diff options
| author |   Kashyap.Desai@avagotech.com <Kashyap.Desai@avagotech.com> | 2014-08-20 19:24:33 +0530 |
|---|---|---|
| committer |   Christoph Hellwig <hch@lst.de> | 2014-09-15 16:01:58 -0700 |
| commit | 64bdcbc449105377dd60c8da97cfc1663b39562c (patch) | |
| tree | be79dd9fe4dfd101dc68ed5ee6d0d53ce2efad09 /include/scsi | |
| parent | sd: Avoid sending medium write commands if device is write protected (diff) | |
| download | linux-dev-64bdcbc449105377dd60c8da97cfc1663b39562c.tar.xz linux-dev-64bdcbc449105377dd60c8da97cfc1663b39562c.zip | |
scsi: add use_cmd_list flag
Add a use_cmd_list flag in struct Scsi_Host to request keeping track of
all outstanding commands per device.
Default behaviour is not to keep track of cmd_list per sdev, as this may
introduce lock contention. (overhead is more on multi-node NUMA.), and
only enable it on the two drivers that need it.
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index ba2034779961..cafb260ef2d3 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -680,6 +680,7 @@ struct Scsi_Host { unsigned no_write_same:1; unsigned use_blk_mq:1; + unsigned use_cmd_list:1; /* * Optional work queue to be utilized by the transport |