1 /* 2 * Copyright (c) 2001, 2017, 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 #include "precompiled.hpp" 26 #include "classfile/vmSymbols.hpp" 27 #include "logging/log.hpp" 28 #include "oops/oop.inline.hpp" 29 #include "prims/jvm.h" 30 #include "runtime/handles.inline.hpp" 31 #include "runtime/java.hpp" 32 #include "runtime/mutex.hpp" 33 #include "runtime/mutexLocker.hpp" 34 #include "runtime/os.hpp" 35 #include "runtime/perfData.hpp" 36 #include "utilities/exceptions.hpp" 37 #include "utilities/globalDefinitions.hpp" 38 39 PerfDataList* PerfDataManager::_all = NULL; 40 PerfDataList* PerfDataManager::_sampled = NULL; 41 PerfDataList* PerfDataManager::_constants = NULL; 42 volatile bool PerfDataManager::_has_PerfData = 0; 43 44 /* 45 * The jvmstat global and subsystem jvmstat counter name spaces. The top 46 * level name spaces imply the interface stability level of the counter, 47 * which generally follows the Java package, class, and property naming 48 * conventions. The CounterNS enumeration values should be used to index 49 * into this array. 50 */ 51 const char* PerfDataManager::_name_spaces[] = { 52 // top level name spaces 53 "java", // stable and supported name space 54 "com.sun", // unstable but supported name space 55 "sun", // unstable and unsupported name space 56 // subsystem name spaces 57 "java.gc", // Garbage Collection name spaces 58 "com.sun.gc", 59 "sun.gc", 60 "java.ci", // Compiler name spaces 61 "com.sun.ci", 62 "sun.ci", 63 "java.cls", // Class Loader name spaces 64 "com.sun.cls", 65 "sun.cls", 66 "java.rt", // Runtime name spaces 67 "com.sun.rt", 68 "sun.rt", 69 "java.os", // Operating System name spaces 70 "com.sun.os", 71 "sun.os", 72 "java.threads", // Threads System name spaces 73 "com.sun.threads", 74 "sun.threads", 75 "java.property", // Java Property name spaces 76 "com.sun.property", 77 "sun.property", 78 "", 79 }; 80 81 PerfData::PerfData(CounterNS ns, const char* name, Units u, Variability v) 82 : _name(NULL), _u(u), _v(v), _valuep(NULL), 83 _on_c_heap(false) { 84 85 const char* prefix = PerfDataManager::ns_to_string(ns); 86 87 _name = NEW_C_HEAP_ARRAY(char, strlen(name) + strlen(prefix) + 2, mtInternal); 88 assert(_name != NULL && strlen(name) != 0, "invalid name"); 89 90 if (ns == NULL_NS) { 91 // No prefix is added to counters with the NULL_NS namespace. 92 strcpy(_name, name); 93 // set the F_Supported flag based on the counter name prefix. 94 if (PerfDataManager::is_stable_supported(_name) || 95 PerfDataManager::is_unstable_supported(_name)) { 96 _flags = F_Supported; 97 } 98 else { 99 _flags = F_None; 100 } 101 } 102 else { 103 sprintf(_name, "%s.%s", prefix, name); 104 // set the F_Supported flag based on the given namespace. 105 if (PerfDataManager::is_stable_supported(ns) || 106 PerfDataManager::is_unstable_supported(ns)) { 107 _flags = F_Supported; 108 } 109 else { 110 _flags = F_None; 111 } 112 } 113 } 114 115 PerfData::~PerfData() { 116 if (_name != NULL) { 117 FREE_C_HEAP_ARRAY(char, _name); 118 } 119 if (is_on_c_heap()) { 120 FREE_C_HEAP_ARRAY(PerfDataEntry, _pdep); 121 } 122 } 123 124 void PerfData::create_entry(BasicType dtype, size_t dsize, size_t vlen) { 125 126 size_t dlen = vlen==0 ? 1 : vlen; 127 128 size_t namelen = strlen(name()) + 1; // include null terminator 129 size_t size = sizeof(PerfDataEntry) + namelen; 130 size_t pad_length = ((size % dsize) == 0) ? 0 : dsize - (size % dsize); 131 size += pad_length; 132 size_t data_start = size; 133 size += (dsize * dlen); 134 135 // align size to assure allocation in units of 8 bytes 136 int align = sizeof(jlong) - 1; 137 size = ((size + align) & ~align); 138 char* psmp = PerfMemory::alloc(size); 139 140 if (psmp == NULL) { 141 // out of PerfMemory memory resources. allocate on the C heap 142 // to avoid vm termination. 143 psmp = NEW_C_HEAP_ARRAY(char, size, mtInternal); 144 _on_c_heap = true; 145 } 146 147 // compute the addresses for the name and data 148 char* cname = psmp + sizeof(PerfDataEntry); 149 150 // data is in the last dsize*dlen bytes of the entry 151 void* valuep = (void*) (psmp + data_start); 152 153 assert(is_on_c_heap() || PerfMemory::contains(cname), "just checking"); 154 assert(is_on_c_heap() || PerfMemory::contains((char*)valuep), "just checking"); 155 156 // copy the name, including null terminator, into PerfData memory 157 strcpy(cname, name()); 158 159 160 // set the header values in PerfData memory 161 PerfDataEntry* pdep = (PerfDataEntry*)psmp; 162 pdep->entry_length = (jint)size; 163 pdep->name_offset = (jint) ((uintptr_t) cname - (uintptr_t) psmp); 164 pdep->vector_length = (jint)vlen; 165 pdep->data_type = (jbyte) type2char(dtype); 166 pdep->data_units = units(); 167 pdep->data_variability = variability(); 168 pdep->flags = (jbyte)flags(); 169 pdep->data_offset = (jint) data_start; 170 171 log_debug(perf, datacreation)("name = %s, dtype = %d, variability = %d," 172 " units = %d, dsize = " SIZE_FORMAT ", vlen = " SIZE_FORMAT "," 173 " pad_length = " SIZE_FORMAT ", size = " SIZE_FORMAT ", on_c_heap = %s," 174 " address = " INTPTR_FORMAT "," 175 " data address = " INTPTR_FORMAT "\n", 176 cname, dtype, variability(), 177 units(), dsize, vlen, 178 pad_length, size, is_on_c_heap() ? "TRUE":"FALSE", 179 p2i(psmp), p2i(valuep)); 180 181 // record the start of the entry and the location of the data field. 182 _pdep = pdep; 183 _valuep = valuep; 184 185 // mark the PerfData memory region as having been updated. 186 PerfMemory::mark_updated(); 187 } 188 189 PerfLong::PerfLong(CounterNS ns, const char* namep, Units u, Variability v) 190 : PerfData(ns, namep, u, v) { 191 192 create_entry(T_LONG, sizeof(jlong)); 193 } 194 195 int PerfLong::format(char* buffer, int length) { 196 return jio_snprintf(buffer, length, JLONG_FORMAT, *(jlong*)_valuep); 197 } 198 199 PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u, 200 Variability v, jlong* sampled) 201 : PerfLong(ns, namep, u, v), 202 _sampled(sampled), _sample_helper(NULL) { 203 204 sample(); 205 } 206 207 PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u, 208 Variability v, PerfLongSampleHelper* helper) 209 : PerfLong(ns, namep, u, v), 210 _sampled(NULL), _sample_helper(helper) { 211 212 sample(); 213 } 214 215 void PerfLongVariant::sample() { 216 if (_sample_helper != NULL) { 217 *(jlong*)_valuep = _sample_helper->take_sample(); 218 } 219 } 220 221 PerfByteArray::PerfByteArray(CounterNS ns, const char* namep, Units u, 222 Variability v, jint length) 223 : PerfData(ns, namep, u, v), _length(length) { 224 225 create_entry(T_BYTE, sizeof(jbyte), (size_t)_length); 226 } 227 228 void PerfString::set_string(const char* s2) { 229 230 // copy n bytes of the string, assuring the null string is 231 // copied if s2 == NULL. 232 strncpy((char *)_valuep, s2 == NULL ? "" : s2, _length); 233 234 // assure the string is null terminated when strlen(s2) >= _length 235 ((char*)_valuep)[_length-1] = '\0'; 236 } 237 238 int PerfString::format(char* buffer, int length) { 239 return jio_snprintf(buffer, length, "%s", (char*)_valuep); 240 } 241 242 PerfStringConstant::PerfStringConstant(CounterNS ns, const char* namep, 243 const char* initial_value) 244 : PerfString(ns, namep, V_Constant, 245 initial_value == NULL ? 1 : 246 MIN2((jint)(strlen((char*)initial_value)+1), 247 (jint)(PerfMaxStringConstLength+1)), 248 initial_value) { 249 250 if (PrintMiscellaneous && Verbose) { 251 if (is_valid() && initial_value != NULL && 252 ((jint)strlen(initial_value) > (jint)PerfMaxStringConstLength)) { 253 254 warning("Truncating PerfStringConstant: name = %s," 255 " length = " INT32_FORMAT "," 256 " PerfMaxStringConstLength = " INT32_FORMAT "\n", 257 namep, 258 (jint)strlen(initial_value), 259 (jint)PerfMaxStringConstLength); 260 } 261 } 262 } 263 264 265 void PerfDataManager::destroy() { 266 267 if (_all == NULL) 268 // destroy already called, or initialization never happened 269 return; 270 271 // Clear the flag before we free the PerfData counters. Thus begins 272 // the race between this thread and another thread that has just 273 // queried PerfDataManager::has_PerfData() and gotten back 'true'. 274 // The hope is that the other thread will finish its PerfData 275 // manipulation before we free the memory. The two alternatives are 276 // 1) leak the PerfData memory or 2) do some form of synchronized 277 // access or check before every PerfData operation. 278 _has_PerfData = false; 279 os::naked_short_sleep(1); // 1ms sleep to let other thread(s) run 280 281 for (int index = 0; index < _all->length(); index++) { 282 PerfData* p = _all->at(index); 283 delete p; 284 } 285 286 delete(_all); 287 delete(_sampled); 288 delete(_constants); 289 290 _all = NULL; 291 _sampled = NULL; 292 _constants = NULL; 293 } 294 295 void PerfDataManager::add_item(PerfData* p, bool sampled) { 296 297 MutexLocker ml(PerfDataManager_lock); 298 299 if (_all == NULL) { 300 _all = new PerfDataList(100); 301 _has_PerfData = true; 302 } 303 304 assert(!_all->contains(p->name()), "duplicate name added"); 305 306 // add to the list of all perf data items 307 _all->append(p); 308 309 if (p->variability() == PerfData::V_Constant) { 310 if (_constants == NULL) { 311 _constants = new PerfDataList(25); 312 } 313 _constants->append(p); 314 return; 315 } 316 317 if (sampled) { 318 if (_sampled == NULL) { 319 _sampled = new PerfDataList(25); 320 } 321 _sampled->append(p); 322 } 323 } 324 325 PerfData* PerfDataManager::find_by_name(const char* name) { 326 return _all->find_by_name(name); 327 } 328 329 PerfDataList* PerfDataManager::all() { 330 331 MutexLocker ml(PerfDataManager_lock); 332 333 if (_all == NULL) 334 return NULL; 335 336 PerfDataList* clone = _all->clone(); 337 return clone; 338 } 339 340 PerfDataList* PerfDataManager::sampled() { 341 342 MutexLocker ml(PerfDataManager_lock); 343 344 if (_sampled == NULL) 345 return NULL; 346 347 PerfDataList* clone = _sampled->clone(); 348 return clone; 349 } 350 351 PerfDataList* PerfDataManager::constants() { 352 353 MutexLocker ml(PerfDataManager_lock); 354 355 if (_constants == NULL) 356 return NULL; 357 358 PerfDataList* clone = _constants->clone(); 359 return clone; 360 } 361 362 char* PerfDataManager::counter_name(const char* ns, const char* name) { 363 assert(ns != NULL, "ns string required"); 364 assert(name != NULL, "name string required"); 365 366 size_t len = strlen(ns) + strlen(name) + 2; 367 char* result = NEW_RESOURCE_ARRAY(char, len); 368 sprintf(result, "%s.%s", ns, name); 369 return result; 370 } 371 372 char* PerfDataManager::name_space(const char* ns, const char* sub, 373 int instance) { 374 char intbuf[40]; 375 jio_snprintf(intbuf, 40, UINT32_FORMAT, instance); 376 return name_space(ns, name_space(sub, intbuf)); 377 } 378 379 char *PerfDataManager::name_space(const char* ns, int instance) { 380 char intbuf[40]; 381 jio_snprintf(intbuf, 40, UINT32_FORMAT, instance); 382 return name_space(ns, intbuf); 383 } 384 385 PerfStringConstant* PerfDataManager::create_string_constant(CounterNS ns, 386 const char* name, 387 const char* s, 388 TRAPS) { 389 390 PerfStringConstant* p = new PerfStringConstant(ns, name, s); 391 392 if (!p->is_valid()) { 393 // allocation of native resources failed. 394 delete p; 395 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 396 } 397 398 add_item(p, false); 399 400 return p; 401 } 402 403 PerfLongConstant* PerfDataManager::create_long_constant(CounterNS ns, 404 const char* name, 405 PerfData::Units u, 406 jlong val, TRAPS) { 407 408 PerfLongConstant* p = new PerfLongConstant(ns, name, u, val); 409 410 if (!p->is_valid()) { 411 // allocation of native resources failed. 412 delete p; 413 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 414 } 415 416 add_item(p, false); 417 418 return p; 419 } 420 421 PerfStringVariable* PerfDataManager::create_string_variable(CounterNS ns, 422 const char* name, 423 jint max_length, 424 const char* s, 425 TRAPS) { 426 427 if (max_length == 0 && s != NULL) max_length = (jint)strlen(s); 428 429 assert(max_length != 0, "PerfStringVariable with length 0"); 430 431 PerfStringVariable* p = new PerfStringVariable(ns, name, max_length, s); 432 433 if (!p->is_valid()) { 434 // allocation of native resources failed. 435 delete p; 436 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 437 } 438 439 add_item(p, false); 440 441 return p; 442 } 443 444 PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns, 445 const char* name, 446 PerfData::Units u, 447 jlong ival, TRAPS) { 448 449 PerfLongVariable* p = new PerfLongVariable(ns, name, u, ival); 450 451 if (!p->is_valid()) { 452 // allocation of native resources failed. 453 delete p; 454 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 455 } 456 457 add_item(p, false); 458 459 return p; 460 } 461 462 PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns, 463 const char* name, 464 PerfData::Units u, 465 jlong* sp, TRAPS) { 466 467 // Sampled counters not supported if UsePerfData is false 468 if (!UsePerfData) return NULL; 469 470 PerfLongVariable* p = new PerfLongVariable(ns, name, u, sp); 471 472 if (!p->is_valid()) { 473 // allocation of native resources failed. 474 delete p; 475 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 476 } 477 478 add_item(p, true); 479 480 return p; 481 } 482 483 PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns, 484 const char* name, 485 PerfData::Units u, 486 PerfSampleHelper* sh, 487 TRAPS) { 488 489 // Sampled counters not supported if UsePerfData is false 490 if (!UsePerfData) return NULL; 491 492 PerfLongVariable* p = new PerfLongVariable(ns, name, u, sh); 493 494 if (!p->is_valid()) { 495 // allocation of native resources failed. 496 delete p; 497 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 498 } 499 500 add_item(p, true); 501 502 return p; 503 } 504 505 PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns, 506 const char* name, 507 PerfData::Units u, 508 jlong ival, TRAPS) { 509 510 PerfLongCounter* p = new PerfLongCounter(ns, name, u, ival); 511 512 if (!p->is_valid()) { 513 // allocation of native resources failed. 514 delete p; 515 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 516 } 517 518 add_item(p, false); 519 520 return p; 521 } 522 523 PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns, 524 const char* name, 525 PerfData::Units u, 526 jlong* sp, TRAPS) { 527 528 // Sampled counters not supported if UsePerfData is false 529 if (!UsePerfData) return NULL; 530 531 PerfLongCounter* p = new PerfLongCounter(ns, name, u, sp); 532 533 if (!p->is_valid()) { 534 // allocation of native resources failed. 535 delete p; 536 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 537 } 538 539 add_item(p, true); 540 541 return p; 542 } 543 544 PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns, 545 const char* name, 546 PerfData::Units u, 547 PerfSampleHelper* sh, 548 TRAPS) { 549 550 // Sampled counters not supported if UsePerfData is false 551 if (!UsePerfData) return NULL; 552 553 PerfLongCounter* p = new PerfLongCounter(ns, name, u, sh); 554 555 if (!p->is_valid()) { 556 // allocation of native resources failed. 557 delete p; 558 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 559 } 560 561 add_item(p, true); 562 563 return p; 564 } 565 566 PerfDataList::PerfDataList(int length) { 567 568 _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(length, true); 569 } 570 571 PerfDataList::PerfDataList(PerfDataList* p) { 572 573 _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(p->length(), true); 574 575 _set->appendAll(p->get_impl()); 576 } 577 578 PerfDataList::~PerfDataList() { 579 580 delete _set; 581 582 } 583 584 bool PerfDataList::by_name(void* name, PerfData* pd) { 585 586 if (pd == NULL) 587 return false; 588 589 return strcmp((const char*)name, pd->name()) == 0; 590 } 591 592 PerfData* PerfDataList::find_by_name(const char* name) { 593 594 // if add_item hasn't been called the list won't be initialized 595 if (this == NULL) 596 return NULL; 597 598 int i = _set->find((void*)name, PerfDataList::by_name); 599 600 if (i >= 0 && i <= _set->length()) 601 return _set->at(i); 602 else 603 return NULL; 604 } 605 606 PerfDataList* PerfDataList::clone() { 607 608 PerfDataList* copy = new PerfDataList(this); 609 610 assert(copy != NULL, "just checking"); 611 612 return copy; 613 }