160 lines
4.7 KiB
C++
160 lines
4.7 KiB
C++
/*
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/symbolTable.hpp"
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#include "classfile/stringTable.hpp"
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#include "code/codeCache.hpp"
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#include "gc/shared/parallelCleaning.hpp"
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#include "logging/log.hpp"
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#include "memory/resourceArea.hpp"
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#include "logging/log.hpp"
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StringDedupCleaningTask::StringDedupCleaningTask(BoolObjectClosure* is_alive,
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OopClosure* keep_alive,
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bool resize_table) :
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AbstractGangTask("String Dedup Cleaning"),
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_dedup_closure(is_alive, keep_alive) {
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if (StringDedup::is_enabled()) {
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StringDedup::gc_prologue(resize_table);
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}
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}
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StringDedupCleaningTask::~StringDedupCleaningTask() {
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if (StringDedup::is_enabled()) {
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StringDedup::gc_epilogue();
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}
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}
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void StringDedupCleaningTask::work(uint worker_id) {
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if (StringDedup::is_enabled()) {
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StringDedup::parallel_unlink(&_dedup_closure, worker_id);
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}
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}
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CodeCacheUnloadingTask::CodeCacheUnloadingTask(uint num_workers, BoolObjectClosure* is_alive, bool unloading_occurred) :
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_unloading_scope(is_alive),
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_unloading_occurred(unloading_occurred),
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_num_workers(num_workers),
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_first_nmethod(NULL),
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_claimed_nmethod(NULL) {
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// Get first alive nmethod
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CompiledMethodIterator iter(CompiledMethodIterator::only_alive);
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if(iter.next()) {
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_first_nmethod = iter.method();
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}
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_claimed_nmethod = _first_nmethod;
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}
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CodeCacheUnloadingTask::~CodeCacheUnloadingTask() {
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CodeCache::verify_clean_inline_caches();
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CodeCache::verify_icholder_relocations();
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}
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void CodeCacheUnloadingTask::claim_nmethods(CompiledMethod** claimed_nmethods, int *num_claimed_nmethods) {
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CompiledMethod* first;
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CompiledMethodIterator last(CompiledMethodIterator::only_alive);
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do {
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*num_claimed_nmethods = 0;
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first = _claimed_nmethod;
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last = CompiledMethodIterator(CompiledMethodIterator::only_alive, first);
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if (first != NULL) {
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for (int i = 0; i < MaxClaimNmethods; i++) {
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if (!last.next()) {
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break;
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}
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claimed_nmethods[i] = last.method();
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(*num_claimed_nmethods)++;
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}
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}
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} while (Atomic::cmpxchg(last.method(), &_claimed_nmethod, first) != first);
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}
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void CodeCacheUnloadingTask::work(uint worker_id) {
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// The first nmethods is claimed by the first worker.
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if (worker_id == 0 && _first_nmethod != NULL) {
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_first_nmethod->do_unloading(_unloading_occurred);
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_first_nmethod = NULL;
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}
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int num_claimed_nmethods;
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CompiledMethod* claimed_nmethods[MaxClaimNmethods];
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while (true) {
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claim_nmethods(claimed_nmethods, &num_claimed_nmethods);
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if (num_claimed_nmethods == 0) {
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break;
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}
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for (int i = 0; i < num_claimed_nmethods; i++) {
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claimed_nmethods[i]->do_unloading(_unloading_occurred);
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}
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}
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}
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KlassCleaningTask::KlassCleaningTask() :
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_clean_klass_tree_claimed(0),
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_klass_iterator() {
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}
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bool KlassCleaningTask::claim_clean_klass_tree_task() {
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if (_clean_klass_tree_claimed) {
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return false;
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}
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return Atomic::cmpxchg(1, &_clean_klass_tree_claimed, 0) == 0;
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}
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InstanceKlass* KlassCleaningTask::claim_next_klass() {
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Klass* klass;
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do {
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klass =_klass_iterator.next_klass();
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} while (klass != NULL && !klass->is_instance_klass());
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// this can be null so don't call InstanceKlass::cast
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return static_cast<InstanceKlass*>(klass);
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}
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void KlassCleaningTask::work() {
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ResourceMark rm;
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// One worker will clean the subklass/sibling klass tree.
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if (claim_clean_klass_tree_task()) {
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Klass::clean_subklass_tree();
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}
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// All workers will help cleaning the classes,
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InstanceKlass* klass;
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while ((klass = claim_next_klass()) != NULL) {
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clean_klass(klass);
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}
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}
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