JDK-8037925 : CMM Testing: an allocated humongous object at the end of the heap should not prevents shrinking the heap
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 7,8,9
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-03-20
  • Updated: 2015-01-21
  • Resolved: 2014-04-15
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8u40Fixed 9 b12Fixed
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Need a test checking that allocating new humongous objects doesn't prevent g1 from shrinking area allocated earlier and recently reclaimed.

Scenario should like:

 eat(area1);     // allocated humongous objects in area1
 committed1 = getCommitted();
 eat(area2);    // allocated humongous objects in area2
 committed2 = getCommitted();
 eat(area3);    // allocated humongous objects in arae3
 committed3 = getCommitted();
 free(area1);   // reclaim objects in area1
 free(area2);   // reclaim objects in area2

check(   getCommitted()  ~= committed1)