linux-kernel - [tip:sched/core] sched/deadline: Avoid a superfluous check

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Message-ID: <tip-bd4bde14b93cce8fa77765ff709e0be55abdba2c@git.kernel.org>
Date:	Fri, 27 Mar 2015 04:43:48 -0700
From:	tip-bot for Wanpeng Li <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, juri.lelli@....com,
	wanpeng.li@...ux.intel.com, peterz@...radead.org, mingo@...nel.org,
	hpa@...or.com, tglx@...utronix.de
Subject: [tip:sched/core] sched/deadline: Avoid a superfluous check

Commit-ID:  bd4bde14b93cce8fa77765ff709e0be55abdba2c
Gitweb:     http://git.kernel.org/tip/bd4bde14b93cce8fa77765ff709e0be55abdba2c
Author:     Wanpeng Li <wanpeng.li@...ux.intel.com>
AuthorDate: Tue, 17 Mar 2015 19:15:30 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 27 Mar 2015 09:36:12 +0100

sched/deadline: Avoid a superfluous check

Since commit 40767b0dc768 ("sched/deadline: Fix deadline parameter
modification handling") we clear the thottled state when switching
from a dl task, therefore we should never find it set in switching to
a dl task.

Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
[ Improved the changelog. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Juri Lelli <juri.lelli@....com>
Link: http://lkml.kernel.org/r/1426590931-4639-1-git-send-email-wanpeng.li@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/deadline.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 0a81a95..24c18dc 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1665,14 +1665,6 @@ 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 &&
--
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