Commit f473aa5e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: task_group hierarchy 



Add the full parent<->child relation thing into task_groups as well.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent eff766a6

kernel/sched.c

+20 −0
Original line number Diff line number Diff line
@@ -271,6 +271,10 @@ struct task_group { 


	struct rcu_head rcu;

	struct list_head list;



	struct task_group *parent;

	struct list_head siblings;

	struct list_head children;

};



#ifdef CONFIG_USER_SCHED
@@ -7578,6 +7582,13 @@ void __init sched_init(void) 


#ifdef CONFIG_GROUP_SCHED

	list_add(&init_task_group.list, &task_groups);

	INIT_LIST_HEAD(&init_task_group.children);



#ifdef CONFIG_USER_SCHED

	INIT_LIST_HEAD(&root_task_group.children);

	init_task_group.parent = &root_task_group;

	list_add(&init_task_group.siblings, &root_task_group.children);

#endif

#endif



	for_each_possible_cpu(i) {
@@ -8039,6 +8050,12 @@ struct task_group *sched_create_group(struct task_group *parent) 
		register_rt_sched_group(tg, i);

	}

	list_add_rcu(&tg->list, &task_groups);



	WARN_ON(!parent); /* root should already exist */



	tg->parent = parent;

	list_add_rcu(&tg->siblings, &parent->children);

	INIT_LIST_HEAD(&tg->children);

	spin_unlock_irqrestore(&task_group_lock, flags);



	return tg;
@@ -8067,6 +8084,7 @@ void sched_destroy_group(struct task_group *tg) 
		unregister_rt_sched_group(tg, i);

	}

	list_del_rcu(&tg->list);

	list_del_rcu(&tg->siblings);

	spin_unlock_irqrestore(&task_group_lock, flags);



	/* wait for possible concurrent references to cfs_rqs complete */
@@ -8162,6 +8180,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares) 
	spin_lock_irqsave(&task_group_lock, flags);

	for_each_possible_cpu(i)

		unregister_fair_sched_group(tg, i);

	list_del_rcu(&tg->siblings);

	spin_unlock_irqrestore(&task_group_lock, flags);



	/* wait for any ongoing reference to this group to finish */
@@ -8182,6 +8201,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares) 
	spin_lock_irqsave(&task_group_lock, flags);

	for_each_possible_cpu(i)

		register_fair_sched_group(tg, i);

	list_add_rcu(&tg->siblings, &tg->parent->children);

	spin_unlock_irqrestore(&task_group_lock, flags);

done:

	mutex_unlock(&shares_mutex);