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scsi: add use_cmd_list flag

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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>
This commit is contained in:
Kashyap.Desai@avagotech.com
2014-08-20 19:24:33 +05:30
committed by Christoph Hellwig
parent 2eefd57b97
commit 64bdcbc449
4 changed files with 15 additions and 12 deletions
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drivers/scsi/aacraid/linit.c
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@@ -1152,6 +1152,7 @@ static int aac_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
shost->irq = pdev->irq;
shost->unique_id = unique_id;
shost->max_cmd_len = 16;
shost->use_cmd_list = 1;
aac = (struct aac_dev *)shost->hostdata;
aac->base_start = pci_resource_start(pdev, 0);