1 /*
2 * Copyright (c) 2001, 2016, 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 #ifndef SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP
26 #define SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP
27
28 #include "gc/shared/concurrentGCThread.hpp"
29
30 // The Concurrent Mark GC Thread triggers the parallel G1CMConcurrentMarkingTasks
31 // as well as handling various marking cleanup.
32
33 class G1ConcurrentMark;
34 class G1Policy;
35
36 class ConcurrentMarkThread: public ConcurrentGCThread {
37 friend class VMStructs;
38
39 double _vtime_start; // Initial virtual time.
40 double _vtime_accum; // Accumulated virtual time.
41 double _vtime_mark_accum;
42
43 G1ConcurrentMark* _cm;
44
45 enum State {
46 Idle,
47 Started,
48 InProgress
49 };
50
51 volatile State _state;
52
53 void sleepBeforeNextCycle();
54 void delay_to_keep_mmu(G1Policy* g1_policy, bool remark);
55
56 void run_service();
57 void stop_service();
58
59 public:
60 // Constructor
61 ConcurrentMarkThread(G1ConcurrentMark* cm);
62
63 // Total virtual time so far for this thread and concurrent marking tasks.
64 double vtime_accum();
65 // Marking virtual time so far this thread and concurrent marking tasks.
66 double vtime_mark_accum();
67
68 G1ConcurrentMark* cm() { return _cm; }
69
70 void set_idle() { assert(_state != Started, "must not be starting a new cycle"); _state = Idle; }
71 bool idle() { return _state == Idle; }
72 void set_started() { assert(_state == Idle, "cycle in progress"); _state = Started; }
73 bool started() { return _state == Started; }
74 void set_in_progress() { assert(_state == Started, "must be starting a cycle"); _state = InProgress; }
75 bool in_progress() { return _state == InProgress; }
76
77 // Returns true from the moment a marking cycle is
78 // initiated (during the initial-mark pause when started() is set)
79 // to the moment when the cycle completes (just after the next
80 // marking bitmap has been cleared and in_progress() is
81 // cleared). While during_cycle() is true we will not start another cycle
82 // so that cycles do not overlap. We cannot use just in_progress()
83 // as the CM thread might take some time to wake up before noticing
84 // that started() is set and set in_progress().
85 bool during_cycle() { return !idle(); }
86 };
87
88 #endif // SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP
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1 /*
2 * Copyright (c) 2001, 2017, 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 #ifndef SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP
26 #define SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP
27
28 #include "gc/shared/concurrentGCPhaseManager.hpp"
29 #include "gc/shared/concurrentGCThread.hpp"
30
31 // The Concurrent Mark GC Thread triggers the parallel G1CMConcurrentMarkingTasks
32 // as well as handling various marking cleanup.
33
34 class G1ConcurrentMark;
35 class G1Policy;
36
37 class ConcurrentMarkThread: public ConcurrentGCThread {
38 friend class VMStructs;
39
40 double _vtime_start; // Initial virtual time.
41 double _vtime_accum; // Accumulated virtual time.
42 double _vtime_mark_accum;
43
44 G1ConcurrentMark* _cm;
45
46 enum State {
47 Idle,
48 Started,
49 InProgress
50 };
51
52 volatile State _state;
53
54 // WhiteBox testing support.
55 ConcurrentGCPhaseManager::Stack _phase_manager_stack;
56
57 void sleepBeforeNextCycle();
58 void delay_to_keep_mmu(G1Policy* g1_policy, bool remark);
59
60 void run_service();
61 void stop_service();
62
63 public:
64 // Constructor
65 ConcurrentMarkThread(G1ConcurrentMark* cm);
66
67 // Total virtual time so far for this thread and concurrent marking tasks.
68 double vtime_accum();
69 // Marking virtual time so far this thread and concurrent marking tasks.
70 double vtime_mark_accum();
71
72 G1ConcurrentMark* cm() { return _cm; }
73
74 void set_idle() { assert(_state != Started, "must not be starting a new cycle"); _state = Idle; }
75 bool idle() { return _state == Idle; }
76 void set_started() { assert(_state == Idle, "cycle in progress"); _state = Started; }
77 bool started() { return _state == Started; }
78 void set_in_progress() { assert(_state == Started, "must be starting a cycle"); _state = InProgress; }
79 bool in_progress() { return _state == InProgress; }
80
81 // Returns true from the moment a marking cycle is
82 // initiated (during the initial-mark pause when started() is set)
83 // to the moment when the cycle completes (just after the next
84 // marking bitmap has been cleared and in_progress() is
85 // cleared). While during_cycle() is true we will not start another cycle
86 // so that cycles do not overlap. We cannot use just in_progress()
87 // as the CM thread might take some time to wake up before noticing
88 // that started() is set and set in_progress().
89 bool during_cycle() { return !idle(); }
90
91 // WhiteBox testing support.
92 const char* const* concurrent_phases() const;
93 bool request_concurrent_phase(const char* phase);
94
95 ConcurrentGCPhaseManager::Stack* phase_manager_stack() {
96 return &_phase_manager_stack;
97 }
98 };
99
100 #endif // SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP
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