src/hotspot/share/gc/z/zRootsIterator.cpp
author rehn
Thu, 14 Jun 2018 07:26:27 +0200
changeset 50556 e5a40146791b
parent 50525 767cdb97f103
child 50875 2217b2fc29ea
permissions -rw-r--r--
8204613: StringTable: Calculates wrong number of uncleaned items. Reviewed-by: pliden, coleenp
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/*
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 * Copyright (c) 2015, 2018, 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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#include "precompiled.hpp"
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#include "classfile/classLoaderData.hpp"
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#include "classfile/stringTable.hpp"
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#include "classfile/symbolTable.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "code/codeCache.hpp"
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#include "compiler/oopMap.hpp"
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#include "gc/shared/oopStorageParState.inline.hpp"
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#include "gc/z/zGlobals.hpp"
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#include "gc/z/zNMethodTable.hpp"
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#include "gc/z/zOopClosures.inline.hpp"
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#include "gc/z/zRootsIterator.hpp"
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#include "gc/z/zStat.hpp"
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#include "gc/z/zThreadLocalData.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.hpp"
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#include "prims/jvmtiExport.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/jniHandles.hpp"
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#include "runtime/thread.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/synchronizer.hpp"
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#include "services/management.hpp"
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#include "utilities/debug.hpp"
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#if INCLUDE_JFR
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#include "jfr/jfr.hpp"
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#endif
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static const ZStatSubPhase ZSubPhasePauseRootsSetup("Pause Roots Setup");
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static const ZStatSubPhase ZSubPhasePauseRoots("Pause Roots");
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static const ZStatSubPhase ZSubPhasePauseRootsTeardown("Pause Roots Teardown");
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static const ZStatSubPhase ZSubPhasePauseRootsUniverse("Pause Roots Universe");
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static const ZStatSubPhase ZSubPhasePauseRootsVMWeakHandles("Pause Roots VMWeakHandles");
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static const ZStatSubPhase ZSubPhasePauseRootsJNIHandles("Pause Roots JNIHandles");
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static const ZStatSubPhase ZSubPhasePauseRootsJNIWeakHandles("Pause Roots JNIWeakHandles");
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static const ZStatSubPhase ZSubPhasePauseRootsObjectSynchronizer("Pause Roots ObjectSynchronizer");
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static const ZStatSubPhase ZSubPhasePauseRootsManagement("Pause Roots Management");
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static const ZStatSubPhase ZSubPhasePauseRootsJVMTIExport("Pause Roots JVMTIExport");
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static const ZStatSubPhase ZSubPhasePauseRootsJVMTIWeakExport("Pause Roots JVMTIWeakExport");
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static const ZStatSubPhase ZSubPhasePauseRootsJFRWeak("Pause Roots JRFWeak");
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static const ZStatSubPhase ZSubPhasePauseRootsSystemDictionary("Pause Roots SystemDictionary");
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static const ZStatSubPhase ZSubPhasePauseRootsClassLoaderDataGraph("Pause Roots ClassLoaderDataGraph");
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static const ZStatSubPhase ZSubPhasePauseRootsThreads("Pause Roots Threads");
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static const ZStatSubPhase ZSubPhasePauseRootsCodeCache("Pause Roots CodeCache");
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static const ZStatSubPhase ZSubPhasePauseRootsStringTable("Pause Roots StringTable");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsSetup("Pause Weak Roots Setup");
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static const ZStatSubPhase ZSubPhasePauseWeakRoots("Pause Weak Roots");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsTeardown("Pause Weak Roots Teardown");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsVMWeakHandles("Pause Weak Roots VMWeakHandles");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsJNIWeakHandles("Pause Weak Roots JNIWeakHandles");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsJVMTIWeakExport("Pause Weak Roots JVMTIWeakExport");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsJFRWeak("Pause Weak Roots JFRWeak");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsSymbolTable("Pause Weak Roots SymbolTable");
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static const ZStatSubPhase ZSubPhasePauseWeakRootsStringTable("Pause Weak Roots StringTable");
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static const ZStatSubPhase ZSubPhaseConcurrentWeakRoots("Concurrent Weak Roots");
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static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsVMWeakHandles("Concurrent Weak Roots VMWeakHandles");
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static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsJNIWeakHandles("Concurrent Weak Roots JNIWeakHandles");
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static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsStringTable("Concurrent Weak Roots StringTable");
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template <typename T, void (T::*F)(OopClosure*)>
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ZSerialOopsDo<T, F>::ZSerialOopsDo(T* iter) :
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    _iter(iter),
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    _claimed(false) {}
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template <typename T, void (T::*F)(OopClosure*)>
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void ZSerialOopsDo<T, F>::oops_do(OopClosure* cl) {
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  if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
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    (_iter->*F)(cl);
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  }
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}
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template <typename T, void (T::*F)(OopClosure*)>
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ZParallelOopsDo<T, F>::ZParallelOopsDo(T* iter) :
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    _iter(iter),
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    _completed(false) {}
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template <typename T, void (T::*F)(OopClosure*)>
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void ZParallelOopsDo<T, F>::oops_do(OopClosure* cl) {
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  if (!_completed) {
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    (_iter->*F)(cl);
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    if (!_completed) {
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      _completed = true;
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    }
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  }
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}
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template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
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ZSerialWeakOopsDo<T, F>::ZSerialWeakOopsDo(T* iter) :
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    _iter(iter),
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    _claimed(false) {}
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template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
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void ZSerialWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl) {
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  if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
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    (_iter->*F)(is_alive, cl);
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  }
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}
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template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
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ZParallelWeakOopsDo<T, F>::ZParallelWeakOopsDo(T* iter) :
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    _iter(iter),
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    _completed(false) {}
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template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
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void ZParallelWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl) {
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  if (!_completed) {
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    (_iter->*F)(is_alive, cl);
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    if (!_completed) {
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      _completed = true;
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    }
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  }
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}
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ZRootsIterator::ZRootsIterator() :
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    _vm_weak_handles_iter(SystemDictionary::vm_weak_oop_storage()),
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    _jni_handles_iter(JNIHandles::global_handles()),
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    _jni_weak_handles_iter(JNIHandles::weak_global_handles()),
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    _string_table_iter(StringTable::weak_storage()),
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    _universe(this),
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    _object_synchronizer(this),
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    _management(this),
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    _jvmti_export(this),
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    _jvmti_weak_export(this),
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    _jfr_weak(this),
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    _system_dictionary(this),
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    _vm_weak_handles(this),
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    _jni_handles(this),
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    _jni_weak_handles(this),
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    _class_loader_data_graph(this),
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    _threads(this),
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    _code_cache(this),
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    _string_table(this) {
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  assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
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  ZStatTimer timer(ZSubPhasePauseRootsSetup);
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  Threads::change_thread_claim_parity();
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  ClassLoaderDataGraph::clear_claimed_marks();
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  COMPILER2_PRESENT(DerivedPointerTable::clear());
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  CodeCache::gc_prologue();
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  ZNMethodTable::gc_prologue();
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}
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ZRootsIterator::~ZRootsIterator() {
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  ZStatTimer timer(ZSubPhasePauseRootsTeardown);
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  ResourceMark rm;
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  ZNMethodTable::gc_epilogue();
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  CodeCache::gc_epilogue();
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  JvmtiExport::gc_epilogue();
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  COMPILER2_PRESENT(DerivedPointerTable::update_pointers());
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  Threads::assert_all_threads_claimed();
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}
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void ZRootsIterator::do_universe(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsUniverse);
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  Universe::oops_do(cl);
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}
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void ZRootsIterator::do_vm_weak_handles(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsVMWeakHandles);
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  _vm_weak_handles_iter.oops_do(cl);
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}
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void ZRootsIterator::do_jni_handles(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsJNIHandles);
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  _jni_handles_iter.oops_do(cl);
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}
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void ZRootsIterator::do_jni_weak_handles(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsJNIWeakHandles);
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  _jni_weak_handles_iter.oops_do(cl);
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}
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void ZRootsIterator::do_object_synchronizer(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsObjectSynchronizer);
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  ObjectSynchronizer::oops_do(cl);
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}
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void ZRootsIterator::do_management(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsManagement);
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  Management::oops_do(cl);
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}
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void ZRootsIterator::do_jvmti_export(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsJVMTIExport);
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  JvmtiExport::oops_do(cl);
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}
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void ZRootsIterator::do_jvmti_weak_export(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsJVMTIWeakExport);
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  AlwaysTrueClosure always_alive;
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  JvmtiExport::weak_oops_do(&always_alive, cl);
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}
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void ZRootsIterator::do_jfr_weak(OopClosure* cl) {
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#if INCLUDE_JFR
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  ZStatTimer timer(ZSubPhasePauseRootsJFRWeak);
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  AlwaysTrueClosure always_alive;
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  Jfr::weak_oops_do(&always_alive, cl);
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#endif
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}
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void ZRootsIterator::do_system_dictionary(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsSystemDictionary);
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  SystemDictionary::oops_do(cl);
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}
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void ZRootsIterator::do_class_loader_data_graph(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsClassLoaderDataGraph);
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  CLDToOopClosure cld_cl(cl);
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  ClassLoaderDataGraph::cld_do(&cld_cl);
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}
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class ZRootsIteratorThreadClosure : public ThreadClosure {
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private:
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  OopClosure* const _cl;
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public:
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  ZRootsIteratorThreadClosure(OopClosure* cl) :
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      _cl(cl) {}
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  virtual void do_thread(Thread* thread) {
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    if (thread->is_Java_thread()) {
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      // Update thread local adddress bad mask
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      ZThreadLocalData::set_address_bad_mask(thread, ZAddressBadMask);
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    }
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    // Process thread oops
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    thread->oops_do(_cl, NULL);
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  }
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};
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void ZRootsIterator::do_threads(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsThreads);
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  ResourceMark rm;
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  ZRootsIteratorThreadClosure thread_cl(cl);
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  Threads::possibly_parallel_threads_do(true, &thread_cl);
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}
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void ZRootsIterator::do_code_cache(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsCodeCache);
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  ZNMethodTable::oops_do(cl);
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}
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void ZRootsIterator::do_string_table(OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseRootsStringTable);
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  _string_table_iter.oops_do(cl);
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}
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void ZRootsIterator::oops_do(OopClosure* cl, bool visit_jvmti_weak_export) {
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  ZStatTimer timer(ZSubPhasePauseRoots);
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  _universe.oops_do(cl);
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  _object_synchronizer.oops_do(cl);
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  _management.oops_do(cl);
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  _jvmti_export.oops_do(cl);
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  _system_dictionary.oops_do(cl);
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  _jni_handles.oops_do(cl);
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  _class_loader_data_graph.oops_do(cl);
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  _threads.oops_do(cl);
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  _code_cache.oops_do(cl);
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  if (!ZWeakRoots) {
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    _jvmti_weak_export.oops_do(cl);
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    _jfr_weak.oops_do(cl);
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    _vm_weak_handles.oops_do(cl);
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    _jni_weak_handles.oops_do(cl);
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    _string_table.oops_do(cl);
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  } else {
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    if (visit_jvmti_weak_export) {
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      _jvmti_weak_export.oops_do(cl);
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    }
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  }
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}
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ZWeakRootsIterator::ZWeakRootsIterator() :
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    _vm_weak_handles_iter(SystemDictionary::vm_weak_oop_storage()),
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    _jni_weak_handles_iter(JNIHandles::weak_global_handles()),
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    _string_table_iter(StringTable::weak_storage()),
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    _jvmti_weak_export(this),
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    _jfr_weak(this),
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    _vm_weak_handles(this),
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    _jni_weak_handles(this),
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    _symbol_table(this),
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    _string_table(this) {
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  assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
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  ZStatTimer timer(ZSubPhasePauseWeakRootsSetup);
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  SymbolTable::clear_parallel_claimed_index();
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  StringTable::reset_dead_counter();
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}
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ZWeakRootsIterator::~ZWeakRootsIterator() {
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  ZStatTimer timer(ZSubPhasePauseWeakRootsTeardown);
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  StringTable::finish_dead_counter();
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}
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void ZWeakRootsIterator::do_vm_weak_handles(BoolObjectClosure* is_alive, OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseWeakRootsVMWeakHandles);
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  _vm_weak_handles_iter.weak_oops_do(is_alive, cl);
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}
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void ZWeakRootsIterator::do_jni_weak_handles(BoolObjectClosure* is_alive, OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseWeakRootsJNIWeakHandles);
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  _jni_weak_handles_iter.weak_oops_do(is_alive, cl);
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}
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void ZWeakRootsIterator::do_jvmti_weak_export(BoolObjectClosure* is_alive, OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseWeakRootsJVMTIWeakExport);
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  JvmtiExport::weak_oops_do(is_alive, cl);
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}
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void ZWeakRootsIterator::do_jfr_weak(BoolObjectClosure* is_alive, OopClosure* cl) {
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#if INCLUDE_JFR
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  ZStatTimer timer(ZSubPhasePauseWeakRootsJFRWeak);
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  Jfr::weak_oops_do(is_alive, cl);
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#endif
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}
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void ZWeakRootsIterator::do_symbol_table(BoolObjectClosure* is_alive, OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseWeakRootsSymbolTable);
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  int dummy;
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  SymbolTable::possibly_parallel_unlink(&dummy, &dummy);
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}
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class ZStringTableDeadCounterBoolObjectClosure : public BoolObjectClosure  {
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private:
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  BoolObjectClosure* const _cl;
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  size_t                   _ndead;
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public:
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  ZStringTableDeadCounterBoolObjectClosure(BoolObjectClosure* cl) :
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      _cl(cl),
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      _ndead(0) {}
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  ~ZStringTableDeadCounterBoolObjectClosure() {
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    StringTable::inc_dead_counter(_ndead);
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  }
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  virtual bool do_object_b(oop obj) {
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    if (_cl->do_object_b(obj)) {
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      return true;
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    }
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    _ndead++;
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    return false;
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  }
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};
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void ZWeakRootsIterator::do_string_table(BoolObjectClosure* is_alive, OopClosure* cl) {
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  ZStatTimer timer(ZSubPhasePauseWeakRootsStringTable);
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  ZStringTableDeadCounterBoolObjectClosure counter_is_alive(is_alive);
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   373
  _string_table_iter.weak_oops_do(&counter_is_alive, cl);
50525
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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   374
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
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diff changeset
   375
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   376
void ZWeakRootsIterator::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   377
  ZStatTimer timer(ZSubPhasePauseWeakRoots);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   378
  if (ZSymbolTableUnloading) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   379
    _symbol_table.weak_oops_do(is_alive, cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   380
  }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   381
  if (ZWeakRoots) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   382
    _jvmti_weak_export.weak_oops_do(is_alive, cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   383
    _jfr_weak.weak_oops_do(is_alive, cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   384
    if (!ZConcurrentVMWeakHandles) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   385
      _vm_weak_handles.weak_oops_do(is_alive, cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   386
    }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   387
    if (!ZConcurrentJNIWeakGlobalHandles) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   388
      _jni_weak_handles.weak_oops_do(is_alive, cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   389
    }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   390
    if (!ZConcurrentStringTable) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   391
      _string_table.weak_oops_do(is_alive, cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   392
    }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   393
  }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   394
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   395
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   396
void ZWeakRootsIterator::oops_do(OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   397
  AlwaysTrueClosure always_alive;
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   398
  weak_oops_do(&always_alive, cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   399
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   400
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   401
ZConcurrentWeakRootsIterator::ZConcurrentWeakRootsIterator() :
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   402
    _vm_weak_handles_iter(SystemDictionary::vm_weak_oop_storage()),
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   403
    _jni_weak_handles_iter(JNIHandles::weak_global_handles()),
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   404
    _string_table_iter(StringTable::weak_storage()),
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   405
    _vm_weak_handles(this),
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   406
    _jni_weak_handles(this),
50556
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   407
    _string_table(this) {
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   408
  StringTable::reset_dead_counter();
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   409
}
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   410
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   411
ZConcurrentWeakRootsIterator::~ZConcurrentWeakRootsIterator() {
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   412
  StringTable::finish_dead_counter();
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   413
}
50525
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   414
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   415
void ZConcurrentWeakRootsIterator::do_vm_weak_handles(OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   416
  ZStatTimer timer(ZSubPhaseConcurrentWeakRootsVMWeakHandles);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   417
  _vm_weak_handles_iter.oops_do(cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   418
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   419
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   420
void ZConcurrentWeakRootsIterator::do_jni_weak_handles(OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   421
  ZStatTimer timer(ZSubPhaseConcurrentWeakRootsJNIWeakHandles);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   422
  _jni_weak_handles_iter.oops_do(cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   423
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   424
50556
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   425
class ZStringTableDeadCounterOopClosure : public OopClosure  {
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   426
private:
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   427
  OopClosure* const _cl;
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   428
  size_t            _ndead;
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   429
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   430
public:
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   431
  ZStringTableDeadCounterOopClosure(OopClosure* cl) :
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   432
      _cl(cl),
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   433
      _ndead(0) {}
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   434
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   435
  ~ZStringTableDeadCounterOopClosure() {
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   436
    StringTable::inc_dead_counter(_ndead);
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   437
  }
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   438
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   439
  virtual void do_oop(oop* p) {
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   440
    _cl->do_oop(p);
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   441
    if (*p == NULL) {
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   442
      _ndead++;
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   443
    }
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   444
  }
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   445
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   446
  virtual void do_oop(narrowOop* p) {
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   447
    ShouldNotReachHere();
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   448
  }
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   449
};
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   450
50525
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   451
void ZConcurrentWeakRootsIterator::do_string_table(OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   452
  ZStatTimer timer(ZSubPhaseConcurrentWeakRootsStringTable);
50556
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   453
  ZStringTableDeadCounterOopClosure counter_cl(cl);
e5a40146791b 8204613: StringTable: Calculates wrong number of uncleaned items.
rehn
parents: 50525
diff changeset
   454
  _string_table_iter.oops_do(&counter_cl);
50525
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   455
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   456
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   457
void ZConcurrentWeakRootsIterator::oops_do(OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   458
  ZStatTimer timer(ZSubPhaseConcurrentWeakRoots);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   459
  if (ZWeakRoots) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   460
    if (ZConcurrentVMWeakHandles) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   461
      _vm_weak_handles.oops_do(cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   462
    }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   463
    if (ZConcurrentJNIWeakGlobalHandles) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   464
      _jni_weak_handles.oops_do(cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   465
    }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   466
    if (ZConcurrentStringTable) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   467
      _string_table.oops_do(cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   468
    }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   469
  }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   470
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   471
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   472
ZThreadRootsIterator::ZThreadRootsIterator() :
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   473
    _threads(this) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   474
  assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   475
  ZStatTimer timer(ZSubPhasePauseRootsSetup);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   476
  Threads::change_thread_claim_parity();
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   477
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   478
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   479
ZThreadRootsIterator::~ZThreadRootsIterator() {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   480
  ZStatTimer timer(ZSubPhasePauseRootsTeardown);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   481
  Threads::assert_all_threads_claimed();
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   482
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   483
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   484
void ZThreadRootsIterator::do_threads(OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   485
  ZStatTimer timer(ZSubPhasePauseRootsThreads);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   486
  ResourceMark rm;
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   487
  Threads::possibly_parallel_oops_do(true, cl, NULL);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   488
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   489
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   490
void ZThreadRootsIterator::oops_do(OopClosure* cl) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   491
  ZStatTimer timer(ZSubPhasePauseRoots);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   492
  _threads.oops_do(cl);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
   493
}