[habibur]

This will hardly increase performance if any. Note that OS caches frequently used files in-memory. When you are using this, you are basically competing with the OS for in-memory file cache.

This library might have other uses that I am not aware of.

[fsckboy]

are there embedded systems, including potentially realtime, that are running OSes or on CPUs that don't provide caches or page fault support?

[brandmeyer]

In those cases, the filesystem provides its own block cache.