K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2013-06-25T22:46:52.313298Z
K 7
svn:log
V 351
Reimplement the busy mechanism by using atomics and not depending by
object lock for the operation themselves.
This way the busy can be performed also within a path where the obj
is locked in read way.

vm_page_sleep() is renamed into vm_page_busy_sleep() in order to show it
is a busy specific operation.

Sponsored by:	EMC / Isilon storage division

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