[PATCH 17/30] sched: persistent average load per task

[Peter Zijlstra]

Remove the fall-back to SCHED_LOAD_SCALE by remembering the previous value of
cpu_avg_load_per_task() - this is useful because of the hierarchical group
model in which task weight can be much smaller.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
 kernel/sched.c |   25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -554,6 +554,8 @@ struct rq {
 	int cpu;
 	int online;
 
+	unsigned long avg_load_per_task;
+
 	struct task_struct *migration_thread;
 	struct list_head migration_queue;
 #endif
@@ -1427,9 +1429,18 @@ static inline void dec_cpu_load(struct r
 #ifdef CONFIG_SMP
 static unsigned long source_load(int cpu, int type);
 static unsigned long target_load(int cpu, int type);
-static unsigned long cpu_avg_load_per_task(int cpu);
 static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
 
+static unsigned long cpu_avg_load_per_task(int cpu)
+{
+	struct rq *rq = cpu_rq(cpu);
+
+	if (rq->nr_running)
+		rq->avg_load_per_task = rq->load.weight / rq->nr_running;
+
+	return rq->avg_load_per_task;
+}
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
 
 typedef void (*tg_visitor)(struct task_group *, int, struct sched_domain *);
@@ -2011,18 +2022,6 @@ static unsigned long target_load(int cpu
 }
 
 /*
- * Return the average load per task on the cpu's run queue
- */
-static unsigned long cpu_avg_load_per_task(int cpu)
-{
-	struct rq *rq = cpu_rq(cpu);
-	unsigned long total = weighted_cpuload(cpu);
-	unsigned long n = rq->nr_running;
-
-	return n ? total / n : SCHED_LOAD_SCALE;
-}
-
-/*
  * find_idlest_group finds and returns the least busy CPU group within the
  * domain.
  */

-- 

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