asmhatreandClaude Sonnet 5
0819993c51
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
23 lines
972 B
Plaintext
23 lines
972 B
Plaintext
$ java -Djdk.tracePinnedThreads=full NativePinningDemo (pre-JDK-24 runtime)
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java.version=21.0.10
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jdk.tracePinnedThreads=full
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sleepMillis=200
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VirtualThread[#18]/runnable@ForkJoinPool-1-worker-1 reason:NATIVE
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java.base/java.lang.VirtualThread$VThreadContinuation.onPinned(VirtualThread.java:199)
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java.base/jdk.internal.vm.Continuation.onPinned0(Continuation.java:393)
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java.base/java.lang.VirtualThread.parkNanos(VirtualThread.java:635)
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java.base/java.lang.VirtualThread.sleepNanos(VirtualThread.java:807)
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java.base/java.lang.Thread.sleep(Thread.java:507)
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com.ankurm.vtpinning.NativePinningDemo.sleepCallback(NativePinningDemo.java:30)
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com.ankurm.vtpinning.NativePinningDemo.blockingNativeCall(Native Method)
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java.base/java.lang.VirtualThread.run(VirtualThread.java:329)
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done
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$ java -Djdk.tracePinnedThreads=full NativePinningDemo (JDK 24+ runtime - flag is inert)
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java.version=25.0.4.1
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jdk.tracePinnedThreads=full
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sleepMillis=200
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done
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