1 /* 2 * Copyright (c) 2015, 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 #include "precompiled.hpp" 25 #include "gc/z/zGlobals.hpp" 26 #include "gc/z/zTask.hpp" 27 #include "gc/z/zThread.hpp" 28 #include "gc/z/zWorkers.inline.hpp" 29 #include "runtime/mutexLocker.hpp" 30 #include "runtime/safepoint.hpp" 31 32 class ZWorkersInitializeTask : public ZTask { 33 private: 34 const uint _nworkers; 35 uint _started; 36 Monitor _monitor; 37 38 public: 39 ZWorkersInitializeTask(uint nworkers) : 40 ZTask("ZWorkersInitializeTask"), 41 _nworkers(nworkers), 42 _started(0), 43 _monitor(Monitor::leaf, 44 "ZWorkersInitialize", 45 false /* allow_vm_block */, 46 Monitor::_safepoint_check_never) {} 47 48 virtual void work() { 49 // Register as worker 50 ZThread::set_worker(); 51 52 // Wait for all threads to start 53 MonitorLocker ml(&_monitor, Monitor::_no_safepoint_check_flag); 54 if (++_started == _nworkers) { 55 // All threads started 56 ml.notify_all(); 57 } else { 58 while (_started != _nworkers) { 59 ml.wait(); 60 } 61 } 62 } 63 }; 64 65 ZWorkers::ZWorkers() : 66 _boost(false), 67 _workers("ZWorker", 68 nworkers(), 69 true /* are_GC_task_threads */, 70 true /* are_ConcurrentGC_threads */) { 71 72 log_info(gc, init)("Workers: %u parallel, %u concurrent", nparallel(), nconcurrent()); 73 74 // Initialize worker threads 75 _workers.initialize_workers(); 76 _workers.update_active_workers(nworkers()); 77 if (_workers.active_workers() != nworkers()) { 78 vm_exit_during_initialization("Failed to create ZWorkers"); 79 } 80 81 // Execute task to register threads as workers. This also helps 82 // reduce latency in early GC pauses, which otherwise would have 83 // to take on any warmup costs. 84 ZWorkersInitializeTask task(nworkers()); 85 run(&task, nworkers()); 86 } 87 88 void ZWorkers::set_boost(bool boost) { 89 if (boost) { 90 log_debug(gc)("Boosting workers"); 91 } 92 93 _boost = boost; 94 } 95 96 void ZWorkers::run(ZTask* task, uint nworkers) { 97 log_debug(gc, task)("Executing Task: %s, Active Workers: %u", task->name(), nworkers); 98 _workers.update_active_workers(nworkers); 99 _workers.run_task(task->gang_task()); 100 } 101 102 void ZWorkers::run_parallel(ZTask* task) { 103 run(task, nparallel()); 104 } 105 106 void ZWorkers::run_concurrent(ZTask* task) { 107 run(task, nconcurrent()); 108 } 109 110 void ZWorkers::threads_do(ThreadClosure* tc) const { 111 _workers.threads_do(tc); 112 } 113 114 void ZWorkers::print_threads_on(outputStream* st) const { 115 _workers.print_worker_threads_on(st); 116 }