Landley has a good basic description of Linux Virtual Memory Management over here. I got the link via Chris Siebenmann whose blog is another great one which details his experiences in hardware management, ZFS file system, operating systems update, email management and much more.
Landley’s page also has links to further additional topics regarding memory.
In fact, Landley’s website includes a great many writings and is a gold mine of information regarding linux and computer history. The website also includes magazine issues from 1980s, politics in linux environment and much much more.