[release/9.0] Fix trimming for DiagnosticSource #106842
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Recent changes to EventSource startup caused the IL trimmer to include portions of the DiagnosticSource assembly. Adding the IsMeterSupported feature check wasn't sufficient because EventSource also roots all of its methods via a DynamicallyAccessedMembers attribute. To ensure that the new methods can be removed when needed I refactored them into a separate EventSourceInitHelper class that won't be rooted by the existing DAM attribute. When EventSouce.IsSupported is false I'd expect the entire EventSourceInitHelper class to be unreachable. If only EventSource.IsMeterSupported is false then I'd expect PreregisterEventProviders and GetMetricsEventSource() to be unreachable but the rest of the class will remain. Hopefully this really fixes #106265 this time.
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Tagging subscribers to this area: @tarekgh, @tommcdon, @pjanotti |
jeffschwMSFT
approved these changes
Aug 22, 2024
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@vitek-karas - could you approve this one as well? It should be unmodified from what you saw in the 10.0 branch. |
vitek-karas
approved these changes
Aug 23, 2024
This was referenced Aug 23, 2024
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Backport of #106680 to release/9.0
/cc @noahfalk
Customer Impact
A recent change caused a binary size regression for HelloWorld on Mono (Issue #106265).
Regression
Introduced in #106014
Testing
@vitek-karas confirmed the size had returned to normal looking at automated perf results. It was missed initially because perf testing doesn't occur automatically prior to PR merge and I didn't recognize the impact it would have on the IL linked binaries.
Risk
Low - the change executes exactly the same logic as before with some refactorings applied: