RFR: Use leftmost region in GC allocations

[Roman Kennke]

Am 07.02.2018 um 12:51 schrieb Aleksey Shipilev:
> On 02/06/2018 09:06 PM, Dominik Inführ wrote:
>> Yes, but AFAIU idx is of type size_t. So if _leftmost is 0, we would have idx >= 0, which is always
>> true for unsigned types and we would have an endless loop.
> 
> Right! Unsigned data types, argh.
> 
> Let's go with this variant:
>    http://cr.openjdk.java.net/~shade/shenandoah/freeset-leftmost/webrev.01/
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks,
> -Aleksey
> 
> 

Looks ok


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