From 8c0a85377048b64c880e76ec7368904fe46d0b94 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Wed, 26 Sep 2012 11:33:07 +1000 Subject: fs: push rcu_barrier() from deactivate_locked_super() to filesystems There's no reason to call rcu_barrier() on every deactivate_locked_super(). We only need to make sure that all delayed rcu free inodes are flushed before we destroy related cache. Removing rcu_barrier() from deactivate_locked_super() affects some fast paths. E.g. on my machine exit_group() of a last process in IPC namespace takes 0.07538s. rcu_barrier() takes 0.05188s of that time. Signed-off-by: Kirill A. Shutemov Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Al Viro --- fs/btrfs/inode.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index ec154f954646..cf03a91d806f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7076,6 +7076,11 @@ static void init_once(void *foo) void btrfs_destroy_cachep(void) { + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); if (btrfs_inode_cachep) kmem_cache_destroy(btrfs_inode_cachep); if (btrfs_trans_handle_cachep) -- cgit v1.2.1