ch12 review silberschatz operating system concepts essentials 2nd ed

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Review Questions
Section 12.1
12.1 What are the two conflicting trends of I/O devices? Increased standardization of software and hardware interfaces, and an increasingly broad variety of I/O devices
Section 12.2
12.2 What is a controller? A collection of electronics that can operate a port, a bus, or a device
12.3 True or False? Most CPUs allow some interrupts to be ignored so that a critical instruction cannot be interrupted. True
Section 12.3
12.4 True or False?A given device may require different drivers for different operating systems. true
12.5 What is an alternative to a nonblocking system call? Asynchronous system call
Section 12.4
12.6 List at least three different services provided by the kernel I/O subsystem. Scheduling, Buffering, Caching, Spooling, Device Reservation, and Error Handling
Section 12.5
12.7 True or False? The lifecycle of an I/O request does not require many CPU cycles. False
Section 12.6
12.8 What operating systemis the STREAMS mechanism designed for? Unix System V
Section 12.7
12.9 True or False? I/O operations do not have a signi?cant impact on performance. False

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ch11 review silberschatz operating systems concepts essentials 2nd ed

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Review Questions Section 11.1 11.1 True or False? Disk blocks are made up of one or more sectors. True 11.2 What is the name of the standard Linux file system? Extended file system (ext3/ext4) 11.3 What is the UNIX term for a file control block? inode Section 11.2 11.4 True or False? UNIX treats a directory exactly the same as a file. True 11.5 What does the acronym VFS refer to? Virtual File system Section 11.3 11.6 What are the two general approaches for implementing a directory? Linear list list of file names with pointers to the data blocks, hash table linear list stores directory entries but a hash data structure is used greatly reducing directory search time Section 11.4 11.7 Provide at least two different approaches for allocating disk blocks to files. contiguous allocation, linked allocation, indexed allocation 11.8 True or False? The UNIX inode is an example of linked allocation. False the unix inode is an example of indexed allocation Section 11.5 11.9 What would the...
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