JDK-6765954 : par compact - stress mode for splitting young gen spaces
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs14
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2008-10-31
  • Updated: 2010-04-02
  • Resolved: 2009-01-31
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JDK 6 JDK 7 Other
6u14Fixed 7Fixed hs14Fixed
Related Reports
Relates :  
JDK-6786188 - par compact - "SplitALot" stress mode should fill to_space
Relates :  
JDK-6765745 - par compact - allow young gen spaces to be split
Description
CR 6765745 (par compact - allow young gen spaces to be split) introduces a feature which is not exercised often in normal use.  Build a stress mode into debug JVMs to provoke splitting young gen spaces.
Comments
SUGGESTED FIX Attached.
12-12-2008
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/0f773163217d
12-12-2008
EVALUATION Add code to fill unused parts of the young gen and old gen with dummy live objects, and set the dense prefix in the old gen, to provoke splitting a young gen space. The filling must occur during the summary phase of par compaction.
31-10-2008