tree 794035de0243b20cda0fdf571e2ed02f29aa962e
parent 65b51a009e29e64c0951f21ea17fdc66bbb0fbd7
author Chris Mason <chris.mason@oracle.com> 1217852415 -0400
committer Chris Mason <chris.mason@oracle.com> 1222355046 -0400

Btrfs: More throttle tuning

* Make walk_down_tree wake up throttled tasks more often
* Make walk_down_tree call cond_resched during long loops
* As the size of the ref cache grows, wait longer in throttle
* Get rid of the reada code in walk_down_tree, the leaves don't get
  read anymore, thanks to the ref cache.

Signed-off-by: Chris Mason <chris.mason@oracle.com>