1 /* 2 * Copyright (c) 2011, 2018, 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 "jfr/jfr.hpp" 27 #include "jfr/jni/jfrJavaSupport.hpp" 28 #include "jfr/recorder/jfrRecorder.hpp" 29 #include "jfr/recorder/repository/jfrChunkState.hpp" 30 #include "jfr/recorder/repository/jfrChunkWriter.hpp" 31 #include "jfr/recorder/repository/jfrRepository.hpp" 32 #include "jfr/recorder/service/jfrPostBox.hpp" 33 #include "logging/log.hpp" 34 #include "memory/resourceArea.hpp" 35 #include "runtime/mutex.hpp" 36 #include "runtime/os.hpp" 37 #include "runtime/thread.inline.hpp" 38 39 static JfrRepository* _instance = NULL; 40 41 JfrRepository& JfrRepository::instance() { 42 return *_instance; 43 } 44 45 static JfrChunkWriter* _chunkwriter = NULL; 46 47 static bool initialize_chunkwriter() { 48 assert(_chunkwriter == NULL, "invariant"); 49 _chunkwriter = new JfrChunkWriter(); 50 return _chunkwriter != NULL && _chunkwriter->initialize(); 51 } 52 53 JfrChunkWriter& JfrRepository::chunkwriter() { 54 return *_chunkwriter; 55 } 56 57 JfrRepository::JfrRepository(JfrPostBox& post_box) : _path(NULL), _post_box(post_box) {} 58 59 bool JfrRepository::initialize() { 60 return initialize_chunkwriter(); 61 } 62 63 JfrRepository::~JfrRepository() { 64 if (_path != NULL) { 65 JfrCHeapObj::free(_path, strlen(_path) + 1); 66 _path = NULL; 67 } 68 69 if (_chunkwriter != NULL) { 70 delete _chunkwriter; 71 _chunkwriter = NULL; 72 } 73 } 74 75 JfrRepository* JfrRepository::create(JfrPostBox& post_box) { 76 assert(_instance == NULL, "invariant"); 77 _instance = new JfrRepository(post_box); 78 return _instance; 79 } 80 81 void JfrRepository::destroy() { 82 assert(_instance != NULL, "invariant"); 83 delete _instance; 84 _instance = NULL; 85 } 86 87 static const char vm_error_filename_fmt[] = "hs_err_pid%p.jfr"; 88 static const char vm_oom_filename_fmt[] = "hs_oom_pid%p.jfr"; 89 static const char vm_soe_filename_fmt[] = "hs_soe_pid%p.jfr"; 90 static const char chunk_file_jfr_ext[] = ".jfr"; 91 static const size_t iso8601_len = 19; // "YYYY-MM-DDTHH:MM:SS" 92 93 static fio_fd open_exclusivly(const char* path) { 94 return os::open(path, O_CREAT | O_WRONLY, S_IREAD | S_IWRITE); 95 } 96 97 static fio_fd open_existing(const char* path) { 98 return os::open(path, O_RDWR, S_IREAD | S_IWRITE); 99 } 100 101 static int file_sort(const char** const file1, const char** file2) { 102 assert(NULL != *file1 && NULL != *file2, "invariant"); 103 int cmp = strncmp(*file1, *file2, iso8601_len); 104 if (0 == cmp) { 105 const char* const dot1 = strchr(*file1, '.'); 106 assert(NULL != dot1, "invariant"); 107 const char* const dot2 = strchr(*file2, '.'); 108 assert(NULL != dot2, "invariant"); 109 ptrdiff_t file1_len = dot1 - *file1; 110 ptrdiff_t file2_len = dot2 - *file2; 111 if (file1_len < file2_len) { 112 return -1; 113 } 114 if (file1_len > file2_len) { 115 return 1; 116 } 117 assert(file1_len == file2_len, "invariant"); 118 cmp = strncmp(*file1, *file2, file1_len); 119 } 120 assert(cmp != 0, "invariant"); 121 return cmp; 122 } 123 124 static void iso8601_to_date_time(char* iso8601_str) { 125 assert(iso8601_str != NULL, "invariant"); 126 assert(strlen(iso8601_str) == iso8601_len, "invariant"); 127 // "YYYY-MM-DDTHH:MM:SS" 128 for (size_t i = 0; i < iso8601_len; ++i) { 129 switch(iso8601_str[i]) { 130 case 'T' : 131 case '-' : 132 case ':' : 133 iso8601_str[i] = '_'; 134 break; 135 } 136 } 137 // "YYYY_MM_DD_HH_MM_SS" 138 } 139 140 static void date_time(char* buffer, size_t buffer_len) { 141 assert(buffer != NULL, "invariant"); 142 assert(buffer_len >= iso8601_len, "buffer too small"); 143 os::iso8601_time(buffer, buffer_len); 144 assert(strlen(buffer) >= iso8601_len + 1, "invariant"); 145 // "YYYY-MM-DDTHH:MM:SS" 146 buffer[iso8601_len] = '\0'; 147 iso8601_to_date_time(buffer); 148 } 149 150 static jlong file_size(fio_fd fd) { 151 assert(fd != invalid_fd, "invariant"); 152 const jlong current_offset = os::current_file_offset(fd); 153 const jlong size = os::lseek(fd, 0, SEEK_END); 154 os::seek_to_file_offset(fd, current_offset); 155 return size; 156 } 157 158 class RepositoryIterator : public StackObj { 159 private: 160 const char* const _repo; 161 const size_t _repository_len; 162 GrowableArray<const char*>* _files; 163 const char* const fully_qualified(const char* entry) const; 164 mutable int _iterator; 165 166 public: 167 RepositoryIterator(const char* repository, size_t repository_len); 168 ~RepositoryIterator() {} 169 debug_only(void print_repository_files() const;) 170 const char* const filter(const char* entry) const; 171 bool has_next() const; 172 const char* const next() const; 173 }; 174 175 const char* const RepositoryIterator::fully_qualified(const char* entry) const { 176 assert(NULL != entry, "invariant"); 177 char* file_path_entry = NULL; 178 // only use files that have content, not placeholders 179 const char* const file_separator = os::file_separator(); 180 if (NULL != file_separator) { 181 const size_t entry_len = strlen(entry); 182 const size_t file_separator_length = strlen(file_separator); 183 const size_t file_path_entry_length = _repository_len + file_separator_length + entry_len; 184 file_path_entry = NEW_RESOURCE_ARRAY_RETURN_NULL(char, file_path_entry_length + 1); 185 if (NULL == file_path_entry) { 186 return NULL; 187 } 188 int position = 0; 189 position += jio_snprintf(&file_path_entry[position], _repository_len + 1, "%s", _repo); 190 position += jio_snprintf(&file_path_entry[position], file_separator_length + 1, "%s", os::file_separator()); 191 position += jio_snprintf(&file_path_entry[position], entry_len + 1, "%s", entry); 192 file_path_entry[position] = '\0'; 193 assert((size_t)position == file_path_entry_length, "invariant"); 194 assert(strlen(file_path_entry) == (size_t)position, "invariant"); 195 } 196 return file_path_entry; 197 } 198 199 const char* const RepositoryIterator::filter(const char* entry) const { 200 if (entry == NULL) { 201 return NULL; 202 } 203 const size_t entry_len = strlen(entry); 204 if (entry_len <= 2) { 205 // for "." and ".." 206 return NULL; 207 } 208 char* entry_name = NEW_RESOURCE_ARRAY_RETURN_NULL(char, entry_len + 1); 209 if (entry_name == NULL) { 210 return NULL; 211 } 212 strncpy(entry_name, entry, entry_len); 213 entry_name[entry_len] = '\0'; 214 const char* const fully_qualified_path_entry = fully_qualified(entry_name); 215 if (NULL == fully_qualified_path_entry) { 216 return NULL; 217 } 218 const fio_fd entry_fd = open_existing(fully_qualified_path_entry); 219 if (invalid_fd == entry_fd) { 220 return NULL; 221 } 222 const jlong entry_size = file_size(entry_fd); 223 os::close(entry_fd); 224 if (0 == entry_size) { 225 return NULL; 226 } 227 return entry_name; 228 } 229 230 RepositoryIterator::RepositoryIterator(const char* repository, size_t repository_len) : 231 _repo(repository), 232 _repository_len(repository_len), 233 _files(NULL), 234 _iterator(0) { 235 if (NULL != _repo) { 236 assert(strlen(_repo) == _repository_len, "invariant"); 237 _files = new GrowableArray<const char*>(10); 238 DIR* dirp = os::opendir(_repo); 239 if (dirp == NULL) { 240 log_error(jfr, system)("Unable to open repository %s", _repo); 241 return; 242 } 243 struct dirent* dentry; 244 while ((dentry = os::readdir(dirp)) != NULL) { 245 const char* const entry_path = filter(dentry->d_name); 246 if (NULL != entry_path) { 247 _files->append(entry_path); 248 } 249 } 250 os::closedir(dirp); 251 if (_files->length() > 1) { 252 _files->sort(file_sort); 253 } 254 } 255 } 256 257 #ifdef ASSERT 258 void RepositoryIterator::print_repository_files() const { 259 while (has_next()) { 260 log_error(jfr, system)( "%s", next()); 261 } 262 } 263 #endif 264 bool RepositoryIterator::has_next() const { 265 return (_files != NULL && _iterator < _files->length()); 266 } 267 268 const char* const RepositoryIterator::next() const { 269 return _iterator >= _files->length() ? NULL : fully_qualified(_files->at(_iterator++)); 270 } 271 272 static void write_emergency_file(fio_fd emergency_fd, const RepositoryIterator& iterator) { 273 assert(emergency_fd != invalid_fd, "invariant"); 274 const size_t size_of_file_copy_block = 1 * M; // 1 mb 275 jbyte* const file_copy_block = NEW_RESOURCE_ARRAY_RETURN_NULL(jbyte, size_of_file_copy_block); 276 if (file_copy_block == NULL) { 277 return; 278 } 279 jlong bytes_written_total = 0; 280 while (iterator.has_next()) { 281 fio_fd current_fd = invalid_fd; 282 const char* const fqn = iterator.next(); 283 if (fqn != NULL) { 284 current_fd = open_existing(fqn); 285 if (current_fd != invalid_fd) { 286 const jlong current_filesize = file_size(current_fd); 287 assert(current_filesize > 0, "invariant"); 288 jlong bytes_read = 0; 289 jlong bytes_written = 0; 290 while (bytes_read < current_filesize) { 291 bytes_read += (jlong)os::read_at(current_fd, file_copy_block, size_of_file_copy_block, bytes_read); 292 assert(bytes_read - bytes_written <= (jlong)size_of_file_copy_block, "invariant"); 293 bytes_written += (jlong)os::write(emergency_fd, file_copy_block, bytes_read - bytes_written); 294 assert(bytes_read == bytes_written, "invariant"); 295 } 296 os::close(current_fd); 297 bytes_written_total += bytes_written; 298 } 299 } 300 } 301 } 302 303 static const char* create_emergency_dump_path() { 304 assert(JfrStream_lock->owned_by_self(), "invariant"); 305 char* buffer = NEW_RESOURCE_ARRAY_RETURN_NULL(char, O_BUFLEN); 306 if (NULL == buffer) { 307 return NULL; 308 } 309 const char* const cwd = os::get_current_directory(buffer, O_BUFLEN); 310 if (NULL == cwd) { 311 return NULL; 312 } 313 size_t pos = strlen(cwd); 314 const int fsep_len = jio_snprintf(&buffer[pos], O_BUFLEN - pos, "%s", os::file_separator()); 315 const char* filename_fmt = NULL; 316 // fetch specific error cause 317 switch (JfrJavaSupport::cause()) { 318 case JfrJavaSupport::OUT_OF_MEMORY: 319 filename_fmt = vm_oom_filename_fmt; 320 break; 321 case JfrJavaSupport::STACK_OVERFLOW: 322 filename_fmt = vm_soe_filename_fmt; 323 break; 324 default: 325 filename_fmt = vm_error_filename_fmt; 326 } 327 char* emergency_dump_path = NULL; 328 pos += fsep_len; 329 if (Arguments::copy_expand_pid(filename_fmt, strlen(filename_fmt), &buffer[pos], O_BUFLEN - pos)) { 330 const size_t emergency_filename_length = strlen(buffer); 331 emergency_dump_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, emergency_filename_length + 1); 332 if (NULL == emergency_dump_path) { 333 return NULL; 334 } 335 strncpy(emergency_dump_path, buffer, emergency_filename_length); 336 emergency_dump_path[emergency_filename_length] = '\0'; 337 } 338 return emergency_dump_path; 339 } 340 341 // Caller needs ResourceMark 342 static const char* create_emergency_chunk_path(const char* repository_base, size_t repository_len) { 343 assert(repository_base != NULL, "invariant"); 344 assert(JfrStream_lock->owned_by_self(), "invariant"); 345 // date time 346 char date_time_buffer[32] = {0}; 347 date_time(date_time_buffer, sizeof(date_time_buffer)); 348 size_t date_time_len = strlen(date_time_buffer); 349 size_t chunkname_max_len = repository_len // repository_base 350 + 1 // "/" 351 + date_time_len // date_time 352 + strlen(chunk_file_jfr_ext) // .jfr 353 + 1; 354 char* chunk_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, chunkname_max_len); 355 if (chunk_path == NULL) { 356 return NULL; 357 } 358 // append the individual substrings 359 jio_snprintf(chunk_path, chunkname_max_len, "%s%s%s%s", repository_base, os::file_separator(), date_time_buffer, chunk_file_jfr_ext); 360 return chunk_path; 361 } 362 363 static fio_fd emergency_dump_file() { 364 assert(JfrStream_lock->owned_by_self(), "invariant"); 365 ResourceMark rm; 366 const char* const emergency_dump_path = create_emergency_dump_path(); 367 if (emergency_dump_path == NULL) { 368 return invalid_fd; 369 } 370 const fio_fd fd = open_exclusivly(emergency_dump_path); 371 if (fd != invalid_fd) { 372 log_info(jfr)( // For user, should not be "jfr, system" 373 "Attempting to recover JFR data, emergency jfr file: %s", emergency_dump_path); 374 } 375 return fd; 376 } 377 378 static const char* emergency_path(const char* repository, size_t repository_len) { 379 return repository == NULL ? create_emergency_dump_path() : create_emergency_chunk_path(repository, repository_len); 380 } 381 382 void JfrRepository::on_vm_error() { 383 assert(!JfrStream_lock->owned_by_self(), "invariant"); 384 const char* path = _path; 385 if (path == NULL) { 386 // completed already 387 return; 388 } 389 ResourceMark rm; 390 MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag); 391 const fio_fd emergency_fd = emergency_dump_file(); 392 if (emergency_fd != invalid_fd) { 393 RepositoryIterator iterator(path, strlen(path)); 394 write_emergency_file(emergency_fd, iterator); 395 os::close(emergency_fd); 396 } 397 } 398 399 bool JfrRepository::set_path(const char* path) { 400 assert(path != NULL, "trying to set the repository path with a NULL string!"); 401 if (_path != NULL) { 402 // delete existing 403 JfrCHeapObj::free(_path, strlen(_path) + 1); 404 } 405 const size_t path_len = strlen(path); 406 _path = JfrCHeapObj::new_array<char>(path_len + 1); 407 if (_path == NULL) { 408 return false; 409 } 410 strncpy(_path, path, path_len); 411 _path[path_len] = '\0'; 412 return true; 413 } 414 415 void JfrRepository::set_chunk_path(const char* path) { 416 assert(JfrStream_lock->owned_by_self(), "invariant"); 417 chunkwriter().set_chunk_path(path); 418 } 419 420 void JfrRepository::notify_on_new_chunk_path() { 421 if (Jfr::is_recording()) { 422 instance()._post_box.post(MSG_ROTATE); 423 } 424 } 425 426 /** 427 * Sets the file where data should be written. 428 * 429 * Recording Previous Current Action 430 * ============================================== 431 * true null null Ignore, keep recording in-memory 432 * true null file1 Start disk recording 433 * true file null Copy out metadata to disk and continue in-memory recording 434 * true file1 file2 Copy out metadata and start with new File (file2) 435 * false * null Ignore, but start recording to memory 436 * false * file Ignore, but start recording to disk 437 */ 438 void JfrRepository::set_chunk_path(jstring path, JavaThread* jt) { 439 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt)); 440 ResourceMark rm(jt); 441 const char* const canonical_chunk_path = JfrJavaSupport::c_str(path, jt); 442 { 443 MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag); 444 if (NULL == canonical_chunk_path && !_chunkwriter->is_valid()) { 445 // new output is NULL and current output is NULL 446 return; 447 } 448 instance().set_chunk_path(canonical_chunk_path); 449 } 450 notify_on_new_chunk_path(); 451 } 452 453 void JfrRepository::set_path(jstring location, JavaThread* jt) { 454 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt)); 455 ResourceMark rm(jt); 456 const char* const path = JfrJavaSupport::c_str(location, jt); 457 if (path != NULL) { 458 instance().set_path(path); 459 } 460 } 461 462 bool JfrRepository::open_chunk(bool vm_error /* false */) { 463 assert(JfrStream_lock->owned_by_self(), "invariant"); 464 if (vm_error) { 465 ResourceMark rm; 466 const char* repository_path = _path; 467 const size_t repository_path_len = repository_path != NULL ? strlen(repository_path) : 0; 468 const char* const path = emergency_path(repository_path, repository_path_len); 469 _chunkwriter->set_chunk_path(path); 470 } 471 return _chunkwriter->open(); 472 } 473 474 size_t JfrRepository::close_chunk(jlong metadata_offset) { 475 return _chunkwriter->close(metadata_offset); 476 }