src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp

rev 7903 : imported patch skip_stale

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 220,229 ****
--- 220,250 ----
    return _bm.par_clear_bit(heapWordToOffset(addr));
  }
  
  #undef check_mark
  
+ inline bool CMTask::is_stale_humongous_queue_entry(oop obj) const {
+   // When a humongous object is eagerly reclaimed, we don't remove
+   // entries for it from queues.  Instead, we filter out such entries
+   // on the processing side.
+   //
+   // Recently allocated objects are filtered out when queuing, to
+   // minimize queue size and processing time.  Therefore, if we find
+   // what appears to be a recently allocated object in the queue, it
+   // must be for a reclaimed humongous object.
+   HeapRegion* hr = _g1h->heap_region_containing_raw(obj);
+   bool result = hr->obj_allocated_since_next_marking(obj);
+ #ifdef ASSERT
+   if (result) {
+     HeapWord* hp = (HeapWord*)obj;
+     assert(hp == hr->bottom(), "stale humongous should be at region bottom");
+     assert(!_nextMarkBitMap->isMarked(hp), "stale humongous should not be marked");
+   }
+ #endif
+   return result;
+ }
+ 
  inline void CMTask::push(oop obj) {
    HeapWord* objAddr = (HeapWord*) obj;
    assert(_g1h->is_in_g1_reserved(objAddr), "invariant");
    assert(!_g1h->is_on_master_free_list(
                _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant");