By Abraham Silberschatz, Peter B. Galvin, Greg Gagne
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With this scheme you simply put the names of the remaining ten users in the access control list but with no access privileges allowed. 13 Researchers have suggested that, instead of having an access list associated with each file (specifying which users can access the file, and how), we should have a user control list associated with each user (specifying which files a user can access, and how). Discuss the relative merits of these two schemes. Answer: File control list. Since the access control information is concentrated in one single place, it is easier to change access control information and this requires less space.
Protection not necessary, set system key to 0. b. Set system key to 0 when in supervisor mode. c. Region sizes must be fixed in increments of 2k bytes, allocate key with memory blocks. d. Same as above. e. Frame sizes must be in increments of 2k bytes, allocate key with pages. f. Segment sizes must be in increments of 2k bytes, allocate key with segments. Chapter 10 VIRTUAL MEMORY Virtual memory can be a very interesting subject since it has so many different aspects: page faults, managing the backing store, page replacement, frame allocation, thrashing, page size.
It takes 8 milliseconds to service a page fault if an empty page is available or the replaced page is not modified, and 20 milliseconds if the replaced page is modified. Memory access time is 100 nanoseconds. Assume that the page to be replaced is modified 70 percent of the time. What is the maximum acceptable page-fault rate for an effective access time of no more than 200 nanoseconds? 6 Consider the following page-replacement algorithms. Rank these algorithms on a fivepoint scale from “bad” to “perfect” according to their page-fault rate.
Instructor's Manual for Operating System Concepts by Abraham Silberschatz, Peter B. Galvin, Greg Gagne
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