--- old/src/share/vm/memory/defNewGeneration.cpp	2014-10-17 16:10:01.000000000 +0200
+++ new/src/share/vm/memory/defNewGeneration.cpp	2014-10-17 16:10:00.000000000 +0200
@@ -56,9 +56,7 @@
 
 // Methods of protected closure types.
 
-DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* g) : _g(g) {
-  assert(g->level() == 0, "Optimized for youngest gen.");
-}
+DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* g) : _g(g) { }
 bool DefNewGeneration::IsAliveClosure::do_object_b(oop p) {
   return (HeapWord*)p >= _g->reserved().end() || p->is_forwarded();
 }
@@ -83,39 +81,36 @@
 void DefNewGeneration::FastKeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); }
 
 DefNewGeneration::EvacuateFollowersClosure::
-EvacuateFollowersClosure(GenCollectedHeap* gch, int level,
+EvacuateFollowersClosure(GenCollectedHeap* gch,
                          ScanClosure* cur, ScanClosure* older) :
-  _gch(gch), _level(level),
-  _scan_cur_or_nonheap(cur), _scan_older(older)
+  _gch(gch), _scan_cur_or_nonheap(cur), _scan_older(older)
 {}
 
 void DefNewGeneration::EvacuateFollowersClosure::do_void() {
   do {
-    _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap,
+    _gch->oop_since_save_marks_iterate(Generation::Young, _scan_cur_or_nonheap,
                                        _scan_older);
-  } while (!_gch->no_allocs_since_save_marks(_level));
+  } while (!_gch->no_allocs_since_save_marks(Generation::Young));
 }
 
 DefNewGeneration::FastEvacuateFollowersClosure::
-FastEvacuateFollowersClosure(GenCollectedHeap* gch, int level,
+FastEvacuateFollowersClosure(GenCollectedHeap* gch,
                              DefNewGeneration* gen,
                              FastScanClosure* cur, FastScanClosure* older) :
-  _gch(gch), _level(level), _gen(gen),
-  _scan_cur_or_nonheap(cur), _scan_older(older)
+  _gch(gch), _gen(gen), _scan_cur_or_nonheap(cur), _scan_older(older)
 {}
 
 void DefNewGeneration::FastEvacuateFollowersClosure::do_void() {
   do {
-    _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap,
+    _gch->oop_since_save_marks_iterate(Generation::Young, _scan_cur_or_nonheap,
                                        _scan_older);
-  } while (!_gch->no_allocs_since_save_marks(_level));
+  } while (!_gch->no_allocs_since_save_marks(Generation::Young));
   guarantee(_gen->promo_failure_scan_is_complete(), "Failed to finish scan");
 }
 
 ScanClosure::ScanClosure(DefNewGeneration* g, bool gc_barrier) :
     OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier)
 {
-  assert(_g->level() == 0, "Optimized for youngest generation");
   _boundary = _g->reserved().end();
 }
 
@@ -125,7 +120,6 @@
 FastScanClosure::FastScanClosure(DefNewGeneration* g, bool gc_barrier) :
     OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier)
 {
-  assert(_g->level() == 0, "Optimized for youngest generation");
   _boundary = _g->reserved().end();
 }
 
@@ -166,7 +160,6 @@
 ScanWeakRefClosure::ScanWeakRefClosure(DefNewGeneration* g) :
   _g(g)
 {
-  assert(_g->level() == 0, "Optimized for youngest generation");
   _boundary = _g->reserved().end();
 }
 
@@ -184,9 +177,8 @@
 
 DefNewGeneration::DefNewGeneration(ReservedSpace rs,
                                    size_t initial_size,
-                                   int level,
                                    const char* policy)
-  : Generation(rs, initial_size, level),
+  : Generation(rs, initial_size),
     _promo_failure_drain_in_progress(false),
     _should_allocate_from_space(false)
 {
@@ -382,13 +374,9 @@
     return;
   }
 
-  int next_level = level() + 1;
   GenCollectedHeap* gch = GenCollectedHeap::heap();
-  assert(next_level < gch->n_gens(),
-         "DefNewGeneration cannot be an oldest gen");
 
-  Generation* old_gen = gch->old_gen();
-  size_t old_size = old_gen->capacity();
+  size_t old_size = gch->old_gen()->capacity();
   size_t new_size_before = _virtual_space.committed_size();
   size_t min_new_size = spec()->init_size();
   size_t max_new_size = reserved().byte_size();
@@ -605,7 +593,7 @@
 
   gch->rem_set()->prepare_for_younger_refs_iterate(false);
 
-  assert(gch->no_allocs_since_save_marks(0),
+  assert(gch->no_allocs_since_save_marks(Generation::Young),
          "save marks have not been newly set.");
 
   // Not very pretty.
@@ -621,14 +609,14 @@
                                            false);
 
   set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier);
-  FastEvacuateFollowersClosure evacuate_followers(gch, _level, this,
+  FastEvacuateFollowersClosure evacuate_followers(gch, this,
                                                   &fsc_with_no_gc_barrier,
                                                   &fsc_with_gc_barrier);
 
-  assert(gch->no_allocs_since_save_marks(0),
+  assert(gch->no_allocs_since_save_marks(Generation::Young),
          "save marks have not been newly set.");
 
-  gch->gen_process_roots(_level,
+  gch->gen_process_roots(Generation::Young,
                          true,  // Process younger gens, if any,
                                 // as strong roots.
                          true,  // activate StrongRootsScope
@@ -867,7 +855,7 @@
 void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor,
                                          size_t max_alloc_words) {
   if (requestor == this || _promotion_failed) return;
-  assert(requestor->level() > level(), "DefNewGeneration must be youngest");
+  assert(requestor == GenCollectedHeap::heap()->old_gen(), "We should not call our own generation");
 
   /* $$$ Assert this?  "trace" is a "MarkSweep" function so that's not appropriate.
   if (to_space->top() > to_space->bottom()) {