--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/z/zThreadLocalAllocBuffer.cpp	Wed Feb 20 13:43:01 2019 +0100
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2018, 2019, 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/z/zAddress.inline.hpp"
+#include "gc/z/zThreadLocalAllocBuffer.hpp"
+#include "runtime/globals.hpp"
+#include "runtime/thread.hpp"
+
+ZPerWorker<ThreadLocalAllocStats>* ZThreadLocalAllocBuffer::_stats = NULL;
+
+void ZThreadLocalAllocBuffer::initialize() {
+  if (UseTLAB) {
+    assert(_stats == NULL, "Already initialized");
+    _stats = new ZPerWorker<ThreadLocalAllocStats>();
+    reset_statistics();
+  }
+}
+
+void ZThreadLocalAllocBuffer::reset_statistics() {
+  if (UseTLAB) {
+    ZPerWorkerIterator<ThreadLocalAllocStats> iter(_stats);
+    for (ThreadLocalAllocStats* stats; iter.next(&stats);) {
+      stats->reset();
+    }
+  }
+}
+
+void ZThreadLocalAllocBuffer::publish_statistics() {
+  if (UseTLAB) {
+    ThreadLocalAllocStats total;
+
+    ZPerWorkerIterator<ThreadLocalAllocStats> iter(_stats);
+    for (ThreadLocalAllocStats* stats; iter.next(&stats);) {
+      total.update(*stats);
+    }
+
+    total.publish();
+  }
+}
+
+static void fixup_address(HeapWord** p) {
+  *p = (HeapWord*)ZAddress::good_or_null((uintptr_t)*p);
+}
+
+void ZThreadLocalAllocBuffer::retire(Thread* thread) {
+  if (UseTLAB && thread->is_Java_thread()) {
+    ThreadLocalAllocStats* const stats = _stats->addr();
+    thread->tlab().addresses_do(fixup_address);
+    thread->tlab().retire(stats);
+    thread->tlab().resize();
+  }
+}
+
+void ZThreadLocalAllocBuffer::remap(Thread* thread) {
+  if (UseTLAB && thread->is_Java_thread()) {
+    thread->tlab().addresses_do(fixup_address);
+  }
+}