memcg: add mem_cgroup_replace_page_cache() to fix LRU issue

Commit ef6a3c6311 ("mm: add replace_page_cache_page() function") added a
function replace_page_cache_page().  This function replaces a page in the
radix-tree with a new page.  WHen doing this, memory cgroup needs to fix
up the accounting information.  memcg need to check PCG_USED bit etc.

In some(many?) cases, 'newpage' is on LRU before calling
replace_page_cache().  So, memcg's LRU accounting information should be
fixed, too.

This patch adds mem_cgroup_replace_page_cache() and removes the old hooks.
 In that function, old pages will be unaccounted without touching
res_counter and new page will be accounted to the memcg (of old page).
WHen overwriting pc->mem_cgroup of newpage, take zone->lru_lock and avoid
races with LRU handling.

Background:
  replace_page_cache_page() is called by FUSE code in its splice() handling.
  Here, 'newpage' is replacing oldpage but this newpage is not a newly allocated
  page and may be on LRU. LRU mis-accounting will be critical for memory cgroup
  because rmdir() checks the whole LRU is empty and there is no account leak.
  If a page is on the other LRU than it should be, rmdir() will fail.

This bug was added in March 2011, but no bug report yet.  I guess there
are not many people who use memcg and FUSE at the same time with upstream
kernels.

The result of this bug is that admin cannot destroy a memcg because of
account leak.  So, no panic, no deadlock.  And, even if an active cgroup
exist, umount can succseed.  So no problem at shutdown.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Miklos Szeredi <mszeredi@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index f944591..3558a5e 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -122,6 +122,8 @@ struct zone_reclaim_stat*
 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
                                        struct task_struct *p);
+extern void mem_cgroup_replace_page_cache(struct page *oldpage,
+                                       struct page *newpage);
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 extern int do_swap_account;
@@ -369,6 +371,10 @@ static inline
 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 {
 }
+static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
+                               struct page *newpage)
+{
+}
 #endif /* CONFIG_CGROUP_MEM_CONT */
 
 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)

diff --git a/mm/filemap.c b/mm/filemap.c
index c4ee2e9..97f49ed 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -393,24 +393,11 @@ EXPORT_SYMBOL(filemap_write_and_wait_range);
 int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
 {
        int error;
-       struct mem_cgroup *memcg = NULL;
 
        VM_BUG_ON(!PageLocked(old));
        VM_BUG_ON(!PageLocked(new));
        VM_BUG_ON(new->mapping);
 
-       /*
-        * This is not page migration, but prepare_migration and
-        * end_migration does enough work for charge replacement.
-        *
-        * In the longer term we probably want a specialized function
-        * for moving the charge from old to new in a more efficient
-        * manner.
-        */
-       error = mem_cgroup_prepare_migration(old, new, &memcg, gfp_mask);
-       if (error)
-               return error;
-
        error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM);
        if (!error) {
                struct address_space *mapping = old->mapping;
@@ -432,13 +419,12 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
                if (PageSwapBacked(new))
                        __inc_zone_page_state(new, NR_SHMEM);
                spin_unlock_irq(&mapping->tree_lock);
+               /* mem_cgroup codes must not be called under tree_lock */
+               mem_cgroup_replace_page_cache(old, new);
                radix_tree_preload_end();
                if (freepage)
                        freepage(old);
                page_cache_release(old);
-               mem_cgroup_end_migration(memcg, old, new, true);
-       } else {
-               mem_cgroup_end_migration(memcg, old, new, false);
        }
 
        return error;

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d87aa35..0b2d403 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3432,6 +3432,50 @@ void mem_cgroup_end_migration(struct mem_cgroup *memcg,
        cgroup_release_and_wakeup_rmdir(&memcg->css);
 }
 
+/*
+ * At replace page cache, newpage is not under any memcg but it's on
+ * LRU. So, this function doesn't touch res_counter but handles LRU
+ * in correct way. Both pages are locked so we cannot race with uncharge.
+ */
+void mem_cgroup_replace_page_cache(struct page *oldpage,
+                                 struct page *newpage)
+{
+       struct mem_cgroup *memcg;
+       struct page_cgroup *pc;
+       struct zone *zone;
+       enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
+       unsigned long flags;
+
+       if (mem_cgroup_disabled())
+               return;
+
+       pc = lookup_page_cgroup(oldpage);
+       /* fix accounting on old pages */
+       lock_page_cgroup(pc);
+       memcg = pc->mem_cgroup;
+       mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), -1);
+       ClearPageCgroupUsed(pc);
+       unlock_page_cgroup(pc);
+
+       if (PageSwapBacked(oldpage))
+               type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
+
+       zone = page_zone(newpage);
+       pc = lookup_page_cgroup(newpage);
+       /*
+        * Even if newpage->mapping was NULL before starting replacement,
+        * the newpage may be on LRU(or pagevec for LRU) already. We lock
+        * LRU while we overwrite pc->mem_cgroup.
+        */
+       spin_lock_irqsave(&zone->lru_lock, flags);
+       if (PageLRU(newpage))
+               del_page_from_lru_list(zone, newpage, page_lru(newpage));
+       __mem_cgroup_commit_charge(memcg, newpage, 1, pc, type);
+       if (PageLRU(newpage))
+               add_page_to_lru_list(zone, newpage, page_lru(newpage));
+       spin_unlock_irqrestore(&zone->lru_lock, flags);
+}
+
 #ifdef CONFIG_DEBUG_VM
 static struct page_cgroup *lookup_page_cgroup_used(struct page *page)
 {