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

[Kirill Zhaldybin]

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