src/hotspot/share/gc/shared/parallelCleaning.cpp
author kvn
Wed, 01 May 2019 12:31:29 -0700
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child 57510 4db4d0d14390
permissions -rw-r--r--
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library Reviewed-by: dnsimon, never, stefank, rehn, neliasso, dholmes, kbarrett, coleenp
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/*
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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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#if INCLUDE_JVMCI
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#include "jvmci/jvmci.hpp"
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#endif
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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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#if INCLUDE_JVMCI
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JVMCICleaningTask::JVMCICleaningTask() :
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  _cleaning_claimed(0) {
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}
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bool JVMCICleaningTask::claim_cleaning_task() {
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  if (_cleaning_claimed) {
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    return false;
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  }
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  return Atomic::cmpxchg(1, &_cleaning_claimed, 0) == 0;
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}
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void JVMCICleaningTask::work(bool unloading_occurred) {
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  // One worker will clean JVMCI metadata handles.
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  if (unloading_occurred && EnableJVMCI && claim_cleaning_task()) {
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    JVMCI::do_unloading(unloading_occurred);
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  }
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}
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#endif // INCLUDE_JVMCI
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ParallelCleaningTask::ParallelCleaningTask(BoolObjectClosure* is_alive,
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                                           uint num_workers,
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                                           bool unloading_occurred,
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                                           bool resize_dedup_table) :
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  AbstractGangTask("Parallel Cleaning"),
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  _unloading_occurred(unloading_occurred),
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  _string_dedup_task(is_alive, NULL, resize_dedup_table),
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  _code_cache_task(num_workers, is_alive, unloading_occurred),
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  JVMCI_ONLY(_jvmci_cleaning_task() COMMA)
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  _klass_cleaning_task() {
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}
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// The parallel work done by all worker threads.
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void ParallelCleaningTask::work(uint worker_id) {
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  // Clean JVMCI metadata handles.
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  // Execute this task first because it is serial task.
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  JVMCI_ONLY(_jvmci_cleaning_task.work(_unloading_occurred);)
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  // Do first pass of code cache cleaning.
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  _code_cache_task.work(worker_id);
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  // Clean the string dedup data structures.
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  _string_dedup_task.work(worker_id);
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  // Clean all klasses that were not unloaded.
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  // The weak metadata in klass doesn't need to be
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  // processed if there was no unloading.
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  if (_unloading_occurred) {
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    _klass_cleaning_task.work();
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  }
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}