1 /* 2 * Copyright (c) 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 #include "precompiled.hpp" 26 27 #include "gc/g1/g1ParallelCleaning.hpp" 28 #include "runtime/atomic.hpp" 29 #if INCLUDE_JVMCI 30 #include "jvmci/jvmci.hpp" 31 #endif 32 33 #if INCLUDE_JVMCI 34 JVMCICleaningTask::JVMCICleaningTask() : 35 _cleaning_claimed(0) { 36 } 37 38 bool JVMCICleaningTask::claim_cleaning_task() { 39 if (_cleaning_claimed) { 40 return false; 41 } 42 43 return Atomic::cmpxchg(&_cleaning_claimed, 0, 1) == 0; 44 } 45 46 void JVMCICleaningTask::work(bool unloading_occurred) { 47 // One worker will clean JVMCI metadata handles. 48 if (unloading_occurred && EnableJVMCI && claim_cleaning_task()) { 49 JVMCI::do_unloading(unloading_occurred); 50 } 51 } 52 #endif // INCLUDE_JVMCI 53 54 G1ParallelCleaningTask::G1ParallelCleaningTask(BoolObjectClosure* is_alive, 55 uint num_workers, 56 bool unloading_occurred, 57 bool resize_dedup_table) : 58 AbstractGangTask("G1 Parallel Cleaning"), 59 _unloading_occurred(unloading_occurred), 60 _string_dedup_task(is_alive, NULL, resize_dedup_table), 61 _code_cache_task(num_workers, is_alive, unloading_occurred), 62 JVMCI_ONLY(_jvmci_cleaning_task() COMMA) 63 _klass_cleaning_task() { 64 } 65 66 // The parallel work done by all worker threads. 67 void G1ParallelCleaningTask::work(uint worker_id) { 68 // Clean JVMCI metadata handles. 69 // Execute this task first because it is serial task. 70 JVMCI_ONLY(_jvmci_cleaning_task.work(_unloading_occurred);) 71 72 // Do first pass of code cache cleaning. 73 _code_cache_task.work(worker_id); 74 75 // Clean the string dedup data structures. 76 _string_dedup_task.work(worker_id); 77 78 // Clean all klasses that were not unloaded. 79 // The weak metadata in klass doesn't need to be 80 // processed if there was no unloading. 81 if (_unloading_occurred) { 82 _klass_cleaning_task.work(); 83 } 84 }