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| author | Vladimir Davydov <vdavydov@virtuozzo.com> | 2016-08-02 23:03:01 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-02 23:31:41 +0200 |
| commit | 05eb6e7263185a6bb0de9501ccf2addc52429414 (patch) | |
| tree | 5f2df8d8db78523351abf46c7f97e9be332788f7 /fs/inode.c | |
| parent | kasan: avoid overflowing quarantine size on low memory systems (diff) | |
| download | linux-05eb6e7263185a6bb0de9501ccf2addc52429414.tar.xz linux-05eb6e7263185a6bb0de9501ccf2addc52429414.zip | |
radix-tree: account nodes to memcg only if explicitly requested
Radix trees may be used not only for storing page cache pages, so
unconditionally accounting radix tree nodes to the current memory cgroup
is bad: if a radix tree node is used for storing data shared among
different cgroups we risk pinning dead memory cgroups forever.
So let's only account radix tree nodes if it was explicitly requested by
passing __GFP_ACCOUNT to INIT_RADIX_TREE. Currently, we only want to
account page cache entries, so mark mapping->page_tree so.
Fixes: 58e698af4c63 ("radix-tree: account radix_tree_node to memory cgroup")
Link: http://lkml.kernel.org/r/1470057188-7864-1-git-send-email-vdavydov@virtuozzo.com
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org> [4.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/inode.c')
| -rw-r--r-- | fs/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/inode.c b/fs/inode.c index 9cef4e16aeda..ad445542c285 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -345,7 +345,7 @@ EXPORT_SYMBOL(inc_nlink); void address_space_init_once(struct address_space *mapping) { memset(mapping, 0, sizeof(*mapping)); - INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC); + INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC | __GFP_ACCOUNT); spin_lock_init(&mapping->tree_lock); init_rwsem(&mapping->i_mmap_rwsem); INIT_LIST_HEAD(&mapping->private_list); |