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

src/share/vm/jfr/recorder/storage/jfrStorage.cpp@d2c2cd90513e (annotated)

src/share/vm/jfr/recorder/storage/jfrStorage.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) 2012, 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/jfrEvents.hpp"
 #include "jfr/jni/jfrJavaSupport.hpp"
 #include "jfr/recorder/jfrRecorder.hpp"
 #include "jfr/recorder/repository/jfrChunkWriter.hpp"
 #include "jfr/recorder/service/jfrOptionSet.hpp"
 #include "jfr/recorder/service/jfrPostBox.hpp"
 #include "jfr/recorder/storage/jfrMemorySpace.inline.hpp"
 #include "jfr/recorder/storage/jfrStorage.hpp"
 #include "jfr/recorder/storage/jfrStorageControl.hpp"
 #include "jfr/recorder/storage/jfrStorageUtils.inline.hpp"
 #include "jfr/utilities/jfrIterator.hpp"
 #include "jfr/utilities/jfrTime.hpp"
 #include "jfr/writers/jfrNativeEventWriter.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/orderAccess.hpp"
 #include "runtime/os.hpp"
 #include "runtime/safepoint.hpp"
 #include "runtime/thread.hpp"
 typedef JfrStorage::Buffer* BufferPtr;
 static JfrStorage* _instance = NULL;
 static JfrStorageControl* _control;
 JfrStorage& JfrStorage::instance() {
   return *_instance;
 }
 JfrStorage* JfrStorage::create(JfrChunkWriter& chunkwriter, JfrPostBox& post_box) {
   assert(_instance == NULL, "invariant");
   _instance = new JfrStorage(chunkwriter, post_box);
   return _instance;
 }
 void JfrStorage::destroy() {
   if (_instance != NULL) {
     delete _instance;
     _instance = NULL;
   }
 }
 JfrStorage::JfrStorage(JfrChunkWriter& chunkwriter, JfrPostBox& post_box) :
   _control(NULL),
   _global_mspace(NULL),
   _thread_local_mspace(NULL),
   _transient_mspace(NULL),
   _age_mspace(NULL),
   _chunkwriter(chunkwriter),
   _post_box(post_box) {}
 JfrStorage::~JfrStorage() {
   if (_control != NULL) {
     delete _control;
   }
   if (_global_mspace != NULL) {
     delete _global_mspace;
   }
   if (_thread_local_mspace != NULL) {
     delete _thread_local_mspace;
   }
   if (_transient_mspace != NULL) {
     delete _transient_mspace;
   }
   if (_age_mspace != NULL) {
     delete _age_mspace;
   }
   _instance = NULL;
 }
 static const size_t in_memory_discard_threshold_delta = 2; // start to discard data when the only this number of free buffers are left
 static const size_t unlimited_mspace_size = 0;
 static const size_t thread_local_cache_count = 8;
 static const size_t thread_local_scavenge_threshold = thread_local_cache_count / 2;
 static const size_t transient_buffer_size_multiplier = 8; // against thread local buffer size
 template <typename Mspace>
 static Mspace* create_mspace(size_t buffer_size, size_t limit, size_t cache_count, JfrStorage* storage_instance) {
   Mspace* mspace = new Mspace(buffer_size, limit, cache_count, storage_instance);
   if (mspace != NULL) {
     mspace->initialize();
   }
   return mspace;
 }
 bool JfrStorage::initialize() {
   assert(_control == NULL, "invariant");
   assert(_global_mspace == NULL, "invariant");
   assert(_thread_local_mspace == NULL, "invariant");
   assert(_transient_mspace == NULL, "invariant");
   assert(_age_mspace == NULL, "invariant");
   const size_t num_global_buffers = (size_t)JfrOptionSet::num_global_buffers();
   assert(num_global_buffers >= in_memory_discard_threshold_delta, "invariant");
   const size_t memory_size = (size_t)JfrOptionSet::memory_size();
   const size_t global_buffer_size = (size_t)JfrOptionSet::global_buffer_size();
   const size_t thread_buffer_size = (size_t)JfrOptionSet::thread_buffer_size();
   _control = new JfrStorageControl(num_global_buffers, num_global_buffers - in_memory_discard_threshold_delta);
   if (_control == NULL) {
     return false;
   }
   _global_mspace = create_mspace<JfrStorageMspace>(global_buffer_size, memory_size, num_global_buffers, this);
   if (_global_mspace == NULL) {
     return false;
   }
   _thread_local_mspace = create_mspace<JfrThreadLocalMspace>(thread_buffer_size, unlimited_mspace_size, thread_local_cache_count, this);
   if (_thread_local_mspace == NULL) {
     return false;
   }
   _transient_mspace = create_mspace<JfrStorageMspace>(thread_buffer_size * transient_buffer_size_multiplier, unlimited_mspace_size, 0, this);
   if (_transient_mspace == NULL) {
     return false;
   }
   _age_mspace = create_mspace<JfrStorageAgeMspace>(0 /* no extra size except header */, unlimited_mspace_size, num_global_buffers, this);
   if (_age_mspace == NULL) {
     return false;
   }
   control().set_scavenge_threshold(thread_local_scavenge_threshold);
   return true;
 }
 JfrStorageControl& JfrStorage::control() {
   return *instance()._control;
 }
 static void log_allocation_failure(const char* msg, size_t size) {
   if (LogJFR) tty->print_cr("Unable to allocate " SIZE_FORMAT " bytes of %s.", size, msg);
 }
 BufferPtr JfrStorage::acquire_thread_local(Thread* thread, size_t size /* 0 */) {
   BufferPtr buffer = mspace_get_to_full(size, instance()._thread_local_mspace, thread);
   if (buffer == NULL) {
     log_allocation_failure("thread local_memory", size);
     return NULL;
   }
   assert(buffer->acquired_by_self(), "invariant");
   return buffer;
 }
 BufferPtr JfrStorage::acquire_transient(size_t size, Thread* thread) {
   BufferPtr buffer = mspace_allocate_transient_lease_to_full(size, instance()._transient_mspace, thread);
   if (buffer == NULL) {
     log_allocation_failure("transient memory", size);
     return NULL;
   }
   assert(buffer->acquired_by_self(), "invariant");
   assert(buffer->transient(), "invariant");
   assert(buffer->lease(), "invariant");
   return buffer;
 }
 static BufferPtr get_lease(size_t size, JfrStorageMspace* mspace, JfrStorage& storage_instance, size_t retry_count, Thread* thread) {
   assert(size <= mspace->min_elem_size(), "invariant");
   while (true) {
     BufferPtr t = mspace_get_free_lease_with_retry(size, mspace, retry_count, thread);
     if (t == NULL && storage_instance.control().should_discard()) {
       storage_instance.discard_oldest(thread);
       continue;
     }
     return t;
   }
 }
 static BufferPtr get_promotion_buffer(size_t size, JfrStorageMspace* mspace, JfrStorage& storage_instance, size_t retry_count, Thread* thread) {
   assert(size <= mspace->min_elem_size(), "invariant");
   while (true) {
     BufferPtr t = mspace_get_free_with_retry(size, mspace, retry_count, thread);
     if (t == NULL && storage_instance.control().should_discard()) {
       storage_instance.discard_oldest(thread);
       continue;
     }
     return t;
   }
 }
 static const size_t lease_retry = 10;
 BufferPtr JfrStorage::acquire_large(size_t size, Thread* thread) {
   JfrStorage& storage_instance = instance();
   const size_t max_elem_size = storage_instance._global_mspace->min_elem_size(); // min is also max
   // if not too large and capacity is still available, ask for a lease from the global system
   if (size < max_elem_size && storage_instance.control().is_global_lease_allowed()) {
     BufferPtr const buffer = get_lease(size, storage_instance._global_mspace, storage_instance, lease_retry, thread);
     if (buffer != NULL) {
       assert(buffer->acquired_by_self(), "invariant");
       assert(!buffer->transient(), "invariant");
       assert(buffer->lease(), "invariant");
       storage_instance.control().increment_leased();
       return buffer;
     }
   }
   return acquire_transient(size, thread);
 }
 static void write_data_loss_event(JfrBuffer* buffer, u8 unflushed_size, Thread* thread) {
   assert(buffer != NULL, "invariant");
   assert(buffer->empty(), "invariant");
   const u8 total_data_loss = thread->jfr_thread_local()->add_data_lost(unflushed_size);
   if (EventDataLoss::is_enabled()) {
     JfrNativeEventWriter writer(buffer, thread);
     writer.write<u8>(EventDataLoss::eventId);
     writer.write(JfrTicks::now());
     writer.write(unflushed_size);
     writer.write(total_data_loss);
   }
 }
 static void write_data_loss(BufferPtr buffer, Thread* thread) {
   assert(buffer != NULL, "invariant");
   const size_t unflushed_size = buffer->unflushed_size();
   buffer->concurrent_reinitialization();
   if (unflushed_size == 0) {
     return;
   }
   write_data_loss_event(buffer, unflushed_size, thread);
 }
 static const size_t promotion_retry = 100;
 bool JfrStorage::flush_regular_buffer(BufferPtr buffer, Thread* thread) {
   assert(buffer != NULL, "invariant");
   assert(!buffer->lease(), "invariant");
   assert(!buffer->transient(), "invariant");
   const size_t unflushed_size = buffer->unflushed_size();
   if (unflushed_size == 0) {
     buffer->concurrent_reinitialization();
     assert(buffer->empty(), "invariant");
     return true;
   }
   BufferPtr const promotion_buffer = get_promotion_buffer(unflushed_size, _global_mspace, *this, promotion_retry, thread);
   if (promotion_buffer == NULL) {
     write_data_loss(buffer, thread);
     return false;
   }
   if (!JfrRecorder::is_shutting_down()) {
       assert(promotion_buffer->acquired_by_self(), "invariant");
   }
   assert(promotion_buffer->free_size() >= unflushed_size, "invariant");
   buffer->concurrent_move_and_reinitialize(promotion_buffer, unflushed_size);
   assert(buffer->empty(), "invariant");
   return true;
 }
 /*
 * 1. If the buffer was a "lease" from the global system, release back.
 * 2. If the buffer is transient (temporal dynamically allocated), retire and register full.
 *
 * The buffer is effectively invalidated for the thread post-return,
 * and the caller should take means to ensure that it is not referenced any longer.
 */
 void JfrStorage::release_large(BufferPtr buffer, Thread* thread) {
   assert(buffer != NULL, "invariant");
   assert(buffer->lease(), "invariant");
   assert(buffer->acquired_by_self(), "invariant");
   buffer->clear_lease();
   if (buffer->transient()) {
     buffer->set_retired();
     register_full(buffer, thread);
   } else {
     buffer->release();
     control().decrement_leased();
   }
 }
 static JfrAgeNode* new_age_node(BufferPtr buffer, JfrStorageAgeMspace* age_mspace, Thread* thread) {
   assert(buffer != NULL, "invariant");
   assert(age_mspace != NULL, "invariant");
   return mspace_allocate_transient(0, age_mspace, thread);
 }
 static void log_registration_failure(size_t unflushed_size) {
   if (LogJFR) tty->print_cr("Unable to register a full buffer of " SIZE_FORMAT " bytes.", unflushed_size);
   if (LogJFR) tty->print_cr("Cleared 1 full buffer of " SIZE_FORMAT " bytes.", unflushed_size);
 }
 static void handle_registration_failure(BufferPtr buffer) {
   assert(buffer != NULL, "invariant");
   assert(buffer->retired(), "invariant");
   const size_t unflushed_size = buffer->unflushed_size();
   buffer->reinitialize();
   log_registration_failure(unflushed_size);
 }
 static JfrAgeNode* get_free_age_node(JfrStorageAgeMspace* age_mspace, Thread* thread) {
   assert(JfrBuffer_lock->owned_by_self(), "invariant");
   return mspace_get_free_with_detach(0, age_mspace, thread);
 }
 static bool insert_full_age_node(JfrAgeNode* age_node, JfrStorageAgeMspace* age_mspace, Thread* thread) {
   assert(JfrBuffer_lock->owned_by_self(), "invariant");
   assert(age_node->retired_buffer()->retired(), "invariant");
   age_mspace->insert_full_head(age_node);
   return true;
 }
 static bool full_buffer_registration(BufferPtr buffer, JfrStorageAgeMspace* age_mspace, JfrStorageControl& control, Thread* thread) {
   assert(buffer != NULL, "invariant");
   assert(buffer->retired(), "invariant");
   assert(age_mspace != NULL, "invariant");
   MutexLockerEx lock(JfrBuffer_lock, Mutex::_no_safepoint_check_flag);
   JfrAgeNode* age_node = get_free_age_node(age_mspace, thread);
   if (age_node == NULL) {
     age_node = new_age_node(buffer, age_mspace, thread);
     if (age_node == NULL) {
       return false;
     }
   }
   assert(age_node->acquired_by_self(), "invariant");
   assert(age_node != NULL, "invariant");
   age_node->set_retired_buffer(buffer);
   control.increment_full();
   return insert_full_age_node(age_node, age_mspace, thread);
 }
 void JfrStorage::register_full(BufferPtr buffer, Thread* thread) {
   assert(buffer != NULL, "invariant");
   assert(buffer->retired(), "invariant");
   assert(buffer->acquired_by(thread), "invariant");
   if (!full_buffer_registration(buffer, _age_mspace, control(), thread)) {
     handle_registration_failure(buffer);
   }
   if (control().should_post_buffer_full_message()) {
     _post_box.post(MSG_FULLBUFFER);
   }
 }
 void JfrStorage::lock() {
   assert(!JfrBuffer_lock->owned_by_self(), "invariant");
   JfrBuffer_lock->lock_without_safepoint_check();
 }
 void JfrStorage::unlock() {
   assert(JfrBuffer_lock->owned_by_self(), "invariant");
   JfrBuffer_lock->unlock();
 }
 #ifdef ASSERT
 bool JfrStorage::is_locked() const {
   return JfrBuffer_lock->owned_by_self();
 }
 #endif
 // don't use buffer on return, it is gone
 void JfrStorage::release(BufferPtr buffer, Thread* thread) {
   assert(buffer != NULL, "invariant");
   assert(!buffer->lease(), "invariant");
   assert(!buffer->transient(), "invariant");
   assert(!buffer->retired(), "invariant");
   if (!buffer->empty()) {
     if (!flush_regular_buffer(buffer, thread)) {
       buffer->concurrent_reinitialization();
     }
   }
   assert(buffer->empty(), "invariant");
   assert(buffer->identity() != NULL, "invariant");
   control().increment_dead();
   buffer->set_retired();
 }
 void JfrStorage::release_thread_local(BufferPtr buffer, Thread* thread) {
   assert(buffer != NULL, "invariant");
   JfrStorage& storage_instance = instance();
   storage_instance.release(buffer, thread);
   if (storage_instance.control().should_scavenge()) {
     storage_instance._post_box.post(MSG_DEADBUFFER);
   }
 }
 static void log_discard(size_t count, size_t amount, size_t current) {
   assert(count > 0, "invariant");
   if (LogJFR) tty->print_cr("Cleared " SIZE_FORMAT " full buffer(s) of " SIZE_FORMAT" bytes.", count, amount);
   if (LogJFR) tty->print_cr("Current number of full buffers " SIZE_FORMAT "", current);
 }
 void JfrStorage::discard_oldest(Thread* thread) {
   if (JfrBuffer_lock->try_lock()) {
     if (!control().should_discard()) {
       // another thread handled it
       return;
     }
     const size_t num_full_pre_discard = control().full_count();
     size_t num_full_post_discard = 0;
     size_t discarded_size = 0;
     while (true) {
       JfrAgeNode* const oldest_age_node = _age_mspace->full_tail();
       if (oldest_age_node == NULL) {
         break;
       }
       BufferPtr const buffer = oldest_age_node->retired_buffer();
       assert(buffer->retired(), "invariant");
       discarded_size += buffer->unflushed_size();
       num_full_post_discard = control().decrement_full();
       if (buffer->transient()) {
         mspace_release_full(buffer, _transient_mspace);
         mspace_release_full(oldest_age_node, _age_mspace);
         continue;
       } else {
         mspace_release_full(oldest_age_node, _age_mspace);
         buffer->reinitialize();
         buffer->release(); // pusb
         break;
       }
     }
     JfrBuffer_lock->unlock();
     const size_t number_of_discards = num_full_pre_discard - num_full_post_discard;
     if (number_of_discards > 0) {
       log_discard(number_of_discards, discarded_size, num_full_post_discard);
     }
   }
 }
 #ifdef ASSERT
 typedef const BufferPtr ConstBufferPtr;
 static void assert_flush_precondition(ConstBufferPtr cur, size_t used, bool native, const Thread* t) {
   assert(t != NULL, "invariant");
   assert(cur != NULL, "invariant");
   assert(cur->pos() + used <= cur->end(), "invariant");
   assert(native ? t->jfr_thread_local()->native_buffer() == cur : t->jfr_thread_local()->java_buffer() == cur, "invariant");
 }
 static void assert_flush_regular_precondition(ConstBufferPtr cur, const u1* const cur_pos, size_t used, size_t req, const Thread* t) {
   assert(t != NULL, "invariant");
   assert(t->jfr_thread_local()->shelved_buffer() == NULL, "invariant");
   assert(cur != NULL, "invariant");
   assert(!cur->lease(), "invariant");
   assert(cur_pos != NULL, "invariant");
   assert(req >= used, "invariant");
 }
 static void assert_provision_large_precondition(ConstBufferPtr cur, size_t used, size_t req, const Thread* t) {
   assert(cur != NULL, "invariant");
   assert(t != NULL, "invariant");
   assert(t->jfr_thread_local()->shelved_buffer() != NULL, "invariant");
   assert(req >= used, "invariant");
 }
 static void assert_flush_large_precondition(ConstBufferPtr cur, const u1* const cur_pos, size_t used, size_t req, bool native, Thread* t) {
   assert(t != NULL, "invariant");
   assert(cur != NULL, "invariant");
   assert(cur->lease(), "invariant");
   assert(cur_pos != NULL, "invariant");
   assert(native ? t->jfr_thread_local()->native_buffer() == cur : t->jfr_thread_local()->java_buffer() == cur, "invariant");
   assert(t->jfr_thread_local()->shelved_buffer() != NULL, "invariant");
   assert(req >= used, "invariant");
   assert(cur != t->jfr_thread_local()->shelved_buffer(), "invariant");
 }
 #endif // ASSERT
 BufferPtr JfrStorage::flush(BufferPtr cur, size_t used, size_t req, bool native, Thread* t) {
   debug_only(assert_flush_precondition(cur, used, native, t);)
   const u1* const cur_pos = cur->pos();
   req += used;
   // requested size now encompass the outstanding used size
   return cur->lease() ? instance().flush_large(cur, cur_pos, used, req, native, t) :
                           instance().flush_regular(cur, cur_pos, used, req, native, t);
 }
 BufferPtr JfrStorage::flush_regular(BufferPtr cur, const u1* const cur_pos, size_t used, size_t req, bool native, Thread* t) {
   debug_only(assert_flush_regular_precondition(cur, cur_pos, used, req, t);)
   // A flush is needed before memcpy since a non-large buffer is thread stable
   // (thread local). The flush will not modify memory in addresses above pos()
   // which is where the "used / uncommitted" data resides. It is therefore both
   // possible and valid to migrate data after the flush. This is however only
   // the case for stable thread local buffers; it is not the case for large buffers.
   if (!cur->empty()) {
     flush_regular_buffer(cur, t);
   }
   assert(t->jfr_thread_local()->shelved_buffer() == NULL, "invariant");
   if (cur->free_size() >= req) {
     // simplest case, no switching of buffers
     if (used > 0) {
       memcpy(cur->pos(), (void*)cur_pos, used);
     }
     assert(native ? t->jfr_thread_local()->native_buffer() == cur : t->jfr_thread_local()->java_buffer() == cur, "invariant");
     return cur;
   }
   // Going for a "larger-than-regular" buffer.
   // Shelve the current buffer to make room for a temporary lease.
   t->jfr_thread_local()->shelve_buffer(cur);
   return provision_large(cur, cur_pos, used, req, native, t);
 }
 static BufferPtr store_buffer_to_thread_local(BufferPtr buffer, JfrThreadLocal* jfr_thread_local, bool native) {
   assert(buffer != NULL, "invariant");
   if (native) {
     jfr_thread_local->set_native_buffer(buffer);
   } else {
     jfr_thread_local->set_java_buffer(buffer);
   }
   return buffer;
 }
 static BufferPtr restore_shelved_buffer(bool native, Thread* t) {
   JfrThreadLocal* const tl = t->jfr_thread_local();
   BufferPtr shelved = tl->shelved_buffer();
   assert(shelved != NULL, "invariant");
   tl->shelve_buffer(NULL);
   // restore shelved buffer back as primary
   return store_buffer_to_thread_local(shelved, tl, native);
 }
 BufferPtr JfrStorage::flush_large(BufferPtr cur, const u1* const cur_pos, size_t used, size_t req, bool native, Thread* t) {
   debug_only(assert_flush_large_precondition(cur, cur_pos, used, req, native, t);)
   // Can the "regular" buffer (now shelved) accommodate the requested size?
   BufferPtr shelved = t->jfr_thread_local()->shelved_buffer();
   assert(shelved != NULL, "invariant");
   if (shelved->free_size() >= req) {
     if (req > 0) {
       memcpy(shelved->pos(), (void*)cur_pos, (size_t)used);
     }
     // release and invalidate
     release_large(cur, t);
     return restore_shelved_buffer(native, t);
   }
   // regular too small
   return provision_large(cur, cur_pos,  used, req, native, t);
 }
 static BufferPtr large_fail(BufferPtr cur, bool native, JfrStorage& storage_instance, Thread* t) {
   assert(cur != NULL, "invariant");
   assert(t != NULL, "invariant");
   if (cur->lease()) {
     storage_instance.release_large(cur, t);
   }
   return restore_shelved_buffer(native, t);
 }
 // Always returns a non-null buffer.
 // If accommodating the large request fails, the shelved buffer is returned
 // even though it might be smaller than the requested size.
 // Caller needs to ensure if the size was successfully accommodated.
 BufferPtr JfrStorage::provision_large(BufferPtr cur, const u1* const cur_pos, size_t used, size_t req, bool native, Thread* t) {
   debug_only(assert_provision_large_precondition(cur, used, req, t);)
   assert(t->jfr_thread_local()->shelved_buffer() != NULL, "invariant");
   BufferPtr const buffer = acquire_large(req, t);
   if (buffer == NULL) {
     // unable to allocate and serve the request
     return large_fail(cur, native, *this, t);
   }
   // ok managed to acquire a "large" buffer for the requested size
   assert(buffer->free_size() >= req, "invariant");
   assert(buffer->lease(), "invariant");
   // transfer outstanding data
   memcpy(buffer->pos(), (void*)cur_pos, used);
   if (cur->lease()) {
     release_large(cur, t);
     // don't use current anymore, it is gone
   }
   return store_buffer_to_thread_local(buffer, t->jfr_thread_local(), native);
 }
 typedef UnBufferedWriteToChunk<JfrBuffer> WriteOperation;
 typedef MutexedWriteOp<WriteOperation> MutexedWriteOperation;
 typedef ConcurrentWriteOp<WriteOperation> ConcurrentWriteOperation;
 typedef ConcurrentWriteOpExcludeRetired<WriteOperation> ThreadLocalConcurrentWriteOperation;
 size_t JfrStorage::write() {
   const size_t full_size_processed = write_full();
   WriteOperation wo(_chunkwriter);
   ThreadLocalConcurrentWriteOperation tlwo(wo);
   process_full_list(tlwo, _thread_local_mspace);
   ConcurrentWriteOperation cwo(wo);
   process_free_list(cwo, _global_mspace);
   return full_size_processed + wo.processed();
 }
 size_t JfrStorage::write_at_safepoint() {
   assert(SafepointSynchronize::is_at_safepoint(), "invariant");
   WriteOperation wo(_chunkwriter);
   MutexedWriteOperation writer(wo); // mutexed write mode
   process_full_list(writer, _thread_local_mspace);
   assert(_transient_mspace->is_free_empty(), "invariant");
   process_full_list(writer, _transient_mspace);
   assert(_global_mspace->is_full_empty(), "invariant");
   process_free_list(writer, _global_mspace);
   return wo.processed();
 }
 typedef DiscardOp<DefaultDiscarder<JfrStorage::Buffer> > DiscardOperation;
 typedef ReleaseOp<JfrStorageMspace> ReleaseOperation;
 typedef CompositeOperation<MutexedWriteOperation, ReleaseOperation> FullOperation;
 size_t JfrStorage::clear() {
   const size_t full_size_processed = clear_full();
   DiscardOperation discarder(concurrent); // concurrent discard mode
   process_full_list(discarder, _thread_local_mspace);
   assert(_transient_mspace->is_free_empty(), "invariant");
   process_full_list(discarder, _transient_mspace);
   assert(_global_mspace->is_full_empty(), "invariant");
   process_free_list(discarder, _global_mspace);
   return full_size_processed + discarder.processed();
 }
 static void insert_free_age_nodes(JfrStorageAgeMspace* age_mspace, JfrAgeNode* head, JfrAgeNode* tail, size_t count) {
   if (tail != NULL) {
     assert(tail->next() == NULL, "invariant");
     assert(head != NULL, "invariant");
     assert(head->prev() == NULL, "invariant");
     MutexLockerEx buffer_lock(JfrBuffer_lock, Mutex::_no_safepoint_check_flag);
     age_mspace->insert_free_tail(head, tail, count);
   }
 }
 template <typename Processor>
 static void process_age_list(Processor& processor, JfrStorageAgeMspace* age_mspace, JfrAgeNode* head, size_t count) {
   assert(age_mspace != NULL, "invariant");
   assert(head != NULL, "invariant");
   assert(count > 0, "invariant");
   JfrAgeNode* node = head;
   JfrAgeNode* last = NULL;
   while (node != NULL) {
     last = node;
     BufferPtr const buffer = node->retired_buffer();
     assert(buffer != NULL, "invariant");
     assert(buffer->retired(), "invariant");
     processor.process(buffer);
     // at this point, buffer is already live or destroyed
     node->clear_identity();
     JfrAgeNode* const next = (JfrAgeNode*)node->next();
     if (node->transient()) {
       // detach
       last = (JfrAgeNode*)last->prev();
       if (last != NULL) {
         last->set_next(next);
       } else {
         head = next;
       }
       if (next != NULL) {
         next->set_prev(last);
       }
       --count;
       age_mspace->deallocate(node);
     }
     node = next;
   }
   insert_free_age_nodes(age_mspace, head, last, count);
 }
 template <typename Processor>
 static size_t process_full(Processor& processor, JfrStorageControl& control, JfrStorageAgeMspace* age_mspace) {
   assert(age_mspace != NULL, "invariant");
   if (age_mspace->is_full_empty()) {
     // nothing to do
     return 0;
   }
   size_t count;
   JfrAgeNode* head;
   {
     // fetch age list
     MutexLockerEx buffer_lock(JfrBuffer_lock, Mutex::_no_safepoint_check_flag);
     count = age_mspace->full_count();
     head = age_mspace->clear_full();
     control.reset_full();
   }
   assert(head != NULL, "invariant");
   assert(count > 0, "invariant");
   process_age_list(processor, age_mspace, head, count);
   return count;
 }
 static void log(size_t count, size_t amount, bool clear = false) {
   if (count > 0) {
     if (LogJFR) tty->print_cr("%s " SIZE_FORMAT " full buffer(s) of " SIZE_FORMAT" B of data%s",
       clear ? "Discarded" : "Wrote", count, amount, clear ? "." : " to chunk.");
   }
 }
 // full writer
 // Assumption is retired only; exclusive access
 // MutexedWriter -> ReleaseOp
 //
 size_t JfrStorage::write_full() {
   assert(_chunkwriter.is_valid(), "invariant");
   Thread* const thread = Thread::current();
   WriteOperation wo(_chunkwriter);
   MutexedWriteOperation writer(wo); // a retired buffer implies mutexed access
   ReleaseOperation ro(_transient_mspace, thread);
   FullOperation cmd(&writer, &ro);
   const size_t count = process_full(cmd, control(), _age_mspace);
   log(count, writer.processed());
   return writer.processed();
 }
 size_t JfrStorage::clear_full() {
   DiscardOperation discarder(mutexed); // a retired buffer implies mutexed access
   const size_t count = process_full(discarder, control(), _age_mspace);
   log(count, discarder.processed(), true);
   return discarder.processed();
 }
 static void scavenge_log(size_t count, size_t amount, size_t current) {
   if (count > 0) {
     if (LogJFR) tty->print_cr("Released " SIZE_FORMAT " dead buffer(s) of " SIZE_FORMAT" B of data.", count, amount);
     if (LogJFR) tty->print_cr("Current number of dead buffers " SIZE_FORMAT "", current);
   }
 }
 template <typename Mspace>
 class Scavenger {
 private:
   JfrStorageControl& _control;
   Mspace* _mspace;
   size_t _count;
   size_t _amount;
 public:
   typedef typename Mspace::Type Type;
   Scavenger(JfrStorageControl& control, Mspace* mspace) : _control(control), _mspace(mspace), _count(0), _amount(0) {}
   bool process(Type* t) {
     if (t->retired()) {
       assert(t->identity() != NULL, "invariant");
       assert(t->empty(), "invariant");
       assert(!t->transient(), "invariant");
       assert(!t->lease(), "invariant");
       ++_count;
       _amount += t->total_size();
       t->clear_retired();
       t->release();
       _control.decrement_dead();
       mspace_release_full_critical(t, _mspace);
     }
     return true;
   }
   size_t processed() const { return _count; }
   size_t amount() const { return _amount; }
 };
 size_t JfrStorage::scavenge() {
   JfrStorageControl& ctrl = control();
   if (ctrl.dead_count() == 0) {
     return 0;
   }
   Scavenger<JfrThreadLocalMspace> scavenger(ctrl, _thread_local_mspace);
   process_full_list(scavenger, _thread_local_mspace);
   scavenge_log(scavenger.processed(), scavenger.amount(), ctrl.dead_count());
   return scavenger.processed();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/jfr/recorder/storage/jfrStorage.cpp@d2c2cd90513e (annotated)

src/share/vm/jfr/recorder/storage/jfrStorage.cpp