[PATCH 0/2] Change zone cache format to use less memory

[Shaun Tancheff]

Currently the RB-Tree zone cache is fast and flexible. It does
use a rather largish amount of ram. This model reduces the ram
required from 120 bytes per zone to 16 bytes per zone with a
moderate transformation of the blk_zone_lookup() api.

This model is predicated on the belief that most variations
on zoned media will follow a pattern of using collections of same
sized zones on a single device. Similar to the pattern of erase
blocks on flash devices being progressivly larger 16K, 64K, ...

The goal is to be able to build a descriptor which is both memory
efficient, performant, and flexible.

Shaun Tancheff (2):
  Move ZBC core setup to sd_zbc
  Migrate zone cache from RB-Tree to arrays of descriptors

 block/blk-core.c       |    2 +-
 block/blk-sysfs.c      |   31 +-
 block/blk-zoned.c      |  103 +++--
 drivers/scsi/sd.c      |   66 +--
 drivers/scsi/sd.h      |   20 +-
 drivers/scsi/sd_zbc.c  | 1037 +++++++++++++++++++++++++++++-------------------
 include/linux/blkdev.h |   82 +++-
 7 files changed, 759 insertions(+), 582 deletions(-)

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2.9.3