Wanpeng Li <liwp.linux@xxxxxxxxx> writes: > From: Wanpeng Li <liwp@xxxxxxxxxxxxxxxxxx> > > Against linux-next: > > Function alloc_huge_page will call hugetlb_cgroup_charge_cgroup > to charge pages, the compound page have less than 3 pages will not > charge to hugetlb cgroup. When alloc_huge_page fails it will call > hugetlb_cgroup_uncharge_cgroup to uncharge pages, however, > hugetlb_cgroup_uncharge_cgroup doesn't have huge_page_order check. > That means it will uncharge pages even if the compound page have less > than 3 pages. Add huge_page_order check to avoid this incorrectly > uncharge. > > Signed-off-by: Wanpeng Li <liwp.linux@xxxxxxxxx> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > --- > mm/hugetlb_cgroup.c | 3 +++ > 1 files changed, 3 insertions(+), 0 deletions(-) > > diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c > index b834e8d..2b9e214 100644 > --- a/mm/hugetlb_cgroup.c > +++ b/mm/hugetlb_cgroup.c > @@ -252,6 +252,9 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, > > if (hugetlb_cgroup_disabled() || !h_cg) > return; > + > + if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) > + return; > > res_counter_uncharge(&h_cg->hugepage[idx], csize); > return; > -- > 1.7.5.4 -aneesh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>