Linux memory

KernelTrap High Memory

LinuxMM HighMemory

Linux Memory

Process Memory

HighMem

• ZONE_HIGHMEM - dynamically mapped pages/processes > 896MB
  

LowMem

• ZONE_NORMAL - normal addressable pages 16-896MB
  
• ZONE_DMA - DMA-able pages <>

Process memory

Stack segment

• Parameters
  
• Return address
• Return frame pointer
  
• Local variables

Heap segment - dynamic memory allocation

Data segment

• BSS - uninitialized global data structures
  
• Data - initialized global variables and data structures

Text/code segment

All threads within a process share code and data segment.
All threads have their own stack.