[11u] RFR (S) 8252660: Shenandoah: support manageable SoftMaxHeapSize option

[Zhengyu Gu]

Good to me.

Thanks,

-Zhengyu

On 9/21/20 2:15 AM, Aleksey Shipilev wrote:
> Friendly reminder.
> 
> On 9/7/20 1:29 PM, Aleksey Shipilev wrote:
>> Original RFE:
>>     https://bugs.openjdk.java.net/browse/JDK-8252660
>>     https://hg.openjdk.java.net/jdk/jdk/rev/6ab9279c0e99
>>
>> The patch does not apply cleanly to 11u, because there are conflicts 
>> in APIs.
>>
>> I had to resolve these:
>>     *) There is no Atomic::store(&size_t, size_t), replaced with 
>> OrderAccess::release_store_fence, as
>> in other places in 11u.
>>     *) There is no global SoftMaxHeapSize, replaced it with 
>> ShenandoahSoftMaxHeapSize and added
>> relevant verifications to make new Shenandoah tests pass.
>>
>> 11u webrev:
>>     https://cr.openjdk.java.net/~shade/8252660/webrev.11u.01/
>>
>> Testing: hotspot_gc_shenandoah, tier{1,2} with Shenandoah
> 
>