From 33811026a0a4208dd5725183d37fc92d5e88b0a2 Mon Sep 17 00:00:00 2001
From: Robert Elliott <elliott@hp.com>
Date: Fri, 23 Jan 2015 16:43:41 -0600
Subject: hpsa: optimize cmd_alloc function by remembering last allocation

Empirically, this improves performance slightly (~2% max IOPS) by
allowing cmd_alloc to remember where it left off searching for
free commands between calls instead of always starting its search
at command 0.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/hpsa.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/scsi/hpsa.h')

diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index 679e4d2272e0..981479a13935 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -133,6 +133,7 @@ struct ctlr_info {
 	struct CfgTable __iomem *cfgtable;
 	int	interrupts_enabled;
 	int 	max_commands;
+	int last_allocation;
 	atomic_t commands_outstanding;
 #	define PERF_MODE_INT	0
 #	define DOORBELL_INT	1
-- 
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