linux-kernel - [tip:sched/core] sched: Remove rcu_read_lock() from wake

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Date:	Fri, 1 Jul 2011 15:16:25 GMT
From:	"tip-bot for Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	nikunj@...ux.vnet.ibm.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Remove rcu_read_lock() from wake_affine()

Commit-ID:  2a46dae38087e62dd5fb08a6dadf1407717ed13c
Gitweb:     http://git.kernel.org/tip/2a46dae38087e62dd5fb08a6dadf1407717ed13c
Author:     Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
AuthorDate: Tue, 7 Jun 2011 15:43:22 +0530
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 1 Jul 2011 10:39:06 +0200

sched: Remove rcu_read_lock() from wake_affine()

wake_affine() is only called from one path: select_task_rq_fair(),
which already has the RCU read lock held.

Signed-off-by: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20110607101251.777.34547.stgit@IBM-009124035060.in.ibm.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_fair.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 433491c..eb98f77 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1481,7 +1481,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
 	 * effect of the currently running task from the load
 	 * of the current CPU:
 	 */
-	rcu_read_lock();
 	if (sync) {
 		tg = task_group(current);
 		weight = current->se.load.weight;
@@ -1517,7 +1516,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
 		balanced = this_eff_load <= prev_eff_load;
 	} else
 		balanced = true;
-	rcu_read_unlock();
 
 	/*
 	 * If the currently running task will sleep within
--
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