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Avoid double scan stacks in continuation for compact cases #16022

Merged
merged 1 commit into from
Oct 5, 2022
Merged

Avoid double scan stacks in continuation for compact cases #16022

merged 1 commit into from
Oct 5, 2022

Commits on Oct 4, 2022

  1. Avoid double scan stacks in continuation for compact case 

    When virtual thread mounts to J9VMThread, the GC might scan java stack
of the related continuation twice (one from
J9VMThread.currentContinuation during thread scanning, another one from
the related live continuation Object).
Scan twice the same java stack during compaction fix-up might cause
wrong double fixup and we also might need to both scan for concurrent
 case(there is no issue for double scan in concurrent collectors).
 so we stop to scan the stack of the continuation Object, which is
mounted to the J9VMThread for STW collectors.

Signed-off-by: Lin Hu <linhu@ca.ibm.com>
    @LinHu2016
    LinHu2016 committed Oct 4, 2022
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