linux-kernel - Re: [PATCH] sched: remove noop in pre_schedule

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Message-ID: <BANLkTi=N8cm_9OKk8VCPVxPPn+Ejuhzq6w@mail.gmail.com>
Date:	Fri, 27 May 2011 17:17:47 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sched: remove noop in pre_schedule_rt()

On Thu, May 26, 2011 at 9:08 PM, Hillf Danton <dhillf@...il.com> wrote:
> Checking task to be RT is removed since only RT task is served here.
>
> Signed-off-by: Hillf Danton <dhillf@...il.com>

Actually this patch has been raised for two times:
https://lkml.org/lkml/2010/12/13/622
http://lkml.org/lkml/2010/2/9/139

Thanks,
Yong

> ---
>
> --- tip-git/kernel/sched_rt.c   Sun May 22 20:12:01 2011
> +++ sched_rt.c  Thu May 26 21:11:19 2011
> @@ -1516,7 +1516,7 @@ skip:
>  static void pre_schedule_rt(struct rq *rq, struct task_struct *prev)
>  {
>        /* Try to pull RT tasks here if we lower this rq's prio */
> -       if (unlikely(rt_task(prev)) && rq->rt.highest_prio.curr > prev->prio)
> +       if (rq->rt.highest_prio.curr > prev->prio)
>                pull_rt_task(rq);
>  }
>



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