Index: linux-2.6.19-rc3/kernel/sched.c
===================================================================
--- linux-2.6.19-rc3.orig/kernel/sched.c 2006-10-27 15:43:45.467245352 -0500
+++ linux-2.6.19-rc3/kernel/sched.c 2006-10-27 15:45:30.794096498 -0500
@@ -2849,10 +2849,16 @@ static void update_load(struct rq *this_
* Balancing parameters are set up in arch_init_sched_domains.
*/
static void
-rebalance_tick(int this_cpu, struct rq *this_rq, enum idle_type idle)
+rebalance_tick(int this_cpu, struct rq *this_rq)
{
unsigned long interval;
struct sched_domain *sd;
+ /*
+ * A task is idle if this is the idle queue
+ * and we have no runnable task
+ */
+ enum idle_type idle = (this_rq->idle && !this_rq->nr_running) ?
+ SCHED_IDLE : NOT_IDLE;
for_each_domain(this_cpu, sd) {
if (!(sd->flags & SD_LOAD_BALANCE))
@@ -2884,37 +2890,26 @@ rebalance_tick(int this_cpu, struct rq *
/*
* on UP we do not need to balance between CPUs:
*/
-static inline void rebalance_tick(int cpu, struct rq *rq)
-{
-}
static inline void idle_balance(int cpu, struct rq *rq)
{
}
-static inline void update_load(struct rq *this_rq)
-{
-}
#endif
-static inline int wake_priority_sleeper(struct rq *rq)
+static inline void wake_priority_sleeper(struct rq *rq)
{
- int ret = 0;
-
#ifdef CONFIG_SCHED_SMT
if (!rq->nr_running)
- return 0;
+ return;
spin_lock(&rq->lock);
/*
* If an SMT sibling task has been put to sleep for priority
* reasons reschedule the idle task to see if it can now run.
*/
- if (rq->nr_running) {
+ if (rq->nr_running)
resched_task(rq->idle);
- ret = 1;
- }
spin_unlock(&rq->lock);
#endif
- return ret;
}
DEFINE_PER_CPU(struct kernel_stat, kstat);
@@ -3130,20 +3125,20 @@ void scheduler_tick(void)
struct task_struct *p = current;
int cpu = smp_processor_id();
struct rq *rq = cpu_rq(cpu);
- enum idle_type idle = NOT_IDLE;
update_cpu_clock(p, rq, now);
rq->timestamp_last_tick = now;
- if (p == rq->idle) {
+ if (p == rq->idle)
/* Task on the idle queue */
- if (!wake_priority_sleeper(rq))
- idle = SCHED_IDLE;
- } else
+ wake_priority_sleeper(rq);
+ else
task_running_tick(rq, p);
+#ifdef CONFIG_SMP
update_load(rq);
- rebalance_tick(cpu, rq, idle);
+ rebalance_tick(cpu, rq);
+#endif
}
#ifdef CONFIG_SCHED_SMT
-
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