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Signed-off-by: genie-openj9 <openj9-bot@eclipse.org>
genie-openj9 committed Jan 25, 2025
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4 changes: 2 additions & 2 deletions version0.49/index.html
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@@ -9088,8 +9088,8 @@ <h3 id="suballocator-related-xgc-options-are-added-to-control-the-compressed-ref
</ul>
<p>For more information, see <a href="../allocation/#compressed-references">Compressed references</a>.</p>
<h3 id="new-xx-flightrecorder-option-added"><img alt="Start of content that applies to Java 11 (LTS) and later" src="../cr/java11plus.png" /> New <code>-XX:[+|-]FlightRecorder</code> option added</h3>
<p>This release supports, as a technical preview, the Java Flight Recorder (JFR) tool that is available for OpenJDK 11 and later running on Linux&reg; x86 and Linux on AArch64 only.</p>
<p>You can collect profiling and diagnostic information with the JFR tool. You can enable or disable the JFR tool in the VM with the <a href="../xxflightrecorder/"><code>-XX:[+|-]FlightRecorder</code></a> option. <img alt="End of content that applies only to Java 11 and later" src="../cr/java_close.png" /></p>
<p>This release supports, as a technical preview, JDK Flight Recorder (JFR) that is available for OpenJDK 11 and later running on Linux&reg; x86 and Linux on AArch64 only.</p>
<p>You can collect profiling and diagnostic information with JFR. You can enable or disable JFR in the VM with the <a href="../xxflightrecorder/"><code>-XX:[+|-]FlightRecorder</code></a> option. <img alt="End of content that applies only to Java 11 and later" src="../cr/java_close.png" /></p>
<h2 id="known-problems-and-full-release-information">Known problems and full release information</h2>
<p>To see known problems and a complete list of changes between Eclipse OpenJ9 v0.48.0 and v0.49.0 releases, see the <a href="https://github.com/eclipse-openj9/openj9/blob/master/doc/release-notes/0.49/0.49.md">Release notes</a>.</p>
<!-- ==== END OF TOPIC ==== version0.49.md ==== -->
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<h1 id="-xx-flightrecorder">-XX:[+|-]FlightRecorder</h1>
<p><strong>Linux&reg; on x86, Linux on AArch64</strong></p>
<p><img alt="Start of content that applies to Java 11 (LTS) and later" src="../cr/java11plus.png" /> This option enables or disables the Java Flight Recorder (JFR) tool in the VM. This built-in profiling and troubleshooting tool in the VM collects profiling and diagnostic information.</p>
<p><span aria-hidden="true" class="twemoji note"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! Font Awesome Free 6.5.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="m410.3 231 11.3-11.3-33.9-33.9-62.1-62.1-33.9-33.9-11.3 11.3-22.6 22.6L58.6 322.9c-10.4 10.4-18 23.3-22.2 37.4L1 480.7c-2.5 8.4-.2 17.5 6.1 23.7s15.3 8.5 23.7 6.1l120.3-35.4c14.1-4.2 27-11.8 37.4-22.2l199.2-199.2 22.6-22.7zM160 399.4l-9.1 22.7c-4 3.1-8.5 5.4-13.3 6.9l-78.2 23 23-78.1c1.4-4.9 3.8-9.4 6.9-13.3l22.7-9.1v32c0 8.8 7.2 16 16 16h32zM362.7 18.7l-14.4 14.5-22.6 22.6-11.4 11.3 33.9 33.9 62.1 62.1 33.9 33.9 11.3-11.3 22.6-22.6 14.5-14.5c25-25 25-65.5 0-90.5l-39.3-39.4c-25-25-65.5-25-90.5 0zm-47.4 168-144 144c-6.2 6.2-16.4 6.2-22.6 0s-6.2-16.4 0-22.6l144-144c6.2-6.2 16.4-6.2 22.6 0s6.2 16.4 0 22.6z"/></svg></span> <strong>Note:</strong> Support for the JFR tool is currently provided as a technical preview. All JFR-related <code>jcmd</code> options might change in future releases.</p>
<p><img alt="Start of content that applies to Java 11 (LTS) and later" src="../cr/java11plus.png" /> This option enables or disables JDK Flight Recorder (JFR) in the VM. This built-in profiling and troubleshooting feature in the VM collects profiling and diagnostic information.</p>
<p><span aria-hidden="true" class="twemoji note"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! Font Awesome Free 6.5.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="m410.3 231 11.3-11.3-33.9-33.9-62.1-62.1-33.9-33.9-11.3 11.3-22.6 22.6L58.6 322.9c-10.4 10.4-18 23.3-22.2 37.4L1 480.7c-2.5 8.4-.2 17.5 6.1 23.7s15.3 8.5 23.7 6.1l120.3-35.4c14.1-4.2 27-11.8 37.4-22.2l199.2-199.2 22.6-22.7zM160 399.4l-9.1 22.7c-4 3.1-8.5 5.4-13.3 6.9l-78.2 23 23-78.1c1.4-4.9 3.8-9.4 6.9-13.3l22.7-9.1v32c0 8.8 7.2 16 16 16h32zM362.7 18.7l-14.4 14.5-22.6 22.6-11.4 11.3 33.9 33.9 62.1 62.1 33.9 33.9 11.3-11.3 22.6-22.6 14.5-14.5c25-25 25-65.5 0-90.5l-39.3-39.4c-25-25-65.5-25-90.5 0zm-47.4 168-144 144c-6.2 6.2-16.4 6.2-22.6 0s-6.2-16.4 0-22.6l144-144c6.2-6.2 16.4-6.2 22.6 0s6.2 16.4 0 22.6z"/></svg></span> <strong>Note:</strong> Support for JFR is currently provided as a technical preview. All JFR-related <code>jcmd</code> options might change in future releases.</p>
<h2 id="syntax">Syntax</h2>
<pre><code> -XX:[+|-]FlightRecorder
</code></pre>
@@ -9003,7 +9003,7 @@ <h2 id="syntax">Syntax</h2>
</tbody>
</table>
<h2 id="explanation">Explanation</h2>
<p>If the JFR tool is enabled in the VM with the <code>-XX:+FlightRecorder</code> option, then you can trigger profile and diagnostic recording with the <a href="https://eclipse.dev/openj9/docs/tool_jcmd/"><code>jcmd</code></a> tool. Recording does not start automatically, it must be triggered.</p>
<p>If JFR is enabled in the VM with the <code>-XX:+FlightRecorder</code> option, then you can trigger profile and diagnostic recording with the <a href="https://eclipse.dev/openj9/docs/tool_jcmd/"><code>jcmd</code></a> tool. Recording does not start automatically, it must be triggered.</p>
<p>To start a recording, specify the following command:</p>
<pre><code>jcmd &lt;vmid | display name | 0&gt; JFR.start [filename=&lt;file_name_with_path&gt;] [duration=&lt;time_with_unit_of_time&gt;]

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