Operating System Support for the Heterogeneous OMAP4430.pdf

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1、OperatingSystemSupportfortheHeterogeneousOMAP4430:AtaleoftwomicrosEtienneLeSueurandSimonRodgerswithAaronCarrollandBernardBlackhamLinux.conf.au,Ballarat17January2012Traditionalchip-multi-processors•SymmetricMulti-Processing(SMP)–twoormoreidenticalproc

2、essors/coresCoreCoreMemoryCoreCorefromimaginationtoimpact©NICTA2012Traditionalchip-multi-processors•SymmetricMulti-Processing(SMP)–twoormoreidenticalprocessors/coresCoreCoreCoreCoreMemoryDDRHT/DDRMemoryQPICoreCoreCoreCorefromimaginationtoimpact©NICTA

3、2012Heterogeneouschip-multi-processors•‘AsymmetricMulti-Processing’(AMP)–severaldifferentprocessors/coresCoreCoreMemoryCoreCorefromimaginationtoimpact©NICTA2012CoreasymmetryCoreCoreMemoryCoreCorefromimaginationtoimpact©NICTA2012CoreasymmetryCoreCoreM

4、emoryCoreCorefromimaginationtoimpact©NICTA2012Coreasymmetry•Performance–differentfrequency–differentpipelines–differentsizecaches/TLBs–etc.CoreCoreMemoryCoreCorefromimaginationtoimpact©NICTA2012Coreasymmetry•Performance–differentfrequency–differentpi

5、pelines–differentsizecaches/TLBs–etc.•InstructionSetArchitecture–ARMv7vsThumbCoreCore–SSEvsnoSSEMemoryCoreCorefromimaginationtoimpact©NICTA2012Benefitsofheterogeneoussystems•Energyefficiency–smallcoreshaveasmalldiearea–low-poweroff-loadallowsbigcoresto

6、sleepwhilesmallcoreswork•Computationalefficiencyingeneral–canfitmoresmallcoresinagivenareagivinggreaterparallelperformance–single-threadedworkloadscanstillgetperformanceonabigcorefromimaginationtoimpact©NICTA2012OSdesignforheterogeneousprocessors•Model

7、s–restrictive–hybrid–unified–distributedfromimaginationtoimpact©NICTA2012Restrictivemodel•Restrictallprogramstothesubsetoffeaturessupportedbybothtypesofcores•Limitedtoasubsetoffeatures–performancemaynotbeasgoodasitcouldbefromimaginationtoimpact©NICTA2

8、012Hybridmodel•Allowuserprogramstointerrogatetheheterogenouscapabilitiesofthesystem•Allowsuserprogramstoexecuteonthecoresthatprovidethefeaturestheyneed.–onIntel,CPUID–sched_setaffinity(target_core)fromimaginationtoimpact©NICTA2012Unifiedmodel•Allowprog