Mercurial > hg > truffle
annotate src/share/vm/services/attachListener.cpp @ 615:c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
Summary: Call newly created CollectedHeap::dump_{pre,post}_full_gc before and after every stop-world full collection cycle on GenCollectedHeap and ParallelScavengeHeap. (Support for G1CollectedHeap forthcoming under CR 6810861.) Small modifications to existing heap dumping and class histogram implementation, especially to allow multiple on-the-fly histos/dumps by the VM thread during a single safepoint.
Reviewed-by: jmasa, alanb, mchung
| author | ysr |
|---|---|
| date | Mon, 02 Mar 2009 16:37:04 -0800 |
| parents | a61af66fc99e |
| children | ba7ea42fc66e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2005-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_attachListener.cpp.incl" | |
| 27 | |
| 28 volatile bool AttachListener::_initialized; | |
| 29 | |
| 30 // Implementation of "properties" command. | |
| 31 // | |
| 32 // Invokes sun.misc.VMSupport.serializePropertiesToByteArray to serialize | |
| 33 // the system properties into a byte array. | |
| 34 | |
| 35 static klassOop load_and_initialize_klass(symbolHandle sh, TRAPS) { | |
| 36 klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL); | |
| 37 instanceKlassHandle ik (THREAD, k); | |
| 38 if (ik->should_be_initialized()) { | |
| 39 ik->initialize(CHECK_NULL); | |
| 40 } | |
| 41 return ik(); | |
| 42 } | |
| 43 | |
| 44 static jint get_properties(AttachOperation* op, outputStream* out, symbolHandle serializePropertiesMethod) { | |
| 45 Thread* THREAD = Thread::current(); | |
| 46 HandleMark hm; | |
| 47 | |
| 48 // load sun.misc.VMSupport | |
| 49 symbolHandle klass = vmSymbolHandles::sun_misc_VMSupport(); | |
| 50 klassOop k = load_and_initialize_klass(klass, THREAD); | |
| 51 if (HAS_PENDING_EXCEPTION) { | |
| 52 java_lang_Throwable::print(PENDING_EXCEPTION, out); | |
| 53 CLEAR_PENDING_EXCEPTION; | |
| 54 return JNI_ERR; | |
| 55 } | |
| 56 instanceKlassHandle ik(THREAD, k); | |
| 57 | |
| 58 // invoke the serializePropertiesToByteArray method | |
| 59 JavaValue result(T_OBJECT); | |
| 60 JavaCallArguments args; | |
| 61 | |
| 62 | |
| 63 symbolHandle signature = vmSymbolHandles::serializePropertiesToByteArray_signature(); | |
| 64 JavaCalls::call_static(&result, | |
| 65 ik, | |
| 66 serializePropertiesMethod, | |
| 67 signature, | |
| 68 &args, | |
| 69 THREAD); | |
| 70 if (HAS_PENDING_EXCEPTION) { | |
| 71 java_lang_Throwable::print(PENDING_EXCEPTION, out); | |
| 72 CLEAR_PENDING_EXCEPTION; | |
| 73 return JNI_ERR; | |
| 74 } | |
| 75 | |
| 76 // The result should be a [B | |
| 77 oop res = (oop)result.get_jobject(); | |
| 78 assert(res->is_typeArray(), "just checking"); | |
| 79 assert(typeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking"); | |
| 80 | |
| 81 // copy the bytes to the output stream | |
| 82 typeArrayOop ba = typeArrayOop(res); | |
| 83 jbyte* addr = typeArrayOop(res)->byte_at_addr(0); | |
| 84 out->print_raw((const char*)addr, ba->length()); | |
| 85 | |
| 86 return JNI_OK; | |
| 87 } | |
| 88 | |
| 89 // Implementation of "properties" command. | |
| 90 static jint get_system_properties(AttachOperation* op, outputStream* out) { | |
| 91 return get_properties(op, out, vmSymbolHandles::serializePropertiesToByteArray_name()); | |
| 92 } | |
| 93 | |
| 94 // Implementation of "agent_properties" command. | |
| 95 static jint get_agent_properties(AttachOperation* op, outputStream* out) { | |
| 96 return get_properties(op, out, vmSymbolHandles::serializeAgentPropertiesToByteArray_name()); | |
| 97 } | |
| 98 | |
| 99 // Implementation of "datadump" command. | |
| 100 // | |
| 101 // Raises a SIGBREAK signal so that VM dump threads, does deadlock detection, | |
| 102 // etc. In theory this command should only post a DataDumpRequest to any | |
| 103 // JVMTI environment that has enabled this event. However it's useful to | |
| 104 // trigger the SIGBREAK handler. | |
| 105 | |
| 106 static jint data_dump(AttachOperation* op, outputStream* out) { | |
| 107 if (!ReduceSignalUsage) { | |
| 108 AttachListener::pd_data_dump(); | |
| 109 } else { | |
| 110 if (JvmtiExport::should_post_data_dump()) { | |
| 111 JvmtiExport::post_data_dump(); | |
| 112 } | |
| 113 } | |
| 114 return JNI_OK; | |
| 115 } | |
| 116 | |
| 117 // Implementation of "threaddump" command - essentially a remote ctrl-break | |
| 118 // | |
| 119 static jint thread_dump(AttachOperation* op, outputStream* out) { | |
| 120 bool print_concurrent_locks = false; | |
| 121 if (op->arg(0) != NULL && strcmp(op->arg(0), "-l") == 0) { | |
| 122 print_concurrent_locks = true; | |
| 123 } | |
| 124 | |
| 125 // thread stacks | |
| 126 VM_PrintThreads op1(out, print_concurrent_locks); | |
| 127 VMThread::execute(&op1); | |
| 128 | |
| 129 // JNI global handles | |
| 130 VM_PrintJNI op2(out); | |
| 131 VMThread::execute(&op2); | |
| 132 | |
| 133 // Deadlock detection | |
| 134 VM_FindDeadlocks op3(out); | |
| 135 VMThread::execute(&op3); | |
| 136 | |
| 137 return JNI_OK; | |
| 138 } | |
| 139 | |
| 140 #ifndef SERVICES_KERNEL // Heap dumping not supported | |
| 141 // Implementation of "dumpheap" command. | |
| 142 // | |
| 143 // Input arguments :- | |
| 144 // arg0: Name of the dump file | |
| 145 // arg1: "-live" or "-all" | |
| 146 jint dump_heap(AttachOperation* op, outputStream* out) { | |
| 147 const char* path = op->arg(0); | |
| 148 if (path == NULL || path[0] == '\0') { | |
| 149 out->print_cr("No dump file specified"); | |
| 150 } else { | |
| 151 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
| 152 const char* arg1 = op->arg(1); | |
| 153 if (arg1 != NULL && (strlen(arg1) > 0)) { | |
| 154 if (strcmp(arg1, "-all") != 0 && strcmp(arg1, "-live") != 0) { | |
| 155 out->print_cr("Invalid argument to dumpheap operation: %s", arg1); | |
| 156 return JNI_ERR; | |
| 157 } | |
| 158 live_objects_only = strcmp(arg1, "-live") == 0; | |
| 159 } | |
| 160 | |
| 161 // Request a full GC before heap dump if live_objects_only = true | |
| 162 // This helps reduces the amount of unreachable objects in the dump | |
| 163 // and makes it easier to browse. | |
| 164 HeapDumper dumper(live_objects_only /* request GC */); | |
| 165 int res = dumper.dump(op->arg(0)); | |
| 166 if (res == 0) { | |
| 167 out->print_cr("Heap dump file created"); | |
| 168 } else { | |
| 169 // heap dump failed | |
| 170 ResourceMark rm; | |
| 171 char* error = dumper.error_as_C_string(); | |
| 172 if (error == NULL) { | |
| 173 out->print_cr("Dump failed - reason unknown"); | |
| 174 } else { | |
| 175 out->print_cr("%s", error); | |
| 176 } | |
| 177 } | |
| 178 } | |
| 179 return JNI_OK; | |
| 180 } | |
| 181 #endif // SERVICES_KERNEL | |
| 182 | |
| 183 // Implementation of "inspectheap" command | |
| 184 // | |
| 185 // Input arguments :- | |
| 186 // arg0: "-live" or "-all" | |
| 187 static jint heap_inspection(AttachOperation* op, outputStream* out) { | |
| 188 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
| 189 const char* arg0 = op->arg(0); | |
| 190 if (arg0 != NULL && (strlen(arg0) > 0)) { | |
| 191 if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) { | |
| 192 out->print_cr("Invalid argument to inspectheap operation: %s", arg0); | |
| 193 return JNI_ERR; | |
| 194 } | |
| 195 live_objects_only = strcmp(arg0, "-live") == 0; | |
| 196 } | |
|
615
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
0
diff
changeset
|
197 VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */, true /* need_prologue */); |
| 0 | 198 VMThread::execute(&heapop); |
| 199 return JNI_OK; | |
| 200 } | |
| 201 | |
| 202 // set a boolean global flag using value from AttachOperation | |
| 203 static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* out) { | |
| 204 bool value = true; | |
| 205 const char* arg1; | |
| 206 if ((arg1 = op->arg(1)) != NULL) { | |
| 207 int tmp; | |
| 208 int n = sscanf(arg1, "%d", &tmp); | |
| 209 if (n != 1) { | |
| 210 out->print_cr("flag value has to be boolean (1 or 0)"); | |
| 211 return JNI_ERR; | |
| 212 } | |
| 213 value = (tmp != 0); | |
| 214 } | |
| 215 bool res = CommandLineFlags::boolAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
| 216 if (! res) { | |
| 217 out->print_cr("setting flag %s failed", name); | |
| 218 } | |
| 219 return res? JNI_OK : JNI_ERR; | |
| 220 } | |
| 221 | |
| 222 // set a intx global flag using value from AttachOperation | |
| 223 static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
| 224 intx value; | |
| 225 const char* arg1; | |
| 226 if ((arg1 = op->arg(1)) != NULL) { | |
| 227 int n = sscanf(arg1, INTX_FORMAT, &value); | |
| 228 if (n != 1) { | |
| 229 out->print_cr("flag value has to be integer"); | |
| 230 return JNI_ERR; | |
| 231 } | |
| 232 } | |
| 233 bool res = CommandLineFlags::intxAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
| 234 if (! res) { | |
| 235 out->print_cr("setting flag %s failed", name); | |
| 236 } | |
| 237 | |
| 238 return res? JNI_OK : JNI_ERR; | |
| 239 } | |
| 240 | |
| 241 // set a uintx global flag using value from AttachOperation | |
| 242 static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
| 243 uintx value; | |
| 244 const char* arg1; | |
| 245 if ((arg1 = op->arg(1)) != NULL) { | |
| 246 int n = sscanf(arg1, UINTX_FORMAT, &value); | |
| 247 if (n != 1) { | |
| 248 out->print_cr("flag value has to be integer"); | |
| 249 return JNI_ERR; | |
| 250 } | |
| 251 } | |
| 252 bool res = CommandLineFlags::uintxAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
| 253 if (! res) { | |
| 254 out->print_cr("setting flag %s failed", name); | |
| 255 } | |
| 256 | |
| 257 return res? JNI_OK : JNI_ERR; | |
| 258 } | |
| 259 | |
| 260 // set a string global flag using value from AttachOperation | |
| 261 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) { | |
| 262 const char* value; | |
| 263 if ((value = op->arg(1)) == NULL) { | |
| 264 out->print_cr("flag value has to be a string"); | |
| 265 return JNI_ERR; | |
| 266 } | |
| 267 bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
| 268 if (res) { | |
| 269 FREE_C_HEAP_ARRAY(char, value); | |
| 270 } else { | |
| 271 out->print_cr("setting flag %s failed", name); | |
| 272 } | |
| 273 | |
| 274 return res? JNI_OK : JNI_ERR; | |
| 275 } | |
| 276 | |
| 277 // Implementation of "setflag" command | |
| 278 static jint set_flag(AttachOperation* op, outputStream* out) { | |
| 279 | |
| 280 const char* name = NULL; | |
| 281 if ((name = op->arg(0)) == NULL) { | |
| 282 out->print_cr("flag name is missing"); | |
| 283 return JNI_ERR; | |
| 284 } | |
| 285 | |
| 286 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
| 287 if (f && f->is_external() && f->is_writeable()) { | |
| 288 if (f->is_bool()) { | |
| 289 return set_bool_flag(name, op, out); | |
| 290 } else if (f->is_intx()) { | |
| 291 return set_intx_flag(name, op, out); | |
| 292 } else if (f->is_uintx()) { | |
| 293 return set_uintx_flag(name, op, out); | |
| 294 } else if (f->is_ccstr()) { | |
| 295 return set_ccstr_flag(name, op, out); | |
| 296 } else { | |
| 297 ShouldNotReachHere(); | |
| 298 return JNI_ERR; | |
| 299 } | |
| 300 } else { | |
| 301 return AttachListener::pd_set_flag(op, out); | |
| 302 } | |
| 303 } | |
| 304 | |
| 305 // Implementation of "printflag" command | |
| 306 static jint print_flag(AttachOperation* op, outputStream* out) { | |
| 307 const char* name = NULL; | |
| 308 if ((name = op->arg(0)) == NULL) { | |
| 309 out->print_cr("flag name is missing"); | |
| 310 return JNI_ERR; | |
| 311 } | |
| 312 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
| 313 if (f) { | |
| 314 f->print_as_flag(out); | |
| 315 out->print_cr(""); | |
| 316 } else { | |
| 317 out->print_cr("no such flag '%s'", name); | |
| 318 } | |
| 319 return JNI_OK; | |
| 320 } | |
| 321 | |
| 322 // Table to map operation names to functions. | |
| 323 | |
| 324 // names must be of length <= AttachOperation::name_length_max | |
| 325 static AttachOperationFunctionInfo funcs[] = { | |
| 326 { "agentProperties", get_agent_properties }, | |
| 327 { "datadump", data_dump }, | |
| 328 #ifndef SERVICES_KERNEL | |
| 329 { "dumpheap", dump_heap }, | |
| 330 #endif // SERVICES_KERNEL | |
| 331 { "load", JvmtiExport::load_agent_library }, | |
| 332 { "properties", get_system_properties }, | |
| 333 { "threaddump", thread_dump }, | |
| 334 { "inspectheap", heap_inspection }, | |
| 335 { "setflag", set_flag }, | |
| 336 { "printflag", print_flag }, | |
| 337 { NULL, NULL } | |
| 338 }; | |
| 339 | |
| 340 | |
| 341 | |
| 342 // The Attach Listener threads services a queue. It dequeues an operation | |
| 343 // from the queue, examines the operation name (command), and dispatches | |
| 344 // to the corresponding function to perform the operation. | |
| 345 | |
| 346 static void attach_listener_thread_entry(JavaThread* thread, TRAPS) { | |
| 347 os::set_priority(thread, NearMaxPriority); | |
| 348 | |
| 349 if (AttachListener::pd_init() != 0) { | |
| 350 return; | |
| 351 } | |
| 352 AttachListener::set_initialized(); | |
| 353 | |
| 354 for (;;) { | |
| 355 AttachOperation* op = AttachListener::dequeue(); | |
| 356 if (op == NULL) { | |
| 357 return; // dequeue failed or shutdown | |
| 358 } | |
| 359 | |
| 360 ResourceMark rm; | |
| 361 bufferedStream st; | |
| 362 jint res = JNI_OK; | |
| 363 | |
| 364 // handle special detachall operation | |
| 365 if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) { | |
| 366 AttachListener::detachall(); | |
| 367 } else { | |
| 368 // find the function to dispatch too | |
| 369 AttachOperationFunctionInfo* info = NULL; | |
| 370 for (int i=0; funcs[i].name != NULL; i++) { | |
| 371 const char* name = funcs[i].name; | |
| 372 assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max"); | |
| 373 if (strcmp(op->name(), name) == 0) { | |
| 374 info = &(funcs[i]); | |
| 375 break; | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 // check for platform dependent attach operation | |
| 380 if (info == NULL) { | |
| 381 info = AttachListener::pd_find_operation(op->name()); | |
| 382 } | |
| 383 | |
| 384 if (info != NULL) { | |
| 385 // dispatch to the function that implements this operation | |
| 386 res = (info->func)(op, &st); | |
| 387 } else { | |
| 388 st.print("Operation %s not recognized!", op->name()); | |
| 389 res = JNI_ERR; | |
| 390 } | |
| 391 } | |
| 392 | |
| 393 // operation complete - send result and output to client | |
| 394 op->complete(res, &st); | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 // Starts the Attach Listener thread | |
| 399 void AttachListener::init() { | |
| 400 EXCEPTION_MARK; | |
| 401 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
| 402 instanceKlassHandle klass (THREAD, k); | |
| 403 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 404 | |
| 405 const char thread_name[] = "Attach Listener"; | |
| 406 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
| 407 | |
| 408 // Initialize thread_oop to put it into the system threadGroup | |
| 409 Handle thread_group (THREAD, Universe::system_thread_group()); | |
| 410 JavaValue result(T_VOID); | |
| 411 JavaCalls::call_special(&result, thread_oop, | |
| 412 klass, | |
| 413 vmSymbolHandles::object_initializer_name(), | |
| 414 vmSymbolHandles::threadgroup_string_void_signature(), | |
| 415 thread_group, | |
| 416 string, | |
| 417 CHECK); | |
| 418 | |
| 419 KlassHandle group(THREAD, SystemDictionary::threadGroup_klass()); | |
| 420 JavaCalls::call_special(&result, | |
| 421 thread_group, | |
| 422 group, | |
| 423 vmSymbolHandles::add_method_name(), | |
| 424 vmSymbolHandles::thread_void_signature(), | |
| 425 thread_oop, // ARG 1 | |
| 426 CHECK); | |
| 427 | |
| 428 { MutexLocker mu(Threads_lock); | |
| 429 JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry); | |
| 430 | |
| 431 // Check that thread and osthread were created | |
| 432 if (listener_thread == NULL || listener_thread->osthread() == NULL) { | |
| 433 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
| 434 "unable to create new native thread"); | |
| 435 } | |
| 436 | |
| 437 java_lang_Thread::set_thread(thread_oop(), listener_thread); | |
| 438 java_lang_Thread::set_daemon(thread_oop()); | |
| 439 | |
| 440 listener_thread->set_threadObj(thread_oop()); | |
| 441 Threads::add(listener_thread); | |
| 442 Thread::start(listener_thread); | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 // Performs clean-up tasks on platforms where we can detect that the last | |
| 447 // client has detached | |
| 448 void AttachListener::detachall() { | |
| 449 // call the platform dependent clean-up | |
| 450 pd_detachall(); | |
| 451 } |