RFR: 8205651: TestLargeRootSet fails with exception: Could not find root object

[Markus Gronlund]

Looks good.

Markus

-----Original Message-----
From: Erik Gahlin 
Sent: den 14 december 2018 21:47
To: hotspot-jfr-dev at openjdk.java.net
Subject: RFR: 8205651: TestLargeRootSet fails with exception: Could not find root object

Hi,

Could I have a review of a test that has failed intermittently. By increasing the size of the StackObject array the likelihood of the object sampler finding it increases.

I also added logging, so it is possible to see if the code path for a very large root set is taken. This is not the case, before or after the proposed change. It's hard to trigger that path. To start with, the heap must be at least 640 MB (32 MB/ 5%). I did however test with a modified JVM where the code path was triggered more easily and the test passed.

For now, I'm only making the test more stable and adding logging, so it easier to write a better test in the future.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8205651

Webrev:
http://cr.openjdk.java.net/~egahlin/8205651/

Thanks
Erik