--- /dev/null	2018-04-03 12:55:20.301839954 +0200
+++ new/src/hotspot/share/gc/z/zTracer.cpp	2018-06-01 22:31:10.249160243 +0200
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2016, 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/z/zStat.hpp"
+#include "gc/z/zTracer.hpp"
+#include "gc/shared/gcId.hpp"
+#include "gc/shared/gcLocker.hpp"
+#include "jfr/jfrEvents.hpp"
+#include "runtime/safepointVerifiers.hpp"
+
+ZTracer* ZTracer::_tracer = NULL;
+
+ZTracer::ZTracer() :
+    GCTracer(Z) {}
+
+void ZTracer::initialize() {
+  _tracer = new (ResourceObj::C_HEAP, mtGC) ZTracer();
+}
+
+void ZTracer::send_stat_counter(uint32_t counter_id, uint64_t increment, uint64_t value) {
+  NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
+
+  EventZStatisticsCounter e;
+  if (e.should_commit()) {
+    e.set_id(counter_id);
+    e.set_increment(increment);
+    e.set_value(value);
+    e.commit();
+  }
+}
+
+void ZTracer::send_stat_sampler(uint32_t sampler_id, uint64_t value) {
+  NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
+
+  EventZStatisticsSampler e;
+  if (e.should_commit()) {
+    e.set_id(sampler_id);
+    e.set_value(value);
+    e.commit();
+  }
+}
+
+void ZTracer::send_thread_phase(const char* name, const Ticks& start, const Ticks& end) {
+  NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
+
+  EventZThreadPhase e(UNTIMED);
+  if (e.should_commit()) {
+    e.set_gcId(GCId::current_or_undefined());
+    e.set_name(name);
+    e.set_starttime(start);
+    e.set_endtime(end);
+    e.commit();
+  }
+}
+
+void ZTracer::send_page_alloc(size_t size, size_t used, size_t free, size_t cache, bool nonblocking, bool noreserve) {
+  NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
+
+  EventZPageAllocation e;
+  if (e.should_commit()) {
+    e.set_pageSize(size);
+    e.set_usedAfter(used);
+    e.set_freeAfter(free);
+    e.set_inCacheAfter(cache);
+    e.set_nonBlocking(nonblocking);
+    e.set_noReserve(noreserve);
+    e.commit();
+  }
+}
+
+void ZTracer::report_stat_counter(const ZStatCounter& counter, uint64_t increment, uint64_t value) {
+  send_stat_counter(counter.id(), increment, value);
+}
+
+void ZTracer::report_stat_sampler(const ZStatSampler& sampler, uint64_t value) {
+  send_stat_sampler(sampler.id(), value);
+}
+
+void ZTracer::report_thread_phase(const ZStatPhase& phase, const Ticks& start, const Ticks& end) {
+  send_thread_phase(phase.name(), start, end);
+}
+
+void ZTracer::report_thread_phase(const char* name, const Ticks& start, const Ticks& end) {
+  send_thread_phase(name, start, end);
+}
+
+void ZTracer::report_page_alloc(size_t size, size_t used, size_t free, size_t cache, ZAllocationFlags flags) {
+  send_page_alloc(size, used, free, cache, flags.non_blocking(), flags.no_reserve());
+}