author | brutisso |
Thu, 10 Dec 2015 14:57:55 +0100 | |
changeset 35061 | be6025ebffea |
parent 31358 | 693058672cc6 |
child 35227 | 176e593eb364 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2005, 2015, 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/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 "memory/oopFactory.hpp" |
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#include "logging/log.hpp" |
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#include "oops/instanceKlass.hpp" |
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#include "oops/instanceRefKlass.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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#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->collector_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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void VM_GC_Operation::acquire_pending_list_lock() { |
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// we may enter this with pending exception set |
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InstanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); |
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} |
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void VM_GC_Operation::release_and_notify_pending_list_lock() { |
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InstanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); |
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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 && GC_locker::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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"GC_locker 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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acquire_pending_list_lock(); |
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// If the GC count has changed someone beat us to the collection |
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// Get the Heap_lock after the pending_list_lock. |
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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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release_and_notify_pending_list_lock(); |
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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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// Release the Heap_lock first. |
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Heap_lock->unlock(); |
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release_and_notify_pending_list_lock(); |
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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 (GC_locker::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 GC_locker) |
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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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warning("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 && GC_locker::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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// 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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|
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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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|
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log_debug(gc)("%s full GC for Metaspace", UseConcMarkSweepGC ? "CMS" : "G1"); |
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} |
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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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|
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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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|
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// If expansion failed, do a last-ditch collection and try allocating |
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// again. A last-ditch collection will clear softrefs. This |
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// behavior is similar to the last-ditch collection done for perm |
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// gen when it was full and a collection for failed allocation |
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// did not free perm gen space. |
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heap->collect_as_vm_thread(GCCause::_last_ditch_collection); |
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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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log_debug(gc)("After Metaspace GC failed to allocate size " SIZE_FORMAT, _size); |
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|
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if (GC_locker::is_active_and_needs_gc()) { |
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set_gc_locked(); |
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} |
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} |