linux-kernel - [tip:sched/core] sched/fair: Initialize task load and utilization before placing task on rq

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Date:	Sun, 13 Sep 2015 04:05:13 -0700
From:	tip-bot for Morten Rasmussen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	morten.rasmussen@....com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, tglx@...utronix.de, Juri.Lelli@....com,
	Dietmar.Eggemann@....com, mingo@...nel.org, hpa@...or.com,
	efault@....de, mingo@...hat.com, torvalds@...ux-foundation.org
Subject: [tip:sched/core] sched/fair:
  Initialize task load and utilization before placing task on rq

Commit-ID:  98d8fd8126676f7ba6e133e65b2ca4b17989d32c
Gitweb:     http://git.kernel.org/tip/98d8fd8126676f7ba6e133e65b2ca4b17989d32c
Author:     Morten Rasmussen <morten.rasmussen@....com>
AuthorDate: Fri, 14 Aug 2015 17:23:14 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 13 Sep 2015 09:52:58 +0200

sched/fair: Initialize task load and utilization before placing task on rq

Task load or utilization is not currently considered in
select_task_rq_fair(), but if we want that in the future we should make
sure it is not zero for new tasks.

cc: Ingo Molnar <mingo@...hat.com>
cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Dietmar Eggemann <Dietmar.Eggemann@....com>
Cc: Juri Lelli <Juri.Lelli@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: daniel.lezcano@...aro.org
Cc: mturquette@...libre.com
Cc: pang.xunlei@....com.cn
Cc: rjw@...ysocki.net
Cc: sgurrappadi@...dia.com
Cc: vincent.guittot@...aro.org
Cc: yuyang.du@...el.com
Link: http://lkml.kernel.org/r/1439569394-11974-7-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b621271..6ab415a 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2343,6 +2343,8 @@ void wake_up_new_task(struct task_struct *p)
 	struct rq *rq;
 
 	raw_spin_lock_irqsave(&p->pi_lock, flags);
+	/* Initialize new task's runnable average */
+	init_entity_runnable_average(&p->se);
 #ifdef CONFIG_SMP
 	/*
 	 * Fork balancing, do it here and not earlier because:
@@ -2352,8 +2354,6 @@ void wake_up_new_task(struct task_struct *p)
 	set_task_cpu(p, select_task_rq(p, task_cpu(p), SD_BALANCE_FORK, 0));
 #endif
 
-	/* Initialize new task's runnable average */
-	init_entity_runnable_average(&p->se);
 	rq = __task_rq_lock(p);
 	activate_task(rq, p, 0);
 	p->on_rq = TASK_ON_RQ_QUEUED;
--
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