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authorKashyap.Desai@avagotech.com <Kashyap.Desai@avagotech.com>2014-08-20 15:54:33 +0200
committerChristoph Hellwig <hch@lst.de>2014-09-16 01:01:58 +0200
commit64bdcbc449105377dd60c8da97cfc1663b39562c (patch)
treebe79dd9fe4dfd101dc68ed5ee6d0d53ce2efad09 /drivers/scsi/dpt_i2o.c
parentsd: Avoid sending medium write commands if device is write protected (diff)
downloadlinux-64bdcbc449105377dd60c8da97cfc1663b39562c.tar.xz
linux-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 'drivers/scsi/dpt_i2o.c')
-rw-r--r--drivers/scsi/dpt_i2o.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index 67283ef418ac..072f0ec2851e 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -2363,6 +2363,7 @@ static s32 adpt_scsi_host_alloc(adpt_hba* pHba, struct scsi_host_template *sht)
host->unique_id = (u32)sys_tbl_pa + pHba->unit;
host->sg_tablesize = pHba->sg_tablesize;
host->can_queue = pHba->post_fifo_size;
+ host->use_cmd_list = 1;
return 0;
}