linux-kernel - [tip:sched/core] sched: Remove superfluous resetting of the p-> dl

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Message-ID: <tip-6713c3aa7f63626c0cecf9c509fb48d885b2dd12@git.kernel.org>
Date:	Fri, 19 Jun 2015 11:02:46 -0700
From:	tip-bot for Wanpeng Li <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	wanpeng.li@...ux.intel.com, peterz@...radead.org,
	torvalds@...ux-foundation.org, juri.lelli@....com, bp@...en8.de,
	akpm@...ux-foundation.org, hpa@...or.com
Subject: [tip:sched/core] sched: Remove superfluous resetting of the p->
 dl_throttled flag

Commit-ID:  6713c3aa7f63626c0cecf9c509fb48d885b2dd12
Gitweb:     http://git.kernel.org/tip/6713c3aa7f63626c0cecf9c509fb48d885b2dd12
Author:     Wanpeng Li <wanpeng.li@...ux.intel.com>
AuthorDate: Wed, 13 May 2015 14:01:06 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 19 Jun 2015 10:06:47 +0200

sched: Remove superfluous resetting of the p->dl_throttled flag

Resetting the p->dl_throttled flag in rt_mutex_setprio() (for a task that is going
to be boosted) is superfluous, as the natural place to do so is in
replenish_dl_entity().

If the task was on the runqueue and it is boosted by a DL task, it will be enqueued
back with ENQUEUE_REPLENISH flag set, which can guarantee that dl_throttled is
reset in replenish_dl_entity().

This patch drops the resetting of throttled status in function rt_mutex_setprio().

Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Juri Lelli <juri.lelli@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1431496867-4194-6-git-send-email-wanpeng.li@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1428c7c..10338ce 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3099,7 +3099,6 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
 		if (!dl_prio(p->normal_prio) ||
 		    (pi_task && dl_entity_preempt(&pi_task->dl, &p->dl))) {
 			p->dl.dl_boosted = 1;
-			p->dl.dl_throttled = 0;
 			enqueue_flag = ENQUEUE_REPLENISH;
 		} else
 			p->dl.dl_boosted = 0;
--
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