1 /*
2 * Copyright (c) 2002, 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/systemDictionary.hpp"
27 #include "code/codeCache.hpp"
28 #include "gc/parallel/gcTaskManager.hpp"
29 #include "gc/parallel/parallelScavengeHeap.inline.hpp"
30 #include "gc/parallel/psCardTable.hpp"
31 #include "gc/parallel/psClosure.inline.hpp"
32 #include "gc/parallel/psPromotionManager.hpp"
33 #include "gc/parallel/psPromotionManager.inline.hpp"
34 #include "gc/parallel/psScavenge.inline.hpp"
35 #include "gc/parallel/psTasks.hpp"
36 #include "gc/shared/taskqueue.inline.hpp"
37 #include "memory/iterator.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "memory/universe.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "runtime/thread.hpp"
42 #include "runtime/vmThread.hpp"
43 #include "services/management.hpp"
44
45 //
46 // StealTask
47 //
48
49 StealTask::StealTask(ParallelTaskTerminator* t) :
50 _terminator(t) {}
51
52 void StealTask::do_it(GCTaskManager* manager, uint which) {
53 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
54
55 PSPromotionManager* pm =
56 PSPromotionManager::gc_thread_promotion_manager(which);
57 pm->drain_stacks(true);
58 guarantee(pm->stacks_empty(),
59 "stacks should be empty at this point");
60
61 while(true) {
62 StarTask p;
63 if (PSPromotionManager::steal_depth(which, p)) {
64 TASKQUEUE_STATS_ONLY(pm->record_steal(p));
65 pm->process_popped_location_depth(p);
66 pm->drain_stacks_depth(true);
67 } else {
68 if (terminator()->offer_termination()) {
69 break;
70 }
71 }
72 }
73 guarantee(pm->stacks_empty(), "stacks should be empty at this point");
74 }