JDK-8151069 : Parallelize clearing the per-thread concurrent mark data structures
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 9
  • Priority: P3
  • Status: Closed
  • Resolution: Won't Fix
  • Submitted: 2016-03-02
  • Updated: 2018-06-21
  • Resolved: 2016-03-14
Related Reports
Duplicate :  
JDK-8067500 - ConcurrentMark::abort() is excessively slow
Relates :  
JDK-8077144 - Concurrent mark initialization takes too long
Relates :  
JDK-8151125 - Unify clearing mark bitmaps and concurrent mark data structures
Description
Clearing the per-thread concurrent mark data structures is single threaded. This is a bad idea in case of large heaps, significantly lengthening the concurrent mark cycle.

Parallelize this phase.
Comments
By taking a different approach in JDK-8077144, this change is not required any more.
14-03-2016