--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/org/openjdk/gcbench/wip/BarriersOnConsts.java	Mon Mar 05 11:16:08 2018 +0100
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2017, Red Hat Inc. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.gcbench.wip;
+
+import org.openjdk.jmh.annotations.*;
+
+import java.util.concurrent.TimeUnit;
+
+@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Fork(1)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@Threads(1)
+@State(Scope.Benchmark)
+public class BarriersOnConsts {
+
+    static final Target STATIC_FINAL_TARGET = new Target();
+
+    @Benchmark
+    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
+    public Object readBarrier() {
+        return STATIC_FINAL_TARGET.field;
+    }
+
+    @Benchmark
+    @CompilerControl(CompilerControl.Mode.DONT_INLINE)
+    public void writeBarrier() {
+        STATIC_FINAL_TARGET.field = STATIC_FINAL_TARGET;
+    }
+
+    static class Target {
+        Object field;
+    }
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/org/openjdk/gcbench/wip/HashMapTraverse.java	Mon Mar 05 11:16:08 2018 +0100
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2017, Red Hat Inc. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.gcbench.wip;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+import java.nio.charset.Charset;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Fork(1)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@Threads(1)
+@State(Scope.Benchmark)
+public class HashMapTraverse {
+
+    @Param({"1", "100", "10000", "1000000"})
+    int size;
+
+    Map<String, String> map;
+
+    @Setup
+    public void setup() {
+        map = new HashMap<>();
+        for (int c = 0; c < size; c++) {
+            map.put("Key " + c, "Value " + c);
+        }
+    }
+
+    @Benchmark
+    public void test(Blackhole bh) {
+        for (Map.Entry<String, String> kv : map.entrySet()) {
+            bh.consume(kv.getKey());
+            bh.consume(new Object());
+        }
+    }
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/org/openjdk/gcbench/wip/ProfiledLoopPredicate.java	Mon Mar 05 11:16:08 2018 +0100
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2017, Red Hat Inc. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.gcbench.wip;
+
+import org.openjdk.jmh.annotations.*;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.concurrent.TimeUnit;
+
+@Warmup(iterations = 5)
+@Measurement(iterations = 5)
+@Fork(1)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Thread)
+public class ProfiledLoopPredicate {
+
+    final int len = 10;
+
+    int[] arr = new int[len];
+    int start = len / 4;
+    int limit = len / 2;
+
+    @Benchmark
+    public void test() {
+        int[] a = arr;
+        for (int c = start; c < limit; c++) {
+            a[c * 2] = c;
+        }
+    }
+
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/org/openjdk/gcbench/wip/VolatileBarriers.java	Mon Mar 05 11:16:08 2018 +0100
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2017, Red Hat Inc. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.gcbench.wip;
+
+import org.openjdk.jmh.annotations.*;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
+
+@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Fork(1)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@Threads(1)
+@State(Scope.Benchmark)
+public class VolatileBarriers {
+
+    static final AtomicReferenceFieldUpdater<VolatileBarriers, Object> AFU_X =
+            AtomicReferenceFieldUpdater.newUpdater(VolatileBarriers.class, Object.class, "x");
+
+    static final AtomicReferenceFieldUpdater<VolatileBarriers, Object> AFU_Y =
+            AtomicReferenceFieldUpdater.newUpdater(VolatileBarriers.class, Object.class, "y");
+
+    static final AtomicReferenceFieldUpdater<VolatileBarriers, Object> AFU_Z =
+            AtomicReferenceFieldUpdater.newUpdater(VolatileBarriers.class, Object.class, "z");
+
+    volatile Object x = new Object();
+    volatile Object y = new Object();
+    volatile Object z = new Object();
+
+    @Benchmark
+    public void test() {
+        Object x = AFU_X.get(this);
+        Object y = AFU_Y.get(this);
+        Object z = AFU_Z.get(this);
+        AFU_X.lazySet(this, z);
+        AFU_Y.lazySet(this, x);
+        AFU_Z.lazySet(this, y);
+    }
+
+}