1 /*
   2  * Copyright (c) 2014, 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 com.oracle.java.testlibrary.*;
  25 import sun.hotspot.WhiteBox;
  26 
  27 /*
  28  * @test CheckSegmentedCodeCache
  29  * @bug 8015774
  30  * @library /testlibrary /../../test/lib
  31  * @summary "Checks VM options related to the segmented code cache"
  32  * @build CheckSegmentedCodeCache
  33  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  34  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  35  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI CheckSegmentedCodeCache
  36  */
  37 public class CheckSegmentedCodeCache {
  38   private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
  39   // Code heap names
  40   private static final String NON_METHOD = "CodeHeap 'non-nmethods'";
  41   private static final String PROFILED = "CodeHeap 'profiled nmethods'";
  42   private static final String NON_PROFILED = "CodeHeap 'non-profiled nmethods'";
  43 
  44   private static void verifySegmentedCodeCache(ProcessBuilder pb, boolean enabled) throws Exception {
  45     OutputAnalyzer out = new OutputAnalyzer(pb.start());
  46     out.shouldHaveExitValue(0);
  47     if (enabled) {
  48       try {
  49         // Non-nmethod code heap should be always available with the segmented code cache
  50         out.shouldContain(NON_METHOD);
  51       } catch (RuntimeException e) {
  52         // Check if TieredCompilation is disabled (in a client VM)
  53         if(!out.getOutput().contains("TieredCompilation is disabled in this release.")) {
  54           // Code cache is not segmented
  55           throw new RuntimeException("No code cache segmentation.");
  56         }
  57       }
  58     } else {
  59       out.shouldNotContain(NON_METHOD);
  60     }
  61   }
  62 
  63   private static void verifyCodeHeapNotExists(ProcessBuilder pb, String... heapNames) throws Exception {
  64     OutputAnalyzer out = new OutputAnalyzer(pb.start());
  65     out.shouldHaveExitValue(0);
  66     for (String name : heapNames) {
  67       out.shouldNotContain(name);
  68     }
  69   }
  70 
  71   private static void failsWith(ProcessBuilder pb, String message) throws Exception {
  72     OutputAnalyzer out = new OutputAnalyzer(pb.start());
  73     out.shouldContain(message);
  74     out.shouldHaveExitValue(1);
  75   }
  76 
  77   /**
  78    * Check the result of segmented code cache related VM options.
  79    */
  80   public static void main(String[] args) throws Exception {
  81     ProcessBuilder pb;
  82 
  83     // Disabled with ReservedCodeCacheSize < 240MB
  84     pb = ProcessTools.createJavaProcessBuilder("-XX:ReservedCodeCacheSize=239m",
  85                                                "-XX:+PrintCodeCache", "-version");
  86     verifySegmentedCodeCache(pb, false);
  87 
  88     // Disabled without TieredCompilation
  89     pb = ProcessTools.createJavaProcessBuilder("-XX:-TieredCompilation",
  90                                                "-XX:+PrintCodeCache", "-version");
  91     verifySegmentedCodeCache(pb, false);
  92 
  93     // Enabled with TieredCompilation and ReservedCodeCacheSize >= 240MB
  94     pb = ProcessTools.createJavaProcessBuilder("-XX:+TieredCompilation",
  95                                                "-XX:ReservedCodeCacheSize=240m",
  96                                                "-XX:+PrintCodeCache", "-version");
  97     verifySegmentedCodeCache(pb, true);
  98     pb = ProcessTools.createJavaProcessBuilder("-XX:+TieredCompilation",
  99                                                "-XX:ReservedCodeCacheSize=400m",
 100                                                "-XX:+PrintCodeCache", "-version");
 101     verifySegmentedCodeCache(pb, true);
 102 
 103     // Always enabled if SegmentedCodeCache is set
 104     pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
 105                                                "-XX:-TieredCompilation",
 106                                                "-XX:ReservedCodeCacheSize=239m",
 107                                                "-XX:+PrintCodeCache", "-version");
 108     verifySegmentedCodeCache(pb, true);
 109 
 110     // The profiled and non-profiled code heaps should not be available in
 111     // interpreter-only mode
 112     pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
 113                                                "-Xint",
 114                                                "-XX:+PrintCodeCache", "-version");
 115     verifyCodeHeapNotExists(pb, PROFILED, NON_PROFILED);
 116 
 117     // If we stop compilation at CompLevel_none or CompLevel_simple we
 118     // don't need a profiled code heap.
 119     pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
 120                                                "-XX:TieredStopAtLevel=0",
 121                                                "-XX:+PrintCodeCache", "-version");
 122     verifyCodeHeapNotExists(pb, PROFILED);
 123     pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
 124                                                "-XX:TieredStopAtLevel=1",
 125                                                "-XX:+PrintCodeCache", "-version");
 126     verifyCodeHeapNotExists(pb, PROFILED);
 127 
 128     // Fails with too small non-nmethod code heap size
 129     pb = ProcessTools.createJavaProcessBuilder("-XX:NonNMethodCodeHeapSize=100K");
 130     failsWith(pb, "Invalid NonNMethodCodeHeapSize");
 131 
 132     // Fails if code heap sizes do not add up
 133     pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
 134                                                "-XX:ReservedCodeCacheSize=10M",
 135                                                "-XX:NonNMethodCodeHeapSize=5M",
 136                                                "-XX:ProfiledCodeHeapSize=5M",
 137                                                "-XX:NonProfiledCodeHeapSize=5M");
 138     failsWith(pb, "Invalid code heap sizes");
 139 
 140     // Fails if not enough space for VM internal code
 141     long minUseSpace = WHITE_BOX.getUintxVMFlag("CodeCacheMinimumUseSpace");
 142     // minimum size: CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)
 143     long minSize = (Platform.isDebugBuild() ? 3 : 1) * minUseSpace;
 144     pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
 145                                                "-XX:ReservedCodeCacheSize=" + minSize,
 146                                                "-XX:InitialCodeCacheSize=100K");
 147     failsWith(pb, "Not enough space in non-nmethod code heap to run VM");
 148   }
 149 }