Remove load staggering.

The timer interrupts already are staggered. For short load balancing
actions we do not need an additional layer of load staggering.

For load balancing on large sched_domains we will add a serialization
later that avoids concurrent load balance operations and thus has
the same effect as load staggering.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.19-rc4-mm2/kernel/sched.c
===================================================================
--- linux-2.6.19-rc4-mm2.orig/kernel/sched.c	2006-11-10 21:13:43.000000000 -0600
+++ linux-2.6.19-rc4-mm2/kernel/sched.c	2006-11-10 21:15:15.153663379 -0600
@@ -2825,16 +2825,10 @@ static void active_load_balance(struct r
  * Balancing parameters are set up in arch_init_sched_domains.
  */
 
-/* Don't have all balancing operations going off at once: */
-static inline unsigned long cpu_offset(int cpu)
-{
-	return jiffies + cpu * HZ / NR_CPUS;
-}
-
 static void
 rebalance_tick(int this_cpu, struct rq *this_rq, enum idle_type idle)
 {
-	unsigned long this_load, interval, j = cpu_offset(this_cpu);
+	unsigned long this_load, interval;
 	struct sched_domain *sd;
 	int i, scale;
 
@@ -2869,7 +2863,7 @@ rebalance_tick(int this_cpu, struct rq *
 		if (unlikely(!interval))
 			interval = 1;
 
-		if (j - sd->last_balance >= interval) {
+		if (jiffies - sd->last_balance >= interval) {
 			if (load_balance(this_cpu, this_rq, sd, idle)) {
 				/*
 				 * We've pulled tasks over so either we're no