[8u] RFR(xxs): 8241444: Metaspace::_class_vsm not initialized if compressed class pointers are disabled

[Thomas Stüfe]

Hi all,

May I have reviews for a trivial fix to Metaspace on jdk8 please.

It has been inadvertently fixed on JDK11 with "8199431: Split up class
Metaspace into a static and a non-static part" so its only an issue on
jdk8-10.

Issue:

https://bugs.openjdk.java.net/browse/JDK-8241444

Patch:

thomas at mainframe:/shared/projects/openjdk/jdk8udev/source/hotspot$ hg diff
diff -r e6a26331730f src/share/vm/memory/metaspace.cpp
--- a/src/share/vm/memory/metaspace.cpp Fri May 08 14:00:24 2015 -0400
+++ b/src/share/vm/memory/metaspace.cpp Tue Mar 24 15:53:17 2020 +0100
@@ -3390,6 +3390,8 @@
   if (using_class_space()) {
     // Allocate SpaceManager for classes.
     _class_vsm = new SpaceManager(ClassType, lock);
+  } else {
+    _class_vsm = NULL;
   }

   MutexLockerEx cl(SpaceManager::expand_lock(),
Mutex::_no_safepoint_check_flag);

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I guess I need a sponsor since I am not a committer for 8u.

Thanks, Thomas