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comparison: src/share/vm/runtime/perfMemory.hpp
src/share/vm/runtime/perfMemory.hpp
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| 1 /* | |
| 2 * Copyright (c) 2001, 2010, 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 #ifndef SHARE_VM_RUNTIME_PERFMEMORY_HPP | |
| 26 #define SHARE_VM_RUNTIME_PERFMEMORY_HPP | |
| 27 | |
| 28 #include "utilities/exceptions.hpp" | |
| 29 | |
| 30 /* | |
| 31 * PerfData Version Constants | |
| 32 * - Major Version - change whenever the structure of PerfDataEntry changes | |
| 33 * - Minor Version - change whenever the data within the PerfDataEntry | |
| 34 * structure changes. for example, new unit or variability | |
| 35 * values are added or new PerfData subtypes are added. | |
| 36 */ | |
| 37 #define PERFDATA_MAJOR_VERSION 2 | |
| 38 #define PERFDATA_MINOR_VERSION 0 | |
| 39 | |
| 40 /* Byte order of the PerfData memory region. The byte order is exposed in | |
| 41 * the PerfData memory region as the data in the memory region may have | |
| 42 * been generated by a little endian JVM implementation. Tracking the byte | |
| 43 * order in the PerfData memory region allows Java applications to adapt | |
| 44 * to the native byte order for monitoring purposes. This indicator is | |
| 45 * also useful when a snapshot of the PerfData memory region is shipped | |
| 46 * to a machine with a native byte order different from that of the | |
| 47 * originating machine. | |
| 48 */ | |
| 49 #define PERFDATA_BIG_ENDIAN 0 | |
| 50 #define PERFDATA_LITTLE_ENDIAN 1 | |
| 51 | |
| 52 /* | |
| 53 * The PerfDataPrologue structure is known by the PerfDataBuffer Java class | |
| 54 * libraries that read the PerfData memory region. The size and the position | |
| 55 * of the fields must be changed along with their counterparts in the | |
| 56 * PerfDataBuffer Java class. The first four bytes of this structure | |
| 57 * should never change, or compatibility problems between the monitoring | |
| 58 * applications and Hotspot VMs will result. The reserved fields are | |
| 59 * available for future enhancements. | |
| 60 */ | |
| 61 typedef struct { | |
| 62 jint magic; // magic number - 0xcafec0c0 | |
| 63 jbyte byte_order; // byte order of the buffer | |
| 64 jbyte major_version; // major and minor version numbers | |
| 65 jbyte minor_version; | |
| 66 jbyte accessible; // ready to access | |
| 67 jint used; // number of PerfData memory bytes used | |
| 68 jint overflow; // number of bytes of overflow | |
| 69 jlong mod_time_stamp; // time stamp of last structural modification | |
| 70 jint entry_offset; // offset of the first PerfDataEntry | |
| 71 jint num_entries; // number of allocated PerfData entries | |
| 72 } PerfDataPrologue; | |
| 73 | |
| 74 /* The PerfDataEntry structure defines the fixed portion of an entry | |
| 75 * in the PerfData memory region. The PerfDataBuffer Java libraries | |
| 76 * are aware of this structure and need to be changed when this | |
| 77 * structure changes. | |
| 78 */ | |
| 79 typedef struct { | |
| 80 | |
| 81 jint entry_length; // entry length in bytes | |
| 82 jint name_offset; // offset of the data item name | |
| 83 jint vector_length; // length of the vector. If 0, then scalar | |
| 84 jbyte data_type; // type of the data item - | |
| 85 // 'B','Z','J','I','S','C','D','F','V','L','[' | |
| 86 jbyte flags; // flags indicating misc attributes | |
| 87 jbyte data_units; // unit of measure for the data type | |
| 88 jbyte data_variability; // variability classification of data type | |
| 89 jint data_offset; // offset of the data item | |
| 90 | |
| 91 /* | |
| 92 body of PerfData memory entry is variable length | |
| 93 | |
| 94 jbyte[name_length] data_name; // name of the data item | |
| 95 jbyte[pad_length] data_pad; // alignment of data item | |
| 96 j<data_type>[data_length] data_item; // array of appropriate types. | |
| 97 // data_length is > 1 only when the | |
| 98 // data_type is T_ARRAY. | |
| 99 */ | |
| 100 } PerfDataEntry; | |
| 101 | |
| 102 // Prefix of performance data file. | |
| 103 extern const char PERFDATA_NAME[]; | |
| 104 | |
| 105 // UINT_CHARS contains the number of characters holding a process id | |
| 106 // (i.e. pid). pid is defined as unsigned "int" so the maximum possible pid value | |
| 107 // would be 2^32 - 1 (4294967295) which can be represented as a 10 characters | |
| 108 // string. | |
| 109 static const size_t UINT_CHARS = 10; | |
| 110 | |
| 111 /* the PerfMemory class manages creation, destruction, | |
| 112 * and allocation of the PerfData region. | |
| 113 */ | |
| 114 class PerfMemory : AllStatic { | |
| 115 friend class VMStructs; | |
| 116 private: | |
| 117 static char* _start; | |
| 118 static char* _end; | |
| 119 static char* _top; | |
| 120 static size_t _capacity; | |
| 121 static PerfDataPrologue* _prologue; | |
| 122 static jint _initialized; | |
| 123 | |
| 124 static void create_memory_region(size_t sizep); | |
| 125 static void delete_memory_region(); | |
| 126 | |
| 127 public: | |
| 128 enum PerfMemoryMode { | |
| 129 PERF_MODE_RO = 0, | |
| 130 PERF_MODE_RW = 1 | |
| 131 }; | |
| 132 | |
| 133 static char* alloc(size_t size); | |
| 134 static char* start() { return _start; } | |
| 135 static char* end() { return _end; } | |
| 136 static size_t used() { return (size_t) (_top - _start); } | |
| 137 static size_t capacity() { return _capacity; } | |
| 138 static bool is_initialized() { return _initialized != 0; } | |
| 139 static bool contains(char* addr) { | |
| 140 return ((_start != NULL) && (addr >= _start) && (addr < _end)); | |
| 141 } | |
| 142 static void mark_updated(); | |
| 143 | |
| 144 // methods for attaching to and detaching from the PerfData | |
| 145 // memory segment of another JVM process on the same system. | |
| 146 static void attach(const char* user, int vmid, PerfMemoryMode mode, | |
| 147 char** addrp, size_t* size, TRAPS); | |
| 148 static void detach(char* addr, size_t bytes, TRAPS); | |
| 149 | |
| 150 static void initialize(); | |
| 151 static void destroy(); | |
| 152 static void set_accessible(bool value) { | |
| 153 if (UsePerfData) { | |
| 154 _prologue->accessible = value; | |
| 155 } | |
| 156 } | |
| 157 | |
| 158 // filename of backing store or NULL if none. | |
| 159 static char* backing_store_filename(); | |
| 160 | |
| 161 // returns the complete file path of hsperfdata. | |
| 162 // the caller is expected to free the allocated memory. | |
| 163 static char* get_perfdata_file_path(); | |
| 164 }; | |
| 165 | |
| 166 void perfMemory_init(); | |
| 167 void perfMemory_exit(); | |
| 168 | |
| 169 #endif // SHARE_VM_RUNTIME_PERFMEMORY_HPP |
