linux-kernel - Re: [PATCH] sched/deadline: don't need to check throttled status when switched to dl

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Message-ID: <20150305013812.GA2966@kernel>
Date:	Thu, 5 Mar 2015 09:38:12 +0800
From:	Wanpeng Li <wanpeng.li@...ux.intel.com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Juri Lelli <juri.lelli@....com>, linux-kernel@...r.kernel.org,
	Wanpeng Li <wanpeng.li@...ux.intel.com>
Subject: Re: [PATCH] sched/deadline: don't need to check throttled status
 when switched to dl

Ping Juri,
On Thu, Feb 26, 2015 at 12:11:04PM +0800, Wanpeng Li wrote:
>After commit 40767b0dc768 ("sched/deadline: Fix deadline parameter 
>modification handling"), deadline task throttled status is cleared
>each time switch from dl, so throttled status always unset when 
>switch back, there is no need to check throttled status, this patch 
>drop the check.
>
>Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
>---
> kernel/sched/deadline.c | 8 --------
> 1 file changed, 8 deletions(-)
>
>diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
>index ca391c0..cfb8fa7 100644
>--- a/kernel/sched/deadline.c
>+++ b/kernel/sched/deadline.c
>@@ -1697,14 +1697,6 @@ static void switched_to_dl(struct rq *rq, struct task_struct *p)
> {
> 	int check_resched = 1;
> 
>-	/*
>-	 * If p is throttled, don't consider the possibility
>-	 * of preempting rq->curr, the check will be done right
>-	 * after its runtime will get replenished.
>-	 */
>-	if (unlikely(p->dl.dl_throttled))
>-		return;
>-
> 	if (task_on_rq_queued(p) && rq->curr != p) {
> #ifdef CONFIG_SMP
> 		if (p->nr_cpus_allowed > 1 && rq->dl.overloaded &&
>-- 
>1.9.1
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