linux-kernel - Re: [PATCH 1/2] sched/deadline: don't need to check SD_BALANCE

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Message-ID: <54464F30.9000706@gmail.com>
Date:	Tue, 21 Oct 2014 20:18:56 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Wanpeng Li <wanpeng.li@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, Juri Lelli <juri.lelli@....com>
Subject: Re: [PATCH 1/2] sched/deadline: don't need to check SD_BALANCE_FORK

Cc Juri,

于 10/14/14, 10:22 AM, Wanpeng Li 写道:
> There is no need to do balance during fork since SCHED_DEADLINE 
> tasks can't fork. This patch avoid the SD_BALANCE_FORK check.
>
> Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
> ---
>  kernel/sched/deadline.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
> index abfaf3d..f46b7f1 100644
> --- a/kernel/sched/deadline.c
> +++ b/kernel/sched/deadline.c
> @@ -914,7 +914,7 @@ select_task_rq_dl(struct task_struct *p, int cpu, int sd_flag, int flags)
>  	struct task_struct *curr;
>  	struct rq *rq;
>  
> -	if (sd_flag != SD_BALANCE_WAKE && sd_flag != SD_BALANCE_FORK)
> +	if (sd_flag != SD_BALANCE_WAKE)
>  		goto out;
>  
>  	rq = cpu_rq(cpu);

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