--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/z/zCollectedHeap.cpp Tue Jun 12 17:40:28 2018 +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<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);
+}
+
+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);
+}