author | eosterlund |
Tue, 12 Nov 2019 20:01:23 +0000 | |
changeset 59038 | b9a42ca342db |
parent 58705 | f5662bdbee4a |
child 59251 | 4cbfa5077d68 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2019, 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/javaClasses.inline.hpp" |
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#include "gc/shared/referencePolicy.hpp" |
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#include "gc/shared/referenceProcessorStats.hpp" |
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#include "gc/z/zHeap.inline.hpp" |
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#include "gc/z/zOopClosures.inline.hpp" |
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#include "gc/z/zReferenceProcessor.hpp" |
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#include "gc/z/zStat.hpp" |
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#include "gc/z/zTask.hpp" |
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#include "gc/z/zTracer.inline.hpp" |
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#include "gc/z/zUtils.inline.hpp" |
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#include "gc/z/zValue.inline.hpp" |
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#include "memory/universe.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/os.hpp" |
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static const ZStatSubPhase ZSubPhaseConcurrentReferencesProcess("Concurrent References Process"); |
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static const ZStatSubPhase ZSubPhaseConcurrentReferencesEnqueue("Concurrent References Enqueue"); |
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static ReferenceType reference_type(oop reference) { |
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return InstanceKlass::cast(reference->klass())->reference_type(); |
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} |
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static const char* reference_type_name(ReferenceType type) { |
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switch (type) { |
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case REF_SOFT: |
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return "Soft"; |
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case REF_WEAK: |
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return "Weak"; |
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case REF_FINAL: |
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return "Final"; |
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case REF_PHANTOM: |
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return "Phantom"; |
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default: |
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ShouldNotReachHere(); |
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return NULL; |
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} |
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} |
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static volatile oop* reference_referent_addr(oop reference) { |
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return (volatile oop*)java_lang_ref_Reference::referent_addr_raw(reference); |
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} |
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static oop reference_referent(oop reference) { |
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return *reference_referent_addr(reference); |
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} |
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static void reference_set_referent(oop reference, oop referent) { |
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java_lang_ref_Reference::set_referent_raw(reference, referent); |
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} |
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static oop* reference_discovered_addr(oop reference) { |
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return (oop*)java_lang_ref_Reference::discovered_addr_raw(reference); |
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} |
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static oop reference_discovered(oop reference) { |
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return *reference_discovered_addr(reference); |
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} |
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static void reference_set_discovered(oop reference, oop discovered) { |
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java_lang_ref_Reference::set_discovered_raw(reference, discovered); |
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} |
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static oop* reference_next_addr(oop reference) { |
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return (oop*)java_lang_ref_Reference::next_addr_raw(reference); |
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} |
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static oop reference_next(oop reference) { |
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return *reference_next_addr(reference); |
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} |
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static void reference_set_next(oop reference, oop next) { |
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java_lang_ref_Reference::set_next_raw(reference, next); |
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} |
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static void soft_reference_update_clock() { |
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const jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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java_lang_ref_SoftReference::set_clock(now); |
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} |
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ZReferenceProcessor::ZReferenceProcessor(ZWorkers* workers) : |
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_workers(workers), |
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_soft_reference_policy(NULL), |
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_encountered_count(), |
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_discovered_count(), |
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_enqueued_count(), |
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_discovered_list(NULL), |
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_pending_list(NULL), |
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_pending_list_tail(_pending_list.addr()) {} |
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void ZReferenceProcessor::set_soft_reference_policy(bool clear) { |
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static AlwaysClearPolicy always_clear_policy; |
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static LRUMaxHeapPolicy lru_max_heap_policy; |
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if (clear) { |
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log_info(gc, ref)("Clearing All SoftReferences"); |
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_soft_reference_policy = &always_clear_policy; |
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} else { |
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_soft_reference_policy = &lru_max_heap_policy; |
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} |
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_soft_reference_policy->setup(); |
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} |
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bool ZReferenceProcessor::is_inactive(oop reference, oop referent, ReferenceType type) const { |
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if (type == REF_FINAL) { |
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// A FinalReference is inactive if its next field is non-null. An application can't |
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// call enqueue() or clear() on a FinalReference. |
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return reference_next(reference) != NULL; |
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} else { |
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// A non-FinalReference is inactive if the referent is null. The referent can only |
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// be null if the application called Reference.enqueue() or Reference.clear(). |
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return referent == NULL; |
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} |
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} |
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bool ZReferenceProcessor::is_strongly_live(oop referent) const { |
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return ZHeap::heap()->is_object_strongly_live(ZOop::to_address(referent)); |
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} |
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bool ZReferenceProcessor::is_softly_live(oop reference, ReferenceType type) const { |
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if (type != REF_SOFT) { |
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// Not a SoftReference |
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return false; |
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} |
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// Ask SoftReference policy |
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const jlong clock = java_lang_ref_SoftReference::clock(); |
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assert(clock != 0, "Clock not initialized"); |
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assert(_soft_reference_policy != NULL, "Policy not initialized"); |
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return !_soft_reference_policy->should_clear_reference(reference, clock); |
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} |
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bool ZReferenceProcessor::should_discover(oop reference, ReferenceType type) const { |
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volatile oop* const referent_addr = reference_referent_addr(reference); |
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const oop referent = ZBarrier::weak_load_barrier_on_oop_field(referent_addr); |
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if (is_inactive(reference, referent, type)) { |
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return false; |
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} |
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if (is_strongly_live(referent)) { |
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return false; |
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} |
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if (is_softly_live(reference, type)) { |
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return false; |
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} |
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// PhantomReferences with finalizable marked referents should technically not have |
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// to be discovered. However, InstanceRefKlass::oop_oop_iterate_ref_processing() |
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// does not know about the finalizable mark concept, and will therefore mark |
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// referents in non-discovered PhantomReferences as strongly live. To prevent |
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// this, we always discover PhantomReferences with finalizable marked referents. |
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// They will automatically be dropped during the reference processing phase. |
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return true; |
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} |
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bool ZReferenceProcessor::should_drop(oop reference, ReferenceType type) const { |
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// This check is racing with a call to Reference.clear() from the application. |
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// If the application clears the reference after this check it will still end |
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// up on the pending list, and there's nothing we can do about that without |
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// changing the Reference.clear() API. This check is also racing with a call |
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// to Reference.enqueue() from the application, which is unproblematic, since |
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// the application wants the reference to be enqueued anyway. |
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const oop referent = reference_referent(reference); |
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if (referent == NULL) { |
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// Reference has been cleared, by a call to Reference.enqueue() |
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// or Reference.clear() from the application, which means we |
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// should drop the reference. |
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return true; |
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} |
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|
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// Check if the referent is still alive, in which case we should |
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// drop the reference. |
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if (type == REF_PHANTOM) { |
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return ZBarrier::is_alive_barrier_on_phantom_oop(referent); |
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} else { |
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return ZBarrier::is_alive_barrier_on_weak_oop(referent); |
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} |
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} |
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void ZReferenceProcessor::keep_alive(oop reference, ReferenceType type) const { |
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volatile oop* const p = reference_referent_addr(reference); |
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if (type == REF_PHANTOM) { |
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ZBarrier::keep_alive_barrier_on_phantom_oop_field(p); |
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} else { |
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ZBarrier::keep_alive_barrier_on_weak_oop_field(p); |
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} |
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} |
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void ZReferenceProcessor::make_inactive(oop reference, ReferenceType type) const { |
220 |
if (type == REF_FINAL) { |
|
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// Don't clear referent. It is needed by the Finalizer thread to make the call |
|
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// to finalize(). A FinalReference is instead made inactive by self-looping the |
|
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// next field. An application can't call FinalReference.enqueue(), so there is |
|
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// no race to worry about when setting the next field. |
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assert(reference_next(reference) == NULL, "Already inactive"); |
|
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reference_set_next(reference, reference); |
|
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} else { |
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// Clear referent |
|
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reference_set_referent(reference, NULL); |
|
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} |
|
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} |
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||
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void ZReferenceProcessor::discover(oop reference, ReferenceType type) { |
|
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log_trace(gc, ref)("Discovered Reference: " PTR_FORMAT " (%s)", p2i(reference), reference_type_name(type)); |
|
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||
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// Update statistics |
|
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_discovered_count.get()[type]++; |
|
238 |
||
239 |
if (type == REF_FINAL) { |
|
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// Mark referent (and its reachable subgraph) finalizable. This avoids |
|
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// the problem of later having to mark those objects if the referent is |
|
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// still final reachable during processing. |
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volatile oop* const referent_addr = reference_referent_addr(reference); |
|
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ZBarrier::mark_barrier_on_oop_field(referent_addr, true /* finalizable */); |
|
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} |
|
246 |
||
247 |
// Add reference to discovered list |
|
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assert(reference_discovered(reference) == NULL, "Already discovered"); |
|
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oop* const list = _discovered_list.addr(); |
|
250 |
reference_set_discovered(reference, *list); |
|
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*list = reference; |
|
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} |
|
253 |
||
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bool ZReferenceProcessor::discover_reference(oop reference, ReferenceType type) { |
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if (!RegisterReferences) { |
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// Reference processing disabled |
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return false; |
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} |
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log_trace(gc, ref)("Encountered Reference: " PTR_FORMAT " (%s)", p2i(reference), reference_type_name(type)); |
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// Update statistics |
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_encountered_count.get()[type]++; |
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if (!should_discover(reference, type)) { |
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// Not discovered |
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return false; |
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} |
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|
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discover(reference, type); |
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|
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// Discovered |
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return true; |
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} |
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|
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oop ZReferenceProcessor::drop(oop reference, ReferenceType type) { |
277 |
log_trace(gc, ref)("Dropped Reference: " PTR_FORMAT " (%s)", p2i(reference), reference_type_name(type)); |
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|
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// Keep referent alive |
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keep_alive(reference, type); |
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|
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// Unlink and return next in list |
53539 | 283 |
const oop next = reference_discovered(reference); |
284 |
reference_set_discovered(reference, NULL); |
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return next; |
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} |
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|
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oop* ZReferenceProcessor::keep(oop reference, ReferenceType type) { |
289 |
log_trace(gc, ref)("Enqueued Reference: " PTR_FORMAT " (%s)", p2i(reference), reference_type_name(type)); |
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|
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// Update statistics |
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_enqueued_count.get()[type]++; |
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293 |
|
53539 | 294 |
// Make reference inactive |
295 |
make_inactive(reference, type); |
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|
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// Return next in list |
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return reference_discovered_addr(reference); |
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} |
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300 |
|
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void ZReferenceProcessor::work() { |
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// Process discovered references |
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oop* const list = _discovered_list.addr(); |
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oop* p = list; |
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305 |
|
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while (*p != NULL) { |
53539 | 307 |
const oop reference = *p; |
308 |
const ReferenceType type = reference_type(reference); |
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|
53539 | 310 |
if (should_drop(reference, type)) { |
311 |
*p = drop(reference, type); |
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} else { |
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p = keep(reference, type); |
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} |
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} |
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|
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// Prepend discovered references to internal pending list |
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if (*list != NULL) { |
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*p = Atomic::xchg(*list, _pending_list.addr()); |
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if (*p == NULL) { |
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// First to prepend to list, record tail |
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_pending_list_tail = p; |
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} |
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|
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// Clear discovered list |
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*list = NULL; |
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} |
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} |
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329 |
|
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bool ZReferenceProcessor::is_empty() const { |
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ZPerWorkerConstIterator<oop> iter(&_discovered_list); |
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for (const oop* list; iter.next(&list);) { |
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if (*list != NULL) { |
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return false; |
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} |
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} |
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|
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if (_pending_list.get() != NULL) { |
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return false; |
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} |
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|
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return true; |
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} |
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|
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void ZReferenceProcessor::reset_statistics() { |
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assert(is_empty(), "Should be empty"); |
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|
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// Reset encountered |
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ZPerWorkerIterator<Counters> iter_encountered(&_encountered_count); |
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for (Counters* counters; iter_encountered.next(&counters);) { |
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for (int i = REF_SOFT; i <= REF_PHANTOM; i++) { |
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(*counters)[i] = 0; |
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} |
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} |
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|
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// Reset discovered |
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ZPerWorkerIterator<Counters> iter_discovered(&_discovered_count); |
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358 |
for (Counters* counters; iter_discovered.next(&counters);) { |
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|
359 |
for (int i = REF_SOFT; i <= REF_PHANTOM; i++) { |
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(*counters)[i] = 0; |
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|
361 |
} |
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|
362 |
} |
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|
363 |
|
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|
364 |
// Reset enqueued |
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|
365 |
ZPerWorkerIterator<Counters> iter_enqueued(&_enqueued_count); |
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|
366 |
for (Counters* counters; iter_enqueued.next(&counters);) { |
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|
367 |
for (int i = REF_SOFT; i <= REF_PHANTOM; i++) { |
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368 |
(*counters)[i] = 0; |
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|
369 |
} |
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|
370 |
} |
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|
371 |
} |
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|
372 |
|
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|
373 |
void ZReferenceProcessor::collect_statistics() { |
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374 |
Counters encountered = {}; |
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375 |
Counters discovered = {}; |
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Counters enqueued = {}; |
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|
377 |
|
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|
378 |
// Sum encountered |
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|
379 |
ZPerWorkerConstIterator<Counters> iter_encountered(&_encountered_count); |
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|
380 |
for (const Counters* counters; iter_encountered.next(&counters);) { |
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|
381 |
for (int i = REF_SOFT; i <= REF_PHANTOM; i++) { |
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|
382 |
encountered[i] += (*counters)[i]; |
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|
383 |
} |
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|
384 |
} |
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|
385 |
|
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|
386 |
// Sum discovered |
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|
387 |
ZPerWorkerConstIterator<Counters> iter_discovered(&_discovered_count); |
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|
388 |
for (const Counters* counters; iter_discovered.next(&counters);) { |
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|
389 |
for (int i = REF_SOFT; i <= REF_PHANTOM; i++) { |
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|
390 |
discovered[i] += (*counters)[i]; |
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|
391 |
} |
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|
392 |
} |
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|
393 |
|
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|
394 |
// Sum enqueued |
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|
395 |
ZPerWorkerConstIterator<Counters> iter_enqueued(&_enqueued_count); |
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|
396 |
for (const Counters* counters; iter_enqueued.next(&counters);) { |
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|
397 |
for (int i = REF_SOFT; i <= REF_PHANTOM; i++) { |
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|
398 |
enqueued[i] += (*counters)[i]; |
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|
399 |
} |
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|
400 |
} |
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|
401 |
|
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|
402 |
// Update statistics |
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|
403 |
ZStatReferences::set_soft(encountered[REF_SOFT], discovered[REF_SOFT], enqueued[REF_SOFT]); |
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|
404 |
ZStatReferences::set_weak(encountered[REF_WEAK], discovered[REF_WEAK], enqueued[REF_WEAK]); |
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|
405 |
ZStatReferences::set_final(encountered[REF_FINAL], discovered[REF_FINAL], enqueued[REF_FINAL]); |
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|
406 |
ZStatReferences::set_phantom(encountered[REF_PHANTOM], discovered[REF_PHANTOM], enqueued[REF_PHANTOM]); |
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|
407 |
|
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|
408 |
// Trace statistics |
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409 |
const ReferenceProcessorStats stats(discovered[REF_SOFT], |
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|
410 |
discovered[REF_WEAK], |
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|
411 |
discovered[REF_FINAL], |
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|
412 |
discovered[REF_PHANTOM]); |
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|
413 |
ZTracer::tracer()->report_gc_reference_stats(stats); |
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|
414 |
} |
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|
415 |
|
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|
416 |
class ZReferenceProcessorTask : public ZTask { |
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417 |
private: |
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|
418 |
ZReferenceProcessor* const _reference_processor; |
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|
419 |
|
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|
420 |
public: |
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|
421 |
ZReferenceProcessorTask(ZReferenceProcessor* reference_processor) : |
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|
422 |
ZTask("ZReferenceProcessorTask"), |
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|
423 |
_reference_processor(reference_processor) {} |
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|
424 |
|
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|
425 |
virtual void work() { |
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|
426 |
_reference_processor->work(); |
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|
427 |
} |
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|
428 |
}; |
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|
429 |
|
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|
430 |
void ZReferenceProcessor::process_references() { |
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|
431 |
ZStatTimer timer(ZSubPhaseConcurrentReferencesProcess); |
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|
432 |
|
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|
433 |
// Process discovered lists |
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|
434 |
ZReferenceProcessorTask task(this); |
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|
435 |
_workers->run_concurrent(&task); |
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|
436 |
|
53539 | 437 |
// Update SoftReference clock |
438 |
soft_reference_update_clock(); |
|
50525
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|
439 |
|
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|
440 |
// Collect, log and trace statistics |
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|
441 |
collect_statistics(); |
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|
442 |
} |
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|
443 |
|
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|
444 |
void ZReferenceProcessor::enqueue_references() { |
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|
445 |
ZStatTimer timer(ZSubPhaseConcurrentReferencesEnqueue); |
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|
446 |
|
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|
447 |
if (_pending_list.get() == NULL) { |
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|
448 |
// Nothing to enqueue |
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|
449 |
return; |
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|
450 |
} |
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|
451 |
|
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|
452 |
{ |
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|
453 |
// Heap_lock protects external pending list |
54623
1126f0607c70
8222811: Consolidate MutexLockerEx and MutexLocker
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|
454 |
MonitorLocker ml(Heap_lock); |
50525
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|
455 |
|
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|
456 |
// Prepend internal pending list to external pending list |
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|
457 |
*_pending_list_tail = Universe::swap_reference_pending_list(_pending_list.get()); |
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|
458 |
|
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|
459 |
// Notify ReferenceHandler thread |
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|
460 |
ml.notify_all(); |
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|
461 |
} |
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|
462 |
|
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|
463 |
// Reset internal pending list |
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|
464 |
_pending_list.set(NULL); |
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|
465 |
_pending_list_tail = _pending_list.addr(); |
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|
466 |
} |