RFR: 8221786: ZGC: Increase max heap size to 16TB

[Stefan Karlsson]

Looks good.

StefanK

On 2019-04-09 13:34, Per Liden wrote:
> Updated webrev after StefanK spotted errors in the ASCII diagrams.
>
> http://cr.openjdk.java.net/~pliden/8221786/webrev.1
>
> /Per
>
> On 4/1/19 10:14 PM, Per Liden wrote:
>> Increase max heap size to 16TB. We could just bump 
>> ZPlatformAddressOffsetBits to 44, but we should take the opportunity 
>> to make this slightly more dynamic and set ZPlatformAddressOffsetBits 
>> at runtime. As a start, I propose that we limit the dynamic behavior 
>> to an address space reservation of 4TB, 8TB or 16TB (per heap view), 
>> depending on what -Xmx is set to. In the future we could have a more 
>> elaborate scheme if we find a need for that.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8221786
>> Webrev: http://cr.openjdk.java.net/~pliden/8221786/webrev.0
>>
>> /Per