RFR(xs): 8202073: MetaspaceAllocationTest gtest shall lock during space creation

Thomas Stüfe thomas.stuefe at gmail.com
Fri Apr 20 07:11:38 UTC 2018

May I please have reviews for this small fix to the

Bug: https://bugs.openjdk.java.net/browse/JDK-8202073

webrev: http://cr.openjdk.java.net/~stuefe/webrevs/8202073-MetaspaceAllocationTest-gtest-shall-lock-during-space-creation/webrev.00/webrev/

MetaspaceAllocationTest mimicks ClassLoaderMetaspace creation,
allocation and destruction to stress metaspace allocation.

So it runs outside the normal create-allocate-delete cycle in the VM.
For instance, there are no associated ClassLoaderData. So, the test
needs to mimick the surroundings of the VM.

This means, when creating ClassLoaderMetaspace objects, the test needs
to lock its associated lock. In the VM, this happens in
ClassLoaderData::metaspace_non_null(), and there the associated lock
is pulled before allocation too.

Thanks, Thomas

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