Documentation/mm/active_mm.rst

30   - we have "real address spaces" and "anonymous address spaces". The
31     difference is that an anonymous address space doesn't care about the
33     anonymous address space we just leave the previous address space
36     The obvious use for a "anonymous address space" is any thread that
44   - "tsk->mm" points to the "real address space". For an anonymous process,
45     tsk->mm will be NULL, for the logical reason that an anonymous process
49     "stole" for such an anonymous user. For that, we have "tsk->active_mm",
56     For a anonymous process, tsk->mm == NULL, and tsk->active_mm is the
57     "borrowed" mm while the anonymous process is running. When the
58     anonymous process gets scheduled away, the borrowed address space is
63  and a "mm_count" counter that is the number of "lazy" users (ie anonymous