JDK-8048112 : G1 Full GC needs to support the case when the very first region is not available
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u40,9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-06-25
  • Updated: 2015-01-21
  • Resolved: 2014-07-21
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8u40Fixed 9 b26Fixed
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When decommitting memory within the heap, it may be possible that the first region of the heap is decommitted as well, and not available for g1 full gc/compaction.

However the current implementation of G1 full GC hardcodes the first compaction space (ie. the area to compact into) as exactly this first region.

This constraintt needs to be relaxed to allow JDK-8038423
This CR is about refactoring the code properly to allow use for the CMM changes JDK-8038423.