src/hotspot/share/gc/cms/parNewGeneration.cpp

rev 52211 : [mq]: 8212753-improve-forward-to-atomic

*** 1116,1126 ****
    if (new_obj == NULL) {
      // Either to-space is full or we decided to promote try allocating obj tenured
  
      // Attempt to install a null forwarding pointer (atomically),
      // to claim the right to install the real forwarding pointer.
!     forward_ptr = old->forward_to_atomic(ClaimedForwardPtr);
      if (forward_ptr != NULL) {
        // someone else beat us to it.
          return real_forwardee(old);
      }
  
--- 1116,1126 ----
    if (new_obj == NULL) {
      // Either to-space is full or we decided to promote try allocating obj tenured
  
      // Attempt to install a null forwarding pointer (atomically),
      // to claim the right to install the real forwarding pointer.
!     forward_ptr = old->forward_to_atomic(ClaimedForwardPtr, m);
      if (forward_ptr != NULL) {
        // someone else beat us to it.
          return real_forwardee(old);
      }
  
*** 1142,1152 ****
      forward_ptr = NULL;
    } else {
      // Is in to-space; do copying ourselves.
      Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)new_obj, sz);
      assert(CMSHeap::heap()->is_in_reserved(new_obj), "illegal forwarding pointer value.");
!     forward_ptr = old->forward_to_atomic(new_obj);
      // Restore the mark word copied above.
      new_obj->set_mark_raw(m);
      // Increment age if obj still in new generation
      new_obj->incr_age();
      par_scan_state->age_table()->add(new_obj, sz);
--- 1142,1152 ----
      forward_ptr = NULL;
    } else {
      // Is in to-space; do copying ourselves.
      Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)new_obj, sz);
      assert(CMSHeap::heap()->is_in_reserved(new_obj), "illegal forwarding pointer value.");
!     forward_ptr = old->forward_to_atomic(new_obj, m);
      // Restore the mark word copied above.
      new_obj->set_mark_raw(m);
      // Increment age if obj still in new generation
      new_obj->incr_age();
      par_scan_state->age_table()->add(new_obj, sz);