CHAPTER9:MEMORYMANAGEMENT(内存管理)BackgroundSwappingContiguousAllocationPagingSegmentationSegmentationwithPaging Background:Memory-ManagementUnit(MMU)Whatisseenisnotalwaystrue.Hardwaredevicethatmapsvirtualtophysical address.InMMUscheme,thevalueintherelocation registerisaddedtoeveryaddressgeneratedbyauserprocessatthetimeit...
Figure 3-6. (a) A part of memory with five processes and three holes. The tick marks show the memory allocation units. The shaded regions (0 in the bitmap) are free. (b) The corresponding bitmap. (c) The same information as a list. Memory Management with Bitmaps Tanenbaum, Modern ...
Memory-ManagementUnit(MMU) Whatisseenisnotalwaystrue. Hardwaredevicethatmapsvirtualtophysicaladdress. InMMUscheme,thevalueintherelocationregisterisaddedtoeveryaddressgeneratedbyauserprocessatthetimeitissenttomemory. Theuserprogramdealswithlogicaladdresses;itneverseestherealphysicaladdresses. ...
operating system《操作系统》ch08-main memory-57-PPT课件 Chapter8:MainMemory ChapterObjectives Toprovideadetaileddescriptionofvariouswaysof organizingmemoryhardware Todiscussvariousmemory-managementtechniques,includingpagingandsegmentation ToprovideadetaileddescriptionoftheIntelPentium,whichsupportsbothpure...
13、addr = physical addr;lneed MMU(Memory-Management Unit)8.15Silberschatz, Galvin and Gagne 2005Operating System Concepts 7th Edition, Feb 22, 2005nMMU: Hardware device that maps virtual to physical addressnExample: dynamic relocation using a relocation registerlthe value in the relocation register...
MemoryManagement.ppt,Chapter 9: Memory Management 内存是计算机系统的最重要的资源之一。 为提高响应速度及CPU的利用率,必须将多个进程同时放入内存,多进程共享内存。 本章介绍内存管理方法。内存管理方法很多,但内容主要涉及下述三个方面: 内存分配回收方法 地址映
Logical (virtual) and physical addresses differ in execution-time address-binding scheme 8.9 Memory-Management Unit (MMU) ? Hardware device that maps virtual to physical address ? In MMU scheme, the value in the relocation register is added to every address generated by a user process at the ...
L14-MemoryManagement OperatingSystemLecture14:MemoryManagement HuYanSchoolofSoftware,DLUT Chapter8:MemoryManagement BackgroundSwappingContiguousMemoryAllocationPagingStructureofthePageTableSegmentationExample:TheIntelPentium OperatingSystem 1.2 ssdut-os@2009 Objectives Toprovideadetailed...
9.3 9.1Background Virtualmemory–separationofuserlogicalmemoryfrom physicalmemory. OnlypartoftheprogramneedstobeinmemoryforexecutionLogicaladdressspacecanthereforebemuchlargerthanphysicaladdressspaceAllowsaddressspacestobesharedbyseveralprocessesAllowsformoreefficientprocesscreation Virtualmemorycanbe...
Memory-ManagementUnit(MMU)HardwaredevicethatmapsvirtualtophysicaladdressInMMUscheme,thevalueintherelocationregisteris addedtoeveryaddressgeneratedbyauserprocessatthetimeitissenttomemoryTheuserprogramdealswithlogicaladdresses;itneverseestherealphysicaladdresses 8.10 Dynamicrelocationusingarelocationregister 8...