JDK-8162952 : Zero copy concurrent mark global mark stack push and pops
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 9
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2016-08-02
  • Updated: 2019-02-11
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8159422 - Very high Concurrent Mark mark stack contention
Description
When copying chunks of references to the global mark stack, g1 first collects them in a local array, and then copies them over to the global mark stack.
The same in reverse during fetching items from the global mark stack.

This is an additional additional copy of the references both ways. Remove the need for the additional copy.