wrong definition of MONGO_YIELD_CORE_FOR_SMT for arm64

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Major - P3
    • 4.9.0, 4.2.13, 4.4.5
    • Affects Version/s: None
    • Component/s: None
    • None
    • Fully Compatible
    • ALL
    • v4.4, v4.2
    • Dev Platform 2021-03-08
    • None
    • 3
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      MONGO_YIELD_CORE_FOR_SMT is defined as the yield instuction, but yield is just a nop in arm64.

      Using an "isb" instruction is a better implementation. The Instruction Synchronization Barrier will create a very small delay without taking other CPU resources, which is required while spinning on a spinlock.

              Assignee:
              Andrew Morrow (Inactive)
              Reporter:
              Tsahi Zidenberg
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                Created:
                Updated:
                Resolved: