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

[Aleksey Shipilev]

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


-- 
Thanks,
-Aleksey