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Memory

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Muhammed Mazhar Khan
Muhammed Mazhar Khan
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Memory Management in Linux Anand Sivasubramaniam
Two Parts ,[object Object],[object Object],[object Object]
Architecture Independent Memory Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],Index into Page Dir. Index into Page Middle Dir. Index into Page Table Page Offset
Page Dir. And Middle Dir. Access Functions (in asm/page.h and asm/pgtable.h ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Page Table Entry ( pte_t ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Page Table Functions ,[object Object],[object Object],[object Object],[object Object],[object Object]
Process Address Space (not to scale!) Kernel 0xC0000000 File name, Environment Arguments Stack bss _end _bss_start Data _edata _etext Code Header 0x84000000 Shared Libs
Address Space Descriptor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Region Descriptors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Traditional mmap() ,[object Object],[object Object],[object Object],[object Object],[object Object]
How is brk() implemented? ,[object Object],[object Object],[object Object]
Kernel Segment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Memory Allocn for Kernel Segment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
kmalloc() data structures sizes[] bh bh bh bh bh bh Null Null page_descriptor size_descriptor 32 64 128 252 508 1020 2040 4080 8176 16368 32752 65520 131056
vmalloc() ,[object Object],[object Object],[object Object],[object Object],[object Object],addr size next addr size next vmlist vmstruct VAS
vmalloc vs kmalloc ,[object Object],[object Object],[object Object],[object Object]
Paging ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Finding a Physical Page ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],free_area_list[0 1 2] free_area_map 0 1 2
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
Page Fault ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Memory

  • 1. Memory Management in Linux Anand Sivasubramaniam
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9. Process Address Space (not to scale!) Kernel 0xC0000000 File name, Environment Arguments Stack bss _end _bss_start Data _edata _etext Code Header 0x84000000 Shared Libs
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18. kmalloc() data structures sizes[] bh bh bh bh bh bh Null Null page_descriptor size_descriptor 32 64 128 252 508 1020 2040 4080 8176 16368 32752 65520 131056
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29.
  • 30.