# HG changeset patch
# User ehelin
# Date 1492506069 -7200
# Node ID 2dd13ff72976fb0b95f8cd092b35ee318067ee25
# Parent  4cca6758a9ee850cb4c7b4f07c9e6d6a7eb6f117
8177968: Add GC stress test TestGCLocker
Reviewed-by: pliden, lmesnik

diff -r 4cca6758a9ee -r 2dd13ff72976 hotspot/make/test/JtregNative.gmk
--- a/hotspot/make/test/JtregNative.gmk	Wed Apr 05 14:21:58 2017 +0200
+++ b/hotspot/make/test/JtregNative.gmk	Tue Apr 18 11:01:09 2017 +0200
@@ -43,6 +43,7 @@
 
 # Add more directories here when needed.
 BUILD_HOTSPOT_JTREG_NATIVE_SRC += \
+    $(HOTSPOT_TOPDIR)/test/gc/stress/gclocker \
     $(HOTSPOT_TOPDIR)/test/native_sanity \
     $(HOTSPOT_TOPDIR)/test/runtime/jni/8025979 \
     $(HOTSPOT_TOPDIR)/test/runtime/jni/8033445 \
diff -r 4cca6758a9ee -r 2dd13ff72976 hotspot/test/gc/stress/gclocker/TestGCLocker.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/stress/gclocker/TestGCLocker.java	Tue Apr 18 11:01:09 2017 +0200
@@ -0,0 +1,224 @@
+/*
+ * Copyright (c) 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.
+ *
+ */
+
+// Stress the GC locker by calling GetPrimitiveArrayCritical while
+// concurrently filling up old gen.
+
+import java.lang.management.MemoryPoolMXBean;
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryUsage;
+import java.nio.ByteBuffer;
+import java.util.ArrayDeque;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+
+final class ThreadUtils {
+    public static void sleep(long durationMS) {
+        try {
+            Thread.sleep(durationMS);
+        } catch (Exception e) {
+        }
+    }
+}
+
+class Filler {
+    private static final int SIZE = 250000;
+
+    private int[] i1 = new int[SIZE];
+    private int[] i2 = new int[SIZE];
+    private short[] s1 = new short[SIZE];
+    private short[] s2 = new short[SIZE];
+
+    private Map<Object, Object> map = new HashMap<>();
+
+    public Filler() {
+        for (int i = 0; i < 10000; i++) {
+            map.put(new Object(), new Object());
+        }
+    }
+}
+
+class Exitable {
+    private volatile boolean shouldExit = false;
+
+    protected boolean shouldExit() {
+        return shouldExit;
+    }
+
+    public void exit() {
+        shouldExit = true;
+    }
+}
+
+class MemoryWatcher {
+    private MemoryPoolMXBean bean;
+    private final int thresholdPromille = 750;
+    private final int criticalThresholdPromille = 800;
+    private final int minGCWaitMS = 1000;
+    private final int minFreeWaitElapsedMS = 30000;
+    private final int minFreeCriticalWaitMS = 500;
+
+    private int lastUsage = 0;
+    private long lastGCDetected = System.currentTimeMillis();
+    private long lastFree = System.currentTimeMillis();
+
+    public MemoryWatcher(String mxBeanName) {
+        List<MemoryPoolMXBean> memoryBeans = ManagementFactory.getMemoryPoolMXBeans();
+        for (MemoryPoolMXBean bean : memoryBeans) {
+            if (bean.getName().equals(mxBeanName)) {
+                this.bean = bean;
+                break;
+            }
+        }
+    }
+
+    private int getMemoryUsage() {
+        if (bean == null) {
+            Runtime r = Runtime.getRuntime();
+            float free = (float) r.freeMemory() / r.maxMemory();
+            return Math.round((1 - free) * 1000);
+        } else {
+            MemoryUsage usage = bean.getUsage();
+            float used = (float) usage.getUsed() / usage.getCommitted();
+            return Math.round(used * 1000);
+        }
+    }
+
+    public synchronized boolean shouldFreeUpSpace() {
+        int usage = getMemoryUsage();
+        long now = System.currentTimeMillis();
+
+        boolean detectedGC = false;
+        if (usage < lastUsage) {
+            lastGCDetected = now;
+            detectedGC = true;
+        }
+
+        lastUsage = usage;
+
+        long elapsed = now - lastFree;
+        long timeSinceLastGC = now - lastGCDetected;
+
+        if (usage > criticalThresholdPromille && elapsed > minFreeCriticalWaitMS) {
+            lastFree = now;
+            return true;
+        } else if (usage > thresholdPromille && !detectedGC) {
+            if (elapsed > minFreeWaitElapsedMS || timeSinceLastGC > minGCWaitMS) {
+                lastFree = now;
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
+
+class MemoryUser extends Exitable implements Runnable {
+    private final Queue<Filler> cache = new ArrayDeque<Filler>();
+    private final MemoryWatcher watcher;
+
+    private void load() {
+        if (watcher.shouldFreeUpSpace()) {
+            int toRemove = cache.size() / 5;
+            for (int i = 0; i < toRemove; i++) {
+                cache.remove();
+            }
+        }
+        cache.add(new Filler());
+    }
+
+    public MemoryUser(String mxBeanName) {
+        watcher = new MemoryWatcher(mxBeanName);
+    }
+
+    @Override
+    public void run() {
+        for (int i = 0; i < 200; i++) {
+            load();
+        }
+
+        while (!shouldExit()) {
+            load();
+        }
+    }
+}
+
+class GCLockerStresser extends Exitable implements Runnable {
+    static native void fillWithRandomValues(byte[] array);
+
+    @Override
+    public void run() {
+        byte[] array = new byte[1024 * 1024];
+        while (!shouldExit()) {
+            fillWithRandomValues(array);
+        }
+    }
+}
+
+public class TestGCLocker {
+    private static Exitable startGCLockerStresser(String name) {
+        GCLockerStresser task = new GCLockerStresser();
+
+        Thread thread = new Thread(task);
+        thread.setName(name);
+        thread.setPriority(Thread.MIN_PRIORITY);
+        thread.start();
+
+        return task;
+    }
+
+    private static Exitable startMemoryUser(String mxBeanName) {
+        MemoryUser task = new MemoryUser(mxBeanName);
+
+        Thread thread = new Thread(task);
+        thread.setName("Memory User");
+        thread.start();
+
+        return task;
+    }
+
+    public static void main(String[] args) {
+        System.loadLibrary("TestGCLocker");
+
+        long durationMinutes = args.length > 0 ? Long.parseLong(args[0]) : 5;
+        String mxBeanName = args.length > 1 ? args[1] : null;
+
+        long startMS = System.currentTimeMillis();
+
+        Exitable stresser1 = startGCLockerStresser("GCLockerStresser1");
+        Exitable stresser2 = startGCLockerStresser("GCLockerStresser2");
+        Exitable memoryUser = startMemoryUser(mxBeanName);
+
+        long durationMS = durationMinutes * 60 * 1000;
+        while ((System.currentTimeMillis() - startMS) < durationMS) {
+            ThreadUtils.sleep(10 * 1010);
+        }
+
+        stresser1.exit();
+        stresser2.exit();
+        memoryUser.exit();
+    }
+}
diff -r 4cca6758a9ee -r 2dd13ff72976 hotspot/test/gc/stress/gclocker/TestGCLockerWithCMS.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/stress/gclocker/TestGCLockerWithCMS.java	Tue Apr 18 11:01:09 2017 +0200
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 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.
+ *
+ */
+
+/*
+ * @test TestGCLockerWithCMS
+ * @key gc
+ * @requires vm.gc.ConcMarkSweep
+ * @summary Stress CMS' GC locker by calling GetPrimitiveArrayCritical while concurrently filling up old gen.
+ * @run main/native/othervm/timeout=200 -Xlog:gc*=info -Xms1500m -Xmx1500m -XX:+UseConcMarkSweepGC TestGCLockerWithCMS
+ */
+public class TestGCLockerWithCMS {
+    public static void main(String[] args) {
+        String[] testArgs = {"2", "CMS Old Gen"};
+        TestGCLocker.main(testArgs);
+    }
+}
diff -r 4cca6758a9ee -r 2dd13ff72976 hotspot/test/gc/stress/gclocker/TestGCLockerWithG1.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/stress/gclocker/TestGCLockerWithG1.java	Tue Apr 18 11:01:09 2017 +0200
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 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.
+ *
+ */
+
+/*
+ * @test TestGCLockerWithG1
+ * @key gc
+ * @requires vm.gc.G1
+ * @summary Stress G1's GC locker by calling GetPrimitiveArrayCritical while concurrently filling up old gen.
+ * @run main/native/othervm/timeout=200 -Xlog:gc*=info -Xms1500m -Xmx1500m -XX:+UseG1GC TestGCLockerWithG1
+ */
+public class TestGCLockerWithG1 {
+    public static void main(String[] args) {
+        String[] testArgs = {"2", "G1 Old Gen"};
+        TestGCLocker.main(testArgs);
+    }
+}
diff -r 4cca6758a9ee -r 2dd13ff72976 hotspot/test/gc/stress/gclocker/TestGCLockerWithParallel.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/stress/gclocker/TestGCLockerWithParallel.java	Tue Apr 18 11:01:09 2017 +0200
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 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.
+ *
+ */
+
+/*
+ * @test TestGCLockerWithParallel
+ * @key gc
+ * @requires vm.gc.Parallel
+ * @summary Stress Parallel's GC locker by calling GetPrimitiveArrayCritical while concurrently filling up old gen.
+ * @run main/native/othervm/timeout=200 -Xlog:gc*=info -Xms1500m -Xmx1500m -XX:+UseParallelGC TestGCLockerWithParallel
+ */
+public class TestGCLockerWithParallel {
+    public static void main(String[] args) {
+        String[] testArgs = {"2", "PS Old Gen"};
+        TestGCLocker.main(testArgs);
+    }
+}
diff -r 4cca6758a9ee -r 2dd13ff72976 hotspot/test/gc/stress/gclocker/TestGCLockerWithSerial.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/stress/gclocker/TestGCLockerWithSerial.java	Tue Apr 18 11:01:09 2017 +0200
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 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.
+ *
+ */
+
+/*
+ * @test TestGCLockerWithSerial
+ * @key gc
+ * @requires vm.gc.Serial
+ * @summary Stress Serial's GC locker by calling GetPrimitiveArrayCritical while concurrently filling up old gen.
+ * @run main/native/othervm/timeout=200 -Xlog:gc*=info -Xmx1500m -Xmx1500m -XX:+UseSerialGC TestGCLockerWithSerial
+ */
+public class TestGCLockerWithSerial {
+    public static void main(String[] args) {
+        String[] testArgs = {"2", "Tenured Gen"};
+        TestGCLocker.main(testArgs);
+    }
+}
diff -r 4cca6758a9ee -r 2dd13ff72976 hotspot/test/gc/stress/gclocker/libTestGCLocker.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/stress/gclocker/libTestGCLocker.c	Tue Apr 18 11:01:09 2017 +0200
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 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 <jni.h>
+
+JNIEXPORT void JNICALL
+Java_GCLockerStresser_fillWithRandomValues(JNIEnv* env, jclass clz, jbyteArray arr) {
+  jsize size = (*env)->GetArrayLength(env, arr);
+  jbyte* p = (*env)->GetPrimitiveArrayCritical(env, arr, NULL);
+  jsize i;
+  for (i = 0; i < size; i++) {
+    p[i] = i % 128;
+  }
+  (*env)->ReleasePrimitiveArrayCritical(env, arr, p, 0);
+}