Hi,

This is a embryotic, but with heart beats, patch of page ageing
for test3-pre6.

Features:
* does NOT add any field in page structure.
* round robin lists is used to simulate ageing.
* referenced pages are moved 5 steps forward.
* non freeable, tryagain, are moved 3 steps forward.
* new pages are inserted 2 steps forward.
* no pages are moved backward or to currently scanned.

Future work:
* trim offsets / size / priority
* remove code that unnecessary sets page as referenced (riel?)
* add more offsets depending on why the page could not
  be freed.
* split pagemap_lru_lock (if wanted on SMP)
* move pages of zones with pressure less forward...
* ...

/RogerL

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