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Lecture22nFull - COT 4600 Operating Systems Spring 2011...

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Click to edit Master subtitle style 8/1/11 Lecture 22 COT 4600 Operating Systems Spring 2011 Dan C. Marinescu Office: HEC 304 Office hours: Tu-Th 5:00-6:00 PM
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Lecture 22 8/1/11 Lecture 22 - Tuesday April 12, 2011 n Last time: ¨ Scheduling n Today: ¨ Memory characterization ¨ Multilevel memories management using virtual memory ¨ Adding multi-level memory management to virtual memory ¨ Page replacement algorithms n Next Time: ¨ Performance 22
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Lecture 22 8/1/11 Virtual memory n Several strategies ¨ Paging ¨ Segmentation ¨ Paging+ segmentation n At the time a process/thread is created the system creates a page table for it; an entry in the page table contains ¨ The location in the swap area of the page ¨ The address in main memory where the page resides if the page has been brought in from the disk ¨ Other information e.g. dirty bit. n Page fault ° a process/thread references an address in a page which is not in main memory n On demand paging ° a page is brought in the main memory from the swap area on the disk when the process/thread references an address in that page. 33
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Lecture 22 8/1/11 44
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Lecture 22 8/1/11 55
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Lecture 22 8/1/11 Dynamic address translation 66
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Lecture 22 8/1/11 Multi-level memories 77
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Lecture 22 8/1/11 System components involved in memory management n Virtual memory manager – VMM ° dynamic address translation n Multi level memory management – MLMM ° 88
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Lecture 22 8/1/11
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