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Use an isb as a pause instruction on arm64 platforms. #441

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Use an isb as a pause instruction on arm64 platforms. #441

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Commits on Jun 2, 2022

  1. Use an isb as a pause instruction on arm64 platforms. 

    In other projects spinlock implementations and focused testing we've
found that an isb pauses execution for about the same time as an x86
pause instruction. The yield instruction behaves as a nop and thus
doesn't pause the CPU at all which leads to both more contention on the
lock that is being spun on and also a much lower spin-time vs. x86 for
the same spin loop constants. Given this is userspace code, using a wfe
isn't advisable.
    @AGSaidi
    AGSaidi committed Jun 2, 2022
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