diff options
| -rw-r--r-- | include/linux/memcontrol.h | 5 | ||||
| -rw-r--r-- | mm/ksm.c | 11 | ||||
| -rw-r--r-- | mm/memcontrol.c | 17 | ||||
| -rw-r--r-- | mm/migrate.c | 2 | ||||
| -rw-r--r-- | mm/swap_state.c | 10 |
5 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index b80de520670..4d34356fe64 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -129,6 +129,7 @@ extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, extern void mem_cgroup_replace_page_cache(struct page *oldpage, struct page *newpage); +extern void mem_cgroup_reset_owner(struct page *page); #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP extern int do_swap_account; #endif @@ -391,6 +392,10 @@ static inline void mem_cgroup_replace_page_cache(struct page *oldpage, struct page *newpage) { } + +static inline void mem_cgroup_reset_owner(struct page *page) +{ +} #endif /* CONFIG_CGROUP_MEM_CONT */ #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM) @@ -28,6 +28,7 @@ #include <linux/kthread.h> #include <linux/wait.h> #include <linux/slab.h> +#include <linux/memcontrol.h> #include <linux/rbtree.h> #include <linux/memory.h> #include <linux/mmu_notifier.h> @@ -1571,6 +1572,16 @@ struct page *ksm_does_need_to_copy(struct page *page, new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); if (new_page) { + /* + * The memcg-specific accounting when moving + * pages around the LRU lists relies on the + * page's owner (memcg) to be valid. Usually, + * pages are assigned to a new owner before + * being put on the LRU list, but since this + * is not the case here, the stale owner from + * a previous allocation cycle must be reset. + */ + mem_cgroup_reset_owner(new_page); copy_user_highpage(new_page, page, address, vma); SetPageDirty(new_page); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d58bb5fa440..c74102d6eb5 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3050,6 +3050,23 @@ void mem_cgroup_uncharge_end(void) batch->memcg = NULL; } +/* + * A function for resetting pc->mem_cgroup for newly allocated pages. + * This function should be called if the newpage will be added to LRU + * before start accounting. + */ +void mem_cgroup_reset_owner(struct page *newpage) +{ + struct page_cgroup *pc; + + if (mem_cgroup_disabled()) + return; + + pc = lookup_page_cgroup(newpage); + VM_BUG_ON(PageCgroupUsed(pc)); + pc->mem_cgroup = root_mem_cgroup; +} + #ifdef CONFIG_SWAP /* * called after __delete_from_swap_cache() and drop "page" account. diff --git a/mm/migrate.c b/mm/migrate.c index 89ea0854332..fc391985899 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -777,6 +777,8 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private, if (!newpage) return -ENOMEM; + mem_cgroup_reset_owner(newpage); + if (page_count(page) == 1) { /* page was freed from under us. So we are done. */ goto out; diff --git a/mm/swap_state.c b/mm/swap_state.c index ea6b32d6187..470038a9187 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -300,6 +300,16 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, new_page = alloc_page_vma(gfp_mask, vma, addr); if (!new_page) break; /* Out of memory */ + /* + * The memcg-specific accounting when moving + * pages around the LRU lists relies on the + * page's owner (memcg) to be valid. Usually, + * pages are assigned to a new owner before + * being put on the LRU list, but since this + * is not the case here, the stale owner from + * a previous allocation cycle must be reset. + */ + mem_cgroup_reset_owner(new_page); } /* |