jdk8-mips64-public/hotspot: src/share/vm/jfr/recorder/service/jfrRecorderService.cpp@8e875c964f41 (annotated)

src/share/vm/jfr/recorder/service/jfrRecorderService.cpp@8e875c964f41 (annotated)

src/share/vm/jfr/recorder/service/jfrRecorderService.cpp

Wed, 09 Oct 2019 16:11:58 +0800

author: ddong
date: Wed, 09 Oct 2019 16:11:58 +0800
changeset 9885: 8e875c964f41
parent 9875: 6388d0d497f7
child 9947: db357034b763
permissions: -rw-r--r--

8214542: JFR: Old Object Sample event slow on a deep heap in debug builds
Reviewed-by: egahlin, rwestberg

 /*
  * Copyright (c) 2016, 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/jni/jfrJavaSupport.hpp"
 #include "jfr/leakprofiler/leakProfiler.hpp"
 #include "jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp"
 #include "jfr/leakprofiler/sampling/objectSampler.hpp"
 #include "jfr/recorder/jfrRecorder.hpp"
 #include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"
 #include "jfr/recorder/checkpoint/jfrMetadataEvent.hpp"
 #include "jfr/recorder/repository/jfrChunkRotation.hpp"
 #include "jfr/recorder/repository/jfrChunkWriter.hpp"
 #include "jfr/recorder/repository/jfrRepository.hpp"
 #include "jfr/recorder/service/jfrPostBox.hpp"
 #include "jfr/recorder/service/jfrRecorderService.hpp"
 #include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
 #include "jfr/recorder/storage/jfrStorage.hpp"
 #include "jfr/recorder/storage/jfrStorageControl.hpp"
 #include "jfr/recorder/stringpool/jfrStringPool.hpp"
 #include "jfr/utilities/jfrAllocation.hpp"
 #include "jfr/utilities/jfrTime.hpp"
 #include "jfr/writers/jfrJavaEventWriter.hpp"
 #include "jfr/utilities/jfrTypes.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/atomic.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/orderAccess.hpp"
 #include "runtime/os.hpp"
 #include "runtime/safepoint.hpp"
 #include "runtime/thread.inline.hpp"
 #include "runtime/vm_operations.hpp"
 #include "runtime/vmThread.hpp"
 // set data iff *dest == NULL
 static bool try_set(void* const data, void** dest, bool clear) {
   assert(data != NULL, "invariant");
   void* const current = OrderAccess::load_ptr_acquire(dest);
   if (current != NULL) {
     if (current != data) {
       // already set
       return false;
     }
     assert(current == data, "invariant");
     if (!clear) {
       // recursion disallowed
       return false;
     }
   }
   return Atomic::cmpxchg_ptr(clear ? NULL : data, dest, current) == current;
 }
 static void* rotation_thread = NULL;
 static const int rotation_try_limit = 1000;
 static const int rotation_retry_sleep_millis = 10;
 class RotationLock : public StackObj {
  private:
   Thread* const _thread;
   bool _acquired;
   void log(bool recursion) {
     assert(!_acquired, "invariant");
     const char* error_msg = NULL;
     if (recursion) {
       error_msg = "Unable to issue rotation due to recursive calls.";
     }
     else {
       error_msg = "Unable to issue rotation due to wait timeout.";
     }
     if (LogJFR) tty->print_cr( // For user, should not be "jfr, system"
       "%s", error_msg);
   }
  public:
   RotationLock(Thread* thread) : _thread(thread), _acquired(false) {
     assert(_thread != NULL, "invariant");
     if (_thread == rotation_thread) {
       // recursion not supported
       log(true);
       return;
     }
     // limited to not spin indefinitely
     for (int i = 0; i < rotation_try_limit; ++i) {
       if (try_set(_thread, &rotation_thread, false)) {
         _acquired = true;
         assert(_thread == rotation_thread, "invariant");
         return;
       }
       if (_thread->is_Java_thread()) {
         // in order to allow the system to move to a safepoint
         MutexLockerEx msg_lock(JfrMsg_lock);
         JfrMsg_lock->wait(false, rotation_retry_sleep_millis);
       }
       else {
         os::naked_short_sleep(rotation_retry_sleep_millis);
       }
     }
     log(false);
   }
   ~RotationLock() {
     assert(_thread != NULL, "invariant");
     if (_acquired) {
       assert(_thread == rotation_thread, "invariant");
       while (!try_set(_thread, &rotation_thread, true));
     }
   }
   bool not_acquired() const { return !_acquired; }
 };
 static intptr_t write_checkpoint_event_prologue(JfrChunkWriter& cw, u8 type_id) {
   const intptr_t prev_cp_offset = cw.previous_checkpoint_offset();
   const intptr_t prev_cp_relative_offset = 0 == prev_cp_offset ? 0 : prev_cp_offset - cw.current_offset();
   cw.reserve(sizeof(u4));
   cw.write<u8>(EVENT_CHECKPOINT);
   cw.write(JfrTicks::now());
   cw.write<jlong>((jlong)0);
   cw.write<jlong>((jlong)prev_cp_relative_offset); // write previous checkpoint offset delta
   cw.write<bool>(false); // flushpoint
   cw.write<u4>((u4)1); // nof types in this checkpoint
   cw.write<u8>(type_id);
   const intptr_t number_of_elements_offset = cw.current_offset();
   cw.reserve(sizeof(u4));
   return number_of_elements_offset;
 }
 template <typename ContentFunctor>
 class WriteCheckpointEvent : public StackObj {
  private:
   JfrChunkWriter& _cw;
   u8 _type_id;
   ContentFunctor& _content_functor;
  public:
   WriteCheckpointEvent(JfrChunkWriter& cw, u8 type_id, ContentFunctor& functor) :
     _cw(cw),
     _type_id(type_id),
     _content_functor(functor) {
     assert(_cw.is_valid(), "invariant");
   }
   bool process() {
     // current_cp_offset is also offset for the event size header field
     const intptr_t current_cp_offset = _cw.current_offset();
     const intptr_t num_elements_offset = write_checkpoint_event_prologue(_cw, _type_id);
     // invocation
     _content_functor.process();
     const u4 number_of_elements = (u4)_content_functor.processed();
     if (number_of_elements == 0) {
       // nothing to do, rewind writer to start
       _cw.seek(current_cp_offset);
       return true;
     }
     assert(number_of_elements > 0, "invariant");
     assert(_cw.current_offset() > num_elements_offset, "invariant");
     _cw.write_padded_at_offset<u4>(number_of_elements, num_elements_offset);
     _cw.write_padded_at_offset<u4>((u4)_cw.current_offset() - current_cp_offset, current_cp_offset);
     // update writer with last checkpoint position
     _cw.set_previous_checkpoint_offset(current_cp_offset);
     return true;
   }
 };
 template <typename Instance, size_t(Instance::*func)()>
 class ServiceFunctor {
  private:
   Instance& _instance;
   size_t _processed;
  public:
   ServiceFunctor(Instance& instance) : _instance(instance), _processed(0) {}
   bool process() {
     _processed = (_instance.*func)();
     return true;
   }
   size_t processed() const { return _processed; }
 };
 template <typename Instance, void(Instance::*func)()>
 class JfrVMOperation : public VM_Operation {
  private:
   Instance& _instance;
  public:
   JfrVMOperation(Instance& instance) : _instance(instance) {}
   void doit() { (_instance.*func)(); }
   VMOp_Type type() const { return VMOp_JFRCheckpoint; }
   Mode evaluation_mode() const { return _safepoint; } // default
 };
 class WriteStackTraceRepository : public StackObj {
  private:
   JfrStackTraceRepository& _repo;
   JfrChunkWriter& _cw;
   size_t _elements_processed;
   bool _clear;
  public:
   WriteStackTraceRepository(JfrStackTraceRepository& repo, JfrChunkWriter& cw, bool clear) :
     _repo(repo), _cw(cw), _elements_processed(0), _clear(clear) {}
   bool process() {
     _elements_processed = _repo.write(_cw, _clear);
     return true;
   }
   size_t processed() const { return _elements_processed; }
   void reset() { _elements_processed = 0; }
 };
 static bool recording = false;
 static void set_recording_state(bool is_recording) {
   OrderAccess::storestore();
   recording = is_recording;
 }
 bool JfrRecorderService::is_recording() {
   return recording;
 }
 JfrRecorderService::JfrRecorderService() :
   _checkpoint_manager(JfrCheckpointManager::instance()),
   _chunkwriter(JfrRepository::chunkwriter()),
   _repository(JfrRepository::instance()),
   _storage(JfrStorage::instance()),
   _stack_trace_repository(JfrStackTraceRepository::instance()),
   _string_pool(JfrStringPool::instance()) {}
 void JfrRecorderService::start() {
   RotationLock rl(Thread::current());
   if (rl.not_acquired()) {
     return;
   }
   if (LogJFR) tty->print_cr("Request to START recording");
   assert(!is_recording(), "invariant");
   clear();
   set_recording_state(true);
   assert(is_recording(), "invariant");
   open_new_chunk();
   if (LogJFR) tty->print_cr("Recording STARTED");
 }
 void JfrRecorderService::clear() {
   ResourceMark rm;
   HandleMark hm;
   pre_safepoint_clear();
   invoke_safepoint_clear();
   post_safepoint_clear();
 }
 void JfrRecorderService::pre_safepoint_clear() {
   _stack_trace_repository.clear();
   _string_pool.clear();
   _storage.clear();
 }
 void JfrRecorderService::invoke_safepoint_clear() {
   JfrVMOperation<JfrRecorderService, &JfrRecorderService::safepoint_clear> safepoint_task(*this);
   VMThread::execute(&safepoint_task);
 }
 //
 // safepoint clear sequence
 //
 //  clear stacktrace repository ->
 //    clear string pool ->
 //      clear storage ->
 //        shift epoch ->
 //          update time
 //
 void JfrRecorderService::safepoint_clear() {
   assert(SafepointSynchronize::is_at_safepoint(), "invariant");
   _stack_trace_repository.clear();
   _string_pool.clear();
   _storage.clear();
   _checkpoint_manager.shift_epoch();
   _chunkwriter.time_stamp_chunk_now();
 }
 void JfrRecorderService::post_safepoint_clear() {
   _checkpoint_manager.clear();
 }
 static void stop() {
   assert(JfrRecorderService::is_recording(), "invariant");
   if (LogJFR) tty->print_cr("Recording STOPPED");
   set_recording_state(false);
   assert(!JfrRecorderService::is_recording(), "invariant");
 }
 void JfrRecorderService::rotate(int msgs) {
   RotationLock rl(Thread::current());
   if (rl.not_acquired()) {
     return;
   }
   static bool vm_error = false;
   if (msgs & MSGBIT(MSG_VM_ERROR)) {
     vm_error = true;
     prepare_for_vm_error_rotation();
   }
   if (msgs & (MSGBIT(MSG_STOP))) {
     stop();
   }
   // action determined by chunkwriter state
   if (!_chunkwriter.is_valid()) {
     in_memory_rotation();
     return;
   }
   if (vm_error) {
     vm_error_rotation();
     return;
   }
   chunk_rotation();
 }
 void JfrRecorderService::prepare_for_vm_error_rotation() {
   if (!_chunkwriter.is_valid()) {
     open_new_chunk(true);
   }
   _checkpoint_manager.register_service_thread(Thread::current());
   JfrMetadataEvent::lock();
 }
 void JfrRecorderService::open_new_chunk(bool vm_error) {
   assert(!_chunkwriter.is_valid(), "invariant");
   assert(!JfrStream_lock->owned_by_self(), "invariant");
   JfrChunkRotation::on_rotation();
   MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
   if (!_repository.open_chunk(vm_error)) {
     assert(!_chunkwriter.is_valid(), "invariant");
     _storage.control().set_to_disk(false);
     return;
   }
   assert(_chunkwriter.is_valid(), "invariant");
   _storage.control().set_to_disk(true);
 }
 void JfrRecorderService::in_memory_rotation() {
   assert(!_chunkwriter.is_valid(), "invariant");
   // currently running an in-memory recording
   open_new_chunk();
   if (_chunkwriter.is_valid()) {
     // dump all in-memory buffer data to the newly created chunk
     serialize_storage_from_in_memory_recording();
   }
 }
 void JfrRecorderService::serialize_storage_from_in_memory_recording() {
   assert(!JfrStream_lock->owned_by_self(), "not holding stream lock!");
   MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
   _storage.write();
 }
 void JfrRecorderService::chunk_rotation() {
   finalize_current_chunk();
   open_new_chunk();
 }
 void JfrRecorderService::finalize_current_chunk() {
   assert(_chunkwriter.is_valid(), "invariant");
   write();
   assert(!_chunkwriter.is_valid(), "invariant");
 }
 void JfrRecorderService::write() {
   ResourceMark rm;
   HandleMark hm;
   pre_safepoint_write();
   invoke_safepoint_write();
   post_safepoint_write();
 }
 typedef ServiceFunctor<JfrStringPool, &JfrStringPool::write> WriteStringPool;
 typedef ServiceFunctor<JfrStringPool, &JfrStringPool::write_at_safepoint> WriteStringPoolSafepoint;
 typedef WriteCheckpointEvent<WriteStackTraceRepository> WriteStackTraceCheckpoint;
 typedef WriteCheckpointEvent<WriteStringPool> WriteStringPoolCheckpoint;
 typedef WriteCheckpointEvent<WriteStringPoolSafepoint> WriteStringPoolCheckpointSafepoint;
 static void write_stacktrace_checkpoint(JfrStackTraceRepository& stack_trace_repo, JfrChunkWriter& chunkwriter, bool clear) {
   WriteStackTraceRepository write_stacktrace_repo(stack_trace_repo, chunkwriter, clear);
   WriteStackTraceCheckpoint write_stack_trace_checkpoint(chunkwriter, TYPE_STACKTRACE, write_stacktrace_repo);
   write_stack_trace_checkpoint.process();
 }
 static void write_object_sample_stacktrace(ObjectSampler* sampler, JfrStackTraceRepository& stack_trace_repository) {
   WriteObjectSampleStacktrace object_sample_stacktrace(sampler, stack_trace_repository);
   object_sample_stacktrace.process();
 }
 static void write_stringpool_checkpoint(JfrStringPool& string_pool, JfrChunkWriter& chunkwriter) {
   WriteStringPool write_string_pool(string_pool);
   WriteStringPoolCheckpoint write_string_pool_checkpoint(chunkwriter, TYPE_STRING, write_string_pool);
   write_string_pool_checkpoint.process();
 }
 static void write_stringpool_checkpoint_safepoint(JfrStringPool& string_pool, JfrChunkWriter& chunkwriter) {
   WriteStringPoolSafepoint write_string_pool(string_pool);
   WriteStringPoolCheckpointSafepoint write_string_pool_checkpoint(chunkwriter, TYPE_STRING, write_string_pool);
   write_string_pool_checkpoint.process();
 }
 //
 // pre-safepoint write sequence
 //
 //  lock stream lock ->
 //    write non-safepoint dependent types ->
 //      write checkpoint epoch transition list->
 //        write stack trace checkpoint ->
 //          write string pool checkpoint ->
 //            write object sample stacktraces ->
 //              write storage ->
 //                release stream lock
 //
 void JfrRecorderService::pre_safepoint_write() {
   MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
   assert(_chunkwriter.is_valid(), "invariant");
   _checkpoint_manager.write_types();
   _checkpoint_manager.write_epoch_transition_mspace();
   write_stacktrace_checkpoint(_stack_trace_repository, _chunkwriter, false);
   write_stringpool_checkpoint(_string_pool, _chunkwriter);
   if (LeakProfiler::is_running()) {
     // Exclusive access to the object sampler instance.
     // The sampler is released (unlocked) later in post_safepoint_write.
     ObjectSampler* const sampler = ObjectSampler::acquire();
     assert(sampler != NULL, "invariant");
     write_object_sample_stacktrace(sampler, _stack_trace_repository);
   }
   _storage.write();
 }
 void JfrRecorderService::invoke_safepoint_write() {
   JfrVMOperation<JfrRecorderService, &JfrRecorderService::safepoint_write> safepoint_task(*this);
   VMThread::execute(&safepoint_task);
 }
 //
 // safepoint write sequence
 //
 //   lock stream lock ->
 //       write stacktrace repository ->
 //         write string pool ->
 //           write safepoint dependent types ->
 //             write storage ->
 //                 shift_epoch ->
 //                   update time ->
 //                     lock metadata descriptor ->
 //                       release stream lock
 //
 void JfrRecorderService::safepoint_write() {
   assert(SafepointSynchronize::is_at_safepoint(), "invariant");
   MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
   write_stacktrace_checkpoint(_stack_trace_repository, _chunkwriter, true);
   write_stringpool_checkpoint_safepoint(_string_pool, _chunkwriter);
   _checkpoint_manager.write_safepoint_types();
   _storage.write_at_safepoint();
   _checkpoint_manager.shift_epoch();
   _chunkwriter.time_stamp_chunk_now();
   JfrMetadataEvent::lock();
 }
 static jlong write_metadata_event(JfrChunkWriter& chunkwriter) {
   assert(chunkwriter.is_valid(), "invariant");
   const jlong metadata_offset = chunkwriter.current_offset();
   JfrMetadataEvent::write(chunkwriter, metadata_offset);
   return metadata_offset;
 }
 //
 // post-safepoint write sequence
 //
 //   write type set ->
 //     release object sampler ->
 //       lock stream lock ->
 //         write checkpoints ->
 //           write metadata event ->
 //             write chunk header ->
 //               close chunk fd ->
 //                 release stream lock
 //
 void JfrRecorderService::post_safepoint_write() {
   assert(_chunkwriter.is_valid(), "invariant");
   // During the safepoint tasks just completed, the system transitioned to a new epoch.
   // Type tagging is epoch relative which entails we are able to write out the
   // already tagged artifacts for the previous epoch. We can accomplish this concurrently
   // with threads now tagging artifacts in relation to the new, now updated, epoch and remain outside of a safepoint.
   _checkpoint_manager.write_type_set();
   if (LeakProfiler::is_running()) {
     // The object sampler instance was exclusively acquired and locked in pre_safepoint_write.
     // Note: There is a dependency on write_type_set() above, ensure the release is subsequent.
     ObjectSampler::release();
   }  MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
   // serialize any outstanding checkpoint memory
   _checkpoint_manager.write();
   // serialize the metadata descriptor event and close out the chunk
   _repository.close_chunk(write_metadata_event(_chunkwriter));
   assert(!_chunkwriter.is_valid(), "invariant");
 }
 void JfrRecorderService::vm_error_rotation() {
   if (_chunkwriter.is_valid()) {
     finalize_current_chunk_on_vm_error();
     assert(!_chunkwriter.is_valid(), "invariant");
     _repository.on_vm_error();
   }
 }
 void JfrRecorderService::finalize_current_chunk_on_vm_error() {
   assert(_chunkwriter.is_valid(), "invariant");
   pre_safepoint_write();
   // Do not attempt safepoint dependent operations during emergency dump.
   // Optimistically write tagged artifacts.
   _checkpoint_manager.shift_epoch();
   // update time
   _chunkwriter.time_stamp_chunk_now();
   post_safepoint_write();
   assert(!_chunkwriter.is_valid(), "invariant");
 }
 void JfrRecorderService::process_full_buffers() {
   if (_chunkwriter.is_valid()) {
     assert(!JfrStream_lock->owned_by_self(), "invariant");
     MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
     _storage.write_full();
   }
 }
 void JfrRecorderService::scavenge() {
   _storage.scavenge();
 }
 void JfrRecorderService::evaluate_chunk_size_for_rotation() {
   JfrChunkRotation::evaluate(_chunkwriter);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/jfr/recorder/service/jfrRecorderService.cpp@8e875c964f41 (annotated)

src/share/vm/jfr/recorder/service/jfrRecorderService.cpp