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sched: task_group hierarchy
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>
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@ -271,6 +271,10 @@ struct task_group {
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struct rcu_head rcu;
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struct list_head list;
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struct task_group *parent;
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struct list_head siblings;
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struct list_head children;
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};
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#ifdef CONFIG_USER_SCHED
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@ -7578,6 +7582,13 @@ void __init sched_init(void)
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#ifdef CONFIG_GROUP_SCHED
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list_add(&init_task_group.list, &task_groups);
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INIT_LIST_HEAD(&init_task_group.children);
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#ifdef CONFIG_USER_SCHED
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INIT_LIST_HEAD(&root_task_group.children);
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init_task_group.parent = &root_task_group;
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list_add(&init_task_group.siblings, &root_task_group.children);
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#endif
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#endif
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for_each_possible_cpu(i) {
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@ -8039,6 +8050,12 @@ struct task_group *sched_create_group(struct task_group *parent)
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register_rt_sched_group(tg, i);
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}
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list_add_rcu(&tg->list, &task_groups);
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WARN_ON(!parent); /* root should already exist */
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tg->parent = parent;
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list_add_rcu(&tg->siblings, &parent->children);
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INIT_LIST_HEAD(&tg->children);
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spin_unlock_irqrestore(&task_group_lock, flags);
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return tg;
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@ -8067,6 +8084,7 @@ void sched_destroy_group(struct task_group *tg)
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unregister_rt_sched_group(tg, i);
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}
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list_del_rcu(&tg->list);
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list_del_rcu(&tg->siblings);
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spin_unlock_irqrestore(&task_group_lock, flags);
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/* wait for possible concurrent references to cfs_rqs complete */
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@ -8162,6 +8180,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
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spin_lock_irqsave(&task_group_lock, flags);
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for_each_possible_cpu(i)
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unregister_fair_sched_group(tg, i);
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list_del_rcu(&tg->siblings);
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spin_unlock_irqrestore(&task_group_lock, flags);
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/* wait for any ongoing reference to this group to finish */
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@ -8182,6 +8201,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
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spin_lock_irqsave(&task_group_lock, flags);
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for_each_possible_cpu(i)
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register_fair_sched_group(tg, i);
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list_add_rcu(&tg->siblings, &tg->parent->children);
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spin_unlock_irqrestore(&task_group_lock, flags);
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done:
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mutex_unlock(&shares_mutex);
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