shmem: fix negative rss in memcg memory.stat

When adding the page_private checks before calling shmem_replace_page(), I
did realize that there is a further race, but thought it too unlikely to
need a hurried fix.

But independently I've been chasing why a mem cgroup's memory.stat
sometimes shows negative rss after all tasks have gone: I expected it to
be a stats gathering bug, but actually it's shmem swapping's fault.

It's an old surprise, that when you lock_page(lookup_swap_cache(swap)),
the page may have been removed from swapcache before getting the lock; or
it may have been freed and reused and be back in swapcache; and it can
even be using the same swap location as before (page_private same).

The swapoff case is already secure against this (swap cannot be reused
until the whole area has been swapped off, and a new swapped on); and
shmem_getpage_gfp() is protected by shmem_add_to_page_cache()'s check for
the expected radix_tree entry - but a little too late.

By that time, we might have already decided to shmem_replace_page(): I
don't know of a problem from that, but I'd feel more at ease not to do so
spuriously.  And we have already done mem_cgroup_cache_charge(), on
perhaps the wrong mem cgroup: and this charge is not then undone on the
error path, because PageSwapCache ends up preventing that.

It's this last case which causes the occasional negative rss in
memory.stat: the page is charged here as cache, but (sometimes) found to
be anon when eventually it's uncharged - and in between, it's an
undeserved charge on the wrong memcg.

Fix this by adding an earlier check on the radix_tree entry: it's
inelegant to descend the tree twice, but swapping is not the fast path,
and a better solution would need a pair (try+commit) of memcg calls, and a
rework of shmem_replace_page() to keep out of the swapcache.

We can use the added shmem_confirm_swap() function to replace the
find_get_page+page_cache_release we were already doing on the error path.
And add a comment on that -EEXIST: it seems a peculiar errno to be using,
but originates from its use in radix_tree_insert().

[It can be surprising to see positive rss left in a memcg's memory.stat
after all tasks have gone, since it is supposed to count anonymous but not
shmem.  Aside from sharing anon pages via fork with a task in some other
memcg, it often happens after swapping: because a swap page can't be freed
while under writeback, nor while locked.  So it's not an error, and these
residual pages are easily freed once pressure demands.]

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

diff --git a/mm/shmem.c b/mm/shmem.c
index 3f696f7..294364a 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -263,6 +263,24 @@ static int shmem_radix_tree_replace(struct address_space *mapping,
        return 0;
 }
 
+/*
+ * Sometimes, before we decide whether to proceed or to fail, we must check
+ * that an entry was not already brought back from swap by a racing thread.
+ *
+ * Checking page is not enough: by the time a SwapCache page is locked, it
+ * might be reused, and again be SwapCache, using the same swap as before.
+ */
+static bool shmem_confirm_swap(struct address_space *mapping,
+                              pgoff_t index, swp_entry_t swap)
+{
+       void *item;
+
+       rcu_read_lock();
+       item = radix_tree_lookup(&mapping->page_tree, index);
+       rcu_read_unlock();
+       return item == swp_to_radix_entry(swap);
+}
+
 /*
  * Like add_to_page_cache_locked, but error if expected item has gone.
  */
@@ -1124,9 +1142,9 @@ repeat:
                /* We have to do this with page locked to prevent races */
                lock_page(page);
                if (!PageSwapCache(page) || page_private(page) != swap.val ||
-                   page->mapping) {
+                   !shmem_confirm_swap(mapping, index, swap)) {
                        error = -EEXIST;        /* try again */
-                       goto failed;
+                       goto unlock;
                }
                if (!PageUptodate(page)) {
                        error = -EIO;
@@ -1142,9 +1160,12 @@ repeat:
 
                error = mem_cgroup_cache_charge(page, current->mm,
                                                gfp & GFP_RECLAIM_MASK);
-               if (!error)
+               if (!error) {
                        error = shmem_add_to_page_cache(page, mapping, index,
                                                gfp, swp_to_radix_entry(swap));
+                       /* We already confirmed swap, and make no allocation */
+                       VM_BUG_ON(error);
+               }
                if (error)
                        goto failed;
 
@@ -1245,14 +1266,10 @@ decused:
 unacct:
        shmem_unacct_blocks(info->flags, 1);
 failed:
-       if (swap.val && error != -EINVAL) {
-               struct page *test = find_get_page(mapping, index);
-               if (test && !radix_tree_exceptional_entry(test))
-                       page_cache_release(test);
-               /* Have another try if the entry has changed */
-               if (test != swp_to_radix_entry(swap))
-                       error = -EEXIST;
-       }
+       if (swap.val && error != -EINVAL &&
+           !shmem_confirm_swap(mapping, index, swap))
+               error = -EEXIST;
+unlock:
        if (page) {
                unlock_page(page);
                page_cache_release(page);
@@ -1264,7 +1281,7 @@ failed:
                spin_unlock(&info->lock);
                goto repeat;
        }
-       if (error == -EEXIST)
+       if (error == -EEXIST)   /* from above or from radix_tree_insert */
                goto repeat;
        return error;
 }