1/*
2 * Copyright (c) 2017, 2019, 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 "classfile/classLoaderDataGraph.hpp"
27#include "gc/g1/g1CollectedHeap.hpp"
28#include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
29#include "gc/g1/g1FullCollector.hpp"
30#include "gc/g1/g1FullGCAdjustTask.hpp"
31#include "gc/g1/g1FullGCCompactionPoint.hpp"
32#include "gc/g1/g1FullGCMarker.hpp"
33#include "gc/g1/g1FullGCOopClosures.inline.hpp"
34#include "gc/g1/heapRegion.inline.hpp"
35#include "gc/shared/gcTraceTime.inline.hpp"
36#include "gc/shared/referenceProcessor.hpp"
37#include "gc/shared/weakProcessor.inline.hpp"
38#include "logging/log.hpp"
39#include "memory/iterator.inline.hpp"
40#include "runtime/atomic.hpp"
41
42class G1AdjustLiveClosure : public StackObj {
43 G1AdjustClosure* _adjust_closure;
44public:
45 G1AdjustLiveClosure(G1AdjustClosure* cl) :
46 _adjust_closure(cl) { }
47
48 size_t apply(oop object) {
49 return object->oop_iterate_size(_adjust_closure);
50 }
51};
52
53class G1AdjustRegionClosure : public HeapRegionClosure {
54 G1CMBitMap* _bitmap;
55 uint _worker_id;
56 public:
57 G1AdjustRegionClosure(G1CMBitMap* bitmap, uint worker_id) :
58 _bitmap(bitmap),
59 _worker_id(worker_id) { }
60
61 bool do_heap_region(HeapRegion* r) {
62 G1AdjustClosure cl;
63 if (r->is_humongous()) {
64 oop obj = oop(r->humongous_start_region()->bottom());
65 obj->oop_iterate(&cl, MemRegion(r->bottom(), r->top()));
66 } else if (r->is_open_archive()) {
67 // Only adjust the open archive regions, the closed ones
68 // never change.
69 G1AdjustLiveClosure adjust(&cl);
70 r->apply_to_marked_objects(_bitmap, &adjust);
71 // Open archive regions will not be compacted and the marking information is
72 // no longer needed. Clear it here to avoid having to do it later.
73 _bitmap->clear_region(r);
74 } else {
75 G1AdjustLiveClosure adjust(&cl);
76 r->apply_to_marked_objects(_bitmap, &adjust);
77 }
78 return false;
79 }
80};
81
82G1FullGCAdjustTask::G1FullGCAdjustTask(G1FullCollector* collector) :
83 G1FullGCTask("G1 Adjust", collector),
84 _root_processor(G1CollectedHeap::heap(), collector->workers()),
85 _references_done(0),
86 _weak_proc_task(collector->workers()),
87 _hrclaimer(collector->workers()),
88 _adjust(),
89 _string_dedup_cleaning_task(NULL, &_adjust, false) {
90 // Need cleared claim bits for the roots processing
91 ClassLoaderDataGraph::clear_claimed_marks();
92}
93
94void G1FullGCAdjustTask::work(uint worker_id) {
95 Ticks start = Ticks::now();
96 ResourceMark rm;
97
98 // Adjust preserved marks first since they are not balanced.
99 G1FullGCMarker* marker = collector()->marker(worker_id);
100 marker->preserved_stack()->adjust_during_full_gc();
101
102 // Adjust the weak roots.
103
104 if (Atomic::add(1u, &_references_done) == 1u) { // First incr claims task.
105 G1CollectedHeap::heap()->ref_processor_stw()->weak_oops_do(&_adjust);
106 }
107
108 AlwaysTrueClosure always_alive;
109 _weak_proc_task.work(worker_id, &always_alive, &_adjust);
110
111 CLDToOopClosure adjust_cld(&_adjust, ClassLoaderData::_claim_strong);
112 CodeBlobToOopClosure adjust_code(&_adjust, CodeBlobToOopClosure::FixRelocations);
113 _root_processor.process_all_roots(&_adjust, &adjust_cld, &adjust_code);
114
115 // Adjust string dedup data structures.
116 _string_dedup_cleaning_task.work(worker_id);
117
118 // Now adjust pointers region by region
119 G1AdjustRegionClosure blk(collector()->mark_bitmap(), worker_id);
120 G1CollectedHeap::heap()->heap_region_par_iterate_from_worker_offset(&blk, &_hrclaimer, worker_id);
121 log_task("Adjust task", worker_id, start);
122}
123