1 /* 2 * Copyright (c) 2018, 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/shared/workgroup.hpp" 26 #include "gc/z/zRuntimeWorkers.hpp" 27 #include "gc/z/zThread.hpp" 28 #include "runtime/mutexLocker.hpp" 29 30 class ZRuntimeWorkersInitializeTask : public AbstractGangTask { 31 private: 32 const uint _nworkers; 33 uint _started; 34 Monitor _monitor; 35 36 public: 37 ZRuntimeWorkersInitializeTask(uint nworkers) : 38 AbstractGangTask("ZRuntimeWorkersInitializeTask"), 39 _nworkers(nworkers), 40 _started(0), 41 _monitor(Monitor::leaf, 42 "ZRuntimeWorkersInitialize", 43 false /* allow_vm_block */, 44 Monitor::_safepoint_check_never) {} 45 46 virtual void work(uint worker_id) { 47 // Register as runtime worker 48 ZThread::set_runtime_worker(); 49 50 // Wait for all threads to start 51 MonitorLocker ml(&_monitor, Monitor::_no_safepoint_check_flag); 52 if (++_started == _nworkers) { 53 // All threads started 54 ml.notify_all(); 55 } else { 56 while (_started != _nworkers) { 57 ml.wait(); 58 } 59 } 60 } 61 }; 62 63 ZRuntimeWorkers::ZRuntimeWorkers() : 64 _workers("RuntimeWorker", 65 nworkers(), 66 false /* are_GC_task_threads */, 67 false /* are_ConcurrentGC_threads */) { 68 69 log_info(gc, init)("Runtime Workers: %u parallel", nworkers()); 70 71 // Initialize worker threads 72 _workers.initialize_workers(); 73 _workers.update_active_workers(nworkers()); 74 if (_workers.active_workers() != nworkers()) { 75 vm_exit_during_initialization("Failed to create ZRuntimeWorkers"); 76 } 77 78 // Execute task to register threads as runtime workers. This also 79 // helps reduce latency in early safepoints, which otherwise would 80 // have to take on any warmup costs. 81 ZRuntimeWorkersInitializeTask task(nworkers()); 82 _workers.run_task(&task); 83 } 84 85 uint ZRuntimeWorkers::nworkers() const { 86 return ParallelGCThreads; 87 } 88 89 WorkGang* ZRuntimeWorkers::workers() { 90 return &_workers; 91 } 92 93 void ZRuntimeWorkers::threads_do(ThreadClosure* tc) const { 94 _workers.threads_do(tc); 95 } 96 97 void ZRuntimeWorkers::print_threads_on(outputStream* st) const { 98 _workers.print_worker_threads_on(st); 99 }