linux-kernel - [PATCH v9 3/4] sched: Init cfs_rq's sched

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Date:	Tue, 23 Jun 2015 08:08:04 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	mingo@...nel.org, peterz@...radead.org,
	linux-kernel@...r.kernel.org
Cc:	pjt@...gle.com, bsegall@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	len.brown@...el.com, rafael.j.wysocki@...el.com,
	fengguang.wu@...el.com, boqun.feng@...il.com,
	srikar@...ux.vnet.ibm.com, Yuyang Du <yuyang.du@...el.com>
Subject: [PATCH v9 3/4] sched: Init cfs_rq's sched_entity load average

The runnable load and utilization averages of cfs_rq's sched_entity
were not initiated. Like done to a task, give new cfs_rq' sched_entity
start values to heavy its load in infant time.

Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
 kernel/sched/core.c  |  2 +-
 kernel/sched/fair.c  | 11 ++++++-----
 kernel/sched/sched.h |  2 +-
 3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4dfab27..2d4c597 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2112,7 +2112,7 @@ void wake_up_new_task(struct task_struct *p)
 #endif
 
 	/* Initialize new task's runnable average */
-	init_task_runnable_average(p);
+	init_entity_runnable_average(&p->se);
 	rq = __task_rq_lock(p);
 	activate_task(rq, p, 0);
 	p->on_rq = TASK_ON_RQ_QUEUED;
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 452c932..c1772bf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -672,10 +672,10 @@ static unsigned long task_h_load(struct task_struct *p);
 #define LOAD_AVG_MAX 47742 /* maximum possible load avg */
 #define LOAD_AVG_MAX_N 345 /* number of full periods to produce LOAD_MAX_AVG */
 
-/* Give new task start runnable values to heavy its load in infant time */
-void init_task_runnable_average(struct task_struct *p)
+/* Give new sched_entity start runnable values to heavy its load in infant time */
+void init_entity_runnable_average(struct sched_entity *se)
 {
-	struct sched_avg *sa = &p->se.avg;
+	struct sched_avg *sa = &se->avg;
 
 	sa->last_update_time = 0;
 	/*
@@ -684,14 +684,14 @@ void init_task_runnable_average(struct task_struct *p)
 	 * will definitely be update (after enqueue).
 	 */
 	sa->period_contrib = 1023;
-	sa->load_avg = scale_load_down(p->se.load.weight);
+	sa->load_avg = scale_load_down(se->load.weight);
 	sa->load_sum = sa->load_avg * LOAD_AVG_MAX;
 	sa->util_avg = scale_load_down(SCHED_LOAD_SCALE);
 	sa->util_sum = LOAD_AVG_MAX;
 	/* when this task enqueue'ed, it will contribute to its cfs_rq's load_avg */
 }
 #else
-void init_task_runnable_average(struct task_struct *p)
+void init_entity_runnable_average(struct sched_entity *se)
 {
 }
 #endif
@@ -8055,6 +8055,7 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
 
 		init_cfs_rq(cfs_rq);
 		init_tg_cfs_entry(tg, cfs_rq, se, i, parent->se[i]);
+		init_entity_runnable_average(se);
 	}
 
 	return 1;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 3dfec8d..f2b17ea 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1293,7 +1293,7 @@ extern void init_dl_task_timer(struct sched_dl_entity *dl_se);
 
 unsigned long to_ratio(u64 period, u64 runtime);
 
-extern void init_task_runnable_average(struct task_struct *p);
+extern void init_entity_runnable_average(struct sched_entity *se);
 
 static inline void add_nr_running(struct rq *rq, unsigned count)
 {
-- 
2.1.4

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