What are some reasons to allow two or more processes to all have access to a particular region of memory?
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20/09/2022
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8.1 Background
8.2 Swapping
Figure 8.5 - Swapping of two processes using a disk as a backing store
8.3 Contiguous Memory Allocation
8.4 Segmentation
8.5 Paging
8.5.1 Basic Method
Figure 8.10 - Paging hardware Figure 8.11 - Paging model of logical and physical memory
8.6 Structure of the Page Table
8.7 Example: Intel 32 and 64-bit Architectures ( Optional )
Figure 8.21 - Logical to physical address translation in IA-32
8.8 Example: ARM Architecture ( Optional )Figure 8.26 - Logical address translation in ARM.
8.8 Summary
What is the fundamental reason that the OS needs to enforce memory protection?The main purpose of memory protection is to prevent a process from accessing memory that has not been allocated to it. This prevents a bug or malware within a process from affecting other processes, or the operating system itself.
What happens when two applications try to use the same block of memory at the same time?Race conditions are most commonly associated with computer science and programming. They occur when two computer program processes, or threads, attempt to access the same resource at the same time and cause problems in the system.
How does an operating system keep a process from accessing another process's memory space?How does my computer keep processes from stepping on each other? The kernel's scheduler takes care of dividing processes in time. Your operating system also has to divide them in space, so that processes can't step on each others' working memory.
How are processes loaded into memory?For a program to execute as a process, it has to be loaded into memory via a program loader. The executable file that contains the program consists of several sections that identify different regions of the program and where they should be loaded into memory.
What requirements is memory management intended to satisfy?Requirements of Memory Management System.. Memory Allocation Techniques | Mapping Virtual Addresses to Physical Addresses.. Page Table Entries in Page Table.. Virtual Memory in Operating System.. Virtual Memory | Questions.. Fixed (or static) Partitioning in Operating System.. Variable (or dynamic) Partitioning in Operating System.. What are the advantages of using unequal size partitions?In a fixed-partitioning scheme, what are the advantages of using unequal-size partitions? By using unequal-size fixed partitions: 1. It is possible to provide one or two quite large partitions and still have a large number of partitions. The large partitions can allow the entire loading of large programs.
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