K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2013-06-11T19:02:10.826696Z
K 7
svn:log
V 548
- Fix a mismerge which happened recently.
- When a page is only read, rather than using indiscriminately page
  holding, soft busy it.
  Page hold mechanism is cheaper than wiring but it is also dangerous in
  a way that it does mostly break LRU. Unless this is absolutely
  necessary, avoid to hold the page.
  This patch clens up page busying for all the page copy cases.
  The only left usage of page holding are vm_fault_hold_pages(),
  vm_fault_hold() (which should be fixed for the proc_rwmem() case too)
  and finally exec_map_first_page().

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