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qla2xxx: Remove dependency on hardware_lock to reduce lock contention.

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Sessions management (add, deleted, modify) currently are serialized
through the hardware_lock.  Hardware_lock is a high traffic lock.
This lock is accessed by both the transmit & receive sides.

Sessions management is now moved off to another lock call sess_lock.
This is done to reduce lock contention and increase traffic throughput.

Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Quinn Tran
2015-12-17 14:57:04 -05:00
committed by Nicholas Bellinger
parent 193b50b9d5
commit 7560151b6b
4 changed files with 106 additions and 56 deletions
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drivers/scsi/qla2xxx/qla_def.h
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@@ -2929,6 +2929,7 @@ struct qlt_hw_data {
uint32_t num_qfull_cmds_dropped;
spinlock_t q_full_lock;
uint32_t leak_exchg_thresh_hold;
spinlock_t sess_lock;
};
#define MAX_QFULL_CMDS_ALLOC 8192