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


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