hogan scarpe Combined Paging and Segmentation_1163

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Combined Paging and Segmentation
Both paging and segmentation have their strengths. Paging, which is perspicuous to the programmer,[link widoczny dla zalogowanych], eliminates external fragmentation and accordingly provides effective use of main memories. Pieces that are shook in and out of main memories are of nailed equal size,[link widoczny dla zalogowanych], it is feasible to amplify sophisticated memory-management algorithms that exploit the behavior of programs.
Segmentation is apparent to the programmer and has the competence to knob growing file structures,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych], modularity, and aid for sharing and protection. To combine the conveniences of both, some systems are equipped with processor hardware and operating system software to invest both.
In a combined paging/segmentation system a consumer address space is broken up into a number of segments at the discretion of the programmer. Each segment is in turn broken up into a number of fixed-size pages which are equal in length to a main memory frame. If a segment is less than a page in length, the segment occupies equitable one page. From the programmer`s point of outlook, a plausible address still consists of a segment number and a segment offset. From the system`s point of view, the segment offset is viewed as a page number and page offset for a page within the specified segment.
Associated with each process are segment tables and number of page tables, 1 per process segment. When a particular process is scampering,[link widoczny dla zalogowanych], a enroll holds the beginning residence of the segment table for that process. Presented with a virtual address, the processor uses the segment number portion to index into the process segment table to find the page table for that segment. Then,[link widoczny dla zalogowanych], the page number portion of the virtual address is used to concordance the page table and look up the corresponding frame number. This combined with the offset portion of the virtual address to produce the desired real address.
The segment chart entry contains the width of the section. It also contains a base field,[link widoczny dla zalogowanych], which now refers to a sheet table. The present and modified bits are not needed because these materials are handled by the sheet class. Other control bits may be accustomed because intentions of sharing and protection. The sheet table portal namely essentially the same for that accustom in a pure paging system. Each page digit namely charted onto a corresponding skeleton number whether the page is present in main memory.
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It indicates page delivery. Combined paging and segmentation is widely used.

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