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-rw-r--r--mm/memcontrol.c62
1 files changed, 40 insertions, 22 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 8e0988fe..a931896 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6093,7 +6093,7 @@ err_cleanup:
static struct cgroup_subsys_state * __ref
mem_cgroup_css_alloc(struct cgroup *cont)
{
- struct mem_cgroup *memcg, *parent;
+ struct mem_cgroup *memcg;
long error = -ENOMEM;
int node;
@@ -6108,7 +6108,7 @@ mem_cgroup_css_alloc(struct cgroup *cont)
/* root ? */
if (cont->parent == NULL) {
int cpu;
- parent = NULL;
+
if (mem_cgroup_soft_limit_tree_init())
goto free_out;
root_mem_cgroup = memcg;
@@ -6117,13 +6117,43 @@ mem_cgroup_css_alloc(struct cgroup *cont)
&per_cpu(memcg_stock, cpu);
INIT_WORK(&stock->work, drain_local_stock);
}
- } else {
- parent = mem_cgroup_from_cont(cont->parent);
- memcg->use_hierarchy = parent->use_hierarchy;
- memcg->oom_kill_disable = parent->oom_kill_disable;
+
+ res_counter_init(&memcg->res, NULL);
+ res_counter_init(&memcg->memsw, NULL);
+ res_counter_init(&memcg->kmem, NULL);
}
- if (parent && parent->use_hierarchy) {
+ memcg->last_scanned_node = MAX_NUMNODES;
+ INIT_LIST_HEAD(&memcg->oom_notify);
+ atomic_set(&memcg->refcnt, 1);
+ memcg->move_charge_at_immigrate = 0;
+ mutex_init(&memcg->thresholds_lock);
+ spin_lock_init(&memcg->move_lock);
+
+ return &memcg->css;
+
+free_out:
+ __mem_cgroup_free(memcg);
+ return ERR_PTR(error);
+}
+
+static int
+mem_cgroup_css_online(struct cgroup *cont)
+{
+ struct mem_cgroup *memcg, *parent;
+ int error = 0;
+
+ if (!cont->parent)
+ return 0;
+
+ memcg = mem_cgroup_from_cont(cont);
+ parent = mem_cgroup_from_cont(cont->parent);
+
+ memcg->use_hierarchy = parent->use_hierarchy;
+ memcg->oom_kill_disable = parent->oom_kill_disable;
+ memcg->swappiness = mem_cgroup_swappiness(parent);
+
+ if (parent->use_hierarchy) {
res_counter_init(&memcg->res, &parent->res);
res_counter_init(&memcg->memsw, &parent->memsw);
res_counter_init(&memcg->kmem, &parent->kmem);
@@ -6144,18 +6174,9 @@ mem_cgroup_css_alloc(struct cgroup *cont)
* much sense so let cgroup subsystem know about this
* unfortunate state in our controller.
*/
- if (parent && parent != root_mem_cgroup)
+ if (parent != root_mem_cgroup)
mem_cgroup_subsys.broken_hierarchy = true;
}
- memcg->last_scanned_node = MAX_NUMNODES;
- INIT_LIST_HEAD(&memcg->oom_notify);
-
- if (parent)
- memcg->swappiness = mem_cgroup_swappiness(parent);
- atomic_set(&memcg->refcnt, 1);
- memcg->move_charge_at_immigrate = 0;
- mutex_init(&memcg->thresholds_lock);
- spin_lock_init(&memcg->move_lock);
error = memcg_init_kmem(memcg, &mem_cgroup_subsys);
if (error) {
@@ -6165,12 +6186,8 @@ mem_cgroup_css_alloc(struct cgroup *cont)
* call __mem_cgroup_free, so return directly
*/
mem_cgroup_put(memcg);
- return ERR_PTR(error);
}
- return &memcg->css;
-free_out:
- __mem_cgroup_free(memcg);
- return ERR_PTR(error);
+ return error;
}
static void mem_cgroup_css_offline(struct cgroup *cont)
@@ -6780,6 +6797,7 @@ struct cgroup_subsys mem_cgroup_subsys = {
.name = "memory",
.subsys_id = mem_cgroup_subsys_id,
.css_alloc = mem_cgroup_css_alloc,
+ .css_online = mem_cgroup_css_online,
.css_offline = mem_cgroup_css_offline,
.css_free = mem_cgroup_css_free,
.can_attach = mem_cgroup_can_attach,