test/serviceability/tmtools/jstat/utils/GcProvoker.java

*** 1,7 ****
  /*
!  * 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.
--- 1,7 ----
  /*
!  * 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 20,32 ****
   * 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;
  
  /**
   * This is an class used to provoke GC and perform other GC-related
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*** 35,48 ****
   */
  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 final Runtime runtime;
  
      private List<Object> allocateHeap(float targetUsage) {
          long maxMemory = runtime.maxMemory();
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*** 59,83 ****
              }
          }
          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
       */
      public void provokeGc() {
          for (int i = 0; i < 3; i++) {
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              allocateHeap(targetPercent);
              System.gc();
          }
      }
  
-     /**
-      * 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();
      }
- 
  }
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