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/gcLogPrecious.hpp" 26 #include "gc/shared/workgroup.hpp" 27 #include "gc/z/zRuntimeWorkers.hpp" 28 #include "gc/z/zThread.hpp" 29 #include "runtime/mutexLocker.hpp" 30 31 class ZRuntimeWorkersInitializeTask : public AbstractGangTask { 32 private: 33 const uint _nworkers; 34 uint _started; 35 Monitor _monitor; 36 37 public: 38 ZRuntimeWorkersInitializeTask(uint nworkers) : 39 AbstractGangTask("ZRuntimeWorkersInitializeTask"), 40 _nworkers(nworkers), 41 _started(0), 42 _monitor(Monitor::leaf, 43 "ZRuntimeWorkersInitialize", 44 false /* allow_vm_block */, 45 Monitor::_safepoint_check_never) {} 46 47 virtual void work(uint worker_id) { 48 // Register as runtime worker 49 ZThread::set_runtime_worker(); 50 51 // Wait for all threads to start 52 MonitorLocker ml(&_monitor, Monitor::_no_safepoint_check_flag); 53 if (++_started == _nworkers) { 54 // All threads started 55 ml.notify_all(); 56 } else { 57 while (_started != _nworkers) { 58 ml.wait(); 59 } 60 } 61 } 62 }; 63 64 ZRuntimeWorkers::ZRuntimeWorkers() : 65 _workers("RuntimeWorker", 66 nworkers(), 67 false /* are_GC_task_threads */, 68 false /* are_ConcurrentGC_threads */) { 69 70 log_info_p(gc, init)("Runtime Workers: %u parallel", nworkers()); 71 72 // Initialize worker threads 73 _workers.initialize_workers(); 74 _workers.update_active_workers(nworkers()); 75 if (_workers.active_workers() != nworkers()) { 76 vm_exit_during_initialization("Failed to create ZRuntimeWorkers"); 77 } 78 79 // Execute task to register threads as runtime workers. This also 80 // helps reduce latency in early safepoints, which otherwise would 81 // have to take on any warmup costs. 82 ZRuntimeWorkersInitializeTask task(nworkers()); 83 _workers.run_task(&task); 84 } 85 86 uint ZRuntimeWorkers::nworkers() const { 87 return ParallelGCThreads; 88 } 89 90 WorkGang* ZRuntimeWorkers::workers() { 91 return &_workers; 92 } 93 94 void ZRuntimeWorkers::threads_do(ThreadClosure* tc) const { 95 _workers.threads_do(tc); 96 } 97 98 void ZRuntimeWorkers::print_threads_on(outputStream* st) const { 99 _workers.print_worker_threads_on(st); 100 }