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annotate src/share/vm/code/jvmticmlr.h @ 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 c18cbe5936b8
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1 /*
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2 * Copyright (c) 2010, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25
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26 /*
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27 * This header file defines the data structures sent by the VM
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28 * through the JVMTI CompiledMethodLoad callback function via the
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29 * "void * compile_info" parameter. The memory pointed to by the
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30 * compile_info parameter may not be referenced after returning from
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31 * the CompiledMethodLoad callback. These are VM implementation
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32 * specific data structures that may evolve in future releases. A
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33 * JVMTI agent should interpret a non-NULL compile_info as a pointer
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34 * to a region of memory containing a list of records. In a typical
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35 * usage scenario, a JVMTI agent would cast each record to a
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36 * jvmtiCompiledMethodLoadRecordHeader, a struct that represents
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37 * arbitrary information. This struct contains a kind field to indicate
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38 * the kind of information being passed, and a pointer to the next
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39 * record. If the kind field indicates inlining information, then the
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40 * agent would cast the record to a jvmtiCompiledMethodLoadInlineRecord.
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41 * This record contains an array of PCStackInfo structs, which indicate
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42 * for every pc address what are the methods on the invocation stack.
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43 * The "methods" and "bcis" fields in each PCStackInfo struct specify a
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44 * 1-1 mapping between these inlined methods and their bytecode indices.
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45 * This can be used to derive the proper source lines of the inlined
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46 * methods.
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47 */
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48
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49 #ifndef _JVMTI_CMLR_H_
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50 #define _JVMTI_CMLR_H_
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51
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52 enum {
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53 JVMTI_CMLR_MAJOR_VERSION_1 = 0x00000001,
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54 JVMTI_CMLR_MINOR_VERSION_0 = 0x00000000,
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55
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56 JVMTI_CMLR_MAJOR_VERSION = 0x00000001,
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57 JVMTI_CMLR_MINOR_VERSION = 0x00000000
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58
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59 /*
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60 * This comment is for the "JDK import from HotSpot" sanity check:
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61 * version: 1.0.0
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62 */
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63 };
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64
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65 typedef enum {
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66 JVMTI_CMLR_DUMMY = 1,
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67 JVMTI_CMLR_INLINE_INFO = 2
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68 } jvmtiCMLRKind;
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69
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70 /*
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71 * Record that represents arbitrary information passed through JVMTI
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72 * CompiledMethodLoadEvent void pointer.
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73 */
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74 typedef struct _jvmtiCompiledMethodLoadRecordHeader {
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75 jvmtiCMLRKind kind; /* id for the kind of info passed in the record */
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76 jint majorinfoversion; /* major and minor info version values. Init'ed */
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77 jint minorinfoversion; /* to current version value in jvmtiExport.cpp. */
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78
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79 struct _jvmtiCompiledMethodLoadRecordHeader* next;
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80 } jvmtiCompiledMethodLoadRecordHeader;
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81
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82 /*
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83 * Record that gives information about the methods on the compile-time
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84 * stack at a specific pc address of a compiled method. Each element in
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85 * the methods array maps to same element in the bcis array.
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86 */
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87 typedef struct _PCStackInfo {
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88 void* pc; /* the pc address for this compiled method */
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89 jint numstackframes; /* number of methods on the stack */
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90 jmethodID* methods; /* array of numstackframes method ids */
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91 jint* bcis; /* array of numstackframes bytecode indices */
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92 } PCStackInfo;
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93
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94 /*
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95 * Record that contains inlining information for each pc address of
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96 * an nmethod.
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97 */
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98 typedef struct _jvmtiCompiledMethodLoadInlineRecord {
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99 jvmtiCompiledMethodLoadRecordHeader header; /* common header for casting */
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100 jint numpcs; /* number of pc descriptors in this nmethod */
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101 PCStackInfo* pcinfo; /* array of numpcs pc descriptors */
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102 } jvmtiCompiledMethodLoadInlineRecord;
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103
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104 /*
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105 * Dummy record used to test that we can pass records with different
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106 * information through the void pointer provided that they can be cast
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107 * to a jvmtiCompiledMethodLoadRecordHeader.
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108 */
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109
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110 typedef struct _jvmtiCompiledMethodLoadDummyRecord {
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111 jvmtiCompiledMethodLoadRecordHeader header; /* common header for casting */
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112 char message[50];
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113 } jvmtiCompiledMethodLoadDummyRecord;
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114
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115 #endif