Physical Address

• directly correspond to physical location in RAM

Virtual Address

• used by OS and applications
• mapped to a physical memory address
• each process can have own virtual address space

Address Mapping Possibilities

• single virtual address (different process) -> different physical address
• multiple virtual addresses -> same physical address

User Space

• private virtual address space
• executable code can be loaded at same virtual address (for different process)
  • refers to different physical memory

System Space

• single virtual address space in kernel mode
• all drivers use the same address space

Paged out

• moving data from RAM to disk
• for freeing RAM space
• paged pool
  • memory pool that can be paged out
• nonpaged pool
  • memory pool that cannot be paged out

Page tables

• maps virtual to physical address