changeset 43933:85ee551f3948

8170737: Not enough old space utilisation Reviewed-by: dfazunen, tschatzl
author mchernov
date Fri, 03 Feb 2017 15:45:57 +0300
parents acc1d9072823
children 85442814afb1
files hotspot/test/serviceability/tmtools/jstat/GarbageProducerTest.java hotspot/test/serviceability/tmtools/jstat/GcCauseTest02.java hotspot/test/serviceability/tmtools/jstat/GcTest02.java hotspot/test/serviceability/tmtools/jstat/utils/GarbageProducer.java hotspot/test/serviceability/tmtools/jstat/utils/GcProvoker.java hotspot/test/serviceability/tmtools/jstat/utils/GcProvokerImpl.java hotspot/test/serviceability/tmtools/jstat/utils/JstatGcCapacityResults.java hotspot/test/serviceability/tmtools/jstat/utils/JstatGcCauseResults.java hotspot/test/serviceability/tmtools/jstat/utils/JstatGcNewResults.java hotspot/test/serviceability/tmtools/jstat/utils/JstatGcResults.java hotspot/test/serviceability/tmtools/jstat/utils/JstatResults.java
diffstat 11 files changed, 266 insertions(+), 319 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/GarbageProducerTest.java	Fri Feb 03 15:45:57 2017 +0300
@@ -0,0 +1,89 @@
+/*
+ * 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.
+ */
+
+import java.lang.management.ManagementFactory;
+import utils.GarbageProducer;
+import common.TmTool;
+import utils.JstatResults;
+
+/**
+ * Base class for jstat testing which uses GarbageProducer to allocate garbage.
+ */
+public class GarbageProducerTest {
+
+    // Iterations of measurement to get consistent value of counters and jstat.
+    private final static int ITERATIONS = 10;
+    private final static float TARGET_MEMORY_USAGE = 0.7f;
+    private final static float MEASUREMENT_TOLERANCE = 0.05f;
+    private final GarbageProducer garbageProducer;
+    private final TmTool<? extends JstatResults> jstatTool;
+
+    public GarbageProducerTest(TmTool<? extends JstatResults> tool) {
+        garbageProducer = new GarbageProducer(TARGET_MEMORY_USAGE);
+        // We will be running jstat tool
+        jstatTool = tool;
+    }
+
+    public void run() throws Exception {
+        // Run once and get the  results asserting that they are reasonable
+        JstatResults measurement1 = jstatTool.measure();
+        measurement1.assertConsistency();
+        // Eat metaspace and heap then run the tool again and get the results  asserting that they are reasonable
+        System.gc();
+        garbageProducer.allocateMetaspaceAndHeap();
+        // Collect garbage. Also update VM statistics
+        System.gc();
+        int i = 0;
+        long collectionCountBefore = getCollectionCount();
+        JstatResults measurement2 = jstatTool.measure();
+        do {
+            System.out.println("Measurement #" + i);
+            long currentCounter = getCollectionCount();
+            // Check if GC cycle occured during measurement
+            if (currentCounter == collectionCountBefore) {
+                measurement2.assertConsistency();
+                checkOldGenMeasurement(measurement2);
+                return;
+            } else {
+                System.out.println("GC happened during measurement.");
+            }
+            collectionCountBefore = getCollectionCount();
+            measurement2 = jstatTool.measure();
+
+        } while (i++ < ITERATIONS);
+        // Checking will be performed without consistency guarantee.
+        checkOldGenMeasurement(measurement2);
+    }
+
+    private void checkOldGenMeasurement(JstatResults measurement2) {
+        float oldGenAllocationRatio = garbageProducer.getOldGenAllocationRatio() - MEASUREMENT_TOLERANCE;
+        // Assert that space has been utilized accordingly
+        JstatResults.assertSpaceUtilization(measurement2, TARGET_MEMORY_USAGE, oldGenAllocationRatio);
+    }
+
+    private static long getCollectionCount() {
+        return ManagementFactory.getGarbageCollectorMXBeans().stream()
+                .mapToLong(b -> b.getCollectionCount())
+                .sum();
+    }
+}
--- a/hotspot/test/serviceability/tmtools/jstat/GcCauseTest02.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/GcCauseTest02.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -25,39 +25,19 @@
  * @test
  * @summary Test checks output displayed with jstat -gccause.
  *          Test scenario:
- *          tests forces debuggee application eat ~70% of heap and runs jstat.
- *          jstat should show that ~70% of heap (OC/OU ~= 70%).
+ *          test forces debuggee application eat ~70% of heap and runs jstat.
+ *          jstat should show actual usage of old gen (OC/OU ~= old gen usage).
  * @requires vm.opt.ExplicitGCInvokesConcurrent != true
  * @modules java.base/jdk.internal.misc
  * @library /test/lib
  * @library ../share
- * @run main/othervm -XX:+UsePerfData -XX:InitialHeapSize=128M -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcCauseTest02
+ * @run main/othervm -XX:+UsePerfData -XX:MaxNewSize=4m -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcCauseTest02
  */
 import utils.*;
 
 public class GcCauseTest02 {
 
-    private final static float targetMemoryUsagePercent = 0.7f;
-
     public static void main(String[] args) throws Exception {
-
-        // We will be running "jstat -gc" tool
-        JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().getPid());
-
-        // Run once and get the  results asserting that they are reasonable
-        JstatGcCauseResults measurement1 = jstatGcTool.measure();
-        measurement1.assertConsistency();
-
-        GcProvoker gcProvoker = new GcProvoker();
-
-        // Eat metaspace and heap then run the tool again and get the results  asserting that they are reasonable
-        gcProvoker.allocateAvailableMetaspaceAndHeap(targetMemoryUsagePercent);
-        // Collect garbage. Also update VM statistics
-        System.gc();
-        JstatGcCauseResults measurement2 = jstatGcTool.measure();
-        measurement2.assertConsistency();
-
-        // Assert that space has been utilized acordingly
-        JstatResults.assertSpaceUtilization(measurement2, targetMemoryUsagePercent);
+        new GarbageProducerTest(new JstatGcCauseTool(ProcessHandle.current().getPid())).run();
     }
 }
--- a/hotspot/test/serviceability/tmtools/jstat/GcTest02.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/GcTest02.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -21,43 +21,23 @@
  * questions.
  */
 
-import utils.*;
 /*
  * @test
  * @summary Test checks output displayed with jstat -gc.
  *          Test scenario:
- *          tests forces debuggee application eat ~70% of heap and runs jstat.
- *          jstat should show that ~70% of heap is utilized (OC/OU ~= 70%).
+ *          test forces debuggee application eat ~70% of heap and runs jstat.
+ *          jstat should show actual usage of old gen (OC/OU ~= old gen usage).
  * @requires vm.opt.ExplicitGCInvokesConcurrent != true
  * @modules java.base/jdk.internal.misc
  * @library /test/lib
  * @library ../share
- * @run main/othervm -XX:+UsePerfData -XX:InitialHeapSize=128M -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcTest02
+ * @run main/othervm -XX:+UsePerfData -XX:MaxNewSize=4m -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcTest02
  */
+import utils.*;
 
 public class GcTest02 {
 
-    private final static float targetMemoryUsagePercent = 0.7f;
-
     public static void main(String[] args) throws Exception {
-
-        // We will be running "jstat -gc" tool
-        JstatGcTool jstatGcTool = new JstatGcTool(ProcessHandle.current().getPid());
-
-        // Run once and get the  results asserting that they are reasonable
-        JstatGcResults measurement1 = jstatGcTool.measure();
-        measurement1.assertConsistency();
-
-        GcProvoker gcProvoker = new GcProvoker();
-
-        // Eat metaspace and heap then run the tool again and get the results  asserting that they are reasonable
-        gcProvoker.allocateAvailableMetaspaceAndHeap(targetMemoryUsagePercent);
-        // Collect garbage. Also updates VM statistics
-        System.gc();
-        JstatGcResults measurement2 = jstatGcTool.measure();
-        measurement2.assertConsistency();
-
-        // Assert that space has been utilized acordingly
-        JstatResults.assertSpaceUtilization(measurement2, targetMemoryUsagePercent);
+        new GarbageProducerTest(new JstatGcTool(ProcessHandle.current().getPid())).run();
     }
 }
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/GarbageProducer.java	Fri Feb 03 15:45:57 2017 +0300
@@ -0,0 +1,121 @@
+/*
+ * 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.
+ */
+package utils;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryMXBean;
+import java.lang.management.MemoryPoolMXBean;
+import java.lang.management.MemoryUsage;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This is an class used to allocate specified amount of metaspace and heap.
+ */
+public class GarbageProducer {
+
+    // Uses fixed small objects to avoid Humongous objects allocation with G1 GC.
+    private static final int MEMORY_CHUNK = 2048;
+
+    public static List<Object> allocatedMetaspace;
+    public static List<Object> allocatedMemory;
+
+    private final MemoryMXBean memoryMXBean;
+    private final float targetMemoryUsagePercent;
+    private final long targetMemoryUsage;
+
+    /**
+     * @param targetMemoryUsagePercent how many percent of metaspace and heap to
+     * allocate
+     */
+    public GarbageProducer(float targetMemoryUsagePercent) {
+        memoryMXBean = ManagementFactory.getMemoryMXBean();
+        this.targetMemoryUsagePercent = targetMemoryUsagePercent;
+        targetMemoryUsage = (long) (memoryMXBean.getHeapMemoryUsage().getMax() * targetMemoryUsagePercent);
+    }
+
+    /**
+     * Allocates heap and metaspace upon exit targetMemoryUsagePercent percents
+     * of heap and metaspace have been consumed.
+     */
+    public void allocateMetaspaceAndHeap() {
+        // Metaspace should be filled before Java Heap to prevent unexpected OOME
+        // in the Java Heap while filling Metaspace
+        allocatedMetaspace = eatMetaspace(targetMemoryUsagePercent);
+        allocatedMemory = allocateGarbage(targetMemoryUsage);
+    }
+
+    private List<Object> eatMetaspace(float targetUsage) {
+        List<Object> list = new ArrayList<>();
+        MemoryPoolMXBean metaspacePool = getMatchedMemoryPool(".*Metaspace.*");
+        float currentUsage;
+        GeneratedClassProducer gp = new GeneratedClassProducer();
+        do {
+            try {
+                list.add(gp.create(0));
+            } catch (OutOfMemoryError oome) {
+                list = null;
+                throw new RuntimeException("Unexpected OOME '" + oome.getMessage() + "' while eating " + targetUsage + " of Metaspace.");
+            }
+            MemoryUsage memoryUsage = metaspacePool.getUsage();
+            currentUsage = (((float) memoryUsage.getUsed()) / memoryUsage.getMax());
+        } while (currentUsage < targetUsage);
+        return list;
+    }
+
+    private MemoryPoolMXBean getMatchedMemoryPool(String patternPoolName) {
+        return ManagementFactory.getMemoryPoolMXBeans().stream()
+                .filter(bean -> bean.getName().matches(patternPoolName))
+                .findFirst()
+                .orElseThrow(() -> new RuntimeException("Cannot find '" + patternPoolName + "' memory pool."));
+    }
+
+    private List<Object> allocateGarbage(long targetMemoryUsage) {
+        List<Object> list = new ArrayList<>();
+        do {
+            try {
+                list.add(new byte[MEMORY_CHUNK]);
+            } catch (OutOfMemoryError e) {
+                list = null;
+                throw new RuntimeException("Unexpected OOME '" + e.getMessage() + "'");
+            }
+        } while (memoryMXBean.getHeapMemoryUsage().getUsed() < targetMemoryUsage);
+        return list;
+    }
+
+    /**
+     * Returns allocation rate for old gen based on appropriate MemoryPoolMXBean
+     * memory usage.
+     *
+     * @return allocation rate
+     */
+    public float getOldGenAllocationRatio() {
+        MemoryPoolMXBean oldGenBean = getMatchedMemoryPool(".*Old.*|.*Tenured.*");
+        MemoryUsage usage = oldGenBean.getUsage();
+        System.out.format("Memory usage for %1s.\n", oldGenBean.getName());
+        System.out.format("Used: %1d\n", usage.getUsed());
+        System.out.format("Commited: %1d\n", usage.getCommitted());
+        System.out.format("Max: %1d\n", usage.getMax());
+        return ((float) usage.getUsed()) / usage.getCommitted();
+    }
+}
--- a/hotspot/test/serviceability/tmtools/jstat/utils/GcProvoker.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/GcProvoker.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -22,9 +22,6 @@
  */
 package utils;
 
-import java.lang.management.ManagementFactory;
-import java.lang.management.MemoryPoolMXBean;
-import java.lang.management.MemoryUsage;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -36,11 +33,7 @@
 public class GcProvoker{
 
     // Uses fixed small objects to avoid Humongous objects allocation in G1
-    public static final int MEMORY_CHUNK = 2048;
-    public static final float ALLOCATION_TOLERANCE = 0.05f;
-
-    public static List<Object> allocatedMetaspace;
-    public static List<Object> allocatedMemory;
+    private static final int MEMORY_CHUNK = 2048;
 
     private final Runtime runtime;
 
@@ -61,21 +54,6 @@
         return list;
     }
 
-    private List<Object> allocateAvailableHeap(float targetUsage) {
-        // Calculates size of free memory after allocation with small tolerance.
-        long minFreeMemory = (long) ((1.0 - (targetUsage + ALLOCATION_TOLERANCE)) * runtime.maxMemory());
-        List<Object> list = new ArrayList<>();
-        do {
-            try {
-                list.add(new byte[MEMORY_CHUNK]);
-            } catch (OutOfMemoryError e) {
-                list = null;
-                throw new RuntimeException("Unexpected OOME '" + e.getMessage() + "' while eating " + targetUsage + " of heap memory.");
-            }
-        } while (runtime.freeMemory() > minFreeMemory);
-        return list;
-    }
-
     /**
      * This method provokes a GC
      */
@@ -93,65 +71,7 @@
         }
     }
 
-    /**
-     * Allocates heap and metaspace upon exit not less than targetMemoryUsagePercent percents
-     * of heap and metaspace have been consumed.
-     *
-     * @param targetMemoryUsagePercent how many percent of heap and metaspace to
-     * allocate
-     */
-
-    public void allocateMetaspaceAndHeap(float targetMemoryUsagePercent) {
-        // Metaspace should be filled before Java Heap to prevent unexpected OOME
-        // in the Java Heap while filling Metaspace
-        allocatedMetaspace = eatMetaspace(targetMemoryUsagePercent);
-        allocatedMemory = allocateHeap(targetMemoryUsagePercent);
-    }
-
-    /**
-     * Allocates heap and metaspace upon exit targetMemoryUsagePercent percents
-     * of heap and metaspace have been consumed.
-     *
-     * @param targetMemoryUsagePercent how many percent of heap and metaspace to
-     * allocate
-     */
-    public void allocateAvailableMetaspaceAndHeap(float targetMemoryUsagePercent) {
-        // Metaspace should be filled before Java Heap to prevent unexpected OOME
-        // in the Java Heap while filling Metaspace
-        allocatedMetaspace = eatMetaspace(targetMemoryUsagePercent);
-        allocatedMemory = allocateAvailableHeap(targetMemoryUsagePercent);
-    }
-
-    private List<Object> eatMetaspace(float targetUsage) {
-        List<Object> list = new ArrayList<>();
-        final String metaspacePoolName = "Metaspace";
-        MemoryPoolMXBean metaspacePool = null;
-        for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
-            if (pool.getName().contains(metaspacePoolName)) {
-                metaspacePool = pool;
-                break;
-            }
-        }
-        if (metaspacePool == null) {
-            throw new RuntimeException("MXBean for Metaspace pool wasn't found");
-        }
-        float currentUsage;
-        GeneratedClassProducer gp = new GeneratedClassProducer();
-        do {
-            try {
-                list.add(gp.create(0));
-            } catch (OutOfMemoryError oome) {
-                list = null;
-                throw new RuntimeException("Unexpected OOME '" + oome.getMessage() + "' while eating " + targetUsage + " of Metaspace.");
-            }
-            MemoryUsage memoryUsage = metaspacePool.getUsage();
-            currentUsage = (((float) memoryUsage.getUsed()) / memoryUsage.getMax());
-        } while (currentUsage < targetUsage);
-        return list;
-    }
-
     public GcProvoker() {
         runtime = Runtime.getRuntime();
     }
-
 }
--- a/hotspot/test/serviceability/tmtools/jstat/utils/GcProvokerImpl.java	Mon Jan 09 19:36:47 2017 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,113 +0,0 @@
-/*
- * Copyright (c) 2015, 2016, 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.
- */
-package utils;
-
-import java.lang.management.ManagementFactory;
-import java.lang.management.MemoryPoolMXBean;
-import java.lang.management.MemoryUsage;
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- *
- * Utilities to provoke GC in various ways
- */
-public class GcProvokerImpl implements GcProvoker {
-
-    private static List<Object> eatenMetaspace;
-    private static List<Object> eatenMemory;
-
-    static List<Object> eatHeapMemory(float targetUsage) {
-        long maxMemory = Runtime.getRuntime().maxMemory();
-        // uses fixed small objects to avoid Humongous objects allocation in G1
-        int memoryChunk = 2048;
-        List<Object> list = new ArrayList<>();
-        long used = 0;
-        long target = (long) (maxMemory * targetUsage);
-        while (used < target) {
-            try {
-                list.add(new byte[memoryChunk]);
-                used += memoryChunk;
-            } catch (OutOfMemoryError e) {
-                list = null;
-                throw new RuntimeException("Unexpected OOME '" + e.getMessage() + "' while eating " + targetUsage + " of heap memory.");
-            }
-        }
-        return list;
-    }
-
-    @Override
-    public void provokeGc() {
-        for (int i = 0; i < 3; i++) {
-            long edenSize = Pools.getEdenCommittedSize();
-            long heapSize = Pools.getHeapCommittedSize();
-            float targetPercent = ((float) edenSize) / (heapSize);
-            if ((targetPercent < 0) || (targetPercent > 1.0)) {
-                throw new RuntimeException("Error in the percent calculation" + " (eden size: " + edenSize + ", heap size: " + heapSize + ", calculated eden percent: " + targetPercent + ")");
-            }
-            eatHeapMemory(targetPercent);
-            eatHeapMemory(targetPercent);
-            System.gc();
-        }
-    }
-
-    @Override
-    public void eatMetaspaceAndHeap(float targetMemoryUsagePercent) {
-        // Metaspace should be filled before Java Heap to prevent unexpected OOME
-        // in the Java Heap while filling Metaspace
-        eatenMetaspace = eatMetaspace(targetMemoryUsagePercent);
-        eatenMemory = eatHeapMemory(targetMemoryUsagePercent);
-    }
-
-    private static List<Object> eatMetaspace(float targetUsage) {
-        List<Object> list = new ArrayList<>();
-        final String metaspacePoolName = "Metaspace";
-        MemoryPoolMXBean metaspacePool = null;
-        for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
-            if (pool.getName().contains(metaspacePoolName)) {
-                metaspacePool = pool;
-                break;
-            }
-        }
-        if (metaspacePool == null) {
-            throw new RuntimeException("MXBean for Metaspace pool wasn't found");
-        }
-        float currentUsage;
-        GeneratedClassProducer gp = new GeneratedClassProducer();
-        do {
-            try {
-                list.add(gp.create(0));
-            } catch (OutOfMemoryError oome) {
-                list = null;
-                throw new RuntimeException("Unexpected OOME '" + oome.getMessage() + "' while eating " + targetUsage + " of Metaspace.");
-            }
-            MemoryUsage memoryUsage = metaspacePool.getUsage();
-            currentUsage = (((float) memoryUsage.getUsed()) / memoryUsage.getMax());
-        } while (currentUsage < targetUsage);
-        return list;
-    }
-
-    public GcProvokerImpl() {
-    }
-
-}
--- a/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcCapacityResults.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcCapacityResults.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -62,6 +62,7 @@
     /**
      * Checks the overall consistency of the results reported by the tool
      */
+    @Override
     public void assertConsistency() {
 
         // Check exit code
@@ -117,8 +118,6 @@
         float MC = getFloatValue("MC");
         assertThat(MC >= MCMN, "MC < MCMN (generation capacity < min generation capacity)");
         assertThat(MC <= MCMX, "MGC > MCMX (generation capacity > max generation capacity)");
-
-
     }
 
     /**
@@ -139,21 +138,4 @@
         }
         return false;
     }
-
-    private static final float FLOAT_COMPARISON_TOLERANCE = 0.0011f;
-
-    private static boolean checkFloatIsSum(float sum, float... floats) {
-        for (float f : floats) {
-            sum -= f;
-        }
-
-        return Math.abs(sum) <= FLOAT_COMPARISON_TOLERANCE;
-    }
-
-    private void assertThat(boolean b, String message) {
-        if (!b) {
-            throw new RuntimeException(message);
-        }
-    }
-
 }
--- a/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcCauseResults.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcCauseResults.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -56,6 +56,7 @@
     /**
      * Checks the overall consistency of the results reported by the tool
      */
+    @Override
     public void assertConsistency() {
 
         assertThat(getExitCode() == 0, "Unexpected exit code: " + getExitCode());
@@ -83,21 +84,4 @@
         assertThat(checkFloatIsSum(GCT, YGCT, FGCT), "GCT != (YGCT + FGCT) " + "(GCT = " + GCT + ", YGCT = " + YGCT
                 + ", FGCT = " + FGCT + ", (YCGT + FGCT) = " + (YGCT + FGCT) + ")");
     }
-
-    private static final float FLOAT_COMPARISON_TOLERANCE = 0.0011f;
-
-    private static boolean checkFloatIsSum(float sum, float... floats) {
-        for (float f : floats) {
-            sum -= f;
-        }
-
-        return Math.abs(sum) <= FLOAT_COMPARISON_TOLERANCE;
-    }
-
-    private void assertThat(boolean b, String message) {
-        if (!b) {
-            throw new RuntimeException(message);
-        }
-    }
-
 }
--- a/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcNewResults.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcNewResults.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -54,6 +54,7 @@
     /**
      * Checks the overall consistency of the results reported by the tool
      */
+    @Override
     public void assertConsistency() {
 
         assertThat(getExitCode() == 0, "Unexpected exit code: " + getExitCode());
@@ -84,10 +85,4 @@
         int MTT = getIntValue("MTT");
         assertThat(TT <= MTT, "TT > MTT (tenuring threshold > maximum tenuring threshold)");
     }
-
-    private void assertThat(boolean b, String message) {
-        if (!b) {
-            throw new RuntimeException(message);
-        }
-    }
 }
--- a/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcResults.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/JstatGcResults.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -61,6 +61,7 @@
     /**
      * Checks the overall consistency of the results reported by the tool
      */
+    @Override
     public void assertConsistency() {
 
         assertThat(getExitCode() == 0, "Unexpected exit code: " + getExitCode());
@@ -112,21 +113,4 @@
         assertThat(checkFloatIsSum(GCT, YGCT, FGCT), "GCT != (YGCT + FGCT) " + "(GCT = " + GCT + ", YGCT = " + YGCT
                 + ", FGCT = " + FGCT + ", (YCGT + FGCT) = " + (YGCT + FGCT) + ")");
     }
-
-    private static final float FLOAT_COMPARISON_TOLERANCE = 0.0011f;
-
-    private static boolean checkFloatIsSum(float sum, float... floats) {
-        for (float f : floats) {
-            sum -= f;
-        }
-
-        return Math.abs(sum) <= FLOAT_COMPARISON_TOLERANCE;
-    }
-
-    private void assertThat(boolean b, String message) {
-        if (!b) {
-            throw new RuntimeException(message);
-        }
-    }
-
 }
--- a/hotspot/test/serviceability/tmtools/jstat/utils/JstatResults.java	Mon Jan 09 19:36:47 2017 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/JstatResults.java	Fri Feb 03 15:45:57 2017 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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
@@ -30,6 +30,8 @@
  */
 abstract public class JstatResults extends ToolResults {
 
+    private static final float FLOAT_COMPARISON_TOLERANCE = 0.0011f;
+
     public JstatResults(ToolResults rawResults) {
         super(rawResults);
     }
@@ -110,38 +112,61 @@
      * space has been utilized
      */
     public static void assertSpaceUtilization(JstatResults measurement, float targetMemoryUsagePercent) {
+        assertSpaceUtilization(measurement, targetMemoryUsagePercent, targetMemoryUsagePercent);
+    }
+
+    /**
+     * Helper function to assert the utilization of the space
+     *
+     * @param measurement - measurement results to analyze
+     * @param targetMetaspaceUsagePercent -assert that not less than this amount
+     * of metaspace has been utilized
+     * @param targetOldSpaceUsagePercent -assert that not less than this amount
+     * of old space has been utilized
+     */
+    public static void assertSpaceUtilization(JstatResults measurement, float targetMetaspaceUsagePercent,
+            float targetOldSpaceUsagePercent) {
 
         if (measurement.valueExists("OU")) {
             float OC = measurement.getFloatValue("OC");
             float OU = measurement.getFloatValue("OU");
-            assertThat((OU / OC) > targetMemoryUsagePercent, "Old space utilization should be > "
-                    + (targetMemoryUsagePercent * 100) + "%, actually OU / OC = " + (OU / OC));
+            assertThat((OU / OC) > targetOldSpaceUsagePercent, "Old space utilization should be > "
+                    + (targetOldSpaceUsagePercent * 100) + "%, actually OU / OC = " + (OU / OC));
         }
 
         if (measurement.valueExists("MU")) {
             float MC = measurement.getFloatValue("MC");
             float MU = measurement.getFloatValue("MU");
-            assertThat((MU / MC) > targetMemoryUsagePercent, "Metaspace utilization should be > "
-                    + (targetMemoryUsagePercent * 100) + "%, actually MU / MC = " + (MU / MC));
+            assertThat((MU / MC) > targetMetaspaceUsagePercent, "Metaspace utilization should be > "
+                    + (targetMetaspaceUsagePercent * 100) + "%, actually MU / MC = " + (MU / MC));
         }
 
         if (measurement.valueExists("O")) {
             float O = measurement.getFloatValue("O");
-            assertThat(O > targetMemoryUsagePercent * 100, "Old space utilization should be > "
-                    + (targetMemoryUsagePercent * 100) + "%, actually O = " + O);
+            assertThat(O > targetOldSpaceUsagePercent * 100, "Old space utilization should be > "
+                    + (targetOldSpaceUsagePercent * 100) + "%, actually O = " + O);
         }
 
         if (measurement.valueExists("M")) {
             float M = measurement.getFloatValue("M");
-            assertThat(M > targetMemoryUsagePercent * 100, "Metaspace utilization should be > "
-                    + (targetMemoryUsagePercent * 100) + "%, actually M = " + M);
+            assertThat(M > targetMetaspaceUsagePercent * 100, "Metaspace utilization should be > "
+                    + (targetMetaspaceUsagePercent * 100) + "%, actually M = " + M);
         }
     }
 
-    private static void assertThat(boolean result, String message) {
+    public static void assertThat(boolean result, String message) {
         if (!result) {
             throw new RuntimeException(message);
         }
     }
 
+    public static boolean checkFloatIsSum(float sum, float... floats) {
+        for (float f : floats) {
+            sum -= f;
+        }
+
+        return Math.abs(sum) <= FLOAT_COMPARISON_TOLERANCE;
+    }
+
+    abstract public void assertConsistency();
 }