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IO Management

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J.T.A.JONES

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I/O Management
Differences in I/O Devices ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Performing I/O ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Performing I/O ,[object Object],[object Object],[object Object]
DMA Configurations
DMA Configurations
Techniques for Performing I/O Programmed I/O Interrupt-driven I/O I/O-to-memory transfer through processor DMA Direct I/O-to-memory transfer No Interrupts Use of Interrupts
Operating System Design Issues ,[object Object],[object Object],[object Object],[object Object],[object Object]
Operating System Design Issues ,[object Object],[object Object],[object Object]
I/O Buffering ,[object Object],[object Object],[object Object],Chap … Addressing space of a process ... fgets(F,s1) fgets(F,s2) ... s1 z  I/O device ……… s2 Chap 11 Input / Output … …
How I/O Buffer works, 1 ……… Addressing space of a process ... fgets(F,s1) fgets(F,s2) ... s1 z  I/O device ……… s2 To avoid these overheads and inefficiencies, it is sometimes convenient to perform input transfers in advance of requests being made and to perform output transfers sometime after the request is made. This technique is known as buffering. Cha … … … … … … … I/O buffer ,[object Object],[object Object],Chap 11 Input / Output … …
How I/O Buffer works, 2 Chap 11 Addressing space of a process ... fgets(F,s1) fgets(F,s2) ... s1  I/O device ……… s2 When the process requests the first line, it is blocked. A few lines will be read, in advance, from the I/O device to the I/O buffer. Later, when the process requests the second line, the OS can satisfy the request from the I/O buffer without blocking. Chap 11 Input / Output … … … Input/Output I/O buffer Chap 11 Input / Output … …
I/O Buffering
Double Buffer ,[object Object],[object Object]
Circular Buffer ,[object Object],[object Object],[object Object]

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IO Management

  • 2.
  • 3.
  • 4.
  • 5.
  • 8. Techniques for Performing I/O Programmed I/O Interrupt-driven I/O I/O-to-memory transfer through processor DMA Direct I/O-to-memory transfer No Interrupts Use of Interrupts
  • 9.
  • 10.
  • 11.
  • 12.
  • 13. How I/O Buffer works, 2 Chap 11 Addressing space of a process ... fgets(F,s1) fgets(F,s2) ... s1  I/O device ……… s2 When the process requests the first line, it is blocked. A few lines will be read, in advance, from the I/O device to the I/O buffer. Later, when the process requests the second line, the OS can satisfy the request from the I/O buffer without blocking. Chap 11 Input / Output … … … Input/Output I/O buffer Chap 11 Input / Output … …
  • 15.
  • 16.