Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "jfr/jfr.hpp"

 #include "jfr/jni/jfrJavaSupport.hpp"

 #include "jfr/recorder/jfrRecorder.hpp"

 #include "jfr/recorder/repository/jfrChunkState.hpp"

 #include "jfr/recorder/repository/jfrChunkWriter.hpp"

 #include "jfr/recorder/repository/jfrRepository.hpp"

 #include "jfr/recorder/service/jfrPostBox.hpp"

 #include "memory/resourceArea.hpp"

 #include "runtime/mutex.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/os.hpp"

 #include "runtime/thread.inline.hpp"

 static JfrRepository* _instance = NULL;

 JfrRepository& JfrRepository::instance() {

   return *_instance;

 }

 static JfrChunkWriter* _chunkwriter = NULL;

 static bool initialize_chunkwriter() {

   assert(_chunkwriter == NULL, "invariant");

   _chunkwriter = new JfrChunkWriter();

   return _chunkwriter != NULL && _chunkwriter->initialize();

 }

 JfrChunkWriter& JfrRepository::chunkwriter() {

   return *_chunkwriter;

 }

 JfrRepository::JfrRepository(JfrPostBox& post_box) : _path(NULL), _post_box(post_box) {}

 bool JfrRepository::initialize() {

   return initialize_chunkwriter();

 }

 JfrRepository::~JfrRepository() {

   if (_path != NULL) {

     JfrCHeapObj::free(_path, strlen(_path) + 1);

     _path = NULL;

   }

   if (_chunkwriter != NULL) {

     delete _chunkwriter;

     _chunkwriter = NULL;

   }

 }

 JfrRepository* JfrRepository::create(JfrPostBox& post_box) {

   assert(_instance == NULL, "invariant");

   _instance = new JfrRepository(post_box);

   return _instance;

 }

 void JfrRepository::destroy() {

   assert(_instance != NULL, "invariant");

   delete _instance;

   _instance = NULL;

 }

 static const char vm_error_filename_fmt[] = "hs_err_pid%p.jfr";

 static const char vm_oom_filename_fmt[] = "hs_oom_pid%p.jfr";

 static const char vm_soe_filename_fmt[] = "hs_soe_pid%p.jfr";

 static const char chunk_file_jfr_ext[] = ".jfr";

 static const size_t iso8601_len = 19; // "YYYY-MM-DDTHH:MM:SS"

 static fio_fd open_exclusivly(const char* path) {

   return os::open(path, O_CREAT | O_WRONLY, S_IREAD | S_IWRITE);

 }

 static fio_fd open_existing(const char* path) {

   return os::open(path, O_RDWR, S_IREAD | S_IWRITE);

 }

 static int file_sort(const char** const file1, const char** file2) {

   assert(NULL != *file1 && NULL != *file2, "invariant");

   int cmp = strncmp(*file1, *file2, iso8601_len);

   if (0 == cmp) {

     const char* const dot1 = strchr(*file1, '.');

     assert(NULL != dot1, "invariant");

     const char* const dot2 = strchr(*file2, '.');

     assert(NULL != dot2, "invariant");

     ptrdiff_t file1_len = dot1 - *file1;

     ptrdiff_t file2_len = dot2 - *file2;

     if (file1_len < file2_len) {

       return -1;

     }

     if (file1_len > file2_len) {

       return 1;

     }

     assert(file1_len == file2_len, "invariant");

     cmp = strncmp(*file1, *file2, file1_len);

   }

   assert(cmp != 0, "invariant");

   return cmp;

 }

 static void iso8601_to_date_time(char* iso8601_str) {

   assert(iso8601_str != NULL, "invariant");

   assert(strlen(iso8601_str) == iso8601_len, "invariant");

   // "YYYY-MM-DDTHH:MM:SS"

   for (size_t i = 0; i < iso8601_len; ++i) {

     switch(iso8601_str[i]) {

       case 'T' :

       case '-' :

       case ':' :

         iso8601_str[i] = '_';

         break;

     }

   }

   // "YYYY_MM_DD_HH_MM_SS"

 }

 static void date_time(char* buffer, size_t buffer_len) {

   assert(buffer != NULL, "invariant");

   assert(buffer_len >= iso8601_len, "buffer too small");

   os::iso8601_time(buffer, buffer_len);

   assert(strlen(buffer) >= iso8601_len + 1, "invariant");

   // "YYYY-MM-DDTHH:MM:SS"

   buffer[iso8601_len] = '\0';

   iso8601_to_date_time(buffer);

 }

 static jlong file_size(fio_fd fd) {

   assert(fd != invalid_fd, "invariant");

   const jlong current_offset = os::current_file_offset(fd);

   const jlong size = os::lseek(fd, 0, SEEK_END);

   os::seek_to_file_offset(fd, current_offset);

   return size;

 }

 class RepositoryIterator : public StackObj {

  private:

   const char* const _repo;

   const size_t _repository_len;

   GrowableArray<const char*>* _files;

   const char* const fully_qualified(const char* entry) const;

   mutable int _iterator;

  public:

    RepositoryIterator(const char* repository, size_t repository_len);

    ~RepositoryIterator() {}

   debug_only(void print_repository_files() const;)

   const char* const filter(const char* entry) const;

   bool has_next() const;

   const char* const next() const;

 };

 const char* const RepositoryIterator::fully_qualified(const char* entry) const {

   assert(NULL != entry, "invariant");

   char* file_path_entry = NULL;

    // only use files that have content, not placeholders

   const char* const file_separator = os::file_separator();

   if (NULL != file_separator) {

     const size_t entry_len = strlen(entry);

     const size_t file_separator_length = strlen(file_separator);

     const size_t file_path_entry_length = _repository_len + file_separator_length + entry_len;

     file_path_entry = NEW_RESOURCE_ARRAY_RETURN_NULL(char, file_path_entry_length + 1);

     if (NULL == file_path_entry) {

       return NULL;

     }

     int position = 0;

     position += jio_snprintf(&file_path_entry[position], _repository_len + 1, "%s", _repo);

     position += jio_snprintf(&file_path_entry[position], file_separator_length + 1, "%s", os::file_separator());

     position += jio_snprintf(&file_path_entry[position], entry_len + 1, "%s", entry);

     file_path_entry[position] = '\0';

     assert((size_t)position == file_path_entry_length, "invariant");

     assert(strlen(file_path_entry) == (size_t)position, "invariant");

   }

   return file_path_entry;

 }

 const char* const RepositoryIterator::filter(const char* entry) const {

   if (entry == NULL) {

     return NULL;

   }

   const size_t entry_len = strlen(entry);

   if (entry_len <= 2) {

     // for "." and ".."

     return NULL;

   }

   char* entry_name = NEW_RESOURCE_ARRAY_RETURN_NULL(char, entry_len + 1);

   if (entry_name == NULL) {

     return NULL;

   }

   strncpy(entry_name, entry, entry_len);

   entry_name[entry_len] = '\0';

   const char* const fully_qualified_path_entry = fully_qualified(entry_name);

   if (NULL == fully_qualified_path_entry) {

     return NULL;

   }

   const fio_fd entry_fd = open_existing(fully_qualified_path_entry);

   if (invalid_fd == entry_fd) {

     return NULL;

   }

   const jlong entry_size = file_size(entry_fd);

   os::close(entry_fd);

   if (0 == entry_size) {

     return NULL;

   }

   return entry_name;

 }

 RepositoryIterator::RepositoryIterator(const char* repository, size_t repository_len) :

   _repo(repository),

   _repository_len(repository_len),

   _files(NULL),

   _iterator(0) {

   if (NULL != _repo) {

     assert(strlen(_repo) == _repository_len, "invariant");

     _files = new GrowableArray<const char*>(10);

     DIR* dirp = os::opendir(_repo);

     if (dirp == NULL) {

       if (true) tty->print_cr("Unable to open repository %s", _repo);

       return;

     }

     struct dirent* dentry;

     while ((dentry = os::readdir(dirp)) != NULL) {

       const char* const entry_path = filter(dentry->d_name);

       if (NULL != entry_path) {

         _files->append(entry_path);

       }

     }

     os::closedir(dirp);

     if (_files->length() > 1) {

       _files->sort(file_sort);

     }

   }

 }

 #ifdef ASSERT

 void RepositoryIterator::print_repository_files() const {

   while (has_next()) {

     if (true) tty->print_cr( "%s", next());

   }

 }

 #endif

 bool RepositoryIterator::has_next() const {

   return (_files != NULL && _iterator < _files->length());

 }

 const char* const RepositoryIterator::next() const {

   return _iterator >= _files->length() ? NULL : fully_qualified(_files->at(_iterator++));

 }

 static void write_emergency_file(fio_fd emergency_fd, const RepositoryIterator& iterator) {

   assert(emergency_fd != invalid_fd, "invariant");

   const size_t size_of_file_copy_block = 1 * M; // 1 mb

   jbyte* const file_copy_block = NEW_RESOURCE_ARRAY_RETURN_NULL(jbyte, size_of_file_copy_block);

   if (file_copy_block == NULL) {

     return;

   }

  jlong bytes_written_total = 0;

   while (iterator.has_next()) {

     fio_fd current_fd = invalid_fd;

     const char* const fqn = iterator.next();

     if (fqn != NULL) {

       current_fd = open_existing(fqn);

       if (current_fd != invalid_fd) {

         const jlong current_filesize = file_size(current_fd);

         assert(current_filesize > 0, "invariant");

         jlong bytes_read = 0;

         jlong bytes_written = 0;

         while (bytes_read < current_filesize) {

           bytes_read += (jlong)os::read_at(current_fd, file_copy_block, size_of_file_copy_block, bytes_read);

           assert(bytes_read - bytes_written <= (jlong)size_of_file_copy_block, "invariant");

           bytes_written += (jlong)os::write(emergency_fd, file_copy_block, bytes_read - bytes_written);

           assert(bytes_read == bytes_written, "invariant");

         }

         os::close(current_fd);

         bytes_written_total += bytes_written;

       }

     }

   }

 }

 static const char* create_emergency_dump_path() {

   assert(JfrStream_lock->owned_by_self(), "invariant");

   char* buffer = NEW_RESOURCE_ARRAY_RETURN_NULL(char, O_BUFLEN);

   if (NULL == buffer) {

     return NULL;

   }

   const char* const cwd = os::get_current_directory(buffer, O_BUFLEN);

   if (NULL == cwd) {

     return NULL;

   }

   size_t pos = strlen(cwd);

   const int fsep_len = jio_snprintf(&buffer[pos], O_BUFLEN - pos, "%s", os::file_separator());

   const char* filename_fmt = NULL;

   // fetch specific error cause

   switch (JfrJavaSupport::cause()) {

     case JfrJavaSupport::OUT_OF_MEMORY:

       filename_fmt = vm_oom_filename_fmt;

       break;

     case JfrJavaSupport::STACK_OVERFLOW:

       filename_fmt = vm_soe_filename_fmt;

       break;

     default:

       filename_fmt = vm_error_filename_fmt;

   }

   char* emergency_dump_path = NULL;

   pos += fsep_len;

   if (Arguments::copy_expand_pid(filename_fmt, strlen(filename_fmt), &buffer[pos], O_BUFLEN - pos)) {

     const size_t emergency_filename_length = strlen(buffer);

     emergency_dump_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, emergency_filename_length + 1);

     if (NULL == emergency_dump_path) {

       return NULL;

     }

     strncpy(emergency_dump_path, buffer, emergency_filename_length);

     emergency_dump_path[emergency_filename_length] = '\0';

   }

   return emergency_dump_path;

 }

 // Caller needs ResourceMark

 static const char* create_emergency_chunk_path(const char* repository_base, size_t repository_len) {

   assert(repository_base != NULL, "invariant");

   assert(JfrStream_lock->owned_by_self(), "invariant");

   // date time

   char date_time_buffer[32] = {0};

   date_time(date_time_buffer, sizeof(date_time_buffer));

   size_t date_time_len = strlen(date_time_buffer);

   size_t chunkname_max_len = repository_len               // repository_base

                              + 1                          // "/"

                              + date_time_len              // date_time

                              + strlen(chunk_file_jfr_ext) // .jfr

                              + 1;

   char* chunk_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, chunkname_max_len);

   if (chunk_path == NULL) {

     return NULL;

   }

   // append the individual substrings

   jio_snprintf(chunk_path, chunkname_max_len, "%s%s%s%s", repository_base, os::file_separator(), date_time_buffer, chunk_file_jfr_ext);

   return chunk_path;

 }

 static fio_fd emergency_dump_file() {

   assert(JfrStream_lock->owned_by_self(), "invariant");

   ResourceMark rm;

   const char* const emergency_dump_path = create_emergency_dump_path();

   if (emergency_dump_path == NULL) {

     return invalid_fd;

   }

   const fio_fd fd = open_exclusivly(emergency_dump_path);

   if (fd != invalid_fd) {

     if (LogJFR) tty->print_cr( // For user, should not be "jfr, system"

       "Attempting to recover JFR data, emergency jfr file: %s", emergency_dump_path);

   }

   return fd;

 }

 static const char* emergency_path(const char* repository, size_t repository_len) {

   return repository == NULL ? create_emergency_dump_path() : create_emergency_chunk_path(repository, repository_len);

 }

 void JfrRepository::on_vm_error() {

   assert(!JfrStream_lock->owned_by_self(), "invariant");

   const char* path = _path;

   if (path == NULL) {

     // completed already

     return;

   }

   ResourceMark rm;

   MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);

   const fio_fd emergency_fd = emergency_dump_file();

   if (emergency_fd != invalid_fd) {

     RepositoryIterator iterator(path, strlen(path));

     write_emergency_file(emergency_fd, iterator);

     os::close(emergency_fd);

   }

 }

 bool JfrRepository::set_path(const char* path) {

   assert(path != NULL, "trying to set the repository path with a NULL string!");

   if (_path != NULL) {

     // delete existing

     JfrCHeapObj::free(_path, strlen(_path) + 1);

   }

   const size_t path_len = strlen(path);

   _path = JfrCHeapObj::new_array<char>(path_len + 1);

   if (_path == NULL) {

     return false;

   }

   strncpy(_path, path, path_len);

   _path[path_len] = '\0';

   return true;

 }

 void JfrRepository::set_chunk_path(const char* path) {

   assert(JfrStream_lock->owned_by_self(), "invariant");

   chunkwriter().set_chunk_path(path);

 }

 void JfrRepository::notify_on_new_chunk_path() {

   if (Jfr::is_recording()) {

     instance()._post_box.post(MSG_ROTATE);

   }

 }

 /**

 * Sets the file where data should be written.

 *

 * Recording  Previous  Current  Action

 * ==============================================

 *   true     null      null     Ignore, keep recording in-memory

 *   true     null      file1    Start disk recording

 *   true     file      null     Copy out metadata to disk and continue in-memory recording

 *   true     file1     file2    Copy out metadata and start with new File (file2)

 *   false     *        null     Ignore, but start recording to memory

 *   false     *        file     Ignore, but start recording to disk

 */

 void JfrRepository::set_chunk_path(jstring path, JavaThread* jt) {

   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt));

   ResourceMark rm(jt);

   const char* const canonical_chunk_path = JfrJavaSupport::c_str(path, jt);

   {

     MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);

     if (NULL == canonical_chunk_path && !_chunkwriter->is_valid()) {

       // new output is NULL and current output is NULL

       return;

     }

     instance().set_chunk_path(canonical_chunk_path);

   }

   notify_on_new_chunk_path();

 }

 void JfrRepository::set_path(jstring location, JavaThread* jt) {

   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt));

   ResourceMark rm(jt);

   const char* const path = JfrJavaSupport::c_str(location, jt);

   if (path != NULL) {

     instance().set_path(path);

   }

 }

 bool JfrRepository::open_chunk(bool vm_error /* false */) {

   assert(JfrStream_lock->owned_by_self(), "invariant");

   if (vm_error) {

     ResourceMark rm;

     const char* repository_path = _path;

     const size_t repository_path_len = repository_path != NULL ? strlen(repository_path) : 0;

     const char* const path = emergency_path(repository_path, repository_path_len);

     _chunkwriter->set_chunk_path(path);

   }

   return _chunkwriter->open();

 }

 size_t JfrRepository::close_chunk(jlong metadata_offset) {

   return _chunkwriter->close(metadata_offset);

 }