author | jmasa |
Thu, 04 Oct 2012 10:40:23 -0700 | |
changeset 13927 | 332925e36741 |
parent 13755 | a00f5de57d30 |
child 15482 | 470d0b0c09f1 |
child 15437 | eabd4555d072 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2005, 2012, 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_implementation/shared/vmGCOperations.hpp" |
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#include "memory/gcLocker.inline.hpp" |
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#include "memory/genCollectedHeap.hpp" |
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#include "memory/oopFactory.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/preserveException.hpp" |
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#ifndef SERIALGC |
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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#endif |
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#ifndef USDT2 |
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HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); |
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HS_DTRACE_PROBE_DECL(hotspot, gc__end); |
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#endif /* !USDT2 */ |
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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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#ifndef USDT2 |
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HS_DTRACE_PROBE1(hotspot, gc__begin, full); |
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HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
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#else /* USDT2 */ |
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HOTSPOT_GC_BEGIN( |
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full); |
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#endif /* USDT2 */ |
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} |
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void VM_GC_Operation::notify_gc_end() { |
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#ifndef USDT2 |
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HS_DTRACE_PROBE(hotspot, gc__end); |
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HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); |
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#else /* USDT2 */ |
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HOTSPOT_GC_END( |
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); |
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#endif /* USDT2 */ |
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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 signalled, |
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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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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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SharedHeap* sh = SharedHeap::heap(); |
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if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = 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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SharedHeap* sh = SharedHeap::heap(); |
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if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; |
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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::doit_prologue() { |
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if (Universe::heap()->supports_heap_inspection()) { |
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return VM_GC_Operation::doit_prologue(); |
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} else { |
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return false; |
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} |
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} |
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bool VM_GC_HeapInspection::skip_operation() const { |
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assert(Universe::heap()->supports_heap_inspection(), "huh?"); |
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return false; |
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} |
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void VM_GC_HeapInspection::doit() { |
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HandleMark hm; |
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CollectedHeap* ch = Universe::heap(); |
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ch->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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if (_full_gc) { |
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// The collection attempt below would be skipped anyway if |
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// the gc locker is held. The following dump may then be a tad |
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// misleading to someone expecting only live objects to show |
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// up in the dump (see CR 6944195). Just issue a suitable warning |
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// 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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if (GC_locker::is_active()) { |
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warning("GC locker is held; pre-dump GC was skipped"); |
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} else { |
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ch->collect_as_vm_thread(GCCause::_heap_inspection); |
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} |
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} |
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HeapInspection::heap_inspection(_out, _need_prologue /* need_prologue */); |
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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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_res = gch->satisfy_failed_allocation(_size, _tlab); |
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assert(gch->is_in_reserved_or_null(_res), "result not in heap"); |
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if (_res == 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_level); |
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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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} |
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if (_result == NULL) { |
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if (UseConcMarkSweepGC) { |
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if (CMSClassUnloadingEnabled) { |
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MetaspaceGC::set_should_concurrent_collect(true); |
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} |
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// For CMS expand since the collection is going to be concurrent. |
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_result = |
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_loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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} |
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if (_result == NULL) { |
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// Don't clear the soft refs. This GC is for reclaiming metadata |
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// and is unrelated to the fullness of the Java heap which should |
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// be the criteria for clearing SoftReferences. |
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if (Verbose && PrintGCDetails && UseConcMarkSweepGC) { |
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gclog_or_tty->print_cr("\nCMS full GC for Metaspace"); |
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} |
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heap->collect_as_vm_thread(GCCause::_metadata_GC_threshold); |
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_result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); |
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} |
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if (_result == NULL && !UseConcMarkSweepGC /* CMS already tried */) { |
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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 = |
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_loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); |
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|
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} |
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if (Verbose && PrintGCDetails && _result == NULL) { |
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gclog_or_tty->print_cr("\nAfter Metaspace GC failed to allocate size " |
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SIZE_FORMAT, _size); |
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} |
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} |
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|
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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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} |