[RFC PATCH V2 07/19] sched: add new sg/sd_lb_stats fields for incoming fork/exec/wake balancing

[Preeti U Murthy <preeti@linux.vnet.ibm.com>]

From: Alex Shi <alex.shi@intel.com>

For power aware balancing, we care the sched domain/group's utilization.
So add: sd_lb_stats.sd_util and sg_lb_stats.group_util.

And want to know which group is busiest but still has capability to
handle more tasks, so add: sd_lb_stats.group_leader

Signed-off-by: Alex Shi <alex.shi@intel.com>
[Added CONFIG_SCHED_POWER switch to enable this patch]
Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
---

 kernel/sched/fair.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 681ad06..3d6d081 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5593,6 +5593,9 @@ struct sg_lb_stats {
 	unsigned int nr_numa_running;
 	unsigned int nr_preferred_running;
 #endif
+#ifdef CONFIG_SCHED_POWER
+	unsigned int group_util;	/* sum utilization of group */
+#endif
 };
 
 /*
@@ -5608,6 +5611,12 @@ struct sd_lb_stats {
 
 	struct sg_lb_stats busiest_stat;/* Statistics of the busiest group */
 	struct sg_lb_stats local_stat;	/* Statistics of the local group */
+
+#ifdef CONFIG_SCHED_POWER
+        /* Varibles of power aware scheduling */
+        unsigned int  sd_util;  /* sum utilization of this domain */
+        struct sched_group *group_leader; /* Group which relieves group_min */
+#endif
 };
 
 static inline void init_sd_lb_stats(struct sd_lb_stats *sds)