--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/hSpaceCounters.cpp	Sat Dec 02 06:51:10 2017 +0100
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2011, 2017, 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/shared/hSpaceCounters.hpp"
+#include "memory/allocation.inline.hpp"
+#include "memory/resourceArea.hpp"
+#include "runtime/perfData.hpp"
+
+HSpaceCounters::HSpaceCounters(const char* name_space,
+                               const char* name,
+                               int ordinal,
+                               size_t max_size,
+                               size_t initial_capacity) {
+
+  if (UsePerfData) {
+    EXCEPTION_MARK;
+    ResourceMark rm;
+
+    const char* cns =
+      PerfDataManager::name_space(name_space, "space", ordinal);
+
+    _name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtGC);
+    strcpy(_name_space, cns);
+
+    const char* cname = PerfDataManager::counter_name(_name_space, "name");
+    PerfDataManager::create_string_constant(SUN_GC, cname, name, CHECK);
+
+    cname = PerfDataManager::counter_name(_name_space, "maxCapacity");
+    PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes,
+                                     (jlong)max_size, CHECK);
+
+    cname = PerfDataManager::counter_name(_name_space, "capacity");
+    _capacity = PerfDataManager::create_variable(SUN_GC, cname,
+                                                 PerfData::U_Bytes,
+                                                 initial_capacity, CHECK);
+
+    cname = PerfDataManager::counter_name(_name_space, "used");
+    _used = PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes,
+                                             (jlong) 0, CHECK);
+
+    cname = PerfDataManager::counter_name(_name_space, "initCapacity");
+    PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes,
+                                     initial_capacity, CHECK);
+  }
+}
+
+HSpaceCounters::~HSpaceCounters() {
+  if (_name_space != NULL) {
+    FREE_C_HEAP_ARRAY(char, _name_space);
+  }
+}
+
+void HSpaceCounters::update_capacity(size_t v) {
+  _capacity->set_value(v);
+}
+
+void HSpaceCounters::update_used(size_t v) {
+  _used->set_value(v);
+}
+
+void HSpaceCounters::update_all(size_t capacity, size_t used) {
+  update_capacity(capacity);
+  update_used(used);
+}
+
+debug_only(
+  // for security reasons, we do not allow arbitrary reads from
+  // the counters as they may live in shared memory.
+  jlong HSpaceCounters::used() {
+    return _used->get_value();
+  }
+  jlong HSpaceCounters::capacity() {
+    return _used->get_value();
+  }
+)