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Update spin-wait pause/yield normalization #55295

Merged
merged 5 commits into from
Jul 13, 2021
Merged

Update spin-wait pause/yield normalization #55295

merged 5 commits into from
Jul 13, 2021

Commits on Jul 7, 2021

  1. Update spin-wait pause/yield normalization 

    - Modified the measurement to use much less time and to remeasure periodically to reduce CPU usage during startup
- Each measurement does a low-microsecond-level measurement of pause/yield times
- Some small amount of history of recent measurements is retained and used to for now take the lowest measurement for normalization
- Measurements are done lazily, and at most every few seconds another measurement is taken
- Added a profiling event that includes info about a measurement and the established value from recent measurements that is used for normalization
    @kouvel
    kouvel committed Jul 7, 2021
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Commits on Jul 8, 2021

  1. Fix the other half of the potential for torn memory accesses

    @kouvel
    kouvel committed Jul 8, 2021
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  2. Address feedback

    @kouvel
    kouvel committed Jul 8, 2021
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Commits on Jul 9, 2021

  1. Add check to see if event is enabled

    @kouvel
    kouvel committed Jul 9, 2021
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Commits on Jul 10, 2021

  1. Fix signed/unsigned mismatch

    @kouvel
    kouvel committed Jul 10, 2021
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