Add:

>
> * Consider adding buffers the BGW finds reusable to the free list
>
>   http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php
>
> * Automatically tune bgwriter_delay based on activity rather then using a
>   fixed interval
>
>   http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php