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annotate src/share/vm/ci/ciReplay.hpp @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents 849eb7bfceac
children 4ca6dc0799b6
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_CI_CIREPLAY_HPP
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26 #define SHARE_VM_CI_CIREPLAY_HPP
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27
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28 #include "ci/ciMethod.hpp"
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29
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30 // ciReplay
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31
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32 //
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33 // Replay compilation of a java method by using an information in replay file.
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34 // Replay inlining decisions during compilation by using an information in inline file.
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35 //
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36 // NOTE: these replay functions only exist in debug version of VM.
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37 //
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38 // Replay compilation.
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39 // -------------------
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40 //
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41 // Replay data file replay.txt can be created by Serviceability Agent
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42 // from a core file, see agent/doc/cireplay.html
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43 //
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44 // $ java -cp <jdk>/lib/sa-jdi.jar sun.jvm.hotspot.CLHSDB
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45 // hsdb> attach <jdk>/bin/java ./core
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46 // hsdb> threads
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47 // t@10 Service Thread
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48 // t@9 C2 CompilerThread0
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49 // t@8 Signal Dispatcher
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50 // t@7 Finalizer
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51 // t@6 Reference Handler
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52 // t@2 main
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53 // hsdb> dumpreplaydata t@9 > replay.txt
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54 // hsdb> quit
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55 //
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56 // (Note: SA could be also used to extract app.jar and boot.jar files
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57 // from core file to replay compilation if only core file is available)
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58 //
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59 // Replay data file replay_pid%p.log is also created when VM crashes
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60 // in Compiler thread during compilation. It is controlled by
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61 // DumpReplayDataOnError flag which is ON by default.
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62 //
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63 // Replay file replay_pid%p_compid%d.log can be created
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64 // for the specified java method during normal execution using
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65 // CompileCommand option DumpReplay:
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66 //
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67 // -XX:CompileCommand=option,Benchmark::test,DumpReplay
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68 //
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69 // In this case the file name has additional compilation id "_compid%d"
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70 // because the method could be compiled several times.
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71 //
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72 // To replay compilation the replay file should be specified:
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73 //
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74 // -XX:+ReplayCompiles -XX:ReplayDataFile=replay_pid2133.log
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75 //
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76 // VM thread reads data from the file immediately after VM initialization
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77 // and puts the compilation task on compile queue. After that it goes into
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78 // wait state (BackgroundCompilation flag is set to false) since there is no
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79 // a program to execute. VM exits when the compilation is finished.
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80 //
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81 //
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82 // Replay inlining.
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83 // ----------------
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84 //
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85 // Replay inlining file inline_pid%p_compid%d.log is created for
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86 // a specific java method during normal execution of a java program
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87 // using CompileCommand option DumpInline:
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88 //
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89 // -XX:CompileCommand=option,Benchmark::test,DumpInline
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90 //
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91 // To replay inlining the replay file and the method should be specified:
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92 //
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93 // -XX:CompileCommand=option,Benchmark::test,ReplayInline -XX:InlineDataFile=inline_pid3244_compid6.log
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94 //
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95 // The difference from replay compilation is that replay inlining
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96 // is performed during normal java program execution.
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97 //
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98
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99 class ciReplay {
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100 CI_PACKAGE_ACCESS
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101
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102 #ifndef PRODUCT
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103 private:
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104 static int replay_impl(TRAPS);
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105
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106 public:
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107 // Replay specified compilation and exit VM.
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108 static void replay(TRAPS);
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109 // Load inlining decisions from file and use them
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110 // during compilation of specified method.
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111 static void* load_inline_data(ciMethod* method, int entry_bci, int comp_level);
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112
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113 // These are used by the CI to fill in the cached data from the
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114 // replay file when replaying compiles.
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115 static void initialize(ciMethodData* method);
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116 static void initialize(ciMethod* method);
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117
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118 static bool is_loaded(Method* method);
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119 static bool is_loaded(Klass* klass);
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120
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121 static bool should_not_inline(ciMethod* method);
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122 static bool should_inline(void* data, ciMethod* method, int bci, int inline_depth);
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123 static bool should_not_inline(void* data, ciMethod* method, int bci, int inline_depth);
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124
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125 #endif
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126 };
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127
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128 #endif // SHARE_VM_CI_CIREPLAY_HPP