[release/11.0] Use lock-free reads for ETW rundown versions - #133043
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The current ETW rundown code holds a `CodeVersionManager` lock across the full JIT method enumeration and ETW event emission. This can block JIT paths and delay code execution. This code change removes rundown-wide `CodeVersionManager` lock and instead relies on lock-free reads of published native-code version state. It builds on PR #[102298](#102298) and PR #[107152](#107152), which established published version state and lock-free read-only version lookups. It is noteworthy that a concurrent ReJIT or tiering update may cause rundown to skip over a newly inserted node or skip a record when code-address validation fails (if it is in the middle of an update). The benefit of a `CodeVersionManager` lock-free rundown likely outweighs guaranteeing a globally atomic rundown snapshot. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Copilot-Session: 08e6544d-6999-41a6-85b2-cbd9ea6fe071
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Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag |
steveisok
approved these changes
Sep 1, 2026
This was referenced Sep 2, 2026
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/ba-g Known helix job monitor issue. |
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Backport of #132757 to release/11.0
/cc @tommcdon
Customer Impact
Reported by an internal partner team. Applications with large numbers of JIT-compiled methods can spend several seconds performing ETW rundown while holding the global code-versioning lock. JIT paths that need the same lock can be delayed for the duration of rundown, blocking code execution.
Regression
No. This fixes longstanding lock contention in the ETW rundown implementation.
Testing
Risk