a060be188d
Co-authored-by: Markus Gronlund <markus.gronlund@oracle.com> Reviewed-by: coleenp, ihse, erikj, dsamersoff, mseledtsov, egahlin, mgronlun
113 lines
4.0 KiB
C++
113 lines
4.0 KiB
C++
/*
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* Copyright (c) 2017, 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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*/
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#include "precompiled.hpp"
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#include "gc/g1/g1CollectedHeap.hpp"
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#include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
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#include "gc/g1/g1FullCollector.hpp"
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#include "gc/g1/g1FullGCCompactionPoint.hpp"
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#include "gc/g1/g1FullGCCompactTask.hpp"
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#include "gc/g1/heapRegion.inline.hpp"
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#include "gc/shared/gcTraceTime.inline.hpp"
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#include "logging/log.hpp"
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#include "oops/oop.inline.hpp"
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#include "utilities/ticks.hpp"
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class G1ResetHumongousClosure : public HeapRegionClosure {
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G1CMBitMap* _bitmap;
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public:
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G1ResetHumongousClosure(G1CMBitMap* bitmap) :
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_bitmap(bitmap) { }
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bool do_heap_region(HeapRegion* current) {
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if (current->is_humongous()) {
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if (current->is_starts_humongous()) {
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oop obj = oop(current->bottom());
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if (_bitmap->is_marked(obj)) {
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// Clear bitmap and fix mark word.
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_bitmap->clear(obj);
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obj->init_mark_raw();
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} else {
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assert(current->is_empty(), "Should have been cleared in phase 2.");
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}
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}
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current->reset_during_compaction();
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}
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return false;
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}
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};
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size_t G1FullGCCompactTask::G1CompactRegionClosure::apply(oop obj) {
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size_t size = obj->size();
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HeapWord* destination = (HeapWord*)obj->forwardee();
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if (destination == NULL) {
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// Object not moving
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return size;
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}
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// copy object and reinit its mark
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HeapWord* obj_addr = (HeapWord*) obj;
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assert(obj_addr != destination, "everything in this pass should be moving");
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Copy::aligned_conjoint_words(obj_addr, destination, size);
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oop(destination)->init_mark_raw();
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assert(oop(destination)->klass() != NULL, "should have a class");
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return size;
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}
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void G1FullGCCompactTask::compact_region(HeapRegion* hr) {
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assert(!hr->is_humongous(), "Should be no humongous regions in compaction queue");
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G1CompactRegionClosure compact(collector()->mark_bitmap());
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hr->apply_to_marked_objects(collector()->mark_bitmap(), &compact);
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// Once all objects have been moved the liveness information
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// needs be cleared.
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collector()->mark_bitmap()->clear_region(hr);
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hr->complete_compaction();
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}
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void G1FullGCCompactTask::work(uint worker_id) {
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Ticks start = Ticks::now();
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GrowableArray<HeapRegion*>* compaction_queue = collector()->compaction_point(worker_id)->regions();
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for (GrowableArrayIterator<HeapRegion*> it = compaction_queue->begin();
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it != compaction_queue->end();
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++it) {
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compact_region(*it);
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}
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G1ResetHumongousClosure hc(collector()->mark_bitmap());
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G1CollectedHeap::heap()->heap_region_par_iterate_from_worker_offset(&hc, &_claimer, worker_id);
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log_task("Compaction task", worker_id, start);
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}
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void G1FullGCCompactTask::serial_compaction() {
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GCTraceTime(Debug, gc, phases) tm("Phase 4: Serial Compaction", collector()->scope()->timer());
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GrowableArray<HeapRegion*>* compaction_queue = collector()->serial_compaction_point()->regions();
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for (GrowableArrayIterator<HeapRegion*> it = compaction_queue->begin();
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it != compaction_queue->end();
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++it) {
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compact_region(*it);
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}
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}
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