sched: split out css_online/css_offline from tg creation/destruction

[pandora-kernel.git] / kernel / sched / core.c

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 257002c..1061672 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7159,7 +7159,6 @@ static void free_sched_group(struct task_group *tg)
 struct task_group *sched_create_group(struct task_group *parent)
 {
        struct task_group *tg;
-       unsigned long flags;
 
        tg = kzalloc(sizeof(*tg), GFP_KERNEL);
        if (!tg)
@@ -7171,6 +7170,17 @@ struct task_group *sched_create_group(struct task_group *parent)
        if (!alloc_rt_sched_group(tg, parent))
                goto err;
 
+       return tg;
+
+err:
+       free_sched_group(tg);
+       return ERR_PTR(-ENOMEM);
+}
+
+void sched_online_group(struct task_group *tg, struct task_group *parent)
+{
+       unsigned long flags;
+
        spin_lock_irqsave(&task_group_lock, flags);
        list_add_rcu(&tg->list, &task_groups);
 
@@ -7180,12 +7190,6 @@ struct task_group *sched_create_group(struct task_group *parent)
        INIT_LIST_HEAD(&tg->children);
        list_add_rcu(&tg->siblings, &parent->children);
        spin_unlock_irqrestore(&task_group_lock, flags);
-
-       return tg;
-
-err:
-       free_sched_group(tg);
-       return ERR_PTR(-ENOMEM);
 }
 
 /* rcu callback to free various structures associated with a task group */
@@ -7197,6 +7201,12 @@ static void free_sched_group_rcu(struct rcu_head *rhp)
 
 /* Destroy runqueue etc associated with a task group */
 void sched_destroy_group(struct task_group *tg)
+{
+       /* wait for possible concurrent references to cfs_rqs complete */
+       call_rcu(&tg->rcu, free_sched_group_rcu);
+}
+
+void sched_offline_group(struct task_group *tg)
 {
        unsigned long flags;
        int i;
@@ -7209,9 +7219,6 @@ void sched_destroy_group(struct task_group *tg)
        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 */
-       call_rcu(&tg->rcu, free_sched_group_rcu);
 }
 
 /* change task's runqueue when it moves between groups.
@@ -7563,6 +7570,19 @@ static struct cgroup_subsys_state *cpu_cgroup_css_alloc(struct cgroup *cgrp)
        return &tg->css;
 }
 
+static int cpu_cgroup_css_online(struct cgroup *cgrp)
+{
+       struct task_group *tg = cgroup_tg(cgrp);
+       struct task_group *parent;
+
+       if (!cgrp->parent)
+               return 0;
+
+       parent = cgroup_tg(cgrp->parent);
+       sched_online_group(tg, parent);
+       return 0;
+}
+
 static void cpu_cgroup_css_free(struct cgroup *cgrp)
 {
        struct task_group *tg = cgroup_tg(cgrp);
@@ -7570,6 +7590,13 @@ static void cpu_cgroup_css_free(struct cgroup *cgrp)
        sched_destroy_group(tg);
 }
 
+static void cpu_cgroup_css_offline(struct cgroup *cgrp)
+{
+       struct task_group *tg = cgroup_tg(cgrp);
+
+       sched_offline_group(tg);
+}
+
 static int cpu_cgroup_can_attach(struct cgroup *cgrp,
                                 struct cgroup_taskset *tset)
 {
@@ -7925,6 +7952,8 @@ struct cgroup_subsys cpu_cgroup_subsys = {
        .name           = "cpu",
        .css_alloc      = cpu_cgroup_css_alloc,
        .css_free       = cpu_cgroup_css_free,
+       .css_online     = cpu_cgroup_css_online,
+       .css_offline    = cpu_cgroup_css_offline,
        .can_attach     = cpu_cgroup_can_attach,
        .attach         = cpu_cgroup_attach,
        .exit           = cpu_cgroup_exit,