Operating systems Memory Management with Linked Lists Before x terminates After X terminates (a) B becomes A M B bax a becomes AB多 (b×B becomes (x1 becomes 多 Four neighbor combinations for the terminating process x Gao Haichang, Software School, Xidian University 18
Operating Systems Gao Haichang , Software School, Xidian University 18 Memory Management with Linked Lists Four neighbor combinations for the terminating process X
Operating systems Memory management with Linked Lists G Several algorithms can be used to allocate memory for a newly created process. 口 First fit 口 Next fit 口 Best fit t Worst fit A Quick fit Gao Haichang, Software School, Xidian University 19
Operating Systems Gao Haichang , Software School, Xidian University 19 Memory Management with Linked Lists Several algorithms can be used to allocate memory for a newly created process: First fit. Next fit. Best fit. Worst fit. Quick fit
Operating Systems Lesson 2
Operating Systems Lesson 2
Operating Systems Chapter 4: Memory Management E 4.1 Basic memory management 4.2 Swapping(交换) 43 irtual memory(虚拟内存) H 4.4 Page replacement algorithms H 4.5 Design issues for paging systems E 4.6 Implementation issues 47 Segmentation(分段) Gao Haichang, Software School, Xidian University
Operating Systems Gao Haichang , Software School, Xidian University 21 Chapter 4: Memory Management 4.1 Basic memory management 4.2 Swapping (交换） 4.3 Virtual memory （虚拟内存） 4.4 Page replacement algorithms 4.5 Design issues for paging systems 4.6 Implementation issues 4.7 Segmentation （分段）
Operating Systems Virtual memory g The basic idea behind virtual memory is that the combined size of the program, data, and stack may exceed the amount of physical memory available for it. The operating system keeps those parts of the program currently in use in main memory, and the rest on the disk. Gao Haichang, Software School, Xidian University 22
Operating Systems Gao Haichang , Software School, Xidian University 22 Virtual Memory The basic idea behind virtual memory is that the combined size of the program, data, and stack may exceed the amount of physical memory available for it. The operating system keeps those parts of the program currently in use in main memory, and the rest on the disk