1 /* 2 * Copyright (c) 2012, 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_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP 26 #define SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP 27 28 #include "jfr/utilities/jfrAllocation.hpp" 29 #include "runtime/thread.hpp" 30 31 class Monitor; 32 class JfrStackFrame; 33 34 enum JfrSampleType { 35 NO_SAMPLE = 0, 36 JAVA_SAMPLE = 1, 37 NATIVE_SAMPLE = 2 38 }; 39 40 class JfrThreadSampler : public Thread { 41 friend class JfrThreadSampling; 42 private: 43 JfrStackFrame* const _frames; 44 JavaThread* _last_thread_java; 45 JavaThread* _last_thread_native; 46 size_t _interval_java; 47 size_t _interval_native; 48 int _cur_index; 49 const u4 _max_frames; 50 bool _should_terminate; 51 static Monitor* _transition_block_lock; 52 53 int find_index_of_JavaThread(JavaThread** t_list, uint length, JavaThread *target); 54 JavaThread* next_thread(JavaThread** t_list, uint length, JavaThread* first_sampled, JavaThread* current); 55 void task_stacktrace(JfrSampleType type, JavaThread** last_thread); 56 JfrThreadSampler(size_t interval_java, size_t interval_native, u4 max_frames); 57 ~JfrThreadSampler(); 58 void enroll(); 59 void disenroll(); 60 void set_java_interval(size_t interval) { _interval_java = interval; }; 61 void set_native_interval(size_t interval) { _interval_native = interval; }; 62 size_t get_java_interval() { return _interval_java; }; 63 size_t get_native_interval() { return _interval_native; }; 64 65 public: 66 void run(); 67 static Monitor* transition_block() { return _transition_block_lock; } 68 static void on_javathread_suspend(JavaThread* thread); 69 }; 70 71 class JfrThreadSampling : public JfrCHeapObj { 72 friend class JfrRecorder; 73 private: 74 JfrThreadSampler* _sampler; 75 void start_sampler(size_t interval_java, size_t interval_native); 76 void stop_sampler(); 77 void set_sampling_interval(bool java_interval, size_t period); 78 79 JfrThreadSampling(); 80 ~JfrThreadSampling(); 81 82 static JfrThreadSampling& instance(); 83 static JfrThreadSampling* create(); 84 static void destroy(); 85 86 public: 87 static void set_java_sample_interval(size_t period); 88 static void set_native_sample_interval(size_t period); 89 }; 90 91 #endif // SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP 92