RFR (XS): JDK-8061449: G1: FreeRegionList_test() fails with G1 after the JDK-8058534 fix to HeapRegion::orig_end()

[Stefan Karlsson]

On 2014-11-05 10:10, Bengt Rutisson wrote:
>
> Hi again,
>
> StefanK noticed that I my patch created the same MemRegion for all 
> heap regions. This still made the test pass, but was not my intention. 
> Here's an updated webrev:
>
> http://cr.openjdk.java.net/~brutisso/8061449/webrev.01/

Looks good.

StefanK

>
> Bengt
>
>
> On 2014-11-05 09:59, Bengt Rutisson wrote:
>>
>> Hi all,
>>
>> Can I have a couple for reviews of a fix for this internal VM test?
>>
>> http://cr.openjdk.java.net/~brutisso/8061449/webrev.00/
>>
>> Bug link:
>> https://bugs.openjdk.java.net/browse/JDK-8061449
>>
>> Background:
>>
>> When this fix was pushed:
>>
>> Remove HeapRegion::_orig_end
>> https://bugs.openjdk.java.net/browse/JDK-8058534
>>
>> The heap region constructor actually examines the MemRegion that is 
>> passed to it. In the internal VM tests there was a test, 
>> FreeRegionList_test(), that passed a random MemRegion to the heap 
>> region constructor. This worked before, but now stopped working. The 
>> original fix, JDK-8058534, is correct so the fix for the failing test 
>> is to set up proper memory regions and pass those to the heap region 
>> constructors.
>>
>> Before my suggested patch this fails:
>>
>> $ java -XX:+ExecuteInternalVMTests -XX:+UseG1GC -version
>>
>> The test fails on this assert in HeapRegion::hr_clear():
>>
>> assert(_end == orig_end(),
>>
>> With my suggested patch all tests pass with the above command line.
>>
>> Thanks,
>> Bengt
>