JDK-8034246 : remove CMS and ParNew adaptive size policy code
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-02-12
  • Updated: 2018-10-30
  • Resolved: 2014-06-27
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JDK 9
9 b24Fixed
Related Reports
Relates :  
JDK-8213113 - Dead code related to UseAdaptiveSizePolicy in ParNewGeneration
Relates :  
JDK-8027067 - Flag UsePSAdaptiveSurvivorSizePolicy needs to be named UseAdaptiveSurvivorSizePolicy
Description
The adaptive size policy code for CMS and ParNew is incomplete and cannot be used (there is code in place to prevent if from being enabled) and we do not have a plan to finish it.  The code should be removed.
Comments
Use an instance of the shared AdaptiveSizePolicy class for CMS' size policy instead of CMSAdaptiveSizePolicy and remove calls to CMS-specific size policy methods (most are guarded by "if (UseAdaptiveGCPolicy)". This should allow deletion of the files cmsAdaptiveSizePolicy.* and cmsGCAdaptivePolicyCounters.*. The files asParNewGeneration.* can also be removed.
12-02-2014