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From: Wanpeng Li <wanpeng.li@linux.intel.com>
To: Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@arm.com>,
	linux-kernel@vger.kernel.org,
	Wanpeng Li <wanpeng.li@linux.intel.com>
Subject: [PATCH v3 1/2] sched/deadline: don't need to check throttled status when switched to dl
Date: Tue, 17 Mar 2015 19:15:30 +0800	[thread overview]
Message-ID: <1426590931-4639-1-git-send-email-wanpeng.li@linux.intel.com> (raw)

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@arm.com>
Signed-off-by: Wanpeng Li <wanpeng.li@linux.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


             reply	other threads:[~2015-03-17 11:33 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-17 11:15 Wanpeng Li [this message]
2015-03-17 11:15 ` [PATCH v3 2/2] sched/deadline: fix rt runtime corrupt when dl refuse a smaller bandwidth Wanpeng Li
2015-03-27 11:44   ` [tip:sched/core] sched/deadline: Fix rt runtime corruption when dl fails its global constraints tip-bot for Wanpeng Li
2015-03-19  4:20 ` [PATCH v3 1/2] sched/deadline: don't need to check throttled status when switched to dl Wanpeng Li
2015-03-27 11:43 ` [tip:sched/core] sched/deadline: Avoid a superfluous check tip-bot for Wanpeng Li

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