[EventPipe] Add Blocking EventPipe Mode - #129457

#129457

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mdh1418:eventpipe-nonlossy-block

Jul 14, 2026

Commits on Jun 15, 2026

Add the Block (non-lossy) EventPipe buffering mode
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Commits on Jun 16, 2026

Park EventPipe producers on full buffers in Block mode
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Dispatch provider callbacks from ep_start_streaming
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Detach deferred provider callbacks under the EventPipe lock
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Commits on Jun 18, 2026

Harden EventPipe Block-mode teardown and deferred callback dispatch
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Add unit test for Block-mode buffer manager abort and disable
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Commits on Jun 22, 2026

Address review feedback on Block-mode buffer manager
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Commits on Jun 23, 2026

Add an explicit FIFO wait queue for parked Block-mode producers
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Commits on Jun 25, 2026

Replace deferred provider-callback queue with session_init/enable split
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Start EventPipe session drain threads eagerly as native threads
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Exclude Block buffering mode from single-threaded (PERFTRACING_DISABLE_THREADS) builds
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Restrict Block buffering mode to streaming session types
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Add CollectTracing6 IPC command to opt into Block buffering mode
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Add DOTNET_EventPipeBufferingMode env-var opt-in for the startup session
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Rename ep_start_streaming to ep_start_session
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Merge remote-tracking branch 'upstream/main' into eventpipe-nonlossy-block
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Address Copilot review feedback
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Commits on Jul 6, 2026

Attach EventPipe session drain thread at the minimum level on Mono and NativeAOT
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Commits on Jul 8, 2026

Address PR feedback: drop Block-mode alloc fallbacks and cleanup
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Rename ep_enable/_2/_3 to ep_init_session/_2/_3
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Address review feedback: reject invalid buffering-mode configs; account teardown drops
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Commits on Jul 9, 2026

Only park Block-mode writers on buffer-capacity exhaustion
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Commits on Jul 10, 2026

Address feedback
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Commits on Jul 13, 2026

Address feedback
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