linux-kernel - Re: [PATCH 4/6] sched/dl: push task away if the deadline is equal to curr during wakeup

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Message-ID: <54511F21.5090506@arm.com>
Date:	Wed, 29 Oct 2014 17:08:49 +0000
From:	Juri Lelli <juri.lelli@....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" <linux-kernel@...r.kernel.org>,
	"juri.lelli@...il.com" <juri.lelli@...il.com>
Subject: Re: [PATCH 4/6] sched/dl: push task away if the deadline is equal
 to curr during wakeup

Hi,

On 27/10/14 01:41, Wanpeng Li wrote:
> This patch pushes task away if the dealine of the task is equal 
> to current during wake up. The same behavior as rt class.
> 

Right.

Thanks,

- Juri

> 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 aa7c27f..97141e2 100644
> --- a/kernel/sched/deadline.c
> +++ b/kernel/sched/deadline.c
> @@ -1492,7 +1492,7 @@ static void task_woken_dl(struct rq *rq, struct task_struct *p)
>  	    p->nr_cpus_allowed > 1 &&
>  	    dl_task(rq->curr) &&
>  	    (rq->curr->nr_cpus_allowed < 2 ||
> -	     dl_entity_preempt(&rq->curr->dl, &p->dl))) {
> +	     !dl_entity_preempt(&p->dl, &rq->curr->dl))) {
>  		push_dl_tasks(rq);
>  	}
>  }
> 

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