[PATCH 0/2] block/SCSI MQ: two RESTART related patches

[Ming Lei]

Hi Jens,

The 1st patch runs idle hctx after dealy in scsi_mq_get_budget(),
so that we can keep same behaviour with before, and it can be
thought as a fix.

The 2nd patch cleans up RESTART, and removes handling for TAG_SHARED
from current blk-mq's RESTART mechanism because SCSI_MQ can covers its
restart by itself, so that no need to handle TAG_SHARED in blk-mq
RESTART. And >20% IOPS boost is observed in my rand read test over
scsi_debug.

John, please test this two patches and see if it may improve your SAS
IO performance, and you can find the two patches in the following branch:

	https://github.com/ming1/linux/commits/blk_mq_improve_restart_V1


Ming Lei (2):
  SCSI: run idle hctx after delay in scsi_mq_get_budget()
  blk-mq: don't handle TAG_SHARED in restart

 block/blk-mq-sched.c    | 78 +++----------------------------------------------
 drivers/scsi/scsi_lib.c | 13 +++++++--
 2 files changed, 14 insertions(+), 77 deletions(-)

-- 
2.9.5