linux-kernel - Re: [PATCH] sched/fair: fix select_task_rq

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Date:	Thu, 04 Dec 2014 19:10:27 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Vincent Guittot'" <vincent.guittot@...aro.org>,
	"'Liu, Chuansheng'" <chuansheng.liu@...el.com>
Cc:	"'Zhang, Jun'" <jun.zhang@...el.com>,
	"'Ingo Molnar'" <mingo@...hat.com>,
	"'Peter Zijlstra'" <peterz@...radead.org>,
	"'linux-kernel'" <linux-kernel@...r.kernel.org>,
	"'Liu, Changcheng'" <changcheng.liu@...el.com>
Subject: Re: [PATCH] sched/fair: fix select_task_rq_fair return -1

> 
> The change below  will give a similar behavior than 3.18 for 3.14 and
> we still match the condition if (new_cpu == -1 || new_cpu == cpu) in
> 
And -1 is no longer needed.

> order to go in the child level
> 
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -4151,7 +4151,7 @@ static int
>  find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
>  {
>         unsigned long load, min_load = ULONG_MAX;
> -       int idlest = -1;
> +       int idlest = this_cpu;
>         int i;
> 
>         /* Traverse only the allowed CPUs */
> 

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