1 /*
   2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2020 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 import java.util.*;
  27 
  28 public class AllocationProfile {
  29 
  30     final String name;
  31 
  32     // Allocation word size spread
  33     public final long minimumSingleAllocationSize;
  34     public final long maximumSingleAllocationSize;
  35 
  36     // dealloc probability [0.0 .. 1.0]
  37     public final double randomDeallocProbability;
  38 
  39     public AllocationProfile(String name, long minimumSingleAllocationSize, long maximumSingleAllocationSize, double randomDeallocProbability) {
  40         this.minimumSingleAllocationSize = minimumSingleAllocationSize;
  41         this.maximumSingleAllocationSize = maximumSingleAllocationSize;
  42         this.randomDeallocProbability = randomDeallocProbability;
  43         this.name = name;
  44     }
  45 
  46     public long randomAllocationSize() {
  47         Random r = new Random();
  48         return r.nextInt((int)(maximumSingleAllocationSize - minimumSingleAllocationSize + 1)) + minimumSingleAllocationSize;
  49     }
  50 
  51 
  52     // Some standard profiles
  53     static final List<AllocationProfile> standardProfiles = new ArrayList<>();
  54 
  55     static {
  56         standardProfiles.add(new AllocationProfile("medium-range",1, 2048, 0.15));
  57         standardProfiles.add(new AllocationProfile("small-blocks",1, 512, 0.15));
  58         standardProfiles.add(new AllocationProfile("micro-blocks",1, 32, 0.15));
  59     }
  60 
  61     static AllocationProfile randomProfile() {
  62         return standardProfiles.get(RandomHelper.random().nextInt(standardProfiles.size()));
  63     }
  64 
  65     @Override
  66     public String toString() {
  67         return "MetaspaceTestAllocationProfile{" +
  68                 "name='" + name + '\'' +
  69                 ", minimumSingleAllocationSize=" + minimumSingleAllocationSize +
  70                 ", maximumSingleAllocationSize=" + maximumSingleAllocationSize +
  71                 ", randomDeallocProbability=" + randomDeallocProbability +
  72                 '}';
  73     }
  74 
  75 }