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cntfrq_el0精度问题 #14

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@peyer

咨询一下,cntfrq_el0的精度是不是达不到cycle的级别,想要达到cycle的级别还得用PMCCNTR_EL0
但是PMCCNTR_EL0需要root权限才行是吧?好像需要先在内核态使能才行

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