[PATCH 0/9] target: Optimizations + cleanups for v3.11

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

From: Nicholas Bellinger <nab@linux-iscsi.org>

Hi folks,

This series contains a number of target optimizations added during
recent prototype scsi-mq performance profiling in order to avoid
unnecessary se_cmd->t_state_lock acquire/release in fast path I/O
submission and completion code.

All of the target optimizations are independent of driver code, so
all fabrics should benefit from these improvements.

Also included are two vhost/scsi specific patches, one in the same
vein to avoid unnecessary se_cmd->t_state_lock access, and the second
to convert vhost/scsi to proper cmd_kref TARGET_SCF_ACK_KREF usage.

Please have a look.

Thanks,

--nab

Nicholas Bellinger (9):
  target: Add transport_cmd_check_stop write_pending bit
  target: Drop unnecessary CMD_T_DEV_ACTIVE check from
    transport_lun_remove_cmd
  target: Remove legacy t_fe_count + avoid t_state_lock access in
    transport_put_cmd
  target: Avoid extra t_state_lock access in __target_execute_cmd
  target: Drop unnecessary t_state_lock access for
    SCF_SUPPORTED_SAM_OPCODE assignment
  iscsi-target: Avoid unnecessary t_state_lock during unsolicited
    data-out check
  target: Drop legacy se_cmd->check_release bit
  vhost/scsi: Drop unnecessary wait_for_tasks=true usage with
    transport_generic_free_cmd
  vhost/scsi: Convert to se_cmd->cmd_kref TARGET_SCF_ACK_KREF usage

 drivers/target/iscsi/iscsi_target.c    |    6 ---
 drivers/target/target_core_tmr.c       |   12 +----
 drivers/target/target_core_transport.c |   72 ++++++++-----------------------
 drivers/vhost/scsi.c                   |   33 +++++++++------
 include/target/target_core_base.h      |    3 -
 5 files changed, 41 insertions(+), 85 deletions(-)

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1.7.2.5