linux-kernel - [PATCH 1/2] sched: Minor cleanups

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Date:	Mon, 19 Nov 2007 17:58:28 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	dmitry.adamushko@...il.com, a.p.zijlstra@...llo.nl,
	dhaval@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	efault@....de, skumar@...ux.vnet.ibm.com,
	Balbir Singh <balbir@...ibm.com>
Subject: [PATCH 1/2] sched: Minor cleanups


Minor scheduler cleanups:

- Fix coding style
- remove obsolete comment
- Use list_for_each_entry_rcu when walking task group list


Signed-off-by : Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>

---
 kernel/sched.c      |   21 +++------------------
 kernel/sched_fair.c |    5 ++++-
 2 files changed, 7 insertions(+), 19 deletions(-)

Index: current/kernel/sched.c
===================================================================
--- current.orig/kernel/sched.c
+++ current/kernel/sched.c
@@ -191,12 +191,12 @@ struct task_group init_task_group = {
 };
 
 #ifdef CONFIG_FAIR_USER_SCHED
-# define INIT_TASK_GRP_LOAD	2*NICE_0_LOAD
+# define INIT_TASK_GROUP_LOAD	2*NICE_0_LOAD	/* root user's cpu share */
 #else
-# define INIT_TASK_GRP_LOAD	NICE_0_LOAD
+# define INIT_TASK_GROUP_LOAD	NICE_0_LOAD
 #endif
 
-static int init_task_group_load = INIT_TASK_GRP_LOAD;
+static int init_task_group_load = INIT_TASK_GROUP_LOAD;
 
 /* return group to which a task belongs */
 static inline struct task_group *task_group(struct task_struct *p)
@@ -864,21 +864,6 @@ iter_move_one_task(struct rq *this_rq, i
 
 #define sched_class_highest (&rt_sched_class)
 
-/*
- * Update delta_exec, delta_fair fields for rq.
- *
- * delta_fair clock advances at a rate inversely proportional to
- * total load (rq->load.weight) on the runqueue, while
- * delta_exec advances at the same rate as wall-clock (provided
- * cpu is not idle).
- *
- * delta_exec / delta_fair is a measure of the (smoothened) load on this
- * runqueue over any given interval. This (smoothened) load is used
- * during load balance.
- *
- * This function is called /before/ updating rq->load
- * and when switching tasks.
- */
 static inline void inc_load(struct rq *rq, const struct task_struct *p)
 {
 	update_load_add(&rq->load, p->se.load.weight);
Index: current/kernel/sched_fair.c
===================================================================
--- current.orig/kernel/sched_fair.c
+++ current/kernel/sched_fair.c
@@ -685,7 +685,7 @@ static inline struct cfs_rq *cpu_cfs_rq(
 
 /* Iterate thr' all leaf cfs_rq's on a runqueue */
 #define for_each_leaf_cfs_rq(rq, cfs_rq) \
-	list_for_each_entry(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)
+	list_for_each_entry_rcu(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)
 
 /* Do the two (enqueued) entities belong to the same group ? */
 static inline int
@@ -1126,7 +1126,10 @@ static void print_cfs_stats(struct seq_f
 #ifdef CONFIG_FAIR_GROUP_SCHED
 	print_cfs_rq(m, cpu, &cpu_rq(cpu)->cfs);
 #endif
+
+	rcu_read_lock();
 	for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
 		print_cfs_rq(m, cpu, cfs_rq);
+	rcu_read_unlock();
 }
 #endif

-- 
Regards,
vatsa
-
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