Memory and Virtual
Memory
This chapter describes allocating memory and
the low-level routines for modifying memory maps in the kernel.
It also describes a number of commonly used interfaces to the virtual
memory system. It does not describe how to make changes in paging
policy or add additional pagers. Mac OS X does not support external
pagers, although
much of the functionality can be achieved in other ways, some of
which are covered at a high level in this chapter. The implementation
details of these interfaces are subject to change, however, and
are thus left undocumented.
With the exception of the section “Allocating Memory in the Kernel”,
this chapter is of interest only if you are writing file systems
or are modifying the virtual memory system itself.
Contents:
Mac OS X VM Overview
Memory Maps Explained
Named Entries
Universal Page Lists (UPLs)
Using Mach Memory Maps
Other VM and VM-Related Subsystems
Address Spaces
Allocating Memory in the Kernel
