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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>
This commit is contained in:
Nicholas Bellinger 2011-11-30 18:21:24 -08:00
parent 4d2300ccff
commit beb55a0cc1
1 changed files with 0 additions and 2 deletions
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2
drivers/target/target_core_transport.c
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@ -4655,8 +4655,6 @@ static int transport_processing_thread(void *param)
goto out;
get_cmd:
__transport_execute_tasks(dev, NULL);
cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
if (!cmd)
continue;