Change Details

Mostly, attempt to catch up to r292373. Please look more closely at the removal of the requirement to call vm_page_xunbusy(9); r292373's diff did not help me very much.

Mostly, attempt to catch up to r292373. Other general tidying while in the area.

Mostly, attempt to catch up to r292373. Please look more closely at the removal of the requirement to call vm_page_xunbusy(9); r292373's diff did not help me very muchOther general tidying while in the area.