--- /dev/null	2014-08-08 13:31:44.343351868 +0200
+++ new/src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp	2014-08-11 13:46:01.687429457 +0200
@@ -0,0 +1,171 @@
+/*
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
+#include "oops/markOop.hpp"
+#include "oops/oop.inline.hpp"
+#include "services/memTracker.hpp"
+#ifdef TARGET_OS_FAMILY_linux
+# include "os_linux.inline.hpp"
+#endif
+#ifdef TARGET_OS_FAMILY_solaris
+# include "os_solaris.inline.hpp"
+#endif
+#ifdef TARGET_OS_FAMILY_windows
+# include "os_windows.inline.hpp"
+#endif
+#ifdef TARGET_OS_FAMILY_aix
+# include "os_aix.inline.hpp"
+#endif
+#ifdef TARGET_OS_FAMILY_bsd
+# include "os_bsd.inline.hpp"
+#endif
+#include "utilities/bitMap.inline.hpp"
+
+G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL),
+  _high_boundary(NULL), _committed(), _page_size(0), _special(false), _executable(false) {
+}
+
+bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) {
+  if (!rs.is_reserved()) {
+    return false;  // allocation failed.   
+  }
+  assert(_low_boundary == NULL, "VirtualSpace already initialized");
+  assert(page_size > 0, "Granularity must be non-zero.");
+
+  _low_boundary  = rs.base();
+  _high_boundary = _low_boundary + rs.size();
+
+  _special = rs.special();
+  _executable = rs.executable();
+
+  _page_size = page_size;
+
+  assert(_committed.size() == 0, "virtual space initialized more than once");
+  uintx size_in_bits = rs.size() / page_size;
+  _committed.resize(size_in_bits, /* in_resource_area */ false);
+
+  if (_special) {
+    _committed.set_range(0, size_in_bits);
+  }
+
+  return true;
+}
+
+
+G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
+  release();
+}
+
+void G1PageBasedVirtualSpace::release() {
+  // This does not release memory it never reserved.
+  // Caller must release via rs.release();
+  _low_boundary           = NULL;
+  _high_boundary          = NULL;
+  _special                = false;
+  _executable             = false;
+  _page_size              = 0;
+  _committed.resize(0, false);
+}
+
+size_t G1PageBasedVirtualSpace::committed_size() const {
+  return _committed.count_one_bits() * _page_size;
+}
+
+size_t G1PageBasedVirtualSpace::reserved_size() const {
+  return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
+}
+
+size_t G1PageBasedVirtualSpace::uncommitted_size()  const {
+  return reserved_size() - committed_size();
+}
+
+uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
+  return (addr - _low_boundary) / _page_size;
+}
+
+bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
+  uintptr_t end = start + size_in_pages;
+  return _committed.get_next_zero_offset(start, end) >= end;
+}
+
+bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
+  uintptr_t end = start + size_in_pages;
+  return _committed.get_next_one_offset(start, end) >= end;
+}
+
+char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
+  return _low_boundary + index * _page_size;
+}
+
+size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
+  return num * _page_size;
+}
+
+MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
+  // We need to make sure to commit all pages covered by the given area.
+  guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
+
+  if (!_special) {
+    os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
+                              err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
+  }
+  _committed.set_range(start, start + size_in_pages);
+
+  MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
+  return result;
+}
+
+MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
+  guarantee(is_area_committed(start, size_in_pages), "checking");
+
+  if (!_special) {
+    os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
+  }
+
+  _committed.clear_range(start, start + size_in_pages);
+
+  MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
+  return result;
+}
+
+bool G1PageBasedVirtualSpace::contains(const void* p) const {
+  return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
+}
+
+#ifndef PRODUCT
+void G1PageBasedVirtualSpace::print_on(outputStream* out) {
+  out->print   ("Virtual space:");
+  if (special()) out->print(" (pinned in memory)");
+  out->cr();
+  out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
+  out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
+  out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",  p2i(_low_boundary), p2i(_high_boundary));
+}
+
+void G1PageBasedVirtualSpace::print() {
+  print_on(tty);
+}
+#endif