> ---
> mm/memcontrol.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> Index: b/mm/memcontrol.c
> ===================================================================
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -747,10 +747,22 @@ int mem_cgroup_prepare_migration(struct
> /* remove redundant charge if migration failed*/
> void mem_cgroup_end_migration(struct page *newpage)
> {
> - /* At success, page->mapping is not NULL and nothing to do. */
> + /*
> + * At success, page->mapping is not NULL.
> + * special rollback care is necessary when
> + * 1. at migration failure. (newpage->mapping is cleared in this case)
> + * 2. the newpage was moved but not remapped again because the task
> + * exits and the newpage is obsolete. In this case, the new page
> + * may be a swapcache. So, we just call mem_cgroup_uncharge_page()
> + * always for avoiding mess. The page_cgroup will be removed if
> + * unnecessary. File cache pages is still on radix-tree. Don't
> + * care it.
> + */
> if (!newpage->mapping)
> __mem_cgroup_uncharge_common(newpage,
> MEM_CGROUP_CHARGE_TYPE_FORCE);
> + else if (PageAnon(newpage))
> + mem_cgroup_uncharge_page(newpage);
> }
>
> /*
>
>
> --
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