From: Jiri Pirko <jpirko@redhat.com>
Date: Wed, 19 May 2010 03:26:39 +0000 (+0000)
Subject: bonding: optimize tlb_get_least_loaded_slave
X-Git-Tag: v3.12-rc1~9497^2~682
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=097811bb48c7837db94d7fe5d94f0f4b5e19e78c;p=kernel%2Fkernel-generic.git

bonding: optimize tlb_get_least_loaded_slave

In the worst case, when the first loop breaks an the end of the slave list,
the slave list is iterated through twice. This patch reduces this
function only to one loop. Also makes it simpler.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 40fdc41..25c14c6 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -233,34 +233,27 @@ static void tlb_deinitialize(struct bonding *bond)
 	_unlock_tx_hashtbl(bond);
 }
 
+static long long compute_gap(struct slave *slave)
+{
+	return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
+	       (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
+}
+
 /* Caller must hold bond lock for read */
 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
 {
 	struct slave *slave, *least_loaded;
-	s64 max_gap;
-	int i, found = 0;
-
-	/* Find the first enabled slave */
-	bond_for_each_slave(bond, slave, i) {
-		if (SLAVE_IS_OK(slave)) {
-			found = 1;
-			break;
-		}
-	}
-
-	if (!found) {
-		return NULL;
-	}
+	long long max_gap;
+	int i;
 
-	least_loaded = slave;
-	max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */
-			(s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
+	least_loaded = NULL;
+	max_gap = LLONG_MIN;
 
 	/* Find the slave with the largest gap */
-	bond_for_each_slave_from(bond, slave, i, least_loaded) {
+	bond_for_each_slave(bond, slave, i) {
 		if (SLAVE_IS_OK(slave)) {
-			s64 gap = (s64)(slave->speed << 20) -
-					(s64)(SLAVE_TLB_INFO(slave).load << 3);
+			long long gap = compute_gap(slave);
+
 			if (max_gap < gap) {
 				least_loaded = slave;
 				max_gap = gap;