src/hotspot/share/gc/z/zCollectedHeap.cpp - platform/libcore - Git at Google

 /*
  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 #include "precompiled.hpp"
 #include "gc/shared/gcHeapSummary.hpp"
 #include "gc/z/zCollectedHeap.hpp"
 #include "gc/z/zGlobals.hpp"
 #include "gc/z/zHeap.inline.hpp"
 #include "gc/z/zNMethodTable.hpp"
 #include "gc/z/zServiceability.hpp"
 #include "gc/z/zStat.hpp"
 #include "gc/z/zUtils.inline.hpp"
 #include "memory/iterator.hpp"
 #include "runtime/mutexLocker.hpp"

 ZCollectedHeap* ZCollectedHeap::heap() {
   CollectedHeap* heap = Universe::heap();
   assert(heap != NULL, "Uninitialized access to ZCollectedHeap::heap()");
   assert(heap->kind() == CollectedHeap::Z, "Invalid name");
   return (ZCollectedHeap*)heap;
 }

 ZCollectedHeap::ZCollectedHeap(ZCollectorPolicy* policy) :
     _collector_policy(policy),
     _soft_ref_policy(),
     _barrier_set(),
     _initialize(&_barrier_set),
     _heap(),
     _director(new ZDirector()),
     _driver(new ZDriver()),
     _stat(new ZStat()),
     _runtime_workers() {}

 CollectedHeap::Name ZCollectedHeap::kind() const {
   return CollectedHeap::Z;
 }

 const char* ZCollectedHeap::name() const {
   return ZGCName;
 }

 jint ZCollectedHeap::initialize() {
   if (!_heap.is_initialized()) {
     return JNI_ENOMEM;
   }

   initialize_reserved_region((HeapWord*)ZAddressReservedStart(),
                              (HeapWord*)ZAddressReservedEnd());

   return JNI_OK;
 }

 void ZCollectedHeap::initialize_serviceability() {
   _heap.serviceability_initialize();
 }

 void ZCollectedHeap::stop() {
   _director->stop();
   _driver->stop();
   _stat->stop();
 }

 CollectorPolicy* ZCollectedHeap::collector_policy() const {
   return _collector_policy;
 }

 SoftRefPolicy* ZCollectedHeap::soft_ref_policy() {
   return &_soft_ref_policy;
 }

 size_t ZCollectedHeap::max_capacity() const {
   return _heap.max_capacity();
 }

 size_t ZCollectedHeap::capacity() const {
   return _heap.capacity();
 }

 size_t ZCollectedHeap::used() const {
   return _heap.used();
 }

 bool ZCollectedHeap::is_maximal_no_gc() const {
   // Not supported
   ShouldNotReachHere();
   return false;
 }

 bool ZCollectedHeap::is_scavengable(oop obj) {
   return false;
 }

 bool ZCollectedHeap::is_in(const void* p) const {
   return is_in_reserved(p) && _heap.is_in((uintptr_t)p);
 }

 bool ZCollectedHeap::is_in_closed_subset(const void* p) const {
   return is_in(p);
 }

 HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) {
   const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size));
   const uintptr_t addr = _heap.alloc_tlab(size_in_bytes);

   if (addr != 0) {
     *actual_size = requested_size;
   }

   return (HeapWord*)addr;
 }

 HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) {
   const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size));
   return (HeapWord*)_heap.alloc_object(size_in_bytes);
 }

 MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
                                                              size_t size,
                                                              Metaspace::MetadataType mdtype) {
   MetaWord* result;

   // Start asynchronous GC
   collect(GCCause::_metadata_GC_threshold);

   // Expand and retry allocation
   result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
   if (result != NULL) {
     return result;
   }

   // Start synchronous GC
   collect(GCCause::_metadata_GC_clear_soft_refs);

   // Retry allocation
   result = loader_data->metaspace_non_null()->allocate(size, mdtype);
   if (result != NULL) {
     return result;
   }

   // Expand and retry allocation
   result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
   if (result != NULL) {
     return result;
   }

   // Out of memory
   return NULL;
 }

 void ZCollectedHeap::collect(GCCause::Cause cause) {
   _driver->collect(cause);
 }

 void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) {
   // These collection requests are ignored since ZGC can't run a synchronous
   // GC cycle from within the VM thread. This is considered benign, since the
   // only GC causes coming in here should be heap dumper and heap inspector.
   // However, neither the heap dumper nor the heap inspector really need a GC
   // to happen, but the result of their heap iterations might in that case be
   // less accurate since they might include objects that would otherwise have
   // been collected by a GC.
   assert(Thread::current()->is_VM_thread(), "Should be the VM thread");
   guarantee(cause == GCCause::_heap_dump ||
             cause == GCCause::_heap_inspection, "Invalid cause");
 }

 void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) {
   // Not supported
   ShouldNotReachHere();
 }

 bool ZCollectedHeap::supports_tlab_allocation() const {
   return true;
 }

 size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const {
   return _heap.tlab_capacity();
 }

 size_t ZCollectedHeap::tlab_used(Thread* ignored) const {
   return _heap.tlab_used();
 }

 size_t ZCollectedHeap::max_tlab_size() const {
   return _heap.max_tlab_size();
 }

 size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const {
   return _heap.unsafe_max_tlab_alloc();
 }

 bool ZCollectedHeap::can_elide_tlab_store_barriers() const {
   return false;
 }

 bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
   // Not supported
   ShouldNotReachHere();
   return true;
 }

 bool ZCollectedHeap::card_mark_must_follow_store() const {
   // Not supported
   ShouldNotReachHere();
   return false;
 }

 GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() {
   return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager());
 }

 GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() {
   return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool());
 }

 void ZCollectedHeap::object_iterate(ObjectClosure* cl) {
   _heap.object_iterate(cl, true /* visit_referents */);
 }

 void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) {
   _heap.object_iterate(cl, true /* visit_referents */);
 }

 HeapWord* ZCollectedHeap::block_start(const void* addr) const {
   return (HeapWord*)_heap.block_start((uintptr_t)addr);
 }

 size_t ZCollectedHeap::block_size(const HeapWord* addr) const {
   size_t size_in_bytes = _heap.block_size((uintptr_t)addr);
   return ZUtils::bytes_to_words(size_in_bytes);
 }

 bool ZCollectedHeap::block_is_obj(const HeapWord* addr) const {
   return _heap.block_is_obj((uintptr_t)addr);
 }

 void ZCollectedHeap::keep_alive(oop obj) {
   _heap.keep_alive(obj);
 }

 void ZCollectedHeap::register_nmethod(nmethod* nm) {
   assert_locked_or_safepoint(CodeCache_lock);
   ZNMethodTable::register_nmethod(nm);
 }

 void ZCollectedHeap::unregister_nmethod(nmethod* nm) {
   assert_locked_or_safepoint(CodeCache_lock);
   ZNMethodTable::unregister_nmethod(nm);
 }

 void ZCollectedHeap::verify_nmethod(nmethod* nm) {
   // Does nothing
 }

 WorkGang* ZCollectedHeap::get_safepoint_workers() {
   return _runtime_workers.workers();
 }

 jlong ZCollectedHeap::millis_since_last_gc() {
   return ZStatCycle::time_since_last() / MILLIUNITS;
 }

 void ZCollectedHeap::gc_threads_do(ThreadClosure* tc) const {
   tc->do_thread(_director);
   tc->do_thread(_driver);
   tc->do_thread(_stat);
   _heap.worker_threads_do(tc);
   _runtime_workers.threads_do(tc);
 }

 VirtualSpaceSummary ZCollectedHeap::create_heap_space_summary() {
   const size_t capacity_in_words = capacity() / HeapWordSize;
   const size_t max_capacity_in_words = max_capacity() / HeapWordSize;
   return VirtualSpaceSummary(reserved_region().start(),
                              reserved_region().start() + capacity_in_words,
                              reserved_region().start() + max_capacity_in_words);
 }

 void ZCollectedHeap::prepare_for_verify() {
   // Does nothing
 }

 void ZCollectedHeap::print_on(outputStream* st) const {
   _heap.print_on(st);
 }

 void ZCollectedHeap::print_on_error(outputStream* st) const {
   CollectedHeap::print_on_error(st);

   st->print_cr("Address Space");
   st->print_cr( "     Start:             " PTR_FORMAT, ZAddressSpaceStart);
   st->print_cr( "     End:               " PTR_FORMAT, ZAddressSpaceEnd);
   st->print_cr( "     Size:              " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressSpaceSize, ZAddressSpaceSize);
   st->print_cr( "Heap");
   st->print_cr( "     GlobalPhase:       %u", ZGlobalPhase);
   st->print_cr( "     GlobalSeqNum:      %u", ZGlobalSeqNum);
   st->print_cr( "     Offset Max:        " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressOffsetMax, ZAddressOffsetMax);
   st->print_cr( "     Page Size Small:   " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeSmall, ZPageSizeSmall);
   st->print_cr( "     Page Size Medium:  " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeMedium, ZPageSizeMedium);
   st->print_cr( "Metadata Bits");
   st->print_cr( "     Good:              " PTR_FORMAT, ZAddressGoodMask);
   st->print_cr( "     Bad:               " PTR_FORMAT, ZAddressBadMask);
   st->print_cr( "     WeakBad:           " PTR_FORMAT, ZAddressWeakBadMask);
   st->print_cr( "     Marked:            " PTR_FORMAT, ZAddressMetadataMarked);
   st->print_cr( "     Remapped:          " PTR_FORMAT, ZAddressMetadataRemapped);
 }

 void ZCollectedHeap::print_extended_on(outputStream* st) const {
   _heap.print_extended_on(st);
 }

 void ZCollectedHeap::print_gc_threads_on(outputStream* st) const {
   _director->print_on(st);
   st->cr();
   _driver->print_on(st);
   st->cr();
   _stat->print_on(st);
   st->cr();
   _heap.print_worker_threads_on(st);
   _runtime_workers.print_threads_on(st);
 }

 void ZCollectedHeap::print_tracing_info() const {
   // Does nothing
 }

 void ZCollectedHeap::verify(VerifyOption option /* ignored */) {
   _heap.verify();
 }

 bool ZCollectedHeap::is_oop(oop object) const {
   return CollectedHeap::is_oop(object) && _heap.is_oop(object);
 }
	/*
	* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	#include "precompiled.hpp"
	#include "gc/shared/gcHeapSummary.hpp"
	#include "gc/z/zCollectedHeap.hpp"
	#include "gc/z/zGlobals.hpp"
	#include "gc/z/zHeap.inline.hpp"
	#include "gc/z/zNMethodTable.hpp"
	#include "gc/z/zServiceability.hpp"
	#include "gc/z/zStat.hpp"
	#include "gc/z/zUtils.inline.hpp"
	#include "memory/iterator.hpp"
	#include "runtime/mutexLocker.hpp"

	ZCollectedHeap* ZCollectedHeap::heap() {
	CollectedHeap* heap = Universe::heap();
	assert(heap != NULL, "Uninitialized access to ZCollectedHeap::heap()");
	assert(heap->kind() == CollectedHeap::Z, "Invalid name");
	return (ZCollectedHeap*)heap;
	}

	ZCollectedHeap::ZCollectedHeap(ZCollectorPolicy* policy) :
	_collector_policy(policy),
	_soft_ref_policy(),
	_barrier_set(),
	_initialize(&_barrier_set),
	_heap(),
	_director(new ZDirector()),
	_driver(new ZDriver()),
	_stat(new ZStat()),
	_runtime_workers() {}

	CollectedHeap::Name ZCollectedHeap::kind() const {
	return CollectedHeap::Z;
	}

	const char* ZCollectedHeap::name() const {
	return ZGCName;
	}

	jint ZCollectedHeap::initialize() {
	if (!_heap.is_initialized()) {
	return JNI_ENOMEM;
	}

	initialize_reserved_region((HeapWord*)ZAddressReservedStart(),
	(HeapWord*)ZAddressReservedEnd());

	return JNI_OK;
	}

	void ZCollectedHeap::initialize_serviceability() {
	_heap.serviceability_initialize();
	}

	void ZCollectedHeap::stop() {
	_director->stop();
	_driver->stop();
	_stat->stop();
	}

	CollectorPolicy* ZCollectedHeap::collector_policy() const {
	return _collector_policy;
	}

	SoftRefPolicy* ZCollectedHeap::soft_ref_policy() {
	return &_soft_ref_policy;
	}

	size_t ZCollectedHeap::max_capacity() const {
	return _heap.max_capacity();
	}

	size_t ZCollectedHeap::capacity() const {
	return _heap.capacity();
	}

	size_t ZCollectedHeap::used() const {
	return _heap.used();
	}

	bool ZCollectedHeap::is_maximal_no_gc() const {
	// Not supported
	ShouldNotReachHere();
	return false;
	}

	bool ZCollectedHeap::is_scavengable(oop obj) {
	return false;
	}

	bool ZCollectedHeap::is_in(const void* p) const {
	return is_in_reserved(p) && _heap.is_in((uintptr_t)p);
	}

	bool ZCollectedHeap::is_in_closed_subset(const void* p) const {
	return is_in(p);
	}

	HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) {
	const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size));
	const uintptr_t addr = _heap.alloc_tlab(size_in_bytes);

	if (addr != 0) {
	*actual_size = requested_size;
	}

	return (HeapWord*)addr;
	}

	HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) {
	const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size));
	return (HeapWord*)_heap.alloc_object(size_in_bytes);
	}

	MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
	size_t size,
	Metaspace::MetadataType mdtype) {
	MetaWord* result;

	// Start asynchronous GC
	collect(GCCause::_metadata_GC_threshold);

	// Expand and retry allocation
	result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
	if (result != NULL) {
	return result;
	}

	// Start synchronous GC
	collect(GCCause::_metadata_GC_clear_soft_refs);

	// Retry allocation
	result = loader_data->metaspace_non_null()->allocate(size, mdtype);
	if (result != NULL) {
	return result;
	}

	// Expand and retry allocation
	result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
	if (result != NULL) {
	return result;
	}

	// Out of memory
	return NULL;
	}

	void ZCollectedHeap::collect(GCCause::Cause cause) {
	_driver->collect(cause);
	}

	void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) {
	// These collection requests are ignored since ZGC can't run a synchronous
	// GC cycle from within the VM thread. This is considered benign, since the
	// only GC causes coming in here should be heap dumper and heap inspector.
	// However, neither the heap dumper nor the heap inspector really need a GC
	// to happen, but the result of their heap iterations might in that case be
	// less accurate since they might include objects that would otherwise have
	// been collected by a GC.
	assert(Thread::current()->is_VM_thread(), "Should be the VM thread");
	guarantee(cause == GCCause::_heap_dump \|\|
	cause == GCCause::_heap_inspection, "Invalid cause");
	}

	void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) {
	// Not supported
	ShouldNotReachHere();
	}

	bool ZCollectedHeap::supports_tlab_allocation() const {
	return true;
	}

	size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const {
	return _heap.tlab_capacity();
	}

	size_t ZCollectedHeap::tlab_used(Thread* ignored) const {
	return _heap.tlab_used();
	}

	size_t ZCollectedHeap::max_tlab_size() const {
	return _heap.max_tlab_size();
	}

	size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const {
	return _heap.unsafe_max_tlab_alloc();
	}

	bool ZCollectedHeap::can_elide_tlab_store_barriers() const {
	return false;
	}

	bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
	// Not supported
	ShouldNotReachHere();
	return true;
	}

	bool ZCollectedHeap::card_mark_must_follow_store() const {
	// Not supported
	ShouldNotReachHere();
	return false;
	}

	GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() {
	return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager());
	}

	GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() {
	return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool());
	}

	void ZCollectedHeap::object_iterate(ObjectClosure* cl) {
	_heap.object_iterate(cl, true /* visit_referents */);
	}

	void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) {
	_heap.object_iterate(cl, true /* visit_referents */);
	}

	HeapWord* ZCollectedHeap::block_start(const void* addr) const {
	return (HeapWord*)_heap.block_start((uintptr_t)addr);
	}

	size_t ZCollectedHeap::block_size(const HeapWord* addr) const {
	size_t size_in_bytes = _heap.block_size((uintptr_t)addr);
	return ZUtils::bytes_to_words(size_in_bytes);
	}

	bool ZCollectedHeap::block_is_obj(const HeapWord* addr) const {
	return _heap.block_is_obj((uintptr_t)addr);
	}

	void ZCollectedHeap::keep_alive(oop obj) {
	_heap.keep_alive(obj);
	}

	void ZCollectedHeap::register_nmethod(nmethod* nm) {
	assert_locked_or_safepoint(CodeCache_lock);
	ZNMethodTable::register_nmethod(nm);
	}

	void ZCollectedHeap::unregister_nmethod(nmethod* nm) {
	assert_locked_or_safepoint(CodeCache_lock);
	ZNMethodTable::unregister_nmethod(nm);
	}

	void ZCollectedHeap::verify_nmethod(nmethod* nm) {
	// Does nothing
	}

	WorkGang* ZCollectedHeap::get_safepoint_workers() {
	return _runtime_workers.workers();
	}

	jlong ZCollectedHeap::millis_since_last_gc() {
	return ZStatCycle::time_since_last() / MILLIUNITS;
	}

	void ZCollectedHeap::gc_threads_do(ThreadClosure* tc) const {
	tc->do_thread(_director);
	tc->do_thread(_driver);
	tc->do_thread(_stat);
	_heap.worker_threads_do(tc);
	_runtime_workers.threads_do(tc);
	}

	VirtualSpaceSummary ZCollectedHeap::create_heap_space_summary() {
	const size_t capacity_in_words = capacity() / HeapWordSize;
	const size_t max_capacity_in_words = max_capacity() / HeapWordSize;
	return VirtualSpaceSummary(reserved_region().start(),
	reserved_region().start() + capacity_in_words,
	reserved_region().start() + max_capacity_in_words);
	}

	void ZCollectedHeap::prepare_for_verify() {
	// Does nothing
	}

	void ZCollectedHeap::print_on(outputStream* st) const {
	_heap.print_on(st);
	}

	void ZCollectedHeap::print_on_error(outputStream* st) const {
	CollectedHeap::print_on_error(st);

	st->print_cr("Address Space");
	st->print_cr( " Start: " PTR_FORMAT, ZAddressSpaceStart);
	st->print_cr( " End: " PTR_FORMAT, ZAddressSpaceEnd);
	st->print_cr( " Size: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressSpaceSize, ZAddressSpaceSize);
	st->print_cr( "Heap");
	st->print_cr( " GlobalPhase: %u", ZGlobalPhase);
	st->print_cr( " GlobalSeqNum: %u", ZGlobalSeqNum);
	st->print_cr( " Offset Max: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressOffsetMax, ZAddressOffsetMax);
	st->print_cr( " Page Size Small: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeSmall, ZPageSizeSmall);
	st->print_cr( " Page Size Medium: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeMedium, ZPageSizeMedium);
	st->print_cr( "Metadata Bits");
	st->print_cr( " Good: " PTR_FORMAT, ZAddressGoodMask);
	st->print_cr( " Bad: " PTR_FORMAT, ZAddressBadMask);
	st->print_cr( " WeakBad: " PTR_FORMAT, ZAddressWeakBadMask);
	st->print_cr( " Marked: " PTR_FORMAT, ZAddressMetadataMarked);
	st->print_cr( " Remapped: " PTR_FORMAT, ZAddressMetadataRemapped);
	}

	void ZCollectedHeap::print_extended_on(outputStream* st) const {
	_heap.print_extended_on(st);
	}

	void ZCollectedHeap::print_gc_threads_on(outputStream* st) const {
	_director->print_on(st);
	st->cr();
	_driver->print_on(st);
	st->cr();
	_stat->print_on(st);
	st->cr();
	_heap.print_worker_threads_on(st);
	_runtime_workers.print_threads_on(st);
	}

	void ZCollectedHeap::print_tracing_info() const {
	// Does nothing
	}

	void ZCollectedHeap::verify(VerifyOption option /* ignored */) {
	_heap.verify();
	}

	bool ZCollectedHeap::is_oop(oop object) const {
	return CollectedHeap::is_oop(object) && _heap.is_oop(object);
	}