linux-kernel - [PATCH] sched: Proper initialization of root_task

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Message-ID: <20111130054227.GA7808@heechul-desktop>
Date:	Tue, 29 Nov 2011 23:42:29 -0600
From:	Heechul Yun <heechul@...inois.edu>
To:	pjt@...gle.com
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl
Subject: [PATCH] sched: Proper initialization of root_task_group

Hi,

The following patch fix a initialization issue.

Thanks

Heechul

---
The root_task_group.cfs_bandwidth and root_task_group.shares
were initialized multiple times unnecessarily which are corrected
by this patch.

Signed-off-by: Heechul Yun <heechul@...inois.edu>
---
 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 ca8fd44..0ed6978 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6772,6 +6772,11 @@ void __init sched_init(void)
 	autogroup_init(&init_task);
 #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 /* CONFIG_FAIR_GROUP_SCHED */
+
 	for_each_possible_cpu(i) {
 		struct rq *rq;
 
@@ -6783,7 +6788,6 @@ 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?
@@ -6804,7 +6808,6 @@ 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 */
 
-- 
1.7.5.4

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