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

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Message-Id: <1424923864-3001-1-git-send-email-wanpeng.li@linux.intel.com>
Date:	Thu, 26 Feb 2015 12:11:04 +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: [PATCH] sched/deadline: don't need to check throttled status when switched to dl

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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