Shared Pages

• Shared code

1. One copy of read-only (reentrant) code shared among processes (i.e., text editors, compilers, window systems).
2. Shared code must appear in same location in the logical address space of all processes.

• Private code and data

1. Each process keeps a separate copy of the code and data.
2. The pages for the private code and data can appear anywhere in the logical address space.