By Bill Blunden

Reminiscence administration: Algorithms and Implementation in C/C++ provides numerous concrete implementations of rubbish assortment and particular reminiscence administration algorithms. each implementation is complemented by way of an in-depth presentation of thought, via benchmark exams, an entire directory of C/C++ resource code, and a dialogue of every implementation's trade-offs.With this e-book, you can:Find out how reminiscence is controlled on the point by means of the processor.Discover the ways that diversified working structures make the most of processor amenities to supply reminiscence companies through the process name interface.Understand how improvement libraries and run-time platforms construct upon the working procedure prone to control reminiscence on behalf of person applications.Learn approximately 5 entire reminiscence administration subsystems that make the most of either particular and automated assortment algorithms.

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In addition to keeping track of individual pages, most operating systems also monitor page frame usage. The number of page frames is usually much smaller than the number of pages, so it is in the best interest of the operating system to carefully manage this precious commodity. NOTE It is possible to use paging without using disk space. But in this case, paging transforms into a hybrid form of segmentation that deals with 4KB regions of memory. Because Intel’s Pentium class of processors is easily accessible, I decided to use the Pentium to help illustrate segmentation and paging.

15, you will see that CR3 plays a vital role in the address resolution process. If CR3 is corrupt, you can kiss your memory manager goodbye. The other two flags (PCD and PWT) in this register are related to caching and are not directly relevant to the immediate discussion. The CR4 register is used to enable a couple of advanced mechanisms. For example, the PAE flag enables four extra address lines when it is set. This would bring the number of address lines to 36. Note that the PG flag must be set in CR0 in order for PAE to be effective.

Typically, the operating system code segments will execute with the highest privilege and applications will be loaded into segments with less authority. 5 Paging is a way to implement virtual memory. The physical memory provided by DRAM and disk storage, which is allocated to simulate DRAM, are merged together into one big amorphous collection of bytes. The total number of bytes that a processor is capable of addressing, if paging is enabled, is known as its virtual address space. 11 Chapter 1 Memory Management Mechanisms 12 Chapter 1 The catch to all this is that the address of a byte in this artificial/virtual address space is no longer the same as the address that the processor places on the address bus.

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