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-rw-r--r--mm/hugetlb_cgroup.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index d1ca1196e62f..680e4819e077 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -386,6 +386,26 @@ int __init hugetlb_cgroup_file_init(int idx)
return 0;
}
+void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
+{
+ struct hugetlb_cgroup *h_cg;
+
+ if (hugetlb_cgroup_disabled())
+ return;
+
+ VM_BUG_ON(!PageHuge(oldhpage));
+ spin_lock(&hugetlb_lock);
+ h_cg = hugetlb_cgroup_from_page(oldhpage);
+ set_hugetlb_cgroup(oldhpage, NULL);
+ cgroup_exclude_rmdir(&h_cg->css);
+
+ /* move the h_cg details to new cgroup */
+ set_hugetlb_cgroup(newhpage, h_cg);
+ spin_unlock(&hugetlb_lock);
+ cgroup_release_and_wakeup_rmdir(&h_cg->css);
+ return;
+}
+
struct cgroup_subsys hugetlb_subsys = {
.name = "hugetlb",
.create = hugetlb_cgroup_create,