RFR: 8252513: ZGC: Contiguous memory reservation probing is broken for TB heap sizes

[Erik Österlund]

Hi Stefan,

Looks good.

Thanks,
/Erik

On 2020-08-31 13:13, Stefan Karlsson wrote:
> Hi all,
>
> Please review this patch to fix memory reservation probing for large 
> heap size.
>
> https://cr.openjdk.java.net/~stefank/8252513/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8252513
>
> If the passed in 'size' is equal to ZAddressOffsetMax, both 'end' and 
> 'increment' becomes 0, and the code will loop forever.
>
> I've changed the code to at least increment with ZGranuleSize. I've 
> also replaced the usage of 'start <= end', with 'start + size <= 
> ZAddressOfsetMax', since it  makes the code easier to reason about, IMHO.
>
> Thanks,
> StefanK