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I don't know how much useful could be LRU-2 but with WAL we should try
to reuse undirty free buffers first, not dirty ones, just to postpone
writes as long as we can. (BTW, this is what Oracle does.)
-So, we probably should put new free dirty buffer just before first
-undirty one in LRU.
+So, we probably should put new unfree dirty buffer just before first
+dirty one in LRU.
Vadim