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