161333eeba
Reviewed-by: dholmes
90 lines
3.5 KiB
C++
90 lines
3.5 KiB
C++
/*
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* Copyright (c) 2014, 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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*/
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#include "precompiled.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1GCPhaseTimes.hpp"
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#include "gc/g1/g1StringDedup.hpp"
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#include "gc/g1/g1StringDedupQueue.hpp"
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#include "gc/g1/g1StringDedupStat.hpp"
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#include "gc/shared/stringdedup/stringDedup.inline.hpp"
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#include "gc/shared/stringdedup/stringDedupQueue.hpp"
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#include "gc/shared/stringdedup/stringDedupTable.hpp"
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#include "gc/shared/stringdedup/stringDedupThread.inline.hpp"
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#include "oops/oop.inline.hpp"
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void G1StringDedup::initialize() {
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assert(UseG1GC, "String deduplication available with G1");
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StringDedup::initialize_impl<G1StringDedupQueue, G1StringDedupStat>();
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}
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bool G1StringDedup::is_candidate_from_mark(oop obj) {
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if (java_lang_String::is_instance_inlined(obj)) {
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bool from_young = G1CollectedHeap::heap()->heap_region_containing(obj)->is_young();
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if (from_young && obj->age() < StringDeduplicationAgeThreshold) {
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// Candidate found. String is being evacuated from young to old but has not
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// reached the deduplication age threshold, i.e. has not previously been a
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// candidate during its life in the young generation.
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return true;
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}
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}
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// Not a candidate
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return false;
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}
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void G1StringDedup::enqueue_from_mark(oop java_string, uint worker_id) {
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assert(is_enabled(), "String deduplication not enabled");
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if (is_candidate_from_mark(java_string)) {
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G1StringDedupQueue::push(worker_id, java_string);
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}
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}
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bool G1StringDedup::is_candidate_from_evacuation(bool from_young, bool to_young, oop obj) {
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if (from_young && java_lang_String::is_instance_inlined(obj)) {
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if (to_young && obj->age() == StringDeduplicationAgeThreshold) {
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// Candidate found. String is being evacuated from young to young and just
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// reached the deduplication age threshold.
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return true;
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}
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if (!to_young && obj->age() < StringDeduplicationAgeThreshold) {
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// Candidate found. String is being evacuated from young to old but has not
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// reached the deduplication age threshold, i.e. has not previously been a
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// candidate during its life in the young generation.
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return true;
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}
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}
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// Not a candidate
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return false;
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}
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void G1StringDedup::enqueue_from_evacuation(bool from_young, bool to_young, uint worker_id, oop java_string) {
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assert(is_enabled(), "String deduplication not enabled");
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if (is_candidate_from_evacuation(from_young, to_young, java_string)) {
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G1StringDedupQueue::push(worker_id, java_string);
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}
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}
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