I love articles like this. I always learn something new. I must admit that I did think that malloc would use VM if necessary hence giving a potentially "unlimited" address space, but I guess it is nice to have that cemented rather than theorized. Can we ever really count on memory being allocated to RAM? I think not (it's against the kernel/user buffer right?), but it's good to know these things.

Of course: I attempt to always be in a learning phase so if anyone can expand (or elaborate) then I'd appreciate it :)