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Release notes for 0.12.0 milestone 2 #4215

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Release notes for 0.12.0 milestone 2 #4215

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41 changes: 31 additions & 10 deletions doc/release-notes/0.12/0.12.md
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<!--
* Copyright (c) 2017, 2018 IBM Corp. and others
* Copyright (c) 2017, 2019 IBM Corp. and others
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
Expand All @@ -25,7 +25,7 @@
# Eclipse OpenJ9 version 0.12.0 release notes

:construction:
These release notes are under construction and are not yet complete. The content reflects the December milestone build of Eclipse OpenJ9.
These release notes are under construction and are not yet complete. The content reflects the January milestone build of Eclipse OpenJ9.

These release notes support the [Eclipse OpenJ9 0.12.0 release plan](https://projects.eclipse.org/projects/technology.openj9/releases/0.12.0/plan).

Expand All @@ -37,7 +37,7 @@ OpenJ9 release 0.12.0 supports OpenJDK 8 and OpenJDK 11. Binaries are available
- [OpenJDK with OpenJ9 version 8](https://adoptopenjdk.net/archive.html?variant=openjdk8&jvmVariant=openj9)
- [OpenJDK with OpenJ9 version 11](https://adoptopenjdk.net/archive.html?variant=openjdk11&jvmVariant=openj9)

OpenJ9 release 0.12.0 provides limited support for the MacOS platform on OpenJDK 8. Early builds of OpenJDK 8 with OpenJ9 on MacOS are available at the AdoptOpenJDK project at the following link:
OpenJ9 release 0.12.0 provides support for the MacOS platform on OpenJDK 8. Early builds of OpenJDK 8 with OpenJ9 on MacOS are available at the AdoptOpenJDK project at the following link:

- [OpenJDK v8 with OpenJ9](https://adoptopenjdk.net/nightly.html?variant=openjdk8&jvmVariant=openj9)

Expand All @@ -63,13 +63,7 @@ The following table covers notable changes in v0.12.0. Further information about
<tr><td valign="top"><a href="https://github.com/eclipse/openj9/pull/3446">#3446</a></td>
<td valign="top">Improved flexibility for managing the size of the JIT code cache</td>
<td valign="top">OpenJDK8 and later (All platforms)</td>
<td valign="top">The size of the JIT code cache (`-Xcodecachetotal`) can now be decreased as well as increased, with a minimum size of 2 MB</td>
</tr>

<tr><td valign="top"><a href="https://github.com/eclipse/openj9/issues/3854">#3854</a></td>
<td valign="top">Class data sharing is enabled by default</td>
<td valign="top">OpenJDK 8 and later (All platforms except macOS)</td>
<td valign="top">Class data sharing is enabled by default for bootstrap classes, unless your application is running in a container. Use the `-Xshareclasses` option to change the default behavior.</td>
<td valign="top">The size of the JIT code cache (-Xcodecachetotal) can now be decreased as well as increased, with a minimum size of 2 MB</td>
</tr>

<tr><td valign="top"><a href="https://github.com/eclipse/openj9/pull/3992">#3992</a></td>
Expand All @@ -90,6 +84,26 @@ The following table covers notable changes in v0.12.0. Further information about
<td valign="top">When this mode is enabled, (`-Xgc:concurrentScavenge`) the VM attempts to reduce GC pause-times for response-time sensitive, large heap applications. This mode is now available on large heap (non-compressed references) builds. </td>
</tr>

<tr><td valign="top"><a href="https://github.com/eclipse/openj9/issues/4108">#4108</a></td>
<td valign="top">Concurrent scavenge mode is now available on Windows x86</td>
<td valign="top">OpenJDK8 and later (x86-64: Windows only)</td>
<td valign="top">When this mode is enabled, (`-Xgc:concurrentScavenge`) the VM attempts to reduce GC pause-times for response-time sensitive applications. </td>
</tr>

<tr><td valign="top"><a href="https://github.com/eclipse/openj9/issues/3226">#3226</a></td>
<td valign="top">Idle-tuning is enabled by default</td>
<td valign="top">OpenJDK8 and later (Linux only)</td>
<td valign="top">When OpenJ9 is running in a container, a garbage collection cycle and compaction of the object heap is attempted when
the state of the VM is set to idle. </td>
</tr>

<tr><td valign="top"><a href="https://github.com/eclipse/openj9/pull/4025">#4025</a></td>
<td valign="top">Changes to the default permissions of shared classes cache directories</td>
<td valign="top">OpenJDK8 and later (All platforms except Windows)</td>
<td valign="top">Tighter restrictions are imposed on existing and new shared classes cache directories. For further
information about this change, see the <a href="https://www.eclipse.org/openj9/docs/version0.12/">user documentation</a>.</td>
</tr>

</table>


Expand All @@ -116,6 +130,13 @@ The v0.12.0 release contains the following known issues and limitations:
<td valign="top">None</td>
</tr>

<tr><td valign="top"><a href="https://github.com/eclipse/openj9/issues/4222">#4222</a></td>
<td valign="top">Shared classes no longer enabled by default</td>
<td valign="top">All platforms</td>
<td valign="top">In milestone 1, shared classes were enabled by default. This change has been reverted due to a performance regression.</td>
<td valign="top">None</td>
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The workaround is to explicitly enable -Xshareclasses:bootClassesOnly or -Xshareclasses.

</tr>

<tr><td valign="top"><a href="https://github.com/ibmruntimes/openj9-openjdk-jdk8/issues/129">#129</a></td>
<td valign="top">OpenSSL support</td>
<td valign="top">AIX</td>
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