From 8e6ac7fab374816de9a8b0a8fbb02ef761a30ff4 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Tue, 31 Jul 2012 16:42:27 -0700 Subject: hugetlb/cgroup: migrate hugetlb cgroup info from oldpage to new page during migration With HugeTLB pages, hugetlb cgroup is uncharged in compound page destructor. Since we are holding a hugepage reference, we can be sure that old page won't get uncharged till the last put_page(). Signed-off-by: Aneesh Kumar K.V Cc: David Rientjes Acked-by: KAMEZAWA Hiroyuki Cc: Hillf Danton Cc: Michal Hocko Cc: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/hugetlb_cgroup.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'mm/hugetlb_cgroup.c') 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, -- cgit v1.2.3