1 /*
  2  * Copyright (c) 2017, 2023, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "gc/g1/g1CollectedHeap.inline.hpp"
 27 #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
 28 #include "gc/g1/g1FullCollector.inline.hpp"
 29 #include "gc/g1/g1FullGCCompactionPoint.hpp"
 30 #include "gc/g1/g1FullGCMarker.hpp"
 31 #include "gc/g1/g1FullGCOopClosures.inline.hpp"
 32 #include "gc/g1/g1FullGCPrepareTask.inline.hpp"
 33 #include "gc/g1/heapRegion.inline.hpp"
 34 #include "gc/shared/gcTraceTime.inline.hpp"
 35 #include "gc/shared/referenceProcessor.hpp"
 36 #include "logging/log.hpp"
 37 #include "memory/iterator.inline.hpp"
 38 #include "oops/oop.inline.hpp"
 39 #include "utilities/ticks.hpp"
 40 
 41 G1DetermineCompactionQueueClosure::G1DetermineCompactionQueueClosure(G1FullCollector* collector) :
 42   _g1h(G1CollectedHeap::heap()),
 43   _collector(collector),
 44   _cur_worker(0) { }
 45 
 46 bool G1FullGCPrepareTask::G1CalculatePointersClosure::do_heap_region(HeapRegion* hr) {
 47   uint region_idx = hr->hrm_index();
 48   assert(_collector->is_compaction_target(region_idx), "must be");
 49 
 50   assert(!hr->is_pinned(), "must be");
 51   assert(!hr->is_closed_archive(), "must be");
 52   assert(!hr->is_open_archive(), "must be");
 53 
 54   prepare_for_compaction(hr);
 55 
 56   return false;
 57 }
 58 
 59 G1FullGCPrepareTask::G1FullGCPrepareTask(G1FullCollector* collector) :
 60     G1FullGCTask("G1 Prepare Compact Task", collector),
 61     _has_free_compaction_targets(false),
 62     _hrclaimer(collector->workers()) {
 63 }
 64 
 65 void G1FullGCPrepareTask::set_has_free_compaction_targets() {
 66   if (!_has_free_compaction_targets) {
 67     _has_free_compaction_targets = true;
 68   }
 69 }
 70 
 71 bool G1FullGCPrepareTask::has_free_compaction_targets() {
 72   return _has_free_compaction_targets;
 73 }
 74 
 75 void G1FullGCPrepareTask::work(uint worker_id) {
 76   Ticks start = Ticks::now();
 77   // Calculate the target locations for the objects in the non-free regions of
 78   // the compaction queues provided by the associate compaction point.
 79   {
 80     G1FullGCCompactionPoint* compaction_point = collector()->compaction_point(worker_id);
 81     G1CalculatePointersClosure closure(collector(), compaction_point);
 82 
 83     for (GrowableArrayIterator<HeapRegion*> it = compaction_point->regions()->begin();
 84          it != compaction_point->regions()->end();
 85          ++it) {
 86       closure.do_heap_region(*it);
 87     }
 88     compaction_point->update();
 89     // Determine if there are any unused compaction targets. This is only the case if
 90     // there are
 91     // - any regions in queue, so no free ones either.
 92     // - and the current region is not the last one in the list.
 93     if (compaction_point->has_regions() &&
 94         compaction_point->current_region() != compaction_point->regions()->last()) {
 95       set_has_free_compaction_targets();
 96     }
 97   }
 98   log_task("Prepare compaction task", worker_id, start);
 99 }
100 
101 G1FullGCPrepareTask::G1CalculatePointersClosure::G1CalculatePointersClosure(G1FullCollector* collector,
102                                                                             G1FullGCCompactionPoint* cp) :
103   _g1h(G1CollectedHeap::heap()),
104   _collector(collector),
105   _bitmap(collector->mark_bitmap()),
106   _cp(cp) { }
107 
108 
109 G1FullGCPrepareTask::G1PrepareCompactLiveClosure::G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp) :
110     _cp(cp) { }
111 
112 size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosure::apply(oop object) {
113   size_t size = object->size();
114   _cp->forward(object, size);
115   return size;
116 }
117 
118 void G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_compaction(HeapRegion* hr) {
119   if (!_collector->is_free(hr->hrm_index())) {
120     G1PrepareCompactLiveClosure prepare_compact(_cp);
121     hr->apply_to_marked_objects(_bitmap, &prepare_compact);
122   }
123 }