Page Sharing

• One copy of read-only (reentrant) code shared among different processes.

• Saves a lot of memory.

Ed 1

Ed 2

Ed 3

Data 1

Process1

logical memory

Ed 2

Data 1

Ed 1

Ed 3

Page Table

1

4

3

7

0

1

2

3

4

5

6

7

Frame

number

Physical

Memory

Ed 1

Ed 2

Ed 3

Data 2

Process2

logical memory

Page Table

1

4

3

0

Ed 1

Ed 2

Ed 3

Data 3

Process3

logical memory

Page Table

1

4

3

9

8

9

Data 2

Data 3

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