jdk8-mips64-public/hotspot: src/share/vm/jfr/recorder/checkpoint/jfrCheckpointManager.cpp@d2c2cd90513e (annotated)

src/share/vm/jfr/recorder/checkpoint/jfrCheckpointManager.cpp@d2c2cd90513e (annotated)

src/share/vm/jfr/recorder/checkpoint/jfrCheckpointManager.cpp

Wed, 17 Jun 2020 11:43:05 +0300

author: apetushkov
date: Wed, 17 Jun 2020 11:43:05 +0300
changeset 9928: d2c2cd90513e
parent 9858: b985cbb00e68
permissions: -rw-r--r--

8220293: Deadlock in JFR string pool
Reviewed-by: rehn, egahlin

 /*
  * Copyright (c) 2016, 2019, 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 "classfile/javaClasses.hpp"
 #include "jfr/recorder/jfrRecorder.hpp"
 #include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"
 #include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
 #include "jfr/recorder/checkpoint/types/jfrTypeManager.hpp"
 #include "jfr/recorder/checkpoint/types/traceid/jfrTraceIdEpoch.hpp"
 #include "jfr/recorder/service/jfrOptionSet.hpp"
 #include "jfr/recorder/storage/jfrMemorySpace.inline.hpp"
 #include "jfr/recorder/storage/jfrStorageUtils.inline.hpp"
 #include "jfr/recorder/repository/jfrChunkWriter.hpp"
 #include "jfr/utilities/jfrBigEndian.hpp"
 #include "jfr/utilities/jfrTypes.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/orderAccess.inline.hpp"
 #include "runtime/os.hpp"
 #include "runtime/safepoint.hpp"
 typedef JfrCheckpointManager::Buffer* BufferPtr;
 static JfrCheckpointManager* _instance = NULL;
 JfrCheckpointManager& JfrCheckpointManager::instance() {
   return *_instance;
 }
 JfrCheckpointManager* JfrCheckpointManager::create(JfrChunkWriter& cw) {
   assert(_instance == NULL, "invariant");
   _instance = new JfrCheckpointManager(cw);
   return _instance;
 }
 void JfrCheckpointManager::destroy() {
   assert(_instance != NULL, "invariant");
   delete _instance;
   _instance = NULL;
 }
 JfrCheckpointManager::JfrCheckpointManager(JfrChunkWriter& cw) :
   _free_list_mspace(NULL),
   _epoch_transition_mspace(NULL),
   _lock(NULL),
   _service_thread(NULL),
   _chunkwriter(cw),
   _checkpoint_epoch_state(JfrTraceIdEpoch::current()) {}
 JfrCheckpointManager::~JfrCheckpointManager() {
   if (_free_list_mspace != NULL) {
     delete _free_list_mspace;
   }
   if (_epoch_transition_mspace != NULL) {
     delete _epoch_transition_mspace;
   }
   if (_lock != NULL) {
     delete _lock;
   }
   JfrTypeManager::clear();
 }
 static const size_t unlimited_mspace_size = 0;
 static const size_t checkpoint_buffer_cache_count = 2;
 static const size_t checkpoint_buffer_size = 512 * K;
 static JfrCheckpointMspace* create_mspace(size_t buffer_size, size_t limit, size_t cache_count, JfrCheckpointManager* system) {
   JfrCheckpointMspace* mspace = new JfrCheckpointMspace(buffer_size, limit, cache_count, system);
   if (mspace != NULL) {
     mspace->initialize();
   }
   return mspace;
 }
 bool JfrCheckpointManager::initialize() {
   assert(_free_list_mspace == NULL, "invariant");
   _free_list_mspace = create_mspace(checkpoint_buffer_size, unlimited_mspace_size, checkpoint_buffer_cache_count, this);
   if (_free_list_mspace == NULL) {
     return false;
   }
   assert(_epoch_transition_mspace == NULL, "invariant");
   _epoch_transition_mspace = create_mspace(checkpoint_buffer_size, unlimited_mspace_size, checkpoint_buffer_cache_count, this);
   if (_epoch_transition_mspace == NULL) {
     return false;
   }
   assert(_lock == NULL, "invariant");
   _lock = new Mutex(Monitor::leaf - 1, "Checkpoint mutex", Mutex::_allow_vm_block_flag);
   if (_lock == NULL) {
     return false;
   }
   return JfrTypeManager::initialize();
 }
 bool JfrCheckpointManager::use_epoch_transition_mspace(const Thread* thread) const {
   return _service_thread != thread && OrderAccess::load_acquire((u1*)&_checkpoint_epoch_state) != JfrTraceIdEpoch::current();
 }
 void JfrCheckpointManager::synchronize_epoch() {
   assert(_checkpoint_epoch_state != JfrTraceIdEpoch::current(), "invariant");
   OrderAccess::storestore();
   _checkpoint_epoch_state = JfrTraceIdEpoch::current();
 }
 void JfrCheckpointManager::shift_epoch() {
   debug_only(const u1 current_epoch = JfrTraceIdEpoch::current();)
   JfrTraceIdEpoch::shift_epoch();
   assert(current_epoch != JfrTraceIdEpoch::current(), "invariant");
 }
 void JfrCheckpointManager::register_service_thread(const Thread* thread) {
   _service_thread = thread;
 }
 void JfrCheckpointManager::register_full(BufferPtr t, Thread* thread) {
   // nothing here at the moment
   assert(t != NULL, "invariant");
   assert(t->acquired_by(thread), "invariant");
   assert(t->retired(), "invariant");
 }
 void JfrCheckpointManager::lock() {
   assert(!_lock->owned_by_self(), "invariant");
   _lock->lock_without_safepoint_check();
 }
 void JfrCheckpointManager::unlock() {
   _lock->unlock();
 }
 #ifdef ASSERT
 bool JfrCheckpointManager::is_locked() const {
   return _lock->owned_by_self();
 }
 static void assert_free_lease(const BufferPtr buffer) {
   assert(buffer != NULL, "invariant");
   assert(buffer->acquired_by_self(), "invariant");
   assert(buffer->lease(), "invariant");
 }
 static void assert_release(const BufferPtr buffer) {
   assert(buffer != NULL, "invariant");
   assert(buffer->lease(), "invariant");
   assert(buffer->acquired_by_self(), "invariant");
 }
 #endif // ASSERT
 static BufferPtr lease_free(size_t size, JfrCheckpointMspace* mspace, size_t retry_count, Thread* thread) {
   static const size_t max_elem_size = mspace->min_elem_size(); // min is max
   BufferPtr buffer;
   if (size <= max_elem_size) {
     BufferPtr buffer = mspace_get_free_lease_with_retry(size, mspace, retry_count, thread);
     if (buffer != NULL) {
       DEBUG_ONLY(assert_free_lease(buffer);)
       return buffer;
     }
   }
   buffer = mspace_allocate_transient_lease_to_free(size, mspace, thread);
   DEBUG_ONLY(assert_free_lease(buffer);)
   return buffer;
 }
 static const size_t lease_retry = 10;
 BufferPtr JfrCheckpointManager::lease_buffer(Thread* thread, size_t size /* 0 */) {
   JfrCheckpointManager& manager = instance();
   if (manager.use_epoch_transition_mspace(thread)) {
     return lease_free(size, manager._epoch_transition_mspace, lease_retry, thread);
   }
   return lease_free(size, manager._free_list_mspace, lease_retry, thread);
 }
 /*
 * If the buffer was a "lease" from the free list, release back.
 *
 * The buffer is effectively invalidated for the thread post-return,
 * and the caller should take means to ensure that it is not referenced.
 */
 static void release(BufferPtr const buffer, Thread* thread) {
   DEBUG_ONLY(assert_release(buffer);)
   buffer->clear_lease();
   buffer->release();
 }
 BufferPtr JfrCheckpointManager::flush(BufferPtr old, size_t used, size_t requested, Thread* thread) {
   assert(old != NULL, "invariant");
   assert(old->lease(), "invariant");
   if (0 == requested) {
     // indicates a lease is being returned
     release(old, thread);
     return NULL;
   }
   // migration of in-flight information
   BufferPtr const new_buffer = lease_buffer(thread, used + requested);
   if (new_buffer != NULL) {
     migrate_outstanding_writes(old, new_buffer, used, requested);
   }
   release(old, thread);
   return new_buffer; // might be NULL
 }
 // offsets into the JfrCheckpointEntry
 static const juint starttime_offset = sizeof(jlong);
 static const juint duration_offset = starttime_offset + sizeof(jlong);
 static const juint flushpoint_offset = duration_offset + sizeof(jlong);
 static const juint types_offset = flushpoint_offset + sizeof(juint);
 static const juint payload_offset = types_offset + sizeof(juint);
 template <typename Return>
 static Return read_data(const u1* data) {
   return JfrBigEndian::read<Return>(data);
 }
 static jlong total_size(const u1* data) {
   return read_data<jlong>(data);
 }
 static jlong starttime(const u1* data) {
   return read_data<jlong>(data + starttime_offset);
 }
 static jlong duration(const u1* data) {
   return read_data<jlong>(data + duration_offset);
 }
 static bool is_flushpoint(const u1* data) {
   return read_data<juint>(data + flushpoint_offset) == (juint)1;
 }
 static juint number_of_types(const u1* data) {
   return read_data<juint>(data + types_offset);
 }
 static void write_checkpoint_header(JfrChunkWriter& cw, intptr_t offset_prev_cp_event, const u1* data) {
   cw.reserve(sizeof(u4));
   cw.write((u8)EVENT_CHECKPOINT);
   cw.write(starttime(data));
   cw.write(duration(data));
   cw.write((jlong)offset_prev_cp_event);
   cw.write(is_flushpoint(data));
   cw.write(number_of_types(data));
 }
 static void write_checkpoint_content(JfrChunkWriter& cw, const u1* data, size_t size) {
   assert(data != NULL, "invariant");
   cw.write_unbuffered(data + payload_offset, size);
 }
 static size_t write_checkpoint_event(JfrChunkWriter& cw, const u1* data) {
   assert(data != NULL, "invariant");
   const intptr_t previous_checkpoint_event = cw.previous_checkpoint_offset();
   const intptr_t event_begin = cw.current_offset();
   const intptr_t offset_to_previous_checkpoint_event = 0 == previous_checkpoint_event ? 0 : previous_checkpoint_event - event_begin;
   const jlong total_checkpoint_size = total_size(data);
   write_checkpoint_header(cw, offset_to_previous_checkpoint_event, data);
   write_checkpoint_content(cw, data, total_checkpoint_size - sizeof(JfrCheckpointEntry));
   const jlong checkpoint_event_size = cw.current_offset() - event_begin;
   cw.write_padded_at_offset<u4>(checkpoint_event_size, event_begin);
   cw.set_previous_checkpoint_offset(event_begin);
   return (size_t)total_checkpoint_size;
 }
 static size_t write_checkpoints(JfrChunkWriter& cw, const u1* data, size_t size) {
   assert(cw.is_valid(), "invariant");
   assert(data != NULL, "invariant");
   assert(size > 0, "invariant");
   const u1* const limit = data + size;
   const u1* next_entry = data;
   size_t processed = 0;
   while (next_entry < limit) {
     const size_t checkpoint_size = write_checkpoint_event(cw, next_entry);
     processed += checkpoint_size;
     next_entry += checkpoint_size;
   }
   assert(next_entry == limit, "invariant");
   return processed;
 }
 template <typename T>
 class CheckpointWriteOp {
  private:
   JfrChunkWriter& _writer;
   size_t _processed;
  public:
   typedef T Type;
   CheckpointWriteOp(JfrChunkWriter& writer) : _writer(writer), _processed(0) {}
   bool write(Type* t, const u1* data, size_t size) {
     _processed += write_checkpoints(_writer, data, size);
     return true;
   }
   size_t processed() const { return _processed; }
 };
 typedef CheckpointWriteOp<JfrCheckpointMspace::Type> WriteOperation;
 typedef MutexedWriteOp<WriteOperation> MutexedWriteOperation;
 typedef ReleaseOp<JfrCheckpointMspace> CheckpointReleaseOperation;
 typedef CompositeOperation<MutexedWriteOperation, CheckpointReleaseOperation> CheckpointWriteOperation;
 static size_t write_mspace_exclusive(JfrCheckpointMspace* mspace, JfrChunkWriter& chunkwriter) {
   Thread* const thread = Thread::current();
   WriteOperation wo(chunkwriter);
   MutexedWriteOperation mwo(wo);
   CheckpointReleaseOperation cro(mspace, thread, false);
   CheckpointWriteOperation cpwo(&mwo, &cro);
   assert(mspace->is_full_empty(), "invariant");
   process_free_list(cpwo, mspace);
   return wo.processed();
 }
 size_t JfrCheckpointManager::write() {
   const size_t processed = write_mspace_exclusive(_free_list_mspace, _chunkwriter);
   synchronize_epoch();
   return processed;
 }
 size_t JfrCheckpointManager::write_epoch_transition_mspace() {
   return write_mspace_exclusive(_epoch_transition_mspace, _chunkwriter);
 }
 typedef DiscardOp<DefaultDiscarder<JfrBuffer> > DiscardOperation;
 size_t JfrCheckpointManager::clear() {
   DiscardOperation discarder(mutexed); // mutexed discard mode
   process_free_list(discarder, _free_list_mspace);
   process_free_list(discarder, _epoch_transition_mspace);
   synchronize_epoch();
   return discarder.processed();
 }
 size_t JfrCheckpointManager::write_types() {
   JfrCheckpointWriter writer(false, true, Thread::current());
   JfrTypeManager::write_types(writer);
   return writer.used_size();
 }
 size_t JfrCheckpointManager::write_safepoint_types() {
   // this is also a "flushpoint"
   JfrCheckpointWriter writer(true, true, Thread::current());
   JfrTypeManager::write_safepoint_types(writer);
   return writer.used_size();
 }
 void JfrCheckpointManager::write_type_set() {
   JfrTypeManager::write_type_set();
 }
 void JfrCheckpointManager::write_type_set_for_unloaded_classes() {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
   JfrTypeManager::write_type_set_for_unloaded_classes();
 }
 void JfrCheckpointManager::create_thread_checkpoint(JavaThread* jt) {
   JfrTypeManager::create_thread_checkpoint(jt);
 }
 void JfrCheckpointManager::write_thread_checkpoint(JavaThread* jt) {
   JfrTypeManager::write_thread_checkpoint(jt);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/jfr/recorder/checkpoint/jfrCheckpointManager.cpp@d2c2cd90513e (annotated)

src/share/vm/jfr/recorder/checkpoint/jfrCheckpointManager.cpp