[dm-devel] [PATCHv2 00/15] dm-zoned: multi-device support

[Hannes Reinecke]

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

Hannes Reinecke (15):
  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: allocate dm devices dynamically
  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 | 448 ++++++++++++++++++++++++-----------------
 drivers/md/dm-zoned-reclaim.c  |  95 +++++----
 drivers/md/dm-zoned-target.c   | 169 ++++++++++------
 drivers/md/dm-zoned.h          |  77 ++++---
 4 files changed, 481 insertions(+), 308 deletions(-)

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2.16.4