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Serialize rdtsc instruction on x86_64 #2727
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Unfortunately rdtsc can produce skewed results without mfence sometimes. This is what GNU/Linux does in rdtsc_ordered function. ref: https://github.com/torvalds/linux/blob/03b9730b769fc4d87e40f6104f4c5b2e43889f19/arch/x86/include/asm/msr.h#L130-L154
n8sh
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Aug 29, 2019
n8sh
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72h no objection -> merge
thewilsonator
approved these changes
Aug 29, 2019
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Unfortunately rdtsc can produce skewed results without mfence sometimes.
This is what GNU/Linux does in rdtsc_ordered function.