Mercurial > hg > truffle
annotate src/share/vm/runtime/perfMemory.cpp @ 7212:291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Fri, 14 Dec 2012 14:35:13 +0100 |
| parents | b9a9ed0f8eeb |
| children | e89b54bf4e51 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
6842
b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
mikael
parents:
6197
diff
changeset
|
2 * Copyright (c) 2001, 2012, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
470
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
470
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
470
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "memory/allocation.inline.hpp" | |
| 27 #include "runtime/arguments.hpp" | |
| 28 #include "runtime/java.hpp" | |
| 29 #include "runtime/mutex.hpp" | |
| 30 #include "runtime/mutexLocker.hpp" | |
| 31 #include "runtime/os.hpp" | |
| 32 #include "runtime/perfData.hpp" | |
| 33 #include "runtime/perfMemory.hpp" | |
| 34 #include "runtime/statSampler.hpp" | |
| 35 #include "utilities/globalDefinitions.hpp" | |
| 0 | 36 |
| 434 | 37 // Prefix of performance data file. |
| 38 const char PERFDATA_NAME[] = "hsperfdata"; | |
| 39 | |
| 40 // Add 1 for the '_' character between PERFDATA_NAME and pid. The '\0' terminating | |
| 41 // character will be included in the sizeof(PERFDATA_NAME) operation. | |
| 42 static const size_t PERFDATA_FILENAME_LEN = sizeof(PERFDATA_NAME) + | |
| 43 UINT_CHARS + 1; | |
| 44 | |
| 0 | 45 char* PerfMemory::_start = NULL; |
| 46 char* PerfMemory::_end = NULL; | |
| 47 char* PerfMemory::_top = NULL; | |
| 48 size_t PerfMemory::_capacity = 0; | |
| 49 jint PerfMemory::_initialized = false; | |
| 50 PerfDataPrologue* PerfMemory::_prologue = NULL; | |
| 51 | |
| 52 void perfMemory_init() { | |
| 53 | |
| 54 if (!UsePerfData) return; | |
| 55 | |
| 56 PerfMemory::initialize(); | |
| 57 } | |
| 58 | |
| 59 void perfMemory_exit() { | |
| 60 | |
| 61 if (!UsePerfData) return; | |
| 62 if (!PerfMemory::is_initialized()) return; | |
| 63 | |
| 64 // if the StatSampler is active, then we don't want to remove | |
| 65 // resources it may be dependent on. Typically, the StatSampler | |
| 66 // is disengaged from the watcher thread when this method is called, | |
| 67 // but it is not disengaged if this method is invoked during a | |
| 68 // VM abort. | |
| 69 // | |
| 70 if (!StatSampler::is_active()) | |
| 71 PerfDataManager::destroy(); | |
| 72 | |
| 73 // remove the persistent external resources, if any. this method | |
| 74 // does not unmap or invalidate any virtual memory allocated during | |
| 75 // initialization. | |
| 76 // | |
| 77 PerfMemory::destroy(); | |
| 78 } | |
| 79 | |
| 80 void PerfMemory::initialize() { | |
| 81 | |
| 82 if (_prologue != NULL) | |
| 83 // initialization already performed | |
| 84 return; | |
| 85 | |
| 86 size_t capacity = align_size_up(PerfDataMemorySize, | |
| 87 os::vm_allocation_granularity()); | |
| 88 | |
| 89 if (PerfTraceMemOps) { | |
| 90 tty->print("PerfDataMemorySize = " SIZE_FORMAT "," | |
| 91 " os::vm_allocation_granularity = " SIZE_FORMAT "," | |
| 92 " adjusted size = " SIZE_FORMAT "\n", | |
| 93 PerfDataMemorySize, | |
| 94 os::vm_allocation_granularity(), | |
| 95 capacity); | |
| 96 } | |
| 97 | |
| 98 // allocate PerfData memory region | |
| 99 create_memory_region(capacity); | |
| 100 | |
| 101 if (_start == NULL) { | |
| 102 | |
| 103 // the PerfMemory region could not be created as desired. Rather | |
| 104 // than terminating the JVM, we revert to creating the instrumentation | |
| 105 // on the C heap. When running in this mode, external monitoring | |
| 106 // clients cannot attach to and monitor this JVM. | |
| 107 // | |
| 108 // the warning is issued only in debug mode in order to avoid | |
| 109 // additional output to the stdout or stderr output streams. | |
| 110 // | |
| 111 if (PrintMiscellaneous && Verbose) { | |
| 112 warning("Could not create PerfData Memory region, reverting to malloc"); | |
| 113 } | |
| 114 | |
| 6197 | 115 _prologue = NEW_C_HEAP_OBJ(PerfDataPrologue, mtInternal); |
| 0 | 116 } |
| 117 else { | |
| 118 | |
| 119 // the PerfMemory region was created as expected. | |
| 120 | |
| 121 if (PerfTraceMemOps) { | |
| 122 tty->print("PerfMemory created: address = " INTPTR_FORMAT "," | |
| 123 " size = " SIZE_FORMAT "\n", | |
| 124 (void*)_start, | |
| 125 _capacity); | |
| 126 } | |
| 127 | |
| 128 _prologue = (PerfDataPrologue *)_start; | |
| 129 _end = _start + _capacity; | |
| 130 _top = _start + sizeof(PerfDataPrologue); | |
| 131 } | |
| 132 | |
| 133 assert(_prologue != NULL, "prologue pointer must be initialized"); | |
| 134 | |
| 135 #ifdef VM_LITTLE_ENDIAN | |
| 136 _prologue->magic = (jint)0xc0c0feca; | |
| 137 _prologue->byte_order = PERFDATA_LITTLE_ENDIAN; | |
| 138 #else | |
| 139 _prologue->magic = (jint)0xcafec0c0; | |
| 140 _prologue->byte_order = PERFDATA_BIG_ENDIAN; | |
| 141 #endif | |
| 142 | |
| 143 _prologue->major_version = PERFDATA_MAJOR_VERSION; | |
| 144 _prologue->minor_version = PERFDATA_MINOR_VERSION; | |
| 145 _prologue->accessible = 0; | |
| 146 | |
| 147 _prologue->entry_offset = sizeof(PerfDataPrologue); | |
| 148 _prologue->num_entries = 0; | |
| 149 _prologue->used = 0; | |
| 150 _prologue->overflow = 0; | |
| 151 _prologue->mod_time_stamp = 0; | |
| 152 | |
| 153 OrderAccess::release_store(&_initialized, 1); | |
| 154 } | |
| 155 | |
| 156 void PerfMemory::destroy() { | |
| 157 | |
| 158 assert(_prologue != NULL, "prologue pointer must be initialized"); | |
| 159 | |
| 160 if (_start != NULL && _prologue->overflow != 0) { | |
| 161 | |
| 162 // This state indicates that the contiguous memory region exists and | |
| 163 // that it wasn't large enough to hold all the counters. In this case, | |
| 164 // we output a warning message to the user on exit if the -XX:+Verbose | |
| 165 // flag is set (a debug only flag). External monitoring tools can detect | |
| 166 // this condition by monitoring the _prologue->overflow word. | |
| 167 // | |
| 168 // There are two tunables that can help resolve this issue: | |
| 169 // - increase the size of the PerfMemory with -XX:PerfDataMemorySize=<n> | |
| 170 // - decrease the maximum string constant length with | |
| 171 // -XX:PerfMaxStringConstLength=<n> | |
| 172 // | |
| 173 if (PrintMiscellaneous && Verbose) { | |
| 174 warning("PerfMemory Overflow Occurred.\n" | |
| 175 "\tCapacity = " SIZE_FORMAT " bytes" | |
| 176 " Used = " SIZE_FORMAT " bytes" | |
| 177 " Overflow = " INT32_FORMAT " bytes" | |
| 178 "\n\tUse -XX:PerfDataMemorySize=<size> to specify larger size.", | |
| 179 PerfMemory::capacity(), | |
| 180 PerfMemory::used(), | |
| 181 _prologue->overflow); | |
| 182 } | |
| 183 } | |
| 184 | |
| 185 if (_start != NULL) { | |
| 186 | |
| 187 // this state indicates that the contiguous memory region was successfully | |
| 188 // and that persistent resources may need to be cleaned up. This is | |
| 189 // expected to be the typical condition. | |
| 190 // | |
| 191 delete_memory_region(); | |
| 192 } | |
| 193 | |
| 194 _start = NULL; | |
| 195 _end = NULL; | |
| 196 _top = NULL; | |
| 197 _prologue = NULL; | |
| 198 _capacity = 0; | |
| 199 } | |
| 200 | |
| 201 // allocate an aligned block of memory from the PerfData memory | |
| 202 // region. This method assumes that the PerfData memory region | |
| 203 // was aligned on a double word boundary when created. | |
| 204 // | |
| 205 char* PerfMemory::alloc(size_t size) { | |
| 206 | |
| 207 if (!UsePerfData) return NULL; | |
| 208 | |
| 209 MutexLocker ml(PerfDataMemAlloc_lock); | |
| 210 | |
| 211 assert(_prologue != NULL, "called before initialization"); | |
| 212 | |
| 213 // check that there is enough memory for this request | |
| 214 if ((_top + size) >= _end) { | |
| 215 | |
| 216 _prologue->overflow += (jint)size; | |
| 217 | |
| 218 return NULL; | |
| 219 } | |
| 220 | |
| 221 char* result = _top; | |
| 222 | |
| 223 _top += size; | |
| 224 | |
| 225 assert(contains(result), "PerfData memory pointer out of range"); | |
| 226 | |
| 227 _prologue->used = (jint)used(); | |
| 228 _prologue->num_entries = _prologue->num_entries + 1; | |
| 229 | |
| 230 return result; | |
| 231 } | |
| 232 | |
| 233 void PerfMemory::mark_updated() { | |
| 234 if (!UsePerfData) return; | |
| 235 | |
| 236 _prologue->mod_time_stamp = os::elapsed_counter(); | |
| 237 } | |
| 238 | |
| 239 // Returns the complete path including the file name of performance data file. | |
| 240 // Caller is expected to release the allocated memory. | |
| 241 char* PerfMemory::get_perfdata_file_path() { | |
| 242 char* dest_file = NULL; | |
| 243 | |
| 244 if (PerfDataSaveFile != NULL) { | |
| 245 // dest_file_name stores the validated file name if file_name | |
| 246 // contains %p which will be replaced by pid. | |
| 6197 | 247 dest_file = NEW_C_HEAP_ARRAY(char, JVM_MAXPATHLEN, mtInternal); |
| 0 | 248 if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile), |
| 249 dest_file, JVM_MAXPATHLEN)) { | |
| 6197 | 250 FREE_C_HEAP_ARRAY(char, dest_file, mtInternal); |
| 0 | 251 if (PrintMiscellaneous && Verbose) { |
| 252 warning("Invalid performance data file path name specified, "\ | |
| 253 "fall back to a default name"); | |
| 254 } | |
| 255 } else { | |
| 256 return dest_file; | |
| 257 } | |
| 258 } | |
| 259 // create the name of the file for retaining the instrumentation memory. | |
| 6197 | 260 dest_file = NEW_C_HEAP_ARRAY(char, PERFDATA_FILENAME_LEN, mtInternal); |
| 0 | 261 jio_snprintf(dest_file, PERFDATA_FILENAME_LEN, |
| 262 "%s_%d", PERFDATA_NAME, os::current_process_id()); | |
| 263 | |
| 264 return dest_file; | |
| 265 } |