RFR: 8240714: ZGC: TestSmallHeap.java failed due to OutOfMemoryError

[Erik Österlund]

Hi Per,

Looks good.

Thanks,
/Erik

> On 10 Mar 2020, at 18:20, Per Liden <per.liden at oracle.com> wrote:
> 
> The gc/z/TestSmallHeap.java test failed once due to OutOfMemoryError. When using a 8M heap, this test is fairly sensitive in the sense that the heap will be very crowded and the heap headroom is small. When running as "main/othervm" there are additional jtreg threads running in the VM. These threads can apparently (sometimes?) allocate enough memory to disturb the test itself, pushing it over the edge with OOME as a result. To avoid having these threads running in the same VM as the test itself I've adjusted the test to spawn a new test VM through ProcessTools.
> 
> Webrev: http://cr.openjdk.java.net/~pliden/8240714/webrev.0
> Bug: https://bugs.openjdk.java.net/browse/JDK-8240714
> 
> Testing: Manual
> 
> cheers,
> Per
>