| /* |
| * Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_SHARED_PARALLELCLEANING_HPP |
| #define SHARE_VM_GC_SHARED_PARALLELCLEANING_HPP |
| |
| #include "gc/shared/oopStorageParState.hpp" |
| #include "gc/shared/workgroup.hpp" |
| #include "gc/shenandoah/shenandoahPhaseTimings.hpp" |
| |
| class StringSymbolTableUnlinkTask : public AbstractGangTask { |
| private: |
| BoolObjectClosure* _is_alive; |
| OopStorage::ParState<false /* concurrent */, false /* const */> _par_state_string; |
| int _initial_string_table_size; |
| int _initial_symbol_table_size; |
| |
| bool _process_strings; |
| volatile int _strings_processed; |
| volatile int _strings_removed; |
| |
| bool _process_symbols; |
| volatile int _symbols_processed; |
| volatile int _symbols_removed; |
| |
| public: |
| StringSymbolTableUnlinkTask(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols); |
| ~StringSymbolTableUnlinkTask(); |
| |
| void work(uint worker_id); |
| |
| size_t strings_processed() const; |
| size_t strings_removed() const; |
| |
| size_t symbols_processed() const; |
| size_t symbols_removed() const; |
| }; |
| |
| class CodeCacheUnloadingTask { |
| private: |
| static Monitor* _lock; |
| |
| BoolObjectClosure* const _is_alive; |
| const bool _unloading_occurred; |
| const uint _num_workers; |
| |
| // Variables used to claim nmethods. |
| CompiledMethod* _first_nmethod; |
| volatile CompiledMethod* _claimed_nmethod; |
| |
| // The list of nmethods that need to be processed by the second pass. |
| volatile CompiledMethod* _postponed_list; |
| volatile uint _num_entered_barrier; |
| |
| public: |
| CodeCacheUnloadingTask(uint num_workers, BoolObjectClosure* is_alive, bool unloading_occurred); |
| ~CodeCacheUnloadingTask(); |
| |
| private: |
| void add_to_postponed_list(CompiledMethod* nm); |
| |
| void clean_nmethod(CompiledMethod* nm); |
| |
| void clean_nmethod_postponed(CompiledMethod* nm); |
| |
| static const int MaxClaimNmethods = 16; |
| |
| void claim_nmethods(CompiledMethod** claimed_nmethods, int *num_claimed_nmethods); |
| |
| CompiledMethod* claim_postponed_nmethod(); |
| |
| public: |
| // Mark that we're done with the first pass of nmethod cleaning. |
| void barrier_mark(uint worker_id); |
| |
| // See if we have to wait for the other workers to |
| // finish their first-pass nmethod cleaning work. |
| void barrier_wait(uint worker_id); |
| |
| // Cleaning and unloading of nmethods. Some work has to be postponed |
| // to the second pass, when we know which nmethods survive. |
| void work_first_pass(uint worker_id); |
| |
| void work_second_pass(uint worker_id); |
| }; |
| |
| class KlassCleaningTask : public StackObj { |
| BoolObjectClosure* _is_alive; |
| volatile int _clean_klass_tree_claimed; |
| ClassLoaderDataGraphKlassIteratorAtomic _klass_iterator; |
| |
| public: |
| KlassCleaningTask(BoolObjectClosure* is_alive); |
| |
| private: |
| bool claim_clean_klass_tree_task(); |
| |
| InstanceKlass* claim_next_klass(); |
| |
| public: |
| |
| void clean_klass(InstanceKlass* ik); |
| |
| void work(); |
| }; |
| |
| class ResolvedMethodCleaningTask : public StackObj { |
| BoolObjectClosure* _is_alive; |
| volatile int _resolved_method_task_claimed; |
| public: |
| ResolvedMethodCleaningTask(BoolObjectClosure* is_alive) : |
| _is_alive(is_alive), _resolved_method_task_claimed(0) {} |
| |
| bool claim_resolved_method_task(); |
| void work(); |
| }; |
| |
| // To minimize the remark pause times, the tasks below are done in parallel. |
| class ParallelCleaningTask : public AbstractGangTask { |
| private: |
| StringSymbolTableUnlinkTask _string_symbol_task; |
| CodeCacheUnloadingTask _code_cache_task; |
| KlassCleaningTask _klass_cleaning_task; |
| ResolvedMethodCleaningTask _resolved_method_cleaning_task; |
| ShenandoahPhaseTimings::Phase _phase; |
| |
| public: |
| // The constructor is run in the VMThread. |
| ParallelCleaningTask(ShenandoahPhaseTimings::Phase phase, BoolObjectClosure* is_alive, bool process_strings, |
| bool process_symbols, uint num_workers, bool unloading_occurred); |
| |
| // The parallel work done by all worker threads. |
| void work(uint worker_id); |
| }; |
| |
| #endif // SHARE_VM_GC_SHARED_PARALLELCLEANING_HPP |