--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp	Wed Dec 10 11:32:22 2014 +0100
@@ -793,11 +793,6 @@
   }
 }
 
-CompactibleSpace*
-ConcurrentMarkSweepGeneration::first_compaction_space() const {
-  return _cmsSpace;
-}
-
 void ConcurrentMarkSweepGeneration::reset_after_compaction() {
   // Clear the promotion information.  These pointers can be adjusted
   // along with all the other pointers into the heap but
@@ -808,10 +803,6 @@
   }
 }
 
-void ConcurrentMarkSweepGeneration::space_iterate(SpaceClosure* blk, bool usedOnly) {
-  blk->do_space(_cmsSpace);
-}
-
 void ConcurrentMarkSweepGeneration::compute_new_size() {
   assert_locked_or_safepoint(Heap_lock);
 
@@ -882,7 +873,7 @@
         expand_bytes);
     }
     // safe if expansion fails
-    expand(expand_bytes, 0, CMSExpansionCause::_satisfy_free_ratio);
+    expand_for_gc_cause(expand_bytes, 0, CMSExpansionCause::_satisfy_free_ratio);
     if (PrintGCDetails && Verbose) {
       gclog_or_tty->print_cr("  Expanded free fraction %f",
         ((double) free()) / capacity());
@@ -1048,8 +1039,7 @@
   if (res == NULL) {
     // expand and retry
     size_t s = _cmsSpace->expansionSpaceRequired(obj_size);  // HeapWords
-    expand(s*HeapWordSize, MinHeapDeltaBytes,
-      CMSExpansionCause::_satisfy_promotion);
+    expand_for_gc_cause(s*HeapWordSize, MinHeapDeltaBytes, CMSExpansionCause::_satisfy_promotion);
     // Since there's currently no next generation, we don't try to promote
     // into a more senior generation.
     assert(next_gen() == NULL, "assumption, based upon which no attempt "
@@ -2625,13 +2615,6 @@
 ALL_SINCE_SAVE_MARKS_CLOSURES(CMS_SINCE_SAVE_MARKS_DEFN)
 
 void
-ConcurrentMarkSweepGeneration::younger_refs_iterate(OopsInGenClosure* cl) {
-  cl->set_generation(this);
-  younger_refs_in_space_iterate(_cmsSpace, cl);
-  cl->reset_generation();
-}
-
-void
 ConcurrentMarkSweepGeneration::oop_iterate(ExtendedOopClosure* cl) {
   if (freelistLock()->owned_by_self()) {
     Generation::oop_iterate(cl);
@@ -2803,23 +2786,17 @@
   CMSSynchronousYieldRequest yr;
   assert(!tlab, "Can't deal with TLAB allocation");
   MutexLockerEx x(freelistLock(), Mutex::_no_safepoint_check_flag);
-  expand(word_size*HeapWordSize, MinHeapDeltaBytes,
-    CMSExpansionCause::_satisfy_allocation);
+  expand_for_gc_cause(word_size*HeapWordSize, MinHeapDeltaBytes, CMSExpansionCause::_satisfy_allocation);
   if (GCExpandToAllocateDelayMillis > 0) {
     os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false);
   }
   return have_lock_and_allocate(word_size, tlab);
 }
 
-// YSR: All of this generation expansion/shrinking stuff is an exact copy of
-// TenuredGeneration, which makes me wonder if we should move this
-// to CardGeneration and share it...
-bool ConcurrentMarkSweepGeneration::expand(size_t bytes, size_t expand_bytes) {
-  return CardGeneration::expand(bytes, expand_bytes);
-}
-
-void ConcurrentMarkSweepGeneration::expand(size_t bytes, size_t expand_bytes,
-  CMSExpansionCause::Cause cause)
+void ConcurrentMarkSweepGeneration::expand_for_gc_cause(
+    size_t bytes,
+    size_t expand_bytes,
+    CMSExpansionCause::Cause cause)
 {
 
   bool success = expand(bytes, expand_bytes);
@@ -2848,8 +2825,7 @@
       return NULL;
     }
     // Otherwise, we try expansion.
-    expand(word_sz*HeapWordSize, MinHeapDeltaBytes,
-      CMSExpansionCause::_allocate_par_lab);
+    expand_for_gc_cause(word_sz*HeapWordSize, MinHeapDeltaBytes, CMSExpansionCause::_allocate_par_lab);
     // Now go around the loop and try alloc again;
     // A competing par_promote might beat us to the expansion space,
     // so we may go around the loop again if promotion fails again.
@@ -2876,8 +2852,7 @@
       return false;
     }
     // Otherwise, we try expansion.
-    expand(refill_size_bytes, MinHeapDeltaBytes,
-      CMSExpansionCause::_allocate_par_spooling_space);
+    expand_for_gc_cause(refill_size_bytes, MinHeapDeltaBytes, CMSExpansionCause::_allocate_par_spooling_space);
     // Now go around the loop and try alloc again;
     // A competing allocation might beat us to the expansion space,
     // so we may go around the loop again if allocation fails again.
@@ -2887,77 +2862,16 @@
   }
 }
 
-
-void ConcurrentMarkSweepGeneration::shrink_by(size_t bytes) {
-  assert_locked_or_safepoint(ExpandHeap_lock);
-  // Shrink committed space
-  _virtual_space.shrink_by(bytes);
-  // Shrink space; this also shrinks the space's BOT
-  _cmsSpace->set_end((HeapWord*) _virtual_space.high());
-  size_t new_word_size = heap_word_size(_cmsSpace->capacity());
-  // Shrink the shared block offset array
-  _bts->resize(new_word_size);
-  MemRegion mr(_cmsSpace->bottom(), new_word_size);
-  // Shrink the card table
-  Universe::heap()->barrier_set()->resize_covered_region(mr);
-
-  if (Verbose && PrintGC) {
-    size_t new_mem_size = _virtual_space.committed_size();
-    size_t old_mem_size = new_mem_size + bytes;
-    gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K",
-                  name(), old_mem_size/K, new_mem_size/K);
-  }
-}
-
 void ConcurrentMarkSweepGeneration::shrink(size_t bytes) {
-  assert_locked_or_safepoint(Heap_lock);
-  size_t size = ReservedSpace::page_align_size_down(bytes);
   // Only shrink if a compaction was done so that all the free space
   // in the generation is in a contiguous block at the end.
-  if (size > 0 && did_compact()) {
-    shrink_by(size);
-  }
-}
-
-bool ConcurrentMarkSweepGeneration::grow_by(size_t bytes) {
+  if (did_compact()) {
+    CardGeneration::shrink(bytes);
+  }
+}
+
+void ConcurrentMarkSweepGeneration::assert_correct_size_change_locking() {
   assert_locked_or_safepoint(Heap_lock);
-  bool result = _virtual_space.expand_by(bytes);
-  if (result) {
-    size_t new_word_size =
-      heap_word_size(_virtual_space.committed_size());
-    MemRegion mr(_cmsSpace->bottom(), new_word_size);
-    _bts->resize(new_word_size);  // resize the block offset shared array
-    Universe::heap()->barrier_set()->resize_covered_region(mr);
-    // Hmmmm... why doesn't CFLS::set_end verify locking?
-    // This is quite ugly; FIX ME XXX
-    _cmsSpace->assert_locked(freelistLock());
-    _cmsSpace->set_end((HeapWord*)_virtual_space.high());
-
-    // update the space and generation capacity counters
-    if (UsePerfData) {
-      _space_counters->update_capacity();
-      _gen_counters->update_all();
-    }
-
-    if (Verbose && PrintGC) {
-      size_t new_mem_size = _virtual_space.committed_size();
-      size_t old_mem_size = new_mem_size - bytes;
-      gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " SIZE_FORMAT "K to " SIZE_FORMAT "K",
-                    name(), old_mem_size/K, bytes/K, new_mem_size/K);
-    }
-  }
-  return result;
-}
-
-bool ConcurrentMarkSweepGeneration::grow_to_reserved() {
-  assert_locked_or_safepoint(Heap_lock);
-  bool success = true;
-  const size_t remaining_bytes = _virtual_space.uncommitted_size();
-  if (remaining_bytes > 0) {
-    success = grow_by(remaining_bytes);
-    DEBUG_ONLY(if (!success) warning("grow to reserved failed");)
-  }
-  return success;
 }
 
 void ConcurrentMarkSweepGeneration::shrink_free_list_by(size_t bytes) {

--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp	Wed Dec 10 11:32:22 2014 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * 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
@@ -33,6 +33,7 @@
 #include "memory/cardGeneration.hpp"
 #include "memory/freeBlockDictionary.hpp"
 #include "memory/iterator.hpp"
+#include "memory/space.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/virtualspace.hpp"
 #include "services/memoryService.hpp"
@@ -171,9 +172,7 @@
 // Represents a marking stack used by the CMS collector.
 // Ideally this should be GrowableArray<> just like MSC's marking stack(s).
 class CMSMarkStack: public CHeapObj<mtGC>  {
-  //
   friend class CMSCollector;   // To get at expansion stats further below.
-  //
 
   VirtualSpace _virtual_space;  // Space for the stack
   oop*   _base;      // Bottom of stack
@@ -1031,6 +1030,9 @@
   void set_expansion_cause(CMSExpansionCause::Cause v) { _expansion_cause = v;}
   CMSExpansionCause::Cause expansion_cause() const { return _expansion_cause; }
 
+  // Accessing spaces
+  CompactibleSpace* space() const { return (CompactibleSpace*)_cmsSpace; }
+
  private:
   // For parallel young-gen GC support.
   CMSParGCThreadState** _par_gc_thread_states;
@@ -1064,6 +1066,10 @@
   double initiating_occupancy() const { return _initiating_occupancy; }
   void   init_initiating_occupancy(intx io, uintx tr);
 
+  void expand_for_gc_cause(size_t bytes, size_t expand_bytes, CMSExpansionCause::Cause cause);
+
+  void assert_correct_size_change_locking();
+
  public:
   ConcurrentMarkSweepGeneration(ReservedSpace rs, size_t initial_byte_size,
                                 int level, CardTableRS* ct,
@@ -1100,23 +1106,14 @@
   // Override
   virtual void ref_processor_init();
 
-  // Grow generation by specified size (returns false if unable to grow)
-  bool grow_by(size_t bytes);
-  // Grow generation to reserved size.
-  bool grow_to_reserved();
-
   void clear_expansion_cause() { _expansion_cause = CMSExpansionCause::_no_expansion; }
 
   // Space enquiries
-  size_t capacity() const;
-  size_t used() const;
-  size_t free() const;
   double occupancy() const { return ((double)used())/((double)capacity()); }
   size_t contiguous_available() const;
   size_t unsafe_max_alloc_nogc() const;
 
   // over-rides
-  MemRegion used_region() const;
   MemRegion used_region_at_save_marks() const;
 
   // Does a "full" (forced) collection invoked on this generation collect
@@ -1127,10 +1124,6 @@
     return !ScavengeBeforeFullGC;
   }
 
-  void space_iterate(SpaceClosure* blk, bool usedOnly = false);
-
-  // Support for compaction
-  CompactibleSpace* first_compaction_space() const;
   // Adjust quantities in the generation affected by
   // the compaction.
   void reset_after_compaction();
@@ -1190,18 +1183,13 @@
   }
 
   // Allocation failure
-  void expand(size_t bytes, size_t expand_bytes,
-    CMSExpansionCause::Cause cause);
-  virtual bool expand(size_t bytes, size_t expand_bytes);
   void shrink(size_t bytes);
-  void shrink_by(size_t bytes);
   HeapWord* expand_and_par_lab_allocate(CMSParGCThreadState* ps, size_t word_sz);
   bool expand_and_ensure_spooling_space(PromotionInfo* promo);
 
   // Iteration support and related enquiries
   void save_marks();
   bool no_allocs_since_save_marks();
-  void younger_refs_iterate(OopsInGenClosure* cl);
 
   // Iteration support specific to CMS generations
   void save_sweep_limit();

--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp	Wed Dec 10 11:32:22 2014 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
+ * 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
@@ -369,22 +369,6 @@
   cmsSpace()->save_sweep_limit();
 }
 
-inline size_t ConcurrentMarkSweepGeneration::capacity() const {
-  return _cmsSpace->capacity();
-}
-
-inline size_t ConcurrentMarkSweepGeneration::used() const {
-  return _cmsSpace->used();
-}
-
-inline size_t ConcurrentMarkSweepGeneration::free() const {
-  return _cmsSpace->free();
-}
-
-inline MemRegion ConcurrentMarkSweepGeneration::used_region() const {
-  return _cmsSpace->used_region();
-}
-
 inline MemRegion ConcurrentMarkSweepGeneration::used_region_at_save_marks() const {
   return _cmsSpace->used_region_at_save_marks();
 }

--- a/hotspot/src/share/vm/memory/cardGeneration.cpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/memory/cardGeneration.cpp	Wed Dec 10 11:32:22 2014 +0100
@@ -23,7 +23,9 @@
  */
 
 #include "precompiled.hpp"
+
 #include "memory/blockOffsetTable.inline.hpp"
+#include "memory/cardGeneration.inline.hpp"
 #include "memory/gcLocker.hpp"
 #include "memory/generationSpec.hpp"
 #include "memory/genOopClosures.inline.hpp"
@@ -49,8 +51,9 @@
                                     heap_word_size(initial_byte_size));
   MemRegion committed_mr(start, heap_word_size(initial_byte_size));
   _rs->resize_covered_region(committed_mr);
-  if (_bts == NULL)
+  if (_bts == NULL) {
     vm_exit_during_initialization("Could not allocate a BlockOffsetArray");
+  }
 
   // Verify that the start and end of this generation is the start of a card.
   // If this wasn't true, a single card could span more than on generation,
@@ -67,6 +70,43 @@
   _used_at_prologue = 0;
 }
 
+bool CardGeneration::grow_by(size_t bytes) {
+  assert_correct_size_change_locking();
+  bool result = _virtual_space.expand_by(bytes);
+  if (result) {
+    size_t new_word_size =
+       heap_word_size(_virtual_space.committed_size());
+    MemRegion mr(space()->bottom(), new_word_size);
+    // Expand card table
+    Universe::heap()->barrier_set()->resize_covered_region(mr);
+    // Expand shared block offset array
+    _bts->resize(new_word_size);
+
+    // Fix for bug #4668531
+    if (ZapUnusedHeapArea) {
+      MemRegion mangle_region(space()->end(),
+      (HeapWord*)_virtual_space.high());
+      SpaceMangler::mangle_region(mangle_region);
+    }
+
+    // Expand space -- also expands space's BOT
+    // (which uses (part of) shared array above)
+    space()->set_end((HeapWord*)_virtual_space.high());
+
+    // update the space and generation capacity counters
+    update_counters();
+
+    if (Verbose && PrintGC) {
+      size_t new_mem_size = _virtual_space.committed_size();
+      size_t old_mem_size = new_mem_size - bytes;
+      gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by "
+                      SIZE_FORMAT "K to " SIZE_FORMAT "K",
+                      name(), old_mem_size/K, bytes/K, new_mem_size/K);
+    }
+  }
+  return result;
+}
+
 bool CardGeneration::expand(size_t bytes, size_t expand_bytes) {
   assert_locked_or_safepoint(Heap_lock);
   if (bytes == 0) {
@@ -102,6 +142,44 @@
   return success;
 }
 
+bool CardGeneration::grow_to_reserved() {
+  assert_correct_size_change_locking();
+  bool success = true;
+  const size_t remaining_bytes = _virtual_space.uncommitted_size();
+  if (remaining_bytes > 0) {
+    success = grow_by(remaining_bytes);
+    DEBUG_ONLY(if (!success) warning("grow to reserved failed");)
+  }
+  return success;
+}
+
+void CardGeneration::shrink(size_t bytes) {
+  assert_correct_size_change_locking();
+
+  size_t size = ReservedSpace::page_align_size_down(bytes);
+  if (size == 0) {
+    return;
+  }
+
+  // Shrink committed space
+  _virtual_space.shrink_by(size);
+  // Shrink space; this also shrinks the space's BOT
+  space()->set_end((HeapWord*) _virtual_space.high());
+  size_t new_word_size = heap_word_size(space()->capacity());
+  // Shrink the shared block offset array
+  _bts->resize(new_word_size);
+  MemRegion mr(space()->bottom(), new_word_size);
+  // Shrink the card table
+  Universe::heap()->barrier_set()->resize_covered_region(mr);
+
+  if (Verbose && PrintGC) {
+    size_t new_mem_size = _virtual_space.committed_size();
+    size_t old_mem_size = new_mem_size + size;
+    gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K",
+                  name(), old_mem_size/K, new_mem_size/K);
+  }
+}
+
 // No young generation references, clear this generation's cards.
 void CardGeneration::clear_remembered_set() {
   _rs->clear(reserved());
@@ -269,3 +347,14 @@
 
 // Currently nothing to do.
 void CardGeneration::prepare_for_verify() {}
+
+void CardGeneration::space_iterate(SpaceClosure* blk,
+                                                 bool usedOnly) {
+  blk->do_space(space());
+}
+
+void CardGeneration::younger_refs_iterate(OopsInGenClosure* blk) {
+  blk->set_generation(this);
+  younger_refs_in_space_iterate(space(), blk);
+  blk->reset_generation();
+}

--- a/hotspot/src/share/vm/memory/cardGeneration.hpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/memory/cardGeneration.hpp	Wed Dec 10 11:32:22 2014 +0100
@@ -31,6 +31,7 @@
 #include "memory/generation.hpp"
 
 class BlockOffsetSharedArray;
+class CompactibleSpace;
 
 class CardGeneration: public Generation {
   friend class VMStructs;
@@ -40,7 +41,7 @@
   // This is local to this generation.
   BlockOffsetSharedArray* _bts;
 
-  // current shrinking effect: this damps shrinking when the heap gets empty.
+  // Current shrinking effect: this damps shrinking when the heap gets empty.
   size_t _shrink_factor;
 
   size_t _min_heap_delta_bytes;   // Minimum amount to expand.
@@ -54,6 +55,10 @@
   CardGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
                  GenRemSet* remset);
 
+  virtual void assert_correct_size_change_locking() = 0;
+
+  virtual CompactibleSpace* space() const = 0;
+
  public:
 
   // Attempt to expand the generation by "bytes".  Expand by at a
@@ -62,7 +67,7 @@
   virtual bool expand(size_t bytes, size_t expand_bytes);
 
   // Shrink generation with specified size
-  virtual void shrink(size_t bytes) = 0;
+  virtual void shrink(size_t bytes);
 
   virtual void compute_new_size();
 
@@ -73,9 +78,22 @@
   virtual void prepare_for_verify();
 
   // Grow generation with specified size (returns false if unable to grow)
-  virtual bool grow_by(size_t bytes) = 0;
+  bool grow_by(size_t bytes);
   // Grow generation to reserved size.
-  virtual bool grow_to_reserved() = 0;
+  bool grow_to_reserved();
+
+  size_t capacity() const;
+  size_t used() const;
+  size_t free() const;
+  MemRegion used_region() const;
+
+  void space_iterate(SpaceClosure* blk, bool usedOnly = false);
+
+  void younger_refs_iterate(OopsInGenClosure* blk);
+
+  bool is_in(const void* p) const;
+
+  CompactibleSpace* first_compaction_space() const;
 };
 
 #endif // SHARE_VM_MEMORY_CARDGENERATION_HPP

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/memory/cardGeneration.inline.hpp	Wed Dec 10 11:32:22 2014 +0100
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_MEMORY_CARDGENERATION_INLINE_HPP
+#define SHARE_VM_MEMORY_CARDGENERATION_INLINE_HPP
+
+#include "memory/cardGeneration.hpp"
+#include "memory/space.hpp"
+
+inline size_t CardGeneration::capacity() const {
+  return space()->capacity();
+}
+
+inline size_t CardGeneration::used() const {
+  return space()->used();
+}
+
+inline size_t CardGeneration::free() const {
+  return space()->free();
+}
+
+inline MemRegion CardGeneration::used_region() const {
+  return space()->used_region();
+}
+
+inline bool CardGeneration::is_in(const void* p) const {
+  return space()->is_in(p);
+}
+
+inline CompactibleSpace* CardGeneration::first_compaction_space() const {
+  return space();
+}
+
+#endif // SHARE_VM_MEMORY_CARDGENERATION_INLINE_HPP

--- a/hotspot/src/share/vm/memory/tenuredGeneration.cpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/memory/tenuredGeneration.cpp	Wed Dec 10 11:32:22 2014 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * 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
@@ -235,34 +235,6 @@
   return CardGeneration::expand(bytes, expand_bytes);
 }
 
-
-void TenuredGeneration::shrink(size_t bytes) {
-  assert_locked_or_safepoint(ExpandHeap_lock);
-  size_t size = ReservedSpace::page_align_size_down(bytes);
-  if (size > 0) {
-    shrink_by(size);
-  }
-}
-
-
-size_t TenuredGeneration::capacity() const {
-  return _the_space->capacity();
-}
-
-
-size_t TenuredGeneration::used() const {
-  return _the_space->used();
-}
-
-
-size_t TenuredGeneration::free() const {
-  return _the_space->free();
-}
-
-MemRegion TenuredGeneration::used_region() const {
-  return the_space()->used_region();
-}
-
 size_t TenuredGeneration::unsafe_max_alloc_nogc() const {
   return _the_space->free();
 }
@@ -271,74 +243,8 @@
   return _the_space->free() + _virtual_space.uncommitted_size();
 }
 
-bool TenuredGeneration::grow_by(size_t bytes) {
+void TenuredGeneration::assert_correct_size_change_locking() {
   assert_locked_or_safepoint(ExpandHeap_lock);
-  bool result = _virtual_space.expand_by(bytes);
-  if (result) {
-    size_t new_word_size =
-       heap_word_size(_virtual_space.committed_size());
-    MemRegion mr(_the_space->bottom(), new_word_size);
-    // Expand card table
-    Universe::heap()->barrier_set()->resize_covered_region(mr);
-    // Expand shared block offset array
-    _bts->resize(new_word_size);
-
-    // Fix for bug #4668531
-    if (ZapUnusedHeapArea) {
-      MemRegion mangle_region(_the_space->end(),
-      (HeapWord*)_virtual_space.high());
-      SpaceMangler::mangle_region(mangle_region);
-    }
-
-    // Expand space -- also expands space's BOT
-    // (which uses (part of) shared array above)
-    _the_space->set_end((HeapWord*)_virtual_space.high());
-
-    // update the space and generation capacity counters
-    update_counters();
-
-    if (Verbose && PrintGC) {
-      size_t new_mem_size = _virtual_space.committed_size();
-      size_t old_mem_size = new_mem_size - bytes;
-      gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by "
-                      SIZE_FORMAT "K to " SIZE_FORMAT "K",
-                      name(), old_mem_size/K, bytes/K, new_mem_size/K);
-    }
-  }
-  return result;
-}
-
-
-bool TenuredGeneration::grow_to_reserved() {
-  assert_locked_or_safepoint(ExpandHeap_lock);
-  bool success = true;
-  const size_t remaining_bytes = _virtual_space.uncommitted_size();
-  if (remaining_bytes > 0) {
-    success = grow_by(remaining_bytes);
-    DEBUG_ONLY(if (!success) warning("grow to reserved failed");)
-  }
-  return success;
-}
-
-void TenuredGeneration::shrink_by(size_t bytes) {
-  assert_locked_or_safepoint(ExpandHeap_lock);
-  // Shrink committed space
-  _virtual_space.shrink_by(bytes);
-  // Shrink space; this also shrinks the space's BOT
-  _the_space->set_end((HeapWord*) _virtual_space.high());
-  size_t new_word_size = heap_word_size(_the_space->capacity());
-  // Shrink the shared block offset array
-  _bts->resize(new_word_size);
-  MemRegion mr(_the_space->bottom(), new_word_size);
-  // Shrink the card table
-  Universe::heap()->barrier_set()->resize_covered_region(mr);
-
-  if (Verbose && PrintGC) {
-    size_t new_mem_size = _virtual_space.committed_size();
-    size_t old_mem_size = new_mem_size + bytes;
-    gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K",
-                  name(), old_mem_size/K, new_mem_size/K);
-  }
 }
 
 // Currently nothing to do.
@@ -348,27 +254,14 @@
   _the_space->object_iterate(blk);
 }
 
-void TenuredGeneration::space_iterate(SpaceClosure* blk,
-                                                 bool usedOnly) {
-  blk->do_space(_the_space);
-}
-
-void TenuredGeneration::younger_refs_iterate(OopsInGenClosure* blk) {
-  blk->set_generation(this);
-  younger_refs_in_space_iterate(_the_space, blk);
-  blk->reset_generation();
-}
-
 void TenuredGeneration::save_marks() {
   _the_space->set_saved_mark();
 }
 
-
 void TenuredGeneration::reset_saved_marks() {
   _the_space->reset_saved_mark();
 }
 
-
 bool TenuredGeneration::no_allocs_since_save_marks() {
   return _the_space->saved_mark_at_top();
 }
@@ -387,26 +280,25 @@
 
 #undef TenuredGen_SINCE_SAVE_MARKS_ITERATE_DEFN
 
-
 void TenuredGeneration::gc_epilogue(bool full) {
   // update the generation and space performance counters
   update_counters();
   if (ZapUnusedHeapArea) {
-    the_space()->check_mangled_unused_area_complete();
+    _the_space->check_mangled_unused_area_complete();
   }
 }
 
 void TenuredGeneration::record_spaces_top() {
   assert(ZapUnusedHeapArea, "Not mangling unused space");
-  the_space()->set_top_for_allocations();
+  _the_space->set_top_for_allocations();
 }
 
 void TenuredGeneration::verify() {
-  the_space()->verify();
+  _the_space->verify();
 }
 
 void TenuredGeneration::print_on(outputStream* st)  const {
   Generation::print_on(st);
   st->print("   the");
-  the_space()->print_on(st);
+  _the_space->print_on(st);
 }

--- a/hotspot/src/share/vm/memory/tenuredGeneration.hpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/memory/tenuredGeneration.hpp	Wed Dec 10 11:32:22 2014 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * 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
@@ -42,25 +42,18 @@
   friend class VM_PopulateDumpSharedSpace;
 
  protected:
-  ContiguousSpace*  _the_space;       // actual space holding objects
+  ContiguousSpace*  _the_space;       // Actual space holding objects
 
   GenerationCounters*   _gen_counters;
   CSpaceCounters*       _space_counters;
 
-  // Grow generation with specified size (returns false if unable to grow)
-  virtual bool grow_by(size_t bytes);
-  // Grow generation to reserved size.
-  virtual bool grow_to_reserved();
-  // Shrink generation with specified size (returns false if unable to shrink)
-  void shrink_by(size_t bytes);
-
   // Allocation failure
   virtual bool expand(size_t bytes, size_t expand_bytes);
-  void shrink(size_t bytes);
 
   // Accessing spaces
-  ContiguousSpace* the_space() const { return _the_space; }
+  ContiguousSpace* space() const { return _the_space; }
 
+  void assert_correct_size_change_locking();
  public:
   TenuredGeneration(ReservedSpace rs, size_t initial_byte_size,
                                int level, GenRemSet* remset);
@@ -79,25 +72,11 @@
     return !ScavengeBeforeFullGC;
   }
 
-  inline bool is_in(const void* p) const;
-
-  // Space enquiries
-  size_t capacity() const;
-  size_t used() const;
-  size_t free() const;
-
-  MemRegion used_region() const;
-
   size_t unsafe_max_alloc_nogc() const;
   size_t contiguous_available() const;
 
   // Iteration
   void object_iterate(ObjectClosure* blk);
-  void space_iterate(SpaceClosure* blk, bool usedOnly = false);
-
-  void younger_refs_iterate(OopsInGenClosure* blk);
-
-  inline CompactibleSpace* first_compaction_space() const;
 
   virtual inline HeapWord* allocate(size_t word_size, bool is_tlab);
   virtual inline HeapWord* par_allocate(size_t word_size, bool is_tlab);

--- a/hotspot/src/share/vm/memory/tenuredGeneration.inline.hpp	Wed Dec 10 11:31:43 2014 +0100
+++ b/hotspot/src/share/vm/memory/tenuredGeneration.inline.hpp	Wed Dec 10 11:32:22 2014 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -25,41 +25,32 @@
 #ifndef SHARE_VM_MEMORY_TENUREDGENERATION_INLINE_HPP
 #define SHARE_VM_MEMORY_TENUREDGENERATION_INLINE_HPP
 
-#include "memory/genCollectedHeap.hpp"
 #include "memory/space.hpp"
 #include "memory/tenuredGeneration.hpp"
 
-bool TenuredGeneration::is_in(const void* p) const {
-  return the_space()->is_in(p);
-}
-
-CompactibleSpace*
-TenuredGeneration::first_compaction_space() const {
-  return the_space();
-}
-
 HeapWord* TenuredGeneration::allocate(size_t word_size,
                                                  bool is_tlab) {
   assert(!is_tlab, "TenuredGeneration does not support TLAB allocation");
-  return the_space()->allocate(word_size);
+  return _the_space->allocate(word_size);
 }
 
 HeapWord* TenuredGeneration::par_allocate(size_t word_size,
                                                      bool is_tlab) {
   assert(!is_tlab, "TenuredGeneration does not support TLAB allocation");
-  return the_space()->par_allocate(word_size);
+  return _the_space->par_allocate(word_size);
 }
 
 size_t TenuredGeneration::block_size(const HeapWord* addr) const {
-  if (addr < the_space()->top()) return oop(addr)->size();
-  else {
-    assert(addr == the_space()->top(), "non-block head arg to block_size");
-    return the_space()->end() - the_space()->top();
+  if (addr < _the_space->top()) {
+    return oop(addr)->size();
+  } else {
+    assert(addr == _the_space->top(), "non-block head arg to block_size");
+    return _the_space->end() - _the_space->top();
   }
 }
 
 bool TenuredGeneration::block_is_obj(const HeapWord* addr) const {
-  return addr < the_space()->top();
+  return addr < _the_space  ->top();
 }
 
 #endif // SHARE_VM_MEMORY_TENUREDGENERATION_INLINE_HPP