From: Kashyap.Desai@avagotech.com <Kashyap.Desai@avagotech.com>
Date: Wed, 20 Aug 2014 13:54:33 +0000 (+0530)
Subject: scsi: add use_cmd_list flag
X-Git-Tag: fixes-for-v3.18-merge-window~25^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64bdcbc449105377dd60c8da97cfc1663b39562c;p=pandora-kernel.git

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>
---

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