[PATCHv3,00/14] dm-zoned: multiple drive support

Message

Hannes Reinecke May 29, 2020, 5:38 p.m. UTC

Hi all,

here's the second version of my patchset to support multiple zoned
drives with dm-zoned.
This patchset:
- Converts the zone array to using xarray for better scalability
- Separates out shared structures into per-device structure
- Enforce drive-locality for allocating and reclaiming zones
- Lifts the restriction of 2 devices to handle an arbitrary number
  of drives.

This gives me a near-perfect scalability by increasing the write
speed from 150MB/s (for a cache and one zoned drive) to 300MB/s
(for a cache and two zoned drives).

Changes to v1:
- Include reviews from Damien
- Reshuffle patches
Changes to v2:
- Add reviews from Damien
- Merge patches 'dynamic device allocation' and
  'support arbitrary number of devices'
- Fix memory leak when reading tertiary superblocks

Hannes Reinecke (14):
  dm-zoned: add debugging message for reading superblocks
  dm-zoned: secondary superblock must reside on the same devices than
    primary superblock
  dm-zoned: improve logging messages for reclaim
  dm-zoned: add a 'reserved' zone flag
  dm-zoned: convert to xarray
  dm-zoned: temporary superblock for tertiary devices
  dm-zoned: add device pointer to struct dm_zone
  dm-zoned: add metadata pointer to struct dmz_dev
  dm-zoned: per-device reclaim
  dm-zoned: move random and sequential zones into struct dmz_dev
  dm-zoned: support arbitrary number of devices
  dm-zoned: allocate zone by device index
  dm-zoned: select reclaim zone based on device index
  dm-zoned: prefer full zones for reclaim

 drivers/md/dm-zoned-metadata.c | 453 +++++++++++++++++++++++++----------------
 drivers/md/dm-zoned-reclaim.c  |  95 +++++----
 drivers/md/dm-zoned-target.c   | 169 +++++++++------
 drivers/md/dm-zoned.h          |  77 ++++---
 4 files changed, 485 insertions(+), 309 deletions(-)