Clock with Adaptive Replacement

Hi hackers,

What do you think about improving cache replacement clock-sweep algorithm in PostgreSQL with adaptive version proposed in this article:

http://www-cs.stanford.edu/~sbansal/pubs/fast04.pdf

Are there some well known drawbacks of this approach or it will be interesting to adopt this algorithm to PostgreSQL and measure it impact om performance under different workloads?
I find this ten years old thread:

http://www.postgresql.org/message-id/flat/d2jkde$6bg$1(at)sea(dot)gmane(dot)org#d2jkde$6bg$1@sea.gmane.org

but it mostly discus possible patent issues with another algorithm ARC (CAR is inspired by ARC, but it is different algorithm).
As far as I know there are several problems with current clock-sweep algorithm in PostgreSQL, especially for very large caches.
May be CAR can address some of them?

--
Konstantin Knizhnik
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company