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

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Date:	Mon, 11 Aug 2014 17:05:57 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	alex.shi@...el.com, vincent.guittot@...aro.org,
	peterz@...radead.org, pjt@...gle.com, efault@....de,
	rjw@...ysocki.net, morten.rasmussen@....com,
	svaidy@...ux.vnet.ibm.com, arjan@...ux.intel.com, mingo@...nel.org
Cc:	nicolas.pitre@...aro.org, len.brown@...el.com, yuyang.du@...el.com,
	linaro-kernel@...ts.linaro.org, daniel.lezcano@...aro.org,
	corbet@....net, catalin.marinas@....com, markgross@...gnar.org,
	sundar.iyer@...el.com, linux-kernel@...r.kernel.org,
	dietmar.eggemann@....com, Lorenzo.Pieralisi@....com,
	mike.turquette@...aro.org, akpm@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de
Subject: [RFC PATCH V2 07/19] sched: add new sg/sd_lb_stats fields for
 incoming fork/exec/wake balancing

From: Alex Shi <alex.shi@...el.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@...el.com>
[Added CONFIG_SCHED_POWER switch to enable this patch]
Signed-off-by: Preeti U Murthy <preeti@...ux.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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