RFR: 8234010: ZGC: Change ZResurrection to use Atomic::load/store

Stefan Karlsson stefan.karlsson at oracle.com
Thu Nov 21 13:24:11 UTC 2019

Hi all,

Please review this patch to change ZResurrection to use Atomic::load and 


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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