linux-kernel - Re: [PATCH 1/2] sched/rt: Remove a redundant condition from task_woken

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Message-ID: <20150706151938.225ccc92@gandalf.local.home>
Date:	Mon, 6 Jul 2015 15:19:38 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Xunlei Pang <xlpang@....com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Xunlei Pang <pang.xunlei@...aro.org>
Subject: Re: [PATCH 1/2] sched/rt: Remove a redundant condition from
 task_woken_rt()

On Sat,  4 Jul 2015 15:39:22 +0800
Xunlei Pang <xlpang@....com> wrote:

> From: Xunlei Pang <pang.xunlei@...aro.org>
> 
> p has been already queued at this point, so "!task_running(rq, p)"
> and "p->nr_cpus_allowed > 1" imply that "has_pushable_tasks(rq)" is
> true, so it can be removed.
> 

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> Signed-off-by: Xunlei Pang <pang.xunlei@...aro.org>
> ---
>  kernel/sched/rt.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
> index 0d193a24..00816ee 100644
> --- a/kernel/sched/rt.c
> +++ b/kernel/sched/rt.c
> @@ -2069,7 +2069,6 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
>  {
>  	if (!task_running(rq, p) &&
>  	    !test_tsk_need_resched(rq->curr) &&
> -	    has_pushable_tasks(rq) &&
>  	    p->nr_cpus_allowed > 1 &&
>  	    (dl_task(rq->curr) || rt_task(rq->curr)) &&
>  	    (rq->curr->nr_cpus_allowed < 2 ||

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