RFR: 8234010: ZGC: Change ZResurrection to use Atomic::load/store
stefan.karlsson at oracle.com
Fri Nov 22 11:16:09 UTC 2019
On 2019-11-22 12:08, erik.osterlund at oracle.com wrote:
> Hi Stefan,
> Looks good.
> On 11/21/19 2:24 PM, Stefan Karlsson wrote:
>> Hi all,
>> Please review this patch to change ZResurrection to use Atomic::load
>> and Atomic::store.
>> Previously, ZResurrection::is_blocked() and ZResurrection::unblock()
>> used loadload and storestore barriers to synchronize between the GC
>> and mutator load barriers.
>> JDK-8230661 changed so that we always perform a handshake before the
>> ZResurrection::unblock() call.
>> After that change we can rely on the handshake to perform the
>> necessary synchronization, and we can change the implementation to use
>> Atomic::load and Atomic::store.
>> Tested with tier1-7
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