src/hotspot/share/gc/shared/vmGCOperations.cpp
author stefank
Thu, 22 Feb 2018 18:36:32 +0100
changeset 49048 4e8c86b75428
parent 49047 8f004146e407
child 49449 ef5d5d343e2a
permissions -rw-r--r--
8198525: Move _size_policy out of GenCollectorPolicy into GenCollectedHeap Reviewed-by: pliden, sjohanss
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/*
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 * Copyright (c) 2005, 2017, 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/classLoader.hpp"
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#include "classfile/javaClasses.hpp"
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#include "gc/shared/allocTracer.hpp"
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#include "gc/shared/gcId.hpp"
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#include "gc/shared/gcLocker.inline.hpp"
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#include "gc/shared/genCollectedHeap.hpp"
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#include "gc/shared/vmGCOperations.hpp"
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#include "interpreter/oopMapCache.hpp"
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#include "logging/log.hpp"
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#include "memory/oopFactory.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/init.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "utilities/dtrace.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/preserveException.hpp"
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#if INCLUDE_ALL_GCS
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1Policy.hpp"
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#endif // INCLUDE_ALL_GCS
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VM_GC_Operation::~VM_GC_Operation() {
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  CollectedHeap* ch = Universe::heap();
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  ch->soft_ref_policy()->set_all_soft_refs_clear(false);
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}
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// The same dtrace probe can't be inserted in two different files, so we
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// have to call it here, so it's only in one file.  Can't create new probes
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// for the other file anymore.   The dtrace probes have to remain stable.
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void VM_GC_Operation::notify_gc_begin(bool full) {
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  HOTSPOT_GC_BEGIN(
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                   full);
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  HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
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}
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void VM_GC_Operation::notify_gc_end() {
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  HOTSPOT_GC_END();
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  HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
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}
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// Allocations may fail in several threads at about the same time,
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// resulting in multiple gc requests.  We only want to do one of them.
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// In case a GC locker is active and the need for a GC is already signaled,
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// we want to skip this GC attempt altogether, without doing a futile
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// safepoint operation.
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bool VM_GC_Operation::skip_operation() const {
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  bool skip = (_gc_count_before != Universe::heap()->total_collections());
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  if (_full && skip) {
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    skip = (_full_gc_count_before != Universe::heap()->total_full_collections());
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  }
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  if (!skip && GCLocker::is_active_and_needs_gc()) {
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    skip = Universe::heap()->is_maximal_no_gc();
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    assert(!(skip && (_gc_cause == GCCause::_gc_locker)),
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           "GCLocker cannot be active when initiating GC");
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  }
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  return skip;
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}
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bool VM_GC_Operation::doit_prologue() {
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  assert(Thread::current()->is_Java_thread(), "just checking");
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  assert(((_gc_cause != GCCause::_no_gc) &&
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          (_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause");
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  // To be able to handle a GC the VM initialization needs to be completed.
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  if (!is_init_completed()) {
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    vm_exit_during_initialization(
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      err_msg("GC triggered before VM initialization completed. Try increasing "
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              "NewSize, current value " SIZE_FORMAT "%s.",
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              byte_size_in_proper_unit(NewSize),
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              proper_unit_for_byte_size(NewSize)));
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  }
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  // If the GC count has changed someone beat us to the collection
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  Heap_lock->lock();
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  // Check invocations
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  if (skip_operation()) {
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    // skip collection
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    Heap_lock->unlock();
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    _prologue_succeeded = false;
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  } else {
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    _prologue_succeeded = true;
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  }
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  return _prologue_succeeded;
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}
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void VM_GC_Operation::doit_epilogue() {
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  assert(Thread::current()->is_Java_thread(), "just checking");
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  // Clean up old interpreter OopMap entries that were replaced
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  // during the GC thread root traversal.
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  OopMapCache::cleanup_old_entries();
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  if (Universe::has_reference_pending_list()) {
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    Heap_lock->notify_all();
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  }
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  Heap_lock->unlock();
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}
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bool VM_GC_HeapInspection::skip_operation() const {
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  return false;
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}
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bool VM_GC_HeapInspection::collect() {
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  if (GCLocker::is_active()) {
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    return false;
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  }
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  Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection);
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  return true;
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}
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void VM_GC_HeapInspection::doit() {
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  HandleMark hm;
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  Universe::heap()->ensure_parsability(false); // must happen, even if collection does
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                                               // not happen (e.g. due to GCLocker)
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                                               // or _full_gc being false
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  if (_full_gc) {
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    if (!collect()) {
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      // The collection attempt was skipped because the gc locker is held.
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      // The following dump may then be a tad misleading to someone expecting
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      // only live objects to show up in the dump (see CR 6944195). Just issue
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      // a suitable warning in that case and do not attempt to do a collection.
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      // The latter is a subtle point, because even a failed attempt
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      // to GC will, in fact, induce one in the future, which we
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      // probably want to avoid in this case because the GC that we may
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      // be about to attempt holds value for us only
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      // if it happens now and not if it happens in the eventual
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      // future.
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      log_warning(gc)("GC locker is held; pre-dump GC was skipped");
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    }
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  }
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  HeapInspection inspect(_csv_format, _print_help, _print_class_stats,
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                         _columns);
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  inspect.heap_inspection(_out);
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}
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void VM_GenCollectForAllocation::doit() {
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  SvcGCMarker sgcm(SvcGCMarker::MINOR);
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  GenCollectedHeap* gch = GenCollectedHeap::heap();
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  GCCauseSetter gccs(gch, _gc_cause);
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  _result = gch->satisfy_failed_allocation(_word_size, _tlab);
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  assert(gch->is_in_reserved_or_null(_result), "result not in heap");
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  if (_result == NULL && GCLocker::is_active_and_needs_gc()) {
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    set_gc_locked();
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  }
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}
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void VM_GenCollectFull::doit() {
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  SvcGCMarker sgcm(SvcGCMarker::FULL);
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  GenCollectedHeap* gch = GenCollectedHeap::heap();
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  GCCauseSetter gccs(gch, _gc_cause);
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  gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_generation);
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}
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VM_CollectForMetadataAllocation::VM_CollectForMetadataAllocation(ClassLoaderData* loader_data,
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                                                                 size_t size,
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                                                                 Metaspace::MetadataType mdtype,
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                                                                 uint gc_count_before,
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                                                                 uint full_gc_count_before,
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                                                                 GCCause::Cause gc_cause)
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    : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true),
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      _loader_data(loader_data), _size(size), _mdtype(mdtype), _result(NULL) {
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  assert(_size != 0, "An allocation should always be requested with this operation.");
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  AllocTracer::send_allocation_requiring_gc_event(_size * HeapWordSize, GCId::peek());
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}
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// Returns true iff concurrent GCs unloads metadata.
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bool VM_CollectForMetadataAllocation::initiate_concurrent_GC() {
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#if INCLUDE_ALL_GCS
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  if (UseConcMarkSweepGC && CMSClassUnloadingEnabled) {
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    MetaspaceGC::set_should_concurrent_collect(true);
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    return true;
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  }
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  if (UseG1GC && ClassUnloadingWithConcurrentMark) {
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    G1CollectedHeap* g1h = G1CollectedHeap::heap();
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    g1h->g1_policy()->collector_state()->set_initiate_conc_mark_if_possible(true);
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    GCCauseSetter x(g1h, _gc_cause);
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    // At this point we are supposed to start a concurrent cycle. We
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    // will do so if one is not already in progress.
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    bool should_start = g1h->g1_policy()->force_initial_mark_if_outside_cycle(_gc_cause);
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    if (should_start) {
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      double pause_target = g1h->g1_policy()->max_pause_time_ms();
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      g1h->do_collection_pause_at_safepoint(pause_target);
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    }
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    return true;
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  }
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#endif
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  return false;
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}
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void VM_CollectForMetadataAllocation::doit() {
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  SvcGCMarker sgcm(SvcGCMarker::FULL);
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  CollectedHeap* heap = Universe::heap();
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  GCCauseSetter gccs(heap, _gc_cause);
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  // Check again if the space is available.  Another thread
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  // may have similarly failed a metadata allocation and induced
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  // a GC that freed space for the allocation.
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  if (!MetadataAllocationFailALot) {
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    _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype);
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    if (_result != NULL) {
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      return;
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    }
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  }
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  if (initiate_concurrent_GC()) {
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    // For CMS and G1 expand since the collection is going to be concurrent.
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    _result = _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype);
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    if (_result != NULL) {
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      return;
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    }
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    log_debug(gc)("%s full GC for Metaspace", UseConcMarkSweepGC ? "CMS" : "G1");
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  }
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  // Don't clear the soft refs yet.
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  heap->collect_as_vm_thread(GCCause::_metadata_GC_threshold);
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  // After a GC try to allocate without expanding.  Could fail
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  // and expansion will be tried below.
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  _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype);
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  if (_result != NULL) {
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    return;
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  }
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  // If still failing, allow the Metaspace to expand.
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  // See delta_capacity_until_GC() for explanation of the
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  // amount of the expansion.
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  // This should work unless there really is no more space
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  // or a MaxMetaspaceSize has been specified on the command line.
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  _result = _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype);
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  if (_result != NULL) {
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    return;
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  }
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  // If expansion failed, do a collection clearing soft references.
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  heap->collect_as_vm_thread(GCCause::_metadata_GC_clear_soft_refs);
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  _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype);
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  if (_result != NULL) {
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    return;
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  }
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  log_debug(gc)("After Metaspace GC failed to allocate size " SIZE_FORMAT, _size);
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  if (GCLocker::is_active_and_needs_gc()) {
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    set_gc_locked();
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  }
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}
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VM_CollectForAllocation::VM_CollectForAllocation(size_t word_size, uint gc_count_before, GCCause::Cause cause)
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    : VM_GC_Operation(gc_count_before, cause), _result(NULL), _word_size(word_size) {
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  // Only report if operation was really caused by an allocation.
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  if (_word_size != 0) {
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    AllocTracer::send_allocation_requiring_gc_event(_word_size * HeapWordSize, GCId::peek());
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  }
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}