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sched: Remove rcu_read_lock() from wake_affine()
author
Nikunj A. Dadhania
<nikunj@linux.vnet.ibm.com>
Tue, 7 Jun 2011 10:13:22 +0000
(15:43 +0530)
committer
Ingo Molnar
<mingo@elte.hu>
Fri, 1 Jul 2011 08:39:06 +0000
(10:39 +0200)
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@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link:
http://lkml.kernel.org/r/20110607101251.777.34547.stgit@IBM-009124035060.in.ibm.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/sched_fair.c
patch
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diff --git
a/kernel/sched_fair.c
b/kernel/sched_fair.c
index 433491c2dc8f5c9952655de72958c7019dadd57f..eb98f77b38ef72d0072de05baa7818dbc4748770 100644
(file)
--- 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