linux-kernel - [PATCH v3 1/2] sched/deadline: don't need to check throttled status when switched to dl

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Message-Id: <1426590931-4639-1-git-send-email-wanpeng.li@linux.intel.com>
Date:	Tue, 17 Mar 2015 19:15:30 +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 v3 1/2] sched/deadline: don't need to check throttled status when switched to dl

After commit 40767b0dc768 ("sched/deadline: Fix deadline parameter
modification handling") is merged, deadline task throttled status 
is cleared each time once switch from dl class, so throttled status 
always doesn't set when switch back, there is no need to check 
throttled status, this patch drop the check.

Acked-by: Juri Lelli <juri.lelli@....com>
Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
---
v2 -> v3:
 * update changelog

 kernel/sched/deadline.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 27b9381..eed6529 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1722,14 +1722,6 @@ 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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