- Don't defeat the FIFO nature of the buffer cache by eliminating the

   most recently used buffer when we are under paging pressure.  This is
   a perversion of the buffer and page replacement algorithms and recent
   improvements to the page daemon have rendered it unnecessary.  In the
   event that low-memory deadlocks become an issue it would be possible
   to make a daemon or event handler that performs a similar action on
   the oldest buffers rather than the newest.  Since the buf cache
   is analogous to the page cache and some minimum working set is desired
   another possibility is to simply shrink the minimum working set which
   has less downside now that file pages are not directly mapped.

Sponsored by:	EMC / Isilon
Reviewed by:	alc, kib (with some minor objection)
Tested by:	pho

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