JDK-8027554 : Implicit in-heap check in G1CollectedHeap::in_cset_fast_test() not always required
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs25,8
  • Priority: P4
  • Status: Closed
  • Resolution: Duplicate
  • Submitted: 2013-10-30
  • Updated: 2014-04-08
  • Resolved: 2014-02-20
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JDK 9
9Resolved
Related Reports
Duplicate :  
JDK-8035326 - Assume non-NULL references in G1CollectedHeap::in_cset_fast_test
Relates :  
JDK-8027553 - Change the in_cset_fast_test functionality to use the G1BiasedArray abstraction
Description
G1CollectedHeap::in_cset_fast_test() implicitly checks whether the given reference is within the G1 heap. Particularly in some closure code, this check is already performed earlier (mostly the NULL check).

This additional check is not required in these cases.

The suggestion is to add a variant that does not do this implicit bounds check.
Comments
Note that the use of G1BiasedArray in JDK-8027553 would get you the necessary asserts for free, so it is advantageous to do that first.
30-10-2013