linux-kernel - [PATCH v2 1/3] sched: don't repeat the initialization in sched

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Date:	Wed, 05 Jun 2013 10:24:18 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>
Subject: [PATCH v2 1/3] sched: don't repeat the initialization in sched_init()

v2:
	Move comments back before init_tg_cfs_entry(). (Thanks for the notify from pjt)

In sched_init(), there is no need to initialize 'root_task_group.shares' and
'root_task_group.cfs_bandwidth' repeatedly.

CC: Paul Tuner <pjt@...gle.com>
CC: Ingo Molnar <mingo@...nel.org>
CC: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
---
 kernel/sched/core.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 58453b8..96f69da 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6955,6 +6955,11 @@ void __init sched_init(void)
 
 #endif /* CONFIG_CGROUP_SCHED */
 
+#ifdef CONFIG_FAIR_GROUP_SCHED
+	root_task_group.shares = ROOT_TASK_GROUP_LOAD;
+	init_cfs_bandwidth(&root_task_group.cfs_bandwidth);
+#endif
+
 	for_each_possible_cpu(i) {
 		struct rq *rq;
 
@@ -6966,7 +6971,6 @@ void __init sched_init(void)
 		init_cfs_rq(&rq->cfs);
 		init_rt_rq(&rq->rt, rq);
 #ifdef CONFIG_FAIR_GROUP_SCHED
-		root_task_group.shares = ROOT_TASK_GROUP_LOAD;
 		INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
 		/*
 		 * How much cpu bandwidth does root_task_group get?
@@ -6987,7 +6991,6 @@ void __init sched_init(void)
 		 * We achieve this by letting root_task_group's tasks sit
 		 * directly in rq->cfs (i.e root_task_group->se[] = NULL).
 		 */
-		init_cfs_bandwidth(&root_task_group.cfs_bandwidth);
 		init_tg_cfs_entry(&root_task_group, &rq->cfs, NULL, i, NULL);
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
-- 
1.7.4.1

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