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vt-pinning: diagnosing virtual thread pinning companion code

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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
This commit is contained in:
asmhatre
2026-09-30 06:35:35 +00:00
co-authored by Claude Sonnet 5
parent ff183da163
commit 0819993c51
18 changed files with 725 additions and 0 deletions
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vt-pinning/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.ankurm</groupId>
<artifactId>java-core-examples</artifactId>
<version>1.0</version>
</parent>
<artifactId>vt-pinning</artifactId>
<name>vt-pinning</name>
<description>Diagnosing virtual thread pinning in production: reproducing the native-code pinning JEP 491 didn't fix, reading the jdk.VirtualThreadPinned JFR event, and finding a pinned carrier in a jcmd thread dump.</description>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.13.0</version>
<configuration>
<release>25</release>
</configuration>
</plugin>
</plugins>
</build>
</project>