Pageable code structure

To minimize the code working set of a program, the general objective is to pack code that is frequently executed into a small area, separating it from infrequently executed code.

Specifically:

• Do not put long blocks of error-handling code in line. Place them in separate subroutines, preferably in separate source-code modules. This applies not only to error paths, but to any functional option that is infrequently used.
• Do not structure load modules arbitrarily. Try to ensure that frequently called object modules are located as close to their callers as possible. Object modules consisting (ideally) of infrequently called subroutines should be concentrated at the end of the load module. The pages they inhabit will seldom be read in.