Per-bdi writeback flusher threads v9

Hi,

Here's the 9th version of the writeback patches. Changes since v8:

- Fix a bdi_work on-stack allocation hang. I hope this fixes Ted's
  issue.
- Get rid of the explicit wait queues, we can just use wake_up_process()
  since it's just for that one task.
- Add separate "sync_supers" thread that makes sure that the dirty
  super blocks get written. We cannot safely do this from bdi_forker_task(),
  as that risks deadlocking on ->s_umount. Artem, I implemented this
  by doing the wake ups from a timer so that it would be easier for you
  to just deactivate the timer when there are no super blocks.

For ease of patching, I've put the full diff here:

  http://kernel.dk/writeback-v9.patch

and also stored this in a writeback-v9 branch that will not change,
you can pull that into Linus tree from here:

  git://git.kernel.dk/linux-2.6-block.git writeback-v9

 block/blk-core.c            |    1 +
 drivers/block/aoe/aoeblk.c  |    1 +
 drivers/char/mem.c          |    1 +
 fs/btrfs/disk-io.c          |   24 +-
 fs/buffer.c                 |    2 +-
 fs/char_dev.c               |    1 +
 fs/configfs/inode.c         |    1 +
 fs/fs-writeback.c           |  804 ++++++++++++++++++++++++++++-------
 fs/fuse/inode.c             |    1 +
 fs/hugetlbfs/inode.c        |    1 +
 fs/nfs/client.c             |    1 +
 fs/ntfs/super.c             |   33 +--
 fs/ocfs2/dlm/dlmfs.c        |    1 +
 fs/ramfs/inode.c            |    1 +
 fs/super.c                  |    3 -
 fs/sync.c                   |    2 +-
 fs/sysfs/inode.c            |    1 +
 fs/ubifs/super.c            |    1 +
 include/linux/backing-dev.h |   73 ++++-
 include/linux/fs.h          |   11 +-
 include/linux/writeback.h   |   15 +-
 kernel/cgroup.c             |    1 +
 mm/Makefile                 |    2 +-
 mm/backing-dev.c            |  518 ++++++++++++++++++++++-
 mm/page-writeback.c         |  151 +------
 mm/pdflush.c                |  269 ------------
 mm/swap_state.c             |    1 +
 mm/vmscan.c                 |    2 +-
 28 files changed, 1286 insertions(+), 637 deletions(-)

-- 
Jens Axboe


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