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asmhatreandClaude Sonnet 5 0819993c51 vt-pinning: diagnosing virtual thread pinning companion code
Reproduces the pinning JEP 491 did not fix (native JNI frames) with a real
native library, alongside the monitor case it did fix. Covers the
jdk.VirtualThreadPinned JFR event, reading pinned vs unmounted virtual
threads from a jcmd Thread.dump_to_file, the measured throughput cost on a
capped carrier pool, and a bounded-executor pattern to contain the blast
radius.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
2026-09-30 06:35:35 +00:00

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$ java -Djdk.virtualThreadScheduler.parallelism=2 BoundedNativeCallDemo direct
mode=direct parallelism=2 pinningCount=2 unrelatedCount=6 unrelatedWorkDoneAtMs=924 totalElapsedMs=924
$ java -Djdk.virtualThreadScheduler.parallelism=2 BoundedNativeCallDemo bounded
mode=bounded parallelism=2 pinningCount=2 unrelatedCount=6 unrelatedWorkDoneAtMs=126 totalElapsedMs=826