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1、AbstractAsanimportantfeatureofvirtualization,checkpointingcansavethewholeexecutionenvironmentsstatusoftherunningvirtualmachine(VM)forlaterrestorationandensurethattheVMcontinuestorunaftercompletion.Itprovidesgreatbenefitsforsystemmaintenance,fault-tolerant,
2、testinganddebugginginmodemclustersanddatacenters.However,thesystem-levelcheckpointingneedstosavealargenumberofdatatothedisk.Moreover,theoverheadgrowslinearlywiththeincreasingsizeofvirtualmachinememory,whichleadstodiskI/Oconsumptiondisasteralongwithpoorsyst
3、emscalability.Totargetthis,anovelfastVMscheckpointingapproachisproposed.Bystudyingtherun-timememorycharacteristicsofdifferentworkloads,theapproachcountsthedirtypagesinafine-granularitymanner(thenumberof8bytes),insteadoftheconventionalmethod(thenumberofpage
4、s);theapproachutilizesdirtypageloggingmechanismtorecordthedirtypagesanddirtybitmaptomarkthem;accordingly,adeltamemorycompressionmechanismisimplementedtoeliminateredundantmemorydataincheckpointingfiles.Tolocatethedirtydataindirtypages,theapproachutilizestwo
5、mechanisms:byanalyzingthedistributioncharacteristicsofdirtypagesindirtybitmap,afastdirtybitmapscanningmethodisproposedtolocatethedirtypages,andtakeamulti-threadingdatacomparisonmechanismtolocatetherealdirtydatainonepage.Theexperimentalresultsshowthatcompar
6、edwithXen'sdefaultsystem-levelcheckpointingalgorithm,theapproachcanreduce70.54%ofcheckpointingtimeonaveragewith1GBmemorysizeandachievebetterimprovementforVMswithlargermemoryconfigurations;theapproachcanreduce52.88%ofthecheckpointingdatasizeonaveragecompare
7、dwithRemus'sincrementalsolutionwhichisinpagegranularity.ComparedwithdefaultdirtybitmapscanningmethodinXen,thescanningtimeoftheapproachisdecreasedby91.13%onaverage.Keywords:VirtualMachine,MemoryCompression,DirtyBitmap,Checkpoint目录摘要IAbstractII1绪论1.1问题的提出(1)
8、1.2国内外研究现状(3)1.3课题背景与研究内容(9)1.4文章框架结构(12)2虚拟机检查点优化机制的分析与系统设计2.1全系统检查点的内容和流程分析(13)2.2全系统检查点存在的关键问题分析(15)2.3设计思想(20)2.4系统架构与处理流程(21)2.5小结(22)3虚拟机检查点优化机制的关键实现技术3.1脏页记录机制(24)3.2Delta内存压缩(26)3.3快速脏页过滤(29)3.4小结(35)
