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| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2012-09-26 11:33:07 +1000 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2012-10-02 21:35:55 -0400 |
| commit | 8c0a85377048b64c880e76ec7368904fe46d0b94 (patch) | |
| tree | 12e075f4159e88b09a89e35866017f82f80bcc7d /fs/super.c | |
| parent | btrfs: reada_extent doesn't need kref for refcount (diff) | |
| download | linux-dev-8c0a85377048b64c880e76ec7368904fe46d0b94.tar.xz linux-dev-8c0a85377048b64c880e76ec7368904fe46d0b94.zip | |
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 <kirill.shutemov@linux.intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
| -rw-r--r-- | fs/super.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/fs/super.c b/fs/super.c index 0902cfa6a12e..5fdf7ff32c4e 100644 --- a/fs/super.c +++ b/fs/super.c @@ -307,12 +307,6 @@ void deactivate_locked_super(struct super_block *s) /* caches are now gone, we can safely kill the shrinker now */ unregister_shrinker(&s->s_shrink); - - /* - * We need to call rcu_barrier so all the delayed rcu free - * inodes are flushed before we release the fs module. - */ - rcu_barrier(); put_filesystem(fs); put_super(s); } else { |