Jens,
This series provides fixes and improvements for null_blk.
The first two patches are bug fixes which likely should go into 5.10.
The first patch fixes a problem with zone initialization when the
device capacity is not a multiple of the zone size and the second
patch fixes zone append handling.
The following patches are improvements and cleanups:
* Patch 3 makes sure that the device max_sectors limit is aligned to the
block size.
* Patch 4 improves zone locking overall, and especially the memory
backing disabled case by introducing a spinlock array to implement a
per zone lock in place of a global lock. With this patch, write
performance remains mostly unchanged, but read performance with a
multi-queue setup more than double from 1.3 MIOPS to 3.3 MIOPS (4K
random reads to zones with fio zonemode=zbd).
* Patch 5 improves implicit zone close
* Patch 6 and 7 cleanup discard handling code and use that code to free
the memory backing a zone that is being reset.
* Patch 8 adds the max_sectors configuration option to allow changing
the max_sectors/max_hw_sectors of the device.
* Finally, patch 9 moves nullblk into its own directory under
drivers/block/null_blk/
Comments are as always welcome.
Damien Le Moal (9):
null_blk: Fix zone size initialization
null_blk: Fail zone append to conventional zones
null_blk: Align max_hw_sectors to blocksize
null_blk: improve zone locking
null_blk: Improve implicit zone close
null_blk: cleanup discard handling
null_blk: discard zones on reset
null_blk: Allow controlling max_hw_sectors limit
null_blk: Move driver into its own directory
drivers/block/Kconfig | 8 +-
drivers/block/Makefile | 7 +-
drivers/block/null_blk/Kconfig | 12 +
drivers/block/null_blk/Makefile | 11 +
.../{null_blk_main.c => null_blk/main.c} | 65 +++--
drivers/block/{ => null_blk}/null_blk.h | 9 +-
.../{null_blk_trace.c => null_blk/trace.c} | 2 +-
.../{null_blk_trace.h => null_blk/trace.h} | 2 +-
.../{null_blk_zoned.c => null_blk/zoned.c} | 245 ++++++++++++------
9 files changed, 239 insertions(+), 122 deletions(-)
create mode 100644 drivers/block/null_blk/Kconfig
create mode 100644 drivers/block/null_blk/Makefile
rename drivers/block/{null_blk_main.c => null_blk/main.c} (97%)
rename drivers/block/{ => null_blk}/null_blk.h (94%)
rename drivers/block/{null_blk_trace.c => null_blk/trace.c} (93%)
rename drivers/block/{null_blk_trace.h => null_blk/trace.h} (97%)
rename drivers/block/{null_blk_zoned.c => null_blk/zoned.c} (76%)
--
2.26.2
