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sched: task_group hierarchy

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

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-04-19 19:45:00 +02:00 committed by Ingo Molnar
parent eff766a65c
commit f473aa5e02
1 changed files with 20 additions and 0 deletions
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20
kernel/sched.c
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@ -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);