Hi, This patches removes the expensive atomic opeation on host-wide counter of .host_busy for scsi-mq, and it is observed that IOPS can be increased by 15% with this change in IO test over scsi_debug.
Ming Lei (3): scsi: introduce scsi_host_busy() scsi: read host_busy via scsi_host_busy() scsi: avoid to hold host-wide counter of host_busy for scsi_mq drivers/scsi/advansys.c | 8 ++++---- drivers/scsi/hosts.c | 32 +++++++++++++++++++++++++++++++ drivers/scsi/libsas/sas_scsi_host.c | 4 ++-- drivers/scsi/megaraid/megaraid_sas_base.c | 2 +- drivers/scsi/mpt3sas/mpt3sas_base.c | 4 ++-- drivers/scsi/qlogicpti.c | 2 +- drivers/scsi/scsi.c | 2 +- drivers/scsi/scsi_error.c | 6 +++--- drivers/scsi/scsi_lib.c | 23 ++++++++++++++++------ drivers/scsi/scsi_sysfs.c | 2 +- include/scsi/scsi_host.h | 1 + 11 files changed, 65 insertions(+), 21 deletions(-) Cc: Omar Sandoval <[email protected]>, Cc: "Martin K. Petersen" <[email protected]>, Cc: James Bottomley <[email protected]>, Cc: Christoph Hellwig <[email protected]>, Cc: Don Brace <[email protected]> Cc: Kashyap Desai <[email protected]> Cc: Mike Snitzer <[email protected]> Cc: Hannes Reinecke <[email protected]> Cc: Laurence Oberman <[email protected]> -- 2.9.5
