Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/perfMemory.hpp @ 10241:d17700c82d7d
8006088: Incompatible heap size flags accepted by VM
Summary: Make processing of minimum, initial and maximum heap size more intiutive by removing previous limitations on allowed values, and make error reporting consistent. Further, fix errors in ergonomic heap sizing.
Reviewed-by: johnc, jwilhelm, tamao
| author | tschatzl |
|---|---|
| date | Mon, 06 May 2013 17:19:42 +0200 |
| parents | f95d63e2154a |
| children | 63a4eb8bcd23 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_PERFMEMORY_HPP |
| 26 #define SHARE_VM_RUNTIME_PERFMEMORY_HPP | |
| 27 | |
| 28 #include "utilities/exceptions.hpp" | |
| 29 | |
| 0 | 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. | |
| 434 | 103 extern const char PERFDATA_NAME[]; |
| 0 | 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(); | |
| 1972 | 168 |
| 169 #endif // SHARE_VM_RUNTIME_PERFMEMORY_HPP |