RFR(S): 8132723, 8132724: Add tests which check that soft/weak references to humongous objects should work correctly

[Dmitry Fazunenko]

Hi Kirill,

Looks fine to me.

Thanks,
Dima

On 25.11.2015 20:16, Kirill Zhaldybin wrote:
> Hi,
>
> I found an issue on fastdebug build - an assert due missing type cast.
>
> Fixed webrevs:
>     main: 
> http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132724/webrev.03/main/ 
> (wasn't changed comparing previous one)
>     hotspot: 
> http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132724/webrev.03/hotspot/ 
> ( added type casts in whitebox methods).
>
> Thank you.
>
> Regards, Kirill
>
> On 24.11.2015 22:05, Kirill Zhaldybin wrote:
>> Hi!
>>
>> Could you please review the following patch that adds a test that checks
>> that soft/weak references to humongous objects work correctly?
>>
>> The test checks that weak and soft references behave correspondingly
>> to actual object behavior:
>> 1. If an object is collected a weak/soft reference .get() should
>> return null.
>> 2. If an object is not collected a weak/soft reference .get() should
>> not return null.
>>
>> Two White Box API methods were added:
>> 1. g1BelongsToHumongousRegion which checks that address belongs to
>> humongous region
>> 2. g1BelongsToFreeRegion which checks that address belongs to free 
>> region
>> These methods do not  impact G1 performance/stability since they don't
>> change anything in G1 execution.
>>
>> The only used method from gc/testlibrary is waitTillCMCFinished, which
>> is under review here -
>> http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-November/015643.html 
>>
>>
>>
>> CR: https://bugs.openjdk.java.net/browse/JDK-8132723
>>      https://bugs.openjdk.java.net/browse/JDK-8132724
>>
>> Webrev:
>>      main:
>> http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132724/webrev.02/main/
>>      hotspot:
>> http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132724/webrev.02/hotspot/ 
>>
>>
>> Thank you.
>>
>> Regards, Kirill
>