--- old/src/share/vm/gc_implementation/shared/plab.cpp	2015-04-17 19:08:40.962779845 +0300
+++ new/src/share/vm/gc_implementation/shared/plab.cpp	2015-04-17 19:08:40.886778661 +0300
@@ -39,7 +39,7 @@
 
 PLAB::PLAB(size_t desired_plab_sz_) :
   _word_sz(desired_plab_sz_), _bottom(NULL), _top(NULL),
-  _end(NULL), _hard_end(NULL), _allocated(0), _wasted(0)
+  _end(NULL), _hard_end(NULL), _allocated(0), _wasted(0), _undo_wasted(0)
 {
   // ArrayOopDesc::header_size depends on command line initialization.
   AlignmentReserve = oopDesc::header_size() > MinObjAlignment ? align_object_size(arrayOopDesc::header_size(T_INT)) : 0;
@@ -62,13 +62,15 @@
   // Now flush the statistics.
   stats->add_allocated(_allocated);
   stats->add_wasted(_wasted);
+  stats->add_undo_wasted(_undo_wasted);
   stats->add_unused(unused);
 
   // Since we have flushed the stats we need to clear  the _allocated and _wasted
   // fields in case somebody retains an instance of this over GCs. Not doing so
   // will artifically inflate the values in the statistics.
-  _allocated = 0;
-  _wasted = 0;
+  _allocated   = 0;
+  _wasted      = 0;
+  _undo_wasted = 0;
 }
 
 void PLAB::retire() {
@@ -98,8 +100,9 @@
            err_msg("Inconsistency in PLAB stats: "
                    "_allocated: "SIZE_FORMAT", "
                    "_wasted: "SIZE_FORMAT", "
-                   "_unused: "SIZE_FORMAT,
-                   _allocated, _wasted, _unused));
+                   "_unused: "SIZE_FORMAT", ",
+                   "_undo_wasted: "SIZE_FORMAT, 
+                   _allocated, _wasted, _unused, _undo_wasted));
 
     _allocated = 1;
   }