多媒体及game为目前PC的core

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1、TheLinux-SRTIntegratedMultimediaOperatingSystem:BringingQoSToTheDesktopSpeaker:Yan-PaiChenStephenChildsandDavidIngramUniversityofCambridgeOutlineIntroductionBackgroundSchedulerImplementationEvaluationConclusionIntroductionSoftreal-time(SRT)requirementforapplicationsonth

2、ePCDrawbackofexistingtime-sharingdesigns–can’tpredictablyprovideaspecificproportionofsystemresourcesCPUschedulingaloneisn’tenough–contentionforaccesstootherresourcecanrenderCPUreservationworthlessIntroductionMainideaCloseintegrationbetweensystemcomponentsisnecessarySched

3、ulingpoliciesshouldberespectedthroughoutthesystemBackgroundStandardLinuxschedulingCPUschedulingDynamicStaticDiskschedulingProvidenowayforuserstoinfluencethepriorityofdiskrequestsSchedulerImplementationLinux-SRTfeaturesStandardLinuxFortime-sharingprocesses:SCHED_OTHERForR

4、Tprocesses:SCHED_RR,SCHED_FIFOLinux-SRTaddsSCHED_QOSSCHED_PAUSESCHED_IDLESchedulerImplementationReserve–theunitofresourceallocation,andencapsulatesschedulingparametersSchedulerImplementationCPUschedulingPrecedenceSCHED_QOS>SCHED_RR>SCHED_FIFO>SCHED_OTHER>SCHED_IDLE>SCHED

5、_PAUSEFallbackpolicy–whenatask’sresourceusageexceedsitslimit,itisscheduledaccordingtoafallbackpolicySampleschedulingpoliciesSchedulerImplementationDiskschedulingThesameastheCPUschedulingDiskrequestsaretaggedwithPIDsMultipledevicesupportEachscheduleddevicehasitsownlistofr

6、eservesSchedulersofdevicesareresponsiblefortheirownaccounting,schedulingandpolicingEvaluationCPUschedulereffectivenessEvaluationDiskschedulereffectivenessConclusionExistingapplicationscanbenefitfromQoSwithoutbeingmodifiedSupportQoSformultipledevicesFutureworkAdaptivelySu

7、pportmulti-processorsystemandnetworkdevices