linux-kernel - [RFC PATCH 1/5] sched: get rq runnable load average for load balance

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Message-Id: <1353157457-3649-2-git-send-email-alex.shi@intel.com>
Date:	Sat, 17 Nov 2012 21:04:13 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	mingo@...hat.com, peterz@...radead.org, pjt@...gle.com,
	preeti@...ux.vnet.ibm.com, vincent.guittot@...aro.org
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/5] sched: get rq runnable load average for load balance

In load balance, rq load weight is the core of balance judgement.
Now it's time to consider the PJT's runnable load tracking in load
balance.

Since we already have rq runnable_avg_sum and rq load weight,
the rq runnable load average is easy to get:
	runnable_load(rq) = runnable_avg(rq) * weight(rq)

then reuse rq->avg.load_avg_contrib to store the value.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 kernel/sched/debug.c |    1 +
 kernel/sched/fair.c  |   20 ++++++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 2cd3c1b..1cd5639 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -71,6 +71,7 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group
 		struct sched_avg *avg = &cpu_rq(cpu)->avg;
 		P(avg->runnable_avg_sum);
 		P(avg->runnable_avg_period);
+		P(avg->load_avg_contrib);
 		return;
 	}
 
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a624d3b..bc60e43 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1439,14 +1439,25 @@ static inline void __update_tg_runnable_avg(struct sched_avg *sa,
 static inline void __update_group_entity_contrib(struct sched_entity *se) {}
 #endif
 
-static inline void __update_task_entity_contrib(struct sched_entity *se)
+static inline void __update_load_avg_contrib(struct sched_avg *sa,
+						struct load_weight *load)
 {
 	u32 contrib;
 
 	/* avoid overflowing a 32-bit type w/ SCHED_LOAD_SCALE */
-	contrib = se->avg.runnable_avg_sum * scale_load_down(se->load.weight);
-	contrib /= (se->avg.runnable_avg_period + 1);
-	se->avg.load_avg_contrib = scale_load(contrib);
+	contrib = sa->runnable_avg_sum * scale_load_down(load->weight);
+	contrib /= (sa->runnable_avg_period + 1);
+	sa->load_avg_contrib = scale_load(contrib);
+}
+
+static inline void __update_task_entity_contrib(struct sched_entity *se)
+{
+	__update_load_avg_contrib(&se->avg, &se->load);
+}
+
+static inline void __update_rq_load_contrib(struct rq *rq)
+{
+	__update_load_avg_contrib(&rq->avg, &rq->load);
 }
 
 /* Compute the current contribution to load_avg by se, return any delta */
@@ -1539,6 +1550,7 @@ static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
 {
 	__update_entity_runnable_avg(rq->clock_task, &rq->avg, runnable);
 	__update_tg_runnable_avg(&rq->avg, &rq->cfs);
+	__update_rq_load_contrib(rq);
 }
 
 /* Add the load generated by se into cfs_rq's child load-average */
-- 
1.7.5.4

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