1. 21 Jul, 2011 2 commits
    • Dave Chinner's avatar
      inode: remove iprune_sem · 4f8c19fd
      Dave Chinner authored
      Now that we have per-sb shrinkers with a lifecycle that is a subset
      of the superblock lifecycle and can reliably detect a filesystem
      being unmounted, there is not longer any race condition for the
      iprune_sem to protect against. Hence we can remove it.
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      4f8c19fd
    • Dave Chinner's avatar
      superblock: introduce per-sb cache shrinker infrastructure · b0d40c92
      Dave Chinner authored
      With context based shrinkers, we can implement a per-superblock
      shrinker that shrinks the caches attached to the superblock. We
      currently have global shrinkers for the inode and dentry caches that
      split up into per-superblock operations via a coarse proportioning
      method that does not batch very well.  The global shrinkers also
      have a dependency - dentries pin inodes - so we have to be very
      careful about how we register the global shrinkers so that the
      implicit call order is always correct.
      
      With a per-sb shrinker callout, we can encode this dependency
      directly into the per-sb shrinker, hence avoiding the need for
      strictly ordering shrinker registrations. We also have no need for
      any proportioning code for the shrinker subsystem already provides
      this functionality across all shrinkers. Allowing the shrinker to
      operate on a single superblock at a time means that we do less
      superblock list traversals and locking and reclaim should batch more
      effectively. This should result in less CPU overhead for reclaim and
      potentially faster reclaim of items from each filesystem.
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      b0d40c92
  2. 20 Jul, 2011 38 commits