1 /* 2 * Copyright (c) 2016, 2019, 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 #ifndef SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP 26 #define SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP 27 28 #include "jfr/recorder/storage/jfrBuffer.hpp" 29 #include "jfr/recorder/storage/jfrMemorySpace.hpp" 30 #include "jfr/recorder/storage/jfrMemorySpaceRetrieval.hpp" 31 #include "tracefiles/traceTypes.hpp" 32 33 class JfrCheckpointManager; 34 class JfrChunkWriter; 35 class JfrConstantManager; 36 class JfrConstantSerializer; 37 class Mutex; 38 class Thread; 39 40 struct JfrCheckpointEntry { 41 jlong size; 42 jlong start_time; 43 jlong duration; 44 juint flushpoint; 45 juint nof_segments; 46 }; 47 48 typedef JfrMemorySpace<JfrBuffer, JfrMspaceSequentialRetrieval, JfrCheckpointManager> JfrCheckpointMspace; 49 50 // 51 // Responsible for maintaining checkpoints and by implication constants. 52 // A checkpoint is an event that has a payload consisting of constant types. 53 // A constant type is a relation, a set of key-value pairs. 54 // 55 class JfrCheckpointManager : public JfrCHeapObj { 56 public: 57 typedef JfrCheckpointMspace::Type Buffer; 58 typedef JfrCheckpointMspace::List List; 59 private: 60 List _epoch_transition_list; 61 JfrCheckpointMspace* _free_list_mspace; 62 JfrCheckpointMspace* _transient_mspace; 63 Mutex* _lock; 64 JfrConstantManager* _constant_manager; 65 const Thread* _service_thread; 66 JfrChunkWriter& _chunkwriter; 67 bool _checkpoint_epoch_state; 68 69 // mspace callback 70 void register_full(Buffer* t, Thread* thread); 71 void lock(); 72 void unlock(); 73 74 static Buffer* lease_buffer(Thread* t, size_t size = 0); 75 Buffer* lease_transient(size_t size, Thread* t); 76 static Buffer* flush(Buffer* old, size_t used, size_t requested, Thread* t); 77 78 size_t clear(); 79 size_t write(); 80 size_t write_epoch_transition_list(); 81 size_t write_constant_types(); 82 size_t write_safepoint_constant_types(); 83 void write_constant_tag_set(); 84 void shift_epoch(); 85 void synchronize_epoch(); 86 bool use_epoch_transition_list(const Thread* t) const; 87 88 JfrCheckpointManager(JfrChunkWriter& cw); 89 ~JfrCheckpointManager(); 90 91 static JfrCheckpointManager &instance(); 92 static JfrCheckpointManager* create(JfrChunkWriter& cw); 93 bool initialize(); 94 static void destroy(); 95 96 static bool register_serializer(JfrConstantTypeId id, bool require_safepoint, bool permit_cache, JfrConstantSerializer* serializer); 97 98 public: 99 void register_service_thread(const Thread* t); 100 static void write_constant_tag_set_for_unloaded_classes(); 101 static void create_thread_checkpoint(JavaThread* jt); 102 static void write_thread_checkpoint(JavaThread* jt); 103 104 friend class JfrRecorder; 105 friend class JfrRecorderService; 106 friend class JfrCheckpointFlush; 107 friend class JfrCheckpointWriter; 108 friend class JfrConstantSerializer; 109 friend class JfrStackTraceRepository; 110 template <typename, template <typename> class, typename> 111 friend class JfrMemorySpace; 112 }; 113 114 #endif //SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP