Pre-page write additions.

doc/TODO

 TODO list for PostgreSQL
 ========================
-Last updated:		Sat Dec 15 12:28:47 EST 2001
+Last updated:		Thu Dec 20 17:01:06 EST 2001
 
 Current maintainer:	Bruce Momjian (pgman@candle.pha.pa.us)
 
@@ -376,7 +376,10 @@ MISCELLANEOUS
 * Allow logging of query durations
 * Add hash for evaluating GROUP BY aggregates
 * -Read pg_hba.conf only on postmaster startup or SIGHUP (Bruce)
-* Make secondary WAL page write()'s write only modified data to kernel
+* Have pre-page WAL write()'s write only modified data to kernel
+* Reduce number of pre-page WAL writes; they exist only to gaurd against
+  partial page writes
+* Turn off pre-page writes if fsync is disabled (?)
 * -Improve spinlock code [performance] (Tom)
 * Do listen() in postmaster and accept() in pre-forked backend
 * Have pre-forked backend pre-connect to last requested database or pass