K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2013-06-23T22:27:57.521194Z
K 7
svn:log
V 656
- Introduce the read/write busy concept switching the KPI on a real
  rwlock-style lock.
- Add accessor KPI to cope with this change.
- The KPI relies on the object lock to be held still in write mode
  for all the places assuming the busy lock state won't change.
- The KPI is not yet inlined because of the assert dependency on
  vm_object operations.  When it will be implemented via atomics such
  dependency will go and we will use inline macros.
- Remove vm_page_wakeup_locked() because in the future once the
  atomics approach is implemented the concurrency on the page lock
  will be possibly minimal.

Sponsored by:	EMC / Isilon storage division

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