--- old/src/share/vm/memory/space.inline.hpp	2015-05-12 11:57:43.152018925 +0200
+++ /dev/null	2015-03-18 17:10:38.111854831 +0100
@@ -1,334 +0,0 @@
-/*
- * Copyright (c) 2000, 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.
- *
- * 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_SPACE_INLINE_HPP
-#define SHARE_VM_MEMORY_SPACE_INLINE_HPP
-
-#include "gc_implementation/shared/liveRange.hpp"
-#include "gc_implementation/shared/markSweep.inline.hpp"
-#include "gc_implementation/shared/spaceDecorator.hpp"
-#include "gc_interface/collectedHeap.hpp"
-#include "memory/generation.hpp"
-#include "memory/space.hpp"
-#include "memory/universe.hpp"
-#include "runtime/prefetch.inline.hpp"
-#include "runtime/safepoint.hpp"
-
-inline HeapWord* Space::block_start(const void* p) {
-  return block_start_const(p);
-}
-
-inline HeapWord* OffsetTableContigSpace::allocate(size_t size) {
-  HeapWord* res = ContiguousSpace::allocate(size);
-  if (res != NULL) {
-    _offsets.alloc_block(res, size);
-  }
-  return res;
-}
-
-// Because of the requirement of keeping "_offsets" up to date with the
-// allocations, we sequentialize these with a lock.  Therefore, best if
-// this is used for larger LAB allocations only.
-inline HeapWord* OffsetTableContigSpace::par_allocate(size_t size) {
-  MutexLocker x(&_par_alloc_lock);
-  // This ought to be just "allocate", because of the lock above, but that
-  // ContiguousSpace::allocate asserts that either the allocating thread
-  // holds the heap lock or it is the VM thread and we're at a safepoint.
-  // The best I (dld) could figure was to put a field in ContiguousSpace
-  // meaning "locking at safepoint taken care of", and set/reset that
-  // here.  But this will do for now, especially in light of the comment
-  // above.  Perhaps in the future some lock-free manner of keeping the
-  // coordination.
-  HeapWord* res = ContiguousSpace::par_allocate(size);
-  if (res != NULL) {
-    _offsets.alloc_block(res, size);
-  }
-  return res;
-}
-
-inline HeapWord*
-OffsetTableContigSpace::block_start_const(const void* p) const {
-  return _offsets.block_start(p);
-}
-
-template <class SpaceType>
-inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* cp) {
-  // Compute the new addresses for the live objects and store it in the mark
-  // Used by universe::mark_sweep_phase2()
-  HeapWord* compact_top; // This is where we are currently compacting to.
-
-  // We're sure to be here before any objects are compacted into this
-  // space, so this is a good time to initialize this:
-  space->set_compaction_top(space->bottom());
-
-  if (cp->space == NULL) {
-    assert(cp->gen != NULL, "need a generation");
-    assert(cp->threshold == NULL, "just checking");
-    assert(cp->gen->first_compaction_space() == space, "just checking");
-    cp->space = cp->gen->first_compaction_space();
-    compact_top = cp->space->bottom();
-    cp->space->set_compaction_top(compact_top);
-    cp->threshold = cp->space->initialize_threshold();
-  } else {
-    compact_top = cp->space->compaction_top();
-  }
-
-  // We allow some amount of garbage towards the bottom of the space, so
-  // we don't start compacting before there is a significant gain to be made.
-  // Occasionally, we want to ensure a full compaction, which is determined
-  // by the MarkSweepAlwaysCompactCount parameter.
-  uint invocations = MarkSweep::total_invocations();
-  bool skip_dead = ((invocations % MarkSweepAlwaysCompactCount) != 0);
-
-  size_t allowed_deadspace = 0;
-  if (skip_dead) {
-    const size_t ratio = space->allowed_dead_ratio();
-    allowed_deadspace = (space->capacity() * ratio / 100) / HeapWordSize;
-  }
-
-  HeapWord* q = space->bottom();
-  HeapWord* t = space->scan_limit();
-
-  HeapWord*  end_of_live= q;            // One byte beyond the last byte of the last
-                                        // live object.
-  HeapWord*  first_dead = space->end(); // The first dead object.
-  LiveRange* liveRange  = NULL;         // The current live range, recorded in the
-                                        // first header of preceding free area.
-  space->_first_dead = first_dead;
-
-  const intx interval = PrefetchScanIntervalInBytes;
-
-  while (q < t) {
-    assert(!space->scanned_block_is_obj(q) ||
-           oop(q)->mark()->is_marked() || oop(q)->mark()->is_unlocked() ||
-           oop(q)->mark()->has_bias_pattern(),
-           "these are the only valid states during a mark sweep");
-    if (space->scanned_block_is_obj(q) && oop(q)->is_gc_marked()) {
-      // prefetch beyond q
-      Prefetch::write(q, interval);
-      size_t size = space->scanned_block_size(q);
-      compact_top = cp->space->forward(oop(q), size, cp, compact_top);
-      q += size;
-      end_of_live = q;
-    } else {
-      // run over all the contiguous dead objects
-      HeapWord* end = q;
-      do {
-        // prefetch beyond end
-        Prefetch::write(end, interval);
-        end += space->scanned_block_size(end);
-      } while (end < t && (!space->scanned_block_is_obj(end) || !oop(end)->is_gc_marked()));
-
-      // see if we might want to pretend this object is alive so that
-      // we don't have to compact quite as often.
-      if (allowed_deadspace > 0 && q == compact_top) {
-        size_t sz = pointer_delta(end, q);
-        if (space->insert_deadspace(allowed_deadspace, q, sz)) {
-          compact_top = cp->space->forward(oop(q), sz, cp, compact_top);
-          q = end;
-          end_of_live = end;
-          continue;
-        }
-      }
-
-      // otherwise, it really is a free region.
-
-      // for the previous LiveRange, record the end of the live objects.
-      if (liveRange) {
-        liveRange->set_end(q);
-      }
-
-      // record the current LiveRange object.
-      // liveRange->start() is overlaid on the mark word.
-      liveRange = (LiveRange*)q;
-      liveRange->set_start(end);
-      liveRange->set_end(end);
-
-      // see if this is the first dead region.
-      if (q < first_dead) {
-        first_dead = q;
-      }
-
-      // move on to the next object
-      q = end;
-    }
-  }
-
-  assert(q == t, "just checking");
-  if (liveRange != NULL) {
-    liveRange->set_end(q);
-  }
-  space->_end_of_live = end_of_live;
-  if (end_of_live < first_dead) {
-    first_dead = end_of_live;
-  }
-  space->_first_dead = first_dead;
-
-  // save the compaction_top of the compaction space.
-  cp->space->set_compaction_top(compact_top);
-}
-
-template <class SpaceType>
-inline void CompactibleSpace::scan_and_adjust_pointers(SpaceType* space) {
-  // adjust all the interior pointers to point at the new locations of objects
-  // Used by MarkSweep::mark_sweep_phase3()
-
-  HeapWord* q = space->bottom();
-  HeapWord* t = space->_end_of_live;  // Established by "prepare_for_compaction".
-
-  assert(space->_first_dead <= space->_end_of_live, "Stands to reason, no?");
-
-  if (q < t && space->_first_dead > q && !oop(q)->is_gc_marked()) {
-    // we have a chunk of the space which hasn't moved and we've
-    // reinitialized the mark word during the previous pass, so we can't
-    // use is_gc_marked for the traversal.
-    HeapWord* end = space->_first_dead;
-
-    while (q < end) {
-      // I originally tried to conjoin "block_start(q) == q" to the
-      // assertion below, but that doesn't work, because you can't
-      // accurately traverse previous objects to get to the current one
-      // after their pointers have been
-      // updated, until the actual compaction is done.  dld, 4/00
-      assert(space->block_is_obj(q), "should be at block boundaries, and should be looking at objs");
-
-      // point all the oops to the new location
-      size_t size = MarkSweep::adjust_pointers(oop(q));
-      size = space->adjust_obj_size(size);
-
-      q += size;
-    }
-
-    if (space->_first_dead == t) {
-      q = t;
-    } else {
-      // $$$ This is funky.  Using this to read the previously written
-      // LiveRange.  See also use below.
-      q = (HeapWord*)oop(space->_first_dead)->mark()->decode_pointer();
-    }
-  }
-
-  const intx interval = PrefetchScanIntervalInBytes;
-
-  debug_only(HeapWord* prev_q = NULL);
-  while (q < t) {
-    // prefetch beyond q
-    Prefetch::write(q, interval);
-    if (oop(q)->is_gc_marked()) {
-      // q is alive
-      // point all the oops to the new location
-      size_t size = MarkSweep::adjust_pointers(oop(q));
-      size = space->adjust_obj_size(size);
-      debug_only(prev_q = q);
-      q += size;
-    } else {
-      // q is not a live object, so its mark should point at the next
-      // live object
-      debug_only(prev_q = q);
-      q = (HeapWord*) oop(q)->mark()->decode_pointer();
-      assert(q > prev_q, "we should be moving forward through memory");
-    }
-  }
-
-  assert(q == t, "just checking");
-}
-
-template <class SpaceType>
-inline void CompactibleSpace::scan_and_compact(SpaceType* space) {
-  // Copy all live objects to their new location
-  // Used by MarkSweep::mark_sweep_phase4()
-
-  HeapWord*       q = space->bottom();
-  HeapWord* const t = space->_end_of_live;
-  debug_only(HeapWord* prev_q = NULL);
-
-  if (q < t && space->_first_dead > q && !oop(q)->is_gc_marked()) {
-    #ifdef ASSERT // Debug only
-      // we have a chunk of the space which hasn't moved and we've reinitialized
-      // the mark word during the previous pass, so we can't use is_gc_marked for
-      // the traversal.
-      HeapWord* const end = space->_first_dead;
-
-      while (q < end) {
-        size_t size = space->obj_size(q);
-        assert(!oop(q)->is_gc_marked(), "should be unmarked (special dense prefix handling)");
-        prev_q = q;
-        q += size;
-      }
-    #endif
-
-    if (space->_first_dead == t) {
-      q = t;
-    } else {
-      // $$$ Funky
-      q = (HeapWord*) oop(space->_first_dead)->mark()->decode_pointer();
-    }
-  }
-
-  const intx scan_interval = PrefetchScanIntervalInBytes;
-  const intx copy_interval = PrefetchCopyIntervalInBytes;
-  while (q < t) {
-    if (!oop(q)->is_gc_marked()) {
-      // mark is pointer to next marked oop
-      debug_only(prev_q = q);
-      q = (HeapWord*) oop(q)->mark()->decode_pointer();
-      assert(q > prev_q, "we should be moving forward through memory");
-    } else {
-      // prefetch beyond q
-      Prefetch::read(q, scan_interval);
-
-      // size and destination
-      size_t size = space->obj_size(q);
-      HeapWord* compaction_top = (HeapWord*)oop(q)->forwardee();
-
-      // prefetch beyond compaction_top
-      Prefetch::write(compaction_top, copy_interval);
-
-      // copy object and reinit its mark
-      assert(q != compaction_top, "everything in this pass should be moving");
-      Copy::aligned_conjoint_words(q, compaction_top, size);
-      oop(compaction_top)->init_mark();
-      assert(oop(compaction_top)->klass() != NULL, "should have a class");
-
-      debug_only(prev_q = q);
-      q += size;
-    }
-  }
-
-  // Let's remember if we were empty before we did the compaction.
-  bool was_empty = space->used_region().is_empty();
-  // Reset space after compaction is complete
-  space->reset_after_compaction();
-  // We do this clear, below, since it has overloaded meanings for some
-  // space subtypes.  For example, OffsetTableContigSpace's that were
-  // compacted into will have had their offset table thresholds updated
-  // continuously, but those that weren't need to have their thresholds
-  // re-initialized.  Also mangles unused area for debugging.
-  if (space->used_region().is_empty()) {
-    if (!was_empty) space->clear(SpaceDecorator::Mangle);
-  } else {
-    if (ZapUnusedHeapArea) space->mangle_unused_area();
-  }
-}
-#endif // SHARE_VM_MEMORY_SPACE_INLINE_HPP
--- /dev/null	2015-03-18 17:10:38.111854831 +0100
+++ new/src/share/vm/gc/shared/space.inline.hpp	2015-05-12 11:57:42.965011045 +0200
@@ -0,0 +1,334 @@
+/*
+ * Copyright (c) 2000, 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.
+ *
+ * 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_GC_SHARED_SPACE_INLINE_HPP
+#define SHARE_VM_GC_SHARED_SPACE_INLINE_HPP
+
+#include "gc/serial/markSweep.inline.hpp"
+#include "gc/shared/collectedHeap.hpp"
+#include "gc/shared/generation.hpp"
+#include "gc/shared/liveRange.hpp"
+#include "gc/shared/space.hpp"
+#include "gc/shared/spaceDecorator.hpp"
+#include "memory/universe.hpp"
+#include "runtime/prefetch.inline.hpp"
+#include "runtime/safepoint.hpp"
+
+inline HeapWord* Space::block_start(const void* p) {
+  return block_start_const(p);
+}
+
+inline HeapWord* OffsetTableContigSpace::allocate(size_t size) {
+  HeapWord* res = ContiguousSpace::allocate(size);
+  if (res != NULL) {
+    _offsets.alloc_block(res, size);
+  }
+  return res;
+}
+
+// Because of the requirement of keeping "_offsets" up to date with the
+// allocations, we sequentialize these with a lock.  Therefore, best if
+// this is used for larger LAB allocations only.
+inline HeapWord* OffsetTableContigSpace::par_allocate(size_t size) {
+  MutexLocker x(&_par_alloc_lock);
+  // This ought to be just "allocate", because of the lock above, but that
+  // ContiguousSpace::allocate asserts that either the allocating thread
+  // holds the heap lock or it is the VM thread and we're at a safepoint.
+  // The best I (dld) could figure was to put a field in ContiguousSpace
+  // meaning "locking at safepoint taken care of", and set/reset that
+  // here.  But this will do for now, especially in light of the comment
+  // above.  Perhaps in the future some lock-free manner of keeping the
+  // coordination.
+  HeapWord* res = ContiguousSpace::par_allocate(size);
+  if (res != NULL) {
+    _offsets.alloc_block(res, size);
+  }
+  return res;
+}
+
+inline HeapWord*
+OffsetTableContigSpace::block_start_const(const void* p) const {
+  return _offsets.block_start(p);
+}
+
+template <class SpaceType>
+inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* cp) {
+  // Compute the new addresses for the live objects and store it in the mark
+  // Used by universe::mark_sweep_phase2()
+  HeapWord* compact_top; // This is where we are currently compacting to.
+
+  // We're sure to be here before any objects are compacted into this
+  // space, so this is a good time to initialize this:
+  space->set_compaction_top(space->bottom());
+
+  if (cp->space == NULL) {
+    assert(cp->gen != NULL, "need a generation");
+    assert(cp->threshold == NULL, "just checking");
+    assert(cp->gen->first_compaction_space() == space, "just checking");
+    cp->space = cp->gen->first_compaction_space();
+    compact_top = cp->space->bottom();
+    cp->space->set_compaction_top(compact_top);
+    cp->threshold = cp->space->initialize_threshold();
+  } else {
+    compact_top = cp->space->compaction_top();
+  }
+
+  // We allow some amount of garbage towards the bottom of the space, so
+  // we don't start compacting before there is a significant gain to be made.
+  // Occasionally, we want to ensure a full compaction, which is determined
+  // by the MarkSweepAlwaysCompactCount parameter.
+  uint invocations = MarkSweep::total_invocations();
+  bool skip_dead = ((invocations % MarkSweepAlwaysCompactCount) != 0);
+
+  size_t allowed_deadspace = 0;
+  if (skip_dead) {
+    const size_t ratio = space->allowed_dead_ratio();
+    allowed_deadspace = (space->capacity() * ratio / 100) / HeapWordSize;
+  }
+
+  HeapWord* q = space->bottom();
+  HeapWord* t = space->scan_limit();
+
+  HeapWord*  end_of_live= q;            // One byte beyond the last byte of the last
+                                        // live object.
+  HeapWord*  first_dead = space->end(); // The first dead object.
+  LiveRange* liveRange  = NULL;         // The current live range, recorded in the
+                                        // first header of preceding free area.
+  space->_first_dead = first_dead;
+
+  const intx interval = PrefetchScanIntervalInBytes;
+
+  while (q < t) {
+    assert(!space->scanned_block_is_obj(q) ||
+           oop(q)->mark()->is_marked() || oop(q)->mark()->is_unlocked() ||
+           oop(q)->mark()->has_bias_pattern(),
+           "these are the only valid states during a mark sweep");
+    if (space->scanned_block_is_obj(q) && oop(q)->is_gc_marked()) {
+      // prefetch beyond q
+      Prefetch::write(q, interval);
+      size_t size = space->scanned_block_size(q);
+      compact_top = cp->space->forward(oop(q), size, cp, compact_top);
+      q += size;
+      end_of_live = q;
+    } else {
+      // run over all the contiguous dead objects
+      HeapWord* end = q;
+      do {
+        // prefetch beyond end
+        Prefetch::write(end, interval);
+        end += space->scanned_block_size(end);
+      } while (end < t && (!space->scanned_block_is_obj(end) || !oop(end)->is_gc_marked()));
+
+      // see if we might want to pretend this object is alive so that
+      // we don't have to compact quite as often.
+      if (allowed_deadspace > 0 && q == compact_top) {
+        size_t sz = pointer_delta(end, q);
+        if (space->insert_deadspace(allowed_deadspace, q, sz)) {
+          compact_top = cp->space->forward(oop(q), sz, cp, compact_top);
+          q = end;
+          end_of_live = end;
+          continue;
+        }
+      }
+
+      // otherwise, it really is a free region.
+
+      // for the previous LiveRange, record the end of the live objects.
+      if (liveRange) {
+        liveRange->set_end(q);
+      }
+
+      // record the current LiveRange object.
+      // liveRange->start() is overlaid on the mark word.
+      liveRange = (LiveRange*)q;
+      liveRange->set_start(end);
+      liveRange->set_end(end);
+
+      // see if this is the first dead region.
+      if (q < first_dead) {
+        first_dead = q;
+      }
+
+      // move on to the next object
+      q = end;
+    }
+  }
+
+  assert(q == t, "just checking");
+  if (liveRange != NULL) {
+    liveRange->set_end(q);
+  }
+  space->_end_of_live = end_of_live;
+  if (end_of_live < first_dead) {
+    first_dead = end_of_live;
+  }
+  space->_first_dead = first_dead;
+
+  // save the compaction_top of the compaction space.
+  cp->space->set_compaction_top(compact_top);
+}
+
+template <class SpaceType>
+inline void CompactibleSpace::scan_and_adjust_pointers(SpaceType* space) {
+  // adjust all the interior pointers to point at the new locations of objects
+  // Used by MarkSweep::mark_sweep_phase3()
+
+  HeapWord* q = space->bottom();
+  HeapWord* t = space->_end_of_live;  // Established by "prepare_for_compaction".
+
+  assert(space->_first_dead <= space->_end_of_live, "Stands to reason, no?");
+
+  if (q < t && space->_first_dead > q && !oop(q)->is_gc_marked()) {
+    // we have a chunk of the space which hasn't moved and we've
+    // reinitialized the mark word during the previous pass, so we can't
+    // use is_gc_marked for the traversal.
+    HeapWord* end = space->_first_dead;
+
+    while (q < end) {
+      // I originally tried to conjoin "block_start(q) == q" to the
+      // assertion below, but that doesn't work, because you can't
+      // accurately traverse previous objects to get to the current one
+      // after their pointers have been
+      // updated, until the actual compaction is done.  dld, 4/00
+      assert(space->block_is_obj(q), "should be at block boundaries, and should be looking at objs");
+
+      // point all the oops to the new location
+      size_t size = MarkSweep::adjust_pointers(oop(q));
+      size = space->adjust_obj_size(size);
+
+      q += size;
+    }
+
+    if (space->_first_dead == t) {
+      q = t;
+    } else {
+      // $$$ This is funky.  Using this to read the previously written
+      // LiveRange.  See also use below.
+      q = (HeapWord*)oop(space->_first_dead)->mark()->decode_pointer();
+    }
+  }
+
+  const intx interval = PrefetchScanIntervalInBytes;
+
+  debug_only(HeapWord* prev_q = NULL);
+  while (q < t) {
+    // prefetch beyond q
+    Prefetch::write(q, interval);
+    if (oop(q)->is_gc_marked()) {
+      // q is alive
+      // point all the oops to the new location
+      size_t size = MarkSweep::adjust_pointers(oop(q));
+      size = space->adjust_obj_size(size);
+      debug_only(prev_q = q);
+      q += size;
+    } else {
+      // q is not a live object, so its mark should point at the next
+      // live object
+      debug_only(prev_q = q);
+      q = (HeapWord*) oop(q)->mark()->decode_pointer();
+      assert(q > prev_q, "we should be moving forward through memory");
+    }
+  }
+
+  assert(q == t, "just checking");
+}
+
+template <class SpaceType>
+inline void CompactibleSpace::scan_and_compact(SpaceType* space) {
+  // Copy all live objects to their new location
+  // Used by MarkSweep::mark_sweep_phase4()
+
+  HeapWord*       q = space->bottom();
+  HeapWord* const t = space->_end_of_live;
+  debug_only(HeapWord* prev_q = NULL);
+
+  if (q < t && space->_first_dead > q && !oop(q)->is_gc_marked()) {
+    #ifdef ASSERT // Debug only
+      // we have a chunk of the space which hasn't moved and we've reinitialized
+      // the mark word during the previous pass, so we can't use is_gc_marked for
+      // the traversal.
+      HeapWord* const end = space->_first_dead;
+
+      while (q < end) {
+        size_t size = space->obj_size(q);
+        assert(!oop(q)->is_gc_marked(), "should be unmarked (special dense prefix handling)");
+        prev_q = q;
+        q += size;
+      }
+    #endif
+
+    if (space->_first_dead == t) {
+      q = t;
+    } else {
+      // $$$ Funky
+      q = (HeapWord*) oop(space->_first_dead)->mark()->decode_pointer();
+    }
+  }
+
+  const intx scan_interval = PrefetchScanIntervalInBytes;
+  const intx copy_interval = PrefetchCopyIntervalInBytes;
+  while (q < t) {
+    if (!oop(q)->is_gc_marked()) {
+      // mark is pointer to next marked oop
+      debug_only(prev_q = q);
+      q = (HeapWord*) oop(q)->mark()->decode_pointer();
+      assert(q > prev_q, "we should be moving forward through memory");
+    } else {
+      // prefetch beyond q
+      Prefetch::read(q, scan_interval);
+
+      // size and destination
+      size_t size = space->obj_size(q);
+      HeapWord* compaction_top = (HeapWord*)oop(q)->forwardee();
+
+      // prefetch beyond compaction_top
+      Prefetch::write(compaction_top, copy_interval);
+
+      // copy object and reinit its mark
+      assert(q != compaction_top, "everything in this pass should be moving");
+      Copy::aligned_conjoint_words(q, compaction_top, size);
+      oop(compaction_top)->init_mark();
+      assert(oop(compaction_top)->klass() != NULL, "should have a class");
+
+      debug_only(prev_q = q);
+      q += size;
+    }
+  }
+
+  // Let's remember if we were empty before we did the compaction.
+  bool was_empty = space->used_region().is_empty();
+  // Reset space after compaction is complete
+  space->reset_after_compaction();
+  // We do this clear, below, since it has overloaded meanings for some
+  // space subtypes.  For example, OffsetTableContigSpace's that were
+  // compacted into will have had their offset table thresholds updated
+  // continuously, but those that weren't need to have their thresholds
+  // re-initialized.  Also mangles unused area for debugging.
+  if (space->used_region().is_empty()) {
+    if (!was_empty) space->clear(SpaceDecorator::Mangle);
+  } else {
+    if (ZapUnusedHeapArea) space->mangle_unused_area();
+  }
+}
+#endif // SHARE_VM_GC_SHARED_SPACE_INLINE_HPP