1 /*
2 * Copyright (c) 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_G1MEASUREMENTS_HPP
26 #define SHARE_VM_GC_G1_G1MEASUREMENTS_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/globalDefinitions.hpp"
30
31 class TruncatedSeq;
32 class G1Predictions;
33
34 class G1Analytics: public CHeapObj<mtGC> {
35 const static int TruncatedSeqLength = 10;
36 const static int NumPrevPausesForHeuristics = 10;
37 const G1Predictions* _predictor;
38
39 // These exclude marking times.
40 TruncatedSeq* _recent_gc_times_ms;
41
42 TruncatedSeq* _concurrent_mark_remark_times_ms;
43 TruncatedSeq* _concurrent_mark_cleanup_times_ms;
44
45 TruncatedSeq* _alloc_rate_ms_seq;
46 double _prev_collection_pause_end_ms;
47
48 TruncatedSeq* _rs_length_diff_seq;
49 TruncatedSeq* _cost_per_card_ms_seq;
50 TruncatedSeq* _cost_scan_hcc_seq;
51 TruncatedSeq* _young_cards_per_entry_ratio_seq;
52 TruncatedSeq* _mixed_cards_per_entry_ratio_seq;
53 TruncatedSeq* _cost_per_entry_ms_seq;
54 TruncatedSeq* _mixed_cost_per_entry_ms_seq;
55 TruncatedSeq* _cost_per_byte_ms_seq;
56 TruncatedSeq* _constant_other_time_ms_seq;
57 TruncatedSeq* _young_other_cost_per_region_ms_seq;
58 TruncatedSeq* _non_young_other_cost_per_region_ms_seq;
59
60 TruncatedSeq* _pending_cards_seq;
61 TruncatedSeq* _rs_lengths_seq;
62
63 TruncatedSeq* _cost_per_byte_ms_during_cm_seq;
64
65 // Statistics kept per GC stoppage, pause or full.
66 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec;
67
68 // The ratio of gc time to elapsed time, computed over recent pauses,
69 // and the ratio for just the last pause.
70 double _recent_avg_pause_time_ratio;
71 double _last_pause_time_ratio;
72
73 double get_new_prediction(TruncatedSeq const* seq) const;
74 size_t get_new_size_prediction(TruncatedSeq const* seq) const;
75
76 public:
77 G1Analytics(const G1Predictions* predictor);
78
79 double prev_collection_pause_end_ms() const {
80 return _prev_collection_pause_end_ms;
81 }
82
83 double recent_avg_pause_time_ratio() const {
84 return _recent_avg_pause_time_ratio;
85 }
86
87 double last_pause_time_ratio() const {
88 return _last_pause_time_ratio;
89 }
90
91 uint number_of_recorded_pause_times() const {
92 return NumPrevPausesForHeuristics;
93 }
94
95 void append_prev_collection_pause_end_ms(double ms) {
96 _prev_collection_pause_end_ms += ms;
97 }
98
99 void report_concurrent_mark_remark_times_ms(double ms);
100 void report_concurrent_mark_cleanup_times_ms(double ms);
101 void report_alloc_rate_ms(double alloc_rate);
102 void report_cost_per_card_ms(double cost_per_card_ms);
103 void report_cost_scan_hcc(double cost_scan_hcc);
104 void report_cost_per_entry_ms(double cost_per_entry_ms, bool last_gc_was_young);
105 void report_cards_per_entry_ratio(double cards_per_entry_ratio, bool last_gc_was_young);
106 void report_rs_length_diff(double rs_length_diff);
107 void report_cost_per_byte_ms(double cost_per_byte_ms, bool in_marking_window);
108 void report_young_other_cost_per_region_ms(double other_cost_per_region_ms);
109 void report_non_young_other_cost_per_region_ms(double other_cost_per_region_ms);
110 void report_constant_other_time_ms(double constant_other_time_ms);
111 void report_pending_cards(double pending_cards);
112 void report_rs_lengths(double rs_lengths);
113
114 size_t predict_rs_length_diff() const;
115
116 double predict_alloc_rate_ms() const;
117 int num_alloc_rate_ms() const;
118
119 double predict_cost_per_card_ms() const;
120
121 double predict_scan_hcc_ms() const;
122
123 double predict_rs_update_time_ms(size_t pending_cards) const;
124
125 double predict_young_cards_per_entry_ratio() const;
126
127 double predict_mixed_cards_per_entry_ratio() const;
128
129 size_t predict_card_num(size_t rs_length, bool gcs_are_young) const;
130
131 double predict_rs_scan_time_ms(size_t card_num, bool gcs_are_young) const;
132
133 double predict_mixed_rs_scan_time_ms(size_t card_num) const;
134
135 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) const;
136
137 double predict_object_copy_time_ms(size_t bytes_to_copy, bool during_concurrent_mark) const;
138
139 double predict_constant_other_time_ms() const;
140
141 double predict_young_other_time_ms(size_t young_num) const;
142
143 double predict_non_young_other_time_ms(size_t non_young_num) const;
144
145 double predict_remark_time_ms() const;
146
147 double predict_cleanup_time_ms() const;
148
149 size_t predict_rs_lengths() const;
150 size_t predict_pending_cards() const;
151
152 // Add a new GC of the given duration and end time to the record.
153 void update_recent_gc_times(double end_time_sec, double elapsed_ms);
154 void compute_pause_time_ratio(double interval_ms, double pause_time_ms);
155
156 double last_known_gc_end_time_sec() const;
157 };
158
159 #endif // SHARE_VM_GC_G1_G1MEASUREMENTS_HPP