1 /* 2 * Copyright (c) 2012, 2018, 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 #include "precompiled.hpp" 26 #include "jfr/recorder/jfrRecorder.hpp" 27 #include "jfr/recorder/service/jfrPostBox.hpp" 28 #include "jfr/recorder/service/jfrRecorderService.hpp" 29 #include "jfr/recorder/service/jfrRecorderThread.hpp" 30 #include "runtime/mutexLocker.hpp" 31 #include "runtime/thread.inline.hpp" 32 33 // 34 // Entry point for "JFR Recorder Thread" message loop. 35 // The recorder thread executes service requests collected from the message system. 36 // 37 void recorderthread_entry(JavaThread* thread, Thread* unused) { 38 assert(thread != NULL, "invariant"); 39 #define START (msgs & (MSGBIT(MSG_START))) 40 #define SHUTDOWN (msgs & MSGBIT(MSG_SHUTDOWN)) 41 #define ROTATE (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP))) 42 #define PROCESS_FULL_BUFFERS (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP)|MSGBIT(MSG_FULLBUFFER))) 43 #define SCAVENGE (msgs & (MSGBIT(MSG_DEADBUFFER))) 44 45 JfrPostBox& post_box = JfrRecorderThread::post_box(); 46 if (LogJFR) tty->print_cr("Recorder thread STARTED"); 47 48 { 49 bool done = false; 50 int msgs = 0; 51 JfrRecorderService service; 52 MutexLockerEx msg_lock(JfrMsg_lock); 53 54 // JFR MESSAGE LOOP PROCESSING - BEGIN 55 while (!done) { 56 if (post_box.is_empty()) { 57 JfrMsg_lock->wait(false); 58 } 59 msgs = post_box.collect(); 60 JfrMsg_lock->unlock(); 61 if (PROCESS_FULL_BUFFERS) { 62 service.process_full_buffers(); 63 } 64 if (SCAVENGE) { 65 service.scavenge(); 66 } 67 // Check amount of data written to chunk already 68 // if it warrants asking for a new chunk 69 service.evaluate_chunk_size_for_rotation(); 70 if (START) { 71 service.start(); 72 } else if (ROTATE) { 73 service.rotate(msgs); 74 } 75 JfrMsg_lock->lock(); 76 post_box.notify_waiters(); 77 if (SHUTDOWN) { 78 if (LogJFR) tty->print_cr("Request to STOP recorder"); 79 done = true; 80 } 81 } // JFR MESSAGE LOOP PROCESSING - END 82 83 } // JfrMsg_lock scope 84 85 assert(!JfrMsg_lock->owned_by_self(), "invariant"); 86 post_box.notify_collection_stop(); 87 JfrRecorder::on_recorder_thread_exit(); 88 89 #undef START 90 #undef SHUTDOWN 91 #undef ROTATE 92 #undef PROCESS_FULL_BUFFERS 93 #undef SCAVENGE 94 }