[release/10.0] Avoid custom attribute routine in NetEventSource #120431
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noahfalk
approved these changes
Oct 6, 2025
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Tagging subscribers to this area: @dotnet/ncl |
JulieLeeMSFT
added
the
NO-MERGE
…ns.Concurrent.ConcurrentCollectionsEventSource to use string based constructors
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@EgorBot scenario-awslambda -arm -intel |
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Backport of #120422 to release/10.0
/cc @ManickaP @EgorBo
Customer Impact
.NET 10.0 regressed startup time for trivial workloads as was reported by the AWS team in #120288. We suspect it's some new generic instantiations we introduced in .NET 10.0 around number parsing, since that is not easy to fix/backport, we just applied a few general improvements to regain the losses. This PR removes redundant GetCustomAttribute calls by setting EventSource name in tha base ctor instead of relying on the reflection to obtain it from the attribute. We plan to simplify/automate this with a Source Generator (in fact, it's already done like that in the corelib), but for now it's changed by hands. This PR improves this sub-graph.
Regression
Testing
Validated that events are collected normally
Risk
Low