diff options
| -rw-r--r-- | mm/memcontrol.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 7bb14fdc780c..81b0ae8183d0 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -994,13 +994,24 @@ nomem: static struct mem_cgroup *try_get_mem_cgroup_from_swapcache(struct page *page) { struct mem_cgroup *mem; + struct page_cgroup *pc; swp_entry_t ent; + VM_BUG_ON(!PageLocked(page)); + if (!PageSwapCache(page)) return NULL; - ent.val = page_private(page); - mem = lookup_swap_cgroup(ent); + pc = lookup_page_cgroup(page); + /* + * Used bit of swapcache is solid under page lock. + */ + if (PageCgroupUsed(pc)) + mem = pc->mem_cgroup; + else { + ent.val = page_private(page); + mem = lookup_swap_cgroup(ent); + } if (!mem) return NULL; if (!css_tryget(&mem->css)) |