Description of problem:

The dlm recovery code calls schedule() in a lot of lock loops
to prevent:

1) the softlock watchdog from going off
2) openais cluster membership messages for being delayed past
   the configured timeout

We want to investigate:

- will cond_resched() work as well, and more efficiently than schedule()?
  (I expect so)
- exactly what loops are taking so long (watchdog is 10 sec) and why?
  are there really that many locks and/or are we doing that much work
  on each one that it can take 10 sec?
- why does this seem to appear on ia64 regularly and other arch's rarely?

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