Hi Jens, Measurements have shown that limiting the queue depth to one per sequential zone has a significant negative performance impact on zoned UFS devices. Hence this patch series that increases the queue depth for write commands for sequential zones when using the mq-deadline scheduler. SCSI and UFS patches will be submitted at a later time (after multiqueue support is available for the UFS driver). Please consider this patch series for kernel v5.20. Thanks, Bart. Changes compared to v1: - Left out the SCSI and NVMe patches. - Added a null_blk patch. - Included measurement results. Bart Van Assche (6): block: Document blk_queue_zone_is_seq() and blk_rq_zone_is_seq() block: Introduce the blk_rq_is_zoned_seq_write() function block: Introduce a request queue flag for pipelining zoned writes block/mq-deadline: Only use zone locking if necessary block/null_blk: Refactor null_queue_rq() block/null_blk: Add support for pipelining zoned writes block/blk-zoned.c | 17 +++-------------- block/mq-deadline.c | 15 +++++++++------ drivers/block/null_blk/main.c | 30 ++++++++++++++++++++---------- drivers/block/null_blk/null_blk.h | 3 +++ drivers/block/null_blk/zoned.c | 4 +++- include/linux/blk-mq.h | 30 ++++++++++++++++++++++++++++++ include/linux/blkdev.h | 16 ++++++++++++++++ 7 files changed, 84 insertions(+), 31 deletions(-)
