From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Thu, 1 Dec 2011 02:21:24 +0000 (-0800)
Subject: target: Remove __transport_execute_tasks() for each processing context
X-Git-Tag: v3.3-rc1~7^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=beb55a0cc15a43be43a646b588fcf83822f0c44f;p=pandora-kernel.git

target: Remove __transport_execute_tasks() for each processing context

This patch removes the original usage of __transport_execute_tasks() ahead
of every transport_get_cmd_from_queue() call in transport_processing_thread().
This helps reduce se_device->execute_task_lock contention between qla2xxx wq
with target_submit_cmd() for READs and transport_processing_thread()
context servicing WRITEs with full payloads for I/O submission.

It also adds a __transport_execute_tasks() to kick the task queue again
without a *se_cmd descriptor with existing queue full logic, but this may
end up not being necessary.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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