1 /*
   2  * Copyright (c) 2014, 2015, 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 import jdk.test.lib.Asserts;
  25 import jdk.test.lib.Utils;
  26 import java.lang.management.MemoryPoolMXBean;
  27 import javax.management.Notification;
  28 import sun.hotspot.WhiteBox;
  29 import sun.hotspot.code.BlobType;
  30 import sun.hotspot.code.CodeBlob;
  31 
  32 public final class CodeCacheUtils {
  33 
  34     /**
  35     * Returns the value to be used for code heap allocation
  36     */
  37     public static final int ALLOCATION_SIZE
  38             = Integer.getInteger("codecache.allocation.size", 100);
  39     public static final WhiteBox WB = WhiteBox.getWhiteBox();
  40     public static final long SEGMENT_SIZE
  41             = WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheSegmentSize");
  42     public static final long MIN_BLOCK_LENGTH
  43             = WhiteBox.getWhiteBox().getUintxVMFlag("CodeCacheMinBlockLength");
  44     public static final long MIN_ALLOCATION = SEGMENT_SIZE * MIN_BLOCK_LENGTH;
  45 
  46     private CodeCacheUtils() {
  47         // To prevent from instantiation
  48     }
  49 
  50     public static final void hitUsageThreshold(MemoryPoolMXBean bean,
  51             BlobType btype) {
  52         long initialSize = bean.getUsage().getUsed();
  53         bean.setUsageThreshold(initialSize + 1);
  54         long usageThresholdCount = bean.getUsageThresholdCount();
  55         long addr = WB.allocateCodeBlob(1, btype.id);
  56         WB.fullGC();
  57         Utils.waitForCondition(()
  58                 -> bean.getUsageThresholdCount() == usageThresholdCount + 1);
  59         WB.freeCodeBlob(addr);
  60     }
  61 
  62     public static final long getHeaderSize(BlobType btype) {
  63         long addr = WB.allocateCodeBlob(0, btype.id);
  64         int size = CodeBlob.getCodeBlob(addr).size;
  65         WB.freeCodeBlob(addr);
  66         return size;
  67     }
  68 
  69     public static String getPoolNameFromNotification(
  70             Notification notification) {
  71         return ((javax.management.openmbean.CompositeDataSupport)
  72                 notification.getUserData()).get("poolName").toString();
  73     }
  74 
  75     public static boolean isAvailableCodeHeapPoolName(String name) {
  76         return BlobType.getAvailable().stream()
  77                 .map(BlobType::getMemoryPool)
  78                 .map(MemoryPoolMXBean::getName)
  79                 .filter(name::equals)
  80                 .findAny().isPresent();
  81     }
  82 
  83     /**
  84      * Checks if the usage of the code heap corresponding to 'btype' can be
  85      * predicted at runtime if we disable compilation. The usage of the
  86      * 'NonNMethod' code heap can not be predicted because we generate adapters
  87      * and buffers at runtime. The 'MethodNonProfiled' code heap is also not
  88      * predictable because we may generate compiled versions of method handle
  89      * intrinsics while resolving methods at runtime. Same applies to 'All'.
  90      *
  91      * @param btype BlobType to be checked
  92      * @return boolean value, true if respective code heap is predictable
  93      */
  94     public static boolean isCodeHeapPredictable(BlobType btype) {
  95         return btype == BlobType.MethodProfiled;
  96     }
  97 
  98     /**
  99      * Verifies that 'newValue' is equal to 'oldValue' if usage of the
 100      * corresponding code heap is predictable. Checks the weaker condition
 101      * 'newValue >= oldValue' if usage is not predictable because intermediate
 102      * allocations may happen.
 103      *
 104      * @param btype BlobType of the code heap to be checked
 105      * @param newValue New value to be verified
 106      * @param oldValue Old value to be verified
 107      * @param msg Error message if verification fails
 108      */
 109     public static void assertEQorGTE(BlobType btype, long newValue, long oldValue, String msg) {
 110         if (CodeCacheUtils.isCodeHeapPredictable(btype)) {
 111             // Usage is predictable, check strong == condition
 112             Asserts.assertEQ(newValue, oldValue, msg);
 113         } else {
 114             // Usage is not predictable, check weaker >= condition
 115             Asserts.assertGTE(newValue, oldValue, msg);
 116         }
 117     }
 118 
 119     public static void disableCollectionUsageThresholds() {
 120         BlobType.getAvailable().stream()
 121                 .map(BlobType::getMemoryPool)
 122                 .filter(MemoryPoolMXBean::isCollectionUsageThresholdSupported)
 123                 .forEach(b -> b.setCollectionUsageThreshold(0L));
 124     }
 125 }