Commit 98d8fd81 authored Aug 14, 2015 by Morten Rasmussen Committed by Ingo Molnar Sep 13, 2015

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@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dietmar Eggemann <Dietmar.Eggemann@arm.com>
Cc: Juri Lelli <Juri.Lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: daniel.lezcano@linaro.org
Cc: mturquette@baylibre.com
Cc: pang.xunlei@zte.com.cn
Cc: rjw@rjwysocki.net
Cc: sgurrappadi@nvidia.com
Cc: vincent.guittot@linaro.org
Cc: yuyang.du@intel.com
Link: http://lkml.kernel.org/r/1439569394-11974-7-git-send-email-morten.rasmussen@arm.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 231678b7

kernel/sched/core.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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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