed, 1558 insertions(+), 714 deletions(-)

-- 
2.40.0

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