1 /*
   2  * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test InitialAndMaxUsageTest
  26  * @summary testing of initial and max usage
  27  * @modules java.base/jdk.internal.misc
  28  *          java.management
  29  * @library /test/lib /
  30  *
  31  * @build sun.hotspot.WhiteBox
  32  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  33  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  34  * @run main/othervm -Xbootclasspath/a:. -XX:-UseCodeCacheFlushing
  35  *     -XX:-MethodFlushing -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  36  *     -XX:CompileCommand=compileonly,null::* -XX:-UseLargePages
  37  *     -XX:+SegmentedCodeCache
  38  *     compiler.codecache.jmx.InitialAndMaxUsageTest
  39  * @run main/othervm -Xbootclasspath/a:. -XX:-UseCodeCacheFlushing
  40  *     -XX:-MethodFlushing -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  41  *     -XX:CompileCommand=compileonly,null::* -XX:-UseLargePages
  42  *     -XX:-SegmentedCodeCache
  43  *     compiler.codecache.jmx.InitialAndMaxUsageTest
  44  */
  45 
  46 package compiler.codecache.jmx;
  47 
  48 import jdk.test.lib.Asserts;
  49 import sun.hotspot.code.BlobType;
  50 
  51 import java.lang.management.MemoryPoolMXBean;
  52 import java.util.ArrayList;
  53 import java.util.List;
  54 
  55 public class InitialAndMaxUsageTest {
  56 
  57     private static final double CACHE_USAGE_COEF = 0.95d;
  58     private final BlobType btype;
  59     private final boolean lowerBoundIsZero;
  60     private final long maxSize;
  61 
  62     public InitialAndMaxUsageTest(BlobType btype) {
  63         this.btype = btype;
  64         this.maxSize = btype.getSize();
  65         /* Only profiled code cache initial size should be 0, because of
  66          -XX:CompileCommand=compileonly,null::* non-methods might be not empty,
  67          as well as non-profiled methods, because it's used as fallback in
  68          case non-methods is full */
  69         lowerBoundIsZero = btype == BlobType.MethodProfiled;
  70     }
  71 
  72     public static void main(String[] args) {
  73         for (BlobType btype : BlobType.getAvailable()) {
  74             new InitialAndMaxUsageTest(btype).runTest();
  75         }
  76     }
  77 
  78     private void fillWithSize(long size, List<Long> blobs, MemoryPoolMXBean bean) {
  79         long blob;
  80         /* Don't fill too much to have space for adapters. So, stop after crossing 95% and
  81            don't allocate in case we'll cross 97% on next allocation. We can hit situation
  82            like 94% -> (1 allocation) -> 100% otherwise. So, check if
  83            <Usage + allocatedSize> is less than 97%, then allocate in case it is, then, stop
  84            further allocations with given size in case <Usage> more than 95% */
  85         while (((double) bean.getUsage().getUsed() + size <= (CACHE_USAGE_COEF + 0.02d)  * maxSize)
  86                 && (blob = CodeCacheUtils.WB.allocateCodeBlob(size, btype.id)) != 0L
  87                 && ((double) bean.getUsage().getUsed() <= CACHE_USAGE_COEF * maxSize)) {
  88             blobs.add(blob);
  89         }
  90     }
  91 
  92     protected void runTest() {
  93         long headerSize = CodeCacheUtils.getHeaderSize(btype);
  94         MemoryPoolMXBean bean = btype.getMemoryPool();
  95         long initialUsage = btype.getMemoryPool().getUsage().getUsed();
  96         System.out.printf("INFO: trying to test %s of max size %d and initial"
  97                 + " usage %d%n", bean.getName(), maxSize, initialUsage);
  98         Asserts.assertLT(initialUsage + headerSize + 1L, maxSize,
  99                 "Initial usage is close to total size for " + bean.getName());
 100         if (lowerBoundIsZero) {
 101             Asserts.assertEQ(initialUsage, 0L, "Unexpected initial usage");
 102         }
 103         ArrayList<Long> blobs = new ArrayList<>();
 104         long minAllocationUnit = Math.max(1, CodeCacheUtils.MIN_ALLOCATION - headerSize);
 105         /* now filling code cache with large-sized allocation first, since
 106          lots of small allocations takes too much time, so, just a small
 107          optimization */
 108         try {
 109             for (int coef = 1000000; coef > 0; coef /= 10) {
 110                 fillWithSize(coef * minAllocationUnit, blobs, bean);
 111             }
 112             Asserts.assertGT((double) bean.getUsage().getUsed(),
 113                     CACHE_USAGE_COEF * maxSize, String.format("Unable to fill "
 114                             + "more than %f of %s. Reported usage is %d ",
 115                             CACHE_USAGE_COEF, bean.getName(),
 116                             bean.getUsage().getUsed()));
 117         } finally {
 118             for (long entry : blobs) {
 119                 CodeCacheUtils.WB.freeCodeBlob(entry);
 120             }
 121         }
 122         System.out.printf("INFO: Scenario finished successfully for %s%n",
 123                 bean.getName());
 124     }
 125 
 126 }