Re: [PATCH 0/3] scsi: scsi-mq: don't hold host_busy in IO path

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On Fri, 2018-04-20 at 14:57 +0800, Ming Lei wrote:
> 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(-)\

Hello Ming,

>From the MAINTAINERS file:

SCSI SUBSYSTEM
M:      "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxxxx>
T:      git git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git
M:      "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
T:      git git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git
L:      linux-scsi@xxxxxxxxxxxxxxx
S:      Maintained
F:      Documentation/devicetree/bindings/scsi/
F:      drivers/scsi/
F:      include/scsi/

Hence my surprise when I saw that you sent this patch series to Jens instead
of James and Martin?

Bart.




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