--- /dev/null 2018-04-03 12:55:20.301839954 +0200 +++ new/src/hotspot/share/gc/z/zCollectedHeap.cpp 2018-06-08 19:46:00.581869659 +0200 @@ -0,0 +1,348 @@ +/* + * 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 "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 comming 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 ZCollectedHeap::memory_managers() { + return GrowableArray(1, 1, _heap.serviceability_memory_manager()); +} + +GrowableArray ZCollectedHeap::memory_pools() { + return GrowableArray(1, 1, _heap.serviceability_memory_pool()); +} + +void ZCollectedHeap::object_iterate(ObjectClosure* cl) { + _heap.object_iterate(cl); +} + +void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) { + _heap.object_iterate(cl); +} + +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::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); +}